require "letter_avatar/version"
require "letter_avatar/avatar"

module LetterAvatar
  
  mattr_accessor :cache_base_path
  @@cache_base_path = nil
  
  def self.setup(&block)
    yield(self)
  end

  def self.resize(from, to, width, height)
    # NOTE: ORDER is important!
    instructions = %W{
      #{from}
      -background transparent
      -gravity center
      -thumbnail #{width}x#{height}^
      -extent #{width}x#{height}
      -interpolate bicubic
      -unsharp 2x0.5+0.7+0
      -quality 98
      #{to}
    }.join(" ")

    `convert #{instructions}`

    if $?.exitstatus == 0
      ImageOptim.new.optimize_image(to) rescue nil
      true
    else
      false
    end
  end
  
  def generate(username, size)
    Avatar.generate(username, size)
  end
  
  # palette of optimally disctinct colors
    # cf. http://tools.medialab.sciences-po.fr/iwanthue/index.php
    # parameters used:
    #   - H: 0 - 360
    #   - C: 0 - 2
    #   - L: 0.75 - 1.5
    COLORS = [[198,125,40],
        [61,155,243],
        [74,243,75],
        [238,89,166],
        [52,240,224],
        [177,156,155],
        [240,120,145],
        [111,154,78],
        [237,179,245],
        [237,101,95],
        [89,239,155],
        [43,254,70],
        [163,212,245],
        [65,152,142],
        [165,135,246],
        [181,166,38],
        [187,229,206],
        [77,164,25],
        [179,246,101],
        [234,93,37],
        [225,155,115],
        [142,140,188],
        [223,120,140],
        [249,174,27],
        [244,117,225],
        [137,141,102],
        [75,191,146],
        [188,239,142],
        [164,199,145],
        [173,120,149],
        [59,195,89],
        [222,198,220],
        [68,145,187],
        [236,204,179],
        [159,195,72],
        [188,121,189],
        [166,160,85],
        [181,233,37],
        [236,177,85],
        [121,147,160],
        [234,218,110],
        [241,157,191],
        [62,200,234],
        [133,243,34],
        [88,149,110],
        [59,228,248],
        [183,119,118],
        [251,195,45],
        [113,196,122],
        [197,115,70],
        [80,175,187],
        [103,231,238],
        [240,72,133],
        [228,149,241],
        [180,188,159],
        [172,132,85],
        [180,135,251],
        [236,194,58],
        [217,176,109],
        [88,244,199],
        [186,157,239],
        [113,230,96],
        [206,115,165],
        [244,178,163],
        [230,139,26],
        [241,125,89],
        [83,160,66],
        [107,190,166],
        [197,161,210],
        [198,203,245],
        [238,117,19],
        [228,119,116],
        [131,156,41],
        [145,178,168],
        [139,170,220],
        [233,95,125],
        [87,178,230],
        [157,200,119],
        [237,140,76],
        [229,185,186],
        [144,206,212],
        [236,209,158],
        [185,189,79],
        [34,208,66],
        [84,238,129],
        [133,140,134],
        [67,157,94],
        [168,179,25],
        [140,145,240],
        [151,241,125],
        [67,162,107],
        [200,156,21],
        [169,173,189],
        [226,116,189],
        [133,231,191],
        [194,161,63],
        [241,77,99],
        [241,217,53],
        [123,204,105],
        [210,201,119],
        [229,108,155],
        [240,91,72],
        [187,115,210],
        [240,163,100],
        [178,217,57],
        [179,135,116],
        [204,211,24],
        [186,135,57],
        [223,176,135],
        [204,148,151],
        [116,223,50],
        [95,195,46],
        [123,160,236],
        [181,172,131],
        [142,220,202],
        [240,140,112],
        [172,145,164],
        [228,124,45],
        [135,151,243],
        [42,205,125],
        [192,233,116],
        [119,170,114],
        [158,138,26],
        [73,190,183],
        [185,229,243],
        [227,107,55],
        [196,205,202],
        [132,143,60],
        [233,192,237],
        [62,150,220],
        [205,201,141],
        [106,140,190],
        [161,131,205],
        [135,134,158],
        [198,139,81],
        [115,171,32],
        [101,181,67],
        [149,137,119],
        [37,142,183],
        [183,130,175],
        [168,125,133],
        [124,142,87],
        [236,156,171],
        [232,194,91],
        [219,200,69],
        [144,219,34],
        [219,95,187],
        [145,154,217],
        [165,185,100],
        [127,238,163],
        [224,178,198],
        [119,153,120],
        [124,212,92],
        [172,161,105],
        [231,155,135],
        [157,132,101],
        [122,185,146],
        [53,166,51],
        [70,163,90],
        [150,190,213],
        [210,107,60],
        [166,152,185],
        [159,194,159],
        [39,141,222],
        [202,176,161],
        [95,140,229],
        [168,142,87],
        [93,170,203],
        [159,142,54],
        [14,168,39],
        [94,150,149],
        [187,206,136],
        [157,224,166],
        [235,158,208],
        [109,232,216],
        [141,201,87],
        [208,124,118],
        [142,125,214],
        [19,237,174],
        [72,219,41],
        [234,102,111],
        [168,142,79],
        [188,135,35],
        [95,155,143],
        [148,173,116],
        [223,112,95],
        [228,128,236],
        [206,114,54],
        [195,119,88],
        [235,140,94],
        [235,202,125],
        [233,155,153],
        [214,214,238],
        [246,200,35],
        [151,125,171],
        [132,145,172],
        [131,142,118],
        [199,126,150],
        [61,162,123],
        [58,176,151],
        [215,141,69],
        [225,154,220],
        [220,77,167],
        [233,161,64],
        [130,221,137],
        [81,191,129],
        [169,162,140],
        [174,177,222],
        [236,174,47],
        [233,188,180],
        [69,222,172],
        [71,232,93],
        [118,211,238],
        [157,224,83],
        [218,105,73],
        [126,169,36]]

end