/* global d3, _*/
'use strict'

var newDataSets = [
  {
    meta: {
      id: 1,
      name: 'A'
    },
    data: [
      {x: 1, y: 10},
      {x: 2, y: 20},
      {x: 3, y: 30},
      {x: 4, y: 40},
      {x: 5, y: 50}
    ]
  },
  {
    meta: {
      id: 3,
      name: 'C'
    },
    data: [
      {x: 100, y: 10},
      {x: 200, y: 20},
      {x: 300, y: 30},
      {x: 400, y: 40},
      {x: 500, y: 50}
    ]
  }
]

var newDataSets2 = [
  {
    meta: {
      id: 1,
      name: 'A'
    },
    data: [
      {x: 10, y: 10},
      {x: 20, y: 20},
      {x: 30, y: 30},
      {x: 40, y: 40},
      {x: 50, y: 50}
    ]
  },
  {
    meta: {
      id: 2,
      name: 'B'
    },
    data: [
      {x: 10, y: 1},
      {x: 20, y: 2},
      {x: 30, y: 3},
      {x: 40, y: 4},
      {x: 50, y: 5}
    ]
  },
  {
    meta: {
      id: 3,
      name: 'C'
    },
    data: [
      {x: 100, y: 10},
      {x: 200, y: 20},
      {x: 300, y: 30},
      {x: 400, y: 40},
      {x: 500, y: 50}
    ]
  }
]

var firstDataSets = [
  {
    meta: {
      id: 1,
      name: 'A'
    },
    data: [
      {x: 10, y: 10},
      {x: 20, y: 20},
      {x: 30, y: 30},
      {x: 40, y: 40},
      {x: 50, y: 50}
    ]
  },
  {
    meta: {
      id: 2,
      name: 'B'
    },
    data: [
      {x: 10, y: 1},
      {x: 20, y: 2},
      {x: 30, y: 3},
      {x: 40, y: 4},
      {x: 50, y: 5}
    ]
  }
]

var __width = 500
var __height = 500
var _margin = {top: 50, right: 50, bottom: 50, left: 50}

var getId = function (dataset) { return dataset.meta.id }
var getLabel = function (dataset) { return dataset.meta.name }
var getData = function (dataset) { return dataset.data }
var getLastData = function (dataset) { return dataset.data[dataset.data.length - 1] }

var getX = function (data) { return data.x }
var getY = function (data) { return data.y }

var _width = __width - _margin.left - _margin.right
var _height = __height - _margin.top - _margin.bottom

var xScale = d3.scale.linear().range([0, _width])
var yScale = d3.scale.linear().range([_height, 0])

var line = d3.svg.line().interpolate('linear')
    .x(function (data) { return xScale(getX(data)) })
    .y(function (data) { return yScale(getY(data)) })

var dataTooltip = d3.select('#container')
    .append('div')
    .classed('data-tooltip', true)

var svg = d3.select('#container')
    .append('svg')
    .attr('width', __width)
    .attr('height', __height)

var g = svg.append('g')
    .attr('transform',
          'translate(' + _margin.left + ',' + _margin.top + ')')

setInterval(function () {
  var dataSetsArray = [newDataSets, newDataSets2, firstDataSets]
  var randDataSets = dataSetsArray[Math.floor(Math.random() * dataSetsArray.length)]

  render(randDataSets)
}, 2000)

function render (datasets) {
//   ltWatch({'dataset': datasets.length, 'date': Date.now()})
  var xs = _.chain(datasets).map(getData).flatten().map(getX).value()
  var ys = _.chain(datasets).map(getData).flatten().map(getY).value()

  xScale.domain(d3.extent(xs))
  yScale.domain(d3.extent(ys))

  var xAxis = d3.svg.axis().scale(xScale).orient('bottom')
  var yAxis = d3.svg.axis().scale(yScale).orient('left')

  if (g.selectAll('g.x.axis').empty()) {
    g.append('g')
        .classed('x axis', true)
        .attr('transform', 'translate(0,' + _height + ')')
        .call(xAxis)
  } else {
    g.selectAll('g.x.axis')
        .transition().duration(1000)
        .call(xAxis)
  }

  if (g.selectAll('g.y.axis').empty()) {
    g.append('g')
        .classed('y axis', true)
        .call(yAxis)
  } else {
    g.selectAll('g.y.axis')
        .transition().duration(1000)
        .call(yAxis)
  }

