import { Util, Collection } from './Util';
import { Factory } from './Factory';
import { Node, NodeConfig } from './Node';
import { DD } from './DragAndDrop';
import { getNumberValidator } from './Validators';

import { GetSet, IRect } from './types';
import { Shape } from './Shape';

export interface ContainerConfig extends NodeConfig {
  clearBeforeDraw?: boolean;
  clipFunc?: (ctx: CanvasRenderingContext2D) => void;
  clipX?: number;
  clipY?: number;
  clipWidth?: number;
  clipHeight?: number;
}

/**
 * Container constructor.  Containers are used to contain nodes or other containers
 * @constructor
 * @memberof Konva
 * @augments Konva.Node
 * @abstract
 * @param {Object} config
 * @@nodeParams
 * @@containerParams
 */
export abstract class Container extends Node<ContainerConfig> {
  children = new Collection();

  /**
   * returns a {@link Konva.Collection} of direct descendant nodes
   * @method
   * @name Konva.Container#getChildren
   * @param {Function} [filterFunc] filter function
   * @returns {Konva.Collection}
   * @example
   * // get all children
   * var children = layer.getChildren();
   *
   * // get only circles
   * var circles = layer.getChildren(function(node){
   *    return node.getClassName() === 'Circle';
   * });
   */
  getChildren(filterFunc?: (item: Node) => boolean) {
    if (!filterFunc) {
      return this.children;
    }

    var results = new Collection();
    this.children.each(function(child) {
      if (filterFunc(child)) {
        results.push(child);
      }
    });
    return results;
  }
  /**
   * determine if node has children
   * @method
   * @name Konva.Container#hasChildren
   * @returns {Boolean}
   */
  hasChildren() {
    return this.getChildren().length > 0;
  }
  /**
   * remove all children
   * @method
   * @name Konva.Container#removeChildren
   */
  removeChildren() {
    var child;
    for (var i = 0; i < this.children.length; i++) {
      child = this.children[i];
      // reset parent to prevent many _setChildrenIndices calls
      child.parent = null;
      child.index = 0;
      child.remove();
    }
    this.children = new Collection();
    return this;
  }
  /**
   * destroy all children
   * @method
   * @name Konva.Container#destroyChildren
   */
  destroyChildren() {
    var child;
    for (var i = 0; i < this.children.length; i++) {
      child = this.children[i];
      // reset parent to prevent many _setChildrenIndices calls
      child.parent = null;
      child.index = 0;
      child.destroy();
    }
    this.children = new Collection();
    return this;
  }
  abstract _validateAdd(node: Node): void;
  /**
   * add a child and children into container
   * @name Konva.Container#add
   * @method
   * @param {...Konva.Node} child
   * @returns {Container}
   * @example
   * layer.add(rect);
   * layer.add(shape1, shape2, shape3);
   * // remember to redraw layer if you changed something
   * layer.draw();
   */
  add(child: Node) {
    if (arguments.length > 1) {
      for (var i = 0; i < arguments.length; i++) {
        this.add(arguments[i]);
      }
      return this;
    }
    if (child.getParent()) {
      child.moveTo(this);
      return this;
    }
    var children = this.children;
    this._validateAdd(child);
    child.index = children.length;
    child.parent = this;
    children.push(child);
    this._fire('add', {
      child: child
    });

    // if node under drag we need to update drag animation
    if (child.isDragging()) {
      DD.anim.setLayers(child.getLayer());
    }

