use argon2::{password_hash::{PasswordHash, PasswordHasher, PasswordVerifier, SaltString}, Argon2};
use axum::{extract::{Path as AxumPath, State}, http::{HeaderMap, StatusCode}, response::Redirect, Json};
use chrono::{Duration, Utc};
use lettre::{
    message::{header::ContentType, Mailbox, MultiPart, SinglePart},
    transport::smtp::authentication::Credentials,
    AsyncSmtpTransport, AsyncTransport, Message, Tokio1Executor,
};
use rand_core::{OsRng, RngCore};
use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256};
use sqlx::FromRow;
use tracing::{debug, info, warn};

use crate::{queries, state::{SharedState, SmtpConfig}};

const MIN_PASSWORD: usize = 8;
const MAX_PASSWORD: usize = 128;
const MAX_NICKNAME: usize = 40;

#[derive(Debug, Clone, FromRow)]
pub struct User {
    pub id: i64, pub nickname: String, pub email: String, pub password_hash: String, pub confirmed_at: Option<String>
}

#[derive(Deserialize)] pub struct IdentityRequest {
    nickname: String, #[serde(default)] session_token: Option<String>
}
#[derive(Deserialize)] pub struct RegisterRequest {
    nickname: String, email: String, password: String
}
#[derive(Deserialize)] pub struct LoginRequest { email: String, password: String }
#[derive(Deserialize)] pub struct ConfirmAccountRequest { token: String }
#[derive(Deserialize)] pub struct ResetRequest { email: String }
#[derive(Deserialize)] pub struct ResetConfirmRequest { token: String, password: String }
#[derive(Deserialize)] pub struct ResourceActionRequest {
    kind: String, slug: String, #[serde(default)] password: Option<String>
}
#[derive(Serialize, FromRow)] pub struct ResourceItem {
    slug: String, title: String, protected: i64, updated_at: String, #[sqlx(rename = "private")]
    #[serde(rename = "private")]
    private_resource: i64, owned: i64, permission: String, shared_by: String
}

#[derive(Deserialize)] pub struct PrivacyRequest { kind: String, slug: String, private: bool }
#[derive(Deserialize)] pub struct ShareUsersRequest { kind: String, slug: String, emails: String, permission: String }
#[derive(Deserialize)] pub struct RemoveShareRequest { kind: String, slug: String, email: String }
#[derive(Deserialize)] pub struct CreateShareLinkRequest { kind: String, slug: String, permission: String, expires_at: Option<String> }
#[derive(Deserialize)] pub struct UpdateShareLinkRequest { kind: String, slug: String, token: String, permission: String, expires_at: Option<String> }
#[derive(Deserialize)] pub struct RevokeShareLinkRequest { kind: String, slug: String, token: String }

#[derive(Serialize)] pub struct ResourceList {
    workspaces: Vec<ResourceItem>, pads: Vec<ResourceItem>
}
#[derive(Serialize)] pub struct SessionResponse {
    token: String, nickname: String, email: String, expires_at: String
}
#[derive(Serialize)] pub struct IdentityResponse { nickname: String, registered: bool }
#[derive(Serialize)] pub struct RegisterResponse {
    token: Option<String>, nickname: String, email: String, expires_at: Option<String>, confirmation_required: bool, message: String
}

pub async fn identity(State(state): State<SharedState>, Json(req): Json<IdentityRequest>) -> Result<Json<IdentityResponse>, AuthError> {
    let nickname = validate_nickname(&req.nickname)?;
    debug!(nickname = %nickname, has_session = req.session_token.is_some(), "identity check requested");
    match find_user_by_nickname(&state, &nickname).await? {
        None => { debug!(nickname = %nickname, "nickname is available for guest use"); Ok(Json(IdentityResponse { nickname, registered: false })) },
        Some(user) => {
            let token = req.session_token.as_deref().ok_or_else(|| AuthError::unauthorized("This nickname is registered. Log in to use it."))?;
            let current = user_from_token(&state, token).await?.ok_or_else(|| AuthError::unauthorized("Your session has expired. Log in again."))?;
            if current.id != user.id { return Err(AuthError::unauthorized("This nickname belongs to another account.")); }
            info!(user_id = user.id, nickname = %user.nickname, "registered identity authorized");
            Ok(Json(IdentityResponse { nickname: user.nickname, registered: true }))
        }
    }
}

pub async fn register(State(state): State<SharedState>, Json(req): Json<RegisterRequest>) -> Result<(StatusCode, Json<RegisterResponse>), AuthError> {
    if !state.registration_enabled { warn!("registration attempt rejected because registration is disabled"); return Err(AuthError::forbidden("Registration is disabled.")); }
    if state.account_confirmation_required && state.smtp.is_none() { return Err(AuthError::service_unavailable("Account confirmation requires SMTP configuration.")); }
    let nickname = validate_nickname(&req.nickname)?;
    let email = validate_email(&req.email)?;
    info!(nickname = %nickname, email_domain = %email_domain(&email), "registration requested");
    validate_password(&req.password)?;
    let nickname_key = normalize(&nickname);
    let email_key = normalize(&email);
    if find_user_by_nickname(&state, &nickname).await?.is_some() { return Err(AuthError::conflict("This nickname is already registered.")); }
    if find_user_by_email(&state, &email).await?.is_some() { return Err(AuthError::conflict("This e-mail address is already registered.")); }
    let hash = hash_password(&req.password)?;
    let confirmed_at = (!state.account_confirmation_required).then(|| Utc::now().to_rfc3339());
    sqlx::query(queries::get(state.db.kind(), queries::AUTH_INSERT_USER))
        .bind(&nickname).bind(nickname_key).bind(&email).bind(email_key).bind(hash).bind(confirmed_at).execute(state.db.pool()).await
        .map_err(AuthError::database)?;
    let user = find_user_by_nickname(&state, &nickname).await?.ok_or_else(|| AuthError::internal("Failed to create the account."))?;

