<?php

namespace App\Services;

use App\Models\SystemSetting;
use App\Models\ExchangeRateHistory;

class ExchangeRateService
{
    /**
     * دریافت نرخ فعلی
     */
    public function getCurrentRate(string $from = 'AED', string $to = 'IRR'): float
    {
        $key = strtolower("{$from}_to_{$to}");
        $setting = SystemSetting::where('key', $key)->first();
        
        if (!$setting) {
            return config('ifnex.financial_defaults.aed_to_irr', 455000);
        }
        
        return (float) $setting->value;
    }

    /**
     * تنظیم نرخ جدید (توسط کاربر)
     */
    public function setRate(
        string $from,
        string $to,
        float $newRate,
        ?int $userId = null,
        ?string $notes = null
    ): ExchangeRateHistory {
        $key = strtolower("{$from}_to_{$to}");
        $oldRate = $this->getCurrentRate($from, $to);

        // Update system_settings
        SystemSetting::updateOrCreate(
            ['key' => $key],
            [
                'value' => (string) $newRate,
                'type' => 'number',
                'description' => "{$from} to {$to} exchange rate",
            ]
        );

        // ثبت در تاریخچه
        return ExchangeRateHistory::recordChange(
            from: $from,
            to: $to,
            oldRate: $oldRate,
            newRate: $newRate,
            source: 'manual',
            userId: $userId,
            notes: $notes
        );
    }

    /**
     * دریافت آخرین تغییرات
     */
    public function getLatestChanges(int $limit = 10)
    {
        return ExchangeRateHistory::with('changedBy')
            ->orderBy('created_at', 'desc')
            ->limit($limit)
            ->get();
    }

    /**
     * دریافت اطلاعات آخرین نرخ برای Widget
     */
    public function getLatestRateInfo(string $from = 'AED', string $to = 'IRR'): array
    {
        $latest = ExchangeRateHistory::latest($from, $to)->with('changedBy')->first();
        $currentRate = $this->getCurrentRate($from, $to);

        return [
            'current_rate' => $currentRate,
            'last_change' => $latest,
            'last_updated' => $latest?->created_at,
            'changed_by' => $latest?->changedBy?->name,
            'source' => $latest?->change_source,
            'change_percent' => $latest?->change_percent,
        ];
    }
}