class Chamomile::TextArea

# File lib/chamomile/components/text_area.rb, line 11
def initialize(width: 40, height: 6, key_map: DEFAULT_KEY_MAP,
               prompt: "", placeholder: "", char_limit: 0,
               show_line_numbers: false, end_of_buffer_char: "~")
  @width = width
  @height = height
  @key_map = key_map
  @prompt = prompt
  @placeholder = placeholder
  @char_limit = char_limit
  @show_line_numbers = show_line_numbers
  @end_of_buffer_char = end_of_buffer_char
  @max_height = 0
  @max_width = 0
  @lines = [""]
  @row = 0
  @col = 0
  @offset = 0
  @focused = false
  @last_char_offset = 0
end

# File lib/chamomile/components/text_area.rb, line 37
def blur
  @focused = false
  self
end

# File lib/chamomile/components/text_area.rb, line 83
def cursor_down
  return if @row >= @lines.length - 1

  @row += 1
  @col = [@last_char_offset, @lines[@row].length].min
  clamp_offset
end

# File lib/chamomile/components/text_area.rb, line 96
def cursor_end
  @col = @lines[@row].length
  @last_char_offset = @col
end

# File lib/chamomile/components/text_area.rb, line 91
def cursor_start
  @col = 0
  @last_char_offset = @col
end

# File lib/chamomile/components/text_area.rb, line 75
def cursor_up
  return if @row.zero?

  @row -= 1
  @col = [@last_char_offset, @lines[@row].length].min
  clamp_offset
end

# File lib/chamomile/components/text_area.rb, line 69
def display_height
  return @height unless @max_height.positive?

  [@lines.length, @height].max.clamp(@height, @max_height)
end

# File lib/chamomile/components/text_area.rb, line 32
def focus
  @focused = true
  self
end

# File lib/chamomile/components/text_area.rb, line 42
def focused?
  @focused
end

# File lib/chamomile/components/text_area.rb, line 171
def handle(msg)
  return unless @focused

  case msg
  when Chamomile::KeyEvent
    handle_key(msg)
  when Chamomile::PasteEvent
    handle_paste(msg)
  end

  nil
end

# File lib/chamomile/components/text_area.rb, line 152
def insert_rune(c)
  return if c == "\n"

  return if @char_limit.positive? && length >= @char_limit

  line = @lines[@row]
  @lines[@row] = line[0, @col].to_s + c + line[@col..].to_s
  @col += 1
  @last_char_offset = @col
end

# File lib/chamomile/components/text_area.rb, line 142
def insert_string(s)
  s.each_char do |c|
    if c == "\n"
      split_line
    else
      insert_rune(c)
    end
  end
end

# File lib/chamomile/components/text_area.rb, line 65
def length
  value.length
end

# File lib/chamomile/components/text_area.rb, line 61
def line_count
  @lines.length
end

# File lib/chamomile/components/text_area.rb, line 101
def move_to_begin
  @row = 0
  @col = 0
  @last_char_offset = 0
  clamp_offset
end

# File lib/chamomile/components/text_area.rb, line 108
def move_to_end
  @row = @lines.length - 1
  @col = @lines[@row].length
  @last_char_offset = @col
  clamp_offset
end

# File lib/chamomile/components/text_area.rb, line 122
def page_down
  rows = display_height
  @row = [@row + rows, @lines.length - 1].min
  @col = [@last_char_offset, @lines[@row].length].min
  clamp_offset
end

# File lib/chamomile/components/text_area.rb, line 115
def page_up
  rows = display_height
  @row = [@row - rows, 0].max
  @col = [@last_char_offset, @lines[@row].length].min
  clamp_offset
end

# File lib/chamomile/components/text_area.rb, line 163
def reset
  @lines = [""]
  @row = 0
  @col = 0
  @offset = 0
  @last_char_offset = 0
end

# File lib/chamomile/components/text_area.rb, line 46
def value
  @lines.join("\n")
end

# File lib/chamomile/components/text_area.rb, line 50
def value=(s)
  s = s.to_s
  s = s[0, @char_limit] if @char_limit.positive? && s.length > @char_limit
  @lines = s.split("\n", -1)
  @lines = [""] if @lines.empty?
  @row = @row.clamp(0, @lines.length - 1)
  @col = @col.clamp(0, @lines[@row].length)
  @last_char_offset = @col
  clamp_offset
end

# File lib/chamomile/components/text_area.rb, line 186
def view
  return "#{@prompt}#{@placeholder}" if @lines == [""] && !@placeholder.empty? && !@focused

  view_h = display_height
  visible_lines = @lines[@offset, view_h] || []
  rendered = visible_lines.each_with_index.map do |line, i|
    actual_row = @offset + i
    render_line(line, actual_row)
  end

  # Pad with end-of-buffer chars
  while rendered.length < view_h
    prefix = @show_line_numbers ? "#{" " * gutter_width} " : ""
    rendered << "#{@prompt}#{prefix}#{@end_of_buffer_char}"
  end

  rendered.join("\n")
end

# File lib/chamomile/components/text_area.rb, line 129
def word
  line = @lines[@row]
  return "" if line.empty? || @col >= line.length || line[@col] =~ /\s/

  left = @col
  left -= 1 while left.positive? && line[left - 1] =~ /\S/

  right = @col
  right += 1 while right < line.length && line[right] =~ /\S/

  line[left...right]
end