    // chainable
    return this;
  }
  destroy() {
    if (this.hasChildren()) {
      this.destroyChildren();
    }
    super.destroy();
    return this;
  }
  /**
   * return a {@link Konva.Collection} of nodes that match the selector.
   * You can provide a string with '#' for id selections and '.' for name selections.
   * Or a function that will return true/false when a node is passed through.  See example below.
   * With strings you can also select by type or class name. Pass multiple selectors
   * separated by a space.
   * @method
   * @name Konva.Container#find
   * @param {String | Function} selector
   * @returns {Collection}
   * @example
   *
   * Passing a string as a selector
   * // select node with id foo
   * var node = stage.find('#foo');
   *
   * // select nodes with name bar inside layer
   * var nodes = layer.find('.bar');
   *
   * // select all groups inside layer
   * var nodes = layer.find('Group');
   *
   * // select all rectangles inside layer
   * var nodes = layer.find('Rect');
   *
   * // select node with an id of foo or a name of bar inside layer
   * var nodes = layer.find('#foo, .bar');
   *
   * Passing a function as a selector
   *
   * // get all groups with a function
   * var groups = stage.find(node => {
   *  return node.getType() === 'Group';
   * });
   *
   * // get only Nodes with partial opacity
   * var alphaNodes = layer.find(node => {
   *  return node.getType() === 'Node' && node.getAbsoluteOpacity() < 1;
   * });
   */
  find(selector) {
    // protecting _generalFind to prevent user from accidentally adding
    // second argument and getting unexpected `findOne` result
    return this._generalFind(selector, false);
  }

  get(selector) {
    Util.warn(
      'collection.get() method is deprecated. Please use collection.find() instead.'
    );
    return this.find(selector);
  }
  /**
   * return a first node from `find` method
   * @method
   * @name Konva.Container#findOne
   * @param {String | Function} selector
   * @returns {Konva.Node | Undefined}
   * @example
   * // select node with id foo
   * var node = stage.findOne('#foo');
   *
   * // select node with name bar inside layer
   * var nodes = layer.findOne('.bar');
   *
   * // select the first node to return true in a function
   * var node = stage.findOne(node => {
   *  return node.getType() === 'Shape'
   * })
   */
  findOne(selector) {
    var result = this._generalFind(selector, true);
    return result.length > 0 ? result[0] : undefined;
  }
  _generalFind(selector, findOne) {
    var retArr = [];

    this._descendants(node => {
      const valid = node._isMatch(selector);
      if (valid) {
        retArr.push(node);
      }
      if (valid && findOne) {
        return true;
      }
      return false;
    });

    return Collection.toCollection(retArr);
  }
  private _descendants(fn) {
    let shouldStop = false;
    for (var i = 0; i < this.children.length; i++) {
      const child = this.children[i];
      shouldStop = fn(child);
      if (shouldStop) {
        return true;
      }
      if (!child.hasChildren()) {
        continue;
      }
      shouldStop = (child as Container)._descendants(fn);
      if (shouldStop) {
        return true;
      }
    }
    return false;
  }
  // extenders
  toObject() {
    var obj = Node.prototype.toObject.call(this);

    obj.children = [];

    var children = this.getChildren();
    var len = children.length;
    for (var n = 0; n < len; n++) {
      var child = children[n];
      obj.children.push(child.toObject());
    }

    return obj;
  }
  _getDescendants(arr) {
    var retArr = [];
    var len = arr.length;
    for (var n = 0; n < len; n++) {
      var node = arr[n];
      if (this.isAncestorOf(node)) {
        retArr.push(node);
      }
    }

    return retArr;
  }
  /**
   * determine if node is an ancestor
   * of descendant
   * @method
   * @name Konva.Container#isAncestorOf
   * @param {Konva.Node} node
   */
  isAncestorOf(node) {
    var parent = node.getParent();
    while (parent) {
      if (parent._id === this._id) {
        return true;
      }
      parent = parent.getParent();
    }

    return false;
  }
  clone(obj?) {
    // call super method
    var node = Node.prototype.clone.call(this, obj);

    this.getChildren().each(function(no) {
      node.add(no.clone());
    });
    return node;
  }
  /**
   * get all shapes that intersect a point.  Note: because this method must clear a temporary
   * canvas and redraw every shape inside the container, it should only be used for special situations
   * because it performs very poorly.  Please use the {@link Konva.Stage#getIntersection} method if at all possible
   * because it performs much better
   * @method
   * @name Konva.Container#getIntersection
   * @param {Object} pos
   * @param {Number} pos.x
   * @param {Number} pos.y
   * @returns {Array} array of shapes
   */
  getAllIntersections(pos) {
    var arr = [];

    this.find('Shape').each(function(shape: Shape) {
      if (shape.isVisible() && shape.intersects(pos)) {
        arr.push(shape);
      }
    });

