<?php

namespace App\Http\Controllers;

use App\ShorakaTransaction;
use App\Services\ShorakaService;
use Carbon\Carbon;
use Illuminate\Database\QueryException;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Throwable;

class ShorakaController extends Controller
{
    public function submit(Request $request, ShorakaService $shoraka)
    {
        $validated = $this->validate($request, [
            'norujukan' => 'required|string|max:255',
            'ownership' => 'required|string|max:255',
            'order_amount' => 'required|numeric|min:0.01|max:9999999999999.99',
            'murabaha_amount' => 'required|numeric|min:0.01|max:9999999999999.99',
            'tenor_other' => 'required|integer|min:1',
        ]);
        if (!$shoraka->configured()) {
            return $this->unconfigured();
        }

        $existing = ShorakaTransaction::where('norujukan', $validated['norujukan'])->first();
        if ($existing) {
            return $this->duplicate($existing);
        }

        $payload = [
            'product_type' => 'FINANCING',
            'commodity_type' => '000-COPPER',
            'ownership' => $validated['ownership'],
            'ownership_doc_no' => $validated['norujukan'],
            'value_date' => Carbon::now()->format('d/m/Y'),
            'order_currency' => 'MYR',
            'order_amount' => number_format((float) $validated['order_amount'], 2, '.', ''),
            'murabaha_amount' => number_format((float) $validated['murabaha_amount'], 2, '.', ''),
            // Appendix codes in v1.5: OTHERS and MONTH.
            'tenor' => 'OTHERS',
            'tenor_other' => $validated['tenor_other'],
            'tenor_other_unit' => 'MONTH',
            'order_type' => 'Buy & Sell',
        ];

        try {
            // The unique norujukan index is the atomic claim for concurrent submissions.
            $transaction = ShorakaTransaction::create([
                'norujukan' => $validated['norujukan'],
                'kodcaw' => $request->attributes->get('shoraka_kodcaw'),
                'status' => 'PENDING',
                'product_type' => $payload['product_type'],
                'commodity_type' => $payload['commodity_type'],
                'ownership_name' => $payload['ownership'],
                'ownership_doc_no' => $payload['ownership_doc_no'],
                'order_amount' => $payload['order_amount'],
                'murabaha_amount' => $payload['murabaha_amount'],
                'request_payload' => $payload,
                'attempt_count' => 1,
            ]);
        } catch (QueryException $exception) {
            $existing = ShorakaTransaction::where('norujukan', $validated['norujukan'])->first();
            if ($existing) {
                return $this->duplicate($existing);
            }
            throw $exception;
        }

        try {
            $response = $shoraka->submitOrder($payload);
            $this->saveOrder($transaction, $response);

            return response()->json([
                'success' => true,
                'message' => 'Order berjaya dihantar ke Shoraka.',
                'data' => $this->orderData($transaction),
            ]);
        } catch (Throwable $exception) {
            // A timeout or invalid response does not prove the remote trade failed.
            // Block resubmission until this reference has been reconciled with Shoraka.
            $transaction->update([
                'status' => $transaction->order_id ? $transaction->status : 'UNKNOWN',
                'error_message' => 'Submission outcome requires reconciliation with Shoraka.',
            ]);

            return $this->upstreamError('submit', $transaction, $exception);
        }
    }

    public function refresh(string $norujukan, ShorakaService $shoraka)
    {
        if (!$shoraka->configured()) {
            return $this->unconfigured();
        }
        $transaction = ShorakaTransaction::where('norujukan', $norujukan)->firstOrFail();
        if (!$transaction->order_id) {
            return $this->missingOrderId();
        }

        try {
            $response = $shoraka->orderStatus($transaction->order_id);
            $this->saveOrder($transaction, $response);

            return response()->json(['success' => true, 'data' => $this->orderData($transaction)]);
        } catch (Throwable $exception) {
            return $this->upstreamError('status', $transaction, $exception);
        }
    }

