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(),

  didInsertElement: function(){

    var _this = this;

    var margin = {top: 20, right: 0, bottom: 0, left: 0},

        width = Ember.$("#chart_div").width(),

        height = 600 - margin.top - margin.bottom,

        formatNumber = d3.format(",d"),

        transitioning;

    var x = d3.scale.linear()

        .domain([0, width])

        .range([0, width]);

    var 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; })

        .ratio(height / width * 0.5 * (1 + Math.sqrt(5)))

        .round(false);

    var svg = d3.select("#chart_div").append("svg")

        .attr("width", width + margin.left + margin.right)

        .attr("height", height + margin.bottom + margin.top)

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

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

      .append("g")

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

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

    var grandparent = svg.append("g")

        .attr("class", "grandparent");

    grandparent.append("rect")

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

        .attr("width", width)

        .attr("height", margin.top);

    grandparent.append("text")

        .attr("x", 6)

        .attr("y", 6 - margin.top)

        .attr("dy", ".75em");

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

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

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

      initialize(root);

      accumulate(root);

      layout(root);

      display(root);

      function initialize(root) {

        root.x = root.y = 0;

        root.dx = width;

        root.dy = height;

        root.depth = 0;

      }

      // Aggregate the values for internal nodes. This is normally done by the

      // treemap layout, but not here because of our custom implementation.

      // We also take a snapshot of the original children (_children) to avoid

      // the children being overwritten when when layout is computed.

      function accumulate(d) {

        d._children = d.children;

        if(d.children) {

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

        } else if (_.isArray(d.id)) {

          d.value = d.id.reduce(

            function(s,lid) { return s + (languages[lid]?languages[lid]:0); },

            0

          );

        }

        else {

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

        }

        return d.value;

      }

      // Compute the treemap layout recursively such that each group of siblings

      // uses the same size (1×1) rather than the dimensions of the parent cell.

      // This optimizes the layout for the current zoom state. Note that a wrapper

      // object is created for the parent node for each group of siblings so that

      // the parent’s dimensions are not discarded as we recurse. Since each group

      // of sibling was laid out in 1×1, we must rescale to fit using absolute

      // coordinates. This lets us use a viewport to zoom.

      function layout(d) {

        if (d._children) {

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

          d._children.forEach(function(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 display(d) {

        grandparent

            .datum(d.parent)

            .on("click", transition)

            .select("text")

            .text(name(d));

        var g1 = svg.insert("g", ".grandparent")

            .datum(d)

            .attr("class", "depth");

        var g = g1.selectAll("g")

            .data(d._children)

            .enter().append("g");

        g.classed("bla", true).on("click", selectHandler);

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

            .classed("children", true)

            .on("click", transition);

        g.append("rect")

            .attr("class", "parent")

            // .attr("fill", (d.color || "#bbb"))

            .call(rect)

          .append("title")

            .text(function(d) { return formatNumber(d.value); });

        g.append("text")

            .attr("dy", ".75em")

            .text(function(d) { return d.name; })

            .call(text);

        function transition(d) {

          if (transitioning || !d) { return; }

          selectHandler(d);

          transitioning = true;

          var g2 = display(d),

              t1 = g1.transition().duration(750),

              t2 = g2.transition().duration(750);

          // Update the domain only after entering new elements.

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

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

          // Enable anti-aliasing during the transition.

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

          // Draw child nodes on top of parent nodes.

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

          // Fade-in entering text.

          g2.selectAll("text").style("fill-opacity", 0);

          // Transition to the new view.

          t1.selectAll("text").call(text).style("fill-opacity", 0);

          t2.selectAll("text").call(text).style("fill-opacity", 1);

          t1.selectAll("rect").call(rect);

          t2.selectAll("rect").call(rect);

          // Remove the old node when the transition is finished.

          t1.remove().each("end", function() {

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

            transitioning = false;

          });

        }

        function selectHandler (d){

          if (d.name === "Global"){

            return _this.sendAction('action', null);

          }

          _this.sendAction('action', d.name);

        }

        return g;

      }

      function text(text) {

        text.attr("x", function(d) { return x(d.x) + 6; })

            .attr("y", function(d) { return y(d.y) + 6; });

      }

      function rect(rect) {

        rect.attr("x", function(d) { return x(d.x); })

            .attr("y", function(d) { return y(d.y); })

            .attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })

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

            .attr("fill", function(d) { return (d.color || "#bbb"); });

      }

      function name(d) {

        return d.parent ? name(d.parent) + "." + d.name : d.name;

      }

    });

  }

});