// Copyright (c) 2013 Adobe Systems Incorporated. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import eve from './eve.js'
import { Snap } from './svg.js'
import mina from './mina.js'

Snap.plugin(function (Snap, Element, Paper, glob) {
  var mmax = Math.max,
    mmin = Math.min

  // Set
  var Set = function (items) {
      this.items = []
      this.bindings = {}
      this.length = 0
      this.type = 'set'
      if (items) {
        for (var i = 0, ii = items.length; i < ii; i++) {
          if (items[i]) {
            this[this.items.length] = this.items[this.items.length] = items[i]
            this.length++
          }
        }
      }
    },
    setproto = Set.prototype
  /*\
     * Set.push
     [ method ]
     **
     * Adds each argument to the current set
     = (object) original element
    \*/
  setproto.push = function () {
    var item, len
    for (var i = 0, ii = arguments.length; i < ii; i++) {
      item = arguments[i]
      if (item) {
        len = this.items.length
        this[len] = this.items[len] = item
        this.length++
      }
    }
    return this
  }
  /*\
     * Set.pop
     [ method ]
     **
     * Removes last element and returns it
     = (object) element
    \*/
  setproto.pop = function () {
    this.length && delete this[this.length--]
    return this.items.pop()
  }
  /*\
     * Set.forEach
     [ method ]
     **
     * Executes given function for each element in the set
     *
     * If the function returns `false`, the loop stops running.
     **
     - callback (function) function to run
     - thisArg (object) context object for the callback
     = (object) Set object
    \*/
  setproto.forEach = function (callback, thisArg) {
    for (var i = 0, ii = this.items.length; i < ii; i++) {
      if (callback.call(thisArg, this.items[i], i) === false) {
        return this
      }
    }
    return this
  }
  /*\
     * Set.animate
     [ method ]
     **
     * Animates each element in set in sync.
     *
     **
     - attrs (object) key-value pairs of destination attributes
     - duration (number) duration of the animation in milliseconds
     - easing (function) #optional easing function from @mina or custom
     - callback (function) #optional callback function that executes when the animation ends
     * or
     - animation (array) array of animation parameter for each element in set in format `[attrs, duration, easing, callback]`
     > Usage
     | // animate all elements in set to radius 10
     | set.animate({r: 10}, 500, mina.easein);
     | // or
     | // animate first element to radius 10, but second to radius 20 and in different time
     | set.animate([{r: 10}, 500, mina.easein], [{r: 20}, 1500, mina.easein]);
     = (Element) the current element
    \*/
  setproto.animate = function (attrs, ms, easing, callback) {
    if (typeof easing == 'function' && !easing.length) {
      callback = easing
      easing = mina.linear
    }
    if (attrs instanceof Snap._.Animation) {
      callback = attrs.callback
      easing = attrs.easing
      ms = easing.dur
      attrs = attrs.attr
    }
    var args = arguments
    if (Snap.is(attrs, 'array') && Snap.is(args[args.length - 1], 'array')) {
      var each = true
    }
    var begin,
      handler = function () {
        if (begin) {
          this.b = begin
        } else {
          begin = this.b
        }
      },
      cb = 0,
      set = this,
      callbacker =
        callback &&
        function () {
          if (++cb == set.length) {
            callback.call(this)
          }
        }
    return this.forEach(function (el, i) {
      eve.once('snap.animcreated.' + el.id, handler)
      if (each) {
        args[i] && el.animate.apply(el, args[i])
      } else {
        el.animate(attrs, ms, easing, callbacker)
      }
    })
  }
  /*\
     * Set.remove
     [ method ]
     **
     * Removes all children of the set.
     *
     = (object) Set object
    \*/
  setproto.remove = function () {
    while (this.length) {
      this.pop().remove()
    }
    return this
  }
  /*\
     * Set.bind
     [ method ]
     **
     * Specifies how to handle a specific attribute when applied
     * to a set.
     *
     **
     - attr (string) attribute name
     - callback (function) function to run
     * or
     - attr (string) attribute name
     - element (Element) specific element in the set to apply the attribute to
     * or
     - attr (string) attribute name
     - element (Element) specific element in the set to apply the attribute to
     - eattr (string) attribute on the element to bind the attribute to
     = (object) Set object
    \*/
  setproto.bind = function (attr, a, b) {
    var data = {}
    if (typeof a == 'function') {
      this.bindings[attr] = a
    } else {
      var aname = b || attr
      this.bindings[attr] = function (v) {
        data[aname] = v
        a.attr(data)
      }
    }
    return this
  }
  /*\
     * Set.attr
     [ method ]
     **
     * Equivalent of @Element.attr.
