--视野系统
local VisualFieldSystem = {}

function VisualFieldSystem.OnVisualFieldChanged(visualFieldComp, oldLv, oldGroup)
    if oldLv > visualFieldComp:GetVisiblityLevel() then
    	if visualFieldComp.entity.components.target then
	    	if visualFieldComp.entity.components.target.Target and not LevelManager.CurLevelFunc:CanSeeEntity(visualFieldComp.entity, visualFieldComp.entity.components.target.Target) then
	    		SystemManager.SetTarget(visualFieldComp.entity, nil)
			end
		end
    end
end

function VisualFieldSystem.OnVisiblityChanged(visualFieldComp, oldLv, oldGroup)
	if oldLv < visualFieldComp:GetVisiblityLevel() then
		local changedEntity = visualFieldComp.entity
		for i,_entity in ipairs(LogicUpdateManager.EntityList_Normal) do
			if _entity.components.target and _entity.components.target.Target == changedEntity then
				SystemManager.SetTarget(_entity, nil)
			end
		end

		for i,_entity in ipairs(LogicUpdateManager.EntityList_Sync) do
			if _entity.components.target and _entity.components.target.Target == changedEntity then
				SystemManager.SetTarget(_entity, nil)
			end
		end
	end
end

--根据视野等级看能否看到entity
function VisualFieldSystem.CanSeeEntityByVisualLevel(seeingEntity, beSawEntity)
    local seeingEntityVisualComp = seeingEntity.components.visualField
    local otherVisualComp = beSawEntity.components.visualField
    if seeingEntityVisualComp and otherVisualComp then
        local beSawEntityVisiblityLevel = otherVisualComp:GetVisiblityLevel()
        local seeingEntityVisualLevel = seeingEntityVisualComp._visualLv
        local seeingEntityVisualGroup = seeingEntityVisualComp._visualGroup
        local beSawEntityVisiblityGroup = otherVisualComp._visualbilityGroup
        --0 nil 0 -1，四个值，优化
        return ((beSawEntityVisiblityGroup == -1 or seeingEntityVisualGroup == -1 or seeingEntityVisualGroup == beSawEntityVisiblityGroup) and seeingEntityVisualLevel == beSawEntityVisiblityLevel) or seeingEntityVisualLevel > beSawEntityVisiblityLevel
    end
    return true
end

--共享视野等级
function VisualFieldSystem.CanSeeEntityByShareVisualLevel(seeingEntity, beSawEntity, campVisualDic)
    local beSawEntityVisualFieldComp = beSawEntity.components.visualField
    local beSawEntityVisibilityLv = beSawEntityVisualFieldComp:GetVisiblityLevel()
    local beSawEntityVisibilityGroup = beSawEntityVisualFieldComp._visualbilityGroup
    local result = false
    local campID = seeingEntity:GetCampID()
    local campVisualList = campVisualDic[campID]
    if campVisualList then
        for i,v in ipairs(campVisualList) do
        	if VisualFieldSystem.CanSeeEntityByVisualLevel(seeingEntity, beSawEntity) then
                return true
            end
        end
    end
    return false
end
return VisualFieldSystem