import React, { useState, useEffect } from "react";
import * as d3 from "d3";
import {
  toLocale,
  truncateValueForDisplay,
  numToAlphabeticalString,
  formatLargeOrSmall,
} from "./utils.js";

const displayWidthPercentage = 0.7; // 0.85; // 0.7

let getlength = (number) => number.toString().length;

export function removeOldSvg() {
  d3.select("#graph").select("svg").remove();
}

function drawGraphInner({ nodes, links }) {
  // List of node ids for convenience
  var nodeids = nodes.map((node) => node.id);
  var positionById = {};
  nodeids.forEach((nodeid, i) => (positionById[nodeid] = i));
  console.log("NodeIds/positionById");
  console.log(nodeids);
  console.log(positionById);

  // Calculate the dimensions
  // let margin = { top: 0, right: 30, bottom: 20, left: 30 };
  // let width = 900 - margin.left - margin.right;

  let initialWindowWidth = window.innerWidth;
  let margin = { top: 0, right: 10, bottom: 20, left: 10 };
  let width =
    initialWindowWidth * displayWidthPercentage - margin.left - margin.right;

  var x = d3.scalePoint().range([0, width]).domain(nodeids);

  let heights = links.map((link) => {
    let start = x(positionById[link.source]);
    let end = x(positionById[link.target]);
    return Math.abs(start - end) / 2 + 70; // Magic constant.
  });
  console.log(heights);
  let maxheight = Math.max(...heights);
  let height = maxheight - margin.top - margin.bottom;
  console.log(`height: ${height}`);

  // Build the d3 graph

  removeOldSvg();
  var svg = d3
    .select("#graph")
    .append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

  // A linear scale to position the nodes on the X axis

  // Add the circle for the nodes
  svg
    .selectAll("mynodes")
    .data(nodes)
    .enter()
    .append("circle")
    .attr("cx", function (d) {
      return x(d.id);
    })
    .attr("cy", height - 30)
    .attr("r", 8)
    .style("fill", "#69b3a2");

  // And give them a label
  svg
    .selectAll("mylabels")
    .data(nodes)
    .enter()
    .append("text")
    .attr("x", function (d) {
      return x(d.id);
    })
    .attr("y", height - 10)
    .text(function (d) {
      return numToAlphabeticalString(d.position);
    })
    .style("text-anchor", "middle");

  // Add the links
  svg
    .selectAll("mylinks")
    .data(links)
    .enter()
    .append("path")
    .attr("d", function (d) {
      let start = x(d.source);
      // X position of start node on the X axis
      let end = x(d.target);
      // X position of end node
      return (
        [
          "M",
          start,
          height - 30,
          // the arc starts at the coordinate x=start, y=height-30 (where the starting node is)
          "A",
          // This means we're gonna build an elliptical arc
          (start - end) / 2,
          ",",
          // Next 2 lines are the coordinates of the inflexion point. Height of this point is proportional with start - end distance
          (start - end) / 2,
          0,
          0,
          ",",
          start < end ? 1 : 0,
          end,
          ",",
          height - 30,
        ]
          // We always want the arc on top. So if end is before start, putting 0 here turn the arc upside down.
          .join(" ")
      );
    })
    .style("fill", "none")
    .attr("stroke", "green"); // black

  // labels for links
  // smaller font.
  svg
    .selectAll("mylinks")
    .data(links)
    .enter()
    .append("text")
    .attr("x", function (d) {
      let start = x(d.source);
      // X position of start node on the X axis
      let end = x(d.target);
      // X position of end node
      return start + (end - start) / 2; //-4*getlength(d.distance)
    })
    .attr("y", function (d) {
      let start = x(d.source);
      // X position of start node on the X axis
      let end = x(d.target);
      // X position of end node
      return height - 36 - Math.abs(start - end) / 2; //height-30
    })
    .text(function (d) {
      let distanceFormatted = formatLargeOrSmall(Number(d.distance));
      if (d.distance == d.squiggleString || !d.squiggleString) {
        return distanceFormatted;
      } else {
        // return `${d.squiggleString} → ${distanceFormatted}`;
        return `(${d.squiggleString})`;
      }

      // return (truncateValueForDisplay(Number(d.distance)))
      //return(Number(d.distance).toPrecision(2).toString())
    })
    .style("text-anchor", "middle");
}

export function DrawGraph({
  isListOrdered,
  orderedList,
  listOfElements,
  links,
}) {
  if (isListOrdered) {
    let nodes = orderedList.map((id, pos) => ({
      ...listOfElements[id],
      position: pos,
    }));
    drawGraphInner({ nodes, links });
  }
  return (
    <div>
      <div id="graph"></div>
    </div>
  );
}