<?php

namespace Tests\Feature\Project;

use App\Models\Project;
use App\Models\ProjectStatus;
use App\Models\ProjectType;
use App\Models\User;
use Database\Seeders\ProjectStatusSeeder;
use Database\Seeders\ProjectTypeSeeder;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Str;
use Tests\TestCase;

class ProjectTest extends TestCase
{
    use RefreshDatabase;

    protected function setUp(): void
    {
        parent::setUp();
        $this->seed([
            ProjectStatusSeeder::class,
            ProjectTypeSeeder::class,
        ]);
    }

    protected function loginAsManager()
    {
        $user = User::factory()->create([
            'email' => 'manager@example.com',
            'password' => bcrypt('password123'),
            'role' => 'manager',
            'active' => true,
        ]);

        $response = $this->postJson('/api/auth/login', [
            'email' => 'manager@example.com',
            'password' => 'password123',
        ]);

        return $response->json('access_token');
    }

    private function projectPayload(array $overrides = []): array
    {
        $type = ProjectType::first();

        return array_merge([
            'code' => 'TEST-'.strtoupper(Str::random(4)),
            'title' => 'New Project',
            'type_id' => $type->id,
        ], $overrides);
    }

    private function statusId(string $name): int
    {
        return ProjectStatus::where('name', $name)->value('id');
    }

    private function transitionProjectStatus(string $projectId, string $statusName, string $token)
    {
        return $this->withToken($token)->putJson("/api/projects/{$projectId}/status", [
            'status_id' => $this->statusId($statusName),
        ]);
    }

    // 3.1.13 API test: POST /api/projects creates project
    public function test_post_projects_creates_project()
    {
        $token = $this->loginAsManager();
        $payload = $this->projectPayload();

        $response = $this->withToken($token)
            ->postJson('/api/projects', $payload);

        $response->assertStatus(201)
            ->assertJsonFragment([
                'code' => $payload['code'],
                'title' => $payload['title'],
            ]);

        $this->assertDatabaseHas('projects', [
            'code' => $payload['code'],
            'title' => $payload['title'],
        ]);
    }

    // 3.1.14 API test: Project code must be unique
    public function test_project_code_must_be_unique()
    {
        $token = $this->loginAsManager();
        $payload = $this->projectPayload();

        $this->withToken($token)->postJson('/api/projects', $payload)
            ->assertStatus(201);

        $this->withToken($token)->postJson('/api/projects', $payload)
            ->assertStatus(422)
            ->assertJsonStructure([
                'message',
                'errors' => ['code'],
            ]);
    }

    // 3.1.15 API test: Status transition validation
    public function test_status_transition_validation()
    {
        $token = $this->loginAsManager();
        $payload = $this->projectPayload();
        $projectId = $this->withToken($token)
            ->postJson('/api/projects', $payload)
            ->json('id');

        $invalidStatus = $this->statusId('In Progress');

        $this->withToken($token)
            ->putJson("/api/projects/{$projectId}/status", ['status_id' => $invalidStatus])
            ->assertStatus(422)
            ->assertJsonFragment([
                'message' => 'Cannot transition from Pre-sales to In Progress',
            ]);

        $this->transitionProjectStatus($projectId, 'SOW Approval', $token)
            ->assertStatus(200)
            ->assertJsonPath('status.name', 'SOW Approval');
    }

    // 3.1.16 API test: Estimate approved requires estimate value
    public function test_estimate_approved_requires_estimate_value()
    {
        $token = $this->loginAsManager();
        $projectId = $this->withToken($token)
            ->postJson('/api/projects', $this->projectPayload())
            ->json('id');

        $this->transitionProjectStatus($projectId, 'SOW Approval', $token)
            ->assertStatus(200);

        $this->transitionProjectStatus($projectId, 'Estimation', $token)
            ->assertStatus(200);