     = (object) Set object
    \*/
  setproto.attr = function (value) {
    var unbound = {}
    for (var k in value) {
      if (this.bindings[k]) {
        this.bindings[k](value[k])
      } else {
        unbound[k] = value[k]
      }
    }
    for (var i = 0, ii = this.items.length; i < ii; i++) {
      this.items[i].attr(unbound)
    }
    return this
  }
  /*\
     * Set.clear
     [ method ]
     **
     * Removes all elements from the set
    \*/
  setproto.clear = function () {
    while (this.length) {
      this.pop()
    }
  }
  /*\
     * Set.splice
     [ method ]
     **
     * Removes range of elements from the set
     **
     - index (number) position of the deletion
     - count (number) number of element to remove
     - insertion… (object) #optional elements to insert
     = (object) set elements that were deleted
    \*/
  setproto.splice = function (index, count, insertion) {
    index = index < 0 ? mmax(this.length + index, 0) : index
    count = mmax(0, mmin(this.length - index, count))
    var tail = [],
      todel = [],
      args = [],
      i
    for (i = 2; i < arguments.length; i++) {
      args.push(arguments[i])
    }
    for (i = 0; i < count; i++) {
      todel.push(this[index + i])
    }
    for (; i < this.length - index; i++) {
      tail.push(this[index + i])
    }
    var arglen = args.length
    for (i = 0; i < arglen + tail.length; i++) {
      this.items[index + i] = this[index + i] =
        i < arglen ? args[i] : tail[i - arglen]
    }
    i = this.items.length = this.length -= count - arglen
    while (this[i]) {
      delete this[i++]
    }
    return new Set(todel)
  }
  /*\
     * Set.exclude
     [ method ]
     **
     * Removes given element from the set
     **
     - element (object) element to remove
     = (boolean) `true` if object was found and removed from the set
    \*/
  setproto.exclude = function (el) {
    for (var i = 0, ii = this.length; i < ii; i++)
      if (this[i] == el) {
        this.splice(i, 1)
        return true
      }
    return false
  }
  /*\
     * Set.insertAfter
     [ method ]
     **
     * Inserts set elements after given element.
     **
     - element (object) set will be inserted after this element
     = (object) Set object
    \*/
  setproto.insertAfter = function (el) {
    var i = this.items.length
    while (i--) {
      this.items[i].insertAfter(el)
    }
    return this
  }
  /*\
     * Set.getBBox
     [ method ]
     **
     * Union of all bboxes of the set. See @Element.getBBox.
     = (object) bounding box descriptor. See @Element.getBBox.
    \*/
  setproto.getBBox = function () {
    var x = [],
      y = [],
      x2 = [],
      y2 = []
    for (var i = this.items.length; i--; )
      if (!this.items[i].removed) {
        var box = this.items[i].getBBox()
        x.push(box.x)
        y.push(box.y)
        x2.push(box.x + box.width)
        y2.push(box.y + box.height)
      }
    x = mmin.apply(0, x)
    y = mmin.apply(0, y)
    x2 = mmax.apply(0, x2)
    y2 = mmax.apply(0, y2)
    return {
      x: x,
      y: y,
      x2: x2,
      y2: y2,
      width: x2 - x,
      height: y2 - y,
      cx: x + (x2 - x) / 2,
      cy: y + (y2 - y) / 2
    }
  }
  /*\
     * Set.insertAfter
     [ method ]
     **
     * Creates a clone of the set.
     **
     = (object) New Set object
    \*/
  setproto.clone = function (s) {
    s = new Set()
    for (var i = 0, ii = this.items.length; i < ii; i++) {
      s.push(this.items[i].clone())
    }
    return s
  }
  setproto.toString = function () {
    return 'Snap\u2018s set'
  }
  setproto.type = 'set'
  // export
  /*\
     * Snap.Set
     [ property ]
     **
     * Set constructor.
    \*/
  Snap.Set = Set
  /*\
     * Snap.set
     [ method ]
     **
     * Creates a set and fills it with list of arguments.
     **
     = (object) New Set object
     | var r = paper.rect(0, 0, 10, 10),
     |     s1 = Snap.set(), // empty set
     |     s2 = Snap.set(r, paper.circle(100, 100, 20)); // prefilled set
    \*/
  Snap.set = function () {
    var set = new Set()
    if (arguments.length) {
      set.push.apply(set, Array.prototype.slice.call(arguments, 0))
    }
    return set
  }
})