/**
 * view
 * @return {[type]} [description]
 */
module.exports = Class(function(){
  'use strict';
  return {
    tVar: {},
    init: function(http){
      this.http = http;
    },
    /**
     * 给变量赋值
     * @param  {[type]} name  [description]
     * @param  {[type]} value [description]
     * @return {[type]}       [description]
     */
    assign: function(name, value){
      if (name === undefined) {
        return this.tVar;
      }
      if (isString(name) && arguments.length === 1) {
        return this.tVar[name];
      }
      if (isObject(name)) {
        this.tVar = extend(this.tVar, name);
      }else{
        this.tVar[name] = value;
      }
    },
    /**
     * 获取变量的值
     * @param  {[type]} name [description]
     * @return {[type]}      [description]
     */
    get: function(name){
      if (!name) {
        return this.tVar;
      }
      return this.tVar[name];
    },
    /**
     * 输出模版文件内容
     * @param  {[type]} templateFile [description]
     * @param  {[type]} charset      [description]
     * @param  {[type]} contentType  [description]
     * @param  {[type]} content      [description]
     * @return {[type]}              [description]
     */
    display: function(templateFile, charset, contentType, content){
      var self = this;
      return tag('view_init', this.http).then(function(){
        return self.fetch(templateFile, content);
      }).then(function(content){
        self.render(content, charset, contentType);
        return tag('view_end', self.http, content);
      }).then(function(){
        return self.http.end();
      }).catch(function(){
        return self.http.end();
      });
    },
    /**
     * 渲染模版
     * @param  {[type]} content     [description]
     * @param  {[type]} charset     [description]
     * @param  {[type]} contentType [description]
     * @return {[type]}             [description]
     */
    render: function(content, charset, contentType){
      if (!this.http.cthIsSend) {
        if (charset === undefined) {
          charset = C('encoding');
        }
        if (contentType === undefined) {
          contentType = C('tpl_content_type');
        }
        this.http.setHeader('Content-Type', contentType + '; charset=' + charset);
      }
      if (C('show_exec_time')) {
        this.http.sendTime('Exec-Time');
      }
      this.http.echo(content || '', C('encoding'));
    },
    /**
     * 获取模版文件内容
     * @param  {[type]} templateFile [description]
     * @param  {[type]} content      [description]
     * @return {[type]}              [description]
     */
    fetch: function(templateFile, content){
      var self = this;
      var promise = getPromise('');
      if (content === undefined) {
        promise = tag('view_template', this.http, templateFile).then(function(file){
          if (file && isFile(file)) {
            templateFile = file;
          }
        });
      }
      return promise.then(function(){
        if (!templateFile) {
          return '';
        }
        return tag('view_parse', self.http, {
          'var': self.tVar,
          'file': templateFile,
          'content': content
        }).then(function(content){
          return tag('view_filter', self.http, content);
        });
      }).catch(function(err){
        //输出模版解析异常
        console.log(isError(err) ? err.stack : err);
      });
    }
  };
});