    return arr;
  }
  _setChildrenIndices() {
    this.children.each(function(child, n) {
      child.index = n;
    });
  }
  drawScene(can, top, caching) {
    var layer = this.getLayer(),
      canvas = can || (layer && layer.getCanvas()),
      context = canvas && canvas.getContext(),
      cachedCanvas = this._getCanvasCache(),
      cachedSceneCanvas = cachedCanvas && cachedCanvas.scene;

    if (this.isVisible() || caching) {
      if (!caching && cachedSceneCanvas) {
        context.save();
        layer._applyTransform(this, context, top);
        this._drawCachedSceneCanvas(context);
        context.restore();
      } else {
        // TODO: comment all arguments here
        // describe why we use false for caching
        // and why we use caching for skipBuffer, skipComposition
        this._drawChildren(canvas, 'drawScene', top, false, caching, caching);
      }
    }
    return this;
  }
  drawHit(can, top, caching) {
    var layer = this.getLayer(),
      canvas = can || (layer && layer.hitCanvas),
      context = canvas && canvas.getContext(),
      cachedCanvas = this._getCanvasCache(),
      cachedHitCanvas = cachedCanvas && cachedCanvas.hit;

    if (this.shouldDrawHit(canvas) || caching) {
      if (!caching && cachedHitCanvas) {
        context.save();
        layer._applyTransform(this, context, top);
        this._drawCachedHitCanvas(context);
        context.restore();
      } else {
        // TODO: comment all arguments here
        // describe why we use false for caching
        // and why we use caching for skipBuffer, skipComposition
        this._drawChildren(canvas, 'drawHit', top, false, caching, caching);
      }
    }
    return this;
  }
  // TODO: create ClipContainer
  _drawChildren(
    canvas,
    drawMethod,
    top,
    caching?,
    skipBuffer?,
    skipComposition?
  ) {
    var layer = this.getLayer(),
      context = canvas && canvas.getContext(),
      clipWidth = this.clipWidth(),
      clipHeight = this.clipHeight(),
      clipFunc = this.clipFunc(),
      hasClip = (clipWidth && clipHeight) || clipFunc,
      clipX,
      clipY;

    if (hasClip && layer) {
      context.save();
      var transform = this.getAbsoluteTransform(top);
      var m = transform.getMatrix();
      context.transform(m[0], m[1], m[2], m[3], m[4], m[5]);
      context.beginPath();
      if (clipFunc) {
        clipFunc.call(this, context, this);
      } else {
        clipX = this.clipX();
        clipY = this.clipY();
        context.rect(clipX, clipY, clipWidth, clipHeight);
      }
      context.clip();
      m = transform
        .copy()
        .invert()
        .getMatrix();
      context.transform(m[0], m[1], m[2], m[3], m[4], m[5]);
    }

    var hasComposition =
      this.globalCompositeOperation() !== 'source-over' && !skipComposition;
    if (hasComposition && layer) {
      context.save();
      context._applyGlobalCompositeOperation(this);
    }

    this.children.each(function(child) {
      child[drawMethod](canvas, top, caching, skipBuffer);
    });
    if (hasComposition && layer) {
      context.restore();
    }

    if (hasClip && layer) {
      context.restore();
    }
  }
  shouldDrawHit(canvas?) {
    var layer = this.getLayer();
    var layerUnderDrag =
      DD.isDragging && DD.anim.getLayers().indexOf(layer) !== -1;
    return (
      (canvas && canvas.isCache) ||
      (layer && layer.hitGraphEnabled() && this.isVisible() && !layerUnderDrag)
    );
  }
  getClientRect(attrs): IRect {
    attrs = attrs || {};
    var skipTransform = attrs.skipTransform;
    var relativeTo = attrs.relativeTo;

    var minX, minY, maxX, maxY;
    var selfRect = {
      x: Infinity,
      y: Infinity,
      width: 0,
      height: 0
    };
    var that = this;
    this.children.each(function(child) {
      // skip invisible children
      if (!child.visible()) {
        return;
      }

      var rect = child.getClientRect({
        relativeTo: that,
        skipShadow: attrs.skipShadow,
        skipStroke: attrs.skipStroke
      });

