<?php

namespace App\Http\Controllers\Api\Admin\Transaction;

use App\Enums\TransactionStatus;
use App\Http\Controllers\Controller;
use App\Models\Notification;
use App\Models\Log;
use App\Models\Transaction;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log as FacadesLog;
use Illuminate\Support\Facades\Storage;

class AdminTransactionController extends Controller
{
    public function pendingCount(): JsonResponse
    {
        $count = Transaction::where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->whereNotNull('proof_image')
            ->count();

        return response()->json(['error' => false, 'data' => ['count' => $count]]);
    }

    public function index(Request $request): JsonResponse
    {
        $query = Transaction::with('customer')
            ->where('type', 'manual')
            ->orderByDesc('created_at');

        if ($request->filled('status')) {
            $query->where('status', $request->integer('status'));
        }

        if ($request->filled('filter')) {
            $search = $request->string('filter')->trim();
            $query->where(function ($q) use ($search) {
                $q->where('public_code', 'like', "%{$search}%")
                    ->orWhereHas('customer', fn($c) => $c
                        ->where('fullname', 'like', "%{$search}%")
                        ->orWhere('email', 'like', "%{$search}%"));
            });
        }

        $perPage = $request->integer('per_page', 15);
        $paginated = $query->paginate($perPage);

        $items = $paginated->map(fn(Transaction $t) => [
            'id'           => $t->id,
            'uuid'         => $t->uuid,
            'public_code'  => $t->public_code,
            'trans'        => $t->trans,
            'amount'       => $t->amount,
            'type'         => $t->type,
            'status'       => $t->status,
            'status_label' => TransactionStatus::from((int) $t->status)->label(),
            'proof_image'  => $t->proof_image ? Storage::disk('public')->url($t->proof_image) : null,
            'created_at'   => $t->created_at?->toISOString(),
            'customer'     => $t->customer ? [
                'uuid'     => $t->customer->uuid,
                'fullname' => $t->customer->fullname,
                'email'    => $t->customer->email,
                'phone'    => $t->customer->phone,
                'total'    => $t->customer->total,
                'total_pending' => $t->customer->total_pending,
            ] : null,
        ]);

        return response()->json([
            'error' => false,
            'data'  => [
                'items'        => $items,
                'total'        => $paginated->total(),
                'per_page'     => $paginated->perPage(),
                'current_page' => $paginated->currentPage(),
                'last_page'    => $paginated->lastPage(),
            ],
        ]);
    }

    public function approve(string $uuid): JsonResponse
    {
        $transaction = Transaction::with('customer')
            ->where('uuid', $uuid)
            ->where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->first();

        if (!$transaction) {
            return response()->json([
                'error'   => true,
                'message' => 'Giao dịch không tồn tại hoặc không thể duyệt',
            ], 404);
        }

        DB::beginTransaction();
        try {
            $transaction->update(['status' => TransactionStatus::COMPLETED->value]);

            $customer = $transaction->customer;
            $customer->total += $transaction->amount;
            $customer->credit += (int) floor($transaction->amount / 100);
            $customer->total_pending = max(0, $customer->total_pending - $transaction->amount);
            $customer->save();

            Log::create([
                'agent'       => 'admin',
                'client_ip'   => request()->ip(),
                'description' => 'Admin duyệt nạp tiền thủ công: ' . number_format($transaction->amount) . ' VNĐ (+' . floor($transaction->amount / 100) . ' credit)',
                'customer_id' => $customer->id,
            ]);

            Notification::notifyCustomer($customer, [
                'type' => 'deposit_success',
                'title' => 'Nạp tiền thành công',
                'body' => 'Giao dịch ' . $transaction->public_code . ' đã được duyệt.',
                'link' => '/lich-su-giao-dich/' . $transaction->id,
                'data' => [
                    'transaction_uuid' => $transaction->uuid,
                    'amount' => $transaction->amount,
                    'public_code' => $transaction->public_code,
                ],
            ]);

            DB::commit();
        } catch (\Exception $e) {
            DB::rollBack();
            FacadesLog::error('AdminTransactionController::approve error: ' . $e->getMessage());
            return response()->json([
                'error'   => true,
                'message' => 'Có lỗi xảy ra, vui lòng thử lại',
            ], 500);
        }

        return response()->json([
            'error'   => false,
            'message' => 'Đã duyệt giao dịch thành công',
        ]);
    }

    public function reject(string $uuid): JsonResponse
    {
        $transaction = Transaction::with('customer')
            ->where('uuid', $uuid)
            ->where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->first();

        if (!$transaction) {
            return response()->json([
                'error'   => true,
                'message' => 'Giao dịch không tồn tại hoặc không thể từ chối',
            ], 404);
        }

        DB::beginTransaction();
        try {
            $transaction->update(['status' => TransactionStatus::FAILED->value]);

            $customer = $transaction->customer;
            $customer->total_pending = max(0, $customer->total_pending - $transaction->amount);
            $customer->save();

            Log::create([
                'agent'       => 'admin',
                'client_ip'   => request()->ip(),
                'description' => 'Admin từ chối nạp tiền thủ công: ' . number_format($transaction->amount) . ' VNĐ',
                'customer_id' => $customer->id,
            ]);

            DB::commit();
        } catch (\Exception $e) {
            DB::rollBack();
            FacadesLog::error('AdminTransactionController::reject error: ' . $e->getMessage());
            return response()->json([
                'error'   => true,
                'message' => 'Có lỗi xảy ra, vui lòng thử lại',
            ], 500);
        }

        return response()->json([
            'error'   => false,
            'message' => 'Đã từ chối giao dịch',
        ]);
    }
}