import Ember from 'ember';

import d3 from 'd3';

import ENV from 'app-client/config/environment';

import _ from 'lodash/lodash';

export default Ember.Component.extend({

    constants: Ember.inject.service(),

    filter: Ember.inject.service(),

    filterObserver: Ember.observer('filter.language', function() {

        Ember.$('.node').removeClass("selected");

        Ember.$('.node[data-id="' + this.get('filter').get('language') + '"]').addClass("selected");

    }),

    didInsertElement: function(){

        var self = this;

        var baseurl = ENV.rootURL.replace(/\/$/,"")+'/api/v1';

        d3.json(baseurl+"/languages", function(languages) {

            var margin = { top: 30, right: 0, bottom: 0, left: 0 };

            var width = $('#' + self.get('elementId')).width();

            var height = $('#' + self.get('elementId')).height() - margin.top - margin.bottom;

            var array = Object.keys(languages).map(function (key) { return languages[key]; });

            var oldMin = Math.min(...array),

                oldMax = Math.max(...array);

            var sum = array.reduce(function(a, b) { return a + b; });

            var average = sum / array.length;

            var newMin = Math.floor((average - oldMin)),

                newMax = Math.floor((oldMax - average));

            var x = d3.scale.linear()

                .domain([0, width])

                .range([0, width]),

                y = d3.scale.linear()

                .domain([0, height])

                .range([0, height]);

            var treemap = d3.layout.treemap()

                .children(function(d, depth) { return depth ? null : d._children; })

                .sort(function(a, b) { return a.value - b.value; })

                .value(function(d){

                    return Math.floor((((d.value - oldMin) * (newMax - newMin)) / (oldMax - oldMin)) + newMin);

                })

                .round(false);

            var element = d3.select('#' + self.get('elementId'))

                .style("width", width + margin.left + margin.right + 'px')

                .style("height", height + margin.bottom + margin.top + 'px')

                .style("margin-left", -margin.left + "px")

                .style("margin-right", -margin.right + "px")

                .attr("transform", "translate(" + margin.left + "," + margin.top + ")")

                .style("shape-rendering", "crispEdges");

            var breadcrumbs = element.insert("div", ":first-child")

                .attr("class", "breadcrumbs")

                .attr("y", -margin.top)

                .style("width", width + 'px')

                .style("height", margin.top + 'px');

            var root = _.cloneDeep(self.constants.LANGUAGES_TREEMAP);

            root.x = root.y = 0;

            root.dx = width;

            root.dy = height;

            root.depth = 0;

            var transitioning = false;

            accumulate(root);

            layout(root);

            display(root);

            function accumulate(d) {

                d._children = d.children;

                if(d.children) {

                    d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0);

                } else {

                    d.value = languages[d.id] ? languages[d.id] : 0;

                }

                return d.value;

            }

            function layout(d) {

                if (d._children) {

                    treemap.nodes({_children: d._children});

                    d._children.forEach(function(c) {

                        function getCount(node, count = 0) {

                            var c = languages[node.id];

                            if(typeof c === 'undefined') {

                                node._children.forEach(function(child) {

                                    count = getCount(child, count);

                                });

                                return count;

                            } else {

                                return count + c;

                            }

                        }

                        c.count = getCount(c);

                        c.x = d.x + c.x * d.dx;

                        c.y = d.y + c.y * d.dy;

                        c.dx *= d.dx;

                        c.dy *= d.dy;

                        c.parent = d;

                        layout(c);

                    });

                }

            }

            function position() {

                return this.style("width", function(d) { return x(d.x + d.dx) - x(d.x) + 'px'; })

                    .style("height", function(d) { return y(d.y + d.dy) - y(d.y) + 'px'; })

                    .style("left", function(d) { return x(d.x) + 'px'; })

                    .style("top", function(d) { return y(d.y) + 'px'; });

            }

            function display(d) {

                breadcrumbs

                    .datum(d.parent)

                    .html(name(d))

                    .on("click", transition);

                var nodes = element.append("div")

                    .attr("class", "nodes")

                    .datum(d);

                var node = nodes.selectAll()

                    .data(d._children)

                    .enter()

                    .append("div")

                    .attr("data-id", function(d) { return d.id; });

                node.attr("class", function(d) { return "node" + ( d.id === self.get('filter').get('language') ? " selected" : "" ); })

                    .call(position)

                    .on("click", selectHandler);

                node.filter(function(d) { return d._children; })

                    .classed("children", true)

                    .on("click", transition)

                    .append("i")

                    .attr("class", "fa fa-folder-o");

                node.append("span")

                    .html(function(d) { return d.name + ' <span class="count">(' + d.count + ')</span>'; });

                function transition(d) {

                    if (transitioning || !d) {

                        return;

                    }

                    selectHandler(d);

                    transitioning = true;

                    var newNode = display(d),

                    transitionNodes = node.transition().duration(750),

                    transitionNewNodes = newNode.transition().duration(750);

                    x.domain([d.x, d.x + d.dx]);

                    y.domain([d.y, d.y + d.dy]);

                    element.style("shape-rendering", null);

                    element.selectAll(".node").sort(function(a, b) { return a.depth - b.depth; });

                    newNode.selectAll().style("fill-opacity", 0);

                    transitionNodes.style("opacity", 0)

                        .call(position);

                    transitionNewNodes.style("opacity", 1)

                        .call(position);

                    transitionNodes.remove().each("end", function() {

                        element.style("shape-rendering", "crispEdges");

                        transitioning = false;

                    });

                }

                function selectHandler (d){

                    if (d.id){

                        self.get('filter').set('language', d.id);

                    }

                }

                return node;

            }

            function name(d) {

                return d.parent ? name(d.parent) + '<span class="level">' + d.name + '</span>' : '<span class="root">' + d.name + '</span>';

            }

        });

    }

});