<?php

namespace App\Http\Controllers\Customer;

use App\Http\Controllers\Controller;
use App\Models\GoldCredit;
use App\Models\GoldCreditRequest;
use App\Services\GoldCreditService;
use Illuminate\Http\Request;

class GoldCreditController extends Controller
{
    public function __construct(private GoldCreditService $service)
    {
    }

    private function ensureEnabled()
    {
        if (! app(\App\Services\ConfigService::class)->isGoldCreditEnabled()) {
            abort(403, 'اعتبار طلایی برای این نسخه فعال نیست');
        }
    }


    public function show()
    {
        $this->ensureEnabled();

        $customerId = auth('customer')->id();
        $config = $this->service->getPublicConfig();
        $walletGold = $this->service->getCustomerGoldBalance($customerId);
        $tier = $this->service->resolveTierForBalance($walletGold);
        $minBalance = (float) $config['min_balance_gram'];

        $credit = GoldCredit::with('installments')
            ->where('customer_id', $customerId)
            ->whereIn('status', ['pending', 'active', 'completed'])
            ->orderByDesc('id')
            ->first();

        if ($credit) {
            $this->service->refreshOverdueStatuses($credit);
            $credit->load('installments');
        }

        $pendingRequest = GoldCreditRequest::where('customer_id', $customerId)
            ->where('status', 'pending')
            ->latest()
            ->first();

        $remainingSoot = 0;
        if ($credit) {
            $remainingSoot = $credit->installments
                ->whereIn('status', ['pending', 'overdue', 'partial'])
                ->sum('amount_soot');
        }

        $canRequest = !$credit
            && !$pendingRequest
            && $walletGold >= $minBalance
            && $tier !== null;

        return response()->json([
            'credit' => $credit,
            'pending_request' => $pendingRequest,
            'remaining_soot' => $remainingSoot,
            'gram_price_rial' => $this->service->getGramPriceRial(),
            'wallet_gold' => $walletGold,
            'can_request' => $canRequest,
            'suggested_tier' => $tier,
            'config' => $config,
        ]);
    }

    public function requestLoan(Request $request)
    {
        $this->ensureEnabled();

        $data = $request->validate([
            'note' => 'nullable|string|max:500',
        ]);

        $customerId = auth('customer')->id();
        $config = $this->service->getPublicConfig();
        $walletGold = $this->service->getCustomerGoldBalance($customerId);
        $minBalance = (float) $config['min_balance_gram'];
        $tier = $this->service->resolveTierForBalance($walletGold);

        if ($walletGold < $minBalance || !$tier) {
            return response()->json([
                'message' => 'موجودی طلای شما برای ثبت درخواست کافی نیست',
            ], 422);
        }

        $hasActive = GoldCredit::where('customer_id', $customerId)
            ->whereIn('status', ['pending', 'active'])
            ->exists();
        if ($hasActive) {
            return response()->json(['message' => 'شما اعتبار فعال دارید'], 422);
        }

        $hasPending = GoldCreditRequest::where('customer_id', $customerId)
            ->where('status', 'pending')
            ->exists();
        if ($hasPending) {
            return response()->json(['message' => 'درخواست قبلی شما در انتظار بررسی است'], 422);
        }

        $loanRequest = GoldCreditRequest::create([
            'customer_id' => $customerId,
            'requested_gold' => $tier['credit_gram'],
            'requested_months' => $tier['months'] ?? $config['default_months'],
            'note' => $data['note'] ?? null,
            'status' => 'pending',
        ]);

        $this->service->notifyAdminsLoanRequest($loanRequest);

        return response()->json([
            'request' => $loanRequest,
            'message' => $config['request_success_text'],
            'suggested_tier' => $tier,
        ]);
    }

    public function payInstallments(Request $request)
    {
        $this->ensureEnabled();

        $data = $request->validate([
            'installment_ids' => 'required|array|min:1',
            'installment_ids.*' => 'integer|exists:gold_credit_installments,id',
            'pay_method' => 'required|in:gold,rial,mixed',
            'gold_amount' => 'nullable|numeric|min:0',
            'rial_amount' => 'nullable|integer|min:0',
        ]);

        $this->service->assertPayMethodAllowed($data['pay_method']);

        $customerId = auth('customer')->id();
        $credit = GoldCredit::where('customer_id', $customerId)
            ->whereIn('status', ['active'])
            ->orderByDesc('id')
            ->firstOrFail();

        $result = $this->service->payInstallments(
            $credit,
            $data['installment_ids'],
            $data['pay_method'],
            $data['gold_amount'] ?? null,
            $data['rial_amount'] ?? null,
            null
        );

        return response()->json($result);
    }
}