class Reline::Windows

# File reline/windows.rb, line 257
def self.check_input_event
  num_of_events = 0.chr * 8
  while @@output_buf.empty?
    Reline.core.line_editor.resize
    if @@WaitForSingleObject.(@@hConsoleInputHandle, 100) != 0 # max 0.1 sec
      # prevent for background consolemode change
      @@legacy_console = (getconsolemode() & ENABLE_VIRTUAL_TERMINAL_PROCESSING == 0)
      next
    end
    next if @@GetNumberOfConsoleInputEvents.(@@hConsoleInputHandle, num_of_events) == 0 or num_of_events.unpack1('L') == 0
    input_records = 0.chr * 20 * 80
    read_event = 0.chr * 4
    if @@ReadConsoleInputW.(@@hConsoleInputHandle, input_records, 80, read_event) != 0
      read_events = read_event.unpack1('L')
      0.upto(read_events) do |idx|
        input_record = input_records[idx * 20, 20]
        event = input_record[0, 2].unpack1('s*')
        case event
        when WINDOW_BUFFER_SIZE_EVENT
          @@winch_handler.()
        when KEY_EVENT
          key_down = input_record[4, 4].unpack1('l*')
          repeat_count = input_record[8, 2].unpack1('s*')
          virtual_key_code = input_record[10, 2].unpack1('s*')
          virtual_scan_code = input_record[12, 2].unpack1('s*')
          char_code = input_record[14, 2].unpack1('S*')
          control_key_state = input_record[16, 2].unpack1('S*')
          is_key_down = key_down.zero? ? false : true
          if is_key_down
            process_key_event(repeat_count, virtual_key_code, virtual_scan_code, char_code, control_key_state)
          end
        end
      end
    end
  end
end

# File reline/windows.rb, line 417
def self.clear_screen
  if @@legacy_console
    return unless csbi = get_console_screen_buffer_info
    buffer_width, _buffer_lines, attributes, window_top, window_bottom = csbi.unpack('ss@8S@12sx2s')
    fill_length = buffer_width * (window_bottom - window_top + 1)
    screen_topleft = window_top * 65536
    written = 0.chr * 4
    @@FillConsoleOutputCharacter.call(@@hConsoleHandle, 0x20, fill_length, screen_topleft, written)
    @@FillConsoleOutputAttribute.call(@@hConsoleHandle, attributes, fill_length, screen_topleft, written)
    @@SetConsoleCursorPosition.call(@@hConsoleHandle, screen_topleft)
  else
    @@output.write "\e[2J" "\e[H"
  end
end

# File reline/windows.rb, line 346
def self.cursor_pos
  unless csbi = get_console_screen_buffer_info
    return Reline::CursorPos.new(0, 0)
  end
  x = csbi[4, 2].unpack1('s')
  y = csbi[6, 2].unpack1('s')
  Reline::CursorPos.new(x, y)
end

# File reline/windows.rb, line 459
def self.deprep(otio)
  # do nothing
end

# File reline/windows.rb, line 311
def self.empty_buffer?
  if not @@output_buf.empty?
    false
  elsif @@kbhit.call == 0
    true
  else
    false
  end
end

# File reline/windows.rb, line 4
def self.encoding
  Encoding::UTF_8
end

# File reline/windows.rb, line 381
def self.erase_after_cursor
  return unless csbi = get_console_screen_buffer_info
  attributes = csbi[8, 2].unpack1('S')
  cursor = csbi[4, 4].unpack1('L')
  written = 0.chr * 4
  @@FillConsoleOutputCharacter.call(@@hConsoleHandle, 0x20, get_screen_size.last - cursor_pos.x, cursor, written)
  @@FillConsoleOutputAttribute.call(@@hConsoleHandle, attributes, get_screen_size.last - cursor_pos.x, cursor, written)
end

# File reline/windows.rb, line 321
def self.get_console_screen_buffer_info
  # CONSOLE_SCREEN_BUFFER_INFO
  # [ 0,2] dwSize.X
  # [ 2,2] dwSize.Y
  # [ 4,2] dwCursorPositions.X
  # [ 6,2] dwCursorPositions.Y
  # [ 8,2] wAttributes
  # [10,2] srWindow.Left
  # [12,2] srWindow.Top
  # [14,2] srWindow.Right
  # [16,2] srWindow.Bottom
  # [18,2] dwMaximumWindowSize.X
  # [20,2] dwMaximumWindowSize.Y
  csbi = 0.chr * 22
  return if @@GetConsoleScreenBufferInfo.call(@@hConsoleHandle, csbi) == 0
  csbi
end