    let mut confirmation_token = None;
    if state.smtp.is_some() {
        let token = random_confirmation_token();
        if state.account_confirmation_required {
            let expires = (Utc::now() + Duration::hours(24)).to_rfc3339();
            sqlx::query(queries::get(state.db.kind(), queries::AUTH_INSERT_CONFIRMATION_TOKEN))
                .bind(hash_token(&token)).bind(user.id).bind(expires).execute(state.db.pool()).await.map_err(AuthError::database)?;
            confirmation_token = Some(token.as_str());
        }
        if let Err(error) = send_registration_email(state.smtp.as_ref().unwrap(), &user, confirmation_token).await {
            if state.account_confirmation_required {
                if let Err(delete_error) = sqlx::query(queries::get(state.db.kind(), queries::AUTH_DELETE_USER)).bind(user.id).execute(state.db.pool()).await {
                    tracing::error!(error=%delete_error, user_id=user.id, "failed to roll back account after confirmation e-mail error");
                }
                return Err(error);
            }
            warn!(user_id = user.id, "account created, but registration e-mail could not be sent");
        }
    } else {
        warn!(user_id = user.id, "account created without registration e-mail because SMTP is not configured");
    }

    if state.account_confirmation_required {
        info!(user_id = user.id, nickname = %user.nickname, "account registered; confirmation required");
        return Ok((StatusCode::CREATED, Json(RegisterResponse {
            token: None, nickname: user.nickname, email: user.email, expires_at: None,
            confirmation_required: true,
            message: "Account created. Check your e-mail and confirm the account before logging in.".into(),
        })));
    }

    let session = create_session(&state, &user).await?;
    info!(user_id = user.id, nickname = %user.nickname, "account registered and session created");
    Ok((StatusCode::CREATED, Json(RegisterResponse {
        token: Some(session.token), nickname: session.nickname, email: session.email, expires_at: Some(session.expires_at),
        confirmation_required: false, message: "Account created.".into(),
    })))
}

pub async fn login(State(state): State<SharedState>, Json(req): Json<LoginRequest>) -> Result<Json<SessionResponse>, AuthError> {
    let email = validate_email(&req.email)?;
    debug!(email_domain = %email_domain(&email), "login requested");
    let user = find_user_by_email(&state, &email).await?.ok_or_else(|| AuthError::unauthorized("Invalid e-mail address or password."))?;
    if !verify_password(&user.password_hash, &req.password) { warn!(user_id = user.id, "login rejected: invalid password"); return Err(AuthError::unauthorized("Invalid e-mail address or password.")); }
    if state.account_confirmation_required && user.confirmed_at.is_none() { return Err(AuthError::forbidden("Confirm the account using the link sent by e-mail before logging in.")); }
    let session = create_session(&state, &user).await?;
    info!(user_id = user.id, nickname = %user.nickname, "login successful");
    Ok(Json(session))
}

pub async fn confirm_account(State(state): State<SharedState>, Json(req): Json<ConfirmAccountRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let now_time = Utc::now();
    let now = now_time.to_rfc3339();
    let token_hash = hash_token(req.token.trim());
    let row: Option<(i64, String, Option<String>)> = sqlx::query_as(queries::get(state.db.kind(), queries::AUTH_FIND_CONFIRMATION_TOKEN))
        .bind(&token_hash).fetch_optional(state.db.pool()).await.map_err(AuthError::database)?;
    let (user_id, expires_at, used_at) = row.ok_or_else(|| AuthError::bad_request("The confirmation link is invalid or has expired."))?;
    let expires_at = chrono::DateTime::parse_from_rfc3339(&expires_at).map_err(|_| AuthError::bad_request("The confirmation link is invalid or has expired."))?.with_timezone(&Utc);
    if used_at.is_some() || expires_at <= now_time { return Err(AuthError::bad_request("The confirmation link is invalid or has expired.")); }
    let mut tx = state.db.pool().begin().await.map_err(AuthError::database)?;
    sqlx::query(queries::get(state.db.kind(), queries::AUTH_CONFIRM_USER)).bind(&now).bind(&now).bind(user_id).execute(&mut *tx).await.map_err(AuthError::database)?;
    sqlx::query(queries::get(state.db.kind(), queries::AUTH_MARK_CONFIRMATION_TOKEN_USED)).bind(&now).bind(&token_hash).execute(&mut *tx).await.map_err(AuthError::database)?;
    tx.commit().await.map_err(AuthError::database)?;
    info!(user_id, "account confirmed");
    Ok(Json(serde_json::json!({"ok": true, "message": "Account confirmed. You can now log in."})))
}

pub async fn me(State(state): State<SharedState>, headers: HeaderMap) -> Result<Json<SessionResponse>, AuthError> {
    let token = bearer(&headers).ok_or_else(|| AuthError::unauthorized("Not logged in."))?;
    let user = user_from_token(&state, token).await?.ok_or_else(|| AuthError::unauthorized("Your session has expired."))?;
    debug!(user_id = user.id, "session validation successful");
    let expires_at: String = sqlx::query_scalar(queries::get(state.db.kind(), queries::AUTH_SESSION_EXPIRES_AT))
        .bind(token).fetch_one(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(Json(SessionResponse { token: token.into(), nickname: user.nickname, email: user.email, expires_at }))
}

pub async fn resources(State(state): State<SharedState>, headers: HeaderMap) -> Result<Json<ResourceList>, AuthError> {
    let user = require_user(&state, &headers).await?;
    let workspaces = sqlx::query_as::<_, ResourceItem>(queries::get(state.db.kind(), queries::USER_LIST_WORKSPACES)).bind(user.id).bind(user.id).fetch_all(state.db.pool()).await.map_err(AuthError::database)?;
    let pads = sqlx::query_as::<_, ResourceItem>(queries::get(state.db.kind(), queries::USER_LIST_PADS)).bind(user.id).bind(user.id).fetch_all(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(Json(ResourceList { workspaces, pads }))
}

