<?php

namespace Tests\Unit;

use App\Models\Message;
use App\Services\Agent\AgentContext;
use App\Services\Agent\OpenAi\ChatCompletionsRequestBuilder;
use App\Services\Agent\OpenAi\OpenAiEventNormalizer;
use App\Services\Agent\OpenAi\OpenAiStreamParser;
use App\Services\Agent\ProviderEventType;
use App\Services\Tool\ToolRegistry;
use GuzzleHttp\Psr7\Utils;
use Tests\TestCase;

class OpenAiAdapterTest extends TestCase
{
    public function test_request_builder_maps_context_to_openai_payload(): void
    {
        config()->set('agent.openai.model', 'test-model');
        config()->set('agent.openai.temperature', 0.2);
        config()->set('agent.openai.top_p', 0.9);
        config()->set('agent.openai.include_usage', true);
        config()->set('agent.tools.tool_choice', 'auto');

        $context = new AgentContext('run-1', 'session-1', 'system prompt', [
            [
                'message_id' => 'm1',
                'role' => Message::ROLE_USER,
                'type' => 'user.prompt',
                'content' => 'hello',
                'payload' => [],
                'seq' => 1,
            ],
            [
                'message_id' => 'm2',
                'role' => Message::ROLE_AGENT,
                'type' => 'agent.message',
                'content' => 'hi',
                'payload' => [],
                'seq' => 2,
            ],
        ]);

        $payload = (new ChatCompletionsRequestBuilder(new ToolRegistry()))->build($context);

        $this->assertSame('test-model', $payload['model']);
        $this->assertTrue($payload['stream']);
        $this->assertSame(0.2, $payload['temperature']);
        $this->assertSame(0.9, $payload['top_p']);
        $this->assertSame(['include_usage' => true], $payload['stream_options']);
        $this->assertNotEmpty($payload['tools']);
        $this->assertSame('auto', $payload['tool_choice']);
        $this->assertSame([
            ['role' => 'system', 'content' => 'system prompt'],
            ['role' => 'user', 'content' => 'hello'],
            ['role' => 'assistant', 'content' => 'hi'],
        ], $payload['messages']);
    }

    public function test_request_builder_maps_tool_messages(): void
    {
        $context = new AgentContext('run-1', 'session-1', 'system prompt', [
            [
                'message_id' => 'm1',
                'role' => Message::ROLE_USER,
                'type' => 'user.prompt',
                'content' => 'call tool',
                'payload' => [],
                'seq' => 1,
            ],
            [
                'message_id' => 'm2',
                'role' => Message::ROLE_AGENT,
                'type' => 'tool.call',
                'content' => null,
                'payload' => [
                    'tool_call_id' => 'call_1',
                    'name' => 'get_time',
                    'arguments' => ['format' => 'c'],
                ],
                'seq' => 2,
            ],
            [
                'message_id' => 'm3',
                'role' => Message::ROLE_TOOL,
                'type' => 'tool.result',
                'content' => '2024-01-01',
                'payload' => [
                    'tool_call_id' => 'call_1',
                    'name' => 'get_time',
                    'output' => '2024-01-01',
                ],
                'seq' => 3,
            ],
        ]);

        $payload = (new ChatCompletionsRequestBuilder(new ToolRegistry()))->build($context);

        $assistantMessage = collect($payload['messages'])->first(fn ($message) => isset($message['tool_calls']));
        $toolResultMessage = collect($payload['messages'])->first(fn ($message) => ($message['role'] ?? '') === 'tool');

