import { api } from "@rustpad/api";
import { copyText } from "@rustpad/clipboard";
import { applyFormat } from "@rustpad/editor-format";
import { renderMarkdown } from "@rustpad/markdown";
import { prepareImageFile } from "./image-upload.js";
import { getNickname, setNickname } from "@rustpad/session";
import { PadSocket } from "@rustpad/socket";
import { currentShareUrl, readEditorState, writeEditorState } from "@rustpad/url-state";

const slug=location.pathname.split("/").filter(Boolean)[1];
const editor=document.querySelector("#editor"), preview=document.querySelector("#preview"), editorWorkspace=document.querySelector("#editor-workspace"), gutter=document.querySelector("#line-gutter"), ownerLabels=document.querySelector("#owner-labels");
const modeToggle=document.querySelector("#mode-toggle"), passwordDialog=document.querySelector("#password-dialog"), identityDialog=document.querySelector("#identity-dialog");
const compactToggle=document.querySelector("#compact-toggle"), fontFamily=document.querySelector("#font-family"), fontSize=document.querySelector("#font-size");
let password=sessionStorage.getItem(`rustpad:pad:${slug}:password`)||"", nickname=getNickname(), info, socket, saveTimer, applyingRemote=false, uiState=readEditorState(), owners=[];
const lineToggle=document.querySelector("#line-numbers-toggle"); lineToggle.checked=localStorage.getItem("rustpad:line-numbers")!=="off";
compactToggle.checked=localStorage.getItem("rustpad:compact")==="on";
fontFamily.value=localStorage.getItem("rustpad:font-family")||"mono";
fontSize.value=localStorage.getItem("rustpad:font-size")||"18";
function colorFor(name){let h=0;for(const c of name||"?")h=(h*31+c.charCodeAt(0))%360;return `hsl(${h} 70% 62%)`;}
function toast(text){const el=document.querySelector("#toast");el.textContent=text;el.classList.add("visible");setTimeout(()=>el.classList.remove("visible"),1800);}
function setStatus(kind,text){document.querySelector("#status-dot").className=`status__dot${kind?` is-${kind}`:""}`;document.querySelector("#status-text").textContent=text;}
function updateAddressLabel(){document.querySelector("#pad-url").textContent=`${location.pathname}${location.search}`;}
async function renderMermaid(){const nodes=preview.querySelectorAll(".mermaid");if(!nodes.length)return;try{const {default:mermaid}=await import("https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs");mermaid.initialize({startOnLoad:false,theme:"dark",securityLevel:"strict"});await mermaid.run({nodes:[...nodes]});}catch{nodes.forEach(n=>n.insertAdjacentHTML("beforebegin",'<p class="error">Failed to load Mermaid.</p>'));}}
function renderGutter(){
  const lineCount=Math.max(1,(editor.value.match(/\n/g)||[]).length+1);
  const lines=Array.from({length:lineCount});
  owners=owners.slice(0,lineCount);
  while(owners.length<lineCount)owners.push(owners.at(-1)||nickname||"");
  const style=getComputedStyle(editor), lineHeight=parseFloat(style.lineHeight)||29, paddingTop=parseFloat(style.paddingTop)||24, paddingBottom=parseFloat(style.paddingBottom)||24;
  gutter.style.paddingTop=`${paddingTop}px`;gutter.style.paddingBottom=`${paddingBottom}px`;gutter.style.lineHeight=`${lineHeight}px`;
  gutter.innerHTML=lines.map((_,i)=>`<div style="height:${lineHeight}px">${i+1}</div>`).join("");
  ownerLabels.style.setProperty("--editor-line-height",`${lineHeight}px`);
  ownerLabels.innerHTML=lines.map((_,i)=>{
    const owner=owners[i]||"";
    if(!owner)return "";
    const top=paddingTop+i*lineHeight-editor.scrollTop;
    const label=owner!==owners[i-1]?`<span class="owner-label" style="top:${top}px;--owner:${colorFor(owner)}">${escapeHtml(owner)}</span>`:"";
    return `<span class="owner-line" style="top:${top}px;--owner:${colorFor(owner)}"></span>${label}`;
  }).join("");
  document.body.classList.toggle("hide-line-numbers",!lineToggle.checked);
}