pub async fn update_resource(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<ResourceActionRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let user = require_user(&state, &headers).await?;
    let hash = match req.password.as_deref().map(str::trim).filter(|v| !v.is_empty()) { Some(v) => { validate_password(v)?; Some(hash_password(v)?) }, None => None };
    ensure_owner(&state, user.id, &req.kind, &req.slug).await?;
    let query = match req.kind.as_str() { "workspace" => queries::USER_SET_WORKSPACE_PASSWORD, "pad" => queries::USER_SET_PAD_PASSWORD, _ => return Err(AuthError::bad_request("Unknown resource type.")) };
    sqlx::query(queries::get(state.db.kind(), query)).bind(hash).bind(req.slug.trim()).execute(state.db.pool()).await.map_err(AuthError::database)?;
    sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_access_tokens WHERE resource_kind = ? AND resource_slug = ?"))
        .bind(req.kind.as_str()).bind(req.slug.trim()).execute(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(Json(serde_json::json!({"ok":true})))
}

pub async fn delete_resource(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<ResourceActionRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let user = require_user(&state, &headers).await?;
    ensure_owner(&state, user.id, &req.kind, &req.slug).await?;
    let query = match req.kind.as_str() { "workspace" => queries::USER_DELETE_WORKSPACE, "pad" => queries::USER_DELETE_PAD, _ => return Err(AuthError::bad_request("Unknown resource type.")) };
    sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_access_tokens WHERE resource_kind = ? AND resource_slug = ?"))
        .bind(req.kind.as_str()).bind(req.slug.trim()).execute(state.db.pool()).await.map_err(AuthError::database)?;
    sqlx::query(queries::get(state.db.kind(), query)).bind(req.slug.trim()).execute(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(Json(serde_json::json!({"ok":true})))
}

pub async fn optional_user(state: &SharedState, headers: &HeaderMap) -> Result<Option<User>, AuthError> {
    match bearer(headers) { Some(token) => user_from_token(state, token).await, None => Ok(None) }
}

async fn require_user(state: &SharedState, headers: &HeaderMap) -> Result<User, AuthError> {
    optional_user(state, headers).await?.ok_or_else(|| AuthError::unauthorized("Log in first."))
}

async fn ensure_owner(state: &SharedState, user_id: i64, kind: &str, slug: &str) -> Result<(), AuthError> {
    let query = match kind { "workspace" => queries::USER_OWNS_WORKSPACE, "pad" => queries::USER_OWNS_PAD, _ => return Err(AuthError::bad_request("Unknown resource type.")) };
    let count: i64 = sqlx::query_scalar(queries::get(state.db.kind(), query)).bind(user_id).bind(slug.trim()).fetch_one(state.db.pool()).await.map_err(AuthError::database)?;
    if count == 0 { return Err(AuthError::forbidden("This item does not belong to your account.")); }
    Ok(())
}


pub async fn set_resource_privacy(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<PrivacyRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let user = require_user(&state, &headers).await?;
    ensure_owner(&state, user.id, &req.kind, &req.slug).await?;
    let table = match req.kind.as_str() { "workspace" => "workspaces", "pad" => "pads", _ => return Err(AuthError::bad_request("Unknown resource type.")) };
    let query = format!("UPDATE {table} SET is_private = ?, updated_at = CURRENT_TIMESTAMP WHERE slug = ?");
    sqlx::query(&query).bind(req.private).bind(req.slug.trim()).execute(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(Json(serde_json::json!({"ok":true})))
}

pub async fn share_resource_users(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<ShareUsersRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let owner = require_user(&state, &headers).await?;
    ensure_owner(&state, owner.id, &req.kind, &req.slug).await?;
    let permission = validate_permission(&req.permission)?;
    if state.share_confirmation_required && state.smtp.is_none() {
        return Err(AuthError::service_unavailable("Share confirmation requires SMTP configuration."));
    }
    let emails: Vec<String> = req.emails.split(',').map(|v| normalize(v)).filter(|v| !v.is_empty()).collect();
    if emails.is_empty() || emails.len() > 100 { return Err(AuthError::bad_request("Enter between 1 and 100 registered e-mail addresses.")); }
    let mut missing = Vec::new();
    for email in emails {
        let user = find_user_by_email(&state, &email).await?;
        let Some(user) = user else { missing.push(email); continue; };
        if user.id == owner.id { continue; }

        sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_permissions WHERE resource_kind = ? AND resource_slug = ? AND user_id = ?"))
            .bind(&req.kind).bind(req.slug.trim()).bind(user.id).execute(state.db.pool()).await.map_err(AuthError::database)?;
        sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_share_invitations WHERE resource_kind = ? AND resource_slug = ? AND user_id = ?"))
            .bind(&req.kind).bind(req.slug.trim()).bind(user.id).execute(state.db.pool()).await.map_err(AuthError::database)?;

        if state.share_confirmation_required {
            let token = random_token();
            let token_hash = hash_token(&token);
            let expires_at = (Utc::now() + Duration::days(7)).to_rfc3339();
            sqlx::query(queries::get(state.db.kind(), "INSERT INTO resource_share_invitations (token_hash, resource_kind, resource_slug, user_id, permission, created_by, expires_at) VALUES (?, ?, ?, ?, ?, ?, ?)"))
                .bind(&token_hash).bind(&req.kind).bind(req.slug.trim()).bind(user.id).bind(permission).bind(owner.id).bind(&expires_at)
                .execute(state.db.pool()).await.map_err(AuthError::database)?;
            if let Err(error) = send_share_invitation(state.smtp.as_ref().unwrap(), &owner, &user, &req.kind, req.slug.trim(), permission, &token).await {
                let _ = sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_share_invitations WHERE token_hash = ?"))
                    .bind(&token_hash).execute(state.db.pool()).await;
                return Err(error);
            }
        } else {
            sqlx::query(queries::get(state.db.kind(), "INSERT INTO resource_permissions (resource_kind, resource_slug, user_id, permission) VALUES (?, ?, ?, ?)"))
                .bind(&req.kind).bind(req.slug.trim()).bind(user.id).bind(permission).execute(state.db.pool()).await.map_err(AuthError::database)?;
        }
    }
    if !missing.is_empty() { return Err(AuthError::bad_request(&format!("No registered account for: {}", missing.join(", ")))); }
    Ok(Json(serde_json::json!({"ok":true,"confirmation_required":state.share_confirmation_required})))
}

