/**
 * ReMooz - Zoomer
 *
 * Inspired by so many boxes and zooms
 *
 * @version   1.0
 *
 * @license   MIT-style license
 * @author    Harald Kirschner <mail [at] digitarald.de>
 * @copyright Author
 */

var ReMooz = {

  Implements: [Events, Options, Chain],

  options: {
    link: null,
    type: 'image',
    container: null,
    className: null,
    centered: false,
    dragging: true,
    closeOnClick: true,
    shadow: (Browser.Engine.trident) ? 'onOpenEnd' : 'onOpen', // performance
    resize: true,
    margin: 20,
    resizeFactor: 0.95,
    resizeLimit: false, // {x: 640, y: 640}
    fixedSize: false,
    cutOut: true,
    addClick: true,
    opacityLoad: 0.6,
    opacityResize: 1,
    opacityTitle: 0.9,
    resizeOptions: {},
    fxOptions: {},
    closer: true,
    parse: false, // 'rel'
    parseSecure: false,
    temporary: false,
    onBuild: $empty,
    onLoad: $empty,
    onOpen: $empty,
    onOpenEnd: $empty,
    onClose: $empty,
    onCloseEnd: $empty,
    generateTitle: function(el) {
      var text = el.get('title');
      if (!text) return false;
      var title = text.split(' :: ');
      var head = new Element('h6', {'html': title[0]});
      return (title[1]) ? [head, new Element('p', {'html': title[1]})] : head;
    }
  },

  initialize: function(element, options) {
    this.element = $(element);
    this.setOptions(options);
    if (this.options.parse) {
      var obj = this.element.getProperty(this.options.parse);
      if (obj && (obj = JSON.decode(obj, this.options.parseSecure))) this.setOptions(obj);
    }
    var origin = this.options.origin;
    this.origin = ((origin) ? $(origin) || this.element.getElement(origin) : null) || this.element;
    this.link = this.options.link || this.element.get('href') || this.element.get('src');
    this.container = $(this.options.container) || this.element.getDocument();
    this.bound = {
      'click': function(e) {
        this.open.delay(1, this);
        return false;
      }.bind(this),
      'close': this.close.bind(this),
      'dragClose': function(e) {
        if (e.rightClick) return;
        this.close();
      }.bind(this)
    };
    if (this.options.addClick) this.bindToElement();
  },

  destroy: function() {
    if (this.box) this.box.destroy();
    this.box = this.tweens = this.body = this.content = null;
  },

  bindToElement: function(element) {
    ($(element) || this.element).addClass('remooz-element').addEvent('click', this.bound.click);
    return this;
  },

  getOriginCoordinates: function() {
    var coords = this.origin.getCoordinates();
    delete coords.right;
    delete coords.bottom;
    return coords;
  },

  open: function(e) {
    if (this.opened) return (e) ? this.close() : this;
    this.opened = this.loading = true;
    if (!this.box) this.build();
    this.coords = this.getOriginCoordinates();
    this.coords.opacity = this.options.opacityLoad;
    this.coords.display = '';
    this.tweens.box.set(this.coords);
    this.box.addClass('remooz-loading');
    ReMooz.open(this.fireEvent('onLoad'));
    this['open' + this.options.type.capitalize()]();
    return this;
  },

  finishOpen: function() {
    this.tweens.fade.start(0, 1);
    this.drag.attach();
    this.fireEvent('onOpenEnd').callChain();
  },

  close: function() {
    if (!this.opened) return this;
    this.opened = false;
    ReMooz.close(this.fireEvent('onClose'));
    if (this.loading) {
      this.box.setStyle('display', 'none');
      return this;
    }
    this.drag.detach();
    this.tweens.fade.cancel().set(0).fireEvent('onComplete');
    if (this.tweens.box.timer) this.tweens.box.clearChain();
    var vars = this.getOriginCoordinates();
    if (this.options.opacityResize != 1) vars.opacity = this.options.opacityResize;
    this.tweens.box.start(vars).chain(this.closeEnd.bind(this));
    return this;
  },

