<?php

namespace Danjones\FFMpeg;

class Map
{
    use Traits\HasMetadata;

    protected MappableMedia $media;
    protected string $path;
    /** @var Stream[] */
    protected array $streams = [];

    public function __construct(MappableMedia $media)
    {
        $this->media = $media;
    }

    public function saveMap(): MappableMedia
    {
        $this->media->saveMap($this);

        return $this->media;
    }

    public function saveAs(string $path): static
    {
        $this->path = $path;

        return $this;
    }

    public function stream(callable $callback = null): Stream|static
    {
        $stream = new Stream($this);
        if (!$callback) {
            return $stream;
        }

        $callback($stream);
        $this->saveStream($stream);

        return $this;
    }

    public function saveStream(Stream $stream): static
    {
        $this->streams[] = $stream;

        return $this;
    }

    public function buildCommand(): array
    {
        $commands = [];
        foreach ($this->streams as $idx => $stream) {
            array_push($commands, ...$stream->buildCommand($idx));
        }
        foreach ($this->metadata as $k => $v) {
            array_push($commands, '-metadata', "{$k}={$v}");
        }
        $commands[] = $this->path;

        return $commands;
    }
}