local love = assert( love )
local lg = assert( love ).graphics
local utf8 = require 'utf8'

local button = require 'ui.button'
local textinput = require 'ui.textinput'
local modal = require 'ui.modal'
local map = require 'map.map'
local camera = require 'ui.camera'

local t = {}
local city


local function keypressed( key, code, isRepeat )
  if code == 'escape' then return modal.current:stop() end
  if modal.previous then return modal.previous.keypressed( key, code, isRepeat ) end
end

--select modal: as normal, but clicking a city will proceed to the previously selected mode,
--and clicking escape will clear the previously selected mode
local selectModal = modal.new{}
local textModal = modal.new{}
local numberModal = modal.new{}
local editModal = modal.new{ mousepressed = button.mousepressed, keypressed = keypressed, }
local moveModal = modal.new{ mousepressed = button.mousepressed, keypressed = keypressed, mousemoved = button.selectIn }
local deleteModal = modal.new{ keypressed = keypressed }
local currentMode

button.new{ name = "NEW CITY",
  group = t,
  icon = lg.newImage("icons/city-new.png"),
  x = 615,
  y = 0,
  callback = function()
    city = map.cities.newCity()
    city:add()
    return editModal:start()
  end
}

moveModal.button = button.new{ name = "MOVE CITY",
  group = t,
  icon = lg.newImage("icons/city-move.png"),
  x = 615,
  y = button.h + 4,
  callback = function( self )
    self.lit = true
    selectModal.mode = moveModal
    return selectModal:start()
  end,
}

editModal.button = button.new{ name = "EDIT CITY",
  group = t,
  x = 615,
  y = (button.h + 4) * 2,
  callback = function( self ) 
    self.lit = true
    selectModal.mode = editModal
    return selectModal:start()
  end,
}

deleteModal.button = button.new{ name = "DELETE CITY",
  group = t,
  icon = lg.newImage("icons/city-delete.png"),
  x = 615,
  y = (button.h + 4) * 3,
  callback = function( self ) 
    self.lit = true
    return deleteModal:start()
  end,
}

--editButtons
local function editText( self )
  print( "editing: ", self.field, city.name )
  self.lit = true
  return textModal:start( self.field )
end

local function editNumber( self )
  print( "editing: ", self.field, city.name )
  self.lit = true
  return numberModal:start( self.field )
end

local editButtons = {

  save = button.new{
    icon = lg.newImage( "icons/check.png" ),
    callback = function() return editModal:stop() end,},


  name = button.new{ callback = editText },
  country = button.new{ callback = editText },
  x = button.new{ callback = editNumber },
  y = button.new{ callback = editNumber },
  capital = button.new{ callback = function( self ) 
      if city then
        self.name = tostring( not( city.capital ) )
        return city:toggleCapital()
      end
    end },
}

do
  local i = 0
  for _, key in ipairs{ "save", "name", "country", "x", "y", "capital" } do
    local b = assert( editButtons[ key ] )
    b.align = "right"
    b.field = key
    b.name = tostring( key ) --bools must be cast to string before getting passed to printf
    b.group = editModal
    b.x = lg.getWidth() / 2 - button.w / 2
    b.y = (button.h + 4) * i
    i = i + 1
  end
end

function editModal:start()
  modal.start( self )
  button.displayGroup( self, false, true )
  for k, b in pairs( editButtons ) do
    b.name = tostring( city[k] or b.name )
  end
  if city.capital == false then editButtons.capital.name = "false" end
end

function editModal:stop()
  return modal.stop( self )
end

function editModal.draw()
  lg.setColor( 1, 1, 1, 0.5 )
  return button:draw()
end

function moveModal.update( dt )
  local x, y = love.mouse.getPosition()
  if y > t.menuHeight and love.mouse.isDown( 1 ) then
    local wx, wy = camera.GetWorldCoordinate( x, y )
    city:moveTo( wx, wy )
  end
end

function moveModal.mousemoved( x, y, dx, dy, istouch )
  return button.selectIn( x, y )
end

function moveModal.mousepressed( x, y, mouseButton, istouch, presses )
  if y < t.menuHeight then
    moveModal:stop()
    return button.mousepressed( x, y, mouseButton, istouch, presses )
  end
  if map.selected and mouseButton == 2 then
    city = map.selected
  end
end

function deleteModal.mousepressed( x, y, mouseButton, istouch, presses )
  if map.selected then
    map.selected:delete()
  end
  if y < t.menuHeight then
    deleteModal.button.lit = false
    deleteModal:stop()
    return button.mousepressed( x, y, mouseButton, istouch, presses )
  end
end


function numberModal:start( field )
  self.field = field
  return modal.start( self )
end

function numberModal.keypressed( key, code, isrepeat )
  if code == "backspace" then
    local text = tostring( city[numberModal.field] )
    -- get the byte offset to the last UTF-8 character in the string.
    local byteoffset = utf8.offset(text, -1)
    print( "textmodal: backspace", byteoffset )

    if byteoffset then
      -- remove the last UTF-8 character.
      -- string.sub operates on bytes rather than UTF-8 characters, so we couldn't do string.sub(text, 1, -2).
      local newstr = text:sub( 1, byteoffset - 1)
      if newstr == "" then newstr = 0 end
      city[numberModal.field] = tonumber( newstr ) or city[numberModal.field] 
      editButtons[numberModal.field].name = city[numberModal.field]
    end
  end
  if code == "escape" or code == "return" then
    return numberModal:stop()
  end
end

function numberModal.textinput( char )
  local str = tostring( city[ numberModal.field ] )
  local plus = str..char
  print( "text input: ", char )
  if tonumber( plus ) then
    city[ numberModal.field ] = plus
    editButtons[ numberModal.field ].name = plus
  end
end

function textModal.textinput( char )
  print( "text input: ", char )
  city[textModal.field] = city[textModal.field] .. char
  editButtons[textModal.field].name = city[textModal.field]
end

function textModal.mousepressed()
end

function textModal:stop()
  self.field = nil
  return modal.stop( self )
end

function textModal:start( field )
  self.field = field
  return modal.start( self )
end


function textModal.keypressed( key, code, isRepeat )
  if code == "backspace" then
    local text = city[textModal.field]
    -- get the byte offset to the last UTF-8 character in the string.
    local byteoffset = utf8.offset(text, -1)
    print( "textmodal: backspace", byteoffset )

    if byteoffset then
      -- remove the last UTF-8 character.
      -- string.sub operates on bytes rather than UTF-8 characters, so we couldn't do string.sub(text, 1, -2).
      city[textModal.field] = text:sub( 1, byteoffset - 1)
      editButtons[textModal.field].name = city[textModal.field]
    end
  end
  if code == "escape" or code == "return" then
    return textModal:stop()
  end
end

function selectModal.keypressed( key, code, isRepeat )
  if code == 'escape' then return selectModal:stop() end
  if modal.previous then return modal.previous.keypressed( key, code, isRepeat ) end
end

function selectModal:stop()
  local mode = selectModal.mode
  if mode then
    mode.button.lit = false
  end
  return modal.stop( self )
end

function selectModal.mousepressed( x, y, mouseButton, istouch, presses )
  if y < t.menuHeight then
    selectModal:stop()
    return button.mousepressed( x, y, mouseButton, istouch, presses )
  end

  if map.selected then
    city = map.selected
    return selectModal.mode:start()
  end
end

function t.setMenuHeight( h )
  t.menuHeight = h
end

return t