<?php

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class TenantUserApiController extends Controller
{
    /**
     * 테넌트 사용자 검색 (결재라인 담당자 선택용)
     */
    public function search(Request $request): JsonResponse
    {
        $tenantId = session('selected_tenant_id');
        $query = $request->input('q', '');

        $users = DB::table('users')
            ->join('user_tenants', function ($join) use ($tenantId) {
                $join->on('users.id', '=', 'user_tenants.user_id')
                    ->where('user_tenants.tenant_id', $tenantId)
                    ->where('user_tenants.is_active', true);
            })
            ->leftJoin('tenant_user_profiles as tp', function ($join) use ($tenantId) {
                $join->on('tp.user_id', '=', 'users.id')
                    ->where('tp.tenant_id', $tenantId);
            })
            ->leftJoin('departments', 'departments.id', '=', 'tp.department_id')
            ->whereNull('users.deleted_at')
            ->where(function ($q) {
                $q->whereNull('tp.employee_status')
                    ->orWhere('tp.employee_status', '!=', 'resigned');
            })
            ->when($query, function ($q) use ($query) {
                $q->where(function ($sub) use ($query) {
                    $sub->where('users.name', 'like', "%{$query}%")
                        ->orWhere('departments.name', 'like', "%{$query}%");
                });
            })
            ->orderBy('users.name')
            ->limit(30)
            ->select([
                'users.id',
                'users.name',
                'departments.name as department',
                'tp.position_key as position',
            ])
            ->get();

        return response()->json([
            'success' => true,
            'data' => $users,
        ]);
    }

    /**
     * 테넌트 전체 인원 목록 (부서별 그룹핑, 결재선 에디터용)
     */
    public function list(): JsonResponse
    {
        $tenantId = session('selected_tenant_id');

        $users = DB::table('users')
            ->join('user_tenants', function ($join) use ($tenantId) {
                $join->on('users.id', '=', 'user_tenants.user_id')
                    ->where('user_tenants.tenant_id', $tenantId)
                    ->where('user_tenants.is_active', true);
            })
            ->leftJoin('tenant_user_profiles as tp', function ($join) use ($tenantId) {
                $join->on('tp.user_id', '=', 'users.id')
                    ->where('tp.tenant_id', $tenantId);
            })
            ->leftJoin('departments', 'departments.id', '=', 'tp.department_id')
            ->leftJoin('positions as pos_rank', function ($join) use ($tenantId) {
                $join->on('pos_rank.tenant_id', '=', DB::raw($tenantId))
                    ->where('pos_rank.type', 'rank')
                    ->whereRaw('pos_rank.`key` COLLATE utf8mb4_unicode_ci = tp.position_key COLLATE utf8mb4_unicode_ci');
            })
            ->leftJoin('positions as pos_title', function ($join) use ($tenantId) {
                $join->on('pos_title.tenant_id', '=', DB::raw($tenantId))
                    ->where('pos_title.type', 'title')
                    ->whereRaw('pos_title.`key` COLLATE utf8mb4_unicode_ci = tp.job_title_key COLLATE utf8mb4_unicode_ci');
            })
            ->whereNull('users.deleted_at')
            ->whereNotNull('tp.department_id')
            ->where(function ($q) {
                $q->whereNull('tp.employee_status')
                    ->orWhere('tp.employee_status', '!=', 'resigned');
            })
            ->when($tenantId == 1, function ($q) {
                $q->where('departments.name', '!=', '영업팀');
            })
            ->orderBy('departments.name')
            ->orderByRaw('COALESCE(pos_rank.sort_order, pos_title.sort_order, 9999) ASC')
            ->orderBy('users.name')
            ->select([
                'users.id',
                'users.name',
                'tp.department_id',
                'departments.name as department_name',
                DB::raw('COALESCE(pos_rank.name, tp.position_key, \'\') as position'),
                DB::raw('COALESCE(pos_title.name, tp.job_title_key, \'\') as job_title'),
            ])
            ->get();

        $grouped = $users->groupBy(fn ($u) => $u->department_id ?? 'none');

        $data = [];
        foreach ($grouped as $deptId => $deptUsers) {
            $first = $deptUsers->first();
            $data[] = [
                'department_id' => $deptId === 'none' ? null : (int) $deptId,
                'department_name' => $deptId === 'none' ? '미배정' : $first->department_name,
                'users' => $deptUsers->map(fn ($u) => [
                    'id' => $u->id,
                    'name' => $u->name,
                    'position' => $u->position,
                    'job_title' => $u->job_title,
                ])->values()->toArray(),
            ];
        }

        // 미배정 그룹을 마지막으로
        usort($data, function ($a, $b) {
            if ($a['department_id'] === null) {
                return 1;
            }
            if ($b['department_id'] === null) {
                return -1;
            }

            return strcmp($a['department_name'], $b['department_name']);
        });

        return response()->json([
            'success' => true,
            'data' => $data,
        ]);
    }
}