/**
 *  Slider.js
 *
 *  Created by Julia Radzhabova on 2/18/14
 *  Copyright (c) 2014 Ascensio System SIA. All rights reserved.
 *
 */

/**
 *  Example usage:
 *      new Common.UI.SingleSlider({
 *          el: $('#id'),
 *          minValue    : 0,
 *          maxValue    : 100,
 *          value       : 100
 *      });
 *
 *
 *  @property {Boolean} enableKeyEvents
 *  If true slider increase/decrease its value by {@link #step} when arrow key Up/Down or Right/Left is pressed.
 *
 *  enableKeyEvents: false,
 *
 *
 *
 *  Example usage:
 *      new Common.UI.MultiSlider({
 *          el: $('#id'),
 *          minValue    : 0,
 *          maxValue    : 100,
 *          values      : [0, 100]
 *      });
 *
 */

if (Common === undefined)
    var Common = {};

define([
    'common/main/lib/component/BaseView',
    'underscore'
], function (base, _) {
    'use strict';

    Common.UI.SingleSlider = Common.UI.BaseView.extend({

        options : {
            width: 100,
            minValue: 0,
            maxValue: 100,
            step: 1,
            value: 100,
            enableKeyEvents: false
        },

        disabled: false,

        template    : _.template([
            '<div class="slider single-slider" style="">',
                '<div class="track">',
                    '<div class="track-left img-commonctrl"></div>',
                    '<div class="track-center img-commonctrl"></div>',
                    '<div class="track-right img-commonctrl" style=""></div>',
                '</div>',
                '<div class="thumb img-commonctrl" style=""></div>',
                '<% if (this.options.enableKeyEvents) { %>',
                '<input type="text" style="position: absolute; top:-10px; width: 1px; height: 1px;">',
                '<% } %>',
            '</div>'
        ].join('')),

        initialize : function(options) {
            Common.UI.BaseView.prototype.initialize.call(this, options);

            var me = this,
                el = $(this.el);

            me.width = me.options.width;
            me.minValue = me.options.minValue;
            me.maxValue = me.options.maxValue;
            me.delta = 100/(me.maxValue - me.minValue);
            me.step = me.options.step;

            if (me.options.el) {
                me.render();
            }

            this.setValue(me.options.value);
        },

        render : function(parentEl) {
            var me = this;

            if (!me.rendered) {
                this.cmpEl = $(this.template({
                }));

                if (parentEl) {
                    this.setElement(parentEl, false);
                    parentEl.html(this.cmpEl);
                } else {
                    $(this.el).html(this.cmpEl);
                }
            } else {
                this.cmpEl = $(this.el);
            }

            this.cmpEl.find('.track-center').width(me.options.width - 14);
            this.cmpEl.width(me.options.width);

            this.thumb = this.cmpEl.find('.thumb');

            var onMouseUp = function (e) {
                e.preventDefault();
                e.stopPropagation();

                var pos = Math.max(0, Math.min(100, (Math.round((e.pageX - me.cmpEl.offset().left - me._dragstart) / me.width * 100))));
                me.setThumbPosition(pos);

                me.lastValue = me.value;
                me.value = pos/me.delta + me.minValue;

                me.thumb.removeClass('active');
                $(document).off('mouseup',   onMouseUp);
                $(document).off('mousemove', onMouseMove);

                me._dragstart = undefined;
                me.trigger('changecomplete', me, me.value, me.lastValue);
            };

            var onMouseMove = function (e) {
                if ( me.disabled ) return;
                if ( me._dragstart===undefined ) return;

                e.preventDefault();
                e.stopPropagation();

                var pos = Math.max(0, Math.min(100, (Math.round((e.pageX - me.cmpEl.offset().left - me._dragstart) / me.width * 100))));
                me.setThumbPosition(pos);

                me.lastValue = me.value;
                me.value = pos/me.delta + me.minValue;

                if (Math.abs(me.value-me.lastValue)>0.001)
                    me.trigger('change', me, me.value, me.lastValue);
            };

            var onMouseDown = function (e) {
                if ( me.disabled ) return;
                me._dragstart = e.pageX - me.thumb.offset().left - 7;

                me.thumb.addClass('active');
                $(document).on('mouseup',   onMouseUp);
                $(document).on('mousemove', onMouseMove);

                if (me.options.enableKeyEvents)
                    setTimeout(function() {me.input.focus();}, 10);
            };

            var onTrackMouseDown = function (e) {
                if ( me.disabled ) return;

                var pos = Math.max(0, Math.min(100, (Math.round((e.pageX - me.cmpEl.offset().left) / me.width * 100))));
                me.setThumbPosition(pos);

