/**
 * YvanUI
 *
 * Copyright (c) 2018 www.yvanui.com. All rights reserved.
 * @author luoyifan@qq.com
 * @time 2018-12-18 17:16:00
 */
(function ($) {
  /**
   * create date box
   */
  function createBox(target) {
    var state = $.data(target, 'datebox');
    var opts = state.options;

    $(target).addClass('datebox-f').combo($.extend({}, opts, {
      onShowPanel: function () {
        bindEvents(this);
        setButtons(this);
        setCalendar(this);
        setValue(this, $(this).datebox('getText'), true);
        opts.onShowPanel.call(this);
      }
    }));

    /**
     * if the calendar isn't created, create it.
     */
    if (!state.calendar) {
      var panel = $(target).combo('panel').css('overflow', 'hidden');
      panel.panel('options').onBeforeDestroy = function () {
        var c = $(this).find('.calendar-shared');
        if (c.length) {
          c.insertBefore(c[0].pholder);
        }
      };
      var cc = $('<div class="datebox-calendar-inner"></div>').prependTo(panel);
      if (opts.sharedCalendar) {
        var c = $(opts.sharedCalendar);
        if (!c[0].pholder) {
          c[0].pholder = $('<div class="calendar-pholder" style="display:none"></div>').insertAfter(c);
        }
        c.addClass('calendar-shared').appendTo(cc);
        if (!c.hasClass('calendar')) {
          c.calendar();
        }
        state.calendar = c;
      } else {
        state.calendar = $('<div></div>').appendTo(cc).calendar();
      }

      $.extend(state.calendar.calendar('options'), {
        fit: true,
        border: false,
        onSelect: function (date) {
          var target = this.target;
          var opts = $(target).datebox('options');
          opts.onSelect.call(target, date);
          setValue(target, opts.formatter.call(target, date));
          $(target).combo('hidePanel');
        }
      });
    }

    $(target).combo('textbox').parent().addClass('datebox');
    $(target).datebox('initValue', opts.value);

    function bindEvents(target) {
      var opts = $(target).datebox('options');
      var panel = $(target).combo('panel');
      panel.unbind('.datebox').bind('click.datebox', function (e) {
        if ($(e.target).hasClass('datebox-button-a')) {
          var index = parseInt($(e.target).attr('datebox-button-index'));
          opts.buttons[index].handler.call(e.target, target);
        }
      });
    }

    function setButtons(target) {
      var panel = $(target).combo('panel');
      if (panel.children('div.datebox-button').length) {return;}

      var $button = $('<div class="datebox-button"></div>').appendTo(panel);
      for (var i = 0; i < opts.buttons.length; i++) {
        var btn = opts.buttons[i];
        var $t = $('<a class="datebox-button-a" href="javascript:;"></a>').html($.isFunction(btn.text) ? btn.text(target) : btn.text).appendTo($button);
        $t.attr('datebox-button-index', i);
      }
    }

    function setCalendar(target) {
      var panel = $(target).combo('panel');
      var cc = panel.children('div.datebox-calendar-inner');
      panel.children()._outerWidth(panel.width());
      state.calendar.appendTo(cc);
      state.calendar[0].target = target;
      if (opts.panelHeight !== 'auto') {
        var height = panel.height();
        panel.children().not(cc).each(function () {
          height -= $(this).outerHeight();
        });
        cc._outerHeight(height);
      }
      state.calendar.calendar('resize');
    }
  }

  /**
   * called when user inputs some value in text box
   */
  function doQuery(target, q) {
    setValue(target, q, true);
  }

  /**
   * called when user press enter key
   */
  function doEnter(target) {
    var state = $.data(target, 'datebox');
    var opts = state.options;
    var current = state.calendar.calendar('options').current;
    if (current) {
      setValue(target, opts.formatter.call(target, current));
      $(target).combo('hidePanel');
    }
  }

  function setValue(target, value, remainText) {
    var state = $.data(target, 'datebox');
    var opts = state.options;
    var calendar = state.calendar;
    calendar.calendar('moveTo', opts.parser.call(target, value));
    if (remainText) {
      $(target).combo('setValue', value);
    } else {
      if (value) {
        value = opts.formatter.call(target, calendar.calendar('options').current);
      }
      $(target).combo('setText', value).combo('setValue', value);
    }
  }

