<?php

/**
 * @package php-font-lib
 * @link    https://github.com/dompdf/php-font-lib
 * @author  Fabien Ménager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: Font_Table_glyf.php 46 2012-04-02 20:22:38Z fabien.menager $
 */
namespace DynamicOOOS\FontLib\Glyph;

/**
 * `glyf` font table.
 *
 * @package php-font-lib
 */
class OutlineSimple extends Outline
{
    const ON_CURVE = 0x1;
    const X_SHORT_VECTOR = 0x2;
    const Y_SHORT_VECTOR = 0x4;
    const REPEAT = 0x8;
    const THIS_X_IS_SAME = 0x10;
    const THIS_Y_IS_SAME = 0x20;
    public $instructions;
    public $points;
    function parseData()
    {
        parent::parseData();
        if (!$this->size) {
            return;
        }
        $font = $this->getFont();
        $noc = $this->numberOfContours;
        if ($noc == 0) {
            return;
        }
        $endPtsOfContours = $font->r(array(self::uint16, $noc));
        $instructionLength = $font->readUInt16();
        $this->instructions = $font->r(array(self::uint8, $instructionLength));
        $count = $endPtsOfContours[$noc - 1] + 1;
        // Flags
        $flags = array();
        for ($index = 0; $index < $count; $index++) {
            $flags[$index] = $font->readUInt8();
            if ($flags[$index] & self::REPEAT) {
                $repeats = $font->readUInt8();
                for ($i = 1; $i <= $repeats; $i++) {
                    $flags[$index + $i] = $flags[$index];
                }
                $index += $repeats;
            }
        }
        $points = array();
        foreach ($flags as $i => $flag) {
            $points[$i]["onCurve"] = $flag & self::ON_CURVE;
            $points[$i]["endOfContour"] = \in_array($i, $endPtsOfContours);
        }
        // X Coords
        $x = 0;
        for ($i = 0; $i < $count; $i++) {
            $flag = $flags[$i];
            if ($flag & self::THIS_X_IS_SAME) {
                if ($flag & self::X_SHORT_VECTOR) {
                    $x += $font->readUInt8();
                }
            } else {
                if ($flag & self::X_SHORT_VECTOR) {
                    $x -= $font->readUInt8();
                } else {
                    $x += $font->readInt16();
                }
            }
            $points[$i]["x"] = $x;
        }
        // Y Coords
        $y = 0;
        for ($i = 0; $i < $count; $i++) {
            $flag = $flags[$i];
            if ($flag & self::THIS_Y_IS_SAME) {
                if ($flag & self::Y_SHORT_VECTOR) {
                    $y += $font->readUInt8();
                }
            } else {
                if ($flag & self::Y_SHORT_VECTOR) {
                    $y -= $font->readUInt8();
                } else {
                    $y += $font->readInt16();
                }
            }
            $points[$i]["y"] = $y;
        }
        $this->points = $points;
    }
    public function splitSVGPath($path)
    {
        \preg_match_all('/([a-z])|(-?\\d+(?:\\.\\d+)?)/i', $path, $matches, \PREG_PATTERN_ORDER);
        return $matches[0];
    }
    public function makePoints($path)
    {
        $path = $this->splitSVGPath($path);
        $l = \count($path);
        $i = 0;
        $points = array();
        while ($i < $l) {
            switch ($path[$i]) {
                // moveTo
                case "M":
                    $points[] = array("onCurve" => \true, "x" => $path[++$i], "y" => $path[++$i], "endOfContour" => \false);
                    break;
                // lineTo
                case "L":
                    $points[] = array("onCurve" => \true, "x" => $path[++$i], "y" => $path[++$i], "endOfContour" => \false);
                    break;
                // quadraticCurveTo
                case "Q":
                    $points[] = array("onCurve" => \false, "x" => $path[++$i], "y" => $path[++$i], "endOfContour" => \false);
                    $points[] = array("onCurve" => \true, "x" => $path[++$i], "y" => $path[++$i], "endOfContour" => \false);
                    break;
                // closePath
                /** @noinspection PhpMissingBreakStatementInspection */
                case "z":
                    $points[\count($points) - 1]["endOfContour"] = \true;
                default:
                    $i++;
                    break;
            }
        }
        return $points;
    }
    function encode()
    {
        if (empty($this->points)) {
            return parent::encode();
        }
        return $this->size = $this->encodePoints($this->points);
    }
    public function encodePoints($points)
    {
        $endPtsOfContours = array();
        $flags = array();
