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/*
Copyright © 2011 MLstate

This file is part of Opa.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/**
* Colors management
*/

package stdlib.core.color
import stdlib.core.parser

/**
* {1 About this module}
*
* {1 Where should I start ?}
*
* {1 What if I need more?}
*/

/**
* {1 Types defined in this module}
*/

type color = Color.color

type Color.color = { r : int ; g : int ; b : int ; a : int}

type Color.color_hsv = {h:float s:float v:float}

/**
* {1 Interface}
*/

Color = {{

  // from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
  to_hsv(c : Color.color) : Color.color_hsv =
    (r, g, b) = (Float.of_int(c.r), Float.of_int(c.g), Float.of_int(c.b));
    r = r/255.; g = g/255.; b = b/255.;
    max = max(r, max(g, b)); min = min(r, min(g, b));
    (h, _s, v) = (max, max, max);

    d = max - min;
    s = if (max == 0.) then 0. else d / max;

    h =
      if(max == min)
      then
        0. // achromatic
      else
        h = if (max == r)
            then (g - b) / d + (if (g < b) then 6. else 0.)
            else if (max == g)
            then (b - r) / d + 2.
            else if (max == b)
            then (r - g) / d + 4.
            else h
        h / 6.
    {~h ~s ~v} : Color.color_hsv;


  of_hsv({h=h s=s v=v} : Color.color_hsv) : Color.color =
    if ( s == 0. ) //HSV from 0 to 1
    then
      vi = Int.of_float(v * 255.)
      {r=vi g=vi b=vi a= 255}
    else
      vh = h * 6.
      vh = if ( vh == 6. ) then 0. else vh //H must be < 1
      vi =Float.floor( vh ) //Or ... var_i = floor( var_h )
      v1 = v * ( 1. - s )
      v2 = v * ( 1. - s * ( vh - vi ) )
      v3 = v * ( 1. - s * ( 1. - ( vh - vi ) ) )
      (r,g,b) = match Int.of_float(vi) with
        | 0 -> (v,v3,v1)
        | 1 -> (v2,v,v1)
        | 2 -> (v1,v,v3)
        | 3 -> (v1,v2,v)
        | 4 -> (v3,v1,v)
        | _ -> (v,v1,v2)
      end
      {r = Int.of_float(r * 255.) //RGB results from 0 to 255
       g = Int.of_float(g * 255.)
       b = Int.of_float(b * 255.)
       a = 255}


  @private
  color_value(x : int) : int =
    if x < 0 then 0
    else if x > 255 then 255
    else x

  color_to_string(c:color) =
    match c.a with
      | 0 -> "transparent"
      | 255 -> "rgb({color_value(c.r)},{color_value(c.g)},{color_value(c.b)})"
      | _ -> "rgba({color_value(c.r)},{color_value(c.g)},{color_value(c.b)},{color_value(c.a)/255})"


  of_string : string -> option(color) =
    Parser.try_parse(color_parser, _)

