<?php

namespace Tests\Feature;

use App\Jobs\AgentRunJob;
use App\Models\Message;
use App\Services\Agent\AgentContext;
use App\Services\Agent\AgentProviderInterface;
use App\Services\Agent\ProviderEvent;
use App\Services\CancelChecker;
use App\Services\ChatService;
use App\Services\RunDispatcher;
use App\Services\RunLoop;
use App\Services\OutputSink;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\Queue;
use Tests\TestCase;

class AgentRunTest extends TestCase
{
    use RefreshDatabase;

    public function test_dispatch_and_run_creates_agent_reply_and_statuses(): void
    {
        Queue::fake();
        $service = app(ChatService::class);
        $dispatcher = app(RunDispatcher::class);

        $session = $service->createSession('Run Session');
        $prompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'hello agent',
        ]);

        $runId = $dispatcher->dispatchForPrompt($session->session_id, $prompt->message_id);

        Queue::assertPushed(AgentRunJob::class, function ($job) use ($session, $runId) {
            return $job->sessionId === $session->session_id && $job->runId === $runId;
        });

        // simulate worker execution
        (new AgentRunJob($session->session_id, $runId))->handle(
            app(RunLoop::class),
            app(OutputSink::class),
            app(CancelChecker::class)
        );

        $messages = Message::query()
            ->where('session_id', $session->session_id)
            ->orderBy('seq')
            ->get();

        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'run.status' && ($m->payload['status'] ?? null) === 'RUNNING'));
        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'agent.message' && ($m->payload['run_id'] ?? null) === $runId));
        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'run.status' && ($m->payload['status'] ?? null) === 'DONE'));
    }

    public function test_dispatch_is_idempotent_for_same_trigger(): void
    {
        Queue::fake();
        $service = app(ChatService::class);
        $dispatcher = app(RunDispatcher::class);

        $session = $service->createSession('Idempotent Run');
        $prompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'please run once',
        ]);

        $firstRunId = $dispatcher->dispatchForPrompt($session->session_id, $prompt->message_id);
        $secondRunId = $dispatcher->dispatchForPrompt($session->session_id, $prompt->message_id);

        $this->assertSame($firstRunId, $secondRunId);

        Queue::assertPushed(AgentRunJob::class, 1);

        $statusMessages = Message::query()
            ->where('session_id', $session->session_id)
            ->where('type', 'run.status')
            ->whereRaw("payload->>'trigger_message_id' = ?", [$prompt->message_id])
            ->get();

        $this->assertCount(1, $statusMessages);
    }

    public function test_second_prompt_dispatches_new_run_after_first_completes(): void
    {
        Queue::fake();
        $service = app(ChatService::class);
        $dispatcher = app(RunDispatcher::class);

        $session = $service->createSession('Sequential Runs');
        $firstPrompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'first run',
        ]);

        $firstRunId = $dispatcher->dispatchForPrompt($session->session_id, $firstPrompt->message_id);

        (new AgentRunJob($session->session_id, $firstRunId))->handle(
            app(RunLoop::class),
            app(OutputSink::class),
            app(CancelChecker::class)
        );

        $secondPrompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'second run',
        ]);

        $secondRunId = $dispatcher->dispatchForPrompt($session->session_id, $secondPrompt->message_id);

        $this->assertNotSame($firstRunId, $secondRunId);

        Queue::assertPushed(AgentRunJob::class, 2);
        Queue::assertPushed(AgentRunJob::class, function ($job) use ($secondRunId, $session) {
            return $job->runId === $secondRunId && $job->sessionId === $session->session_id;
        });
    }

    public function test_repeated_job_does_not_duplicate_agent_message(): void
    {
        Queue::fake();
        $service = app(ChatService::class);
        $dispatcher = app(RunDispatcher::class);

        $session = $service->createSession('Retry Session');
        $prompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'retry run',
        ]);

        $runId = $dispatcher->dispatchForPrompt($session->session_id, $prompt->message_id);

        (new AgentRunJob($session->session_id, $runId))->handle(
            app(RunLoop::class),
            app(OutputSink::class),
            app(CancelChecker::class)
        );

        (new AgentRunJob($session->session_id, $runId))->handle(
            app(RunLoop::class),
            app(OutputSink::class),
            app(CancelChecker::class)
        );

        $agentMessages = Message::query()
            ->where('session_id', $session->session_id)
            ->where('type', 'agent.message')
            ->whereRaw("payload->>'run_id' = ?", [$runId])
            ->get();

