<?php

use App\Models\VideoProject;
use App\Models\WorkflowTemplate;
use App\Support\VideoWorkflow\WorkflowEngine;
use App\Support\VideoWorkflow\WorkflowTransitionException;

beforeEach(function () {
    $this->engine = new WorkflowEngine;
});

test('starting a workflow creates ordered steps and activates the first one', function () {
    $project = VideoProject::factory()->create();

    $first = $this->engine->start($project, [
        ['type' => 'script_generation', 'requires_approval' => true],
        ['type' => 'tts_voiceover'],
        ['type' => 'video_generation'],
    ]);

    expect($project->fresh()->status)->toBe('in_progress');
    expect($project->steps)->toHaveCount(3);

    expect($first)
        ->type->toBe('script_generation')
        ->order->toBe(0)
        ->status->toBe('in_progress')
        ->requires_approval->toBeTrue();
    expect($first->started_at)->not->toBeNull();

    expect($project->steps()->where('order', 1)->first())
        ->type->toBe('tts_voiceover')
        ->status->toBe('pending');
});

test('it refuses to start a project that already has steps', function () {
    $project = VideoProject::factory()->create();
    $this->engine->start($project, [['type' => 'script_generation']]);

    $this->engine->start($project, [['type' => 'tts_voiceover']]);
})->throws(WorkflowTransitionException::class);

test('it refuses to start a workflow with no steps', function () {
    $project = VideoProject::factory()->create();

    $this->engine->start($project, []);
})->throws(WorkflowTransitionException::class);

test('startFromTemplate uses the template steps and links the project to it', function () {
    $template = WorkflowTemplate::factory()->create([
        'steps' => [
            ['type' => 'script_generation'],
            ['type' => 'youtube_publish'],
        ],
    ]);
    $project = VideoProject::factory()->create();

    $this->engine->startFromTemplate($project, $template);

    expect($project->fresh())
        ->workflow_template_id->toBe($template->id)
        ->status->toBe('in_progress');
    expect($project->steps)->toHaveCount(2);
});

test('currentStep returns the earliest non-terminal step', function () {
    $project = VideoProject::factory()->create();
    $this->engine->start($project, [
        ['type' => 'script_generation'],
        ['type' => 'tts_voiceover'],
    ]);

    expect($this->engine->currentStep($project)->type)->toBe('script_generation');
});

test('currentStep is null once every step is completed', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'script_generation']]);

    $this->engine->completeStep($step);

    expect($this->engine->currentStep($project->fresh()))->toBeNull();
});

test('completing a step without approval advances straight to the next step', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [
        ['type' => 'script_generation'],
        ['type' => 'tts_voiceover'],
    ]);

    $completed = $this->engine->completeStep($step, ['script' => 'Hello world']);

    expect($completed)
        ->status->toBe('completed')
        ->output->toBe(['script' => 'Hello world']);
    expect($completed->completed_at)->not->toBeNull();

    $next = $project->steps()->where('order', 1)->first();
    expect($next->status)->toBe('in_progress');
});

test('completing a step that requires approval stops at awaiting_approval', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [
        ['type' => 'script_generation', 'requires_approval' => true],
        ['type' => 'tts_voiceover'],
    ]);

    $completed = $this->engine->completeStep($step, ['script' => 'Draft']);

    expect($completed->status)->toBe('awaiting_approval');

    $next = $project->steps()->where('order', 1)->first();
    expect($next->status)->toBe('pending');
});

test('completing a step that is not in_progress throws', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'script_generation']]);
    $this->engine->completeStep($step);

    $this->engine->completeStep($step->fresh());
})->throws(WorkflowTransitionException::class);

test('approving a step advances the pipeline', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [
        ['type' => 'script_generation', 'requires_approval' => true],
        ['type' => 'tts_voiceover'],
    ]);
    $this->engine->completeStep($step, ['script' => 'Draft']);

    $approved = $this->engine->approveStep($step->fresh());

    expect($approved->status)->toBe('completed');
    expect($project->steps()->where('order', 1)->first()->status)->toBe('in_progress');
});

test('rejecting a step blocks the pipeline without advancing', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [
        ['type' => 'script_generation', 'requires_approval' => true],
        ['type' => 'tts_voiceover'],
    ]);
    $this->engine->completeStep($step, ['script' => 'Bad draft']);

    $rejected = $this->engine->rejectStep($step->fresh(), 'Tone is wrong');

    expect($rejected)
        ->status->toBe('rejected')
        ->error->toBe('Tone is wrong');
    expect($project->steps()->where('order', 1)->first()->status)->toBe('pending');
});

test('approving a step that is not awaiting_approval throws', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'script_generation']]);

    $this->engine->approveStep($step);
})->throws(WorkflowTransitionException::class);

test('a failed step blocks the pipeline and records the error', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [
        ['type' => 'script_generation'],
        ['type' => 'tts_voiceover'],
    ]);

    $failed = $this->engine->failStep($step, 'OpenAI API timed out');

    expect($failed)
        ->status->toBe('failed')
        ->error->toBe('OpenAI API timed out');
    expect($project->steps()->where('order', 1)->first()->status)->toBe('pending');
});

test('a failed step can be retried', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'script_generation']]);
    $this->engine->failStep($step, 'timed out');

    $retried = $this->engine->retryStep($step->fresh());

    expect($retried)
        ->status->toBe('in_progress')
        ->error->toBeNull();
});

test('a rejected step can be retried', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'script_generation', 'requires_approval' => true]]);
    $this->engine->completeStep($step, ['script' => 'v1']);
    $this->engine->rejectStep($step->fresh(), 'no good');

    $retried = $this->engine->retryStep($step->fresh());

    expect($retried)
        ->status->toBe('in_progress')
        ->output->toBeNull();
});

test('retrying a step that is not failed or rejected throws', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'script_generation']]);

    $this->engine->retryStep($step);
})->throws(WorkflowTransitionException::class);

test('skipping a pending or in_progress step advances the pipeline', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [
        ['type' => 'script_generation'],
        ['type' => 'tts_voiceover'],
    ]);

    $skipped = $this->engine->skipStep($step);

    expect($skipped->status)->toBe('skipped');
    expect($project->steps()->where('order', 1)->first()->status)->toBe('in_progress');
});

test('completing the last step marks the project completed', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'script_generation']]);

    $this->engine->completeStep($step);

    expect($project->fresh()->status)->toBe('completed');
});

test('a full multi-step pipeline runs end to end', function () {
    $project = VideoProject::factory()->create();
    $script = $this->engine->start($project, [
        ['type' => 'script_generation', 'requires_approval' => true],
        ['type' => 'tts_voiceover'],
        ['type' => 'video_generation', 'requires_approval' => true],
    ]);

    $this->engine->completeStep($script, ['script' => 'Hello']);
    $script = $script->fresh();
    expect($script->status)->toBe('awaiting_approval');
    $this->engine->approveStep($script);

    $tts = $this->engine->currentStep($project->fresh());
    expect($tts->type)->toBe('tts_voiceover');
    $this->engine->completeStep($tts, ['audio_path' => '/tmp/a.mp3']);

    $video = $this->engine->currentStep($project->fresh());
    expect($video->type)->toBe('video_generation');
    $this->engine->completeStep($video, ['video_path' => '/tmp/v.mp4']);
    $this->engine->approveStep($video->fresh());

    expect($project->fresh())
        ->status->toBe('completed');
    expect($this->engine->currentStep($project->fresh()))->toBeNull();
});