NanamiPlates_Threat = {}

local NP = NanamiPlates

local string_find = string.find
local string_sub = string.sub
local string_format = string.format
local string_gfind = string.gfind
local pairs = pairs
local ipairs = ipairs
local tonumber = tonumber
local tostring = tostring
local GetTime = GetTime
local UnitName = UnitName
local UnitExists = UnitExists
local UnitIsUnit = UnitIsUnit
local UnitInRaid = UnitInRaid
local UnitInParty = UnitInParty
local SendAddonMessage = SendAddonMessage

local GP_TankModeThreats = {}
local GP_Threats = {}
local GP_TankPlayers = {}

NanamiPlates_Threat.GP_TankModeThreats = GP_TankModeThreats
NanamiPlates_Threat.GP_Threats = GP_Threats
NanamiPlates_Threat.GP_TankPlayers = GP_TankPlayers

local function GP_Split(str, delimiter)
    local result = {}
    local pattern = "([^" .. delimiter .. "]+)"
    for match in string_gfind(str, pattern) do
        table.insert(result, match)
    end
    return result
end

local function GP_HandleTankModePacket(packet)
    local startPos = string_find(packet, "TMTv1=")
    if not startPos then return end
    local dataStr = string_sub(packet, startPos + 6)

    for k in pairs(GP_TankModeThreats) do GP_TankModeThreats[k] = nil end

    local entries = GP_Split(dataStr, ";")
    for _, entry in ipairs(entries) do
        local parts = GP_Split(entry, ":")
        if parts[1] and parts[2] and parts[3] and parts[4] then
            GP_TankModeThreats[parts[2]] = {
                creature = parts[1],
                name = parts[3],
                perc = tonumber(parts[4]) or 0
            }
        end
    end
end

local function GP_HandleThreatPacket(packet)
    local startPos = string_find(packet, "TWTv4=")
    if not startPos then return end
    local dataStr = string_sub(packet, startPos + 6)

    for k in pairs(GP_Threats) do GP_Threats[k] = nil end

    local entries = GP_Split(dataStr, ";")
    for _, entry in ipairs(entries) do
        local parts = GP_Split(entry, ":")
        if parts[1] and parts[3] and parts[4] then
            GP_Threats[parts[1]] = {
                threat = tonumber(parts[3]) or 0,
                perc = tonumber(parts[4]) or 0,
                tank = (parts[6] == "1")
            }
        end
    end
end

local NP_ADDON_PREFIX = "NanamiPlates"
local TANK_BROADCAST_DEBOUNCE = 5
local lastTankBroadcast = 0

function NanamiPlates_Threat.BroadcastTankMode(force)
    local now = GetTime()
    if not force and (now - lastTankBroadcast) < TANK_BROADCAST_DEBOUNCE then return end

    local playerRole = NP and NP.playerRole
    local isTank = (playerRole == "TANK")
    local msg = isTank and "TM=1" or "TM=0"

    local myName = UnitName("player")
    if myName then
        GP_TankPlayers[myName] = isTank or nil
    end

    if UnitInRaid("player") then
        SendAddonMessage(NP_ADDON_PREFIX, msg, "RAID")
        lastTankBroadcast = now
    elseif UnitInParty() then
        SendAddonMessage(NP_ADDON_PREFIX, msg, "PARTY")
        lastTankBroadcast = now
    end
end

function NanamiPlates_Threat.IsPlayerTank(playerName)
    if not playerName then return false end
    return GP_TankPlayers[playerName] == true
end

local function GP_HandleTankModeMessage(sender, msg)
    if string_find(msg, "TM=") then
        local isTank = string_sub(msg, 4, 4) == "1"
        GP_TankPlayers[sender] = isTank or nil
    end
end

function NanamiPlates_Threat.GetTWTankModeThreat(mobGUID, mobName)
    local playerName = UnitName("player")

    if mobGUID then
        local data = GP_TankModeThreats[mobGUID]
        if data then
            local playerHasAggro = (data.name == playerName)
            return true, playerHasAggro, data.name, data.perc or 0
        end
    end

    if mobName then
        for guid, data in pairs(GP_TankModeThreats) do
            if data.creature == mobName then
                local playerHasAggro = (data.name == playerName)
                return true, playerHasAggro, data.name, data.perc or 0
            end
        end
    end

    return false, false, nil, 0
end

function NanamiPlates_Threat.GetGPThreatData()
    local playerName = UnitName("player")
    local playerPct = 0
    local highestOtherPct = 0
    local hasData = false
    local threatHolderName = nil

    for name, data in pairs(GP_Threats) do
        hasData = true
        local pct = data.perc or 0
        if name == playerName then
            playerPct = pct
        else
            if pct > highestOtherPct then highestOtherPct = pct end
        end
        if pct >= 100 then threatHolderName = name end
    end

    return hasData, (playerPct >= 100), playerPct, highestOtherPct, threatHolderName
end

function NanamiPlates_Threat.IsInPlayerGroup(unit)
    if not unit or not UnitExists(unit) then return false end
    if UnitIsUnit(unit, "player") then return true end

    for i = 1, 4 do
        if UnitIsUnit(unit, "party" .. i) then return true end
    end
    if UnitInRaid("player") then
        for i = 1, 40 do
            if UnitIsUnit(unit, "raid" .. i) then return true end
        end
    end
    if UnitIsUnit(unit, "pet") then return true end
    for i = 1, 4 do
        if UnitIsUnit(unit, "partypet" .. i) then return true end
    end

    return false
end

local NP_ThreatFrame = CreateFrame("Frame")
NP_ThreatFrame:RegisterEvent("CHAT_MSG_ADDON")
NP_ThreatFrame:RegisterEvent("PARTY_MEMBERS_CHANGED")
NP_ThreatFrame:RegisterEvent("RAID_ROSTER_UPDATE")
NP_ThreatFrame:RegisterEvent("ZONE_CHANGED_NEW_AREA")
NP_ThreatFrame:RegisterEvent("PLAYER_ENTERING_WORLD")
NP_ThreatFrame:SetScript("OnEvent", function()
    if event == "CHAT_MSG_ADDON" then
        local prefix = arg1
        local msg = arg2 or ""
        local sender = arg4

        if string_find(msg, "TMTv1=") then GP_HandleTankModePacket(msg) end
        if string_find(msg, "TWTv4=") then GP_HandleThreatPacket(msg) end

        if prefix == NP_ADDON_PREFIX and msg and sender then
            GP_HandleTankModeMessage(sender, msg)
        end
    elseif event == "PARTY_MEMBERS_CHANGED" or event == "RAID_ROSTER_UPDATE"
           or event == "ZONE_CHANGED_NEW_AREA" or event == "PLAYER_ENTERING_WORLD" then
        NanamiPlates_Threat.BroadcastTankMode(true)
    end
end)

NanamiPlates.Threat = NanamiPlates_Threat