pub async fn accept_share_invitation(State(state): State<SharedState>, AxumPath(token): AxumPath<String>) -> Result<Redirect, AuthError> {
    let token_hash = hash_token(token.trim());
    let row: Option<(String, String, i64, String, String, Option<String>)> = sqlx::query_as(queries::get(state.db.kind(), "SELECT resource_kind, resource_slug, user_id, permission, expires_at, accepted_at FROM resource_share_invitations WHERE token_hash = ?"))
        .bind(&token_hash).fetch_optional(state.db.pool()).await.map_err(AuthError::database)?;
    let (kind, slug, user_id, permission, expires_at, accepted_at) = row.ok_or_else(|| AuthError::bad_request("The sharing invitation is invalid or has expired."))?;
    let expires = chrono::DateTime::parse_from_rfc3339(&expires_at).map_err(|_| AuthError::bad_request("The sharing invitation is invalid or has expired."))?.with_timezone(&Utc);
    if accepted_at.is_none() {
        if expires <= Utc::now() { return Err(AuthError::bad_request("The sharing invitation is invalid or has expired.")); }
        let mut tx = state.db.pool().begin().await.map_err(AuthError::database)?;
        sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_permissions WHERE resource_kind = ? AND resource_slug = ? AND user_id = ?"))
            .bind(&kind).bind(&slug).bind(user_id).execute(&mut *tx).await.map_err(AuthError::database)?;
        sqlx::query(queries::get(state.db.kind(), "INSERT INTO resource_permissions (resource_kind, resource_slug, user_id, permission) VALUES (?, ?, ?, ?)"))
            .bind(&kind).bind(&slug).bind(user_id).bind(&permission).execute(&mut *tx).await.map_err(AuthError::database)?;
        sqlx::query(queries::get(state.db.kind(), "UPDATE resource_share_invitations SET accepted_at = ? WHERE token_hash = ?"))
            .bind(Utc::now().to_rfc3339()).bind(&token_hash).execute(&mut *tx).await.map_err(AuthError::database)?;
        tx.commit().await.map_err(AuthError::database)?;
    }
    let target = if kind == "workspace" { format!("/w/{slug}") } else { format!("/p/{slug}") };
    Ok(Redirect::to(&target))
}

pub async fn remove_resource_user(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<RemoveShareRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let owner = require_user(&state, &headers).await?;
    ensure_owner(&state, owner.id, &req.kind, &req.slug).await?;
    let email = normalize(&req.email);
    if let Some(user) = find_user_by_email(&state, &email).await? {
        sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_permissions WHERE resource_kind = ? AND resource_slug = ? AND user_id = ?"))
            .bind(&req.kind).bind(req.slug.trim()).bind(user.id).execute(state.db.pool()).await.map_err(AuthError::database)?;
        sqlx::query(queries::get(state.db.kind(), "DELETE FROM resource_share_invitations WHERE resource_kind = ? AND resource_slug = ? AND user_id = ?"))
            .bind(&req.kind).bind(req.slug.trim()).bind(user.id).execute(state.db.pool()).await.map_err(AuthError::database)?;
    }
    Ok(Json(serde_json::json!({"ok":true})))
}

pub async fn resource_sharing(State(state): State<SharedState>, headers: HeaderMap, axum::extract::Query(params): axum::extract::Query<std::collections::HashMap<String,String>>) -> Result<Json<serde_json::Value>, AuthError> {
    let owner = require_user(&state, &headers).await?;
    let kind = params.get("kind").ok_or_else(|| AuthError::bad_request("Missing kind."))?;
    let slug = params.get("slug").ok_or_else(|| AuthError::bad_request("Missing slug."))?;
    ensure_owner(&state, owner.id, kind, slug).await?;
    let users: Vec<(String,String,String)> = sqlx::query_as(queries::get(state.db.kind(), "SELECT u.email, u.nickname, rp.permission FROM resource_permissions rp JOIN users u ON u.id = rp.user_id WHERE rp.resource_kind = ? AND rp.resource_slug = ? ORDER BY u.email"))
        .bind(kind).bind(slug).fetch_all(state.db.pool()).await.map_err(AuthError::database)?;
    let links: Vec<(String,String,Option<String>,String)> = sqlx::query_as(queries::get(state.db.kind(), "SELECT token_hash, permission, expires_at, created_at FROM resource_share_links WHERE resource_kind = ? AND resource_slug = ? AND revoked_at IS NULL ORDER BY created_at DESC"))
        .bind(kind).bind(slug).fetch_all(state.db.pool()).await.map_err(AuthError::database)?;
    let pending: Vec<(String,String,String,String)> = sqlx::query_as(queries::get(state.db.kind(), "SELECT u.email, u.nickname, i.permission, i.expires_at FROM resource_share_invitations i JOIN users u ON u.id = i.user_id WHERE i.resource_kind = ? AND i.resource_slug = ? AND i.accepted_at IS NULL ORDER BY u.email"))
        .bind(kind).bind(slug).fetch_all(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(Json(serde_json::json!({"users":users.into_iter().map(|(email,nickname,permission)|serde_json::json!({"email":email,"nickname":nickname,"permission":permission})).collect::<Vec<_>>(), "pending":pending.into_iter().map(|(email,nickname,permission,expires_at)|serde_json::json!({"email":email,"nickname":nickname,"permission":permission,"expires_at":expires_at})).collect::<Vec<_>>(), "links":links.into_iter().map(|(token,permission,expires_at,created_at)|serde_json::json!({"token":token,"permission":permission,"expires_at":expires_at,"created_at":created_at})).collect::<Vec<_>>() })))
}

pub async fn create_share_link(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<CreateShareLinkRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let owner = require_user(&state, &headers).await?;
    ensure_owner(&state, owner.id, &req.kind, &req.slug).await?;
    let permission = validate_permission(&req.permission)?;
    validate_share_expiration(req.expires_at.as_deref())?;
    let token = random_token(); let token_hash = hash_token(&token);
    sqlx::query(queries::get(state.db.kind(), "INSERT INTO resource_share_links (token_hash, resource_kind, resource_slug, permission, expires_at, created_by) VALUES (?, ?, ?, ?, ?, ?)"))
        .bind(token_hash).bind(&req.kind).bind(req.slug.trim()).bind(permission).bind(&req.expires_at).bind(owner.id).execute(state.db.pool()).await.map_err(AuthError::database)?;
    let base = if req.kind == "workspace" { format!("/w/{}", req.slug.trim()) } else { format!("/p/{}", req.slug.trim()) };
    Ok(Json(serde_json::json!({"token":token,"url":format!("{base}?share={token}"),"permission":permission,"expires_at":req.expires_at})))
}


