var EventEmitter = require('event-emitter');
var core = require('../../core');
var EpubCFI = require('../../epubcfi');
var Contents = require('../../contents');
var URI = require('urijs');

function InlineView(section, options) {
	this.settings = core.extend({
		ignoreClass : '',
		axis: 'vertical',
		width: 0,
		height: 0,
		layout: undefined,
		globalLayoutProperties: {},
	}, options || {});

	this.id = "epubjs-view:" + core.uuid();
	this.section = section;
	this.index = section.index;

	this.element = this.container(this.settings.axis);

	this.added = false;
	this.displayed = false;
	this.rendered = false;

	this.width  = this.settings.width;
	this.height = this.settings.height;

	this.fixedWidth  = 0;
	this.fixedHeight = 0;

	// Blank Cfi for Parsing
	this.epubcfi = new EpubCFI();

	this.layout = this.settings.layout;
	// Dom events to listen for
	// this.listenedEvents = ["keydown", "keyup", "keypressed", "mouseup", "mousedown", "click", "touchend", "touchstart"];

};

InlineView.prototype.container = function(axis) {
	var element = document.createElement('div');

	element.classList.add("epub-view");

	// if(this.settings.axis === "horizontal") {
	//   element.style.width = "auto";
	//   element.style.height = "0";
	// } else {
	//   element.style.width = "0";
	//   element.style.height = "auto";
	// }

	element.style.overflow = "hidden";

	if(axis && axis == "horizontal"){
		element.style.display = "inline-block";
	} else {
		element.style.display = "block";
	}

	return element;
};

InlineView.prototype.create = function() {

	if(this.frame) {
		return this.frame;
	}

	if(!this.element) {
		this.element = this.createContainer();
	}

	this.frame = document.createElement('div');
	this.frame.id = this.id;
	this.frame.style.overflow = "hidden";
	this.frame.style.wordSpacing = "initial";
	this.frame.style.lineHeight = "initial";

	this.resizing = true;

	// this.frame.style.display = "none";
	this.element.style.visibility = "hidden";
	this.frame.style.visibility = "hidden";

	if(this.settings.axis === "horizontal") {
		this.frame.style.width = "auto";
		this.frame.style.height = "0";
	} else {
		this.frame.style.width = "0";
		this.frame.style.height = "auto";
	}

	this._width = 0;
	this._height = 0;

	this.element.appendChild(this.frame);
	this.added = true;

	this.elementBounds = core.bounds(this.element);

	return this.frame;
};

InlineView.prototype.render = function(request, show) {

	// view.onLayout = this.layout.format.bind(this.layout);
	this.create();

	// Fit to size of the container, apply padding
	this.size();

	// Render Chain
	return this.section.render(request)
		.then(function(contents){
			return this.load(contents);
		}.bind(this))
		// .then(function(doc){
		// 	return this.hooks.content.trigger(view, this);
		// }.bind(this))
		.then(function(){
			// this.settings.layout.format(view.contents);
			// return this.hooks.layout.trigger(view, this);
		}.bind(this))
		// .then(function(){
		// 	return this.display();
		// }.bind(this))
		// .then(function(){
		// 	return this.hooks.render.trigger(view, this);
		// }.bind(this))
		.then(function(){

			// apply the layout function to the contents
			this.settings.layout.format(this.contents);

			// Expand the iframe to the full size of the content
			// this.expand();

			// Listen for events that require an expansion of the iframe
			this.addListeners();

			if(show !== false) {
				//this.q.enqueue(function(view){
					this.show();
				//}, view);
			}
			// this.map = new Map(view, this.layout);
			//this.hooks.show.trigger(view, this);
			this.emit("rendered", this.section);

		}.bind(this))
		.catch(function(e){
			this.emit("loaderror", e);
		}.bind(this));

};

// Determine locks base on settings
InlineView.prototype.size = function(_width, _height) {
	var width = _width || this.settings.width;
	var height = _height || this.settings.height;

	if(this.layout.name === "pre-paginated") {
		// TODO: check if these are different than the size set in chapter
		this.lock("both", width, height);
	} else if(this.settings.axis === "horizontal") {
		this.lock("height", width, height);
	} else {
		this.lock("width", width, height);
	}

};

// Lock an axis to element dimensions, taking borders into account
InlineView.prototype.lock = function(what, width, height) {
	var elBorders = core.borders(this.element);
	var iframeBorders;

	if(this.frame) {
		iframeBorders = core.borders(this.frame);
	} else {
		iframeBorders = {width: 0, height: 0};
	}

	if(what == "width" && core.isNumber(width)){
		this.lockedWidth = width - elBorders.width - iframeBorders.width;
		this.resize(this.lockedWidth, false); //  width keeps ratio correct
	}

	if(what == "height" && core.isNumber(height)){
		this.lockedHeight = height - elBorders.height - iframeBorders.height;
		this.resize(false, this.lockedHeight);
	}

	if(what === "both" &&
		 core.isNumber(width) &&
		 core.isNumber(height)){

		this.lockedWidth = width - elBorders.width - iframeBorders.width;
		this.lockedHeight = height - elBorders.height - iframeBorders.height;

		this.resize(this.lockedWidth, this.lockedHeight);
	}

};

