.main

local App = app.new(...)

local function checkBB(x1,y1,x2,y2,x,y)
  return x >= x1 and x < x2 and y >= y1 and y < y2
end

App.Apps = {}
App.Installed = app.list()
App.Offset = {0,0}
App.Buttons = {}
App.Server = rednet.lookup("appstore", "server")

function App:addButton(x,y,w,h,func)
  table.insert(self.Buttons, {x,y,w,h,func})
end

function App:handleMessage(sender, res, protocol)
  if protocol ~= "appstore" then return
  elseif res.Type == "apps" then
    for code,manifest in pairs(res.Data) do
      self:registerApp(code, manifest)
    end
  elseif res.Type == "app" then self:registerApp(res.Data.Code, res.Data.Manifest)
  end
end

function App:registerApp(code, manifest)
  local icon
  if manifest.Files[".nfp"] then
    self:delete("temp.nfp")
    self:download(manifest.Files[".nfp"].Code, "temp.nfp")
    icon = paintutils.loadImage(App:resolve("temp.nfp"))
  else
    icon = paintutils.loadImage("/missing.nfp")
  end
  table.insert(self.Apps, {Code = code, Name = manifest.Name, Icon = icon})
  local index = #self.Apps
  local w,h = term.getSize()
  self:addButton(w,(index - 1) * 3 + 1,1,1,function()
    app[not self.Installed[code] and "install" or "uninstall"](code)
  end)
end

function App:updateApps()
  self.Installed = app.list()
end

function App:handleClick(button, x, y)
  x,y = x - self.Offset[1],y - self.Offset[2]
  for i,btn in ipairs(self.Buttons) do
    if checkBB(btn[1],btn[2],btn[1]+btn[3],btn[2]+btn[4],x,y) then
      btn[5]()
      break
    end
  end
end

function App:handleScroll(direction, x, y)
  App.Offset[2] = App.Offset[2] - direction
end

function App:draw()
  local w,h = term.getSize()
  term.setBackgroundColor(colors.gray)
  term.setTextColor(colors.white)
  term.clear()
  term.setCursorPos(1,1)
  for i,data in ipairs(self.Apps) do
    local x1,y1 = 1 + self.Offset[1],1 + 3 * (i - 1) + self.Offset[2]
    local x2,y2 = x1 + w - 1, y1 + 2
    local btn = not self.Installed[data.Code] and {"O","5"} or {"X","e"}
    paintutils.drawFilledBox(x1, y1, x2, y2, colors.lightGray)
    paintutils.drawImage(data.Icon, x1, y1)
    term.setTextColor(colors.black)
    term.setBackgroundColor(colors.lightGray)
    term.setCursorPos(x2, y1)
    term.blit(btn[1], "f", btn[2])
    term.setCursorPos(x1 + 3, y1)
    term.write(data.Name)
  end
end

if App.Server then
  App.EventHandler:connect("update_apps", function(...) App:updateApps(...) end)
  App.EventHandler:connect("mouse_scroll", function(...) App:handleScroll(...) end)
  App.EventHandler:connect("mouse_click", function(...) App:handleClick(...) end)
  App.EventHandler:connect("rednet_message", function(...) App:handleMessage(...) end)
  rednet.send(App.Server, { Protocol="get" }, "appstore")
  App:start()
end