<?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
    {
        $todayRange = $this->getDateRange('today');
        $weekRange = $this->getDateRange('week');
        $monthRange = $this->getDateRange('month');
        
        // Get totals for different periods
        $totalToday = Article::whereBetween('created_at', $todayRange)->count();
        $totalWeek = Article::whereBetween('created_at', $weekRange)->count();
        $totalMonth = Article::whereBetween('created_at', $monthRange)->count();

        // Get approved articles (using approval_status field)
        $approvedToday = Article::whereBetween('created_at', $todayRange)
            ->where('approval_status', 'approved')->count();
        $approvedWeek = Article::whereBetween('created_at', $weekRange)
            ->where('approval_status', 'approved')->count();
        $approvedMonth = Article::whereBetween('created_at', $monthRange)
            ->where('approval_status', 'approved')->count();

        // Calculate approval percentages
        $approvalPercentageToday = $totalToday > 0 ? round(($approvedToday / $totalToday) * 100, 1) : 0.0;
        $approvalPercentageWeek = $totalWeek > 0 ? round(($approvedWeek / $totalWeek) * 100, 1) : 0.0;
        $approvalPercentageMonth = $totalMonth > 0 ? round(($approvedMonth / $totalMonth) * 100, 1) : 0.0;

        return [
            'total_today' => $totalToday,
            'total_week' => $totalWeek,
            'total_month' => $totalMonth,
            'approved_today' => $approvedToday,
            'approved_week' => $approvedWeek,
            'approved_month' => $approvedMonth,
            'approval_percentage_today' => $approvalPercentageToday,
            'approval_percentage_week' => $approvalPercentageWeek,
            'approval_percentage_month' => $approvalPercentageMonth,
        ];
    }

    /**
     * @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_platform_accounts' => \App\Models\PlatformAccount::count(),
            'active_platform_accounts' => \App\Models\PlatformAccount::where('is_active', true)->count(),
            'total_platform_channels' => \App\Models\PlatformChannel::count(),
            'active_platform_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(),
        ];
    }
}