  closeEnd: function() {
    if (this.options.cutOut) this.element.setStyle('visibility', 'visible');
    this.box.setStyle('display', 'none');
    this.fireEvent('onCloseEnd').callChain();
    if (this.options.temporary) this.destroy();
  },

  openImage: function() {
    var tmp = new Image();
    tmp.onload = tmp.onabort = tmp.onerror = function(fast) {
      this.loading = tmp.onload = tmp.onabort = tmp.onerror = null;
      if (!tmp.width || !this.opened) {
        this.fireEvent('onError').close();
        return;
      }
      var to = {x: tmp.width, y: tmp.height};
      if (!this.content) this.content = $(tmp).inject(this.body);
      else tmp = null;
      this[(this.options.resize) ? 'zoomRelativeTo' : 'zoomTo'].create({
        'delay': (tmp && fast !== true) ? 1 : null,
        'arguments': [to],
        'bind': this
      })();
    }.bind(this);
    tmp.src = this.link;
    if (tmp && tmp.complete && tmp.onload) tmp.onload(true);
  },

  /**
   * @todo Test implementation
   */
  openElement: function() {
    this.content = this.content || $(this.link) || $E(this.link);
    if (!this.content) {
      this.fireEvent('onError').close();
      return;
    }
    this.content.inject(this.body);
    this.zoomTo({x: this.content.scrollWidth, y: this.content.scrollHeight});
  },

  zoomRelativeTo: function(to) {
    var scale = this.options.resizeLimit;
    if (!scale) {
      scale = this.container.getSize();
      scale.x *= this.options.resizeFactor;
      scale.y *= this.options.resizeFactor;
    }
    for (var i = 2; i--;) {
      if (to.x > scale.x) {
        to.y *= scale.x / to.x;
        to.x = scale.x;
      } else if (to.y > scale.y) {
        to.x *= scale.y / to.y;
        to.y = scale.y;
      }
    }
    return this.zoomTo({x: to.x.toInt(), y: to.y.toInt()});
  },

  zoomTo: function(to) {
    to = this.options.fixedSize || to;
    var box = this.container.getSize(), scroll = this.container.getScroll();
    var pos = (!this.options.centered) ? {
      x: (this.coords.left + (this.coords.width / 2) - to.x / 2).toInt()
        .limit(scroll.x + this.options.margin, scroll.x + box.x - this.options.margin - to.x),
      y: (this.coords.top + (this.coords.height / 2) - to.y / 2).toInt()
        .limit(scroll.y + this.options.margin, scroll.y + box.y - this.options.margin - to.y)
    } :  {
      x: scroll.x + ((box.x - to.x) / 2).toInt(),
      y: scroll.y + ((box.y - to.y) / 2).toInt()
    };
    if (this.options.cutOut) this.element.setStyle('visibility', 'hidden');
    this.box.removeClass('remooz-loading');
    var vars = {left: pos.x, top: pos.y, width: to.x, height: to.y};
    if (this.options.opacityResize != 1) vars.opacity = [this.options.opacityResize, 1];
    else this.box.set('opacity', 1);
    this.tweens.box.start(vars).chain(this.finishOpen.bind(this));
    this.fireEvent('onOpen');
  },

  build: function() {
    this.addEvent('onBlur', function() {
      this.focused = false;
      this.box.removeClass('remooz-box-focus').setStyle('z-index', ReMooz.options.zIndex);
    }, true);
    this.addEvent('onFocus', function() {
      this.focused = true;
      this.box.addClass('remooz-box-focus').setStyle('z-index', ReMooz.options.zIndexFocus);
    }, true);

    var classes = ['remooz-box', 'remooz-type-' + this.options.type, 'remooz-engine-' + Browser.Engine.name + Browser.Engine.version];
    if (this.options.className) classes.push(this.options.className);
    this.box = new Element('div', {
      'class': classes.join(' '),
      'styles': {
        'display': 'none',
        'top': 0,
        'left': 0,
        'zIndex': ReMooz.options.zIndex
      }
    });