    public function certificate(string $norujukan, ShorakaService $shoraka)
    {
        if (!$shoraka->configured()) {
            return $this->unconfigured();
        }
        $transaction = ShorakaTransaction::where('norujukan', $norujukan)->firstOrFail();
        if (!$transaction->order_id) {
            return $this->missingOrderId();
        }

        try {
            $pdf = $shoraka->certificate($transaction->order_id);

            return response($pdf, 200, [
                'Content-Type' => 'application/pdf',
                'Content-Disposition' => 'attachment; filename="shoraka-' . $transaction->id . '.pdf"',
                'Cache-Control' => 'private, no-store',
            ]);
        } catch (Throwable $exception) {
            return $this->upstreamError('certificate', $transaction, $exception);
        }
    }

    public function callback(Request $request, ShorakaService $shoraka)
    {
        if (!$shoraka->configured()) {
            return $this->unconfigured();
        }
        $payload = $request->json()->all();
        if (!$shoraka->validCallback($payload)) {
            return response()->json(['success' => false, 'message' => 'Invalid callback signature.'], 401);
        }

        // ownershipDocNo and certificateUrl are NOT signed. Never use them to link
        // a callback to a local record or download a file.
        $transaction = ShorakaTransaction::where('order_id', $payload['orderId'])->first();
        if (!$transaction) {
            return response()->json(['success' => false, 'message' => 'Order not found.'], 404);
        }

        try {
            // There is no signed callback timestamp. Query the current order so a
            // delayed/replayed callback cannot directly restore an old status.
            $response = $shoraka->orderStatus($transaction->order_id);
            unset($payload['signature']);
            $this->saveOrder($transaction, $response, ['callback_payload' => $payload]);

            // Exact acknowledgement required by section 6.
            return response('OK', 200, ['Content-Type' => 'text/plain']);
        } catch (Throwable $exception) {
            return $this->upstreamError('callback', $transaction, $exception);
        }
    }

    protected function saveOrder(ShorakaTransaction $transaction, array $response, array $extra = []): void
    {
        $transaction->update(array_merge([
            'order_id' => (string) $response['orderId'],
            'status' => $response['status'],
            'certificate_url' => $response['certificateUrl'] ?? null,
            'response_payload' => $response,
            'submitted_at' => $transaction->submitted_at ?: Carbon::now(),
            'completed_at' => $response['status'] === 'Completed'
                ? ($transaction->completed_at ?: Carbon::now()) : $transaction->completed_at,
            'error_message' => null,
        ], $extra));
        app(\App\Services\ShorakaGadaiService::class)->sync($transaction);
    }

    protected function orderData(ShorakaTransaction $transaction): array
    {
        return [
            'norujukan' => $transaction->norujukan,
            'kodcaw' => $transaction->kodcaw,
            'order_id' => $transaction->order_id,
            'status' => $transaction->status,
            'certificate_url' => $transaction->certificate_url,
        ];
    }

    protected function duplicate(ShorakaTransaction $transaction)
    {
        return response()->json([
            'success' => false,
            'message' => 'Transaksi telah direkodkan. Semak status dengan Shoraka sebelum penghantaran semula.',
            'data' => $this->orderData($transaction),
        ], 409);
    }

    protected function missingOrderId()
    {
        return response()->json([
            'success' => false,
            'message' => 'Order ID belum tersedia. Semakan dengan Shoraka diperlukan.',
        ], 409);
    }

    protected function unconfigured()
    {
        return response()->json([
            'success' => false,
            'message' => 'API ID dan Secret Key Shoraka belum dikonfigurasi.',
        ], 503);
    }

    protected function upstreamError(string $operation, ShorakaTransaction $transaction, Throwable $exception)
    {
        // Connection exceptions may include request details; log only the class.
        Log::error('Shoraka request failed', [
            'operation' => $operation,
            'transaction_id' => $transaction->id,
            'exception_type' => get_class($exception),
        ]);

        return response()->json([
            'success' => false,
            'message' => 'Permintaan Shoraka gagal. Semak status transaksi sebelum mencuba semula.',
        ], 502);
    }
}