<?php

namespace Tests\Feature;

use App\Models\Budget;
use App\Models\HistoriqueBudget;
use App\Models\LigneBudget;
use App\Models\Service;
use App\Models\User;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Spatie\Permission\Models\Role;
use Tests\TestCase;

class BudgetMetierTest extends TestCase
{
    use RefreshDatabase;

    private function createRole(string $name): Role
    {
        return Role::firstOrCreate(['name' => $name, 'guard_name' => 'web']);
    }

    private function userWithRole(string $role, ?Service $service = null): User
    {
        $service ??= Service::factory()->create();
        $user = User::factory()->create(['service_id' => $service->id, 'email_verified_at' => now()]);
        $user->assignRole($this->createRole($role));
        return $user;
    }

    private function makeBudget(Service $service, string $statut = 'preparation'): Budget
    {
        return Budget::create([
            'service_id'  => $service->id,
            'annee'       => now()->year,
            'type_budget' => 'agglo',
            'statut'      => $statut,
        ]);
    }

    private function makeLigne(Budget $budget, float $propose = 5000, ?float $arbitre = null): LigneBudget
    {
        return LigneBudget::create([
            'budget_id'       => $budget->id,
            'nom'             => 'Ligne test',
            'type_depense'    => 'investissement',
            'montant_propose' => $propose,
            'montant_arbitre' => $arbitre,
        ]);
    }

    private function makeCommande(array $overrides = []): \App\Models\Commande
    {
        static $counter = 1;
        $service = $overrides['service_id'] ?? Service::factory()->create()->id;
        $user    = $overrides['user_id']    ?? User::factory()->create(['service_id' => $service, 'email_verified_at' => now()])->id;

        return \App\Models\Commande::create(array_merge([
            'service_id'      => $service,
            'user_id'         => $user,
            'numero_commande' => 'CMD-METIER-' . $counter++,
            'objet'           => 'Commande test',
            'statut'          => 'brouillon',
            'montant_ht'      => 1000,
            'montant_ttc'     => 1200,
            'date_demande'    => now()->toDateString(),
        ], $overrides));
    }

    // -------------------------------------------------------------------------
    // Historique des arbitrages
    // -------------------------------------------------------------------------

    public function test_arbitrage_creates_historique_entry(): void
    {
        $service = Service::factory()->create();
        $raf     = $this->userWithRole('raf', $service);
        $budget  = $this->makeBudget($service);
        $ligne   = $this->makeLigne($budget, 1000);

        $this->actingAs($raf)->patch(route('lignes-budget.arbitrer', $ligne), [
            'statut_arbitrage' => 'accepte_dsi',
            'montant_arbitre'  => 800,
            'commentaire'      => 'Réduit suite révision priorités',
        ]);

        $this->assertDatabaseHas('historique_budgets', [
            'ligne_budget_id'         => $ligne->id,
            'user_id'                 => $raf->id,
            'ancien_statut'           => 'brouillon',
            'nouveau_statut'          => 'accepte_dsi',
            'ancien_montant_arbitre'  => null,
            'nouveau_montant_arbitre' => 800,
            'commentaire'             => 'Réduit suite révision priorités',
        ]);
    }

    public function test_multiple_arbitrages_build_full_history(): void
    {
        $service = Service::factory()->create();
        $raf     = $this->userWithRole('raf', $service);
        $budget  = $this->makeBudget($service);
        $ligne   = $this->makeLigne($budget, 1000);

        $this->actingAs($raf)->patch(route('lignes-budget.arbitrer', $ligne), [
            'statut_arbitrage' => 'accepte_dsi',
            'montant_arbitre'  => 800,
        ]);

        $this->actingAs($raf)->patch(route('lignes-budget.arbitrer', $ligne), [
            'statut_arbitrage' => 'valide_definitif',
            'montant_arbitre'  => 750,
        ]);

        $this->assertSame(2, HistoriqueBudget::where('ligne_budget_id', $ligne->id)->count());

        // Le deuxième arbitrage (le plus récent) doit tracer le passage de accepte_dsi → valide_definitif
        $last = HistoriqueBudget::where('ligne_budget_id', $ligne->id)->oldest()->skip(1)->first();
        $this->assertEquals('accepte_dsi', $last->ancien_statut);
        $this->assertEquals('valide_definitif', $last->nouveau_statut);
        $this->assertEquals(800, (float) $last->ancien_montant_arbitre);
        $this->assertEquals(750, (float) $last->nouveau_montant_arbitre);
    }

    public function test_historique_is_included_in_budget_show(): void
    {
        $service = Service::factory()->create();
        $raf     = $this->userWithRole('raf', $service);
        $budget  = $this->makeBudget($service);
        $ligne   = $this->makeLigne($budget, 1000);

        $this->actingAs($raf)->patch(route('lignes-budget.arbitrer', $ligne), [
            'statut_arbitrage' => 'accepte_dsi',
            'montant_arbitre'  => 800,
            'commentaire'      => 'Premier arbitrage',
        ]);

