<?php

namespace App\Http\Controllers\Api\Transaction;

use App\Enums\TransactionStatus;
use App\Http\Controllers\Controller;
use App\Http\Requests\DepositRequest;
use App\Http\Services\Telegram;
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\Storage;
use Illuminate\Support\Str;

class ManualDepositController extends Controller
{
    /**
     * GET /v1/transaction/manual-deposit/pending
     * Kiểm tra xem user có GD manual đang chờ duyệt (đã submit proof) không.
     */
    public function pending(Request $request): JsonResponse
    {
        $user = $request->user();

        $transaction = Transaction::where('customer_id', $user->id)
            ->where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->whereNotNull('proof_image')
            ->latest()
            ->first();

        if (!$transaction) {
            return response()->json(['error' => false, 'data' => ['has_pending' => false]]);
        }

        return response()->json([
            'error' => false,
            'data'  => [
                'has_pending' => true,
                'transaction' => [
                    'public_code' => $transaction->public_code,
                    'amount'      => $transaction->amount,
                    'created_at'  => $transaction->created_at?->toISOString(),
                ],
            ],
        ]);
    }

    /**
     * POST /v1/transaction/manual-deposit/prepare
     * Tạo transaction PENDING và trả về public_code để show trong QR / nội dung CK.
     * Client gọi khi chuyển sang bước chọn ngân hàng.
     */
    public function prepare(DepositRequest $request): JsonResponse
    {
        $user = $request->user();

        // Chặn nếu đã có GD đã submit đang chờ admin duyệt
        $submitted = Transaction::where('customer_id', $user->id)
            ->where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->whereNotNull('proof_image')
            ->exists();

        if ($submitted) {
            return response()->json([
                'error'   => true,
                'message' => 'Bạn đang có yêu cầu nạp tiền chờ duyệt. Vui lòng chờ admin xác nhận trước khi tạo yêu cầu mới.',
            ], 422);
        }

        // Huỷ transaction prepare cũ (chưa có proof) nếu còn tồn tại
        $old = Transaction::where('customer_id', $user->id)
            ->where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->whereNull('proof_image')
            ->latest()
            ->first();

        if ($old) {
            DB::transaction(function () use ($old, $user) {
                $user->total_pending = max(0, $user->total_pending - $old->amount);
                $user->save();
                $old->forceDelete();
            });
        }

        $uuid       = Str::uuid()->toString();
        $publicCode = 'MAN-' . now()->format('Ymd') . '-' . strtoupper(Str::random(6));

        DB::beginTransaction();
        try {
            Transaction::create([
                'uuid'        => $uuid,
                'public_code' => $publicCode,
                'trans'       => 'MAN' . time(),
                'amount'      => $request->amount,
                'customer_id' => $user->id,
                'type'        => 'manual',
                'status'      => TransactionStatus::PENDING->value,
            ]);

            $user->total_pending += $request->amount;
            $user->save();

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

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

    /**
     * DELETE /v1/transaction/manual-deposit/{uuid}/cancel
     * Huỷ transaction đang prepare (chưa có proof, chưa submit).
     * Client gọi khi user quay lại step 1 để đổi số tiền.
     */
    public function cancel(Request $request, string $uuid): JsonResponse
    {
        $user = $request->user();

        $transaction = Transaction::where('uuid', $uuid)
            ->where('customer_id', $user->id)
            ->where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->whereNull('proof_image')
            ->firstOrFail();

        DB::transaction(function () use ($transaction, $user) {
            $user->total_pending = max(0, $user->total_pending - $transaction->amount);
            $user->save();
            $transaction->forceDelete();
        });

        return response()->json(['error' => false, 'message' => 'Đã huỷ yêu cầu']);
    }

    /**
     * POST /v1/transaction/manual-deposit/confirm
     * Attach proof image vào transaction đã prepare rồi đánh dấu đã submit.
     * Client gọi sau khi upload proof ở step 3.
     */
    public function confirm(Request $request): JsonResponse
    {
        $request->validate([
            'uuid'        => 'required|string|uuid',
            'proof_image' => 'required|string|max:500',
        ]);

        $user = $request->user();

        $transaction = Transaction::where('uuid', $request->uuid)
            ->where('customer_id', $user->id)
            ->where('type', 'manual')
            ->where('status', TransactionStatus::PENDING->value)
            ->whereNull('proof_image')
            ->first();

        if (!$transaction) {
            return response()->json([
                'error'   => true,
                'message' => 'Giao dịch không hợp lệ hoặc đã được xử lý',
            ], 422);
        }

        $transaction->update(['proof_image' => $request->proof_image]);

        try {
            (new Telegram())->SendManualDepositPendingApproval($user, $transaction);
        } catch (\Exception) {
            // Không để lỗi Telegram ảnh hưởng response
        }

        Log::create([
            'agent'       => 'api',
            'client_ip'   => $request->ip(),
            'description' => 'Gửi yêu cầu nạp tiền thủ công: ' . number_format($transaction->amount) . ' VNĐ (chờ duyệt)',
            'customer_id' => $user->id,
        ]);

        return response()->json([
            'error'   => false,
            'message' => 'Yêu cầu nạp tiền đã được ghi nhận, vui lòng chờ admin xác nhận',
            'data'    => ['public_code' => $transaction->public_code],
        ]);
    }

    /**
     * POST /v1/transaction/manual-deposit/upload-proof
     * Upload ảnh chứng từ, trả về path để dùng ở bước confirm.
     */
    public function uploadProof(Request $request): JsonResponse
    {
        $request->validate([
            'file' => 'required|image|mimes:jpeg,jpg,png|max:5120',
        ]);

        $path = $request->file('file')->store('deposit-proofs', 'public');

        return response()->json([
            'error' => false,
            'url'   => Storage::disk('public')->url($path),
            'path'  => $path,
        ]);
    }
}