//Setup
export default async function({login, graphql, data, imports, q, queries, account}, {enabled = false} = {}) {
  //Plugin execution
  try {
    //Check if plugin is enabled and requirements are met
    if ((!enabled) || (!q.stargazers))
      return null

    //Load inputs
    let {"charts.type":_charts} = imports.metadata.plugins.stargazers.inputs({data, account, q})

    //Retrieve stargazers from graphql api
    console.debug(`metrics/compute/${login}/plugins > stargazers > querying api`)
    const repositories = data.user.repositories.nodes.map(({name:repository, owner:{login:owner}}) => ({repository, owner})) ?? []
    const dates = []
    for (const {repository, owner} of repositories) {
      //Iterate through stargazers
      console.debug(`metrics/compute/${login}/plugins > stargazers > retrieving stargazers of ${repository}`)
      let cursor = null
      let pushed = 0
      do {
        console.debug(`metrics/compute/${login}/plugins > stargazers > retrieving stargazers of ${repository} after ${cursor}`)
        const {repository:{stargazers:{edges}}} = await graphql(queries.stargazers({login:owner, repository, after:cursor ? `after: "${cursor}"` : ""}))
        cursor = edges?.[edges?.length - 1]?.cursor
        dates.push(...edges.map(({starredAt}) => new Date(starredAt)))
        pushed = edges.length
      } while ((pushed) && (cursor))
      //Limit repositories
      console.debug(`metrics/compute/${login}/plugins > stargazers > loaded ${dates.length} stargazers for ${repository}`)
    }
    console.debug(`metrics/compute/${login}/plugins > stargazers > loaded ${dates.length} stargazers in total`)

    //Compute stargazers increments
    const days = 14 * (1 + data.large / 2)
    const increments = {dates:Object.fromEntries([...new Array(days).fill(null).map((_, i) => [new Date(Date.now() - i * 24 * 60 * 60 * 1000).toISOString().slice(0, 10), 0]).reverse()]), max:NaN, min:NaN}
    dates
      .map(date => date.toISOString().slice(0, 10))
      .filter(date => date in increments.dates)
      .map(date => increments.dates[date]++)
    increments.min = Math.min(...Object.values(increments.dates))
    increments.max = Math.max(...Object.values(increments.dates))

    //Compute total stargazers
    let {stargazers} = data.computed.repositories
    const total = {dates:{...increments.dates}, max:NaN, min:NaN}
    {
      const dates = Object.keys(total.dates)
      for (let i = dates.length - 1; i >= 0; i--) {
        const date = dates[i], tomorrow = dates[i + 1]
        stargazers -= (increments.dates[tomorrow] ?? 0)
        total.dates[date] = stargazers
      }
    }
    total.min = Math.min(...Object.values(total.dates))
    total.max = Math.max(...Object.values(total.dates))

    //Months name
    const months = ["", "Jan.", "Feb.", "Mar.", "Apr.", "May", "June", "July", "Aug.", "Sep.", "Oct.", "Nov.", "Dec."]

    //Generating charts
    let charts = null
    if (_charts === "chartist") {
      console.debug(`metrics/compute/${login}/plugins > stargazers > generating charts`)
      charts = await Promise.all([{data:total, low:total.min, high:total.max}, {data:increments, ref:0, low:increments.min, high:increments.max, sign:true}].map(({data:{dates:set}, high, low, ref, sign = false}) => imports.chartist("line", {
        width:480 * (1 + data.large),
        height:160,
        showPoint:true,
        axisX:{showGrid:false},
        axisY:{showLabel:false, offset: 20, labelInterpolationFnc:value => imports.format(value, {sign}), high, low, referenceValue: ref},
        showArea:true,
        fullWidth: true,
      }, {
        labels:Object.keys(set).map((date, i, a) => {
          const day = date.substring(date.length-2)
          if ((i === 0)||((a[i+1])&&(date.substring(0, 7) !== a[i+1].substring(0, 7))))
            return `${day} ${months[Number(date.substring(5, 7))]}`
          return day
        }),
        series:[Object.values(set)],
      })))
      data.postscripts.push(`(${function (format) {
        document.querySelectorAll(".stargazers .chartist").forEach((chart, sign) => {
          chart.querySelectorAll(".stargazers .chartist .ct-point").forEach(node => {
            const [x, y, value] = ["x1", "y1", "ct:value"].map(attribute => node.getAttribute(attribute))
            const text = document.createElementNS("http://www.w3.org/2000/svg", "text")
            text.setAttributeNS(null, "x", x)
            text.setAttributeNS(null, "y", y-5)
            text.setAttributeNS(null, "class", "ct-post")
            text.appendChild(document.createTextNode(format(value, {sign})))
            node.parentNode.append(text)
          })
        })
      }})(${imports.format.toString()})`)
    }

    //Results
    return {total, increments, months, charts}
  }
  //Handle errors
  catch (error) {
    throw {error:{message:"An error occured", instance:error}}
  }
}