        $this->assertNotNull($assistantMessage);
        $this->assertSame('assistant', $assistantMessage['role']);
        $this->assertSame('get_time', $assistantMessage['tool_calls'][0]['function']['name']);
        $this->assertNotNull($toolResultMessage);
        $this->assertSame('call_1', $toolResultMessage['tool_call_id']);
    }

    public function test_disable_tools_still_includes_definitions_when_history_has_tools(): void
    {
        $context = new AgentContext('run-1', 'session-1', 'system prompt', [
            [
                'message_id' => 'm1',
                'role' => Message::ROLE_USER,
                'type' => 'user.prompt',
                'content' => 'call tool',
                'payload' => [],
                'seq' => 1,
            ],
            [
                'message_id' => 'm2',
                'role' => Message::ROLE_AGENT,
                'type' => 'tool.call',
                'content' => null,
                'payload' => [
                    'tool_call_id' => 'call_1',
                    'name' => 'get_time',
                    'arguments' => ['format' => 'c'],
                ],
                'seq' => 2,
            ],
            [
                'message_id' => 'm3',
                'role' => Message::ROLE_TOOL,
                'type' => 'tool.result',
                'content' => '2024-01-01',
                'payload' => [
                    'tool_call_id' => 'call_1',
                    'name' => 'get_time',
                    'output' => '2024-01-01',
                ],
                'seq' => 3,
            ],
        ]);

        $payload = (new ChatCompletionsRequestBuilder(new ToolRegistry()))->build($context, [
            'disable_tools' => true,
        ]);

        $this->assertSame('none', $payload['tool_choice']);
        $this->assertNotEmpty($payload['tools']);
    }

    public function test_event_normalizer_maps_delta_and_done(): void
    {
        $normalizer = new OpenAiEventNormalizer();

        $delta = json_encode([
            'choices' => [
                [
                    'delta' => ['content' => 'Hi'],
                    'finish_reason' => null,
                ],
            ],
        ]);

        $events = $normalizer->normalize($delta);
        $this->assertCount(1, $events);
        $this->assertSame(ProviderEventType::MessageDelta, $events[0]->type);
        $this->assertSame('Hi', $events[0]->payload['text']);

        $done = json_encode([
            'choices' => [
                [
                    'delta' => [],
                    'finish_reason' => 'stop',
                ],
            ],
        ]);

        $events = $normalizer->normalize($done);
        $this->assertCount(1, $events);
        $this->assertSame(ProviderEventType::Done, $events[0]->type);
        $this->assertSame('stop', $events[0]->payload['reason']);
    }

    public function test_event_normalizer_handles_invalid_json(): void
    {
        $normalizer = new OpenAiEventNormalizer();
        $events = $normalizer->normalize('{invalid');

        $this->assertCount(1, $events);
        $this->assertSame(ProviderEventType::Error, $events[0]->type);
        $this->assertSame('INVALID_JSON', $events[0]->payload['code']);
    }

    public function test_event_normalizer_handles_done_marker(): void
    {
        $normalizer = new OpenAiEventNormalizer();
        $events = $normalizer->normalize('[DONE]');

        $this->assertCount(1, $events);
        $this->assertSame(ProviderEventType::Done, $events[0]->type);
    }

    public function test_event_normalizer_handles_tool_delta(): void
    {
        $normalizer = new OpenAiEventNormalizer();

        $toolDelta = json_encode([
            'choices' => [
                [
                    'delta' => [
                        'tool_calls' => [
                            [
                                'id' => 'call_1',
                                'index' => 0,
                                'function' => [
                                    'name' => 'get_time',
                                    'arguments' => '{"format":"Y-m-d"}',
                                ],
                            ],
                        ],
                    ],
                    'finish_reason' => null,
                ],
            ],
        ]);

        $events = $normalizer->normalize($toolDelta);
        $this->assertCount(1, $events);
        $this->assertSame(ProviderEventType::ToolDelta, $events[0]->type);
        $this->assertSame('call_1', $events[0]->payload['tool_calls'][0]['id']);
        $this->assertSame('get_time', $events[0]->payload['tool_calls'][0]['name']);
    }

    public function test_stream_parser_splits_sse_events(): void
    {
        $stream = Utils::streamFor("data: {\"id\":1}\n\ndata: [DONE]\n\n");
        $parser = new OpenAiStreamParser(5);
        $chunks = iterator_to_array($parser->parse($stream));

        $this->assertSame(['{"id":1}', '[DONE]'], $chunks);
    }
}