<?php

namespace DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Operator;

use DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node;
use DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser;
/**
 * .------------------------------------------------------------------.
 * |          NUL     +      .       /       ;      ?      &      #   |
 * |------------------------------------------------------------------|
 * | first |  ""     ""     "."     "/"     ";"    "?"    "&"    "#"  |
 * | sep   |  ","    ","    "."     "/"     ";"    "&"    "&"    ","  |
 * | named | false  false  false   false   true   true   true   false |
 * | ifemp |  ""     ""     ""      ""      ""     "="    "="    ""   |
 * | allow |   U     U+R     U       U       U      U      U     U+R  |
 * `------------------------------------------------------------------'
 *
 * named = false
 * | 1   |    {/list}    /red,green,blue                  | {$value}*(?:,{$value}+)*
 * | 2   |    {/list*}   /red/green/blue                  | {$value}+(?:{$sep}{$value}+)*
 * | 3   |    {/keys}    /semi,%3B,dot,.,comma,%2C        | /(\w+,?)+
 * | 4   |    {/keys*}   /semi=%3B/dot=./comma=%2C        | /(?:\w+=\w+/?)*
 * named = true
 * | 1   |    {?list}    ?list=red,green,blue             | {name}=(?:\w+(?:,\w+?)*)*
 * | 2   |    {?list*}   ?list=red&list=green&list=blue   | {name}+=(?:{$value}+(?:{sep}{name}+={$value}*))*
 * | 3   |    {?keys}    ?keys=semi,%3B,dot,.,comma,%2C   | (same as 1)
 * | 4   |    {?keys*}   ?semi=%3B&dot=.&comma=%2C        | (same as 2)
 *
 * UNRESERVED
 * ----------
 * RFC 1738 ALPHA | DIGIT | "-" | "." | "_" |     | "$" | "+" | "!" | "*" | "'" | "(" | ")" | ","
 * RFC 3986 ALPHA | DIGIT | "-" | "." | "_" | "~"
 * RFC 6570 ALPHA | DIGIT | "-" | "." | "_" | "~"
 *
 * RESERVED
 * --------
 * RFC 1738 ":" | "/" | "?" |                 | "@" | "!" | "$" | "&" | "'" | "(" | ")" | "*" | "+" | "," | ";" | "=" | "-" | "_" | "." | 
 * RFC 3986 ":" | "/" | "?" | "#" | "[" | "]" | "@" | "!" | "$" | "&" | "'" | "(" | ")" | "*" | "+" | "," | ";" | "="
 * RFC 6570 ":" | "/" | "?" | "#" | "[" | "]" | "@" | "!" | "$" | "&" | "'" | "(" | ")" | "*" | "+" | "," | ";" | "="
 *
 * PHP_QUERY_RFC3986 was added in PHP 5.4.0
 */
abstract class Abstraction
{
    /**
     * start - Variable offset position, level-2 operators start at 1
     *         (exclude operator itself, e.g. {?query})
     * first - If variables found, prepend this value to it
     * named - Whether or not the expansion includes the variable or key name
     * reserved - union of (unreserved / reserved / pct-encoded)
     */
    public $id, $named, $sep, $empty, $reserved, $start, $first;
    protected static $types = array('' => array('sep' => ',', 'named' => false, 'empty' => '', 'reserved' => false, 'start' => 0, 'first' => null), '+' => array('sep' => ',', 'named' => false, 'empty' => '', 'reserved' => true, 'start' => 1, 'first' => null), '.' => array('sep' => '.', 'named' => false, 'empty' => '', 'reserved' => false, 'start' => 1, 'first' => '.'), '/' => array('sep' => '/', 'named' => false, 'empty' => '', 'reserved' => false, 'start' => 1, 'first' => '/'), ';' => array('sep' => ';', 'named' => true, 'empty' => '', 'reserved' => false, 'start' => 1, 'first' => ';'), '?' => array('sep' => '&', 'named' => true, 'empty' => '=', 'reserved' => false, 'start' => 1, 'first' => '?'), '&' => array('sep' => '&', 'named' => true, 'empty' => '=', 'reserved' => false, 'start' => 1, 'first' => '&'), '#' => array('sep' => ',', 'named' => false, 'empty' => '', 'reserved' => true, 'start' => 1, 'first' => '#')), $loaded = array();
    /**
     * gen-delims | sub-delims
     */
    public static $reserved_chars = array('%3A' => ':', '%2F' => '/', '%3F' => '?', '%23' => '#', '%5B' => '[', '%5D' => ']', '%40' => '@', '%21' => '!', '%24' => '$', '%26' => '&', '%27' => "'", '%28' => '(', '%29' => ')', '%2A' => '*', '%2B' => '+', '%2C' => ',', '%3B' => ';', '%3D' => '=');
    /**
     * RFC 3986 Allowed path characters regex except the path delimiter '/'.
     *
     * @var string
     */
    protected static $pathRegex = '(?:[a-zA-Z0-9\\-\\._~!\\$&\'\\(\\)\\*\\+,;=%:@]+|%(?![A-Fa-f0-9]{2}))';
    /**
     * RFC 3986 Allowed query characters regex except the query parameter delimiter '&'.
