module BannerLetterCommand

# File lib/banner_letter_command.rb, line 86
def channel_allowed?(channel)
  !channel.nil? && !channel.to_s.strip.empty?
end

# File lib/banner_letter_command.rb, line 91
def channel_error
  { error: true, reply: BannerFontReport.pm_error, multiline: false }
end

# File lib/banner_letter_command.rb, line 96
def error_result(message)
  { error: true, reply: BannerFontReport.error(message), multiline: false }
end

# File lib/banner_letter_command.rb, line 45
def handle(args, network:, channel:, store: RabbotDb)
  return channel_error unless channel_allowed?(channel)

  parsed = parse(args)
  return error_result(parsed[:error]) if parsed[:error]

  case parsed[:action]
  when :show
    handle_show(parsed[:letter], network: network, channel: channel, store: store)
  when :set
    handle_set(parsed[:letter], parsed[:rows], network: network, channel: channel, store: store)
  when :reset
    handle_reset(parsed[:letter], network: network, channel: channel, store: store)
  else
    error_result(usage_message)
  end
rescue ArgumentError => e
  error_result(e.message)
end

# File lib/banner_letter_command.rb, line 80
def handle_reset(letter, network:, channel:, store:)
  char = BannerFontStore.normalize_letter(letter)
  BannerFontStore.reset_glyph!(char, network: network, channel: channel, store: store)
  { error: false, reply: BannerFontReport.letter_reset(char), multiline: false }
end

# File lib/banner_letter_command.rb, line 74
def handle_set(letter, rows, network:, channel:, store:)
  char = BannerFontStore.normalize_letter(letter)
  BannerFontStore.set_glyph!(char, rows, network: network, channel: channel, store: store)
  { error: false, reply: BannerFontReport.letter_set(char), multiline: false }
end

# File lib/banner_letter_command.rb, line 65
def handle_show(letter, network:, channel:, store:)
  char = BannerFontStore.normalize_letter(letter)
  glyphs = BannerFontStore.effective_glyphs(network: network, channel: channel, store: store)
  rows = glyphs[char] || BannerFont::GLYPHS[char] || BannerFont::GLYPHS[" "]
  { error: false, reply: BannerFontReport.letter_show(char, rows), multiline: true }
rescue ArgumentError => e
  error_result(e.message)
end

# File lib/banner_letter_command.rb, line 20
def parse(args)
  text = args.to_s.strip
  return { error: usage_message } if text.empty?

  parts = text.split(/\s+/)
  letter = parts[0].to_s.upcase
  return { error: usage_message } if letter.empty?

  if parts.length == 1
    return { action: :show, letter: letter }
  end

  if parts[1].casecmp("reset").zero?
    return { action: :reset, letter: letter }
  end

  return { error: usage_message } unless parts.length == BannerFont::HEIGHT + 1

  {
    action: :set,
    letter: letter,
    rows: parts[1, BannerFont::HEIGHT]
  }
end

# File lib/banner_letter_command.rb, line 16
def usage_message
  "Usage: !bannerletter <letter> | !bannerletter <letter> <row1> <row2> <row3> <row4> | !bannerletter <letter> reset"
end