<?php

namespace App\Filament\Widgets;

use App\Models\CustomerCredit;
use App\Models\User;
use Filament\Widgets\Widget;
use Illuminate\Support\Facades\DB;

/**
 * ویجت داشبورد — هشدار بدهی‌های ارزی تسویه‌نشده.
 *
 * نمایش:
 *   - مجموع بدهی به تفکیک ارز (EUR/USD/AED/CNY/...)
 *   - لیست ۵ بدهکار برتر (مشتریانی که بیشترین بدهی تسویه‌نشده دارند)
 *   - لینک به صفحه اعتبارها فیلتر‌شده با status=open
 */
class UnsettledCreditsWidget extends Widget
{
    protected static ?int $sort = 2;

    protected static bool $isLazy = false;

    protected int|string|array $columnSpan = 'full';

    protected static string $view = 'filament.widgets.unsettled-credits';

    protected function getViewData(): array
    {
        // ─── خلاصه به تفکیک ارز ───
        $currencySummary = CustomerCredit::whereIn('status', ['open', 'partially_settled'])
            ->select('currency_code')
            ->selectRaw('SUM(amount) as total_amount')
            ->selectRaw('SUM(settled_amount) as total_settled')
            ->selectRaw('SUM(amount - settled_amount) as total_balance')
            ->selectRaw('COUNT(*) as credit_count')
            ->groupBy('currency_code')
            ->orderBy('total_balance', 'desc')
            ->get()
            ->map(fn ($r) => [
                'currency_code'  => $r->currency_code,
                'total_amount'   => (float) $r->total_amount,
                'total_settled'  => (float) $r->total_settled,
                'total_balance'  => (float) $r->total_balance,
                'credit_count'   => (int) $r->credit_count,
            ]);

        // ─── تعداد کل اعتبارهای باز ───
        $totalOpenCredits = CustomerCredit::whereIn('status', ['open', 'partially_settled'])->count();

        // ─── تعداد مشتریان بدهکار ───
        $totalDebtors = CustomerCredit::whereIn('status', ['open', 'partially_settled'])
            ->distinct('user_id')
            ->count('user_id');

        // ─── ۵ بدهکار برتر (بر اساس مانده کل به ارز) ───
        $topDebtors = CustomerCredit::whereIn('customer_credits.status', ['open', 'partially_settled'])
            ->join('users', 'customer_credits.user_id', '=', 'users.id')
            ->select(
                'users.id as user_id',
                'users.name as user_name',
                'users.phone as user_phone',
                DB::raw('COUNT(customer_credits.id) as credit_count'),
                DB::raw('GROUP_CONCAT(DISTINCT customer_credits.currency_code) as currencies'),
                DB::raw('SUM(customer_credits.amount - customer_credits.settled_amount) as total_balance_sum'),
                DB::raw('MAX(customer_credits.granted_at) as latest_grant')
            )
            ->groupBy('users.id', 'users.name', 'users.phone')
            ->orderBy('total_balance_sum', 'desc')
            ->limit(5)
            ->get();

        return [
            'currencySummary'  => $currencySummary,
            'totalOpenCredits' => $totalOpenCredits,
            'totalDebtors'     => $totalDebtors,
            'topDebtors'       => $topDebtors,
            'hasDebts'         => $currencySummary->isNotEmpty(),
        ];
    }
}