pub async fn update_share_link(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<UpdateShareLinkRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let owner = require_user(&state, &headers).await?;
    ensure_owner(&state, owner.id, &req.kind, &req.slug).await?;
    let permission = validate_permission(&req.permission)?;
    validate_share_expiration(req.expires_at.as_deref())?;
    let result = sqlx::query(queries::get(state.db.kind(), "UPDATE resource_share_links SET permission = ?, expires_at = ? WHERE token_hash = ? AND resource_kind = ? AND resource_slug = ? AND revoked_at IS NULL"))
        .bind(permission).bind(&req.expires_at).bind(req.token.trim()).bind(&req.kind).bind(req.slug.trim()).execute(state.db.pool()).await.map_err(AuthError::database)?;
    if result.rows_affected() == 0 { return Err(AuthError::bad_request("Share link was not found or is already revoked.")); }
    Ok(Json(serde_json::json!({"ok":true,"permission":permission,"expires_at":req.expires_at})))
}

pub async fn revoke_share_link(State(state): State<SharedState>, headers: HeaderMap, Json(req): Json<RevokeShareLinkRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let owner = require_user(&state, &headers).await?;
    ensure_owner(&state, owner.id, &req.kind, &req.slug).await?;
    sqlx::query(queries::get(state.db.kind(), "UPDATE resource_share_links SET revoked_at = ? WHERE token_hash = ? AND resource_kind = ? AND resource_slug = ?"))
        .bind(Utc::now().to_rfc3339()).bind(req.token.trim()).bind(&req.kind).bind(req.slug.trim()).execute(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(Json(serde_json::json!({"ok":true})))
}

fn validate_permission(value: &str) -> Result<&str, AuthError> { match value { "ro"|"rw" => Ok(value), _ => Err(AuthError::bad_request("Permission must be ro or rw.")) } }

fn validate_share_expiration(value: Option<&str>) -> Result<(), AuthError> {
    let Some(value) = value else { return Ok(()); };
    let expires = chrono::DateTime::parse_from_rfc3339(value).map_err(|_| AuthError::bad_request("Invalid expiration date."))?.with_timezone(&Utc);
    if expires <= Utc::now() { return Err(AuthError::bad_request("Expiration must be in the future.")); }
    Ok(())
}

pub async fn resource_permission(state: &SharedState, kind: &str, slug: &str, token: Option<&str>) -> Result<Option<String>, AuthError> {
    let Some(token) = token.filter(|v| !v.is_empty()) else { return Ok(None); };
    if let Some(user) = user_from_token(state, token).await? {
        let owns = ensure_owner(state, user.id, kind, slug).await.is_ok();
        if owns { return Ok(Some("rw".into())); }
        let permission: Option<String> = sqlx::query_scalar(queries::get(state.db.kind(), "SELECT permission FROM resource_permissions WHERE resource_kind = ? AND resource_slug = ? AND user_id = ?"))
            .bind(kind).bind(slug).bind(user.id).fetch_optional(state.db.pool()).await.map_err(AuthError::database)?;
        return Ok(permission);
    }
    let now = Utc::now().to_rfc3339();
    let permission: Option<String> = sqlx::query_scalar(queries::get(state.db.kind(), "SELECT permission FROM resource_share_links WHERE token_hash = ? AND resource_kind = ? AND resource_slug = ? AND revoked_at IS NULL AND (expires_at IS NULL OR expires_at > ?)"))
        .bind(hash_token(token)).bind(kind).bind(slug).bind(now).fetch_optional(state.db.pool()).await.map_err(AuthError::database)?;
    Ok(permission)
}

pub async fn logout(State(state): State<SharedState>, headers: HeaderMap) -> Result<Json<serde_json::Value>, AuthError> {
    if let Some(token) = bearer(&headers) {
        let result = sqlx::query(queries::get(state.db.kind(), queries::AUTH_DELETE_SESSION_BY_TOKEN)).bind(token).execute(state.db.pool()).await.map_err(AuthError::database)?;
        info!(rows_affected = result.rows_affected(), "logout processed");
    } else { debug!("logout requested without an active session"); }
    Ok(Json(serde_json::json!({"ok": true})))
}

pub async fn request_reset(State(state): State<SharedState>, Json(req): Json<ResetRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    let email = validate_email(&req.email)?;
    info!(email_domain = %email_domain(&email), "password reset requested");
    let smtp = state.smtp.as_ref().ok_or_else(|| AuthError::service_unavailable("Password reset is not configured on this server."))?;
    if let Some(user) = find_user_by_email(&state, &email).await? {
            let token = random_token();
            let expires = (Utc::now() + Duration::minutes(30)).to_rfc3339();
            sqlx::query(queries::get(state.db.kind(), queries::AUTH_DELETE_RESET_TOKENS_BY_USER)).bind(user.id).execute(state.db.pool()).await.map_err(AuthError::database)?;
            sqlx::query(queries::get(state.db.kind(), queries::AUTH_INSERT_RESET_TOKEN))
                .bind(hash_token(&token)).bind(user.id).bind(expires).execute(state.db.pool()).await.map_err(AuthError::database)?;
        send_reset(smtp, &user, &token).await?;
        info!(user_id = user.id, "password reset e-mail sent");
    } else {
        debug!(email_domain = %email_domain(&email), "password reset requested for unknown account");
    }
    Ok(Json(serde_json::json!({"ok": true, "message": "If the account exists, a reset link has been sent."})))
}

