var contentType = 'text/plain;charset=utf-8'

var cols = 80
var rows = 24
var dragging = false
var drawing = true
var erasing = false
var focused

var canvas, tools, palette, brush, mode, current_tool

var color_names = ("white black dark-blue green red dark-red purple orange" +
                   "yellow lime dark-cyan cyan blue magenta dark-gray light-gray").split(" ");
var letters = "abcdefghijklmnop";
var colors = {}, controls = {}
color_names.forEach(function(name, i){ colors[name] = i })

// var tools = "square circle rectangle"

function init () {
  build()
  bind()
}
function build () {
	canvas = new Matrix (cols, rows, function(x,y){
		var lex = new Lex (x,y)
		if (x > y || y > x + 20 || x > y / 4 + 10) {
			lex.clear()
		}
		else {
			lex.bg = x+y*y
			lex.fg = (x+y)%2
			lex.char = ":"
		}
		lex.build()
		return lex
	})
	brush = new Matrix (5, 5, function(x,y){
		var lex = new Lex (x,y)
		lex.build()
		return lex
	})
	palette = new Matrix (32, 2, function(x,y){
		var lex = new Lex (x,y)
		lex.bg = y>>1
		lex.build()
		return lex
	})
	canvas.append(canvas_rapper)
	brush.append(brush_rapper)
	palette.append(palette_rapper)
	
	controls.circle = new Tool (circle_el)
	controls.circle.use = function(){
		brush.generate = controls.circle.generate
		brush.generate()
		drawing = true
	}
	controls.circle.generate = function(){
		var fg = brush.fg, bg = brush.bg
		var hw = brush.w/2|0, hh = brush.h/2|0
		brush.forEach(function(lex,x,y) {
			var len = Math.sqrt(Math.pow(x-hw,2)+Math.pow(y-hh,2))
			if (len > Math.abs(hw)) {
				lex.clear()
			}
			else {
				lex.fill(fg,bg)
			}
		})
	}
	
	controls.square = new Tool (square_el)
	controls.square.use = function(){
		brush.generate = controls.square.generate
		brush.generate()
		drawing = true
	}
	controls.square.generate = function(){
		var fg = brush.fg, bg = brush.bg
		brush.fill(fg,bg)
	}

	controls.text = new Tool (text_el)
	controls.text.use = function(){
		brush.generate = controls.text.generate
		brush.generate()
		drawing = false
	}
	controls.text.generate = function(){
	}
	
	controls.width = new Lex (width_el)
	controls.height = new Lex (height_el)
	
  controls.circle.focus()

	brush.bg = colors.red
	brush.generate()
	brush.build()
}
function bind () {
  canvas.forEach(function(lex, x, y){
  	lex.span.addEventListener('mousedown', function(e){
      e.preventDefault()
			dragging = true
      if (drawing) {
				erasing = e.which == "3"
				draw(lex, x, y, erasing)
			}
			else {
				lex.focus()
			}
    })
    lex.span.addEventListener("mousemove", function(){
			if (! dragging) return
			if (drawing) {
				draw(lex, x, y, erasing)
			}
			else {
				lex.focus()
			}
    })
  })
  palette.forEach(function(lex, x, y){
  	lex.span.addEventListener('mousedown', function(e){
      e.preventDefault()
      dragging = true
      erasing = e.which == "3"
			brush.fg = lex.fg
			brush.bg = lex.bg
			brush.generate()
    })
	})
  brush.forEach(function(lex, x, y){
  	lex.span.addEventListener('mousedown', function(e){
      e.preventDefault()
      dragging = true
// 			lex.fill(lex.fg, lex.bg)
    })
	})
  window.addEventListener('mouseup', function(){
    dragging = erasing = false
  });
  
	[controls.width, controls.height].forEach(function(lex){
  	lex.span.addEventListener('mousedown', function(e){
			lex.focus()
		})
	});
	
	[controls.square, controls.circle, controls.text].forEach(function(tool){
  	tool.span.addEventListener('mousedown', function(e){
			tool.focus()
		})
	})

	controls.width.key = int_key(function(n, keyCode){
		controls.width.blur()
		controls.width.char = ""+n
		controls.width.build()
		brush.w = n
		brush.rebuild()
	})
	controls.height.key = int_key(function(n, keyCode){
		controls.height.blur()
		controls.height.char = ""+n
		controls.height.build()
		brush.h = n
		brush.rebuild()
	})
	window.addEventListener('keydown', function(e){
		if (! e.metaKey && ! e.ctrlKey && ! e.altKey) {
			e.preventDefault()
		}
		switch (e.keyCode) {
			case 27: // esc
				if (focused) focused.blur()
				break
			default:
				if (focused) focused.key(String.fromCharCode(e.keyCode), e.keyCode)
				break
		}
	})
}
function int_key (f) {
	return function (key, keyCode) {
		var n = parseInt(key)
		n && f(n)
	}
}



function draw (lex, x, y, erasing) {
	stamp (canvas, brush, x, y, erasing)
}
function stamp (canvas, brush, x, y, erasing) {
	hh = brush.w/2|0
	brush.forEach(function(lex, s, t){
		s += x-hh
		t += y-hh
		if (s >= 0 && s < canvas.w && t >= 0 && t < canvas.h) {
			canvas.aa[t][s].clone(lex)
		}
	})
}
function mod (i,n) {
  return i - n * Math.floor(i / n)
}

document.body.addEventListener('copy', function (e) {
  if (e.clipboardData) {
    e.preventDefault();
    e.clipboardData.setData(contentType, canvas.ascii());
  }
  if (window.clipboardData) {
    e.returnValue = false;
    window.clipboardData.setData(contentType, canvas.ascii());
  }
}, false);

init()