angular.module('ui.bootstrap.timepicker', [])

.constant('timepickerConfig', {
  hourStep: 1,
  minuteStep: 1,
  showMeridian: true,
  meridians: null,
  readonlyInput: false,
  mousewheel: true,
  arrowkeys: true,
  showSpinners: true
})

.controller('TimepickerController', ['$scope', '$attrs', '$parse', '$log', '$locale', 'timepickerConfig', function($scope, $attrs, $parse, $log, $locale, timepickerConfig) {
  var selected = new Date(),
      ngModelCtrl = { $setViewValue: angular.noop }, // nullModelCtrl
      meridians = angular.isDefined($attrs.meridians) ? $scope.$parent.$eval($attrs.meridians) : timepickerConfig.meridians || $locale.DATETIME_FORMATS.AMPMS;

  this.init = function(ngModelCtrl_, inputs) {
    ngModelCtrl = ngModelCtrl_;
    ngModelCtrl.$render = this.render;

    ngModelCtrl.$formatters.unshift(function(modelValue) {
      return modelValue ? new Date(modelValue) : null;
    });

    var hoursInputEl = inputs.eq(0),
        minutesInputEl = inputs.eq(1);

    var mousewheel = angular.isDefined($attrs.mousewheel) ? $scope.$parent.$eval($attrs.mousewheel) : timepickerConfig.mousewheel;
    if (mousewheel) {
      this.setupMousewheelEvents(hoursInputEl, minutesInputEl);
    }

    var arrowkeys = angular.isDefined($attrs.arrowkeys) ? $scope.$parent.$eval($attrs.arrowkeys) : timepickerConfig.arrowkeys;
    if (arrowkeys) {
      this.setupArrowkeyEvents(hoursInputEl, minutesInputEl);
    }

    $scope.readonlyInput = angular.isDefined($attrs.readonlyInput) ? $scope.$parent.$eval($attrs.readonlyInput) : timepickerConfig.readonlyInput;
    this.setupInputEvents(hoursInputEl, minutesInputEl);
  };

  var hourStep = timepickerConfig.hourStep;
  if ($attrs.hourStep) {
    $scope.$parent.$watch($parse($attrs.hourStep), function(value) {
      hourStep = parseInt(value, 10);
    });
  }

  var minuteStep = timepickerConfig.minuteStep;
  if ($attrs.minuteStep) {
    $scope.$parent.$watch($parse($attrs.minuteStep), function(value) {
      minuteStep = parseInt(value, 10);
    });
  }

  var min;
  $scope.$parent.$watch($parse($attrs.min), function(value) {
    var dt = new Date(value);
    min = isNaN(dt) ? undefined : dt;
  });

  var max;
  $scope.$parent.$watch($parse($attrs.max), function(value) {
    var dt = new Date(value);
    max = isNaN(dt) ? undefined : dt;
  });

  $scope.noIncrementHours = function() {
    var incrementedSelected = addMinutes(selected, hourStep * 60);
    return incrementedSelected > max ||
      (incrementedSelected < selected && incrementedSelected < min);
  };

  $scope.noDecrementHours = function() {
    var decrementedSelected = addMinutes(selected, -hourStep * 60);
    return decrementedSelected < min ||
      (decrementedSelected > selected && decrementedSelected > max);
  };

  $scope.noIncrementMinutes = function() {
    var incrementedSelected = addMinutes(selected, minuteStep);
    return incrementedSelected > max ||
      (incrementedSelected < selected && incrementedSelected < min);
  };

  $scope.noDecrementMinutes = function() {
    var decrementedSelected = addMinutes(selected, -minuteStep);
    return decrementedSelected < min ||
      (decrementedSelected > selected && decrementedSelected > max);
  };

  $scope.noToggleMeridian = function() {
    if (selected.getHours() < 13) {
      return addMinutes(selected, 12 * 60) > max;
    } else {
      return addMinutes(selected, -12 * 60) < min;
    }
  };

