/**
 * Paging 组件
 * @description 基于laytpl 、laypage、layer 封装的组件
 * @author Van zheng_jinfan@126.com
 * @link http://m.zhengjinfan.cn
 * @license MIT
 * @version 1.0.1
 */
layui.define(['layer', 'laypage', 'laytpl'], function(exports) {
	"use strict";
	var $ = layui.jquery,
		layer = parent.layui.layer === undefined ? layui.layer : parent.layui.layer,
		laytpl = layui.laytpl;

	var Paging = function() {
		this.config = {
			url: undefined, //数据远程地址
			type: 'POST', //数据的获取方式  get or post
			elem: undefined, //内容容器
			params: {}, //获取数据时传递的额外参数
			openWait: false, //加载数据时是否显示等待框 
			tempElem: undefined, //模板容器
			tempType: 0,
			paged: true,
			pageConfig: { //参数应该为object类型
				elem: undefined,
				pageSize: 15 //分页大小
			},
			success: undefined, //type:function
			fail: undefined, //type:function
			complate: undefined, //type:function
			serverError: function(xhr, status, error) { //ajax的服务错误
				throwError("错误提示： " + xhr.status + " " + xhr.statusText);
			}
		};
	};
	/**
	 * 版本号
	 */
	Paging.prototype.v = '1.0.2';

	/**
	 * 设置
	 * @param {Object} options
	 */
	Paging.prototype.set = function(options) {
		var that = this;
		$.extend(true, that.config, options);
		return that;
	};
	/**
	 * 初始化
	 * @param {Object} options
	 */
	Paging.prototype.init = function(options) {
		var that = this;
		$.extend(true, that.config, options);
		var _config = that.config;
		if(_config.url === undefined) {
			throwError('Paging Error:请配置远程URL!');
		}
		if(_config.elem === undefined) {
			throwError('Paging Error:请配置参数elem!');
		}
		if($(_config.elem).length === 0) {
			throwError('Paging Error:找不到配置的容器elem!');
		}
		if(_config.tempType === 0) {
			if(_config.tempElem === undefined) {
				throwError('Paging Error:请配置参数tempElem!');
			}
			if($(_config.tempElem).length === 0) {
				throwError('Paging Error:找不到配置的容器tempElem!');
			}
		}
		if(_config.paged) {
			var _pageConfig = _config.pageConfig;
			if(_pageConfig.elem === undefined) {
				throwError('Paging Error:请配置参数pageConfig.elem!');
			}
		}
		if(_config.type.toUpperCase() !== 'GET' && _config.type.toUpperCase() !== 'POST') {
			throwError('Paging Error:type参数配置出错，只支持GET或都POST');
		}
		that.get({
			pageIndex: 1,
			pageSize: _config.pageConfig.pageSize
		});

		return that;
	};
	/**
	 * 获取数据
	 * @param {Object} options
	 */
	Paging.prototype.get = function(options) {
		var that = this;
		var _config = that.config;
		var loadIndex = undefined;
		if(_config.openWait) {
			loadIndex = layer.load(2);
		}
		//默认参数
		var df = {
			pageIndex: 1,
			pageSize: _config.pageConfig.pageSize
		};
		$.extend(true, _config.params, df, options);
		$.ajax({
			type: _config.type,
			url: _config.url,
			data: _config.params,
			dataType: 'json',
			success: function(result, status, xhr) {
				if(result.code === 0) {
					//获取模板
					var tpl = _config.tempType === 0 ? $(_config.tempElem).html(): _config.tempElem;
					//渲染数据
					laytpl(tpl).render(result, function(html) {
						$(_config.elem).html(html);
					});
					if(_config.paged) {
						if(result.count === null || result.count === 0) {
							throwError('Paging Error:请返回数据总数！');
							return;
						}
						var _pageConfig = _config.pageConfig;
						var pageSize = _pageConfig.pageSize;
						var pages = result.count % pageSize == 0 ?
							(result.count / pageSize) : (result.count / pageSize + 1);

						var defaults = {
							cont: $(_pageConfig.elem),
							curr: _config.params.pageIndex,
							pages: pages,
							jump: function(obj, first) {
								//得到了当前页，用于向服务端请求对应数据
								var curr = obj.curr;
								if(!first) {
									that.get({
										pageIndex: curr,
										pageSize: pageSize
									});
								}
							}
						};
						$.extend(defaults, _pageConfig); //参数合并
						layui.laypage(defaults);
					}
					if(_config.success) {
						_config.success(); //渲染成功
					}
				} else {
					if(_config.fail) {
						_config.fail(result.msg); //获取数据失败
					}
				}
				if(_config.complate) {
					_config.complate(); //渲染完成
				}
				if(loadIndex !== undefined)
					layer.close(loadIndex); //关闭等待层
			},
			error: function(xhr, status, error) {
				if(loadIndex !== undefined)
					layer.close(loadIndex); //关闭等待层
				_config.serverError(xhr, status, error); //服务器错误
			}
		});
	};
	/**
	 * 抛出一个异常错误信息
	 * @param {String} msg
	 */
	function throwError(msg) {
		throw new Error(msg);
	};

	var paging = new Paging();
	exports('paging', function(options) {
		return paging.set(options);
	});
});