local function zButtonMounts_GetRoot()
	return MTH_ZH_GetSavedRoot()
end

local root = zButtonMounts_GetRoot()
if not root["zButtonMounts"] then
	root["zButtonMounts"] = {}
	root["zButtonMounts"]["spells"] = {}
	root["zButtonMounts"]["rows"] = 1
	root["zButtonMounts"]["horizontal"] = nil
	root["zButtonMounts"]["vertical"] = nil
	root["zButtonMounts"]["firstbutton"] = "RIGHT"
	root["zButtonMounts"]["enabled"] = 0
	root["zButtonMounts"]["tooltip"] = 1
	root["zButtonMounts"]["parent"] = {}
	root["zButtonMounts"]["parent"]["size"] = 36
	root["zButtonMounts"]["parent"]["hide"] = nil
	root["zButtonMounts"]["parent"]["circle"] = 1
	root["zButtonMounts"]["children"] = {}
	root["zButtonMounts"]["children"]["size"] = 36
	root["zButtonMounts"]["children"]["hideonclick"] = 1
end

local ZHUNTER_MOUNTS_BUTTON_MAX = 80
local zButtonMounts_LastSpellSignature = nil
local zButtonMounts_LastRefreshAt = 0
local zButtonMounts_MinRefreshInterval = 0.50

local function zButtonMounts_GetSpellSignature(spellIds)
	if type(spellIds) ~= "table" or table.getn(spellIds) == 0 then
		return ""
	end
	local parts = {}
	for i = 1, table.getn(spellIds) do
		parts[i] = tostring(spellIds[i] or "")
	end
	return table.concat(parts, ",")
end

local function zButtonMounts_GetSaved()
	local currentRoot = zButtonMounts_GetRoot()
	if not currentRoot["zButtonMounts"] then
		currentRoot["zButtonMounts"] = {}
	end
	return currentRoot["zButtonMounts"]
end

local function zButtonMounts_EnsureConfig()
	local saved = zButtonMounts_GetSaved()
	saved["count"] = nil
	if saved["enabled"] == nil then
		saved["enabled"] = 0
	end
	if saved["tooltip"] == nil then
		saved["tooltip"] = 1
	end
	if not saved["children"] then
		saved["children"] = {}
	end
	if saved["children"]["hideonclick"] == nil then
		saved["children"]["hideonclick"] = 1
	end
	if not saved["spells"] then
		saved["spells"] = {}
	end
	if not saved["parent"] then
		saved["parent"] = {}
	end
	if not saved["children"] then
		saved["children"] = {}
	end
	if not saved["parent"]["size"] then
		saved["parent"]["size"] = 36
	end
	if saved["parent"]["circle"] == nil then
		saved["parent"]["circle"] = 1
	end
	if saved["parent"]["random"] == nil then
		saved["parent"]["random"] = false
	end
	if saved["parent"]["aqfilter"] == nil then
		saved["parent"]["aqfilter"] = true
	end
	if not saved["children"]["size"] then
		saved["children"]["size"] = 36
	end
	if not saved["rows"] or saved["rows"] < 1 then
		saved["rows"] = 1
	end
	if not saved["firstbutton"] then
		saved["firstbutton"] = "RIGHT"
	end
end

local function zButtonMounts_ApplyRuntimeSettings()
	if not zButtonMounts then
		return
	end
	local saved = zButtonMounts_GetSaved()
	zButtonMounts.tooltip = saved["tooltip"] and true or false
	zButtonMounts.hideonclick = saved["children"] and saved["children"]["hideonclick"] and true or false
	zButtonMounts.expandonhover = saved["children"] and saved["children"]["expandonhover"] and true or false
	zButtonMounts.fadetimer = saved["children"] and tonumber(saved["children"]["fadetimer"]) or 0
end

local function zButtonMounts_NormalizeTabName(value)
	local text = string.lower(tostring(value or ""))
	text = string.gsub(text, "%s+", "")
	text = string.gsub(text, "[^%a]", "")
	while string.sub(text, 1, 1) == "z" and string.len(text) > 1 do
		text = string.sub(text, 2)
	end
	return text
end

local function zButtonMounts_FindTabBounds()
	if type(GetNumSpellTabs) ~= "function" or type(GetSpellTabInfo) ~= "function" then
		return nil, nil
	end
	local tabCount = GetNumSpellTabs() or 0
	for tabIndex = 1, tabCount do
		local tabName, _, tabOffset, tabEntries = GetSpellTabInfo(tabIndex)
		local normalized = zButtonMounts_NormalizeTabName(tabName)
		if string.find(normalized, "mount", 1, true) then
			return tonumber(tabOffset) or 0, tonumber(tabEntries) or 0
		end
	end
	return nil, nil
end