        $this->transitionProjectStatus($projectId, 'Estimate Approved', $token)
            ->assertStatus(422)
            ->assertJsonFragment([
                'message' => 'Cannot transition to Estimate Approved without an approved estimate',
            ]);
    }

    // 3.1.17 API test: Full workflow state machine
    public function test_full_workflow_state_machine()
    {
        $token = $this->loginAsManager();
        $payload = $this->projectPayload(['approved_estimate' => 120]);
        $projectId = $this->withToken($token)
            ->postJson('/api/projects', $payload)
            ->json('id');

        $workflow = [
            'Pre-sales',
            'SOW Approval',
            'Estimation',
            'Estimate Approved',
            'Resource Allocation',
            'Sprint 0',
            'In Progress',
            'UAT',
            'Handover / Sign-off',
            'Closed',
        ];

        foreach (array_slice($workflow, 1) as $statusName) {
            $this->transitionProjectStatus($projectId, $statusName, $token)
                ->assertStatus(200)
                ->assertJsonPath('status.name', $statusName);
        }
    }

    // 3.1.18 API test: PUT /api/projects/{id}/status transitions
    public function test_put_projects_status_transitions()
    {
        $token = $this->loginAsManager();
        $projectId = $this->withToken($token)
            ->postJson('/api/projects', $this->projectPayload())
            ->json('id');

        $this->transitionProjectStatus($projectId, 'SOW Approval', $token)
            ->assertStatus(200)
            ->assertJsonPath('status.name', 'SOW Approval');

        $this->assertDatabaseHas('projects', [
            'id' => $projectId,
            'status_id' => $this->statusId('SOW Approval'),
        ]);
    }

    // 3.1.19 API test: PUT /api/projects/{id}/estimate sets approved
    public function test_put_projects_estimate_sets_approved()
    {
        $token = $this->loginAsManager();
        $projectId = $this->withToken($token)
            ->postJson('/api/projects', $this->projectPayload())
            ->json('id');

        $this->withToken($token)
            ->putJson("/api/projects/{$projectId}/estimate", ['approved_estimate' => 275])
            ->assertStatus(200)
            ->assertJsonPath('approved_estimate', '275.00');

        $this->assertSame('275.00', (string) Project::find($projectId)->approved_estimate);
    }

    // 3.1.20 API test: PUT /api/projects/{id}/forecast updates effort
    public function test_put_projects_forecast_updates_effort()
    {
        $token = $this->loginAsManager();
        $projectId = $this->withToken($token)
            ->postJson('/api/projects', $this->projectPayload(['approved_estimate' => 100]))
            ->json('id');

        $forecast = ['2025-01' => 33, '2025-02' => 33, '2025-03' => 34];

        $this->withToken($token)
            ->putJson("/api/projects/{$projectId}/forecast", ['forecasted_effort' => $forecast])
            ->assertStatus(200)
            ->assertJsonFragment(['forecasted_effort' => $forecast]);

        $this->assertSame($forecast, Project::find($projectId)->forecasted_effort);
    }

    // 3.1.21 API test: Validate forecasted sum equals approved
    public function test_validate_forecasted_sum_equals_approved()
    {
        $token = $this->loginAsManager();
        $projectId = $this->withToken($token)
            ->postJson('/api/projects', $this->projectPayload(['approved_estimate' => 100]))
            ->json('id');

        $forecast = ['2025-01' => 50, '2025-02' => 50, '2025-03' => 50];

        $this->withToken($token)
            ->putJson("/api/projects/{$projectId}/forecast", ['forecasted_effort' => $forecast])
            ->assertStatus(422)
            ->assertJsonFragment([
                'message' => 'Forecasted effort (150.00 h) exceeds approved estimate (100.00 h) by 50.00 hours (50.00%). Forecasted effort must be between 95.00 and 105.00 hours for a 100.00 hour estimate.',
            ]);

        $this->assertNull(Project::find($projectId)->forecasted_effort);
    }
}