    this.tweens = {
      'box': new Fx.Morph(this.box, $merge({
          'duration': 400,
          'unit': 'px',
          'transition': Fx.Transitions.Quart.easeOut,
          'chain': 'cancel'
        }, this.options.resizeOptions)
      ),
      'fade': new Fx.Tween(null, $merge({
          'property': 'opacity',
          'duration': (Browser.Engine.trident) ? 0 : 300,
          'chain': 'cancel'
        }, this.options.fxOptions)).addEvents({
          'onComplete': function() {
            if (!this.element.get('opacity')) this.element.setStyle('display', 'none');
          },
          'onStart': function() {
            if (!this.element.get('opacity')) this.element.setStyle('display', '');
          }
        }
      )
    };
    this.tweens.fade.element = $$();

    if (this.options.shadow) {
      if (Browser.Engine.webkit420) {
        this.box.setStyle('-webkit-box-shadow', '0 0 10px rgba(0, 0, 0, 0.7)');
      } else if (!Browser.Engine.trident4) {
        var shadow = new Element('div', {'class': 'remooz-bg-wrap'}).inject(this.box);
        ['n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw'].each(function(dir) {
          new Element('div', {'class': 'remooz-bg remooz-bg-' + dir}).inject(shadow);
        });
        this.tweens.bg = new Fx.Tween(shadow, {
          'property': 'opacity',
          'chain': 'cancel'
        }).set(0);
        this.addEvent(this.options.shadow, this.tweens.bg.set.bind(this.tweens.bg, 1), true);
        this.addEvent('onClose', this.tweens.bg.set.bind(this.tweens.bg, 0), true);
      }
    }

    if (this.options.closer) {
      var closer = new Element('a', {
        'class': 'remooz-btn-close',
        'events': {'click': this.bound.close}
      }).inject(this.box);
      this.tweens.fade.element.push(closer);
    }
    this.body = new Element('div', {'class': 'remooz-body'}).inject(this.box);

    var title = this.options.title || this.options.generateTitle.call(this, this.element);
    if (title) { // thx ie6
      var title = new Element('div', {'class': 'remooz-title'}).adopt(
        new Element('div', {'class': 'remooz-title-bg', 'opacity': this.options.opacityTitle}),
        new Element('div', {'class': 'remooz-title-content'}).adopt(title)
      ).inject(this.box);
      this.tweens.fade.element.push(title);
    }
    this.tweens.fade.set(0).fireEvent('onComplete');

    this.drag = new Drag.Move(this.box, {
      'snap': 15,
      'preventDefault': true,
      'onBeforeStart': function() {
        if (!this.focused && !this.loading) ReMooz.focus(this);
        else if (this.loading || this.options.closeOnClick) this.box.addEvent('mouseup', this.bound.dragClose);
      }.bind(this),
      'onSnap': function() {
        this.box.removeEvent('mouseup', this.bound.dragClose);
        if (!this.options.dragging) this.drag.stop();
        else this.box.addClass('remooz-box-dragging');
      }.bind(this),
      'onComplete': function() {
        this.box.removeClass('remooz-box-dragging');
      }.bind(this)
    });
    this.drag.detach();

    this.fireEvent('onBuild', this.box, this.element);
    this.box.inject(this.element.getDocument().body);
  }

};
ReMooz = new Class(ReMooz);

ReMooz.factory = function(extended) {
  return $extend(this, extended);
};

ReMooz.factory(new Options).factory({

  options: {
    zIndex: 10001,
    zIndexFocus: 10005,
    query: 'a.remooz',
    modal: false
  },

  assign: function(elements, options) {
    return $$(elements).map(function(element) {
      if (element.preppedReMooz) return; element.preppedReMooz = true;
      return new ReMooz(element, options);
    }, this);
  },

  stack: [],

  open: function(obj) {
    var last = this.stack.getLast();
    this.focus(obj);
    if (last && this.options.modal) last.close();
  },

  close: function(obj) {
    var length = this.stack.length - 1;
    if (length > 1 && this.stack[length] == obj) this.focus(this.stack[length - 1]);
    this.stack.erase(obj);
  },

  focus: function(obj) {
    var last = this.stack.getLast();
    obj.fireEvent('onFocus', [obj]);
    if (last == obj) return;
    if (last) last.fireEvent('onBlur', [last]);
    this.stack.erase(obj).push(obj);
  }

});