<?php

namespace Tests\Unit\Services;

use Tests\TestCase;
use App\Services\LLM\Providers\AnthropicProvider;
use App\Models\ModelPricing;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Cache;
use Illuminate\Foundation\Testing\RefreshDatabase;

class AnthropicProviderTest extends TestCase
{
    use RefreshDatabase;

    private AnthropicProvider $provider;

    protected function setUp(): void
    {
        parent::setUp();
        $this->provider = new AnthropicProvider('test-api-key');
    }

    public function test_builds_request_correctly_with_system_message(): void
    {
        $messages = [
            ['role' => 'system', 'content' => 'You are a helpful assistant'],
            ['role' => 'user', 'content' => 'Hello']
        ];
        
        $options = [
            'model' => 'claude-sonnet-4',
            'temperature' => 0.7,
            'max_tokens' => 2000
        ];

        $reflection = new \ReflectionClass($this->provider);
        $method = $reflection->getMethod('buildRequest');
        $method->setAccessible(true);

        $result = $method->invoke($this->provider, $messages, $options);

        $this->assertEquals('claude-sonnet-4', $result['model']);
        $this->assertEquals(0.7, $result['temperature']);
        $this->assertEquals(2000, $result['max_tokens']);
        $this->assertEquals('You are a helpful assistant', $result['system']);
        $this->assertCount(1, $result['messages']); // System message extracted
        $this->assertEquals('user', $result['messages'][0]['role']);
    }

    public function test_normalizes_response_correctly(): void
    {
        $rawResponse = [
            'id' => 'msg_123',
            'model' => 'claude-sonnet-4',
            'content' => [
                [
                    'type' => 'text',
                    'text' => 'Hello! How can I assist you today?'
                ]
            ],
            'role' => 'assistant',
            'stop_reason' => 'end_turn',
            'usage' => [
                'input_tokens' => 15,
                'output_tokens' => 25
            ]
        ];

        $normalized = $this->provider->normalizeResponse($rawResponse);

        $this->assertEquals('msg_123', $normalized['id']);
        $this->assertEquals('claude-sonnet-4', $normalized['model']);
        $this->assertEquals('Hello! How can I assist you today?', $normalized['content']);
        $this->assertEquals('assistant', $normalized['role']);
        $this->assertEquals('end_turn', $normalized['finish_reason']);
        $this->assertEquals(15, $normalized['usage']['prompt_tokens']);
        $this->assertEquals(25, $normalized['usage']['completion_tokens']);
        $this->assertEquals(40, $normalized['usage']['total_tokens']);
    }

    public function test_calculates_cost_correctly(): void
    {
        // Create pricing in database
        ModelPricing::create([
            'provider' => 'anthropic',
            'model' => 'claude-sonnet-4',
            'input_price_per_million' => 3.00,
            'output_price_per_million' => 15.00,
            'is_active' => true,
            'effective_from' => now()
        ]);

        Cache::flush();

        $cost = $this->provider->calculateCost(1000, 500, 'claude-sonnet-4');

        // Expected: (1000/1M * 3.00) + (500/1M * 15.00) = 0.003 + 0.0075 = 0.0105
        $this->assertEquals(0.0105, $cost);
    }

    public function test_handles_api_errors(): void
    {
        Http::fake([
            'https://api.anthropic.com/*' => Http::response(['error' => 'Invalid API key'], 401)
        ]);

        $this->expectException(\App\Exceptions\ProviderException::class);
        $this->expectExceptionMessage('Invalid API key');

        $this->provider->chatCompletion([
            ['role' => 'user', 'content' => 'test']
        ]);
    }

    public function test_get_supported_models(): void
    {
        $models = $this->provider->getSupportedModels();

        $this->assertIsArray($models);
        $this->assertContains('claude-opus-4', $models);
        $this->assertContains('claude-sonnet-4', $models);
        $this->assertContains('claude-haiku-4', $models);
    }

    public function test_handles_multiple_content_blocks(): void
    {
        $rawResponse = [
            'id' => 'msg_456',
            'model' => 'claude-sonnet-4',
            'content' => [
                ['type' => 'text', 'text' => 'First part. '],
                ['type' => 'text', 'text' => 'Second part.']
            ],
            'role' => 'assistant',
            'stop_reason' => 'end_turn',
            'usage' => ['input_tokens' => 10, 'output_tokens' => 20]
        ];

        $normalized = $this->provider->normalizeResponse($rawResponse);

        $this->assertEquals('First part. Second part.', $normalized['content']);
    }
}