function escapeHtml(v){return String(v).replace(/[&<>"']/g,c=>({"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#039;"}[c]));}function formatDate(value){const raw=String(value??"").trim();let normalized=raw;if(/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}(?:\.\d+)?[+-]\d{2}$/.test(normalized))normalized=normalized.replace(" ","T")+":00";else if(/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}(?:\.\d+)?[+-]\d{2}:\d{2}$/.test(normalized))normalized=normalized.replace(" ","T");else if(/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}(?:\.\d+)?$/.test(normalized))normalized=normalized.replace(" ","T")+"Z";const date=new Date(normalized);return Number.isNaN(date.getTime())?raw:date.toLocaleString("pl-PL",{year:"numeric",month:"2-digit",day:"2-digit",hour:"2-digit",minute:"2-digit",second:"2-digit"});}
function render(){if(uiState.mode==="markdown"){preview.classList.remove("preview--raw");preview.innerHTML=renderMarkdown(editor.value);document.querySelector("#preview-label").textContent="Markdown + Mermaid preview";renderMermaid();}else{preview.classList.add("preview--raw");preview.textContent=editor.value;document.querySelector("#preview-label").textContent="Source text";}document.querySelector("#characters").textContent=`${editor.value.length} characters`;document.querySelector("#words").textContent=`${editor.value.trim()?editor.value.trim().split(/\s+/).length:0} words`;renderGutter();}
function applyUi({write=false,replace=false}={}){editorWorkspace.className=`workspace view-${uiState.view} editor-workspace-font-${fontFamily.value}`;editorWorkspace.style.setProperty("--editor-font-size",`${fontSize.value}px`);document.body.classList.toggle("compact-editor",compactToggle.checked);document.querySelectorAll("[data-view]").forEach(b=>{const a=b.dataset.view===uiState.view;b.classList.toggle("active",a);b.setAttribute("aria-pressed",String(a));});const markdown=uiState.mode==="markdown";modeToggle.classList.toggle("active",markdown);modeToggle.textContent=markdown?"Markdown":"Text";render();if(write)writeEditorState(uiState,{replace});updateAddressLabel();}
function applyRemote(content,ownerMap){if(content===editor.value&&ownerMap==null)return;const start=editor.selectionStart,end=editor.selectionEnd;applyingRemote=true;editor.value=content;try{owners=JSON.parse(ownerMap||"[]");}catch{owners=[];}editor.setSelectionRange(Math.min(start,content.length),Math.min(end,content.length));applyingRemote=false;render();}

async function loadFiles({open=false}={}){
  try{
    const files=await api(`/api/pads/${encodeURIComponent(slug)}/files`,{method:"PUT",body:JSON.stringify({password:password||null})});
    document.querySelector("#footer-files").textContent=`${files.length} ${files.length===1?"file":"files"}`;
    document.querySelector("#files-list").innerHTML=files.length?files.map(file=>`<div class="file-row" data-file-row="${file.id}"><div class="file-row-main"><div class="file-name">${escapeHtml(file.filename)}</div><div class="file-meta">${escapeHtml(file.mime_type)} · ${Math.max(1,Math.round(file.size_bytes/1024))} KB · ${formatDate(file.created_at)} · <span class="file-flag${file.is_attached?"":" detached"}">${file.is_attached?"in note":"removed from content"}</span></div></div><div class="file-actions"><button data-show-file-code="link" data-url="${escapeHtml(file.url)}" data-name="${escapeHtml(file.filename)}" data-mime="${escapeHtml(file.mime_type)}">Link</button><button data-show-file-code="markdown" data-url="${escapeHtml(file.url)}" data-name="${escapeHtml(file.filename)}" data-mime="${escapeHtml(file.mime_type)}">Markdown</button><button data-show-file-code="html" data-url="${escapeHtml(file.url)}" data-name="${escapeHtml(file.filename)}" data-mime="${escapeHtml(file.mime_type)}">HTML</button></div><div class="file-code" hidden><textarea readonly aria-label="Generated file code"></textarea><button data-copy-generated>Copy</button></div></div>`).join(""):'<p class="dialog-copy">No files uploaded.</p>';
    if(open)document.querySelector("#files-dialog").showModal();
  }catch(error){if(open)toast(error.message);}
}
