<?php

namespace Tests\Feature;

use App\Exceptions\BudgetExceededException;
use App\Models\Generation;
use App\Models\RunwareModel;
use App\Services\Runware\GenerationService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Storage;
use Tests\TestCase;

class GenerationServiceTest extends TestCase
{
    use RefreshDatabase;

    protected function service(): GenerationService
    {
        return $this->app->make(GenerationService::class);
    }

    public function test_image_generation_records_actual_cost_and_downloads_file(): void
    {
        Storage::fake('public');
        Http::fake([
            'https://api.runware.ai/v1' => Http::response(['data' => [[
                'taskType' => 'imageInference',
                'taskUUID' => '11111111-1111-1111-1111-111111111111',
                'imageURL' => 'https://cdn.example.com/out.jpg',
                'cost' => 0.01,
            ]]]),
            'https://cdn.example.com/out.jpg' => Http::response('FAKEBYTES'),
        ]);

        RunwareModel::create([
            'modality' => 'image', 'air_id' => 'a:cheap@1', 'label' => 'Cheap',
            'unit' => 'per_image', 'price_usd' => 0.01, 'active' => true, 'is_default' => true,
        ]);

        $generation = $this->service()->createImage('a cat wearing a hat');

        $this->assertSame('completed', $generation->status);
        $this->assertEquals(0.01, $generation->cost_usd);
        $this->assertNotNull($generation->cost_eur);
        $this->assertFalse($generation->cost_is_estimated);
        Storage::disk('public')->assertExists($generation->output_path);
    }

    public function test_failed_api_call_marks_generation_failed_without_cost(): void
    {
        Http::fake([
            'https://api.runware.ai/v1' => Http::response(['errors' => [['message' => 'boom']]], 400),
        ]);

        RunwareModel::create([
            'modality' => 'image', 'air_id' => 'a:cheap@1', 'label' => 'Cheap',
            'unit' => 'per_image', 'price_usd' => 0.01, 'active' => true, 'is_default' => true,
        ]);

        $this->expectException(\RuntimeException::class);

        try {
            $this->service()->createImage('a cat wearing a hat');
        } finally {
            $generation = Generation::first();
            $this->assertSame('failed', $generation->status);
            $this->assertNull($generation->cost_usd);
        }
    }

    public function test_budget_cap_blocks_generation_that_would_exceed_it(): void
    {
        config(['runware.monthly_cap_eur' => 0.001]);

        RunwareModel::create([
            'modality' => 'image', 'air_id' => 'a:pricey@1', 'label' => 'Pricey',
            'unit' => 'per_image', 'price_usd' => 10, 'active' => true, 'is_default' => true,
        ]);

        $this->expectException(BudgetExceededException::class);

        $this->service()->createImage('this should never call the API');

        Http::assertNothingSent();
    }

    public function test_text_generation_falls_back_to_estimated_cost_when_usage_cost_missing(): void
    {
        Http::fake([
            'https://api.runware.ai/v1/chat/completions' => Http::response([
                'choices' => [['message' => ['content' => 'Hello there']]],
                'usage' => ['total_tokens' => 100],
            ]),
        ]);

        RunwareModel::create([
            'modality' => 'text', 'air_id' => 't:cheap@1', 'label' => 'Cheap',
            'unit' => 'per_million_tokens', 'price_usd' => 1, 'active' => true, 'is_default' => true,
        ]);

        $generation = $this->service()->createText('say hello');

        $this->assertSame('completed', $generation->status);
        $this->assertSame('Hello there', $generation->output_text);
        $this->assertTrue($generation->cost_is_estimated);
        $this->assertEqualsWithDelta(0.0001, $generation->cost_usd, 0.00001);
    }
}