<?php

namespace Tests\Unit\Services;

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

class DeepSeekProviderTest extends TestCase
{
    use RefreshDatabase;

    private DeepSeekProvider $provider;

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

    public function test_builds_request_correctly(): void
    {
        $messages = [
            ['role' => 'user', 'content' => 'Write a function']
        ];
        
        $options = [
            'model' => 'deepseek-coder',
            'temperature' => 0.5,
            'max_tokens' => 1500
        ];

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

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

        $this->assertEquals('deepseek-coder', $result['model']);
        $this->assertEquals(0.5, $result['temperature']);
        $this->assertEquals(1500, $result['max_tokens']);
        $this->assertEquals($messages, $result['messages']);
        $this->assertFalse($result['stream']);
    }

    public function test_normalizes_response_correctly(): void
    {
        $rawResponse = [
            'id' => 'deepseek-123',
            'model' => 'deepseek-coder',
            'choices' => [
                [
                    'message' => [
                        'role' => 'assistant',
                        'content' => 'def hello_world():\n    print("Hello, World!")'
                    ],
                    'finish_reason' => 'stop'
                ]
            ],
            'usage' => [
                'prompt_tokens' => 8,
                'completion_tokens' => 22,
                'total_tokens' => 30
            ]
        ];

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

        $this->assertEquals('deepseek-123', $normalized['id']);
        $this->assertEquals('deepseek-coder', $normalized['model']);
        $this->assertStringContainsString('def hello_world()', $normalized['content']);
        $this->assertEquals('assistant', $normalized['role']);
        $this->assertEquals('stop', $normalized['finish_reason']);
        $this->assertEquals(8, $normalized['usage']['prompt_tokens']);
        $this->assertEquals(22, $normalized['usage']['completion_tokens']);
        $this->assertEquals(30, $normalized['usage']['total_tokens']);
    }

    public function test_calculates_cost_correctly(): void
    {
        ModelPricing::updateOrCreate(
            [
                'provider' => 'deepseek',
                'model' => 'deepseek-chat',
                'effective_from' => now()->toDateString(),
            ],
            [
                'input_price_per_million' => 0.14,
                'output_price_per_million' => 0.28,
                'is_active' => true,
            ]
        );

        Cache::flush();

        $cost = $this->provider->calculateCost(1000, 500, 'deepseek-chat');

        // Expected: (1000/1M * 0.14) + (500/1M * 0.28) = 0.00014 + 0.00014 = 0.00028
        $this->assertEquals(0.00028, $cost);
    }

    public function test_handles_api_errors(): void
    {
        Http::fake([
            'https://api.deepseek.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('deepseek-chat', $models);
        $this->assertContains('deepseek-coder', $models);
        $this->assertContains('deepseek-reasoner', $models);
    }
}