pub async fn confirm_reset(State(state): State<SharedState>, Json(req): Json<ResetConfirmRequest>) -> Result<Json<serde_json::Value>, AuthError> {
    validate_password(&req.password)?;
    info!("password reset confirmation requested");
    let now_time = Utc::now();
    let now = now_time.to_rfc3339();
    let token_hash = hash_token(req.token.trim());
    let token_row: Option<(i64, String, Option<String>)> = sqlx::query_as(queries::get(state.db.kind(), queries::AUTH_FIND_RESET_TOKEN))
        .bind(&token_hash).fetch_optional(state.db.pool()).await.map_err(AuthError::database)?;
    let (user_id, expires_at, used_at) = token_row.ok_or_else(|| AuthError::bad_request("The reset link is invalid or has expired."))?;
    let expires_at = chrono::DateTime::parse_from_rfc3339(&expires_at)
        .map_err(|_| AuthError::bad_request("The reset link is invalid or has expired."))?
        .with_timezone(&Utc);
    if used_at.is_some() || expires_at <= now_time {
        warn!(user_id, used = used_at.is_some(), expired = expires_at <= now_time, "password reset token rejected");
        return Err(AuthError::bad_request("The reset link is invalid or has expired."));
    }
    let password_hash = hash_password(&req.password)?;
    let mut tx = state.db.pool().begin().await.map_err(AuthError::database)?;
    let updated = sqlx::query(queries::get(state.db.kind(), queries::AUTH_UPDATE_PASSWORD))
        .bind(password_hash).bind(&now).bind(user_id).execute(&mut *tx).await.map_err(AuthError::database)?;
    if updated.rows_affected() != 1 { return Err(AuthError::internal("The account could not be updated.")); }
    sqlx::query(queries::get(state.db.kind(), queries::AUTH_MARK_RESET_TOKEN_USED))
        .bind(&now).bind(&token_hash).execute(&mut *tx).await.map_err(AuthError::database)?;
    sqlx::query(queries::get(state.db.kind(), queries::AUTH_DELETE_SESSIONS_BY_USER))
        .bind(user_id).execute(&mut *tx).await.map_err(AuthError::database)?;
    tx.commit().await.map_err(AuthError::database)?;
    info!(user_id, "password reset completed and existing sessions revoked");
    Ok(Json(serde_json::json!({"ok": true})))
}

pub async fn user_from_token(state: &SharedState, token: &str) -> Result<Option<User>, AuthError> {
    let now = Utc::now().to_rfc3339();
    sqlx::query_as::<_, User>(queries::get(state.db.kind(), queries::AUTH_USER_BY_SESSION))
        .bind(token).bind(now).fetch_optional(state.db.pool()).await.map_err(AuthError::database)
}

pub async fn authorize_nickname(state: &SharedState, nickname: Option<String>, token: Option<String>) -> Result<Option<String>, String> {
    let Some(nickname) = nickname else { return Ok(None); };
    let nickname = validate_nickname(&nickname).map_err(|e| e.message)?;
    let registered = find_user_by_nickname(state, &nickname).await.map_err(|_| "Database error".to_string())?;
    match registered {
        None => Ok(Some(nickname)),
        Some(owner) => {
            let Some(token) = token else { return Err("This nickname is registered. Log in to use it.".into()); };
            let current = user_from_token(state, &token).await.map_err(|_| "Database error".to_string())?;
            match current { Some(user) if user.id == owner.id => Ok(Some(owner.nickname)), _ => Err("This nickname belongs to another account or the session expired.".into()) }
        }
    }
}

async fn create_session(state: &SharedState, user: &User) -> Result<SessionResponse, AuthError> {
    let token = random_token();
    let expires_at = (Utc::now() + Duration::days(state.user_session_ttl_days)).to_rfc3339();
    sqlx::query(queries::get(state.db.kind(), queries::AUTH_INSERT_SESSION))
        .bind(&token).bind(user.id).bind(&expires_at).execute(state.db.pool()).await.map_err(AuthError::database)?;
    debug!(user_id = user.id, expires_at = %expires_at, "authentication session created");
    Ok(SessionResponse { token, nickname: user.nickname.clone(), email: user.email.clone(), expires_at })
}
async fn find_user_by_nickname(state: &SharedState, nickname: &str) -> Result<Option<User>, AuthError> {
    sqlx::query_as::<_, User>(queries::get(state.db.kind(), queries::AUTH_USER_BY_NICKNAME))
        .bind(normalize(nickname)).fetch_optional(state.db.pool()).await.map_err(AuthError::database)
}
async fn find_user_by_email(state: &SharedState, email: &str) -> Result<Option<User>, AuthError> {
    sqlx::query_as::<_, User>(queries::get(state.db.kind(), queries::AUTH_USER_BY_EMAIL))
        .bind(normalize(email)).fetch_optional(state.db.pool()).await.map_err(AuthError::database)
}
fn validate_nickname(v: &str) -> Result<String, AuthError> {
    let v=v.trim();
    if v.is_empty() || v.chars().count()>MAX_NICKNAME {
        return Err(AuthError::bad_request("Nickname must contain 1 to 40 characters."));
    }
    if v.chars().any(|c| c.is_control()) {
        return Err(AuthError::bad_request("Nickname contains invalid characters."));
    }
    Ok(v.into())
}
fn validate_email(value: &str) -> Result<String, AuthError> {
    let value = value.trim();

    if value.len() > 320
        || !value.contains('@')
        || value.starts_with('@')
        || value.ends_with('@')
    {
        return Err(AuthError::bad_request("Enter a valid e-mail address."));
    }

    Ok(value.into())
}

fn validate_password(value: &str) -> Result<(), AuthError> {
    if value.len() < MIN_PASSWORD || value.len() > MAX_PASSWORD {
        return Err(AuthError::bad_request(
            "Password must contain 8 to 128 characters.",
        ));
    }

    Ok(())
}

fn normalize(value: &str) -> String {
    value.trim().to_lowercase()
}

fn hash_password(value: &str) -> Result<String, AuthError> {
    let salt = SaltString::generate(&mut OsRng);

