<?php
/**
 * Created by PhpStorm.
 * User: robin
 * Date: 10/22/15
 * Time: 9:59 PM
 */

namespace Luticate\Doc\Business;

use Exception;

class DocBlock {

    public $docblock,
        $description = null,
        $all_params = array();

    /**
     * Parses a docblock;
     */
    function __construct($docblock) {
        if( !is_string($docblock) ) {
            throw new Exception("DocBlock expects first parameter to be a string");
        }

        $this->docblock = $docblock;
        $this->parse_block();
    }

    /**
     * An alias to __call();
     * allows a better DSL
     *
     * @param string $param_name
     * @return mixed
     */
    public function __get($param_name) {
        return $this->$param_name();
    }

    /**
     * Checks if the param exists
     *
     * @param string $param_name
     * @return mixed
     */
    public function __call($param_name, $values = null) {
        if( $param_name == "description" ) {
            return $this->description;
        }else if( isset($this->all_params[$param_name]) ) {
            $params = $this->all_params[$param_name];

            if( count($params) == 1 ) {
                return $params[0];
            }else {
                return $params;
            }
        }

        return null;
    }

    /**
     * Parse each line in the docblock
     * and store the params in `$this->all_params`
     * and the rest in `$this->description`
     */
    private function parse_block() {
        // split at each line
        foreach(preg_split("/(\r?\n)/", $this->docblock) as $line){

            // if starts with an asterisk
            if( preg_match('/^(?=\s+?\*[^\/])(.+)/', $line, $matches) ) {

                $info = $matches[1];

                // remove wrapping whitespace
                $info = trim($info);

                // remove leading asterisk
                $info = preg_replace('/^(\*\s+?)/', '', $info);

                // if it doesn't start with an "@" symbol
                // then add to the description
                if( $info[0] !== "@" ) {
                    $this->description .= "\n$info";
                    continue;
                }else {
                    // get the name of the param
                    if (preg_match('/@param +\\$([^ ]+) +([^ ]+) +(.*)$/', $info, $matches) == 1) {
                        $param_name = $matches[1];
                        $param_type = $matches[2];
                        $value = $matches[3];


                        // push the param value into place
                        $this->all_params[$param_name] = [
                            "name" => $param_name,
                            "param_type" => $param_type,
                            "description" => $value
                        ];

                        continue;
                    }
                }
            }
        }
    }
}