/**
 * GET /api/v1/admin/users
 *
 * List all users with pagination.
 *
 * Query Parameters:
 *   - limit: number (default: 50, max: 250)
 *   - offset: number (default: 0)
 *
 * Response: AdminListResponse<AdminUser>
 */

import { db } from '@sim/db'
import { user } from '@sim/db/schema'
import { createLogger } from '@sim/logger'
import { count } from 'drizzle-orm'
import { adminV1ListUsersContract } from '@/lib/api/contracts/v1/admin'
import { parseRequest } from '@/lib/api/server'
import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
import { withAdminAuth } from '@/app/api/v1/admin/middleware'
import {
  adminValidationErrorResponse,
  internalErrorResponse,
  listResponse,
} from '@/app/api/v1/admin/responses'
import { type AdminUser, createPaginationMeta, toAdminUser } from '@/app/api/v1/admin/types'

const logger = createLogger('AdminUsersAPI')

export const GET = withRouteHandler(
  withAdminAuth(async (request) => {
    const parsed = await parseRequest(
      adminV1ListUsersContract,
      request,
      {},
      {
        validationErrorResponse: adminValidationErrorResponse,
      }
    )
    if (!parsed.success) return parsed.response

    const { limit, offset } = parsed.data.query

    try {
      const [countResult, users] = await Promise.all([
        db.select({ total: count() }).from(user),
        db.select().from(user).orderBy(user.name).limit(limit).offset(offset),
      ])

      const total = countResult[0].total
      const data: AdminUser[] = users.map(toAdminUser)
      const pagination = createPaginationMeta(total, limit, offset)

      logger.info(`Admin API: Listed ${data.length} users (total: ${total})`)

      return listResponse(data, pagination)
    } catch (error) {
      logger.error('Admin API: Failed to list users', { error })
      return internalErrorResponse('Failed to list users')
    }
  })
)