<?php

class UOJBlogEditor {
	public $type = 'blog';
	public $name;
	public $blog_url;
	public $save;
	public $cur_data = array();
	public $post_data = array();
	public $show_editor = true;
	public $show_tags = true;
	
	public $label_text = array(
		'title' => '标题',
		'tags' => '标签（多个标签用逗号隔开）',
		'content' => '内容',
		'view blog' => '查看博客',
		'blog visibility' => '博客可见性',
		'private' => '未公开',
		'public' => '公开'
	);
	
	public $validator = array();
	
	function __construct() {
		global $REQUIRE_LIB;
		$REQUIRE_LIB['blog-editor'] = '';
		
		$this->validator = array(
			'title' => function(&$title) {
				if ($title == '') {
					return '标题不能为空';
				}
				if (strlen($title) > 100) {
					return '标题不能超过 100 个字节';
				}
				if (HTML::escape($title) === '') {
					return '无效编码';
				}
				return '';
			},
			'content_md' => function(&$content_md) {
				if (strlen($content_md) > 1000000) {
					return '内容过长';
				}
				return '';
			},
			'tags' => function(&$tags) {
				$tags = str_replace('，', ',', $tags);
				$tags_raw = explode(',', $tags);
				if (count($tags_raw) > 10) {
					return '标签个数不能超过10';
				}
				$tags = array();
				foreach ($tags_raw as $tag) {
					$tag = trim($tag);
					if (strlen($tag) == 0) {
						continue;
					}
					if (strlen($tag) > 30) {
						return '标签 “' . HTML::escape($tag) .'” 太长';
					}
					if (in_array($tag, $tags, true)) {
						return '标签 “' . HTML::escape($tag) .'” 重复出现';
					}
					$tags[] = $tag;
				}
				return '';
			}
		);
	}
	
	public function validate($name) {
		if (!isset($_POST["{$this->name}_{$name}"])) {
			return '不能为空';
		}
		$this->post_data[$name] = $_POST["{$this->name}_{$name}"];
		$val = $this->validator[$name];
		return $val($this->post_data[$name]);
	}
	private function receivePostData() {
		$errors = array();

		$keys = array('title');
		if ($this->show_tags) {
			$keys[] = 'tags';
		}
		if ($this->show_editor) {
			$keys[] = 'content_md';
		}
		foreach ($keys as $name) {
			$cur_err = $this->validate($name);
			if ($cur_err) {
				$errors[$name] = $cur_err;
			}
		}
		if ($errors) {
			die(json_encode($errors));
		}
		crsf_defend();
		
		$this->post_data['is_hidden'] = isset($_POST["{$this->name}_is_hidden"]) ? 1 : 0;
		
		$purifier = HTML::pruifier();
		
		$this->post_data['title'] = HTML::escape($this->post_data['title']);
		
		if ($this->show_editor) {
			if ($this->type == 'blog') {
				$content_md = $_POST[$this->name . '_content_md'];
				try {
					$v8 = new V8Js('POST');
					$v8->content_md = $this->post_data['content_md'];
					$v8->executeString(file_get_contents($_SERVER['DOCUMENT_ROOT'] . '/js/marked.js'), 'marked.js');
					$this->post_data['content'] = $v8->executeString('marked(POST.content_md)');
				} catch (V8JsException $e) {
					die(json_encode(array('content_md' => '未知错误')));
				}

				if (preg_match('/^.*<!--.*readmore.*-->.*$/m', $this->post_data['content'], $matches, PREG_OFFSET_CAPTURE)) {
					$content_less = substr($this->post_data['content'], 0, $matches[0][1]);
					$content_more = substr($this->post_data['content'], $matches[0][1] + strlen($matches[0][0]));
					$this->post_data['content'] = $purifier->purify($content_less).'<!-- readmore -->'.$purifier->purify($content_more);
				} else {
					$this->post_data['content'] = $purifier->purify($this->post_data['content']);
				}
			} elseif ($this->type == 'slide') {
				$content_array = yaml_parse($this->post_data['content_md']);
				if ($content_array === false || !is_array($content_array)) {
					die(json_encode(array('content_md' => '不合法的 YAML 格式')));
				}
			
