use math
use re
use str

fn chars {|v|
  str:split '' $v
}

fn len {|v|
  chars $v | count
}

fn string {|v|
  var k = (kind-of $v)
  if (eq $k 'string') {
    put $v
  } elif (eq $k 'number') {
    to-string $v
  } elif (eq $k 'bool') {
    if $v {
      put 'X'
    } else {
      put ''
    }
  } elif (eq $k 'list') {
    each $string~ $v | str:join ''
  } elif (eq $v $nil) {
    put ''
  } else {
    to-string $v
  }
}

fn int {|v|
  var k = (kind-of $v)
  if (eq $k 'string') {
    try {
      var n = (math:trunc $v)
      var s @_ = (str:split '.' (to-string $n))
      put $s
    } except e {
      fail (printf '%s n’est pas un nombre' $v)
    }
  } elif (eq $k 'number') {
    int (to-string $v)
  } elif (eq $k 'bool') {
    if $v {
      put 1
    } else {
      put 0
    }
  } elif (eq $v $nil) {
    put 0
  } else {
    put 0
  }
}

fn repeat {|n s|
  use builtin
  builtin:repeat $n $s | str:join ''
}

fn blank {|n|
  repeat $n ' '
}

fn left {|str size|
  var l = (len $str)
  if (< $l $size) {
    string [ $str (blank (- $size $l)) ]
  } elif (== $l $size) {
    put $str
  } else {
    string [ (chars $str) ][..$size]
  }
}

fn right {|str size|
  var l = (len $str)
  if (< $l $size) {
    string [ (blank (- $size $l)) $str ]
  } elif (== $l $size) {
    put $str
  } else {
    string [ (chars $str) ][(- $l $size)..]
  }
}

fn center {|str size|
  var l = (len $str)
  if (< $l $size) {
    var d = (- $size $l)
    var b = (math:trunc (/ $d 2))
    var e = (- $d $b)
    string [ (blank $b) $str (blank $e) ]
  } elif (== $l $size) {
    put $str
  } else {
    var d = (- $l $size)
    var b = (math:trunc (/ $d 2))
    var e = (+ $b $size)
    string [ (chars $str) ][$b..$e]
  }
}

var -align = [
  &center=$center~
  &right=$right~
  &left=$left~
]

fn column {|&align=left name @label|
  var c = [
    &name=$name
    &align=$-align[$align]
    &size=0
    &label=''
  ]
  if (> (count $label) 0) {
    set c[label] = $label[0]
    set c[size]  = (count $label[0])
  }
  put $c
}

fn update-props {|props data|
  each {|d|
    set @props = (each {|c|
      var n = $c[name]
      if (has-key $d $n) {
        var v = (string $d[$n])
        var l = (count $v)
        if (< $c[size] $l) {
          set c[size] = $l
        }
      }
      put $c
    } $props)
  } $data
  put $props
}

fn line-header {|&sep=' ' props|
  var @data = (each {|c|
    $c[align] $c[label] $c[size]
  } $props)
  str:join $sep $data
}

fn line {|&sep=' ' props line|
  var @data = (each {|c|
    var n v = $c[name] ''
    if (has-key $line $n) {
      set v = (string $line[$n])
    }
    $c[align] $v $c[size]
  } $props)
  str:join $sep $data
}

fn list {|&with-header=$true &csep=' ' &hsep='-' &recompute=$true props data|
  if $recompute {
    set props = (update-props $props $data)
  }
  if $with-header {
    echo (line-header &sep=$csep $props)
    if (bool $hsep) {
      var s = (* (- (count $props) 1) (count $csep))
      each {|c|
        set s = (+ $s $c[size])
      } $props
      echo (repeat (math:trunc (/ $s (count $hsep))) $hsep)
    }
  }
  each {|d|
    echo (line &sep=$csep $props $d)
  } $data
}