# File reline/windows.rb, line 339
def self.get_screen_size
  unless csbi = get_console_screen_buffer_info
    return [1, 1]
  end
  csbi[0, 4].unpack('SS').reverse
end

# File reline/windows.rb, line 298
def self.getc(_timeout_second)
  check_input_event
  @@output_buf.shift
end

# File reline/windows.rb, line 436
def self.hide_cursor
  size = 100
  visible = 0 # 0 means false
  cursor_info = [size, visible].pack('Li')
  @@SetConsoleCursorInfo.call(@@hConsoleHandle, cursor_info)
end

# File reline/windows.rb, line 307
def self.in_pasting?
  not self.empty_buffer?
end

# File reline/windows.rb, line 355
def self.move_cursor_column(val)
  @@SetConsoleCursorPosition.call(@@hConsoleHandle, cursor_pos.y * 65536 + val)
end

# File reline/windows.rb, line 369
def self.move_cursor_down(val)
  if val > 0
    return unless csbi = get_console_screen_buffer_info
    screen_height = get_screen_size.first
    y = cursor_pos.y + val
    y = screen_height - 1 if y > (screen_height - 1)
    @@SetConsoleCursorPosition.call(@@hConsoleHandle, (cursor_pos.y + val) * 65536 + cursor_pos.x)
  elsif val < 0
    move_cursor_up(-val)
  end
end

# File reline/windows.rb, line 359
def self.move_cursor_up(val)
  if val > 0
    y = cursor_pos.y - val
    y = 0 if y < 0
    @@SetConsoleCursorPosition.call(@@hConsoleHandle, y * 65536 + cursor_pos.x)
  elsif val < 0
    move_cursor_down(-val)
  end
end

# File reline/windows.rb, line 173
def self.msys_tty?(io = @@hConsoleInputHandle)
  # check if fd is a pipe
  if @@GetFileType.call(io) != FILE_TYPE_PIPE
    return false
  end

  bufsize = 1024
  p_buffer = "\0" * bufsize
  res = @@GetFileInformationByHandleEx.call(io, FILE_NAME_INFO, p_buffer, bufsize - 2)
  return false if res == 0

  # get pipe name: p_buffer layout is:
  #   struct _FILE_NAME_INFO {
  #     DWORD FileNameLength;
  #     WCHAR FileName[1];
  #   } FILE_NAME_INFO
  len = p_buffer[0, 4].unpack1("L")
  name = p_buffer[4, len].encode(Encoding::UTF_8, Encoding::UTF_16LE, invalid: :replace)

  # Check if this could be a MSYS2 pty pipe ('\msys-XXXX-ptyN-XX')
  # or a cygwin pty pipe ('\cygwin-XXXX-ptyN-XX')
  name =~ /(msys-|cygwin-).*-pty/ ? true : false
end

# File reline/windows.rb, line 454
def self.prep
  # do nothing
  nil
end

# File reline/windows.rb, line 220
def self.process_key_event(repeat_count, virtual_key_code, virtual_scan_code, char_code, control_key_state)

  # high-surrogate
  if 0xD800 <= char_code and char_code <= 0xDBFF
    @@hsg = char_code
    return
  end
  # low-surrogate
  if 0xDC00 <= char_code and char_code <= 0xDFFF
    if @@hsg
      char_code = 0x10000 + (@@hsg - 0xD800) * 0x400 + char_code - 0xDC00
      @@hsg = nil
    else
      # no high-surrogate. ignored.
      return
    end
  else
    # ignore high-surrogate without low-surrogate if there
    @@hsg = nil
  end

  key = KeyEventRecord.new(virtual_key_code, char_code, control_key_state)

  match = KEY_MAP.find { |args,| key.matches?(**args) }
  unless match.nil?
    @@output_buf.concat(match.last)
    return
  end

  # no char, only control keys
  return if key.char_code == 0 and key.control_keys.any?

  @@output_buf.push("\e".ord) if key.control_keys.include?(:ALT) and !key.control_keys.include?(:CTRL)

