local addonname, data = ...
---@cast data HeimdallData
---@cast addonname string

data.Spotter = {}
function data.Spotter.Init()
	if not data.config.spotter.enabled then
		print("Heimdall - Spotter disabled")
		return
	end

	local function FormatHP(hp)
		if hp > 1e9 then
			return string.format("%.1fB", hp / 1e9)
		elseif hp > 1e6 then
			return string.format("%.1fM", hp / 1e6)
		elseif hp > 1e3 then
			return string.format("%.1fK", hp / 1e3)
		else
			return hp
		end
	end

	---@type table<string, number>
	local throttleTable = {}

	---@param unit string
	---@param name string
	---@param faction string
	---@param hostile boolean
	---@return boolean
	---@return string? error
	local function ShouldNotify(unit, name, faction, hostile)
		if data.config.spotter.stinky then
			if data.config.stinkies[name] then return true end
		end
		if data.config.spotter.alliance then
			if faction == "Alliance" then return true end
		end
		if data.config.spotter.hostile then
			if hostile then return true end
		end
		return data.config.spotter.everyone
	end

	---@param unit string
	---@return string?
	local function NotifySpotted(unit)
		if not unit then return string.format("Could not find unit %s", tostring(unit)) end
		if not UnitIsPlayer(unit) then return nil end

		local name = UnitName(unit)
		if not name then return string.format("Could not find name for unit %s", tostring(unit)) end

		local time = GetTime()
		if throttleTable[name] and time - throttleTable[name] < data.config.spotter.throttleTime then
			return string.format("Throttled %s", tostring(name))
		end
		throttleTable[name] = time

		local race = UnitRace(unit)
		if not race then return string.format("Could not find race for unit %s", tostring(unit)) end
		local faction = data.raceMap[race]
		if not faction then return string.format("Could not find faction for race %s", tostring(race)) end

		local hostile = UnitCanAttack("player", unit)
		local doNotify = ShouldNotify(unit, name, faction, hostile)
		if not doNotify then return string.format("Not notifying for %s", tostring(name)) end

		local hp = UnitHealth(unit)
		if not hp then return string.format("Could not find hp for unit %s", tostring(unit)) end

		local maxHp = UnitHealthMax(unit)
		if not maxHp then return string.format("Could not find maxHp for unit %s", tostring(unit)) end

		local location = data.config.spotter.zoneOverride
		if not location then
			local zone = GetZoneText()
			if not zone then return string.format("Could not find zone for unit %s", tostring(unit)) end
			local subzone = GetSubZoneText()
			if not subzone then subzone = "" end
			location = string.format("%s (%s)", zone, subzone)
		end

		local stinky = data.config.stinkies[name] or false
		local text = string.format("I see (%s) %s %s of race %s (%s) with health %s/%s at %s",
			hostile and "Hostile" or "Friendly",
			stinky and string.format("(%s)", "!!!!") or "",
			name,
			race,
			faction,
			FormatHP(hp),
			FormatHP(maxHp),
			location)

		---@type Message
		local msg = {
			channel = "CHANNEL",
			data = data.config.spotter.notifyChannel,
			message = text
		}
		data.dumpTable(msg)
		table.insert(data.messenger.queue, msg)
	end

	local frame = CreateFrame("Frame")
	frame:RegisterEvent("NAME_PLATE_UNIT_ADDED")
	frame:RegisterEvent("TARGET_UNIT_CHANGED")
	frame:SetScript("OnEvent", function(self, event, unit)
		local err = NotifySpotted(unit)
		if err then
			print(string.format("Error notifying %s: %s", tostring(unit), tostring(err)))
		end
	end)

	print("Heimdall - Spotter loaded")
end