local addonName, ns = ...
local L = ns.L
local W = ns.Widgets

local RangeLib = LibStub("LibRangeCheck-3.0", true)

local inCombat = false

local FRAME_BACKDROP = {
    bgFile = "Interface\\Tooltips\\UI-Tooltip-Background",
    edgeFile = "Interface\\Tooltips\\UI-Tooltip-Border",
    tile = true, tileSize = 16, edgeSize = 16,
    insets = { left = 4, right = 4, top = 4, bottom = 4 },
}

local function HasAttackableTarget()
    if not UnitExists("target") then return false end
    if not UnitCanAttack("player", "target") then return false end
    if UnitIsDeadOrGhost("target") then return false end
    return true
end

local function HasValidTarget()
    if not UnitExists("target") then return false end
    if UnitIsDeadOrGhost("target") then return false end
    if not UnitCanAttack("player", "target") and not UnitCanAssist("player", "target") then return false end
    return true
end

local MAX_RANGE_BRACKET = 40

local function GetColorForRange(minRange)
    local db = NaowhQOL.rangeCheck
    if not db or not db.rangeColors then
        return db and db.rangeColorR or 0.01, db and db.rangeColorG or 0.56, db and db.rangeColorB or 0.91
    end
    local bracket = math.min(MAX_RANGE_BRACKET, math.floor((minRange or 0) / 5) * 5)
    local color = db.rangeColors[bracket] or db.rangeColors[0]
    if color then
        return color.r, color.g, color.b
    end
    return 0.01, 0.56, 0.91
end

local rangeFrame = CreateFrame("Frame", "NaowhQOL_RangeToTarget", UIParent, "BackdropTemplate")
rangeFrame:SetSize(200, 40)
rangeFrame:SetPoint("CENTER", UIParent, "CENTER", 0, -190)
rangeFrame:Hide()

local rangeLabel = rangeFrame:CreateFontString(nil, "OVERLAY")
rangeLabel:SetFont(ns.DefaultFontPath(), 24, "OUTLINE")
rangeLabel:SetPoint("CENTER")

local rangeResizeHandle

function rangeFrame:UpdateDisplay()
    local db = NaowhQOL.rangeCheck
    if not db then return end

    if not db.enabled or not db.rangeEnabled then
        rangeFrame:SetBackdrop(nil)
        if rangeResizeHandle then rangeResizeHandle:Hide() end
        rangeFrame:Hide()
        return
    end

    if db.rangeUnlock then
        rangeFrame:SetBackdrop(FRAME_BACKDROP)
        rangeFrame:SetBackdropColor(0.1, 0.1, 0.1, 0.8)
        rangeFrame:SetBackdropBorderColor(0.4, 0.4, 0.4, 1)
        rangeFrame:EnableMouse(true)
        if rangeResizeHandle then rangeResizeHandle:Show() end
        rangeFrame:Show()
    else
        rangeFrame:SetBackdrop(nil)
        rangeFrame:EnableMouse(false)
        if rangeResizeHandle then rangeResizeHandle:Hide() end
    end

    if not rangeFrame.initialized then
        rangeFrame:ClearAllPoints()
        local point = db.rangePoint or "CENTER"
        local x = db.rangeX or 0
        local y = db.rangeY or -190
        rangeFrame:SetPoint(point, UIParent, point, x, y)
        rangeFrame:SetSize(db.rangeWidth or 200, db.rangeHeight or 40)
        rangeFrame.initialized = true
    end

    local fontPath = ns.Media.ResolveFont(db.rangeFont)
    local frameH = rangeFrame.isResizing and rangeFrame:GetHeight() or (db.rangeHeight or 40)
    local fontSize = math.max(10, math.min(72, math.floor(frameH * 0.55)))
    local ok = rangeLabel:SetFont(fontPath, fontSize, "OUTLINE")
    if not ok then
        rangeLabel:SetFont(ns.DefaultFontPath(), fontSize, "OUTLINE")
    end
end

local TICK_RATE = 0.1
local tickAcc = 0

local function TickRangeCheck()
    local db = NaowhQOL.rangeCheck
    if not db or not db.enabled then
        rangeFrame:Hide()
        return
    end

    if not RangeLib then
        rangeFrame:Hide()
        return
    end

    local hasTarget = db.includeFriendlies and HasValidTarget() or HasAttackableTarget()

    if db.rangeEnabled and hasTarget then
        if db.rangeCombatOnly and not inCombat and not db.rangeUnlock then
            rangeFrame:Hide()
        else
            local minRange, maxRange = RangeLib:GetRange("target")
            local suffix = db.hideSuffix and "" or " yd"
            if minRange and maxRange then
                rangeLabel:SetText(minRange .. "-" .. maxRange .. suffix)
            elseif maxRange then
                rangeLabel:SetText("0-" .. maxRange .. suffix)
            elseif minRange then
                rangeLabel:SetText(minRange .. "+" .. suffix)
            else
                rangeLabel:SetText("--" .. suffix)
            end
            rangeLabel:SetTextColor(GetColorForRange(minRange))
            if not db.rangeUnlock then
                rangeFrame:Show()
            end
        end
    else
        if not db.rangeUnlock then
            rangeFrame:Hide()
        end
    end
end

local tickFrame = CreateFrame("Frame")
tickFrame:SetScript("OnUpdate", ns.PerfMonitor:Wrap("Range Check", function(self, elapsed)
    tickAcc = tickAcc + elapsed
    if tickAcc < TICK_RATE then return end
    tickAcc = 0
    TickRangeCheck()
end))

local loader = CreateFrame("Frame")
loader:RegisterEvent("PLAYER_LOGIN")
loader:RegisterEvent("PLAYER_REGEN_DISABLED")
loader:RegisterEvent("PLAYER_REGEN_ENABLED")
loader:RegisterEvent("PLAYER_TARGET_CHANGED")

loader:SetScript("OnEvent", function(self, event)
    local db = NaowhQOL.rangeCheck
    if not db then return end

    if event == "PLAYER_LOGIN" then
        inCombat = UnitAffectingCombat("player")

        if not RangeLib then
            RangeLib = LibStub("LibRangeCheck-3.0", true)
        end

        db.rangeWidth = db.rangeWidth or 200
        db.rangeHeight = db.rangeHeight or 40
        db.rangePoint = db.rangePoint or "CENTER"
        db.rangeX = db.rangeX or 0
        db.rangeY = db.rangeY or -190

        W.MakeDraggable(rangeFrame, {
            db = db,
            unlockKey = "rangeUnlock",
            pointKey = "rangePoint", xKey = "rangeX", yKey = "rangeY",
        })
        rangeResizeHandle = W.CreateResizeHandle(rangeFrame, {
            db = db,
            unlockKey = "rangeUnlock",
            widthKey = "rangeWidth", heightKey = "rangeHeight",
            minW = 75, minH = 10,
            onResize = function() rangeFrame:UpdateDisplay() end,
        })

        rangeFrame.initialized = false
        C_Timer.After(0, function()
            rangeFrame:UpdateDisplay()
        end)

        ns.SettingsIO:RegisterRefresh("rangeCheck", function()
            rangeFrame:UpdateDisplay()
        end)
        return
    end

    if event == "PLAYER_REGEN_DISABLED" then
        inCombat = true
    elseif event == "PLAYER_REGEN_ENABLED" then
        inCombat = false
    end

    tickAcc = TICK_RATE
end)

ns.RangeCheckRangeFrame = rangeFrame
