<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\TextData;

use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
use PhpOffice\PhpSpreadsheet\Calculation\Exception as CalcExp;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
use PhpOffice\PhpSpreadsheet\Shared\StringHelper;

class Extract
{
    use ArrayEnabled;

    /**
     * LEFT.
     *
     * @param mixed $value String value from which to extract characters
     *                         Or can be an array of values
     * @param mixed $chars The number of characters to extract (as an integer)
     *                         Or can be an array of values
     *
     * @return array|string The joined string
     *         If an array of values is passed for the $value or $chars arguments, then the returned result
     *            will also be an array with matching dimensions
     */
    public static function left($value, $chars = 1)
    {
        if (is_array($value) || is_array($chars)) {
            return self::evaluateArrayArguments([self::class, __FUNCTION__], $value, $chars);
        }

        try {
            $value = Helpers::extractString($value);
            $chars = Helpers::extractInt($chars, 0, 1);
        } catch (CalcExp $e) {
            return $e->getMessage();
        }

        return mb_substr($value ?? '', 0, $chars, 'UTF-8');
    }

    /**
     * MID.
     *
     * @param mixed $value String value from which to extract characters
     *                         Or can be an array of values
     * @param mixed $start Integer offset of the first character that we want to extract
     *                         Or can be an array of values
     * @param mixed $chars The number of characters to extract (as an integer)
     *                         Or can be an array of values
     *
     * @return array|string The joined string
     *         If an array of values is passed for the $value, $start or $chars arguments, then the returned result
     *            will also be an array with matching dimensions
     */
    public static function mid($value, $start, $chars)
    {
        if (is_array($value) || is_array($start) || is_array($chars)) {
            return self::evaluateArrayArguments([self::class, __FUNCTION__], $value, $start, $chars);
        }

        try {
            $value = Helpers::extractString($value);
            $start = Helpers::extractInt($start, 1);
            $chars = Helpers::extractInt($chars, 0);
        } catch (CalcExp $e) {
            return $e->getMessage();
        }

        return mb_substr($value ?? '', --$start, $chars, 'UTF-8');
    }

    /**
     * RIGHT.
     *
     * @param mixed $value String value from which to extract characters
     *                         Or can be an array of values
     * @param mixed $chars The number of characters to extract (as an integer)
     *                         Or can be an array of values
     *
     * @return array|string The joined string
     *         If an array of values is passed for the $value or $chars arguments, then the returned result
     *            will also be an array with matching dimensions
     */
    public static function right($value, $chars = 1)
    {
        if (is_array($value) || is_array($chars)) {
            return self::evaluateArrayArguments([self::class, __FUNCTION__], $value, $chars);
        }

        try {
            $value = Helpers::extractString($value);
            $chars = Helpers::extractInt($chars, 0, 1);
        } catch (CalcExp $e) {
            return $e->getMessage();
        }

        return mb_substr($value ?? '', mb_strlen($value ?? '', 'UTF-8') - $chars, $chars, 'UTF-8');
    }

    /**
     * TEXTBEFORE.
     *
     * @param mixed $text the text that you're searching
     *                    Or can be an array of values
     * @param null|array|string $delimiter the text that marks the point before which you want to extract
     *                                 Multiple delimiters can be passed as an array of string values
     * @param mixed $instance The instance of the delimiter after which you want to extract the text.
     *                            By default, this is the first instance (1).
     *                            A negative value means start searching from the end of the text string.
     *                        Or can be an array of values
     * @param mixed $matchMode Determines whether the match is case-sensitive or not.
     *                           0 - Case-sensitive
     *                           1 - Case-insensitive
     *                        Or can be an array of values
     * @param mixed $matchEnd Treats the end of text as a delimiter.
     *                          0 - Don't match the delimiter against the end of the text.
     *                          1 - Match the delimiter against the end of the text.
     *                        Or can be an array of values
     * @param mixed $ifNotFound value to return if no match is found
     *                             The default is a #N/A Error
     *                          Or can be an array of values
     *
     * @return mixed|mixed[] the string extracted from text before the delimiter; or the $ifNotFound value
     *         If an array of values is passed for any of the arguments, then the returned result
     *            will also be an array with matching dimensions
     */
    public static function before($text, $delimiter, $instance = 1, $matchMode = 0, $matchEnd = 0, $ifNotFound = '#N/A')
    {
        if (is_array($text) || is_array($instance) || is_array($matchMode) || is_array($matchEnd) || is_array($ifNotFound)) {
            return self::evaluateArrayArgumentsIgnore([self::class, __FUNCTION__], 1, $text, $delimiter, $instance, $matchMode, $matchEnd, $ifNotFound);
        }

        $text = Helpers::extractString($text ?? '');
        $instance = (int) $instance;
        $matchMode = (int) $matchMode;
        $matchEnd = (int) $matchEnd;

        $split = self::validateTextBeforeAfter($text, $delimiter, $instance, $matchMode, $matchEnd, $ifNotFound);
        if (is_array($split) === false) {
            return $split;
        }
        if (Helpers::extractString(Functions::flattenSingleValue($delimiter ?? '')) === '') {
            return ($instance > 0) ? '' : $text;
        }