    Argon2::default()
        .hash_password(value.as_bytes(), &salt)
        .map(|hash| hash.to_string())
        .map_err(|_| AuthError::internal("Failed to secure the password."))
}

fn verify_password(hash: &str, value: &str) -> bool {
    PasswordHash::new(hash)
        .ok()
        .and_then(|hash| {
            Argon2::default()
                .verify_password(value.as_bytes(), &hash)
                .ok()
        })
        .is_some()
}

fn random_token() -> String {
    random_hex_token::<32>()
}

fn random_confirmation_token() -> String {
    random_hex_token::<32>()
}

fn random_hex_token<const N: usize>() -> String {
    let mut bytes = [0_u8; N];
    let mut rng = OsRng;
    rng.fill_bytes(&mut bytes);

    bytes.iter().map(|byte| format!("{byte:02x}")).collect()
}

fn hash_token(value: &str) -> String {
    format!("{:x}", Sha256::digest(value.as_bytes()))
}

fn bearer(headers: &HeaderMap) -> Option<&str> {
    headers
        .get("authorization")?
        .to_str()
        .ok()?
        .strip_prefix("Bearer ")
}

async fn send_registration_email(
    smtp: &SmtpConfig,
    user: &User,
    token: Option<&str>,
) -> Result<(), AuthError> {
    let site = smtp.public_url.trim_end_matches('/');
    let sender = smtp
        .from
        .parse::<Mailbox>()
        .map_err(|_| AuthError::internal("Invalid SMTP_FROM."))?;
    let recipient = user
        .email
        .parse::<Mailbox>()
        .map_err(|_| AuthError::internal("Invalid recipient address."))?;

    let builder = Message::builder().from(sender).to(recipient);

    let message = match token {
        Some(token) => {
            let confirmation_url = format!("{site}/?confirm_token={token}");
            let subject = "Confirm your RustPad account";
            let text_body = format!(
                "Hello {},\n\nYour RustPad account has been created.\nNickname: {}\nSite: {}\n\nConfirm the account within 24 hours by opening this link:\n{}\n",
                user.nickname, user.nickname, site, confirmation_url
            );
            let html_body = format!(
                r#"<!doctype html>
<html lang="en">
  <body style="margin: 0; padding: 24px; background: #f4f4f5; font-family: Arial, sans-serif; color: #18181b;">
    <div style="max-width: 560px; margin: 0 auto; padding: 24px; background: #ffffff; border-radius: 10px;">
      <h1 style="margin-top: 0; font-size: 22px;">Confirm your RustPad account</h1>
      <p>Hello {},</p>
      <p>Your RustPad account has been created.</p>
      <p><strong>Nickname:</strong> {}<br><strong>Site:</strong> {}</p>
      <p>Confirm the account within 24 hours:</p>
      <p><a href="{}" style="display: inline-block; padding: 11px 18px; background: #2563eb; color: #ffffff; text-decoration: none; border-radius: 6px;">Confirm account</a></p>
      <p style="font-size: 13px; color: #52525b;">If the button does not work, open this address:</p>
      <p style="font-size: 13px; overflow-wrap: anywhere;"><a href="{}">{}</a></p>
    </div>
  </body>
</html>"#,
                user.nickname,
                user.nickname,
                site,
                confirmation_url,
                confirmation_url,
                confirmation_url
            );

            builder
                .subject(subject)
                .multipart(
                    MultiPart::alternative()
                        .singlepart(
                            SinglePart::builder()
                                .header(ContentType::TEXT_PLAIN)
                                .body(text_body),
                        )
                        .singlepart(
                            SinglePart::builder()
                                .header(ContentType::TEXT_HTML)
                                .body(html_body),
                        ),
                )
                .map_err(|_| AuthError::internal("Failed to build registration e-mail."))?
        }
        None => {
            let subject = "Your RustPad account has been created";
            let text_body = format!(
                "Hello {},\n\nYour RustPad account has been created.\nNickname: {}\nSite: {}\n",
                user.nickname, user.nickname, site
            );
            let html_body = format!(
                r#"<!doctype html>
<html lang="en">
  <body style="margin: 0; padding: 24px; background: #f4f4f5; font-family: Arial, sans-serif; color: #18181b;">
    <div style="max-width: 560px; margin: 0 auto; padding: 24px; background: #ffffff; border-radius: 10px;">
      <h1 style="margin-top: 0; font-size: 22px;">Your RustPad account is ready</h1>
      <p>Hello {},</p>
      <p>Your RustPad account has been created.</p>
      <p><strong>Nickname:</strong> {}</p>
      <p><a href="{}" style="display: inline-block; padding: 11px 18px; background: #2563eb; color: #ffffff; text-decoration: none; border-radius: 6px;">Open RustPad</a></p>
    </div>
  </body>
</html>"#,
                user.nickname, user.nickname, site
            );

            builder
                .subject(subject)
                .multipart(
                    MultiPart::alternative()
                        .singlepart(
                            SinglePart::builder()
                                .header(ContentType::TEXT_PLAIN)
                                .body(text_body),
                        )
                        .singlepart(
                            SinglePart::builder()
                                .header(ContentType::TEXT_HTML)
                                .body(html_body),
                        ),
                )
                .map_err(|_| AuthError::internal("Failed to build registration e-mail."))?
        }
    };