   // FIXME: this duplicates functionality of opalang/syntax/css.trx

  color_parser = parser
    | r = color_hexa_parser -> r
    | r = color_rgb_parser -> r
    | r = color_name_parser -> r
  @private
  color_hexa_parser =
    hc1 = parser v1=Rule.hexadecimal -> v1 * 17 // hint: 16 + 1
    hc2 = parser v1=Rule.hexadecimal v2=Rule.hexadecimal -> v1*16 + v2
    parser
    | "#" r=hc2 g=hc2 b=hc2 a=hc2 -> rgba(r,g,b,a)
    | "#" r=hc2 g=hc2 b=hc2 -> rgb(r,g,b)
    | "#" r=hc1 g=hc1 b=hc1 a=hc1 -> rgba(r,g,b,a)
    | "#" r=hc1 g=hc1 b=hc1 -> rgb(r,g,b)
  @private
  color_rgb_parser = parser
    | "rgb(" Rule.ws r = Rule.byte Rule.ws "," Rule.ws g = Rule.byte Rule.ws "," Rule.ws b = Rule.byte Rule.ws ")" -> rgb(r,g,b)
    | "rgba(" Rule.ws r = Rule.byte Rule.ws "," Rule.ws g = Rule.byte Rule.ws "," Rule.ws b = Rule.byte Rule.ws "," Rule.ws a = Rule.float_0_1 Rule.ws ")" -> rgba(r,g,b,Float.to_int(a*255.))
  @private
  color_name_parser = parser
    | "yellowgreen" -> yellowgreen
    | "yellow" -> yellow
    | "whitesmoke" -> whitesmoke
    | "white" -> white
    | "wheat" -> wheat
    | "violet" -> violet
    | "turquoise" -> turquoise
    | "transparent" -> transparent
    | "tomato" -> tomato
    | "thistle" -> thistle
    | "teal" -> teal
    | "tan" -> tan
    | "steelblue" -> steelblue
    | "springgreen" -> springgreen
    | "snow" -> snow
    | "slategray" -> slategray
    | "slateblue" -> slateblue
    | "skyblue" -> skyblue
    | "silver" -> silver
    | "sienna" -> sienna
    | "seashell" -> seashell
    | "seagreen" -> seagreen
    | "sandybrown" -> sandybrown
    | "salmon" -> salmon
    | "saddlebrown" -> saddlebrown
    | "royalblue" -> royalblue
    | "rosybrown" -> rosybrown
    | "red" -> red
    | "purple" -> purple
    | "powderblue" -> powderblue
    | "plum" -> plum
    | "pink" -> pink
    | "peru" -> peru
    | "peachpuff" -> peachpuff
    | "papayawhip" -> papayawhip
    | "palevioletred" -> palevioletred
    | "paleturquoise" -> paleturquoise
    | "palegreen" -> palegreen
    | "palegoldenrod" -> palegoldenrod
    | "orchid" -> orchid
    | "orangered" -> orangered
    | "orange" -> orange
    | "olivedrab" -> olivedrab
    | "olive" -> olive
    | "oldlace" -> oldlace
    | "navy" -> navy
    | "navajowhite" -> navajowhite
    | "moccasin" -> moccasin
    | "mistyrose" -> mistyrose
    | "mintcream" -> mintcream
    | "midnightblue" -> midnightblue
    | "mediumvioletred" -> mediumvioletred
    | "mediumturquoise" -> mediumturquoise
    | "mediumspringgreen" -> mediumspringgreen
    | "mediumslateblue" -> mediumslateblue
    | "mediumseagreen" -> mediumseagreen
    | "mediumpurple" -> mediumpurple
    | "mediumorchid" -> mediumorchid
    | "mediumblue" -> mediumblue
    | "mediumaquamarine" -> mediumaquamarine
    | "maroon" -> maroon
    | "magenta" -> magenta
    | "linen" -> linen
    | "limegreen" -> limegreen
    | "lime" -> lime
    | "lightyellow" -> lightyellow
    | "lightsteelblue" -> lightsteelblue
    | "lightslategray" -> lightslategray
    | "lightskyblue" -> lightskyblue
    | "lightseagreen" -> lightseagreen
    | "lightsalmon" -> lightsalmon
    | "lightpink" -> lightpink
    | "lightgreen" -> lightgreen
    | "lightgrey" -> lightgrey
    | "lightgoldenrodyellow" -> lightgoldenrodyellow
    | "lightcyan" -> lightcyan
    | "lightcoral" -> lightcoral
    | "lightblue" -> lightblue
    | "lemonchiffon" -> lemonchiffon
    | "lawngreen" -> lawngreen
    | "lavenderblush" -> lavenderblush
    | "lavender" -> lavender
    | "khaki" -> khaki
    | "ivory" -> ivory
    | "indigo" -> indigo
    | "indianred" -> indianred
    | "hotpink" -> hotpink
    | "honeydew" -> honeydew
    | "greenyellow" -> greenyellow
    | "green" -> green
    | "gray" -> gray
    | "goldenrod" -> goldenrod
    | "gold" -> gold
    | "ghostwhite" -> ghostwhite
    | "gainsboro" -> gainsboro
    | "fuchsia" -> fuchsia
    | "forestgreen" -> forestgreen
    | "floralwhite" -> floralwhite
    | "firebrick" -> firebrick
    | "dodgerblue" -> dodgerblue
    | "dimgray" -> dimgray
    | "deepskyblue" -> deepskyblue
    | "deeppink" -> deeppink
    | "darkviolet" -> darkviolet
    | "darkturquoise" -> darkturquoise
    | "darkslategray" -> darkslategray
    | "darkslateblue" -> darkslateblue
    | "darkseagreen" -> darkseagreen
    | "darksalmon" -> darksalmon
    | "darkred" -> darkred
    | "darkorchid" -> darkorchid
    | "darkorange" -> darkorange
    | "darkolivegreen" -> darkolivegreen
    | "darkmagenta" -> darkmagenta
    | "darkkhaki" -> darkkhaki
    | "darkgreen" -> darkgreen
    | "darkgray" -> darkgray
    | "darkgoldenrod" -> darkgoldenrod
    | "darkcyan" -> darkcyan
    | "darkblue" -> darkblue
    | "cyan" -> cyan
    | "crimson" -> crimson
    | "cornsilk" -> cornsilk
    | "cornflowerblue" -> cornflowerblue
    | "coral" -> coral
    | "chocolate" -> chocolate
    | "chartreuse" -> chartreuse
    | "cadetblue" -> cadetblue
    | "burlywood" -> burlywood
    | "brown" -> brown
    | "blueviolet" -> blueviolet
    | "blue" -> blue
    | "blanchedalmond" -> blanchedalmond
    | "black" -> black
    | "bisque" -> bisque
    | "beige" -> beige
    | "azure" -> azure
    | "aquamarine" -> aquamarine
    | "aqua" -> aqua
    | "antiquewhite" -> antiquewhite
    | "aliceblue" -> aliceblue