function connect(){socket?.stop();socket=new PadSocket({slug,password,nickname,onStatus:s=>setStatus(s==="online"?"online":s==="offline"?"offline":null,s==="online"?"Connected":s==="offline"?"Reconnecting…":"Connecting…"),onAuthenticated:m=>{if(passwordDialog.open)passwordDialog.close();applyRemote(m.content,m.owner_map);editor.focus();},onDocument:m=>{applyRemote(m.content,m.owner_map);document.querySelector("#save-state").textContent=`${m.author?`${m.author} · `:""}${new Date(m.updated_at).toLocaleTimeString("en-US",{hour:"2-digit",minute:"2-digit"})}`;},onError:m=>{document.querySelector("#password-error").textContent=m;if(info?.protected&&!passwordDialog.open)passwordDialog.showModal();}});socket.connect();}
async function initialize(){try{info=await api(`/api/pads/${encodeURIComponent(slug)}`);document.title=`${info.title} · RustPad`;applyUi({write:true,replace:true});if(!nickname){identityDialog.showModal();return;}document.querySelector("#current-user").textContent=nickname;document.querySelector("#current-user").style.setProperty("--owner",colorFor(nickname));if(info.protected&&!password)passwordDialog.showModal();else{loadFiles();connect();}}catch(e){document.body.innerHTML=`<main class="error-page"><div><h1>Note not found</h1><p>${escapeHtml(e.message)}</p></div></main>`;}}
document.querySelector("#identity-form").addEventListener("submit",e=>{e.preventDefault();nickname=document.querySelector("#nickname").value.trim();setNickname(nickname);identityDialog.close();document.querySelector("#current-user").textContent=nickname;document.querySelector("#current-user").style.setProperty("--owner",colorFor(nickname));if(info.protected&&!password)passwordDialog.showModal();else{loadFiles();connect();}});
document.querySelectorAll("[data-view]").forEach(b=>b.addEventListener("click",()=>{uiState={...uiState,view:b.dataset.view};applyUi({write:true});}));modeToggle.addEventListener("click",()=>{uiState={...uiState,mode:uiState.mode==="markdown"?"text":"markdown"};applyUi({write:true});});lineToggle.addEventListener("change",()=>{localStorage.setItem("rustpad:line-numbers",lineToggle.checked?"on":"off");renderGutter();});compactToggle.addEventListener("change",()=>{localStorage.setItem("rustpad:compact",compactToggle.checked?"on":"off");applyUi();});fontFamily.addEventListener("change",()=>{localStorage.setItem("rustpad:font-family",fontFamily.value);applyUi();});fontSize.addEventListener("change",()=>{localStorage.setItem("rustpad:font-size",fontSize.value);applyUi();});
window.addEventListener("popstate",()=>{uiState=readEditorState();applyUi();});window.addEventListener("rustpad:urlchange",updateAddressLabel);document.querySelector("#copy-link").addEventListener("click",async()=>{try{await copyText(currentShareUrl(uiState));toast("Link copied");}catch(e){toast(e.message);}});document.querySelectorAll("[data-format]").forEach(b=>b.addEventListener("click",()=>applyFormat(editor,b.dataset.format)));
document.querySelector("#publish-page").addEventListener("click",async()=>{try{const result=await api(`/api/pads/${encodeURIComponent(slug)}/publish`,{method:"POST",body:JSON.stringify({password:password||null})});const url=new URL(result.url,location.origin).href;await copyText(url);toast("Page link copied");window.open(url,"_blank","noopener");}catch(error){toast(error.message);}});
editor.addEventListener("scroll",()=>{gutter.scrollTop=editor.scrollTop;renderGutter();});editor.addEventListener("input",()=>{const newLines=editor.value.split("\n").length;const cursorLine=editor.value.slice(0,editor.selectionStart).split("\n").length-1;while(owners.length<newLines)owners.push(nickname);owners=owners.slice(0,newLines);owners[cursorLine]=nickname;render();if(applyingRemote)return;clearTimeout(saveTimer);document.querySelector("#save-state").textContent="Saving…";saveTimer=setTimeout(()=>socket?.update(editor.value,JSON.stringify(owners)),250);});
document.querySelector("#password-form").addEventListener("submit",e=>{e.preventDefault();password=document.querySelector("#open-password").value;sessionStorage.setItem(`rustpad:pad:${slug}:password`,password);document.querySelector("#password-error").textContent="";connect();});