  @@output_buf.concat(key.char.bytes)
end

# File reline/windows.rb, line 390
def self.scroll_down(val)
  return if val < 0
  return unless csbi = get_console_screen_buffer_info
  buffer_width, buffer_lines, x, y, attributes, window_left, window_top, window_bottom = csbi.unpack('ssssSssx2s')
  screen_height = window_bottom - window_top + 1
  val = screen_height if val > screen_height

  if @@legacy_console || window_left != 0
    # unless ENABLE_VIRTUAL_TERMINAL,
    # if srWindow.Left != 0 then it's conhost.exe hosted console
    # and puts "\n" causes horizontal scroll. its glitch.
    # FYI irb write from culumn 1, so this gives no gain.
    scroll_rectangle = [0, val, buffer_width, buffer_lines - val].pack('s4')
    destination_origin = 0 # y * 65536 + x
    fill = [' '.ord, attributes].pack('SS')
    @@ScrollConsoleScreenBuffer.call(@@hConsoleHandle, scroll_rectangle, nil, destination_origin, fill)
  else
    origin_x = x + 1
    origin_y = y - window_top + 1
    @@output.write [
      (origin_y != screen_height) ? "\e[#{screen_height};H" : nil,
      "\n" * val,
      (origin_y != screen_height or !x.zero?) ? "\e[#{origin_y};#{origin_x}H" : nil
    ].join
  end
end

# File reline/windows.rb, line 16
def self.set_default_key_bindings(config)
  {
    [224, 72] => :ed_prev_history, # ↑
    [224, 80] => :ed_next_history, # ↓
    [224, 77] => :ed_next_char,    # →
    [224, 75] => :ed_prev_char,    # ←
    [224, 83] => :key_delete,      # Del
    [224, 71] => :ed_move_to_beg,  # Home
    [224, 79] => :ed_move_to_end,  # End
    [  0, 41] => :ed_unassigned,   # input method on/off
    [  0, 72] => :ed_prev_history, # ↑
    [  0, 80] => :ed_next_history, # ↓
    [  0, 77] => :ed_next_char,    # →
    [  0, 75] => :ed_prev_char,    # ←
    [  0, 83] => :key_delete,      # Del
    [  0, 71] => :ed_move_to_beg,  # Home
    [  0, 79] => :ed_move_to_end   # End
  }.each_pair do |key, func|
    config.add_default_key_binding_by_keymap(:emacs, key, func)
    config.add_default_key_binding_by_keymap(:vi_insert, key, func)
    config.add_default_key_binding_by_keymap(:vi_command, key, func)
  end

  {
    [27, 32] => :em_set_mark,             # M-<space>
    [24, 24] => :em_exchange_mark,        # C-x C-x
  }.each_pair do |key, func|
    config.add_default_key_binding_by_keymap(:emacs, key, func)
  end

  # Emulate ANSI key sequence.
  {
    [27, 91, 90] => :completion_journey_up, # S-Tab
  }.each_pair do |key, func|
    config.add_default_key_binding_by_keymap(:emacs, key, func)
    config.add_default_key_binding_by_keymap(:vi_insert, key, func)
  end
end

# File reline/windows.rb, line 432
def self.set_screen_size(rows, columns)
  raise NotImplementedError
end

# File reline/windows.rb, line 450
def self.set_winch_handler(&handler)
  @@winch_handler = handler
end

# File reline/windows.rb, line 443
def self.show_cursor
  size = 100
  visible = 1 # 1 means true
  cursor_info = [size, visible].pack('Li')
  @@SetConsoleCursorInfo.call(@@hConsoleHandle, cursor_info)
end

# File reline/windows.rb, line 303
def self.ungetc(c)
  @@output_buf.unshift(c)
end

# File reline/windows.rb, line 8
def self.win?
  true
end

# File reline/windows.rb, line 12
def self.win_legacy_console?
  @@legacy_console
end

# File reline/windows.rb, line 294
def self.with_raw_input
  yield
end

# File reline/windows.rb, line 152
                     def self.getconsolemode
  mode = "\000\000\000\000"
  @@GetConsoleMode.call(@@hConsoleHandle, mode)
  mode.unpack1('L')
end

# File reline/windows.rb, line 158
                     def self.setconsolemode(mode)
  @@SetConsoleMode.call(@@hConsoleHandle, mode)
end