#!/usr/bin/env nu

let chapters = {
  2: 7,
  3: 9,
  4: 19,
  6: 15,
  7: 21,
  8: 22,
}

let gradients = [
  [0, [60, 0, 0]],
  [0.65, [180, 180, 0]],
  [1, [0, 120, 0]],
]

let formatColor = {|color| $"rgb\(($color.0), ($color.1), ($color.2)\)" }

let interpColor = {|p| 
  let next = ($gradients
    | enumerate
    | skip until { $p <= $in.item.0 }
    | get index).0
  if $next == 0 { return (do $formatColor ($gradients.0.1)) }
  let prev = ($gradients | get ($next - 1))
  let next = ($gradients | get $next)
  let pp = ($p - $prev.0) / ($next.0 - $prev.0)

  let color = ($prev.1 | zip $next.1 | each {|a| $a.0 * (1 - $pp) + $a.1 * $pp})
  do $formatColor $color
}

let viz = { |k, n, cell| 
  let ratio = $k / $n
  let percent = $ratio * 100 | math round --precision 1
  let color = if $n == 0 { "gray" } else { do $interpColor $ratio }
  let textColor = if $k == $n { "gold" } else { "white" }
  let isExercise = $cell.0.section == "Exercise"
  let percentStr = $"<small style=\"font-size: 0.7rem\">($percent)%</small>"

  $"<div class=\"cell\" style=\"
      background-color: ($color);
      color: ($textColor);
    \">
    <span>($k)&nbsp;/&nbsp;($n)</span>
    (if ($isExercise) { $percentStr })
  </div>" | str replace -a "\n" ""
  # $n | math round --precision 1 
}

let vizCh = { |n, table| 
  let noExercises = $table | where type != "Exercise"
  let completed = $noExercises | where completed == "x" | length
  let total = $noExercises | where type != "Exercise" | length
  let ratio = if $total != 0 { $completed / $total } else { 0 }
  let percent = ($ratio * 100 | math round --precision 1)
  let color = if $n == 0 { "gray" } else { do $interpColor $ratio }
  let textColor = if $completed == $total { "gold" } else { "white" }

  $"<div data-ch=\"($n)\" class=\"cell\" style=\"
      background-color: ($color);
      color: ($textColor);
    \">
    <h3>($n)</h3>
    <small>($completed) / ($total)</small>
    <small style=\"font-size: 0.5rem;\">($percent)%</small>
  </div>" | str replace -a "\n" ""
}

let vizChapter = { |n| 
  let nStr = $n | into string
  let url = $"https://git.mzhang.io/api/v1/repos/school/type-theory/issues/($chapters | get $nStr)"

  let table = curl -s $url
    | jq -r .body
    | lines
    | rg -o $"\\[\(x| \)\\] \(.*\) \(\\d+\(\\.\\d+\)*\)" -r "$1,$2,$3"
    | from csv --noheaders
    | rename completed type number
    | insert section { if $in.type == "Exercise" { "Exercise" } else { $in.number | split row "." | get 1 } }
  
  let table2 = $table
    | group-by section
    | transpose
    | each { $in | update column1 {
        do $viz ($in | where completed == "x" | length) ($in | length) $in
      } }
    | sort-by -n column0

  let newColumn1 = { column0: "Ch", column1: (do $vizCh $n $table) }
  let newColumn2 = { column0: "Chnum", column1: $n }

  let table3 = if ($table2 | is-empty) {
    [$newColumn1, $newColumn2]
  } else {
    $table2 | prepend $newColumn1 | prepend $newColumn2
  }

  $table3
    | transpose -r
}

$chapters
  | columns
  | each { do $vizChapter $in }
  | reduce {|it, acc| $acc | append $it }
  | sort-by Chnum
  | reject Chnum
  | transpose
  | sort-by -n column0
  | transpose -r
  | move Ch --before 0
  | to md
  | tee { save -f html/src/generated/Progress.md }

# open breakdown.json
#   | transpose
#   | each {|row| [$row.column0, $row.column1.ratioCompleted] }