local cwd  = (...):gsub('%.listbox$', '') .. "."
local Menu = require(cwd .. "parent")

local menuutils = require(cwd .. "widgets.utils")

local ListBox = Menu:extend()

function ListBox:new(menusystem, name, x, y, w, h, slotNumber)
  self.view = {}
  self.view.slotNumber  = slotNumber
  self.view.firstSlot   = 1
  ListBox.super.new(self, menusystem, name, x, y, w, h)
  self.h = slotNumber * self.widget.h -- On fait en sorte que la hauteur
  -- soit un multiple du nombre de slot et de leur hauteur
end

function ListBox:updateWidgetSize()
  self.widget.h = math.floor( self.h / self.view.slotNumber )
  self.widget.w = self.w
end

function ListBox:update(dt)
  self:updateView()
end

function ListBox:updateView()
  if self.widget.selected < self.view.firstSlot then
    self.view.firstSlot = self.widget.selected
  end
  if self.widget.selected > self.view.firstSlot + self.view.slotNumber - 1 then
    self.view.firstSlot = self.widget.selected - self.view.slotNumber + 1
  end

  if self.view.firstSlot < 1 then
    self.view.firstSlot = 1
  end
end

function ListBox:keyreleased(key, code)

  if key == 'up' then
    self:moveCursor(self.widget.selected - 1)
  end

  if key == 'down' then
    self:moveCursor(self.widget.selected + 1)
  end

  if key == "A" then
    if (self.widget.selected >= 1 and self.widget.selected <= #self.widget.list) then
      self.widget.list[self.widget.selected]:action()
    end
  end

end

function ListBox:mousemoved(x, y)
  local widget_selected = self.view.firstSlot + math.floor(y / self.widget.h)

  if widget_selected >= 1 and widget_selected <= #self.widget.list then
    self.widget.selected = widget_selected
    self:getFocus()
  end
end

function ListBox:mousepressed(x, y, button, isTouch)
  local widget_selected = self.view.firstSlot + math.floor(y / self.widget.h)

  if widget_selected >= 1 and widget_selected <= #self.widget.list then
    self.widget.selected = widget_selected
    self:getFocus()
    if #self.widget.list > 0 then
      self.widget.list[self.widget.selected]:action()
    end
  end

end

function ListBox:draw()
  self:updateView()
  local widgety = self.y
  for i,v in ipairs(self.widget.list) do
    if (i >= self.view.firstSlot) and (i < self.view.firstSlot + self.view.slotNumber) then
      v:draw(self.x, widgety, self.w, self.widget.h)
      if self.widget.selected == i and self:haveFocus() == true then
        v:drawSelected(self.x, widgety, self.w, self.widget.h)
      else
        v:draw(self.x, widgety, self.w, self.widget.h)
      end
      widgety = widgety + self.widget.h
    end
  end
end

function ListBox:drawCursor()
  self:updateView()
  if (self.widget.selected >= 1 and self.widget.selected <= #self.widget.list) then
    local w, h  = self:getWidgetSize()
    local y     = (self.widget.selected - self.view.firstSlot) * h
    menuutils.drawCursor(self.x,self.y + y, w, h)
  end
end

return ListBox