    send_message(smtp, message, "registration e-mail").await
}

async fn send_share_invitation(
    smtp: &SmtpConfig,
    owner: &User,
    recipient_user: &User,
    kind: &str,
    slug: &str,
    permission: &str,
    token: &str,
) -> Result<(), AuthError> {
    let site = smtp.public_url.trim_end_matches('/');
    let accept_url = format!("{site}/share-invitations/{token}/accept");
    let resource_label = if kind == "workspace" { "workspace" } else { "note" };
    let access_label = if permission == "rw" { "view and edit" } else { "view" };
    let sender = smtp.from.parse::<Mailbox>().map_err(|_| AuthError::internal("Invalid SMTP_FROM."))?;
    let recipient = recipient_user.email.parse::<Mailbox>().map_err(|_| AuthError::internal("Invalid recipient address."))?;
    let subject = format!("{} shared a RustPad {} with you", owner.nickname, resource_label);
    let text_body = format!(
        "Hello {},\n\n{} shared the {} '{}' with you ({access_label}).\nAccept the invitation within 7 days:\n{}\n\nIf you were not expecting this invitation, ignore this message.",
        recipient_user.nickname, owner.nickname, resource_label, slug, accept_url
    );
    let html_body = format!(r#"<!doctype html><html lang="en"><body style="margin:0;padding:24px;background:#f4f4f5;font-family:Arial,sans-serif;color:#18181b"><div style="max-width:560px;margin:0 auto;padding:24px;background:#fff;border-radius:10px"><h1 style="margin-top:0;font-size:22px">A RustPad {resource_label} was shared with you</h1><p>Hello {},</p><p><strong>{}</strong> shared <strong>{}</strong> with you. Permission: <strong>{access_label}</strong>.</p><p><a href="{}" style="display:inline-block;padding:11px 18px;background:#2563eb;color:#fff;text-decoration:none;border-radius:6px">Accept invitation</a></p><p style="font-size:13px;color:#52525b">This link expires in 7 days.</p></div></body></html>"#,
        recipient_user.nickname, owner.nickname, slug, accept_url
    );
    let message = Message::builder().from(sender).to(recipient).subject(subject)
        .multipart(MultiPart::alternative()
            .singlepart(SinglePart::builder().header(ContentType::TEXT_PLAIN).body(text_body))
            .singlepart(SinglePart::builder().header(ContentType::TEXT_HTML).body(html_body)))
        .map_err(|_| AuthError::internal("Failed to build sharing invitation e-mail."))?;
    send_message(smtp, message, "sharing invitation e-mail").await
}

async fn send_message(
    smtp: &SmtpConfig,
    message: Message,
    label: &str,
) -> Result<(), AuthError> {
    let mut builder = if smtp.port == 465 {
        AsyncSmtpTransport::<Tokio1Executor>::relay(&smtp.host)
    } else {
        AsyncSmtpTransport::<Tokio1Executor>::starttls_relay(&smtp.host)
    }
    .map_err(|error| {
        tracing::error!(error = %error, host = %smtp.host, port = smtp.port, "invalid SMTP configuration");
        AuthError::internal("Invalid SMTP configuration.")
    })?
    .port(smtp.port);

    if !smtp.username.is_empty() {
        builder = builder.credentials(Credentials::new(
            smtp.username.clone(),
            smtp.password.clone(),
        ));
    }

    builder.build().send(message).await.map_err(|error| {
        tracing::error!(error = %error, host = %smtp.host, port = smtp.port, message_type = label, "SMTP delivery failed");
        AuthError::service_unavailable(
            "The e-mail could not be sent. Check the SMTP configuration.",
        )
    })?;

    Ok(())
}

async fn send_reset(
    smtp: &SmtpConfig,
    user: &User,
    token: &str,
) -> Result<(), AuthError> {
    let site = smtp.public_url.trim_end_matches('/');
    let reset_url = format!("{site}/?reset_token={token}");
    let sender = smtp
        .from
        .parse::<Mailbox>()
        .map_err(|_| AuthError::internal("Invalid SMTP_FROM."))?;
    let recipient = user
        .email
        .parse::<Mailbox>()
        .map_err(|_| AuthError::internal("Invalid recipient address."))?;

    let text_body = format!(
        "Hello {},\n\nUse this link within 30 minutes to set a new password:\n{}\n\nIf you did not request this, ignore this message.",
        user.nickname, reset_url
    );
    let html_body = format!(
        r#"<!doctype html>
<html lang="en">
  <body style="margin: 0; padding: 24px; background: #f4f4f5; font-family: Arial, sans-serif; color: #18181b;">
    <div style="max-width: 560px; margin: 0 auto; padding: 24px; background: #ffffff; border-radius: 10px;">
      <h1 style="margin-top: 0; font-size: 22px;">Reset your RustPad password</h1>
      <p>Hello {},</p>
      <p>Use the button below within 30 minutes to set a new password.</p>
      <p><a href="{}" style="display: inline-block; padding: 11px 18px; background: #2563eb; color: #ffffff; text-decoration: none; border-radius: 6px;">Reset password</a></p>
      <p style="font-size: 13px; color: #52525b;">If the button does not work, open this address:</p>
      <p style="font-size: 13px; overflow-wrap: anywhere;"><a href="{}">{}</a></p>
      <p>If you did not request a password reset, ignore this message.</p>
    </div>
  </body>
</html>"#,
        user.nickname, reset_url, reset_url, reset_url
    );

    let message = Message::builder()
        .from(sender)
        .to(recipient)
        .subject("RustPad password reset")
        .multipart(
            MultiPart::alternative()
                .singlepart(
                    SinglePart::builder()
                        .header(ContentType::TEXT_PLAIN)
                        .body(text_body),
                )
                .singlepart(
                    SinglePart::builder()
                        .header(ContentType::TEXT_HTML)
                        .body(html_body),
                ),
        )
        .map_err(|_| AuthError::internal("Failed to build reset e-mail."))?;

    send_message(smtp, message, "password reset e-mail").await
}

pub struct AuthError { status: StatusCode, pub message: String }
impl AuthError {
    fn bad_request(m:&str)->Self {
        Self {
            status:StatusCode::BAD_REQUEST,message:m.into()
        }
    }
    fn unauthorized(m:&str)->Self {
        Self {
            status:StatusCode::UNAUTHORIZED,message:m.into()
        }
    }
    fn forbidden(m:&str)->Self {
        Self {
            status:StatusCode::FORBIDDEN,message:m.into()
        }
    }
    fn conflict(m:&str)->Self {
        Self {
            status:StatusCode::CONFLICT,message:m.into()
        }
    }
    fn internal(m:&str)->Self {
        Self {
            status:StatusCode::INTERNAL_SERVER_ERROR,message:m.into()
        }
    }
    fn service_unavailable(m:&str)->Self {
        Self {
            status:StatusCode::SERVICE_UNAVAILABLE,message:m.into()
        }
    }
    fn database(e:sqlx::Error)->Self {
        tracing::error!(error=%e,"authentication database error");
        Self::internal("Database error.")
    }
}

fn email_domain(email: &str) -> &str {
    email.rsplit_once('@').map(|(_, domain)| domain).unwrap_or("invalid")
}
impl axum::response::IntoResponse for AuthError {
    fn into_response(self)->axum::response::Response {
        (self.status,Json(serde_json::json!( {
            "error":self.message
        }
        ))).into_response()
    }
}