// server/supabase/functions/admin-users/index.ts
// Admin: 유저 목록/상세 조회 + super_admin: role 변경

import { corsHeaders, handleCorsPreflightRequest } from '../_shared/cors.ts'
import { authErrorResponse, type AuthError } from '../_shared/auth.ts'
import { requireAdmin, requireSuperAdmin } from '../_shared/admin-auth.ts'
import { createServiceRoleClient } from '../_shared/quota.ts'
import { writeAuditLog } from '../_shared/audit.ts'

// @ts-expect-error — Deno 런타임 import
import { createClient } from 'https://esm.sh/@supabase/supabase-js@2.39.7'

function jsonResponse(body: Record<string, unknown> | Record<string, unknown>[], status = 200): Response {
  return new Response(JSON.stringify(body), {
    status,
    headers: { ...corsHeaders, 'Content-Type': 'application/json' },
  })
}

interface RoleChangeBody {
  userId: string
  newRole: 'user' | 'admin' | 'super_admin'
  memo: string
}

// @ts-expect-error — Deno 런타임 전역
Deno.serve(async (req: Request) => {
  const preflight = handleCorsPreflightRequest(req)
  if (preflight) return preflight

  try {
    const url = new URL(req.url)

    // ── GET: 유저 목록/상세 ──
    if (req.method === 'GET') {
      const admin = await requireAdmin(req)
      const serviceClient = createServiceRoleClient()

      const userId = url.searchParams.get('userId')

      if (userId) {
        // 유저 상세
        const { data: profile, error } = await serviceClient
          .from('profiles')
          .select('id, name, avatar_url, locale, tier, role, created_at, updated_at')
          .eq('id', userId)
          .maybeSingle()

        if (error) return jsonResponse({ error: error.message }, 500)
        if (!profile) return jsonResponse({ error: 'User not found' }, 404)

        const { data: sub } = await serviceClient
          .from('subscriptions')
          .select('*')
          .eq('user_id', userId)
          .maybeSingle()

        return jsonResponse({ profile, subscription: sub })
      }

      // 유저 목록
      const page = parseInt(url.searchParams.get('page') ?? '1', 10)
      const limit = parseInt(url.searchParams.get('limit') ?? '20', 10)
      const search = url.searchParams.get('search') ?? ''
      const roleFilter = url.searchParams.get('role') ?? ''
      const from = (page - 1) * limit
      const to = from + limit - 1

      let query = serviceClient
        .from('profiles')
        .select('id, name, avatar_url, tier, role, created_at', { count: 'exact' })

      if (search) {
        query = query.ilike('name', `%${search}%`)
      }
      if (roleFilter) {
        query = query.eq('role', roleFilter)
      }

      const { data: profiles, count, error } = await query
        .order('created_at', { ascending: false })
        .range(from, to)

      if (error) return jsonResponse({ error: error.message }, 500)

      return jsonResponse({ profiles: profiles ?? [], total: count ?? 0, page, limit })
    }

    // ── PATCH: role 변경 (super_admin 전용) ──
    if (req.method === 'PATCH') {
      const admin = await requireSuperAdmin(req)
      const body = (await req.json()) as RoleChangeBody
      const serviceClient = createServiceRoleClient()

      if (!body.userId || !body.newRole || !body.memo) {
        return jsonResponse({ error: 'userId, newRole, memo are required' }, 400)
      }

      const validRoles = ['user', 'admin', 'super_admin']
      if (!validRoles.includes(body.newRole)) {
        return jsonResponse({ error: `Invalid role. Must be one of: ${validRoles.join(', ')}` }, 400)
      }

      // 현재 프로필 조회 (before 스냅샷)
      const { data: before } = await serviceClient
        .from('profiles')
        .select('id, name, role')
        .eq('id', body.userId)
        .maybeSingle()

      if (!before) return jsonResponse({ error: 'User not found' }, 404)

      // 1. auth.users.raw_app_meta_data.role 변경
      const { error: authError } = await serviceClient.auth.admin.updateUserById(body.userId, {
        app_metadata: { role: body.newRole },
      })
      if (authError) return jsonResponse({ error: `Auth update failed: ${authError.message}` }, 500)

      // 2. profiles.role 동기화
      const { error: profileError } = await serviceClient
        .from('profiles')
        .update({ role: body.newRole, updated_at: new Date().toISOString() })
        .eq('id', body.userId)

      if (profileError) return jsonResponse({ error: `Profile update failed: ${profileError.message}` }, 500)

      // 3. 감사로그
      await writeAuditLog(serviceClient, {
        adminId: admin.id,
        action: 'user.role_change',
        targetType: 'profile',
        targetId: body.userId,
        beforeData: { role: before.role },
        afterData: { role: body.newRole },
        memo: body.memo,
      })

      return jsonResponse({ success: true, userId: body.userId, newRole: body.newRole })
    }

    return jsonResponse({ error: 'Method not allowed' }, 405)
  } catch (err) {
    if (err && typeof err === 'object' && 'status' in err && 'message' in err) {
      return authErrorResponse(err as AuthError, corsHeaders)
    }
    const message = err instanceof Error ? err.message : 'Unknown error'
    return jsonResponse({ error: message }, 500)
  }
})