<?php
/**
 * Copyright (c) 2013-2016
 *
 * @category  Library
 * @package   Dwoo\Plugins\Blocks
 * @author    Jordi Boggiano <j.boggiano@seld.be>
 * @author    David Sanchez <david38sanchez@gmail.com>
 * @copyright 2008-2013 Jordi Boggiano
 * @copyright 2013-2016 David Sanchez
 * @license   http://dwoo.org/LICENSE Modified BSD License
 * @version   1.3.0
 * @date      2016-09-19
 * @link      http://dwoo.org/
 */

namespace Dwoo\Plugins\Blocks;

use Dwoo\Compiler;
use Dwoo\IElseable;
use Dwoo\Block\Plugin as BlockPlugin;
use Dwoo\ICompilable\Block as ICompilableBlock;
use Dwoo\Compilation\Exception as CompilationException;

/**
 * Conditional block, the syntax is very similar to the php one, allowing () || && and
 * other php operators. Additional operators and their equivalent php syntax are as follow :.
 * eq -> ==
 * neq or ne -> !=
 * gte or ge -> >=
 * lte or le -> <=
 * gt -> >
 * lt -> <
 * mod -> %
 * not -> !
 * X is [not] div by Y -> (X % Y) == 0
 * X is [not] even [by Y] -> (X % 2) == 0 or ((X/Y) % 2) == 0
 * X is [not] odd [by Y] -> (X % 2) != 0 or ((X/Y) % 2) != 0
 * This software is provided 'as-is', without any express or implied warranty.
 * In no event will the authors be held liable for any damages arising from the use of this software.
 */
class PluginIf extends BlockPlugin implements ICompilableBlock, IElseable
{
    /**
     * @param array $rest
     */
    public function init(array $rest)
    {
    }

    /**
     * @param array    $params
     * @param array    $tokens
     * @param Compiler $compiler
     *
     * @return array
     * @throws CompilationException
     */
    public static function replaceKeywords(array $params, array $tokens, Compiler $compiler)
    {
        $p = array();

        foreach($params as $k => $v) {
            $v = (string)$v;
            if (substr($v, 0, 1) === '"' || substr($v, 0, 1) === '\'') {
                $vmod = strtolower(substr($v, 1, - 1));
            } else {
                $vmod = strtolower($v);
            }
            switch ($vmod) {

                case 'and':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '&&';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'or':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '||';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'xor':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '^';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'eq':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '==';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'ne':
                case 'neq':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '!=';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'gte':
                case 'ge':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '>=';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'lte':
                case 'le':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '<=';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'gt':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '>';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'lt':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '<';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'mod':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '%';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case 'not':
                    if ($tokens[$k] === Compiler::T_UNQUOTED_STRING) {
                        $p[] = '!';
                    } else {
                        $p[] = $v;
                    }
                    break;
                case '<>':
                    $p[] = '!=';
                    break;
                case '==':
                case '!=':
                case '>=':
                case '<=':
                case '>':
                case '<':
                case '===':
                case '!==':
                case '%':
                case '!':
                case '^':
                    $p[] = $vmod;
                    break;
                case 'is':
                    if ($tokens[$k] !== Compiler::T_UNQUOTED_STRING) {
                        $p[] = $v;
                        break;
                    }
                    if (isset($params[$k + 1]) && strtolower(trim($params[$k + 1], '"\'')) === 'not' && $tokens[$k + 1] === Compiler::T_UNQUOTED_STRING) {
                        $negate = true;
                        next($params);
                    } else {
                        $negate = false;
                    }
                    $ptr = 1 + (int)$negate;
                    if ($tokens[$k + $ptr] !== Compiler::T_UNQUOTED_STRING) {
                        break;
                    }
                    if (!isset($params[$k + $ptr])) {
                        $params[$k + $ptr] = '';
                    } else {
                        $params[$k + $ptr] = trim($params[$k + $ptr], '"\'');
                    }
                    switch ($params[$k + $ptr]) {

                        case 'div':
                            if (isset($params[$k + $ptr + 1]) && strtolower(trim($params[$k + $ptr + 1], '"\'')) === 'by') {
                                $p[] = ' % ' . $params[$k + $ptr + 2] . ' ' . ($negate ? '!' : '=') . '== 0';
                                next($params);
                                next($params);
                                next($params);
                            } else {
                                throw new CompilationException($compiler, 'If : Syntax error : syntax should be "if $a is [not] div by $b", found ' . $params[$k - 1] . ' is ' . ($negate ? 'not ' : '') . 'div ' . $params[$k + $ptr + 1] . ' ' . $params[$k + $ptr + 2]);
                            }
                            break;
                        case 'even':
                            $a = array_pop($p);
                            if (isset($params[$k + $ptr + 1]) && strtolower(trim($params[$k + $ptr + 1], '"\'')) === 'by') {
                                $b   = $params[$k + $ptr + 2];
                                $p[] = '(' . $a . ' / ' . $b . ') % 2 ' . ($negate ? '!' : '=') . '== 0';
                                next($params);
                                next($params);
                            } else {
                                $p[] = $a . ' % 2 ' . ($negate ? '!' : '=') . '== 0';
                            }
                            next($params);
                            break;
                        case 'odd':
                            $a = array_pop($p);
                            if (isset($params[$k + $ptr + 1]) && strtolower(trim($params[$k + $ptr + 1], '"\'')) === 'by') {
                                $b   = $params[$k + $ptr + 2];
                                $p[] = '(' . $a . ' / ' . $b . ') % 2 ' . ($negate ? '=' : '!') . '== 0';
                                next($params);
                                next($params);
                            } else {
                                $p[] = $a . ' % 2 ' . ($negate ? '=' : '!') . '== 0';
                            }
                            next($params);
                            break;
                        default:
                            throw new CompilationException($compiler, 'If : Syntax error : syntax should be "if $a is [not] (div|even|odd) [by $b]", found ' . $params[$k - 1] . ' is ' . $params[$k + $ptr + 1]);
                    }
                    break;
                default:
                    $p[] = $v;
            }
        }

        return $p;
    }

    /**
     * @param Compiler $compiler
     * @param array    $params
     * @param string   $prepend
     * @param string   $append
     * @param string   $type
     *
     * @return string
     */
    public static function preProcessing(Compiler $compiler, array $params, $prepend, $append, $type)
    {
        return '';
    }

    /**
     * @param Compiler $compiler
     * @param array    $params
     * @param string   $prepend
     * @param string   $append
     * @param string   $content
     *
     * @return string
     */
    public static function postProcessing(Compiler $compiler, array $params, $prepend, $append, $content)
    {
        $tokens = $compiler->getParamTokens($params);
        $params = $compiler->getCompiledParams($params);
        $pre    = Compiler::PHP_OPEN . 'if (' . implode(' ', self::replaceKeywords($params['*'], $tokens['*'], $compiler)) . ") {\n" . Compiler::PHP_CLOSE;

        $post = Compiler::PHP_OPEN . "\n}" . Compiler::PHP_CLOSE;

        if (isset($params['hasElse'])) {
            $post .= $params['hasElse'];
        }

        return $pre . $content . $post;
    }
}