#!/usr/bin/env ruby

gem_name, *gem_ver_reqs = 'gemoji', '~> 3.0.0'
gdep = Gem::Dependency.new(gem_name, *gem_ver_reqs)
found_gspec = gdep.matching_specs.max_by(&:version)

if !found_gspec
    abort("ERROR: gemoji #{gdep.requirement} is required: `gem install gemoji -v '#{gdep.requirement}'`")
end

puts "using gemoji #{found_gspec.version}"

gem 'gemoji', found_gspec.version
require 'emoji'
require 'fileutils'
require 'json'

emoji_path = File.join(File.dirname(__FILE__), 'images', 'emoji')
if File.directory? emoji_path
    FileUtils.remove_dir emoji_path
end
Dir.mkdir emoji_path

Emoji.create('mattermost')
FileUtils.cp(File.join(File.dirname(__FILE__), 'images', 'icon64x64.png'), File.join(emoji_path, 'mattermost.png'))

custom_aliases = {
    "ca" => "canada",
    "pk" => "pakistan",
    "za" => "south_africa"
}
custom_aliases.each do |custom, original|
    emoji = Emoji.find_by_alias original

    Emoji.edit_emoji(emoji) do |char|
      char.add_alias custom
    end
end

blacklist = ['basecamp', 'basecampy']

categories = []

File.open(File.join(File.dirname(__FILE__), 'utils', 'emoji.jsx'), 'w') do |f|
    emojis = []
    emoji_indices_by_alias = []
    emoji_indices_by_unicode = []
    emoji_indices_by_category = []

    Emoji.all.each do |emoji|
        if blacklist.include? emoji.name
            next
        end
        emoji.aliases.each do |emoji_alias|
            emoji_indices_by_alias << [emoji_alias, emojis.length]
        end
        emoji.unicode_aliases.each do |unicode_alias|
            emoji_indices_by_unicode << [emoji.class.hex_inspect(unicode_alias), emojis.length]
        end
        category = emoji.category ? emoji.category.downcase : 'custom'
        if !categories.include? category
            categories << category
            emoji_indices_by_category << [category, []]
        end
        emoji_indices_by_category[categories.index(category)][1] << emojis.length
        filename = emoji.custom? ? emoji.name : emoji.hex_inspect
        emojis << {
            'aliases' => emoji.aliases,
            'filename' => filename,
            'category' => category,
        }
        emoji.image_filename = filename + '.png'
    end

    f.write("// This file is automatically generated via `make emojis`. Do not modify it manually.\n\n")
    f.write("/* eslint-disable */\n\n")
    f.write("export const Emojis = #{JSON.generate emojis};\n\n")
    f.write("export const EmojiIndicesByAlias = new Map(#{JSON.generate emoji_indices_by_alias});\n\n")
    f.write("export const EmojiIndicesByUnicode = new Map(#{JSON.generate emoji_indices_by_unicode});\n\n")
    f.write("export const CategoryNames = #{JSON.generate categories};\n\n")
    f.write("export const EmojiIndicesByCategory = new Map(#{JSON.generate emoji_indices_by_category});\n\n")
    f.write("/* eslint-enable */")

    puts "wrote #{emojis.length} emojis to utils/emoji.jsx"
end

require 'emoji/extractor'

Emoji::Extractor.new(64, emoji_path).extract!

Dir["#{Emoji.images_path}/*.png"].each do |png|
    if blacklist.include? File.basename(png, '.png')
        next
    end
    FileUtils.cp(png, File.join(emoji_path, File.basename(png)))
end

puts "images written to images/emoji"

### Spritesheet Generation ###

['sprite-factory', 'chunky_png'].each do |name|
    gdep = Gem::Dependency.new(name, '>1.0')
    found_gspec = gdep.matching_specs.max_by(&:version)

    if !found_gspec
        abort("ERROR: #{name} is required for spritesheet generation: `gem install #{name}'`")
    end
end

require 'sprite_factory'

css_rules = [
    '@charset "UTF-8";',
    '.emojisprite-preview {',
    '    @include transform(scale(.55));',
    '    background-repeat: no-repeat;',
    '    cursor: pointer;',
    '    height: 64px;',
    '    max-width: none;',
    '    transform-origin: 0 0;',
    '    width: 64px;',
    '    padding: 0 10px 0 0;',
    '}',
    '.emojisprite {',
    '    @include transform(scale(.35));',
    '    background-repeat: no-repeat;',
    '    border-radius: 18px;',
    '    cursor: pointer;',
    '    height: 64px;',
    '    max-width: none;',
    '    transform-origin: 0 0;',
    '    width: 64px;',
    '}',
    '.emojisprite-loading {',
    '    background-image: none !important;',
    '    @include transform(scale(.35));',
    '    background-repeat: no-repeat;',
    '    border-radius: 18px;',
    '    cursor: pointer;',
    '    height: 64px;',
    '    max-width: none;',
    '    transform-origin: 0 0;',
    '    width: 64px;',
    '}',
]

spritesheet_path = File.join(File.dirname(__FILE__), 'images', 'emoji-sheets')
if File.directory? spritesheet_path
    FileUtils.remove_dir spritesheet_path
end
Dir.mkdir spritesheet_path

categories.each do |category|
    count = 0

    tmp_directory = File.join(spritesheet_path, 'temp')
    Dir.mkdir tmp_directory
    Emoji.all.each do |emoji|
        if blacklist.include? emoji.name
            next
        end
        if category == (emoji.category ? emoji.category.downcase : 'custom')
            FileUtils.cp(File.join(emoji_path, emoji.image_filename), File.join(tmp_directory, emoji.image_filename))
            count += 1
        end
    end

    css_rules << ".emoji-category-#{category} { background-image: url('../images/emoji-sheets/#{category}.png'); }"

    SpriteFactory.run!(
        tmp_directory,
        :layout => :packed,
        :library => 'chunkypng',
        :output_image => File.join(spritesheet_path, category + '.png'),
        :nocomments => true,
        :nocss => true,
    ) do |images|
        images.each do |name, image|
            if image[:cssw] != 64 || image[:cssh] != 64
                css_rules << ".emoji-#{name} { background-position: -#{image[:cssx]}px -#{image[:cssy]}px; width: #{image[:cssw]}px; height: #{image[:cssh]}px; }"
            else
                css_rules << ".emoji-#{name} { background-position: -#{image[:cssx]}px -#{image[:cssy]}px; }"
            end
        end
    end

    FileUtils.remove_dir tmp_directory

    puts "#{count} emojis written to images/emoji-sheets/#{category}.png"
end

File.write(File.join(File.dirname(__FILE__), 'sass', 'components', '_emojisprite.scss'), css_rules.join("\n"))
puts "sprite stylesheet written to sass/components/_emojisprite.scss"