module BannerCharCommand

# File lib/banner_char_command.rb, line 129
def channel_allowed?(channel)
  !channel.nil? && !channel.to_s.strip.empty?
end

# File lib/banner_char_command.rb, line 134
def channel_error
  { error: true, reply: BannerFontReport.pm_error, multiline: false }
end

# File lib/banner_char_command.rb, line 139
def error_result(message)
  { error: true, reply: BannerFontReport.error(message), multiline: false }
end

# File lib/banner_char_command.rb, line 77
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], parsed[:width], 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_char_command.rb, line 113
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.char_reset(char), multiline: false }
end

# File lib/banner_char_command.rb, line 107
def handle_set(letter, rows, width, network:, channel:, store:)
  char = BannerFontStore.normalize_letter(letter)
  BannerFontStore.set_glyph!(char, rows, width: width, network: network, channel: channel, store: store)
  { error: false, reply: BannerFontReport.char_set(char, width: width), multiline: false }
end

# File lib/banner_char_command.rb, line 97
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[" "]
  width = BannerFont.glyph_width(rows)
  { error: false, reply: BannerFontReport.char_show(char, rows, width: width), multiline: true }
rescue ArgumentError => e
  error_result(e.message)
end

# File lib/banner_char_command.rb, line 23
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.length == 2 && parts[1].casecmp("reset").zero?
    return { action: :reset, letter: letter }
  end

  if parts.length >= 3 && parts[0].match?(/\A\d+\z/)
    width = parts[0].to_i
    set_letter = parts[1].to_s.upcase
    joined = parts[2..].join(" ")
    return { error: width_error(width) } unless valid_width?(width)

    begin
      rows = split_joined_ascii(joined, width)
    rescue ArgumentError => e
      return { error: e.message }
    end

    return {
      action: :set,
      letter: set_letter,
      width: width,
      rows: rows
    }
  end

  { error: usage_message }
end

# File lib/banner_char_command.rb, line 62
def split_joined_ascii(text, width)
  joined = text.to_s.gsub(/\s+/, "")
  length = joined.length
  expected_three = 3 * width
  expected_four = 4 * width

  unless length == expected_three || length == expected_four
    raise ArgumentError,
          "Joined ASCII must be exactly #{expected_three} or #{expected_four} characters (got #{length})."
  end

  pattern = /.{#{width}}/
  chunks = joined.scan(pattern)
end

# File lib/banner_char_command.rb, line 19
def usage_message
  "Usage: !bannerchar <letter> | !bannerchar <letter> reset | !bannerchar <width> <letter> <joined-ascii>"
end

# File lib/banner_char_command.rb, line 119
def valid_width?(width)
  width >= MIN_WIDTH && width <= MAX_WIDTH
end

# File lib/banner_char_command.rb, line 124
def width_error(width)
  "Width must be #{MIN_WIDTH}–#{MAX_WIDTH} (got #{width})."
end