  // 12H / 24H mode
  $scope.showMeridian = timepickerConfig.showMeridian;
  if ($attrs.showMeridian) {
    $scope.$parent.$watch($parse($attrs.showMeridian), function(value) {
      $scope.showMeridian = !!value;

      if (ngModelCtrl.$error.time) {
        // Evaluate from template
        var hours = getHoursFromTemplate(), minutes = getMinutesFromTemplate();
        if (angular.isDefined(hours) && angular.isDefined(minutes)) {
          selected.setHours(hours);
          refresh();
        }
      } else {
        updateTemplate();
      }
    });
  }

  // Get $scope.hours in 24H mode if valid
  function getHoursFromTemplate() {
    var hours = parseInt($scope.hours, 10);
    var valid = $scope.showMeridian ? (hours > 0 && hours < 13) : (hours >= 0 && hours < 24);
    if (!valid) {
      return undefined;
    }

    if ($scope.showMeridian) {
      if (hours === 12) {
        hours = 0;
      }
      if ($scope.meridian === meridians[1]) {
        hours = hours + 12;
      }
    }
    return hours;
  }

  function getMinutesFromTemplate() {
    var minutes = parseInt($scope.minutes, 10);
    return (minutes >= 0 && minutes < 60) ? minutes : undefined;
  }

  function pad(value) {
    return (angular.isDefined(value) && value.toString().length < 2) ? '0' + value : value.toString();
  }

  // Respond on mousewheel spin
  this.setupMousewheelEvents = function(hoursInputEl, minutesInputEl) {
    var isScrollingUp = function(e) {
      if (e.originalEvent) {
        e = e.originalEvent;
      }
      //pick correct delta variable depending on event
      var delta = (e.wheelDelta) ? e.wheelDelta : -e.deltaY;
      return (e.detail || delta > 0);
    };

    hoursInputEl.bind('mousewheel wheel', function(e) {
      $scope.$apply(isScrollingUp(e) ? $scope.incrementHours() : $scope.decrementHours());
      e.preventDefault();
    });

    minutesInputEl.bind('mousewheel wheel', function(e) {
      $scope.$apply(isScrollingUp(e) ? $scope.incrementMinutes() : $scope.decrementMinutes());
      e.preventDefault();
    });

  };

  // Respond on up/down arrowkeys
  this.setupArrowkeyEvents = function(hoursInputEl, minutesInputEl) {
    hoursInputEl.bind('keydown', function(e) {
      if (e.which === 38) { // up
        e.preventDefault();
        $scope.incrementHours();
        $scope.$apply();
      } else if (e.which === 40) { // down
        e.preventDefault();
        $scope.decrementHours();
        $scope.$apply();
      }
    });

    minutesInputEl.bind('keydown', function(e) {
      if (e.which === 38) { // up
        e.preventDefault();
        $scope.incrementMinutes();
        $scope.$apply();
      } else if (e.which === 40) { // down
        e.preventDefault();
        $scope.decrementMinutes();
        $scope.$apply();
      }
    });
  };

  this.setupInputEvents = function(hoursInputEl, minutesInputEl) {
    if ($scope.readonlyInput) {
      $scope.updateHours = angular.noop;
      $scope.updateMinutes = angular.noop;
      return;
    }

    var invalidate = function(invalidHours, invalidMinutes) {
      ngModelCtrl.$setViewValue(null);
      ngModelCtrl.$setValidity('time', false);
      if (angular.isDefined(invalidHours)) {
        $scope.invalidHours = invalidHours;
      }
      if (angular.isDefined(invalidMinutes)) {
        $scope.invalidMinutes = invalidMinutes;
      }
    };

    $scope.updateHours = function() {
      var hours = getHoursFromTemplate(),
        minutes = getMinutesFromTemplate();

      if (angular.isDefined(hours) && angular.isDefined(minutes)) {
        selected.setHours(hours);
        if (selected < min || selected > max) {
          invalidate(true);
        } else {
          refresh('h');
        }
      } else {
        invalidate(true);
      }
    };

    hoursInputEl.bind('blur', function(e) {
      if (!$scope.invalidHours && $scope.hours < 10) {
        $scope.$apply(function() {
          $scope.hours = pad($scope.hours);
        });
      }
    });

