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<?php
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namespace Sabberworm\CSS\Value;
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use Sabberworm\CSS\OutputFormat;
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use Sabberworm\CSS\Parsing\ParserState;
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use Sabberworm\CSS\Parsing\UnexpectedEOFException;
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use Sabberworm\CSS\Parsing\UnexpectedTokenException;
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class Color extends CSSFunction
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{
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    /**
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     * @param array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aColor
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     * @param int $iLineNo
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     */
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    public function __construct(array $aColor, $iLineNo = 0)
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    {
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        parent::__construct(implode('', array_keys($aColor)), $aColor, ',', $iLineNo);
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    }
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    /**
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     * @return Color|CSSFunction
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     *
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     * @throws UnexpectedEOFException
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     * @throws UnexpectedTokenException
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     */
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    public static function parse(ParserState $oParserState)
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    {
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        $aColor = [];
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        if ($oParserState->comes('#')) {
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            $oParserState->consume('#');
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            $sValue = $oParserState->parseIdentifier(false);
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            if ($oParserState->strlen($sValue) === 3) {
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                $sValue = $sValue[0] . $sValue[0] . $sValue[1] . $sValue[1] . $sValue[2] . $sValue[2];
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            } elseif ($oParserState->strlen($sValue) === 4) {
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                $sValue = $sValue[0] . $sValue[0] . $sValue[1] . $sValue[1] . $sValue[2] . $sValue[2] . $sValue[3]
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                    . $sValue[3];
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            }
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            if ($oParserState->strlen($sValue) === 8) {
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                $aColor = [
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                    'r' => new Size(intval($sValue[0] . $sValue[1], 16), null, true, $oParserState->currentLine()),
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                    'g' => new Size(intval($sValue[2] . $sValue[3], 16), null, true, $oParserState->currentLine()),
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                    'b' => new Size(intval($sValue[4] . $sValue[5], 16), null, true, $oParserState->currentLine()),
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                    'a' => new Size(
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                        round(self::mapRange(intval($sValue[6] . $sValue[7], 16), 0, 255, 0, 1), 2),
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                        null,
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                        true,
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                        $oParserState->currentLine()
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                    ),
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                ];
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            } else {
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                $aColor = [
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                    'r' => new Size(intval($sValue[0] . $sValue[1], 16), null, true, $oParserState->currentLine()),
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                    'g' => new Size(intval($sValue[2] . $sValue[3], 16), null, true, $oParserState->currentLine()),
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                    'b' => new Size(intval($sValue[4] . $sValue[5], 16), null, true, $oParserState->currentLine()),
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                ];
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            }
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        } else {
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            $sColorMode = $oParserState->parseIdentifier(true);
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            $oParserState->consumeWhiteSpace();
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            $oParserState->consume('(');
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            $bContainsVar = false;
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            $iLength = $oParserState->strlen($sColorMode);
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            for ($i = 0; $i < $iLength; ++$i) {
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                $oParserState->consumeWhiteSpace();
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                if ($oParserState->comes('var')) {
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                    $aColor[$sColorMode[$i]] = CSSFunction::parseIdentifierOrFunction($oParserState);
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                    $bContainsVar = true;
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                } else {
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                    $aColor[$sColorMode[$i]] = Size::parse($oParserState, true);
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                }
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                if ($bContainsVar && $oParserState->comes(')')) {
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                    // With a var argument the function can have fewer arguments
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                    break;
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                }
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                $oParserState->consumeWhiteSpace();
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                if ($i < ($iLength - 1)) {
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                    $oParserState->consume(',');
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                }
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            }
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            $oParserState->consume(')');
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            if ($bContainsVar) {
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                return new CSSFunction($sColorMode, array_values($aColor), ',', $oParserState->currentLine());
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            }
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        }
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        return new Color($aColor, $oParserState->currentLine());
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    }
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    /**
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     * @param float $fVal
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     * @param float $fFromMin
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     * @param float $fFromMax
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     * @param float $fToMin
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     * @param float $fToMax
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     *
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     * @return float
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     */
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    private static function mapRange($fVal, $fFromMin, $fFromMax, $fToMin, $fToMax)
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    {
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        $fFromRange = $fFromMax - $fFromMin;
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        $fToRange = $fToMax - $fToMin;
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        $fMultiplier = $fToRange / $fFromRange;
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        $fNewVal = $fVal - $fFromMin;
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        $fNewVal *= $fMultiplier;
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        return $fNewVal + $fToMin;
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    }
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    /**
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     * @return array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string>
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     */
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    public function getColor()
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    {
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        return $this->aComponents;
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    }
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    /**
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     * @param array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aColor
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     *
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     * @return void
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     */
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    public function setColor(array $aColor)
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    {
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        $this->setName(implode('', array_keys($aColor)));
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        $this->aComponents = $aColor;
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    }
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    /**
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     * @return string
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     */
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    public function getColorDescription()
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    {
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        return $this->getName();
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    }
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    /**
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     * @return string
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     */
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    public function __toString()
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    {
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        return $this->render(new OutputFormat());
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    }
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    /**
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     * @return string
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     */
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    public function render(OutputFormat $oOutputFormat)
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    {
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        // Shorthand RGB color values
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        if ($oOutputFormat->getRGBHashNotation() && implode('', array_keys($this->aComponents)) === 'rgb') {
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            $sResult = sprintf(
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                '%02x%02x%02x',
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                $this->aComponents['r']->getSize(),
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                $this->aComponents['g']->getSize(),
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                $this->aComponents['b']->getSize()
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            );
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            return '#' . (($sResult[0] == $sResult[1]) && ($sResult[2] == $sResult[3]) && ($sResult[4] == $sResult[5])
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                    ? "$sResult[0]$sResult[2]$sResult[4]" : $sResult);
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        }
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        return parent::render($oOutputFormat);
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    }
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}