<?php

namespace App\Http\Controllers;

use App\Models\Commande;
use App\Models\Service;
use App\Models\Contrat;
use App\Models\Domaine;
use App\Models\Budget;
use App\Models\LigneBudget;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Inertia\Inertia;
use Inertia\Response;

class DashboardController extends Controller
{
    public function index(Request $request): Response
    {
        $user = $request->user();
        $isRestricted = !$user->hasRole(['admin', 'directeur', 'raf']);
        $serviceId = $user->service_id;

        $baseCommande = Commande::query();
        if ($isRestricted) {
            $baseCommande->where('service_id', $serviceId);
        }

        $stats = [
            'total'                 => (clone $baseCommande)->count(),
            'en_cours'              => (clone $baseCommande)->enCours()->count(),
            'en_retard'             => (clone $baseCommande)->enRetard()->count(),
            'brouillons'            => (clone $baseCommande)->parStatut('brouillon')->count(),
            'en_attente_validation' => (clone $baseCommande)->parStatut('en_attente_validation')->count(),
            'validees'              => (clone $baseCommande)->parStatut('validee')->count(),
            'commandees'            => (clone $baseCommande)->parStatut('commandee')->count(),
            'partiellement_recues'  => (clone $baseCommande)->parStatut('partiellement_recue')->count(),
            'recues_complete'       => (clone $baseCommande)->parStatut('recue_complete')->count(),
        ];

        $commandesRecentes = (clone $baseCommande)->with(['service', 'fournisseur', 'demandeur'])
            ->latest()
            ->limit(8)
            ->get();

        $commandesEnRetard = (clone $baseCommande)->enRetard()
            ->with(['service', 'fournisseur', 'demandeur'])
            ->orderBy('date_souhaitee')
            ->limit(10)
            ->get();

        $commandesUrgentes = (clone $baseCommande)->urgentes()
            ->enCours()
            ->with(['service', 'fournisseur', 'demandeur'])
            ->latest()
            ->limit(5)
            ->get();

        $statsParStatut = (clone $baseCommande)->select('statut', DB::raw('count(*) as total'))
            ->groupBy('statut')
            ->get()
            ->keyBy('statut');

        $statsParServiceQuery = Service::withCount([
            'commandes',
            'commandes as commandes_en_cours_count' => fn ($q) => $q->enCours(),
        ]);
        
        if ($isRestricted) {
            $statsParServiceQuery->where('id', $serviceId);
        }
        
        $statsParService = $statsParServiceQuery->get();

        $montantParMois = (clone $baseCommande)->select(
            DB::raw('YEAR(date_demande) as annee'),
            DB::raw('MONTH(date_demande) as mois'),
            DB::raw('SUM(montant_ttc) as total_ttc'),
            DB::raw('COUNT(*) as nb_commandes')
        )
            ->whereYear('date_demande', now()->year)
            ->whereNotIn('statut', ['annulee'])
            ->groupBy('annee', 'mois')
            ->orderBy('mois')
            ->get();

        // Stats Contrats
        $contratsQuery = Contrat::query();
        if (!$user->hasRole(['admin', 'raf'])) {
            $contratsQuery->where('service_id', $user->service_id);
        }
        $tousContrats = $contratsQuery->get();
        $statsContrats = [
            'total'     => $tousContrats->count(),
            'proches'   => $tousContrats->filter(fn($c) => $c->est_proche_echeance && !$c->est_en_retard)->count(),
            'en_retard' => $tousContrats->filter(fn($c) => $c->est_en_retard)->count(),
        ];

        // Stats Domaines (Visibles par tous)
        $tousDomaines = Domaine::all();
        $statsDomaines = [
            'total'     => $tousDomaines->count(),
            'proches'   => $tousDomaines->filter(fn($d) => $d->est_proche_echeance && !$d->est_en_retard)->count(),
            'en_retard' => $tousDomaines->filter(fn($d) => $d->est_en_retard)->count(),
        ];

        // Stats Budget
        $anneeCourante = now()->year;
        
        $budgetQuery = LigneBudget::whereHas('budget', function($q) use ($anneeCourante) {
            $q->where('annee', $anneeCourante);
        });
        
        if ($isRestricted) {
            $budgetQuery->whereHas('budget', function($q) use ($serviceId) {
                $q->where('service_id', $serviceId);
            });
        }

        $budgetsStats = [];
        foreach (['agglo', 'mutualise'] as $typeBudget) {
            $budgetQueryType = (clone $budgetQuery)->whereHas('budget', fn($q) => $q->where('type_budget', $typeBudget));
            $baseCommandeType = (clone $baseCommande)->whereHas('ligneBudget.budget', function($q) use ($anneeCourante, $typeBudget) {
                $q->where('annee', $anneeCourante)->where('type_budget', $typeBudget);
            })->whereNotIn('statut', ['annulee']);

            $budgetsStats[$typeBudget] = [
                'total_arbitre' => $budgetQueryType->sum('montant_arbitre'),
                'consomme' => $baseCommandeType->sum('montant_ttc'),
                'fonctionnement' => [
                    'total_arbitre' => (clone $budgetQueryType)->where('type_depense', 'fonctionnement')->sum('montant_arbitre'),
                    'consomme' => (clone $baseCommandeType)->whereHas('ligneBudget', fn($q) => $q->where('type_depense', 'fonctionnement'))->sum('montant_ttc'),
                ],
                'investissement' => [
                    'total_arbitre' => (clone $budgetQueryType)->where('type_depense', 'investissement')->sum('montant_arbitre'),
                    'consomme' => (clone $baseCommandeType)->whereHas('ligneBudget', fn($q) => $q->where('type_depense', 'investissement'))->sum('montant_ttc'),
                ],
            ];
        }

        return Inertia::render('Dashboard/Index', compact(
            'stats',
            'commandesRecentes',
            'commandesEnRetard',
            'commandesUrgentes',
            'statsParStatut',
            'statsParService',
            'montantParMois',
            'statsContrats',
            'statsDomaines',
            'budgetsStats',
        ));
    }
}