                me.lastValue = me.value;
                me.value = pos/me.delta + me.minValue;

                me.trigger('change', me, me.value, me.lastValue);
                me.trigger('changecomplete', me, me.value, me.lastValue);
            };

            var updateslider;

            var moveThumb = function(increase) {
                me.lastValue = me.value;
                me.value = Math.max(me.minValue, Math.min(me.maxValue, me.value + ((increase) ? me.step : -me.step)));
                me.setThumbPosition(Math.round((me.value-me.minValue)*me.delta));
                me.trigger('change', me, me.value, me.lastValue);
            };

            var onKeyDown = function (e) {
                if ( me.disabled ) return;

                if (e.keyCode==Common.UI.Keys.UP || e.keyCode==Common.UI.Keys.DOWN || e.keyCode==Common.UI.Keys.LEFT || e.keyCode==Common.UI.Keys.RIGHT) {
                    e.preventDefault();
                    e.stopPropagation();
                    el.off('keydown', 'input', onKeyDown);
                    updateslider = setInterval(_.bind(moveThumb, me, e.keyCode==Common.UI.Keys.UP || e.keyCode==Common.UI.Keys.RIGHT), 100);
                }
            };

            var onKeyUp = function (e) {
                if ( me.disabled ) return;

                if (e.keyCode==Common.UI.Keys.UP || e.keyCode==Common.UI.Keys.DOWN || Common.UI.Keys.LEFT || Common.UI.Keys.RIGHT) {
                    e.stopPropagation();
                    e.preventDefault();
                    clearInterval(updateslider);
                    moveThumb(e.keyCode==Common.UI.Keys.UP || e.keyCode==Common.UI.Keys.RIGHT);
                    el.on('keydown', 'input', onKeyDown);
                    me.trigger('changecomplete', me, me.value, me.lastValue);
                }
            };

            if (!me.rendered) {
                var el = me.cmpEl;
                el.on('mousedown', '.thumb', onMouseDown);
                el.on('mousedown', '.track', onTrackMouseDown);
                if (this.options.enableKeyEvents) {
                    el.on('keydown', 'input', onKeyDown);
                    el.on('keyup',   'input', onKeyUp);
                }
            }

            me.rendered = true;

            return this;
        },

        setThumbPosition: function(x) {
            this.thumb.css({left: x + '%'});
        },

        setValue: function(value) {
            this.lastValue = this.value;
            this.value = Math.max(this.minValue, Math.min(this.maxValue, value));
            this.setThumbPosition(Math.round((value-this.minValue)*this.delta));
        },

        getValue: function() {
            return this.value;
        },

        setDisabled: function(disabled) {
            if (disabled !== this.disabled)
                this.cmpEl.toggleClass('disabled', disabled);
            this.disabled = disabled;
        }
    });

    Common.UI.MultiSlider = Common.UI.BaseView.extend({

        options : {
            width: 100,
            minValue: 0,
            maxValue: 100,
            values: [0, 100]
        },

        disabled: false,

        template    : _.template([
            '<div class="slider multi-slider">',
                '<div class="track">',
                    '<div class="track-left"></div>',
                    '<div class="track-center""></div>',
                    '<div class="track-right" style=""></div>',
                '</div>',
                '<% _.each(items, function(item) { %>',
                '<div class="thumb" style=""></div>',
                '<% }); %>',
            '</div>'
        ].join('')),

        initialize : function(options) {
            Common.UI.BaseView.prototype.initialize.call(this, options);

            var me = this,
                el = $(this.el);

            me.width = me.options.width;
            me.minValue = me.options.minValue;
            me.maxValue = me.options.maxValue;
            me.delta = 100/(me.maxValue - me.minValue);
            me.thumbs = [];

            if (me.options.el) {
                me.render();
            }
        },

        render : function(parentEl) {
            var me = this;

            if (!me.rendered) {
                this.cmpEl = $(this.template({
                    items: this.options.values
                }));

                if (parentEl) {
                    this.setElement(parentEl, false);
                    parentEl.html(this.cmpEl);
                } else {
                    $(this.el).html(this.cmpEl);
                }
            } else {
                this.cmpEl = $(this.el);
            }

            var el = this.cmpEl;
            el.find('.track-center').width(me.options.width - 14);
            el.width(me.options.width);

            var onMouseUp = function (e) {
                e.preventDefault();
                e.stopPropagation();

                var index = e.data,
                    lastValue = me.thumbs[index].value,
                    minValue = (index-1<0) ? 0 : me.thumbs[index-1].position,
                    maxValue = (index+1<me.thumbs.length) ? me.thumbs[index+1].position : 100,
                    pos = Math.max(minValue, Math.min(maxValue, (Math.round((e.pageX - me.cmpEl.offset().left - me._dragstart) / me.width * 100)))),
                    value = pos/me.delta + me.minValue;

                me.setThumbPosition(index, pos);
                me.thumbs[index].value = value;

