#[derive(Debug, Deserialize)]
struct AutomationInput {
    name: String,
    #[serde(default = "yes")]
    enabled: bool,
    trigger_kind: String,
    #[serde(default)]
    trigger_device_id: Option<String>,
    #[serde(default)]
    threshold: Option<f64>,
    #[serde(default)]
    at_time: Option<String>,
    #[serde(default)]
    action_device_id: String,
    #[serde(default)]
    action_group_id: Option<String>,
    #[serde(default)]
    action_preset: Option<String>,
    #[serde(default)]
    action: DeviceCommand,
    #[serde(default = "automation_cooldown")]
    cooldown_seconds: u64,
}
fn automation_cooldown() -> u64 {
    300
}
impl AutomationInput {
    fn validate(&self) -> Result<(), AppError> {
        if self.name.trim().is_empty() {
            return Err(AppError::BadRequest("automation name is required".into()));
        }
        match self.trigger_kind.as_str() {
            "temperature_above" | "temperature_below" => {
                if self
                    .trigger_device_id
                    .as_deref()
                    .unwrap_or_default()
                    .is_empty()
                    || self.threshold.is_none()
                {
                    return Err(AppError::BadRequest(
                        "temperature trigger needs device and threshold".into(),
                    ));
                }
            }
            "time" => {
                let at = self
                    .at_time
                    .as_deref()
                    .ok_or_else(|| AppError::BadRequest("time trigger needs at_time".into()))?;
                chrono::NaiveTime::parse_from_str(at, "%H:%M")
                    .map_err(|_| AppError::BadRequest("invalid automation time".into()))?;
            }
            _ => {
                return Err(AppError::BadRequest(
                    "unsupported automation trigger".into(),
                ))
            }
        }
        let action_group_id = self
            .action_group_id
            .as_deref()
            .map(str::trim)
            .filter(|value| !value.is_empty());
        if action_group_id.is_none() && self.action_device_id.trim().is_empty() {
            return Err(AppError::BadRequest(
                "automation action needs a device or group".into(),
            ));
        }
        if let Some(preset) = self
            .action_preset
            .as_deref()
            .map(str::trim)
            .filter(|value| !value.is_empty())
        {
            if action_group_id.is_none() {
                return Err(AppError::BadRequest(
                    "automation preset actions require a group target".into(),
                ));
            }
            if !matches!(preset, "auto" | "comfort" | "sleep" | "away") {
                return Err(AppError::BadRequest(
                    "unsupported group automation preset".into(),
                ));
            }
        }
        if action_group_id.is_some() {
            if let Some(mode) = self.action.mode.as_deref() {
                if !matches!(mode, "auto" | "house" | "cool" | "heat") {
                    return Err(AppError::BadRequest(
                        "group automation mode must be house, cool or heat".into(),
                    ));
                }
            }
            if self.action.target_temperature.is_some()
                || self.action.fan_speed.is_some()
                || self.action.swing_vertical.is_some()
                || self.action.swing_horizontal.is_some()
                || self.action.quiet.is_some()
                || self.action.turbo.is_some()
                || self.action.light.is_some()
                || self.action.air.is_some()
                || self.action.xfan.is_some()
                || self.action.health.is_some()
                || self.action.sleep.is_some()
            {
                return Err(AppError::BadRequest(
                    "group automations support only power, heat/cool/house mode and a group preset"
                        .into(),
                ));
            }
            if self.action.power.is_none()
                && self.action.mode.is_none()
                && self
                    .action_preset
                    .as_deref()
                    .map(str::trim)
                    .filter(|v| !v.is_empty())
                    .is_none()
            {
                return Err(AppError::BadRequest(
                    "group automation action cannot be empty".into(),
                ));
            }
        } else {
            engine::validate_command(&self.action)?;
            if self.action.is_empty() {
                return Err(AppError::BadRequest(
                    "automation action cannot be empty".into(),
                ));
            }
        }
        Ok(())
    }
    fn into_automation(
        self,
        id: String,
        created_at: chrono::DateTime<Utc>,
        last_fired_at: Option<chrono::DateTime<Utc>>,
    ) -> Automation {
        Automation {
            id,
            name: self.name.trim().into(),
            enabled: self.enabled,
            trigger_kind: self.trigger_kind,
            trigger_device_id: self
                .trigger_device_id
                .map(|value| value.trim().to_string())
                .filter(|value| !value.is_empty()),
            threshold: self.threshold,
            at_time: self.at_time,
            action_device_id: self.action_device_id.trim().to_string(),
            action_group_id: self
                .action_group_id
                .map(|value| value.trim().to_string())
                .filter(|value| !value.is_empty()),
            action_preset: self
                .action_preset
                .map(|value| value.trim().to_string())
                .filter(|value| !value.is_empty()),
            action: self.action,
            cooldown_seconds: self.cooldown_seconds.max(30),
            last_fired_at,
            action_zone_id: None,
            action_zone_preset: None,
            action_ha_domain: None,
            action_ha_service: None,
            action_ha_entity_id: None,
            action_ha_data: Value::Null,
            flow_conditions: vec![],
            flow_id: None,
            flow_node_id: None,
            flow_runtime: Default::default(),
            created_at,
            updated_at: Utc::now(),
        }
    }
}
fn validate_automation_references(
    state: &AppState,
    input: &AutomationInput,
) -> Result<(), AppError> {
    if matches!(
        input.trigger_kind.as_str(),
        "temperature_above" | "temperature_below"
    ) {
        let trigger_id = input
            .trigger_device_id
            .as_deref()
            .map(str::trim)
            .unwrap_or_default();
        if state.db.get_device(trigger_id)?.is_none() {
            return Err(AppError::BadRequest(
                "automation trigger device does not exist".into(),
            ));
        }
    }
    if let Some(group_id) = input
        .action_group_id
        .as_deref()
        .map(str::trim)
        .filter(|value| !value.is_empty())
    {
        if state.db.get_group(group_id)?.is_none() {
            return Err(AppError::BadRequest(
                "automation action group does not exist".into(),
            ));
        }
    } else {
        let device_id = input.action_device_id.trim();
        if state.db.get_device(device_id)?.is_none() {
            return Err(AppError::BadRequest(
                "automation action device does not exist".into(),
            ));
        }
        if engine::automation_action_conflicts_with_thermostat(&input.action)
            && state
                .db
                .list_zones()?
