module Emoji

# File lib/emoji.rb, line 114
def self.alt_tag_for_moji(moji)
  return moji unless use_plaintext_alt_tags
  emoji = index.find_by_moji(moji)
  emoji['name']
end

# File lib/emoji.rb, line 22
def self.asset_host
  @asset_host || 'http://localhost:3000'
end

# File lib/emoji.rb, line 26
def self.asset_host=(asset_host)
  @asset_host = parse_and_validate_asset_host(asset_host)
end

# File lib/emoji.rb, line 97
def self.asset_host_for_asset(asset_path)
  return asset_host if asset_host.kind_of?(String)

  asset_host.call(asset_path)
end

# File lib/emoji.rb, line 81
def self.asset_path
  @asset_path || '/'
end

# File lib/emoji.rb, line 85
def self.asset_path=(path)
  @asset_path = path
end

# File lib/emoji.rb, line 143
def self.escape_html(string)
  @escaper.escape_html(string)
end

# File lib/emoji.rb, line 73
def self.extract_port_string(uri)
  return nil unless uri.port
  return nil if uri.port == 80 && uri.scheme == 'http'
  return nil if uri.port == 443 && uri.scheme == 'https'

  return ":#{uri.port}"
end

# File lib/emoji.rb, line 61
def self.extract_uri_scheme_string(asset_host_spec, uri)
  # Special Case for Protocol Relative Scheme: //hostname.com/
  if asset_host_spec.size >= 2 && asset_host_spec[0..1] == '//'
    return '//'
  end

  # Extract Protocol from asset_host_spec URI or default to HTTP
  scheme = uri.scheme || 'http'

  "#{ scheme }://"
end

# File lib/emoji.rb, line 103
def self.image_url_for_name(name)
  path = "#{ File.join(asset_path, name) }.png"
  host = asset_host_for_asset(path)
  "#{host}#{path}"
end

# File lib/emoji.rb, line 109
def self.image_url_for_unicode_moji(moji)
  emoji = index.find_by_moji(moji)
  image_url_for_name(emoji['name'])
end

# File lib/emoji.rb, line 147
def self.index
  @index ||= Index.new
end

# File lib/emoji.rb, line 30
def self.parse_and_validate_asset_host(asset_host_spec)
  return '' unless asset_host_spec
  return asset_host_spec if asset_host_spec.respond_to?(:call)
  unless asset_host_spec.kind_of?(String)
    raise 'Invalid Emoji.asset_host, should be a hostname or URL prefix'
  end
  return '' unless asset_host_spec.size >= 1

  # Special Case for 'hostname:port' style URIs, not parse properly by URI.parse
  if asset_host_spec.match(/^[^:]+:\d+$/)
    components = asset_host_spec.split(':')
    scheme_string = 'http://'
    hostname = components.first
    port_string = ":#{components.last}"
  else
    uri = parse_asset_host_uri(asset_host_spec)
    scheme_string = extract_uri_scheme_string(asset_host_spec, uri)
    hostname = uri.hostname || uri.path
    port_string = extract_port_string(uri)
  end
    
   "#{ scheme_string }#{ hostname }#{ port_string }"
end

# File lib/emoji.rb, line 54
def self.parse_asset_host_uri(asset_host_spec)
  URI.parse(asset_host_spec)

  rescue URI::InvalidURIError
    raise 'Invalid Emoji.asset_host, should be a hostname or URL prefix'
end

# File lib/emoji.rb, line 120
def self.replace_unicode_moji_with_images(string)
  return string unless string
  unless string.match(index.unicode_moji_regex)
    return safe_string(string)
  end

  safe_string = safe_string(string.dup)
  safe_string.gsub!(index.unicode_moji_regex) do |moji|
    %Q{<img alt="#{alt_tag_for_moji(moji)}" class="emoji" src="#{ image_url_for_unicode_moji(moji) }">}
  end
  safe_string = safe_string.html_safe if safe_string.respond_to?(:html_safe)

  safe_string
end

# File lib/emoji.rb, line 135
def self.safe_string(string)
  if string.respond_to?(:html_safe?) && string.html_safe?
    string
  else
    escape_html(string)
  end
end

# File lib/emoji.rb, line 89
def self.use_plaintext_alt_tags
  @use_plaintext_alt_tags || false
end

# File lib/emoji.rb, line 93
def self.use_plaintext_alt_tags=(bool)
  @use_plaintext_alt_tags = bool
end