        // Adjustment for a match as the first element of the split
        $flags = self::matchFlags($matchMode);
        $delimiter = self::buildDelimiter($delimiter);
        $adjust = preg_match('/^' . $delimiter . "\$/{$flags}", $split[0]);
        $oddReverseAdjustment = count($split) % 2;

        $split = ($instance < 0)
            ? array_slice($split, 0, max(count($split) - (abs($instance) * 2 - 1) - $adjust - $oddReverseAdjustment, 0))
            : array_slice($split, 0, $instance * 2 - 1 - $adjust);

        return implode('', $split);
    }

    /**
     * TEXTAFTER.
     *
     * @param mixed $text the text that you're searching
     * @param null|array|string $delimiter the text that marks the point before which you want to extract
     *                                 Multiple delimiters can be passed as an array of string values
     * @param mixed $instance The instance of the delimiter after which you want to extract the text.
     *                          By default, this is the first instance (1).
     *                          A negative value means start searching from the end of the text string.
     *                        Or can be an array of values
     * @param mixed $matchMode Determines whether the match is case-sensitive or not.
     *                            0 - Case-sensitive
     *                            1 - Case-insensitive
     *                         Or can be an array of values
     * @param mixed $matchEnd Treats the end of text as a delimiter.
     *                          0 - Don't match the delimiter against the end of the text.
     *                          1 - Match the delimiter against the end of the text.
     *                        Or can be an array of values
     * @param mixed $ifNotFound value to return if no match is found
     *                             The default is a #N/A Error
     *                          Or can be an array of values
     *
     * @return mixed|mixed[] the string extracted from text before the delimiter; or the $ifNotFound value
     *         If an array of values is passed for any of the arguments, then the returned result
     *            will also be an array with matching dimensions
     */
    public static function after($text, $delimiter, $instance = 1, $matchMode = 0, $matchEnd = 0, $ifNotFound = '#N/A')
    {
        if (is_array($text) || is_array($instance) || is_array($matchMode) || is_array($matchEnd) || is_array($ifNotFound)) {
            return self::evaluateArrayArgumentsIgnore([self::class, __FUNCTION__], 1, $text, $delimiter, $instance, $matchMode, $matchEnd, $ifNotFound);
        }

        $text = Helpers::extractString($text ?? '');
        $instance = (int) $instance;
        $matchMode = (int) $matchMode;
        $matchEnd = (int) $matchEnd;

        $split = self::validateTextBeforeAfter($text, $delimiter, $instance, $matchMode, $matchEnd, $ifNotFound);
        if (is_array($split) === false) {
            return $split;
        }
        if (Helpers::extractString(Functions::flattenSingleValue($delimiter ?? '')) === '') {
            return ($instance < 0) ? '' : $text;
        }

        // Adjustment for a match as the first element of the split
        $flags = self::matchFlags($matchMode);
        $delimiter = self::buildDelimiter($delimiter);
        $adjust = preg_match('/^' . $delimiter . "\$/{$flags}", $split[0]);
        $oddReverseAdjustment = count($split) % 2;

        $split = ($instance < 0)
            ? array_slice($split, count($split) - (abs($instance + 1) * 2) - $adjust - $oddReverseAdjustment)
            : array_slice($split, $instance * 2 - $adjust);

        return implode('', $split);
    }

    /**
     * @param null|array|string $delimiter
     * @param int $matchMode
     * @param int $matchEnd
     * @param mixed $ifNotFound
     *
     * @return string|string[]
     */
    private static function validateTextBeforeAfter(string $text, $delimiter, int $instance, $matchMode, $matchEnd, $ifNotFound)
    {
        $flags = self::matchFlags($matchMode);
        $delimiter = self::buildDelimiter($delimiter);

        if (preg_match('/' . $delimiter . "/{$flags}", $text) === 0 && $matchEnd === 0) {
            return $ifNotFound;
        }

        $split = preg_split('/' . $delimiter . "/{$flags}", $text, 0, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
        if ($split === false) {
            return ExcelError::NA();
        }

        if ($instance === 0 || abs($instance) > StringHelper::countCharacters($text)) {
            return ExcelError::VALUE();
        }

        if ($matchEnd === 0 && (abs($instance) > floor(count($split) / 2))) {
            return ExcelError::NA();
        } elseif ($matchEnd !== 0 && (abs($instance) - 1 > ceil(count($split) / 2))) {
            return ExcelError::NA();
        }

        return $split;
    }

    /**
     * @param null|array|string $delimiter the text that marks the point before which you want to extract
     *                                 Multiple delimiters can be passed as an array of string values
     */
    private static function buildDelimiter($delimiter): string
    {
        if (is_array($delimiter)) {
            $delimiter = Functions::flattenArray($delimiter);
            $quotedDelimiters = array_map(
                function ($delimiter) {
                    return preg_quote($delimiter ?? '');
                },
                $delimiter
            );
            $delimiters = implode('|', $quotedDelimiters);

            return '(' . $delimiters . ')';
        }

        return '(' . preg_quote($delimiter ?? '') . ')';
    }

    private static function matchFlags(int $matchMode): string
    {
        return ($matchMode === 0) ? 'mu' : 'miu';
    }
}