  $.fn.datebox = function (options, param) {
    if (typeof options == 'string') {
      var method = $.fn.datebox.methods[options];
      if (method) {
        return method(this, param);
      } else {
        return this.combo(options, param);
      }
    }

    options = options || {};
    return this.each(function () {
      var state = $.data(this, 'datebox');
      if (state) {
        $.extend(state.options, options);
      } else {
        $.data(this, 'datebox', {
          options: $.extend({}, $.fn.datebox.defaults, $.fn.datebox.parseOptions(this), options)
        });
      }
      createBox(this);
    });
  };

  $.fn.datebox.methods = {
    options: function (jq) {
      var copts = jq.combo('options');
      return $.extend($.data(jq[0], 'datebox').options, {
        width: copts.width,
        height: copts.height,
        originalValue: copts.originalValue,
        disabled: copts.disabled,
        readonly: copts.readonly
      });
    },
    cloneFrom: function (jq, from) {
      return jq.each(function () {
        $(this).combo('cloneFrom', from);
        $.data(this, 'datebox', {
          options: $.extend(true, {}, $(from).datebox('options')),
          calendar: $(from).datebox('calendar')
        });
        $(this).addClass('datebox-f');
      });
    },
    calendar: function (jq) {	// get the calendar object
      return $.data(jq[0], 'datebox').calendar;
    },
    initValue: function (jq, value) {
      return jq.each(function () {
        var opts = $(this).datebox('options');
        var value = opts.value;
        if (value) {
          value = opts.formatter.call(this, opts.parser.call(this, value));
        }
        $(this).combo('initValue', value).combo('setText', value);
      });
    },
    setValue: function (jq, value) {
      return jq.each(function () {
        setValue(this, value);
      });
    },
    reset: function (jq) {
      return jq.each(function () {
        var opts = $(this).datebox('options');
        $(this).datebox('setValue', opts.originalValue);
      });
    }
  };

  $.fn.datebox.parseOptions = function (target) {
    return $.extend({}, $.fn.combo.parseOptions(target), $.parser.parseOptions(target, ['sharedCalendar']));
  };

  $.fn.datebox.defaults = $.extend({}, $.fn.combo.defaults, {
    panelWidth: 250,
    panelHeight: 'auto',
    sharedCalendar: null,

    keyHandler: {
      up: function (e) {},
      down: function (e) {},
      left: function (e) {},
      right: function (e) {},
      enter: function (e) {doEnter(this);},
      query: function (q, e) {doQuery(this, q);}
    },

    currentText: 'Today',
    closeText: 'Close',
    clearText: '清空',
    okText: 'Ok',

    buttons: [{
      text: function (target) {return $(target).datebox('options').currentText;},
      handler: function (target) {
        var opts = $(target).datebox('options');
        var now = new Date();
        var current = new Date(now.getFullYear(), now.getMonth(), now.getDate());
        $(target).datebox('calendar').calendar({
          year: current.getFullYear(),
          month: current.getMonth() + 1,
          current: current
        });
        opts.onSelect.call(target, current);
        doEnter(target);
      }
    }, {
      text: function (target) {return $(target).datebox('options').clearText;},
      handler: function (target) {
        $(target).datebox('clear');
        $(this).closest('div.combo-panel').panel('close');
      }
    }, {
      text: function (target) {return $(target).datebox('options').closeText;},
      handler: function (target) {
        $(this).closest('div.combo-panel').panel('close');
      }
    }],

    formatter: function (date) {
      var y = date.getFullYear();
      var m = date.getMonth() + 1;
      var d = date.getDate();
      return (m < 10 ? ('0' + m) : m) + '/' + (d < 10 ? ('0' + d) : d) + '/' + y;
    },
    parser: function (s) {
      if (!s) return new Date();
      var ss = s.split('/');
      var m = parseInt(ss[0], 10);
      var d = parseInt(ss[1], 10);
      var y = parseInt(ss[2], 10);
      if (!isNaN(y) && !isNaN(m) && !isNaN(d)) {
        return new Date(y, m - 1, d);
      } else {
        return new Date();
      }
    },

    onSelect: function (date) {}
  });
})(jQuery);