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

local GridBox = Menu:extend()

function GridBox:new(menusystem, name, x, y, w, h, colNumber, lineNumber)
  self.view = {}
  self.view.slotNumber = colNumber * lineNumber
  self.view.colNumber = colNumber
  self.view.colNumber = lineNumber
  GridBox.super.new(self, menusystem, name, x, y, w, h)
  self.begin = 1
  self.h = lineNumber * self.widget.h -- On fait en sorte que la hauteur
  self.w = colNumber * self.widget.w -- et la largeur
  -- soit un multiple du nombre de slot et de leur dimensions
  self.cursor = {}
  self.cursor.x = 0
  self.cursor.y = 0

  -- La gridbox possède la particularité de pouvoir fusioner des slots, on fait
  -- donc une liste de slots disponibles, qui serviront par la suite.
  self.slots = {}
  for i= 1, self.view.slotNumber do
    self.slots[i]          = {}
    self.slots[i].height   = 1
    self.slots[i].width    = 1
    self.slots[i].isChild  = 0
    self.slots[i].widgetID = i
  end
end

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

function GridBox:getWidgetSize(id)
  local slot = self:getWidgetSlot(id)
  return self.slots[slot].width, self.slots[slot].height
end

function GridBox:getWidgetSlot(widgetID)
  local slot = 0
  for i,v in ipairs(self.slots) do
    if (self.slots[i].widgetID == widgetID) then
      slot = i
    end
  end

  return slot
end

function GridBox:update(dt)
  self.begin = 1
  local slotID = self:getSlotbyCoord(self.cursor.x, self.cursor.y)
  if self.slots[slotID].isChild > 0 then
    slotID = self.slots[slotID].isChild
  end
  self.widget.selected = self.slots[slotID].widgetID
  self.cursor.x, self.cursor.y = self:getCoord(slotID)
end

function GridBox:regenSlots()
  local widgetID = 1
  for i,v in ipairs(self.slots) do
    if v.isChild == 0 and (widgetID <= #self.widget.list) then
      self.slots[i].widgetID = widgetID
      widgetID = widgetID + 1
    end
  end
end

function GridBox:addCol(slotID)
  local col, line = self:getCoord(slotID)
  if (col + self.slots[slotID].width + 1) <= self.view.colNumber then
    slotChild = slotID + self.slots[slotID].width
    for i = 1, self.slots[slotID].height do
      self.slots[slotChild + ((i-1)* self.view.colNumber)].isChild = slotID
    end
    self.slots[slotID].width = self.slots[slotID].width + 1
  end
end

function GridBox:addLine(slotID)
  local col, line = self:getCoord(slotID)
  if (line + self.slots[slotID].height + 1) <= self.view.colNumber then
    slotChild = slotID + (self.slots[slotID].height * self.view.colNumber)
    for i = 1, self.slots[slotID].width do
      self.slots[slotChild + (i-1)].isChild = slotID
    end
    self.slots[slotID].height = self.slots[slotID].height + 1
  end
end

function GridBox:getCoord(id_selected)
  id_selected = id_selected - 1 -- On simplifie les calcul en prenant 0 comme départ
  local line, col
  line = math.floor(id_selected / self.view.colNumber)
  col = id_selected - (line * self.view.colNumber)
  return col, line
end

function GridBox:getSlotbyCoord(col, line)
  return (line * self.view.colNumber) + col + 1
end

function GridBox:getSlot(widgetID)
  local slotID
  for i,v in ipairs(self.slots) do
    if v.widgetID == widgetID then
      return i
    end
  end
  return 0
end

function GridBox:moveCursor(newcol, newline)
  local col, line = self.cursor.x, self.cursor.y
  local relcol, relline = newcol - col, newline - line
  self.cursor.x, self.cursor.y = newcol, newline

  while self.cursor.y < 0 do
    self.cursor.y = self.cursor.y + self.view.colNumber
  end

  while self.cursor.x < 0 do
    self.cursor.x = self.cursor.x + self.view.colNumber
  end