     *
     * @var string
     */
    protected static $queryRegex = '(?:[a-zA-Z0-9\\-\\._~!\\$\'\\(\\)\\*\\+,;=%:@\\/\\?]+|%(?![A-Fa-f0-9]{2}))';
    public function __construct($id, $named, $sep, $empty, $reserved, $start, $first)
    {
        $this->id = $id;
        $this->named = $named;
        $this->sep = $sep;
        $this->empty = $empty;
        $this->start = $start;
        $this->first = $first;
        $this->reserved = $reserved;
    }
    public abstract function toRegex(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var);
    public function expand(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var, array $params = array())
    {
        $options = $var->options;
        $name = $var->name;
        $is_explode = in_array($options['modifier'], array('*', '%'));
        // skip null
        if (!isset($params[$name])) {
            return null;
        }
        $val = $params[$name];
        // This algorithm is based on RFC6570 http://tools.ietf.org/html/rfc6570
        // non-array, e.g. string
        if (!is_array($val)) {
            return $this->expandString($parser, $var, $val);
        } else {
            if (!$is_explode) {
                return $this->expandNonExplode($parser, $var, $val);
            } else {
                return $this->expandExplode($parser, $var, $val);
            }
        }
    }
    public function expandString(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var, $val)
    {
        $val = (string) $val;
        $options = $var->options;
        $result = null;
        if ($options['modifier'] === ':') {
            $val = substr($val, 0, (int) $options['value']);
        }
        return $result . $this->encode($parser, $var, $val);
    }
    /**
     * Non explode modifier ':'
     *
     * @param Parser $parser
     * @param Node\Variable $var
     * @param array $val
     * @return null|string
     */
    public function expandNonExplode(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var, array $val)
    {
        if (empty($val)) {
            return null;
        }
        return $this->encode($parser, $var, $val);
    }
    /**
     * Explode modifier '*', '%'
     *
     * @param Parser $parser
     * @param Node\Variable $var
     * @param array $val
     * @return null|string
     */
    public function expandExplode(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var, array $val)
    {
        if (empty($val)) {
            return null;
        }
        return $this->encode($parser, $var, $val);
    }
    /**
     * Encodes variable according to spec (reserved or unreserved)
     *
     * @param  Parser        $parser
     * @param  Node\Variable $var
     * @param  mixed         $values
     *
     * @return string encoded string
     */
    public function encode(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var, $values)
    {
        $values = (array) $values;
        $list = isset($values[0]);
        $reserved = $this->reserved;
        $maps = static::$reserved_chars;
        $sep = $this->sep;
        $assoc_sep = '=';
        // non-explode modifier always use ',' as a separator
        if ($var->options['modifier'] !== '*') {
            $assoc_sep = $sep = ',';
        }
        array_walk($values, function (&$v, $k) use($assoc_sep, $reserved, $list, $maps) {
            $encoded = rawurlencode($v);
            // assoc? encode key too
            if (!$list) {
                $encoded = rawurlencode($k) . $assoc_sep . $encoded;
            }
            // rawurlencode is compliant with 'unreserved' set
            if (!$reserved) {
                $v = $encoded;
            } else {
                $v = str_replace(array_keys($maps), $maps, $encoded);
            }
        });
        return implode($sep, $values);
    }
    /**
     * Decodes variable
     *
     * @param  Parser        $parser
     * @param  Node\Variable $var
     * @param  mixed         $values
     *
     * @return string decoded string
     */
    public function decode(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var, $values)
    {
        $single = !is_array($values);
        $values = (array) $values;
        array_walk($values, function (&$v, $k) {
            $v = rawurldecode($v);
        });
        return $single ? reset($values) : $values;
    }
    /**
     * Extracts value from variable
     *
     * @param  Parser        $parser
     * @param  Node\Variable $var
     * @param  string        $data
     * @return string
     */
    public function extract(\DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Parser $parser, \DeliciousBrains\WP_Offload_Media\Gcp\Rize\UriTemplate\Node\Variable $var, $data)
    {
        $value = $data;
        $vals = array_filter(explode($this->sep, $data));
        $options = $var->options;
        switch ($options['modifier']) {
            case '*':
                $data = array();
                foreach ($vals as $val) {
                    if (strpos($val, '=') !== false) {
                        list($k, $v) = explode('=', $val);
                        $data[$k] = $v;
                    } else {
                        $data[] = $val;
                    }
                }
                break;
            case ':':
                break;
            default:
                $data = strpos($data, $this->sep) !== false ? $vals : $value;
        }
        return $this->decode($parser, $var, $data);
    }
    public static function createById($id)
    {
        if (!isset(static::$types[$id])) {
            throw new \Exception("Invalid operator [{$id}]");
        }
        if (isset(static::$loaded[$id])) {
            return static::$loaded[$id];
        }
        $op = static::$types[$id];
        $class = __NAMESPACE__ . '\\' . ($op['named'] ? 'Named' : 'UnNamed');
        return static::$loaded[$id] = new $class($id, $op['named'], $op['sep'], $op['empty'], $op['reserved'], $op['start'], $op['first']);
    }
    public static function isValid($id)
    {
        return isset(static::$types[$id]);
    }
    /**
     * Returns the correct regex given the variable location in the URI
     *
     * @return string
     */
    protected function getRegex()
    {
        switch ($this->id) {
            case '?':
            case '&':
            case '#':
                return self::$queryRegex;
            case ';':
            default:
                return self::$pathRegex;
        }
    }
}
