--[[
    4eyes
]]

-- =============================================================================
-- apis
local component = require("component")
local computer = require("computer")
local event = require("event")
local class = require("30log")
local bridge = component.openperipheral_bridge

-- =============================================================================
-- variables
local api = {}
api.User = class("User")
api.Bridge = class("Bridge")
api.Event = class("Event")

-- =============================================================================
-- classes
do -- Event
  function api.Event:init(handler)
    self.handler = handler
    self.posthandler = nil
  end
  function api.Event:setPostHandler(posthandler)
    self.posthandler = posthandler or nil
  end
  function api.Event:setHandler(posthandler)
    self.handler = handler or nil
  end
  function api.Event:handle(...)
    self.handler(...)
    if type(self.posthandler) == "function" then
      self.posthandler(...)
    end
  end
end
do -- User
  function api.User:init(name, uuid)
    self.uuid = uuid
    self.name = name
    self.captured = false
    self.surface = bridge.getSurfaceByName(self.name)
    self.capture_control = bridge.getCaptureControl(uuid)
    self.objects = {}
  end
  function api.User:addObject(index, obj)
    self.objects[index] = obj
  end
  function api.User:removeObject(index)
    self.objects[index] = obj
  end
  function api.User:getObject(index)
    return self.objects[index] and self.objects[index] or false
  end
  function api.User:getAllObjects()
    return self.objects
  end
  function api.User:renderObjects(br)
    for k, v in pairs(self.objects) do
      if type(v.render) == "function" then
        v:render(br, self)
      end
    end
  end
  function api.User:handleEvents(br, e)
    for k, v in pairs(self.objects) do
      if type(v.event) == "function" then
        v:event(br, self, e)
      end
    end
  end
  function api.User:getSurface()
    return self.surface
  end
  function api.User:getCaptureControl()
    return self.capture_control
  end
  function api.User:clear()
    self.surface.clear()
  end
end

do -- Bridge
  function api.Bridge:init()
    self.users = {}
    self.pulling = true
    self.events = {
      glasses_attach = api.Event(function(br, ev)
        br:addUser(ev[3], ev[4])
      end),
      glasses_detach = api.Event(function(br, ev)
        br:removeUser(ev[3])
      end),
      glasses_capture = api.Event(function(br, ev)
        br:getUser(ev[3]).captured = true
      end),
      glasses_release = api.Event(function(br, ev)
        br:getUser(ev[3]).captured = false
      end)
    }
  end
  function api.Bridge:getUser(name)
    return self.users[name] and self.users[name] or false
  end
  function api.Bridge:addUser(name, uuid)
    self.users[name] = api.User(name, uuid)
  end
  function api.Bridge:removeUser(name)
    self.users[name] = nil
  end
  function api.Bridge:addEvent(name, ev)
    self.events[name] = ev
  end
  function api.Bridge:removeEvent(name)
    self.events[name] = nil
  end
  function api.Bridge:getEvent(name)
    return self.events[name] and self.events[name] or false
  end
  function api.Bridge:eachUser(func)
    for k, v in pairs(self.users) do
      func(self, v)
    end
  end
  function api.Bridge:pull()
    for k,v in pairs(bridge.getUsers()) do
      computer.pushSignal("glasses_attach", bridge.address, v.name, v.uuid)
    end
    while self.pulling do
      local e = {event.pull()}
      if self.events[e[1]] then
        self.events[e[1]]:handle(self, e)
      end
      self:eachUser(function (br, us)
        us:handleEvents(br, e)
      end)
      bridge.sync()
    end
  end
end

-- =============================================================================
-- return library
return api