  rgba(r, g, b, a) : color =
    r = color_value(r)
    g = color_value(g)
    b = color_value(b)
    a = color_value(a)
    {~r ~g ~b ~a}

  rgb(r, g, b) : color=
    rgba(r, g, b, 255)

  r(c:color) = c.r
  g(c:color) = c.g
  b(c:color) = c.b
  a(c:color) = c.a

  set_r(c, v) = {c:color with r = color_value(v)}
  set_g(c, v) = {c:color with g = color_value(v)}
  set_b(c, v) = {c:color with b = color_value(v)}
  set_a(c, v) = {c:color with a = color_value(v)}

  transparent = rgba(0,0,0,0)

  aliceblue = rgb(240, 248, 255)
  antiquewhite = rgb(250, 235, 215)
  aqua = rgb( 0, 255, 255)
  aquamarine = rgb(127, 255, 212)
  azure = rgb(240, 255, 255)
  beige = rgb(245, 245, 220)
  bisque = rgb(255, 228, 196)
  black = rgb( 0, 0, 0)
  blanchedalmond = rgb(255, 235, 205)
  blue = rgb( 0, 0, 255)
  blueviolet = rgb(138, 43, 226)
  brown = rgb(165, 42, 42)
  burlywood = rgb(222, 184, 135)
  cadetblue = rgb( 95, 158, 160)
  chartreuse = rgb(127, 255, 0)
  chocolate = rgb(210, 105, 30)
  coral = rgb(255, 127, 80)
  cornflowerblue = rgb(100, 149, 237)
  cornsilk = rgb(255, 248, 220)
  crimson = rgb(220, 20, 60)
  cyan = rgb( 0, 255, 255)
  darkblue = rgb( 0, 0, 139)
  darkcyan = rgb( 0, 139, 139)
  darkgoldenrod = rgb(184, 134, 11)
  darkgray = rgb(169, 169, 169)
  darkgreen = rgb( 0, 100, 0)
  darkkhaki = rgb(189, 183, 107)
  darkmagenta = rgb(139, 0, 139)
  darkolivegreen = rgb( 85, 107, 47)
  darkorange = rgb(255, 140, 0)
  darkorchid = rgb(153, 50, 204)
  darkred = rgb(139, 0, 0)
  darksalmon = rgb(233, 150, 122)
  darkseagreen = rgb(143, 188, 143)
  darkslateblue = rgb( 72, 61, 139)
  darkslategray = rgb( 47, 79, 79)
  darkturquoise = rgb( 0, 206, 209)
  darkviolet = rgb(148, 0, 211)
  deeppink = rgb(255, 20, 147)
  deepskyblue = rgb( 0, 191, 255)
  dimgray = rgb(105, 105, 105)
  dodgerblue = rgb( 30, 144, 255)
  firebrick = rgb(178, 34, 34)
  floralwhite = rgb(255, 250, 240)
  forestgreen = rgb( 34, 139, 34)
  fuchsia = rgb(255, 0, 255)
  gainsboro = rgb(220, 220, 220)
  ghostwhite = rgb(248, 248, 255)
  gold = rgb(255, 215, 0)
  goldenrod = rgb(218, 165, 32)
  gray = rgb(128, 128, 128)
  green = rgb( 0, 128, 0)
  greenyellow = rgb(173, 255, 47)
  honeydew = rgb(240, 255, 240)
  hotpink = rgb(255, 105, 180)
  indianred = rgb(205, 92, 92)
  indigo = rgb( 75, 0, 130)
  ivory = rgb(255, 255, 240)
  khaki = rgb(240, 230, 140)
  lavender = rgb(230, 230, 250)
  lavenderblush = rgb(255, 240, 245)
  lawngreen = rgb(124, 252, 0)
  lemonchiffon = rgb(255, 250, 205)
  lightblue = rgb(173, 216, 230)
