module qrcode.qrcodewriter;

import qrcode.renderer.rendererinterface;
import qrcode.encoder.encoder;
import qrcode.common.errorcorrectionlevel;

/**
* QR code writer.
*/
class QrCodeWriter
{
    /**
	* Renderer instance.
	*
	* @var RendererInterface
	*/
    protected RendererInterface renderer;

    this(RendererInterface irender)
    {
        this.renderer = irender;
    }

    /**
	* Sets the renderer used to create a byte stream.
	*
	* @param  RendererInterface $renderer
	* @return Writer
	*/
    public QrCodeWriter setRenderer(RendererInterface renderer)
    {
        this.renderer = renderer;
        return this;
    }
    /**
	* Gets the renderer used to create a byte stream.
	*
	* @return RendererInterface
	*/
    public RendererInterface getRenderer()
    {
        return this.renderer;
    }

    /**
	* Writes QR code and returns it as string.
	*
	* Content is a string which *should* be encoded in UTF-8, in case there are
	* non ASCII-characters present.
	*
	* @param  string  $content
	* @param  string  $encoding
	* @param  integer $ecLevel
	* @return string
	* @throws Exception\InvalidArgumentException
	*/
    public string writeString(string content, string encoding = Encoder.DEFAULT_BYTE_MODE_ECODING,
            ErrorCorrectionLevel ecLevel = ErrorCorrectionLevel.L)
    {
        if (content.length == 0)
        {
            throw new Exception("Found empty contents");
        }
        auto qrCode = Encoder.encode(content, ecLevel, encoding);
        return this.getRenderer().render(qrCode);
    }

    /**
	* Writes QR code to a file.
	*
	* @see    Writer::writeString()
	* @param  string  $content
	* @param  string  $filename
	* @param  string  $encoding
	* @param  integer $ecLevel
	* @return void
	*/
    public void writeFile(string content, string filename, string encoding = Encoder.DEFAULT_BYTE_MODE_ECODING,
            ErrorCorrectionLevel ecLevel = ErrorCorrectionLevel.L)
    {
        import std.file;

        write(filename, this.writeString(content, encoding, ecLevel));
    }
}