import d3 from 'd3';
import _ from 'lodash';
import { VislibLibErrorHandlerProvider } from './_error_handler';
import { TooltipProvider } from 'ui/vis/components/tooltip';

export function VislibLibChartTitleProvider(Private) {
  const ErrorHandler = Private(VislibLibErrorHandlerProvider);
  const Tooltip = Private(TooltipProvider);

  class ChartTitle extends ErrorHandler {
    constructor(visConfig) {
      super();
      this.el = visConfig.get('el');
      this.tooltip = new Tooltip('chart-title', this.el, function (d) {
        return '<p>' + _.escape(d.label) + '</p>';
      });
    }

    render() {
      const el = d3.select(this.el).select('.chart-title').node();
      const width = el ? el.clientWidth : 0;
      const height = el ? el.clientHeight : 0;

      return d3.select(this.el).selectAll('.chart-title').call(this.draw(width, height));
    }

    truncate(size) {
      const self = this;

      return function (selection) {
        selection.each(function () {
          const text = d3.select(this);
          const n = text[0].length;
          const maxWidth = size / n * 0.9;
          const length = this.getComputedTextLength();
          let str;
          let avg;
          let end;

          if (length > maxWidth) {
            str = text.text();
            avg = length / str.length;
            end = Math.floor(maxWidth / avg) - 5;
            str = str.substr(0, end) + '...';
            self.addMouseEvents(text);

            return text.text(str);
          }

          return text.text();
        });
      };
    }

    addMouseEvents(target) {
      if (this.tooltip) {
        return target.call(this.tooltip.render());
      }
    }

    draw(width, height) {
      const self = this;

      return function (selection) {
        selection.each(function () {
          const div = d3.select(this);
          const dataType = this.parentNode.__data__.rows ? 'rows' : 'columns';
          const size = dataType === 'rows' ? height : width;
          const txtHtOffset = 11;

          self.validateWidthandHeight(width, height);

          div.append('svg')
          .attr('width', width)
          .attr('height', height)
          .append('text')
          .attr('transform', function () {
            if (dataType === 'rows') {
              return 'translate(' + txtHtOffset + ',' + height / 2 + ')rotate(270)';
            }
            return 'translate(' + width / 2 + ',' + txtHtOffset + ')';
          })
          .attr('text-anchor', 'middle')
          .text(function (d) {
            return d.label;
          });

          // truncate long chart titles
          div.selectAll('text').call(self.truncate(size));
        });
      };
    }
  }

  return ChartTitle;
}
