class Console

# File lib/console.rb, line 32
def initialize(screen, font, height, alpha = 255, activation = 96, background = [255, 255, 255], inputchar = "[>")
  @screen, @font, @height = screen, font, height
  @background = background
  @alpha = alpha
  @inputchar = inputchar
  @activation = activation

  reset
  @id = 0
  @hpos = -1

  @tab = ""

  @active = false
end

# File lib/console.rb, line 172
def draw
  return if !@active

  x = @font.textSize(@inputchar)[0] # Can be any key or number, just for a test
  y = @height - (@font.height * 2)

  @screen.drawFilledRectAlpha(0, 0, @screen.w, @height, @background, @alpha) # Draw white console with space for 5 lines

  @font.drawBlendedUTF8(@screen, @inputchar, 0, @height - @font.height, 0, 0, 0) # Draw input symbol

  unless @buffer.empty?
    @font.drawBlendedUTF8(@screen, @buffer, x, @height - @font.height, 0, 0, 0) # Draw buffer
  end

  @screen.drawLine(x + (@cursor_pos * @font.textSize("a")[0]), @height - @font.height, x + (@cursor_pos * @font.textSize("a")[0]), @height, [0, 0, 0])

  @console_view.reverse_each do |message| # Draw each message that is in view
    @font.drawBlendedUTF8(@screen, message[0], 0, y, 0, 0, 0)
    y -= @font.height
  end
end

# File lib/console.rb, line 66
def execute_string(text)
  if text.include?(" ")
    index = text.index(" ")

    if index > 0
      @name = text.split(" ")[0]
      @args = text.split(" ")[1..text.length] # In case of more than one arg
    end       
  else
    # No arguments, so only command
    @name = text
    @args = nil
  end

  # Delete the last executed command so that only the result shows
  @console_view.delete_at(-1) 
  @console_archive.delete_at(-1)

  begin
      self.__send__(@name, @args)
  rescue
    begin
      self.__send__(@name, "usage")
    rescue
      put("unknown command: #{@name}")
    end
  end

  # Reset buffer and cursorPos
  @buffer = "" 
  @cursor_pos = 0
end

# File lib/console.rb, line 112
def find_commands
  Console.protected_instance_methods(false)
end

# File lib/console.rb, line 130
def keypress?(key)    
  if key.sym != @activation
    case key.sym
    when SDL::Key::RETURN
      if @buffer != ""
        @command_archive << @buffer
        put(@buffer)
        execute_string(@buffer)
      end
    when SDL::Key::SPACE
      insert(" ")
    when SDL::Key::BACKSPACE
      @buffer.slice!(@cursor_pos - 1..@cursor_pos - 1) unless @cursor_pos == 0
      cursor_left
    when SDL::Key::DELETE
      @buffer.slice!(@cursor_pos..@cursor_pos)
    when SDL::Key::PAGEUP
      scroll_up
    when SDL::Key::PAGEDOWN
      scroll_down
    when SDL::Key::UP
      history_up
    when SDL::Key::DOWN
      history_down
    when SDL::Key::LEFT
      cursor_left
    when SDL::Key::RIGHT
      cursor_right
    when SDL::Key::ESCAPE
      @active = !@active
    when SDL::Key::TAB
      tab_complete
    else
      display_key(key.sym, key.mod)
    end if @active
  else
    @active = !@active
  end
end

# File lib/console.rb, line 107
def method_missing(meth, *args)
  put("unknown command: #{@name}")
end

# File lib/console.rb, line 50
def put(string)
  @id += 1 # Increment the id so that each one is unique

  # Put string, @id in both console archive and the console view
  @console_archive << [string, @id]
  @console_view << [string, @id]
  room = ((@height - (@height % @font.height)) / @font.height) - 1
  while @console_view.length > room
    @console_view.shift
  end

  scroll_down
end

# File lib/console.rb, line 99
def reset
  @buffer = ""
  @cursor_pos = 0
  @console_view = []
  @console_archive = []
  @command_archive = []
end

# File lib/console.rb, line 117
def tab_complete
  cmds = find_commands.sort

  e = cmds.find {|i| i.starts_with?(@buffer)}

  if !e.nil?
    @buffer = e
    cursor_end
  end
end

# File lib/command.rb, line 94
def clear(args = nil)
  if args == "usage"
    put("clear: Clears the console")
  else
    reset
  end
end

# File lib/command.rb, line 16
def echo(args)
  if args == "usage"
    put("echo [string]: Outputs string to console")
  elsif args.length > 0
    text = args.join(" ")
    put(text)
  end
end

# File lib/command.rb, line 102
def help(args = nil)
  if args.nil? || args == "usage"
    put("help [command]: Shows the usage for the command")
  elsif args.length > 0
    self.__send__(args[0], "usage")
  end
end

# File lib/command.rb, line 27
def list_commands(args = nil)
  if args == "usage"
    put("list_commands: Outputs possible commands to console")
  else
    commands = find_commands.sort
    put("Possible commands:")
    commands.each do |command|
      if !args.nil?
        if command.include?(args[0])
          put(command)
        end
      else
        put(command)
      end
    end
  end
end

# File lib/command.rb, line 85
def quit(args = nil)
  if args == "usage"
    put("quit: Exits the application")
  else
    exit
  end
end

# File lib/command.rb, line 47
def setalpha(args)
  if args == "usage"
    put("setalpha [integer]: Sets the alpha of console to int")
  elsif args.length > 0
    if (0..255) === args[0].to_i
      @alpha = args[0].to_i
      put("Alpha set to #{@alpha}")
    else
      put("Alpha must be between 0 and 255")
    end
  end
end

# File lib/command.rb, line 62
def setconsolesize(args)
  if args == "usage"
    put("setconsolesize [integer]: Sets the height of the console to int")
  elsif args.length > 0
    if args[0].to_i < @font.height * 2
      put("Console size must be above #{@font.height * 2}")
    elsif args[0].to_i > @screen.h
      put("Console must be less than #{@screen.h}")
    else
      @height = args[0].to_i
      @console_view = []
      room = ((@height - (@height % @font.height)) / @font.height) - 1
      (0..room).each do |i|
        text = @console_archive[-1 - i]
        @console_view << text if !text.nil?
      end
      @console_view.reverse!
      put("Console size set to #{@height}")
    end
  end
end