local function OnEvent(self, event)
	print(CombatLogGetCurrentEventInfo())
end

local f = CreateFrame("Frame")
f:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
f:SetScript("OnEvent", OnEvent)

local playerGUID = UnitGUID("player")
local MSG_CRITICAL_HIT = "Your %s critically hit %s for %d damage!"

local f = CreateFrame("Frame")
f:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
f:SetScript("OnEvent", function(self, event)
	local _, subevent, _, sourceGUID, _, _, _, _, destName = CombatLogGetCurrentEventInfo()
	local spellId, amount, critical

	if subevent == "SWING_DAMAGE" then
		amount, _, _, _, _, _, critical = select(12, CombatLogGetCurrentEventInfo())
	elseif subevent == "SPELL_DAMAGE" then
		spellId, _, _, amount, _, _, _, _, _, critical = select(12, CombatLogGetCurrentEventInfo())
	end

	if critical and sourceGUID == playerGUID then
		-- get the link of the spell or the MELEE globalstring
		local action = spellId and GetSpellLink(spellId) or MELEE
		print(MSG_CRITICAL_HIT:format(action, destName, amount))
	end
end)