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/**
 * Settings REST API
 *
 * GET  /api/settings            โ€” ่Žทๅ–ๅˆๅนถๅŽ็š„่ฎพ็ฝฎ
 * GET  /api/settings/user       โ€” ่Žทๅ–็”จๆˆท่ฎพ็ฝฎ
 * GET  /api/settings/project    โ€” ่Žทๅ–้กน็›ฎ่ฎพ็ฝฎ
 * PUT  /api/settings/user       โ€” ๆ›ดๆ–ฐ็”จๆˆท่ฎพ็ฝฎ
 * PUT  /api/settings/project    โ€” ๆ›ดๆ–ฐ้กน็›ฎ่ฎพ็ฝฎ
 * GET  /api/permissions/mode    โ€” ่Žทๅ–ๆƒ้™ๆจกๅผ
 * PUT  /api/permissions/mode    โ€” ่ฎพ็ฝฎๆƒ้™ๆจกๅผ
 */

import { SettingsService } from '../services/settingsService.js'
import { ApiError, errorResponse } from '../middleware/errorHandler.js'
import { ensureDesktopCliLauncherInstalled } from '../services/desktopCliLauncherService.js'
import { conversationService } from '../services/conversationService.js'

const settingsService = new SettingsService()

export async function handleSettingsApi(
  req: Request,
  url: URL,
  segments: string[],
): Promise<Response> {
  try {
    const resource = segments[1] // 'settings' | 'permissions'
    const sub = segments[2] // 'user' | 'project' | 'mode' | undefined

    // โ”€โ”€ /api/permissions/* โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
    if (resource === 'permissions') {
      if (sub === 'mode') {
        return await handlePermissionMode(req)
      }
      throw ApiError.notFound(`Unknown permissions endpoint: ${sub}`)
    }

    // โ”€โ”€ /api/settings/* โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
    const method = req.method

    switch (sub) {
      case undefined:
        // GET /api/settings
        if (method !== 'GET') throw methodNotAllowed(method)
        return Response.json(await settingsService.getSettings())

      case 'user':
        return await handleUserSettings(req)

      case 'project':
        return await handleProjectSettings(req, url)

      case 'cli-launcher':
        if (method !== 'GET') throw methodNotAllowed(method)
        return Response.json(await ensureDesktopCliLauncherInstalled())

      default:
        throw ApiError.notFound(`Unknown settings endpoint: ${sub}`)
    }
  } catch (error) {
    return errorResponse(error)
  }
}

// โ”€โ”€โ”€ Handlers โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€

async function handleUserSettings(req: Request): Promise<Response> {
  if (req.method === 'GET') {
    return Response.json(await settingsService.getUserSettings())
  }

  if (req.method === 'PUT') {
    const body = await parseJsonBody(req)
    await settingsService.updateUserSettings(body)
    syncThinkingSettingToActiveSessions(body)
    return Response.json({ ok: true })
  }

  throw methodNotAllowed(req.method)
}

async function handleProjectSettings(req: Request, url: URL): Promise<Response> {
  const projectRoot = url.searchParams.get('projectRoot') || undefined

  if (req.method === 'GET') {
    return Response.json(await settingsService.getProjectSettings(projectRoot))
  }

  if (req.method === 'PUT') {
    const body = await parseJsonBody(req)
    await settingsService.updateProjectSettings(body, projectRoot)
    return Response.json({ ok: true })
  }

  throw methodNotAllowed(req.method)
}

async function handlePermissionMode(req: Request): Promise<Response> {
  if (req.method === 'GET') {
    const mode = await settingsService.getPermissionMode()
    return Response.json({ mode })
  }

  if (req.method === 'PUT') {
    const body = await parseJsonBody(req)
    const mode = body.mode
    if (typeof mode !== 'string') {
      throw ApiError.badRequest('Missing or invalid "mode" in request body')
    }
    await settingsService.setPermissionMode(mode)
    return Response.json({ ok: true, mode })
  }

  throw methodNotAllowed(req.method)
}

// โ”€โ”€โ”€ Helpers โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€

async function parseJsonBody(req: Request): Promise<Record<string, unknown>> {
  try {
    return (await req.json()) as Record<string, unknown>
  } catch {
    throw ApiError.badRequest('Invalid JSON body')
  }
}

function methodNotAllowed(method: string): ApiError {
  return new ApiError(405, `Method ${method} not allowed`, 'METHOD_NOT_ALLOWED')
}

function syncThinkingSettingToActiveSessions(settings: Record<string, unknown>): void {
  if (
    !Object.prototype.hasOwnProperty.call(settings, 'alwaysThinkingEnabled') ||
    typeof settings.alwaysThinkingEnabled !== 'boolean'
  ) {
    return
  }

  conversationService.setMaxThinkingTokensForActiveSessions(
    settings.alwaysThinkingEnabled ? null : 0,
  )
}