                $(document).off('mouseup', onMouseUp);
                $(document).off('mousemove', onMouseMove);

                me._dragstart = undefined;
                me.trigger('changecomplete', me, value, lastValue);
            };

            var onMouseMove = function (e) {
                if ( me.disabled ) return;
                if ( me._dragstart===undefined ) return;

                e.preventDefault();
                e.stopPropagation();

                var index = e.data,
                    lastValue = me.thumbs[index].value,
                    minValue = (index-1<0) ? 0 : me.thumbs[index-1].position,
                    maxValue = (index+1<me.thumbs.length) ? me.thumbs[index+1].position : 100,
                    pos = Math.max(minValue, Math.min(maxValue, (Math.round((e.pageX - me.cmpEl.offset().left - me._dragstart) / me.width * 100)))),
                    value = pos/me.delta + me.minValue;

                me.setThumbPosition(index, pos);
                me.thumbs[index].value = value;

                if (Math.abs(value-lastValue)>0.001)
                    me.trigger('change', me, value, lastValue);
            };

            var onMouseDown = function (e) {
                if ( me.disabled ) return;

                var index = e.data,
                    thumb = me.thumbs[index].thumb;

                me._dragstart = e.pageX - thumb.offset().left - thumb.width()/2;
                me.setActiveThumb(index);

                _.each(me.thumbs, function (item, idx) {
                    (index == idx) ? item.thumb.css('z-index', 500) : item.thumb.css('z-index', '');
                });

                $(document).on('mouseup', null, index, onMouseUp);
                $(document).on('mousemove', null, index, onMouseMove);
            };

            var onTrackMouseDown = function (e) {
                if ( me.disabled ) return;

                var pos = Math.max(0, Math.min(100, (Math.round((e.pageX - me.cmpEl.offset().left) / me.width * 100)))),
                    index = findThumb(pos),
                    lastValue = me.thumbs[index].value,
                    value = pos/me.delta + me.minValue;

                me.setThumbPosition(index, pos);
                me.thumbs[index].value = value;

                me.trigger('change', me, value, lastValue);
                me.trigger('changecomplete', me, value, lastValue);
            };

            var findThumb = function(pos) {
                var nearest = 100,
                    index = 0,
                    len = me.thumbs.length,
                    dist;

                for (var i=0; i<len; i++) {
                    dist = Math.abs(me.thumbs[i].position - pos);
                    if (Math.abs(dist <= nearest)) {
                        var above = me.thumbs[i + 1];
                        var below = me.thumbs[i - 1];

                        if (below !== undefined && pos < below.position) {
                            continue;
                        }
                        if (above !== undefined && pos > above.position) {
                            continue;
                        }
                        index = i;
                        nearest = dist;
                    }
                }
                return index;
            };

            this.$thumbs = el.find('.thumb');
            _.each(this.$thumbs, function(item, index) {
                var thumb = $(item);
                me.thumbs.push({
                    thumb: thumb,
                    index: index
                });
                me.setValue(index, me.options.values[index]);
                thumb.on('mousedown', null, index, onMouseDown);
            });
            me.setActiveThumb(0, true);

            if (!me.rendered) {
                el.on('mousedown', '.track', onTrackMouseDown);
            }

            me.rendered = true;

            return this;
        },

        setActiveThumb: function(index, suspend) {
            this.currentThumb = index;
            this.$thumbs.removeClass('active');
            this.thumbs[index].thumb.addClass('active');
            if (suspend!==true) this.trigger('thumbclick', this, index);
        },

        setThumbPosition: function(index, x) {
            this.thumbs[index].position = x;
            this.thumbs[index].thumb.css({left: x + '%'});
        },

        setValue: function(index, value) {
            this.thumbs[index].value = Math.max(this.minValue, Math.min(this.maxValue, value));
            this.setThumbPosition(index, Math.round((value-this.minValue)*this.delta));
        },


        getValue: function(index) {
            return this.thumbs[index].value;
        },

        getValues: function() {
            var values = [];
            _.each (this.thumbs, function(thumb) {
                values.push(thumb.value);
            });

            return values;
        },

        setDisabled: function(disabled) {
            if (disabled !== this.disabled)
                this.cmpEl.toggleClass('disabled', disabled);
            this.disabled = disabled;
        }
    });
});