      // skip invisible children (like empty groups)
      if (rect.width === 0 && rect.height === 0) {
        return;
      }

      if (minX === undefined) {
        // initial value for first child
        minX = rect.x;
        minY = rect.y;
        maxX = rect.x + rect.width;
        maxY = rect.y + rect.height;
      } else {
        minX = Math.min(minX, rect.x);
        minY = Math.min(minY, rect.y);
        maxX = Math.max(maxX, rect.x + rect.width);
        maxY = Math.max(maxY, rect.y + rect.height);
      }
    });

    // if child is group we need to make sure it has visible shapes inside
    var shapes = this.find('Shape');
    var hasVisible = false;
    for (var i = 0; i < shapes.length; i++) {
      var shape = shapes[i];
      if (shape._isVisible(this)) {
        hasVisible = true;
        break;
      }
    }

    if (hasVisible) {
      selfRect = {
        x: minX,
        y: minY,
        width: maxX - minX,
        height: maxY - minY
      };
    } else {
      selfRect = {
        x: 0,
        y: 0,
        width: 0,
        height: 0
      };
    }

    if (!skipTransform) {
      return this._transformedRect(selfRect, relativeTo);
    }
    return selfRect;
  }

  clip: GetSet<IRect, this>;
  clipX: GetSet<number, this>;
  clipY: GetSet<number, this>;
  clipWidth: GetSet<number, this>;
  clipHeight: GetSet<number, this>;
  clipFunc: GetSet<(ctx: CanvasRenderingContext2D, shape: this) => void, this>;
}

// add getters setters
Factory.addComponentsGetterSetter(Container, 'clip', [
  'x',
  'y',
  'width',
  'height'
]);
/**
 * get/set clip
 * @method
 * @name Konva.Container#clip
 * @param {Object} clip
 * @param {Number} clip.x
 * @param {Number} clip.y
 * @param {Number} clip.width
 * @param {Number} clip.height
 * @returns {Object}
 * @example
 * // get clip
 * var clip = container.clip();
 *
 * // set clip
 * container.clip({
 *   x: 20,
 *   y: 20,
 *   width: 20,
 *   height: 20
 * });
 */

Factory.addGetterSetter(Container, 'clipX', undefined, getNumberValidator());
/**
 * get/set clip x
 * @name Konva.Container#clipX
 * @method
 * @param {Number} x
 * @returns {Number}
 * @example
 * // get clip x
 * var clipX = container.clipX();
 *
 * // set clip x
 * container.clipX(10);
 */

Factory.addGetterSetter(Container, 'clipY', undefined, getNumberValidator());
/**
 * get/set clip y
 * @name Konva.Container#clipY
 * @method
 * @param {Number} y
 * @returns {Number}
 * @example
 * // get clip y
 * var clipY = container.clipY();
 *
 * // set clip y
 * container.clipY(10);
 */

Factory.addGetterSetter(
  Container,
  'clipWidth',
  undefined,
  getNumberValidator()
);
/**
 * get/set clip width
 * @name Konva.Container#clipWidth
 * @method
 * @param {Number} width
 * @returns {Number}
 * @example
 * // get clip width
 * var clipWidth = container.clipWidth();
 *
 * // set clip width
 * container.clipWidth(100);
 */

Factory.addGetterSetter(
  Container,
  'clipHeight',
  undefined,
  getNumberValidator()
);
/**
 * get/set clip height
 * @name Konva.Container#clipHeight
 * @method
 * @param {Number} height
 * @returns {Number}
 * @example
 * // get clip height
 * var clipHeight = container.clipHeight();
 *
 * // set clip height
 * container.clipHeight(100);
 */

Factory.addGetterSetter(Container, 'clipFunc');
/**
 * get/set clip function
 * @name Konva.Container#clipFunc
 * @method
 * @param {Function} function
 * @returns {Function}
 * @example
 * // get clip function
 * var clipFunction = container.clipFunc();
 *
 * // set clip height
 * container.clipFunc(function(ctx) {
 *   ctx.rect(0, 0, 100, 100);
 * });
 */

Collection.mapMethods(Container);