<?php

namespace App\Http\Controllers;

use App\Models\Contrat;
use App\Models\Fournisseur;
use App\Models\Service;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Inertia\Inertia;
use Inertia\Response;
use Illuminate\Support\Facades\DB;

class ContratController extends Controller
{
    public function index(Request $request): Response
    {
        $this->authorize('viewAny', Contrat::class);

        $query = Contrat::with(['fournisseur', 'service']);

        if (!$request->user()->hasRole('admin')) {
            $query->where('service_id', $request->user()->service_id);
        }

        $query->when($request->search, function ($q, $search) {
            $q->where(function ($sub) use ($search) {
                $sub->where('titre', 'like', "%{$search}%")
                    ->orWhereHas('fournisseur', fn($f) => $f->where('nom', 'like', "%{$search}%"));
            });
        })->when($request->service_id, function ($q, $serviceId) use ($request) {
            if ($request->user()->hasRole('admin')) {
                $q->where('service_id', $serviceId);
            }
        })->when($request->fournisseur_id, function ($q, $fournisseurId) {
            $q->where('fournisseur_id', $fournisseurId);
        })->when($request->statut, function ($q, $statut) {
            $q->where('statut', $statut);
        });

        $contrats = $query->orderBy('date_echeance', 'asc')->paginate(20)->withQueryString();

        // Calculate estProcheEcheance for the frontend
        $contrats->getCollection()->transform(function ($contrat) {
            $contrat->append(['est_proche_echeance', 'est_en_retard']);
            return $contrat;
        });

        return Inertia::render('Contrats/Index', [
            'contrats'     => $contrats,
            'services'     => $request->user()->hasRole('admin') ? Service::all() : Service::where('id', $request->user()->service_id)->get(),
            'fournisseurs' => Fournisseur::active()->orderBy('nom')->get(),
            'filters'      => $request->only(['search', 'service_id', 'fournisseur_id', 'statut']),
            'statuts'      => Contrat::STATUTS_LABELS,
        ]);
    }

    public function create(Request $request): Response
    {
        $this->authorize('create', Contrat::class);

        return Inertia::render('Contrats/Create', [
            'services'     => $request->user()->hasRole('admin') ? Service::all() : Service::where('id', $request->user()->service_id)->get(),
            'fournisseurs' => Fournisseur::active()->orderBy('nom')->get(),
            'statuts'      => Contrat::STATUTS_LABELS,
        ]);
    }

    public function store(Request $request): RedirectResponse
    {
        $this->authorize('create', Contrat::class);

        $rules = [
            'titre'          => 'required|string|max:255',
            'description'    => 'nullable|string',
            'fournisseur_id' => 'required|exists:fournisseurs,id',
            'date_debut'     => 'nullable|date',
            'date_echeance'  => 'required|date',
            'statut'         => 'required|in:actif,a_renouveler,expire,resilie',
            'montant'        => 'nullable|numeric|min:0',
            'preavis_jours'  => 'nullable|integer|min:0',
        ];

        // Only admins can select other services, otherwise we force the user's service
        if ($request->user()->hasRole('admin')) {
            $rules['service_id'] = 'required|exists:services,id';
        }

        $validated = $request->validate($rules);

        if (!$request->user()->hasRole('admin')) {
            $validated['service_id'] = $request->user()->service_id;
        }

        $contrat = Contrat::create($validated);

        return redirect()->route('contrats.index')
            ->with('success', 'Contrat créé avec succès.');
    }

    public function show(Contrat $contrat): Response
    {
        $this->authorize('view', $contrat);

        $contrat->load(['fournisseur', 'service', 'piecesJointes.user']);
        $contrat->append(['est_proche_echeance', 'est_en_retard']);

        return Inertia::render('Contrats/Show', [
            'contrat' => $contrat,
        ]);
    }

    public function edit(Contrat $contrat, Request $request): Response
    {
        $this->authorize('update', $contrat);

        return Inertia::render('Contrats/Edit', [
            'contrat'      => $contrat,
            'services'     => $request->user()->hasRole('admin') ? Service::all() : Service::where('id', $request->user()->service_id)->get(),
            'fournisseurs' => Fournisseur::active()->orderBy('nom')->get(),
            'statuts'      => Contrat::STATUTS_LABELS,
        ]);
    }

    public function update(Request $request, Contrat $contrat): RedirectResponse
    {
        $this->authorize('update', $contrat);

        $rules = [
            'titre'          => 'required|string|max:255',
            'description'    => 'nullable|string',
            'fournisseur_id' => 'required|exists:fournisseurs,id',
            'date_debut'     => 'nullable|date',
            'date_echeance'  => 'required|date',
            'statut'         => 'required|in:actif,a_renouveler,expire,resilie',
            'montant'        => 'nullable|numeric|min:0',
            'preavis_jours'  => 'nullable|integer|min:0',
        ];

        if ($request->user()->hasRole('admin')) {
            $rules['service_id'] = 'required|exists:services,id';
        }

        $validated = $request->validate($rules);

        $contrat->update($validated);

        return redirect()->route('contrats.show', $contrat)
            ->with('success', 'Contrat mis à jour.');
    }

    public function destroy(Contrat $contrat): RedirectResponse
    {
        $this->authorize('delete', $contrat);

        $contrat->delete();

        return redirect()->route('contrats.index')
            ->with('success', 'Contrat supprimé.');
    }
}