const historyPanel=document.querySelector("#history-panel");document.querySelector("#history-button").addEventListener("click",async()=>{historyPanel.classList.add("open");historyPanel.setAttribute("aria-hidden","false");document.body.classList.add("history-open");const list=document.querySelector("#history-list");list.innerHTML='<p class="empty">Loading…</p>';try{const revisions=await api(`/api/pads/${encodeURIComponent(slug)}/history`,{method:"POST",body:JSON.stringify({password:password||null})});list.innerHTML=revisions.length?revisions.map((r,i)=>{const snippet=escapeHtml(r.content.trim().split("\n").slice(0,3).join(" · ").slice(0,150)||"Empty note");const author=r.author||"Unknown author";return `<article class="revision"><span class="revision__marker" style="--owner:${colorFor(author)}"></span><div><div class="revision__meta"><strong>${escapeHtml(author)}</strong><time>${formatDate(r.created_at)}</time></div><p class="revision__snippet">${snippet}</p><button data-preview="${r.id}">Preview</button><button data-revision="${r.id}">Restore</button><div class="revision__preview" id="preview-${r.id}" hidden></div></div></article>`;}).join(""):'<p class="empty">No history yet.</p>';for(const r of revisions){list.querySelector(`[data-preview="${r.id}"]`)?.addEventListener("click",()=>{const el=list.querySelector(`#preview-${r.id}`);el.hidden=!el.hidden;el.textContent=r.content;});list.querySelector(`[data-revision="${r.id}"]`)?.addEventListener("click",async()=>{await api(`/api/pads/${encodeURIComponent(slug)}/restore`,{method:"POST",body:JSON.stringify({password:password||null,revision_id:r.id})});toast("Version restored");});}}catch(e){list.innerHTML=`<p class="error">${escapeHtml(e.message)}</p>`;}});document.querySelector("#close-history").addEventListener("click",()=>{historyPanel.classList.remove("open");historyPanel.setAttribute("aria-hidden","true");document.body.classList.remove("history-open");});
document.querySelector("#upload-button").addEventListener("click",()=>document.querySelector("#file-input").click());document.querySelector("#file-input").addEventListener("change",async e=>{let file=e.target.files[0];if(!file)return;if(file.type.startsWith("image/")){file=await prepareImageFile(file);if(!file){e.target.value="";return;}}const form=new FormData();form.append("password",password||"");form.append("file",file);try{const result=await api(`/api/pads/${encodeURIComponent(slug)}/files`,{method:"POST",body:form,headers:{}});const image=file.type.startsWith("image/");const text=image?`![${file.name}](${result.url})`:`[${file.name}](${result.url})`;editor.setRangeText(text,editor.selectionStart,editor.selectionEnd,"end");editor.dispatchEvent(new Event("input"));toast("File uploaded");loadFiles();}catch(err){toast(err.message);}e.target.value="";});

document.querySelector("#files-button").addEventListener("click",()=>loadFiles({open:true}));
document.querySelector("#footer-files").addEventListener("click",()=>loadFiles({open:true}));
document.querySelector("#close-files").addEventListener("click",()=>document.querySelector("#files-dialog").close());
document.querySelector("#files-list").addEventListener("click",async event=>{
  const showButton=event.target.closest("[data-show-file-code]");
  if(showButton){
    const row=showButton.closest(".file-row"), panel=row.querySelector(".file-code"), output=panel.querySelector("textarea");
    const absolute=new URL(showButton.dataset.url,location.origin).href;
    let text=absolute;
    if(showButton.dataset.showFileCode==="markdown")text=showButton.dataset.mime?.startsWith("image/")?`![${showButton.dataset.name}](${absolute})`:`[${showButton.dataset.name}](${absolute})`;
    if(showButton.dataset.showFileCode==="html")text=(showButton.dataset.mime||"").startsWith("image/")?`<img src="${absolute}" alt="${showButton.dataset.name}">`:`<a href="${absolute}">${showButton.dataset.name}</a>`;
    output.value=text;panel.hidden=false;output.focus();output.select();return;
  }
  const copyButton=event.target.closest("[data-copy-generated]");
  if(copyButton){try{await copyText(copyButton.closest(".file-code").querySelector("textarea").value);toast("Copied");}catch(error){toast(error.message);}return;}
});
initialize();