  while self.cursor.y >= self.view.colNumber do
    self.cursor.y = self.cursor.y - self.view.colNumber
  end

  while self.cursor.x >= self.view.colNumber do
    self.cursor.x = self.cursor.x - self.view.colNumber
  end
  previousSlot = self:getSlotbyCoord(col, line)
  newSlot = self:getSlotbyCoord(self.cursor.x, self.cursor.y)

  if (self.slots[newSlot].isChild > 0) or (self.slots[newSlot].widgetID > #self.widget.list) then
    if (self.slots[newSlot].isChild == previousSlot) or (self.slots[newSlot].widgetID > #self.widget.list) then
      self:moveCursor(self.cursor.x + relcol, self.cursor.y + relline)
    end
  end

end

function GridBox:keyreleased(key, code)
  slotID = self:getSlot(self.widget.selected)
  local col, line = self.cursor.x, self.cursor.y
  if key == 'left' then
    --self:moveCol(-1)
    self:moveCursor(col - 1, line)
  end

  if key == 'right' then
    --self:moveCol(1)
    self:moveCursor(col + 1, line)
  end

  if key == 'up' then
    self:moveCursor(col, line - 1)
  end

  if key == 'down' then
    self:moveCursor(col, line + 1)
  end

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

function GridBox:mousemoved(x, y)
  local col, line = self:getCoord(self.widget.selected)
  local begincol, beginline = self:getCoord(self.begin)
  local newcol, newline
  local newselect, slotID

  newline = beginline + math.floor(y / self.widget.h)
  newcol  = math.floor(x / self.widget.w)
  self.cursor.x = newcol
  self.cursor.y = newline

  if self.widget.selected < 1 then
    self.widget.selected = 1
  end
  if self.widget.selected > #self.widget.list then
    self.widget.selected = #self.widget.list
  end

end

function GridBox:mousepressed(x, y, button, isTouch)
  local col, line = self:getCoord(self.widget.selected)
  local begincol, beginline = self:getCoord(self.begin)
  local newcol, newline
  local newselect, slotID

  newline = beginline + math.floor(y / self.widget.h)
  newcol  = math.floor(x / self.widget.w)
  newselect = (newline * self.view.colNumber) + newcol + 1

  if self.slots[newselect].isChild > 0 then
    slotID = self.slots[newselect].isChild
  else
    slotID = newselect
  end

  self.widget.selected = self.slots[slotID].widgetID

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

function GridBox:draw()
  local widgety = self.y
  local widgetx = self.x

  self:regenSlots() -- On reget les slots au cas où :p
  for i,v in ipairs(self.slots) do
    if (v.isChild == 0) and (v.widgetID <= #self.widget.list) then
      --self.widget.list[v.widgetID]:draw(widgetx, widgety, self.widget.w * v.sizeW, self.widget.h * v.sizeH)
      if self.widget.selected == v.widgetID and self:haveFocus() == true then
        self.widget.list[v.widgetID]:drawSelected(widgetx, widgety, self.widget.w * v.sizeW, self.widget.h * v.sizeH)
      else
        self.widget.list[v.widgetID]:draw(widgetx, widgety, self.widget.w * v.sizeW, self.widget.h * v.sizeH)
      end
    end
    if (v.isChild > 0) and false then
      love.graphics.setColor(255,255,255,128)
      love.graphics.rectangle("fill", widgetx, widgety, self.widget.w, self.widget.h)
    end
    local col, line = self:getCoord(i)

    if (col == self.cursor.x) and (line == self.cursor.y) and false then
      love.graphics.setColor(255,255,0,128)
      love.graphics.rectangle("fill", widgetx, widgety, self.widget.w, self.widget.h)
    end

    --love.graphics.setColor(0,0,0,10)
    --love.graphics.rectangle("line", widgetx, widgety, self.widget.w, self.widget.h)
    widgetx = widgetx + self.widget.w
    if widgetx == (self.x + self.w) then
      widgetx = self.x
      widgety = widgety + self.widget.h
    end
  end
end

return GridBox