  lightcoral = rgb(240, 128, 128)
  lightcyan = rgb(224, 255, 255)
  lightgoldenrodyellow = rgb(250, 250, 210)
  lightgrey = rgb(211, 211, 211)
  lightgreen = rgb(144, 238, 144)
  lightpink = rgb(255, 182, 193)
  lightsalmon = rgb(255, 160, 122)
  lightseagreen = rgb( 32, 178, 170)
  lightskyblue = rgb(135, 206, 250)
  lightslategray = rgb(119, 136, 153)
  lightsteelblue = rgb(176, 196, 222)
  lightyellow = rgb(255, 255, 224)
  lime = rgb( 0, 255, 0)
  limegreen = rgb( 50, 205, 50)
  linen = rgb(250, 240, 230)
  magenta = rgb(255, 0, 255)
  maroon = rgb(128, 0, 0)
  mediumaquamarine = rgb(102, 205, 170)
  mediumblue = rgb( 0, 0, 205)
  mediumorchid = rgb(186, 85, 211)
  mediumpurple = rgb(147, 112, 216)
  mediumseagreen = rgb( 60, 179, 113)
  mediumslateblue = rgb(123, 104, 238)
  mediumspringgreen = rgb( 0, 250, 154)
  mediumturquoise = rgb( 72, 209, 204)
  mediumvioletred = rgb(199, 21, 133)
  midnightblue = rgb( 25, 25, 112)
  mintcream = rgb(245, 255, 250)
  mistyrose = rgb(255, 228, 225)
  moccasin = rgb(255, 228, 181)
  navajowhite = rgb(255, 222, 173)
  navy = rgb( 0, 0, 128)
  oldlace = rgb(253, 245, 230)
  olive = rgb(128, 128, 0)
  olivedrab = rgb(107, 142, 35)
  orange = rgb(255, 165, 0)
  orangered = rgb(255, 69, 0)
  orchid = rgb(218, 112, 214)
  palegoldenrod = rgb(238, 232, 170)
  palegreen = rgb(152, 251, 152)
  paleturquoise = rgb(175, 238, 238)
  palevioletred = rgb(216, 112, 147)
  papayawhip = rgb(255, 239, 213)
  peachpuff = rgb(255, 218, 185)
  peru = rgb(205, 133, 63)
  pink = rgb(255, 192, 203)
  plum = rgb(221, 160, 221)
  powderblue = rgb(176, 224, 230)
  purple = rgb(128, 0, 128)
  red = rgb(255, 0, 0)
  rosybrown = rgb(188, 143, 143)
  royalblue = rgb( 65, 105, 225)
  saddlebrown = rgb(139, 69, 19)
  salmon = rgb(250, 128, 114)
  sandybrown = rgb(244, 164, 96)
  seagreen = rgb( 46, 139, 87)
  seashell = rgb(255, 245, 238)
  sienna = rgb(160, 82, 45)
  silver = rgb(192, 192, 192)
  skyblue = rgb(135, 206, 235)
  slateblue = rgb(106, 90, 205)
  slategray = rgb(112, 128, 144)
  snow = rgb(255, 250, 250)
  springgreen = rgb( 0, 255, 127)
  steelblue = rgb( 70, 130, 180)
  tan = rgb(210, 180, 140)
  teal = rgb( 0, 128, 128)
  thistle = rgb(216, 191, 216)
  tomato = rgb(255, 99, 71)
  turquoise = rgb( 64, 224, 208)
  violet = rgb(238, 130, 238)
  wheat = rgb(245, 222, 179)
  white = rgb(255, 255, 255)
  whitesmoke = rgb(245, 245, 245)
  yellow = rgb(255, 255, 0)
  yellowgreen = rgb(154, 205, 50)





}}
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