// Resize a single axis based on content dimensions
InlineView.prototype.expand = function(force) {
	var width = this.lockedWidth;
	var height = this.lockedHeight;

	var textWidth, textHeight;

	if(!this.frame || this._expanding) return;

	this._expanding = true;

	// Expand Horizontally
	if(this.settings.axis === "horizontal") {
		width = this.contentWidth(textWidth);
	} // Expand Vertically
	else if(this.settings.axis === "vertical") {
		height = this.contentHeight(textHeight);
	}

	// Only Resize if dimensions have changed or
	// if Frame is still hidden, so needs reframing
	if(this._needsReframe || width != this._width || height != this._height){
		this.resize(width, height);
	}

	this._expanding = false;
};

InlineView.prototype.contentWidth = function(min) {
	return this.frame.scrollWidth;
};

InlineView.prototype.contentHeight = function(min) {
	console.log(this.frame.scrollHeight);
	return this.frame.scrollHeight;
};


InlineView.prototype.resize = function(width, height) {

	if(!this.frame) return;

	if(core.isNumber(width)){
		this.frame.style.width = width + "px";
		this._width = width;
	}

	if(core.isNumber(height)){
		this.frame.style.height = height + "px";
		this._height = height;
	}

	this.prevBounds = this.elementBounds;

	this.elementBounds = core.bounds(this.element);

	size = {
		width: this.elementBounds.width,
		height: this.elementBounds.height,
		widthDelta: this.elementBounds.width - this.prevBounds.width,
		heightDelta: this.elementBounds.height - this.prevBounds.height,
	};

	this.onResize(this, size);

	this.emit("resized", size);

};


InlineView.prototype.load = function(contents) {
	var loading = new core.defer();
	var loaded = loading.promise;
	var doc = core.parse(contents, "text/html");
	var body = core.qs(doc, "body");

	var srcs = doc.querySelectorAll("[src]");
	Array.prototype.slice.call(srcs)
		.forEach(function(item) {
			var src = item.getAttribute('src');
			var assetUri = URI(src);
			var origin = assetUri.origin();
			var absoluteUri;

			if (!origin) {
				absoluteUri = assetUri.absoluteTo(this.section.url);
				item.src = absoluteUri;
			}
		}.bind(this));

	this.frame.innerHTML = body.innerHTML;

	this.document = this.frame.ownerDocument;
	this.window = this.document.defaultView;

	this.contents = new Contents(this.document, this.frame);

	this.rendering = false;

	loading.resolve(this.contents);


	return loaded;
};

InlineView.prototype.setLayout = function(layout) {
	this.layout = layout;
};


InlineView.prototype.resizeListenters = function() {
	// Test size again
	// clearTimeout(this.expanding);
	// this.expanding = setTimeout(this.expand.bind(this), 350);
};

InlineView.prototype.addListeners = function() {
	//TODO: Add content listeners for expanding
};

InlineView.prototype.removeListeners = function(layoutFunc) {
	//TODO: remove content listeners for expanding
};

InlineView.prototype.display = function(request) {
	var displayed = new core.defer();

	if (!this.displayed) {

		this.render(request).then(function () {

			this.emit("displayed", this);
			this.onDisplayed(this);

			this.displayed = true;

			displayed.resolve(this);

		}.bind(this));

	} else {
		displayed.resolve(this);
	}


	return displayed.promise;
};

InlineView.prototype.show = function() {

	this.element.style.visibility = "visible";

	if(this.frame){
		this.frame.style.visibility = "visible";
	}

	this.emit("shown", this);
};

InlineView.prototype.hide = function() {
	// this.frame.style.display = "none";
	this.element.style.visibility = "hidden";
	this.frame.style.visibility = "hidden";

	this.stopExpanding = true;
	this.emit("hidden", this);
};

InlineView.prototype.position = function() {
	return this.element.getBoundingClientRect();
};

InlineView.prototype.locationOf = function(target) {
	var parentPos = this.frame.getBoundingClientRect();
	var targetPos = this.contents.locationOf(target, this.settings.ignoreClass);

	return {
		"left": window.scrollX + parentPos.left + targetPos.left,
		"top": window.scrollY + parentPos.top + targetPos.top
	};
};

InlineView.prototype.onDisplayed = function(view) {
	// Stub, override with a custom functions
};

InlineView.prototype.onResize = function(view, e) {
	// Stub, override with a custom functions
};

InlineView.prototype.bounds = function() {
	if(!this.elementBounds) {
		this.elementBounds = core.bounds(this.element);
	}
	return this.elementBounds;
};

InlineView.prototype.destroy = function() {

	if(this.displayed){
		this.displayed = false;

		this.removeListeners();

		this.stopExpanding = true;
		this.element.removeChild(this.frame);
		this.displayed = false;
		this.frame = null;

		this._textWidth = null;
		this._textHeight = null;
		this._width = null;
		this._height = null;
	}
	// this.element.style.height = "0px";
	// this.element.style.width = "0px";
};

EventEmitter(InlineView.prototype);

module.exports = InlineView;