'use strict';

var Module = angular.module('datePicker', []);

Module.constant('datePickerConfig', {
  template: 'templates/datepicker.html',
  view: 'month',
  views: ['year', 'month', 'date', 'hours', 'minutes'],
  step: 5
});

function getVisibleMinutes(date, step) {
  date = new Date(date || new Date());
  date = new Date(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours());
  var minutes = [];
  var stop = date.getTime() + 60 * 60 * 1000;
  while (date.getTime() < stop) {
    minutes.push(date);
    date = new Date(date.getTime() + step * 60 * 1000);
  }
  return minutes;
}

function getVisibleWeeks(date) {
  date = new Date(date || new Date());
  date.setDate(1);
  date.setHours(0);
  date.setMinutes(0);
  date.setSeconds(0);
  date.setMilliseconds(0);

  if (date.getDay() === 0) {
    date.setDate(-5);
  } else {
    date.setDate(date.getDate() - (date.getDay() - 1));
  }
  if (date.getDate() === 1) {
    date.setDate(-6);
  }

  var weeks = [];
  while (weeks.length < 6) {
    var week = [];
    for (var i = 0; i < 7; i++) {
      week.push(new Date(date));
      date.setDate(date.getDate() + 1);
    }
    weeks.push(week);
  }
  return weeks;
}

function getVisibleYears(date) {
  var years = [];
  date = new Date(date || new Date());
  date.setFullYear(date.getFullYear() - (date.getFullYear() % 10));
  for (var i = 0; i < 12; i++) {
    years.push(new Date(date.getFullYear() + (i - 1), 0, 1));
  }
  return years;
}

function getDaysOfWeek(date) {
  date = new Date(date || new Date());
  date = new Date(date.getFullYear(), date.getMonth(), date.getDate());
  date.setDate(date.getDate() - (date.getDay() - 1));
  var days = [];
  for (var i = 0; i < 7; i++) {
    days.push(new Date(date));
    date.setDate(date.getDate() + 1);
  }
  return days;
}

function getVisibleMonths(date) {
  date = new Date(date || new Date());
  var year = date.getFullYear();
  var months = [];
  for (var month = 0; month < 12; month++) {
    months.push(new Date(year, month, 1));
  }
  return months;
}

function getVisibleHours(date) {
  date = new Date(date || new Date());
  date.setHours(0);
  date.setMinutes(0);
  date.setSeconds(0);
  date.setMilliseconds(0);
  var hours = [];
  for (var i = 0; i < 24; i++) {
    hours.push(date);
    date = new Date(date.getTime() + 60 * 60 * 1000);
  }
  return hours;
}

Module.directive('datePicker', function datePickerDirective(datePickerConfig) {

  //noinspection JSUnusedLocalSymbols
  return {
    // this is a bug ?
    template: '<div ng-include="template"></div>',
    scope: {
      model: '=datePicker',
      after: '=?',
      before: '=?'
    },
    link: function (scope, element, attrs) {

      scope.date = new Date(scope.model || new Date());
      scope.views = datePickerConfig.views.concat();
      scope.view = attrs.view || datePickerConfig.view;
      scope.now = new Date();
      scope.template = attrs.template || datePickerConfig.template;

      var step = parseInt(attrs.step || datePickerConfig.step, 10);
      var index;

      /** @namespace attrs.minView */
      if (attrs.minView) {
        index = scope.views.indexOf(attrs.minView);
        scope.views.splice(0, index);
      }
      /** @namespace attrs.maxView */
      if (attrs.maxView) {
        index = scope.views.indexOf(attrs.maxView);
        scope.views.splice(index + 1);
      }

      if (scope.views.length === 1) {
        scope.view = scope.views[0];
      }

      scope.setView = function (nextView) {
        if (scope.views.indexOf(nextView) !== -1) {
          scope.view = nextView;
        }
      };

      scope.setDate = function (date) {
        scope.date = date;
        // change next view
        var nextView = scope.views[scope.views.indexOf(scope.view) + 1];
        if (!nextView || scope.model) {

          scope.model = new Date(scope.model || date);

          //noinspection FallThroughInSwitchStatementJS
          switch (scope.view) {
          case 'minutes':
            scope.model.setMinutes(date.getMinutes());
          /*falls through*/
          case 'hours':
            scope.model.setHours(date.getHours());
          /*falls through*/
          case 'date':
            scope.model.setDate(date.getDate());
          /*falls through*/
          case 'month':
            scope.model.setMonth(date.getMonth());
          /*falls through*/
          case 'year':
            scope.model.setFullYear(date.getFullYear());
          }
          scope.$emit('setDate', scope.model, scope.view);
        }

        if (nextView) {
          scope.setView(nextView);
        }
      };

      function update() {
        var view = scope.view;
        var date = scope.date;
        switch (view) {
        case 'year':
          scope.years = getVisibleYears(date);
          break;
        case 'month':
          scope.months = getVisibleMonths(date);
          break;
        case 'date':
          scope.weekdays = scope.weekdays || getDaysOfWeek();
          scope.weeks = getVisibleWeeks(date);
          break;
        case 'hours':
          scope.hours = getVisibleHours(date);
          break;
        case 'minutes':
          scope.minutes = getVisibleMinutes(date, step);
          break;
        }
      }

      function watch() {
        if (scope.view !== 'date') {
          return scope.view;
        }
        return scope.model ? scope.model.getMonth() : null;
      }


      scope.$watch(watch, update);

      scope.next = function (delta) {
        var date = scope.date;
        delta = delta || 1;
        switch (scope.view) {
        case 'year':
        /*falls through*/
        case 'month':
          date.setFullYear(date.getFullYear() + delta);
          break;
        case 'date':
          date.setMonth(date.getMonth() + delta);
          break;
        case 'hours':
        /*falls through*/
        case 'minutes':
          date.setHours(date.getHours() + delta);
          break;
        }
        update();
      };

      scope.prev = function (delta) {
        return scope.next(-delta || -1);
      };

      scope.isAfter = function (date) {
        return scope.after ? scope.after.getTime() <= date.getTime() : false;
      };

      scope.isBefore = function (date) {
        return scope.before ? scope.before.getTime() >= date.getTime() : false;
      };

      scope.isSameMonth = function (date) {
        return scope.isSameYear(date) && scope.model.getMonth() === date.getMonth();
      };

      scope.isSameYear = function (date) {
        return (scope.model ? scope.model.getFullYear() === date.getFullYear() : false);
      };

      scope.isSameDay = function (date) {
        return scope.isSameMonth(date) && scope.model.getDate() === date.getDate();
      };

      scope.isSameHour = function (date) {
        return scope.isSameDay(date) && scope.model.getHours() === date.getHours();
      };

      scope.isSameMinutes = function (date) {
        return scope.isSameHour(date) && scope.model.getMinutes() === date.getMinutes();
      };

      scope.isNow = function (date) {
        var is = true;
        var now = scope.now;
        //noinspection FallThroughInSwitchStatementJS
        switch (scope.view) {
        case 'minutes':
          is &= ~~(date.getMinutes()/step) === ~~(now.getMinutes()/step);
        /*falls through*/
        case 'hours':
          is &= date.getHours() === now.getHours();
        /*falls through*/
        case 'date':
          is &= date.getDate() === now.getDate();
        /*falls through*/
        case 'month':
          is &= date.getMonth() === now.getMonth();
        /*falls through*/
        case 'year':
          is &= date.getFullYear() === now.getFullYear();
        }
        return is;
      };
    }
  };
});