        $response = $this->actingAs($raf)->get(route('budgets.show', $budget));

        $response->assertOk();
        $response->assertInertia(fn ($page) =>
            $page->has('lignes.0.historique', 1)
                 ->where('lignes.0.historique.0.commentaire', 'Premier arbitrage')
                 ->where('lignes.0.historique.0.user', $raf->name)
        );
    }

    public function test_historique_deleted_when_ligne_deleted(): void
    {
        $service = Service::factory()->create();
        $raf     = $this->userWithRole('raf', $service);
        $budget  = $this->makeBudget($service);
        $ligne   = $this->makeLigne($budget, 1000);

        $this->actingAs($raf)->patch(route('lignes-budget.arbitrer', $ligne), [
            'statut_arbitrage' => 'accepte_dsi',
            'montant_arbitre'  => 800,
        ]);

        $ligneId = $ligne->id;
        $this->actingAs($this->userWithRole('admin'))->delete(route('lignes-budget.destroy', $ligne));

        $this->assertDatabaseMissing('historique_budgets', ['ligne_budget_id' => $ligneId]);
    }

    // -------------------------------------------------------------------------
    // Blocage des commandes si budget insuffisant
    // -------------------------------------------------------------------------

    public function test_commande_creation_blocked_when_budget_exceeded(): void
    {
        $service  = Service::factory()->create();
        $acheteur = $this->userWithRole('acheteur', $service);
        $budget   = $this->makeBudget($service);
        $ligne    = $this->makeLigne($budget, propose: 5000, arbitre: 1000);

        // Commande existante qui consomme 800 € TTC
        $this->makeCommande([
            'ligne_budget_id' => $ligne->id,
            'service_id'      => $service->id,
            'user_id'         => $acheteur->id,
            'montant_ttc'     => 800,
            'statut'          => 'validee',
        ]);

        // Tentative de créer une commande avec une ligne à 500 € HT + 20% TVA = 600 € TTC
        // Reste dispo : 1000 - 800 = 200 € → 600 > 200 → bloqué
        $response = $this->actingAs($acheteur)->post(route('commandes.store'), [
            'service_id'      => $service->id,
            'objet'           => 'Dépassement test',
            'priorite'        => 'normale',
            'date_demande'    => now()->toDateString(),
            'ligne_budget_id' => $ligne->id,
            'lignes'          => [
                ['designation' => 'Article test', 'quantite' => 1, 'prix_unitaire_ht' => 500, 'taux_tva' => 20],
            ],
        ]);

        $response->assertSessionHasErrors('ligne_budget_id');
    }

    public function test_commande_creation_allowed_when_budget_sufficient(): void
    {
        $service  = Service::factory()->create();
        $acheteur = $this->userWithRole('acheteur', $service);
        $budget   = $this->makeBudget($service);
        $ligne    = $this->makeLigne($budget, propose: 5000, arbitre: 2000);

        // Commande existante de 800 € TTC, reste 1200 €
        $this->makeCommande([
            'ligne_budget_id' => $ligne->id,
            'service_id'      => $service->id,
            'user_id'         => $acheteur->id,
            'montant_ttc'     => 800,
            'statut'          => 'validee',
        ]);

        // Nouvelle ligne à 100 € HT + 20% = 120 € TTC → OK (800+120=920 < 2000)
        $response = $this->actingAs($acheteur)->post(route('commandes.store'), [
            'service_id'      => $service->id,
            'objet'           => 'Commande dans le budget',
            'priorite'        => 'normale',
            'date_demande'    => now()->toDateString(),
            'ligne_budget_id' => $ligne->id,
            'lignes'          => [
                ['designation' => 'Article test', 'quantite' => 1, 'prix_unitaire_ht' => 100, 'taux_tva' => 20],
            ],
        ]);

        $response->assertSessionDoesntHaveErrors('ligne_budget_id');
    }

    public function test_commande_creation_not_blocked_when_ligne_not_yet_arbitree(): void
    {
        $service  = Service::factory()->create();
        $acheteur = $this->userWithRole('acheteur', $service);
        $budget   = $this->makeBudget($service);
        // Ligne sans montant_arbitre
        $ligne    = $this->makeLigne($budget, propose: 1000, arbitre: null);

        // Ligne à 9000 € HT → normalement dépasserait, mais pas arbitrée = pas de blocage
        $response = $this->actingAs($acheteur)->post(route('commandes.store'), [
            'service_id'      => $service->id,
            'objet'           => 'Commande avant arbitrage',
            'priorite'        => 'normale',
            'date_demande'    => now()->toDateString(),
            'ligne_budget_id' => $ligne->id,
            'lignes'          => [
                ['designation' => 'Article test', 'quantite' => 1, 'prix_unitaire_ht' => 9000, 'taux_tva' => 20],
            ],
        ]);

        $response->assertSessionDoesntHaveErrors('ligne_budget_id');
    }
}