                .iter()
                .any(|zone| zone.enabled && zone.device_id == device_id)
        {
            return Err(AppError::BadRequest(
                "direct fan/quiet/sleep automation conflicts with an enabled thermostat zone; use thermostat/group policy instead".into(),
            ));
        }
    }
    Ok(())
}

async fn list_automations(
    State(state): State<AppState>,
) -> Result<Json<Vec<Automation>>, AppError> {
    Ok(Json(state.db.list_automations()?))
}
async fn get_automation(
    State(state): State<AppState>,
    Path(id): Path<String>,
) -> Result<Json<Automation>, AppError> {
    state
        .db
        .get_automation(&id)?
        .map(Json)
        .ok_or_else(|| AppError::NotFound(format!("automation {id}")))
}
async fn create_automation(
    State(state): State<AppState>,
    Json(input): Json<AutomationInput>,
) -> Result<(StatusCode, Json<Automation>), AppError> {
    let _configuration_guard = state.lock_configuration_operation().await;
    let _automation_guard = state.lock_automation_operation().await;
    input.validate()?;
    let action_group_id = input
        .action_group_id
        .as_deref()
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .map(str::to_string);
    let _group_guard = if let Some(group_id) = action_group_id.as_deref() {
        Some(state.lock_group_operation(group_id).await)
    } else {
        None
    };
    validate_automation_references(&state, &input)?;
    let item = input.into_automation(Uuid::new_v4().to_string(), Utc::now(), None);
    state.db.save_automation(&item)?;
    state.broadcast("automation.created", serde_json::to_value(&item)?);
    Ok((StatusCode::CREATED, Json(item)))
}
async fn update_automation(
    State(state): State<AppState>,
    Path(id): Path<String>,
    Json(input): Json<AutomationInput>,
) -> Result<Json<Automation>, AppError> {
    let _configuration_guard = state.lock_configuration_operation().await;
    let _automation_guard = state.lock_automation_operation().await;
    input.validate()?;
    let existing = state
        .db
        .get_automation(&id)?
        .ok_or_else(|| AppError::NotFound(format!("automation {id}")))?;
    if existing.flow_id.is_some() {
        return Err(AppError::BadRequest(
            "this automation is generated by Flow; edit it in the Flow editor".into(),
        ));
    }
    let action_group_id = input
        .action_group_id
        .as_deref()
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .map(str::to_string);
    let _group_guard = if let Some(group_id) = action_group_id.as_deref() {
        Some(state.lock_group_operation(group_id).await)
    } else {
        None
    };
    validate_automation_references(&state, &input)?;
    let item = input.into_automation(id, existing.created_at, existing.last_fired_at);
    state.db.save_automation(&item)?;
    state.broadcast("automation.updated", serde_json::to_value(&item)?);
    Ok(Json(item))
}
async fn delete_automation(
    State(state): State<AppState>,
    Path(id): Path<String>,
) -> Result<StatusCode, AppError> {
    let _configuration_guard = state.lock_configuration_operation().await;
    let _automation_guard = state.lock_automation_operation().await;
    let existing = state
        .db
        .get_automation(&id)?
        .ok_or_else(|| AppError::NotFound(format!("automation {id}")))?;
    if existing.flow_id.is_some() {
        return Err(AppError::BadRequest(
            "this automation is generated by Flow; delete it from the Flow editor".into(),
        ));
    }
    if !state.db.delete_automation(&id)? {
        return Err(AppError::NotFound(format!("automation {id}")));
    }
    state.broadcast("automation.deleted", json!({"id": id}));
    Ok(StatusCode::NO_CONTENT)
}