<?php

namespace App\Services;

use App\Models\Article;
use App\Models\ArticlePublication;
use Carbon\Carbon;

class DashboardStatsService
{
    /**
     * @return array
     */
    public function getStats(string $period = 'today'): array
    {
        $dateRange = $this->getDateRange($period);
        
        // Get articles fetched for the period
        $articlesFetchedQuery = Article::query();
        if ($dateRange) {
            $articlesFetchedQuery->whereBetween('created_at', $dateRange);
        }
        $articlesFetched = $articlesFetchedQuery->count();

        // Get articles published for the period
        $articlesPublishedQuery = ArticlePublication::query()
            ->whereNotNull('published_at');
        if ($dateRange) {
            $articlesPublishedQuery->whereBetween('published_at', $dateRange);
        }
        $articlesPublished = $articlesPublishedQuery->count();

        // Calculate published percentage
        $publishedPercentage = $articlesFetched > 0 ? round(($articlesPublished / $articlesFetched) * 100, 1) : 0.0;

        return [
            'articles_fetched' => $articlesFetched,
            'articles_published' => $articlesPublished,
            'published_percentage' => $publishedPercentage,
        ];
    }

    /**
     * @return array<string, string>
     */
    public function getAvailablePeriods(): array
    {
        return [
            'today' => 'Today',
            'week' => 'This Week',
            'month' => 'This Month',
            'year' => 'This Year',
            'all' => 'All Time',
        ];
    }

    /**
     * @return array{0: Carbon, 1: Carbon}|null
     */
    private function getDateRange(string $period): ?array
    {
        $now = Carbon::now();
        
        return match ($period) {
            'today' => [$now->copy()->startOfDay(), $now->copy()->endOfDay()],
            'week' => [$now->copy()->startOfWeek(), $now->copy()->endOfWeek()],
            'month' => [$now->copy()->startOfMonth(), $now->copy()->endOfMonth()],
            'year' => [$now->copy()->startOfYear(), $now->copy()->endOfYear()],
            'all' => null, // No date filtering for all-time stats
            default => [$now->copy()->startOfDay(), $now->copy()->endOfDay()],
        };
    }

    /**
     * Get additional stats for dashboard
     */
    public function getSystemStats(): array
    {
        return [
            'total_feeds' => \App\Models\Feed::count(),
            'active_feeds' => \App\Models\Feed::where('is_active', true)->count(),
            'total_channels' => \App\Models\PlatformChannel::count(),
            'active_channels' => \App\Models\PlatformChannel::where('is_active', true)->count(),
            'total_routes' => \App\Models\Route::count(),
            'active_routes' => \App\Models\Route::where('is_active', true)->count(),
        ];
    }
}