<?php

declare(strict_types=1);

namespace App\Http\Controllers\Moderation;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Inertia\Inertia;
use Inertia\Response;

final class UsernameQueueController extends Controller
{
    public function index(Request $request): Response
    {
        $filters = [
            'q' => trim((string) $request->query('q', '')),
            'status' => trim((string) $request->query('status', 'pending')),
        ];

        $requestColumns = Schema::hasTable('username_approval_requests')
            ? Schema::getColumnListing('username_approval_requests')
            : [];

        $query = DB::table('username_approval_requests as requests')
            ->leftJoin('users', 'users.id', '=', 'requests.user_id')
            ->select([
                'requests.id',
                'requests.user_id',
                'requests.requested_username',
                'requests.status',
                'requests.context',
                'requests.similar_to',
                'requests.review_note',
                'requests.reviewed_at',
                'requests.created_at',
                'users.username as current_username',
                'users.name as current_name',
            ])
            ->orderByDesc('requests.created_at');

        if ($filters['status'] !== '' && $filters['status'] !== 'all') {
            $query->where('requests.status', $filters['status']);
        }

        if ($filters['q'] !== '') {
            $search = $filters['q'];
            $query->where(function ($builder) use ($search): void {
                $builder
                    ->where('requests.requested_username', 'like', '%' . $search . '%')
                    ->orWhere('requests.context', 'like', '%' . $search . '%')
                    ->orWhere('users.username', 'like', '%' . $search . '%')
                    ->orWhere('users.name', 'like', '%' . $search . '%');
            });
        }

        $requests = $query->paginate(20)->withQueryString()->through(function ($row): array {
            return [
                'id' => (int) $row->id,
                'user_id' => $row->user_id !== null ? (int) $row->user_id : null,
                'requested_username' => (string) $row->requested_username,
                'status' => (string) ($row->status ?? 'pending'),
                'context' => $row->context ?? null,
                'similar_to' => $row->similar_to ?? null,
                'review_note' => $row->review_note ?? null,
                'reviewed_at' => $this->serializeTimestamp($row->reviewed_at ?? null),
                'created_at' => $this->serializeTimestamp($row->created_at ?? null),
                'current_username' => $row->current_username,
                'current_name' => $row->current_name,
                'approve_url' => route('api.admin.usernames.approve', ['id' => $row->id]),
                'reject_url' => route('api.admin.usernames.reject', ['id' => $row->id]),
            ];
        });

        $stats = [
            'total' => Schema::hasTable('username_approval_requests') ? DB::table('username_approval_requests')->count() : 0,
            'pending' => Schema::hasTable('username_approval_requests') ? DB::table('username_approval_requests')->where('status', 'pending')->count() : 0,
            'approved' => Schema::hasTable('username_approval_requests') ? DB::table('username_approval_requests')->where('status', 'approved')->count() : 0,
            'rejected' => Schema::hasTable('username_approval_requests') ? DB::table('username_approval_requests')->where('status', 'rejected')->count() : 0,
        ];

        return Inertia::render('Moderation/UsernameQueue', [
            'title' => 'Username Queue',
            'requests' => $requests,
            'stats' => $stats,
            'filters' => $filters,
            'options' => [
                'statuses' => [
                    ['value' => 'all', 'label' => 'All statuses'],
                    ['value' => 'pending', 'label' => 'Pending'],
                    ['value' => 'approved', 'label' => 'Approved'],
                    ['value' => 'rejected', 'label' => 'Rejected'],
                ],
            ],
            'endpoints' => [
                'index' => route('admin.usernames'),
                'refresh' => route('admin.usernames'),
            ],
        ])->rootView('moderation');
    }

    private function serializeTimestamp(mixed $value): ?string
    {
        if ($value === null || $value === '') {
            return null;
        }

        try {
            return \Illuminate\Support\Carbon::parse((string) $value)->toIso8601String();
        } catch (\Throwable) {
            return null;
        }
    }
}