        $doneStatuses = Message::query()
            ->where('session_id', $session->session_id)
            ->where('type', 'run.status')
            ->whereRaw("payload->>'run_id' = ?", [$runId])
            ->whereRaw("payload->>'status' = ?", ['DONE'])
            ->get();

        $this->assertCount(1, $agentMessages);
        $this->assertCount(1, $doneStatuses);
    }

    public function test_cancel_prevents_agent_reply_and_marks_canceled(): void
    {
        Queue::fake();
        $service = app(ChatService::class);
        $dispatcher = app(RunDispatcher::class);
        $loop = app(RunLoop::class);

        $session = $service->createSession('Cancel Session');
        $prompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'please cancel',
        ]);

        $runId = $dispatcher->dispatchForPrompt($session->session_id, $prompt->message_id);

        $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'run.cancel.request',
            'payload' => ['run_id' => $runId],
        ]);

        $loop->run($session->session_id, $runId);

        $messages = Message::query()
            ->where('session_id', $session->session_id)
            ->get();

        $this->assertFalse($messages->contains(fn ($m) => $m->type === 'agent.message' && ($m->payload['run_id'] ?? null) === $runId));
        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'run.status' && ($m->payload['status'] ?? null) === 'CANCELED'));
    }

    public function test_provider_error_event_writes_error_and_failed_status(): void
    {
        Queue::fake();
        $this->app->bind(AgentProviderInterface::class, function () {
            return new class implements AgentProviderInterface {
                public function stream(AgentContext $context, array $options = []): \Generator
                {
                    yield ProviderEvent::error('HTTP_ERROR', 'provider failed', [
                        'retryable' => true,
                        'http_status' => 500,
                    ]);
                }
            };
        });

        $service = app(ChatService::class);
        $dispatcher = app(RunDispatcher::class);

        $session = $service->createSession('Provider Failure');
        $prompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'trigger failure',
        ]);

        $runId = $dispatcher->dispatchForPrompt($session->session_id, $prompt->message_id);

        (new AgentRunJob($session->session_id, $runId))->handle(
            app(RunLoop::class),
            app(OutputSink::class),
            app(CancelChecker::class)
        );

        $messages = Message::query()
            ->where('session_id', $session->session_id)
            ->get();

        $this->assertTrue($messages->contains(function ($m) use ($runId) {
            return $m->type === 'run.status'
                && ($m->payload['status'] ?? null) === 'FAILED'
                && ($m->payload['run_id'] ?? null) === $runId;
        }));

        $this->assertTrue($messages->contains(function ($m) use ($runId) {
            return $m->type === 'error'
                && $m->content === 'HTTP_ERROR'
                && ($m->payload['run_id'] ?? null) === $runId
                && ($m->payload['retryable'] ?? null) === true
                && ($m->payload['http_status'] ?? null) === 500;
        }));
    }

    public function test_tool_call_triggers_child_run_and_continues_to_final_message(): void
    {
        $this->app->bind(AgentProviderInterface::class, function () {
            return new class implements AgentProviderInterface {
                public int $calls = 0;

                public function stream(AgentContext $context, array $options = []): \Generator
                {
                    if ($this->calls === 0) {
                        $this->calls++;
                        yield ProviderEvent::toolDelta([
                            'tool_calls' => [
                                [
                                    'id' => 'call_1',
                                    'name' => 'get_time',
                                    'arguments' => '{"format":"c"}',
                                    'index' => 0,
                                ],
                            ],
                        ]);
                        yield ProviderEvent::done('tool_calls');

                        return;
                    }

                    yield ProviderEvent::messageDelta('tool done');
                    yield ProviderEvent::done('stop');
                }
            };
        });

        $service = app(ChatService::class);
        $dispatcher = app(RunDispatcher::class);

        $session = $service->createSession('Tool Run');
        $prompt = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => Message::ROLE_USER,
            'type' => 'user.prompt',
            'content' => 'use tool',
        ]);

        $runId = $dispatcher->dispatchForPrompt($session->session_id, $prompt->message_id);

        (new AgentRunJob($session->session_id, $runId))->handle(
            app(RunLoop::class),
            app(OutputSink::class),
            app(CancelChecker::class)
        );

        $messages = Message::query()
            ->where('session_id', $session->session_id)
            ->orderBy('seq')
            ->get();

        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'tool.call' && ($m->payload['tool_call_id'] ?? null) === 'call_1'));
        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'tool.result' && ($m->payload['tool_call_id'] ?? null) === 'call_1'));
        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'agent.message' && ($m->payload['run_id'] ?? null) === $runId));
        $this->assertTrue($messages->contains(fn ($m) => $m->type === 'run.status' && ($m->payload['status'] ?? null) === 'DONE'));
    }
}