GameRule = fk.CreateTriggerSkill{
    name = "game_rule",
    events = {
        fk.GameStart, fk.TurnStart,
        fk.EventPhaseProceeding, fk.EventPhaseEnd, fk.EventPhaseChanging,
    },
    priority = 0,

    can_trigger = function(self, event, target, player, data)
        return (target == player) or (target == nil)
    end,

    on_trigger = function(self, event, target, player, data)
        if RoomInstance.tag["SkipGameRule"] then
            RoomInstance.tag["SkipGameRule"] = false
            return false
        end

        if target == nil then
            if event == fk.GameStart then
                print("Game started")
                RoomInstance.tag["FirstRound"] = true
            end
            return false
        end

        local room = player.room
        switch(event, {
        [fk.TurnStart] = function()
            player = room.current
            if room.tag["FirstRound"] == true then
                room.tag["FirstRound"] = false
                player:setFlag("Global_FirstRound")
            end

            -- TODO: send log
            
            player:addMark("Global_TurnCount")
            if not player.faceup then
                player:setFlag("-Global_FirstRound")
                player:turnOver()
            elseif not player.dead then
                player:play()
            end
        end,
        [fk.EventPhaseProceeding] = function()
            switch(player.phase, {
            [Player.PhaseNone] = function()
                error("You should never proceed PhaseNone")
            end,
            [Player.RoundStart] = function()
                print("Proceeding RoundStart.")
            end,
            [Player.Start] = function()
                print("Proceeding Start.")
            end,
            [Player.Judge] = function()
                print("Proceeding Judge.")
            end,
            [Player.Draw] = function()
                print("Proceeding Draw.")
            end,
            [Player.Play] = function()
                print("Proceeding Play.")
                room:askForSkillInvoke(player, "rule")
            end,
            [Player.Discard] = function()
                print("Proceeding Discard.")
            end,
            [Player.Finish] = function()
                print("Proceeding Finish.")
            end,
            [Player.NotActive] = function()
                print("Proceeding NotActive.")
            end,
            })
        end,
        [fk.EventPhaseEnd] = function()
            if player.phase == Player.Play then
                -- TODO: clear history
            end
        end,
        [fk.EventPhaseChanging] = function()
            -- TODO: copy but dont copy all
        end,
        default = function()
            print("game_rule: Event=" .. event)
            room:askForSkillInvoke(player, "rule")
        end,
        })
        return false
    end,

}