				try {
					$v8 = new V8Js('PHP');
					$v8->executeString(file_get_contents($_SERVER['DOCUMENT_ROOT'] . '/js/marked.js'), 'marked.js');
					$v8->executeString(<<<EOD
marked.setOptions({
	getLangClass: function(lang) {
		lang = lang.toLowerCase();
		switch (lang) {
			case 'c': return 'c';
			case 'c++': return 'cpp';
			case 'pascal': return 'pascal';
			default: return lang;
		}
	},
	getElementClass: function(tok) {
		switch (tok.type) {
			case 'list_item_start':
				return 'fragment';
			case 'loose_item_start':
				return 'fragment';
			default:
				return null;
		}
	}
})
EOD
					);
				} catch (V8JsException $e) {
					die(json_encode(array('content_md' => '未知错误')));
				}
			
				$marked = function($md) use ($v8, $purifier) {
					try {
						$v8->md = $md;
						return $purifier->purify($v8->executeString('marked(PHP.md)'));
					} catch (V8JsException $e) {
						die(json_encode(array('content_md' => '未知错误')));
					}
				};
			
				$config = array();
				$this->post_data['content'] = '';
				foreach ($content_array as $slide_name => $slide_content) {
					if (is_array($slide_content) && is_array($slide_content['config'])) {
						foreach (array('theme') as $config_key) {
							if (is_string($slide_content['config'][$config_key]) && strlen($slide_content['config'][$config_key]) <= 30) {
								$config[$config_key] = $slide_content['config'][$config_key];
							}
						}
						continue;
					}
				
					$this->post_data['content'] .= '<section>';
				
					if (is_string($slide_content)) {
						$this->post_data['content'] .= $marked($slide_content);
					} elseif (is_array($slide_content)) {
						if (is_array($slide_content['children'])) {
							foreach ($slide_content['children'] as $cslide_name => $cslide_content) {
								$this->post_data['content'] .= '<section>';
								$this->post_data['content'] .= $marked($cslide_content);
								$this->post_data['content'] .= '</section>';
							}
						}
					}
					$this->post_data['content'] .= "</section>\n";
				}
				$this->post_data['content'] = json_encode($config) . "\n" . $this->post_data['content'];
			}
		}
	}
	
	public function handleSave() {
		$save = $this->save;
		$this->receivePostData();
		$ret = $save($this->post_data);
		if (!$ret) {
			$ret = array();
		}
		
		if (isset($_POST['need_preview'])) {
			ob_start();
			if ($this->type == 'blog') {
				echoUOJPageHeader('博客预览', array('ShowPageHeader' => false, 'REQUIRE_LIB' => array('mathjax' => '', 'shjs' => '')));
				echo '<link rel="stylesheet" type="text/css" href="' . HTML::url('/css/markdown.css') . '">';
				echo '<article class="markdown-body">';
				echo $this->post_data['content'];
				echo '</article>';
				echoUOJPageFooter(array('ShowPageFooter' => false));
			} elseif ($this->type == 'slide') {
				uojIncludeView('slide', array_merge(
					UOJContext::pageConfig(),
					array(
						'PageTitle' => '幻灯片预览',
						'content' => $this->post_data['content']
					)
				));
			}
			$ret['html'] = ob_get_contents();
			ob_end_clean();
		}
		
		die(json_encode($ret));
	}
	
	public function runAtServer() {
		if (isset($_POST["save-{$this->name}"])) {
			$this->handleSave();
		}
	}
	public function printHTML() {
		global $REQUIRE_LIB;
		
		uojIncludeView('blog-editor', array('editor' => $this, 'REQUIRE_LIB' => $REQUIRE_LIB));
	}
}