        $coords_x = array();
        $coords_y = array();
        $last_x = 0;
        $last_y = 0;
        $xMin = $yMin = 0xffff;
        $xMax = $yMax = -0xffff;
        foreach ($points as $i => $point) {
            $flag = 0;
            if ($point["onCurve"]) {
                $flag |= self::ON_CURVE;
            }
            if ($point["endOfContour"]) {
                $endPtsOfContours[] = $i;
            }
            // Simplified, we could do some optimizations
            if ($point["x"] == $last_x) {
                $flag |= self::THIS_X_IS_SAME;
            } else {
                $x = \intval($point["x"]);
                $xMin = \min($x, $xMin);
                $xMax = \max($x, $xMax);
                $coords_x[] = $x - $last_x;
                // int16
            }
            // Simplified, we could do some optimizations
            if ($point["y"] == $last_y) {
                $flag |= self::THIS_Y_IS_SAME;
            } else {
                $y = \intval($point["y"]);
                $yMin = \min($y, $yMin);
                $yMax = \max($y, $yMax);
                $coords_y[] = $y - $last_y;
                // int16
            }
            $flags[] = $flag;
            $last_x = $point["x"];
            $last_y = $point["y"];
        }
        $font = $this->getFont();
        $l = 0;
        $l += $font->writeInt16(\count($endPtsOfContours));
        // endPtsOfContours
        $l += $font->writeFWord(isset($this->xMin) ? $this->xMin : $xMin);
        // xMin
        $l += $font->writeFWord(isset($this->yMin) ? $this->yMin : $yMin);
        // yMin
        $l += $font->writeFWord(isset($this->xMax) ? $this->xMax : $xMax);
        // xMax
        $l += $font->writeFWord(isset($this->yMax) ? $this->yMax : $yMax);
        // yMax
        // Simple glyf
        $l += $font->w(array(self::uint16, \count($endPtsOfContours)), $endPtsOfContours);
        // endPtsOfContours
        $l += $font->writeUInt16(0);
        // instructionLength
        $l += $font->w(array(self::uint8, \count($flags)), $flags);
        // flags
        $l += $font->w(array(self::int16, \count($coords_x)), $coords_x);
        // xCoordinates
        $l += $font->w(array(self::int16, \count($coords_y)), $coords_y);
        // yCoordinates
        return $l;
    }
    public function getSVGContours($points = null)
    {
        $path = "";
        if (!$points) {
            if (empty($this->points)) {
                $this->parseData();
            }
            $points = $this->points;
        }
        $length = empty($points) ? 0 : \count($points);
        $firstIndex = 0;
        $count = 0;
        for ($i = 0; $i < $length; $i++) {
            $count++;
            if ($points[$i]["endOfContour"]) {
                $path .= $this->getSVGPath($points, $firstIndex, $count);
                $firstIndex = $i + 1;
                $count = 0;
            }
        }
        return $path;
    }
    protected function getSVGPath($points, $startIndex, $count)
    {
        $offset = 0;
        $path = "";
        while ($offset < $count) {
            $point = $points[$startIndex + $offset % $count];
            $point_p1 = $points[$startIndex + ($offset + 1) % $count];
            if ($offset == 0) {
                $path .= "M{$point['x']},{$point['y']} ";
            }
            if ($point["onCurve"]) {
                if ($point_p1["onCurve"]) {
                    $path .= "L{$point_p1['x']},{$point_p1['y']} ";
                    $offset++;
                } else {
                    $point_p2 = $points[$startIndex + ($offset + 2) % $count];
                    if ($point_p2["onCurve"]) {
                        $path .= "Q{$point_p1['x']},{$point_p1['y']},{$point_p2['x']},{$point_p2['y']} ";
                    } else {
                        $path .= "Q{$point_p1['x']},{$point_p1['y']}," . $this->midValue($point_p1['x'], $point_p2['x']) . "," . $this->midValue($point_p1['y'], $point_p2['y']) . " ";
                    }
                    $offset += 2;
                }
            } else {
                if ($point_p1["onCurve"]) {
                    $path .= "Q{$point['x']},{$point['y']},{$point_p1['x']},{$point_p1['y']} ";
                } else {
                    $path .= "Q{$point['x']},{$point['y']}," . $this->midValue($point['x'], $point_p1['x']) . "," . $this->midValue($point['y'], $point_p1['y']) . " ";
                }
                $offset++;
            }
        }
        $path .= "z ";
        return $path;
    }
    function midValue($a, $b)
    {
        return $a + ($b - $a) / 2;
    }
}