    $scope.updateMinutes = function() {
      var minutes = getMinutesFromTemplate(),
        hours = getHoursFromTemplate();

      if (angular.isDefined(minutes) && angular.isDefined(hours)) {
        selected.setMinutes(minutes);
        if (selected < min || selected > max) {
          invalidate(undefined, true);
        } else {
          refresh('m');
        }
      } else {
        invalidate(undefined, true);
      }
    };

    minutesInputEl.bind('blur', function(e) {
      if (!$scope.invalidMinutes && $scope.minutes < 10) {
        $scope.$apply(function() {
          $scope.minutes = pad($scope.minutes);
        });
      }
    });

  };

  this.render = function() {
    var date = ngModelCtrl.$viewValue;

    if (isNaN(date)) {
      ngModelCtrl.$setValidity('time', false);
      $log.error('Timepicker directive: "ng-model" value must be a Date object, a number of milliseconds since 01.01.1970 or a string representing an RFC2822 or ISO 8601 date.');
    } else {
      if (date) {
        selected = date;
      }

      if (selected < min || selected > max) {
        ngModelCtrl.$setValidity('time', false);
        $scope.invalidHours = true;
        $scope.invalidMinutes = true;
      } else {
        makeValid();
      }
      updateTemplate();
    }
  };

  // Call internally when we know that model is valid.
  function refresh(keyboardChange) {
    makeValid();
    ngModelCtrl.$setViewValue(new Date(selected));
    updateTemplate(keyboardChange);
  }

  function makeValid() {
    ngModelCtrl.$setValidity('time', true);
    $scope.invalidHours = false;
    $scope.invalidMinutes = false;
  }

  function updateTemplate(keyboardChange) {
    var hours = selected.getHours(), minutes = selected.getMinutes();

    if ($scope.showMeridian) {
      hours = (hours === 0 || hours === 12) ? 12 : hours % 12; // Convert 24 to 12 hour system
    }

    $scope.hours = keyboardChange === 'h' ? hours : pad(hours);
    if (keyboardChange !== 'm') {
      $scope.minutes = pad(minutes);
    }
    $scope.meridian = selected.getHours() < 12 ? meridians[0] : meridians[1];
  }

  function addMinutes(date, minutes) {
    var dt = new Date(date.getTime() + minutes * 60000);
    var newDate = new Date(date);
    newDate.setHours(dt.getHours(), dt.getMinutes());
    return newDate;
  }

  function addMinutesToSelected(minutes) {
    selected = addMinutes(selected, minutes);
    refresh();
  }

  $scope.showSpinners = angular.isDefined($attrs.showSpinners) ?
    $scope.$parent.$eval($attrs.showSpinners) : timepickerConfig.showSpinners;

  $scope.incrementHours = function() {
    if (!$scope.noIncrementHours()) {
      addMinutesToSelected(hourStep * 60);
    }
  };

  $scope.decrementHours = function() {
    if (!$scope.noDecrementHours()) {
      addMinutesToSelected(-hourStep * 60);
    }
  };

  $scope.incrementMinutes = function() {
    if (!$scope.noIncrementMinutes()) {
      addMinutesToSelected(minuteStep);
    }
  };

  $scope.decrementMinutes = function() {
    if (!$scope.noDecrementMinutes()) {
      addMinutesToSelected(-minuteStep);
    }
  };

  $scope.toggleMeridian = function() {
    if (!$scope.noToggleMeridian()) {
      addMinutesToSelected(12 * 60 * (selected.getHours() < 12 ? 1 : -1));
    }
  };
}])

.directive('timepicker', function() {
  return {
    restrict: 'EA',
    require: ['timepicker', '?^ngModel'],
    controller:'TimepickerController',
    controllerAs: 'timepicker',
    replace: true,
    scope: {},
    templateUrl: function(element, attrs) {
      return attrs.templateUrl || 'template/timepicker/timepicker.html';
    },
    link: function(scope, element, attrs, ctrls) {
      var timepickerCtrl = ctrls[0], ngModelCtrl = ctrls[1];

      if (ngModelCtrl) {
        timepickerCtrl.init(ngModelCtrl, element.find('input'));
      }
    }
  };
});
