<?php

namespace NoccyLabs\GdLabel\Elements;

use NoccyLabs\GdLabel\Element;

class TextElement extends Element
{

    private static $fontCache = [];

    private static function findFont($font)
    {
        if (count(self::$fontCache)==0) {
            self::updateFonts();
        }

        $font = strtolower($font);

        if (array_key_exists($font, self::$fontCache)) {
            return self::$fontCache[$font];
        }
        return false;
    }

    private static function updateFonts()
    {
        exec("fc-list", $output, $ret);
        if ($ret != 0) {
            fprintf(STDERR, "%s\n", join("\n",$output));
            return;
        }
        foreach ($output as $line) {
            $seg = explode(":", $line);
            $file = $seg[0];
            $name = strtolower(trim(preg_replace("/[^A-Za-z0-9 ]/", '', $seg[1])));
            self::$fontCache[$name] = $file;
        }

    }

    protected function draw($gd, int $x, int $y, int $width, int $height, array $params)
    {
        if (($bound = $this->getProp("bind-value"))) {
            $value = array_key_exists($bound, $params)?$params[$bound]:"?{$bound}?";
        } else {
            $value = $this->getProp("value");
        }

        $font = self::findFont("liberation sans");
        if (!$font) {
            return;
        }

        $color = $this->getPropRgb("text-color");

        $size = $this->getProp("font-size", 8);

        $dims = imagettfbbox($size, 0, $font, $value);

        $textAscent = abs($dims[7]);
        $textDescent = abs($dims[1]);
        $textWidth = abs($dims[0])+abs($dims[2]);
        $textHeight = $textAscent+$textDescent;

        imagettftext($gd, $size, 0, $x, $y + $textAscent, $color, $font, $value);
        //imagestring($gd, $size, $x, $y, $value, $color);
        
    }


}