<?php

namespace App\Http\Controllers\Admin;

use App\Enums\SourceStatus;
use App\Http\Controllers\Controller;
use App\Models\Releve;
use App\Models\Source;
use App\Models\User;
use App\Services\UpdateService;
use Illuminate\View\View;

class DashboardController extends Controller
{
    public function index(UpdateService $updates): View
    {
        $installedVersion = $updates->getInstalledVersion();
        $latestRelease    = $updates->fetchLatestRelease(); // depuis le cache Redis
        $updateAvailable  = $latestRelease
            && version_compare($latestRelease['version'], $installedVersion, '>');

        // Compteurs sources par statut
        $sourcesByStatus = Source::selectRaw('status, count(*) as total')
            ->groupBy('status')
            ->pluck('total', 'status')
            ->mapWithKeys(fn ($total, $status) => [
                SourceStatus::from($status)->value => (int) $total,
            ]);

        $totalSources = $sourcesByStatus->sum();
        $totalReleves = Releve::count();

        // Utilisateurs par rôle
        $usersByRole = User::selectRaw('role, count(*) as total')
            ->groupBy('role')
            ->pluck('total', 'role');

        $totalUsers = $usersByRole->sum();

        // Sources en attente de validation
        $sourcesAValider = Source::with(['sourceType', 'depot'])
            ->where('status', SourceStatus::AValider)
            ->orderByDesc('updated_at')
            ->take(10)
            ->get();

        // Relevés récents (10 derniers)
        $relevesRecents = Releve::with(['source.sourceType', 'createur'])
            ->orderByDesc('created_at')
            ->take(10)
            ->get();

        // Activité mensuelle des 6 derniers mois (compatible MySQL et PostgreSQL)
        $driver = config('database.default');
        if ($driver === 'pgsql') {
            $activiteMensuelle = Releve::selectRaw("to_char(date_trunc('month', created_at), 'Mon YYYY') as mois, count(*) as total")
                ->where('created_at', '>=', now()->subMonths(5)->startOfMonth())
                ->groupByRaw("date_trunc('month', created_at)")
                ->orderByRaw("date_trunc('month', created_at)")
                ->get();
        } else {
            $activiteMensuelle = Releve::selectRaw("DATE_FORMAT(MIN(created_at), '%b %Y') as mois, count(*) as total")
                ->where('created_at', '>=', now()->subMonths(5)->startOfMonth())
                ->groupByRaw("YEAR(created_at), MONTH(created_at)")
                ->orderByRaw("YEAR(created_at), MONTH(created_at)")
                ->get();
        }

        return view('admin.dashboard', compact(
            'sourcesByStatus', 'totalSources', 'totalReleves',
            'usersByRole', 'totalUsers',
            'sourcesAValider', 'relevesRecents', 'activiteMensuelle',
            'installedVersion', 'latestRelease', 'updateAvailable'
        ));
    }
}