  // bind dataset
  var datasetContainers = g.selectAll('g.dataset')
      .data(datasets, getId)

  // enter
  datasetContainers
      .enter().append('g')
          .classed('dataset', true)
          .attr('id', function (dataset) { return getId(dataset) })
      .on('mouseover', function (dataset) {
        var self = this

        var gs = d3.selectAll('g.dataset')
        gs.filter(function () { return self.id !== this.id })
            .transition().duration(1000)
            .style('opacity', 0.2)
      })
      .on('mouseout', function (dataset) {
        var self = this

        var gs = d3.selectAll('g.dataset')
        gs.filter(function () { return self.id !== this.id })
            .transition().duration(1000)
            .style('opacity', 1.0)
      })
      .style('opacity', 0.0)
      .transition().duration(1000)
      .style('opacity', 1.0)

  datasetContainers.selectAll('path.line')
      .data(function (dataset) { return [dataset] })
      .enter().append('path')
          .classed('line', true)
          .attr('d', function (dataset) { return line(getData(dataset)) })

  datasetContainers.selectAll('circle.point')
      .data(function (dataset) { return getData(dataset) })
      .enter().append('circle')
          .classed('point', true)
          .attr('cx', function (data) { return xScale(getX(data)) })
          .attr('cy', function (data) { return yScale(getY(data)) })
          .attr('r', 4)
      .on('mouseover', function (data) {
        d3.select(this)
            .transition().duration(1000)
            .attr('r', 5)
            .style('stroke-width', '3px')

        var dataTooltipContainer = dataTooltip.data([data])
        dataTooltipContainer.append('div')
                            .classed('x', true)
                            .html(getX)
        dataTooltipContainer.append('div')
                            .classed('y', true)
                            .html(getY)

        dataTooltipContainer.append('div')
                            .classed('data-tooltip-arrow', true)

        dataTooltip
            .transition().duration(1000)
            .style('left', (+d3.select(this).attr('cx') + _margin.left) + 'px')
            .style('top', (+d3.select(this).attr('cy') + _margin.top) + 'px')
            .style('opacity', 1)
            .style('display', 'block')
      })
      .on('mouseout', function (data) {
        d3.select(this)
            .transition().duration(1000)
            .attr('r', 4)
            .style('stroke-width', '2px')

        // hide tooltip
        dataTooltip
            .transition().duration(1000)
            .style('opacity', 0)
            .style('display', 'none')
        dataTooltip.selectAll('.x').remove()
        dataTooltip.selectAll('.y').remove()
        dataTooltip.selectAll('.data-tooltip-arrow').remove()
      })

  datasetContainers.selectAll('text.label')
      .data(function (dataset) { return [dataset] })
      .enter().append('text')
          .classed('label', true)
          .attr('x', function (dataset) { return xScale(getX(getLastData(dataset))) })
          .attr('y', function (dataset) { return yScale(getY(getLastData(dataset))) })
          .text(getLabel)

  // exit
  datasetContainers
      .exit()
          .transition().duration(1000)
          .style('opacity', 0.0)
          .remove()

  // update
  datasetContainers
      .selectAll('path.line')
      .transition().duration(1000)
      .attr('d', function (dataset) { return line(getData(dataset)) })

  datasetContainers
      .selectAll('circle.point')
      .transition().duration(1000)
      .attr('cx', function (data) { return xScale(getX(data)) })
      .attr('cy', function (data) { return yScale(getY(data)) })

  datasetContainers
      .selectAll('text.label')
      .transition().duration(1000)
      .attr('x', function (dataset) { return xScale(getX(getLastData(dataset))) })
      .attr('y', function (dataset) { return yScale(getY(getLastData(dataset))) })
}