//Imports
import { Client as Gmap } from "@googlemaps/google-maps-services-js"
import color from "color"
import * as d3 from "d3"
import {D3node} from "../../../app/metrics/utils.mjs"

/**
 * Worldmap
 * Mostly ported from https://github.com/dyatko/worldstar
 * License: https://raw.githubusercontent.com/dyatko/worldstar/master/LICENSE
 */
export default async function(login, {locations, sample, imports, token}) {
  //Parse geocodes
  let stars = new Map()
  if (token) {
    const cache = new Map()
    const get = new Gmap()
    locations = imports.shuffle(locations.filter(string => string).map(string => string.toLocaleLowerCase())).slice(0, sample || Infinity)
    for (const location of locations) {
      console.debug(`metrics/compute/${login}/plugins > stargazers > worldmap > looking for ${location}`)
      if (!cache.has(location)) {
        try {
          const {data: {results}} = await get.geocode({params: {address: location, key: token}})
          const country = results.at(0).address_components.find(({types}) => types.includes("country"))
          cache.set(location, country.short_name ?? country.long_name)
          console.debug(`metrics/compute/${login}/plugins > stargazers > worldmap > ${location} resolved to ${cache.get(location)}`)
        }
        catch (error) {
          console.debug(`metrics/compute/${login}/plugins > stargazers > worldmap > failed to resolve ${location}: ${error}`)
        }
      }
      const code = cache.get(location)
      stars.set(code, (stars.get(code) ?? 0) + 1)
    }
  }
  else {
    throw {error: {message: "Google Maps API token is not set"}}
  }

  //Generate SVG
  const d3n = new D3node()
  const svg = d3n.createSVG(480, 315)
  const countries = JSON.parse(await imports.fs.readFile(imports.paths.join(imports.__module(import.meta.url), "atlas/50m_countries.geojson")))
  const geopath = d3.geoPath(d3.geoMercator().fitWidth(svg.attr("width"), countries))
  const splits = [...new Set([0, ...stars.values()])].sort((a, b) => a - b)
  svg
    .append("g")
    .selectAll("path")
    .data(countries.features)
    .join("path")
    .attr("id", ({id}) => id)
    .style("fill", ({properties: {iso_a2, wb_a2, sov_a3}}) => {
      const code = iso_a2?.match(/[A-Z]{2}/) ? iso_a2 : wb_a2?.match(/[A-Z]{2}/) ? wb_a2 : sov_a3?.substr(0, 2) ?? ""
      const value = stars.get(code)
      return color("#216e39").mix(color("#ffffff"), 1 - Math.max(0, splits.indexOf(value)) / splits.length).hex()
    })
    .style("stroke", "#afafaf")
    .style("stroke-width", "0.6px")
    .attr("d", geopath)

  return d3n.svgString()
}