<?php

namespace App\Services;

use App\Models\PriceSyncLog;
use App\Models\PriceSyncLogItem;
use Illuminate\Support\Facades\Schema;

class PriceSyncLogService
{
    public function isAvailable(): bool
    {
        return Schema::hasTable('price_sync_logs') && Schema::hasTable('price_sync_log_items');
    }

    /**
     * @param  array<int, array<string, mixed>>  $items
     */
    public function record(string $source, ?string $sourceUrl, int $liquidGoldPrice, array $items): ?PriceSyncLog
    {
        if (! $this->isAvailable() || $items === []) {
            return null;
        }

        $changedItems = array_values(array_filter(
            $items,
            static fn (array $item) => (bool) ($item['changed'] ?? false)
        ));

        if ($changedItems === []) {
            return null;
        }

        $log = PriceSyncLog::create([
            'source' => $source,
            'source_url' => $sourceUrl,
            'liquid_gold_price' => $liquidGoldPrice,
            'products_updated' => count($changedItems),
            'created_at' => now(),
        ]);

        foreach ($changedItems as $item) {
            PriceSyncLogItem::create([
                'log_id' => $log->id,
                'product_id' => $item['product_id'] ?? null,
                'product_title' => $item['product_title'] ?? null,
                'reading_method' => $item['reading_method'] ?? null,
                'source_name' => $item['source_name'] ?? null,
                'base_price' => (int) ($item['base_price'] ?? 0),
                'base_profit' => (int) ($item['base_profit'] ?? 0),
                'offset_percent' => (float) ($item['offset_percent'] ?? 0),
                'stored_price' => (int) ($item['new_price'] ?? 0),
                'previous_price' => (int) ($item['old_price'] ?? 0),
            ]);
        }

        return $log->load('items');
    }

    /**
     * نمونه دوره‌ای قیمت (مثلاً هر ۳۰ دقیقه) — حتی اگر قیمت نسبت به رکورد قبلی عوض نشده باشد.
     */
    public function recordSnapshot(string $source, ?string $sourceUrl, int $referencePrice): ?PriceSyncLog
    {
        if (! $this->isAvailable() || $referencePrice <= 0) {
            return null;
        }

        return PriceSyncLog::create([
            'source' => $source,
            'source_url' => $sourceUrl,
            'liquid_gold_price' => $referencePrice,
            'products_updated' => 0,
            'created_at' => now(),
        ]);
    }

    /**
     * ثبت در تاریخچه ادمین — حداکثر هر ۳۰ دقیقه (مستقل از تغییر قیمت).
     */
    public function recordSnapshotIfDue(
        string $source,
        ?string $sourceUrl,
        int $referencePrice,
        int $intervalMinutes = 30
    ): ?PriceSyncLog {
        if (! $this->isAvailable() || $referencePrice <= 0) {
            return null;
        }

        $loggedRecently = PriceSyncLog::query()
            ->where('created_at', '>=', now()->subMinutes($intervalMinutes))
            ->exists();

        if ($loggedRecently) {
            return null;
        }

        return $this->recordSnapshot($source, $sourceUrl, $referencePrice);
    }

    /** فقط وقتی قیمت مرجع آبشده نسبت به آخرین رکورد عوض شده باشد */
    public function recordTick(string $source, ?string $sourceUrl, int $liquidGoldPrice, int $productsSynced): ?PriceSyncLog
    {
        if (! $this->isAvailable() || $liquidGoldPrice <= 0) {
            return null;
        }

        $last = PriceSyncLog::query()->orderByDesc('id')->first();
        if ($last && (int) $last->liquid_gold_price === $liquidGoldPrice) {
            return null;
        }

        return PriceSyncLog::create([
            'source' => $source,
            'source_url' => $sourceUrl,
            'liquid_gold_price' => $liquidGoldPrice,
            'products_updated' => $productsSynced,
            'created_at' => now(),
        ]);
    }
}