<?php

use App\Models\Asset;
use App\Models\VideoProject;
use App\Support\AssetStorage\AssetStorage;
use App\Support\VideoWorkflow\StepHandlers\VideoEditingHandler;
use App\Support\VideoWorkflow\WorkflowEngine;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Process;
use Illuminate\Support\Facades\Storage;

beforeEach(function () {
    Storage::fake();
    $this->engine = new WorkflowEngine;
    $this->assets = new AssetStorage;
    $this->handler = new VideoEditingHandler($this->assets);

    // Simulates ffmpeg actually writing its output file, and ffprobe
    // reporting a duration, without invoking the real binaries.
    $this->fakeFfmpegSuccess = function () {
        Process::fake(function ($process) {
            $binary = basename($process->command[0] ?? '');

            if ($binary === 'ffprobe') {
                return Process::result(output: '10.0');
            }

            File::put(end($process->command), 'fake-video-bytes');

            return Process::result();
        });
    };

    // Starts a project with video_generation -> video_editing, completes
    // the video_generation step (which auto-activates video_editing via
    // the engine), and returns that now in_progress video_editing step.
    $this->setupPipelineReadyForEditing = function (VideoProject $project, int $sceneCount = 2) {
        $videoGenStep = $this->engine->start($project, [
            ['type' => 'video_generation'],
            ['type' => 'video_editing'],
        ]);

        $assetIds = [];

        for ($i = 1; $i <= $sceneCount; $i++) {
            $asset = $this->assets->store($project, 'image', "scene {$i} bytes", 'png', mimeType: 'image/png', metadata: ['scene_number' => $i]);
            $assetIds[] = $asset->id;
        }

        $this->engine->completeStep($videoGenStep, ['asset_ids' => $assetIds, 'scene_count' => $sceneCount]);

        return $project->steps()->where('type', 'video_editing')->first();
    };
});

test('it assembles scene images with the voiceover audio into a video asset', function () {
    ($this->fakeFfmpegSuccess)();

    $project = VideoProject::factory()->create();
    $step = ($this->setupPipelineReadyForEditing)($project, 2);
    $this->assets->store($project, 'audio', 'fake-mp3-bytes', 'mp3', mimeType: 'audio/mpeg');

    $this->handler->handle($step, $this->engine);

    $fresh = $step->fresh();
    expect($fresh->status)->toBe('completed');

    $asset = Asset::find($fresh->output['asset_id']);
    expect($asset->type)->toBe('video');
    expect($asset->mime_type)->toBe('video/mp4');
    expect($asset->metadata['scene_count'])->toBe(2);
    expect($asset->metadata['duration_seconds'])->toEqual(10.0);
    expect(Storage::get($asset->disk_path))->toBe('fake-video-bytes');

    Process::assertRan(fn ($process) => basename($process->command[0]) === 'ffprobe');
    Process::assertRan(fn ($process) => in_array('concat', $process->command));
    Process::assertRan(fn ($process) => in_array('-shortest', $process->command));
});

test('it assembles scene images with a default duration when there is no audio', function () {
    ($this->fakeFfmpegSuccess)();

    $project = VideoProject::factory()->create();
    $step = ($this->setupPipelineReadyForEditing)($project, 3);

    $this->handler->handle($step, $this->engine);

    $fresh = $step->fresh();
    expect($fresh->status)->toBe('completed');

    $asset = Asset::find($fresh->output['asset_id']);
    expect($asset->metadata['duration_seconds'])->toEqual(12.0); // 3 scenes * 4s default

    Process::assertNotRan(fn ($process) => basename($process->command[0]) === 'ffprobe');
    Process::assertNotRan(fn ($process) => in_array('-shortest', $process->command));
});

test('a seconds_per_scene input overrides the default and the audio-derived duration', function () {
    ($this->fakeFfmpegSuccess)();

    $project = VideoProject::factory()->create();
    $step = ($this->setupPipelineReadyForEditing)($project, 2);
    $step->update(['input' => ['seconds_per_scene' => 7]]);

    $this->handler->handle($step->fresh(), $this->engine);

    $asset = Asset::find($step->fresh()->output['asset_id']);
    expect($asset->metadata['duration_seconds'])->toEqual(14.0); // 2 scenes * 7s
});

test('it fails the step when there are no scene images', function () {
    $project = VideoProject::factory()->create();
    $step = $this->engine->start($project, [['type' => 'video_editing']]);

    $this->handler->handle($step, $this->engine);

    expect($step->fresh())
        ->status->toBe('failed')
        ->error->toContain('No scene images available');
});

test('it fails the step when ffmpeg fails to assemble the images', function () {
    Process::fake(function ($process) {
        $binary = basename($process->command[0] ?? '');

        if ($binary === 'ffprobe') {
            return Process::result(output: '10.0');
        }

        return Process::result(errorOutput: 'concat blew up', exitCode: 1);
    });

    $project = VideoProject::factory()->create();
    $step = ($this->setupPipelineReadyForEditing)($project, 2);

    $this->handler->handle($step, $this->engine);

    expect($step->fresh())
        ->status->toBe('failed')
        ->error->toContain('concat blew up');
});

test('it fails the step when ffmpeg fails to mux the audio', function () {
    Process::fake(function ($process) {
        $binary = basename($process->command[0] ?? '');

        if ($binary === 'ffprobe') {
            return Process::result(output: '10.0');
        }

        if (in_array('concat', $process->command)) {
            File::put(end($process->command), 'silent-video-bytes');

            return Process::result();
        }

        return Process::result(errorOutput: 'mux blew up', exitCode: 1);
    });

    $project = VideoProject::factory()->create();
    $step = ($this->setupPipelineReadyForEditing)($project, 2);
    $this->assets->store($project, 'audio', 'fake-mp3-bytes', 'mp3');

    $this->handler->handle($step, $this->engine);

    expect($step->fresh())
        ->status->toBe('failed')
        ->error->toContain('mux blew up');
});

test('it fails the step when the audio duration cannot be read', function () {
    Process::fake(function ($process) {
        $binary = basename($process->command[0] ?? '');

        return $binary === 'ffprobe'
            ? Process::result(errorOutput: 'no such file', exitCode: 1)
            : Process::result();
    });

    $project = VideoProject::factory()->create();
    $step = ($this->setupPipelineReadyForEditing)($project, 2);
    $this->assets->store($project, 'audio', 'fake-mp3-bytes', 'mp3');

    $this->handler->handle($step, $this->engine);

    expect($step->fresh())
        ->status->toBe('failed')
        ->error->toContain('duration');
});