local MenuSystem = Object:extend()
local BaseMenu = {"attack", "techs", "object", "defend", "flee", "back"}

local MENUPOS_X1, MENUPOS_X2, MENUPOS_Y = 32, 32, 110

function MenuSystem:new( controller )
  self.controller = controller
  self.isActive   = false
  self.techList   = {}

  self.menu       = {}
  self.menu[1]    = BaseMenu

  self.texture = love.graphics.newImage("assets/gui/attacklist.png")
  self.cursorTexture = love.graphics.newImage("assets/gui/cursor-menulist.png")
  self.font = love.graphics.newFont("assets/fonts/PixelOperator.ttf", 16)
  self.cursor = 1
  self.cursorTransition = 1
  self.view   = 1
end

function MenuSystem:set(currentCharacter)
  self.isActive   = true
  self.cursor     = 1
  self.cursorTransition = 0
  self.activeMenu = 1

  self.character = currentCharacter

  self.menu[2]  = self:getSkillList()
  self.menu[3]  = {"healitems", "rings", "wisps", "other", "back"}

end

function MenuSystem:getSkillList()
  local list = game.characters:getSkillList(self.character.charid)
  local skillmenu = {}
  for k,v in pairs(list) do
    table.insert(skillmenu, k)
  end

  table.insert(skillmenu, "back")

  return skillmenu
end

function MenuSystem:unset(  )
  self.isActive = false
end

function MenuSystem:update(dt)
  if (self.isActive) then
    local keys = game.input.keys

    if self.cursor < self.view then
      self.view = self.cursor
    end
    if self.cursor > self.view + 5 then
      self.view = self.cursor - 5
    end

    local relativecursor = self.cursor - self.view

    local transition = self.cursorTransition - relativecursor

    if math.abs(transition) < 0.1 then
      self.cursorTransition = relativecursor
    else
      self.cursorTransition = (self.cursorTransition) + ((relativecursor) - (self.cursorTransition)) * dt*45
    end

    if (keys["up"].isPressed) then
      if (self.cursor == 1) then
        self.cursor = #self.menu[self.activeMenu]
      else
        self.cursor = self.cursor - 1
      end
    end

    if (keys["down"].isPressed) then
      if (self.cursor == #self.menu[self.activeMenu]) then
        self.cursor = 1
      else
        self.cursor = self.cursor + 1
      end
    end

    if keys["left"].isPressed then
      self.character.direction = -1
    end

    if keys["right"].isPressed then
      self.character.direction = 1
    end

    if (keys["A"].isPressed) then
      if self.activeMenu == 1 then
        if (self.cursor == 2 or self.cursor == 3) then
          self.activeMenu = self.cursor
          self.cursor = 1
        else
          self:sendSignal(self.activeMenu, self.cursor)
        end
      else
        self:sendSignal(self.activeMenu, self.cursor)
      end
    end

    if (keys["B"].isPressed) then
      if self.activeMenu == 1 then
        self:sendSignal(1, 6)
      else
        self.cursor     = self.activeMenu
        self.activeMenu = 1
      end
    end
  end
end

function MenuSystem:sendSignal(menu, id)
  --print(self.menu[menu][id])
  self.isActive = false
  if (menu == 1) then
    self.character:getSignal(BaseMenu[id], 1)
  else
    self.character:getSignal(BaseMenu[menu], id)
  end
end

function MenuSystem:draw()
  if (self.isActive) then
    local x, y, addition
    x = 32
    y = 32
    addition = 16
    local currentMenu = self.menu[self.activeMenu]
    -- MENUPOS_X1, MENUPOS_X2, MENUPOS_Y
    local MENUPOS_X = MENUPOS_X1
    local maxView = math.min(#currentMenu, (self.view + 5))

    for i = self.view, maxView do
      love.graphics.draw(self.texture, MENUPOS_X - 16, MENUPOS_Y + (i-self.view)*addition + 3)
      love.graphics.setFont(self.font)
      love.graphics.setColor(0, 0, 0, .8)
      love.graphics.print(currentMenu[i], MENUPOS_X + 1, MENUPOS_Y + (i-self.view)*addition + 1)
      if (i == self.cursor) then
        love.graphics.setColor(1, 1, 1, 1)
      else
        love.graphics.setColor(1, 1, 1, 1)
      end
      love.graphics.print(currentMenu[i], MENUPOS_X, MENUPOS_Y + (i-self.view)*addition)

      love.graphics.setColor(1, 1, 1, 1)
    end

    love.graphics.draw(self.cursorTexture, MENUPOS_X - 12, MENUPOS_Y + (self.cursorTransition) * addition + 2 )
  end
end

return MenuSystem