local function zButtonMounts_CollectTabSpellIds()
	local tabOffset, tabEntries = zButtonMounts_FindTabBounds()
	if not tabOffset or not tabEntries or tabEntries <= 0 then
		return {}
	end

	local spellIds = {}
	local bookType = BOOKTYPE_SPELL or "spell"
	local maxIndex = tabOffset + tabEntries
	for spellIndex = tabOffset + 1, maxIndex do
		local spellName = GetSpellName(spellIndex, bookType)
		if spellName and spellName ~= "" then
			table.insert(spellIds, spellIndex)
		end
	end
	return spellIds
end

local function zButtonMounts_ApplySpellIds(spellIds)
	if not zButtonMounts then
		return 0
	end

	local parent = zButtonMounts
	local childCount = parent.count or ZHUNTER_MOUNTS_BUTTON_MAX

	for i = 1, childCount do
		local child = getglobal("zButtonMounts" .. i)
		if child then
			child:Hide()
			child.id = nil
			child.icon = nil
			child.isspell = nil
		end
	end

	local found = 0
	for i = 1, table.getn(spellIds) do
		if found >= childCount then
			break
		end
		local spellId = spellIds[i]
		if spellId then
			found = found + 1
			local child = getglobal("zButtonMounts" .. found)
			if child then
				child.id = spellId
				child.isspell = 1
				ZSpellButton_UpdateButton(child)
				child:Show()
			end
		end
	end

	if found > 0 then
		local saved = zButtonMounts_GetSaved()
		if saved["parent"]["random"] and found > 1 then
			local pick = math.random(1, found)
			local child = getglobal("zButtonMounts" .. pick)
			parent.id = child and child.id or spellIds[1]
		else
			parent.id = spellIds[1]
		end
		parent.isspell = 1
		ZSpellButton_UpdateButton(parent)
		parent:Enable()
		parent:Show()
	else
		parent.id = nil
		parent:Hide()
	end

	return found
end

local function zButtonMounts_IsQirajiSpell(spellId)
	local bookType = BOOKTYPE_SPELL or "spell"
	local name = GetSpellName(spellId, bookType)
	if name and string.find(string.lower(name), "qiraji", 1, true) then
		return true
	end
	return false
end

local function zButtonMounts_IsInAQ40()
	local zone = GetRealZoneText and GetRealZoneText() or ""
	if zone == "Temple of Ahn'Qiraj" or zone == "Ahn'Qiraj" then
		return true
	end
	return false
end

local function zButtonMounts_FilterAQ(spellIds)
	local saved = zButtonMounts_GetSaved()
	if not saved["parent"]["aqfilter"] then
		return spellIds
	end
	local inAQ = zButtonMounts_IsInAQ40()
	local filtered = {}
	for i = 1, table.getn(spellIds) do
		local isQiraji = zButtonMounts_IsQirajiSpell(spellIds[i])
		if inAQ then
			if isQiraji then
				table.insert(filtered, spellIds[i])
			end
		else
			if not isQiraji then
				table.insert(filtered, spellIds[i])
			end
		end
	end
	-- Fallback: if filtering removed everything, return original list
	if table.getn(filtered) == 0 then
		return spellIds
	end
	return filtered
end

local function zButtonMounts_RefreshSpells()
	if not zButtonMounts then
		return 0
	end
	local saved = zButtonMounts_GetSaved()
	local spellIds = zButtonMounts_CollectTabSpellIds()
	local spellNames = {}
	local bookType = BOOKTYPE_SPELL or "spell"
	for i = 1, table.getn(spellIds) do
		local n = GetSpellName(spellIds[i], bookType)
		if n and n ~= "" then
			table.insert(spellNames, n)
		end
	end
	saved["spellIds"] = spellIds
	saved["spells"] = spellNames
	zButtonMounts.spells = spellNames
	spellIds = zButtonMounts_FilterAQ(spellIds)
	zButtonMounts.found = zButtonMounts_ApplySpellIds(spellIds)
	zButtonMounts_ApplyRuntimeSettings()
	return zButtonMounts.found or 0
end

function zButtonMounts_OnLoad()
	this:RegisterEvent("VARIABLES_LOADED")
end

function zButtonMounts_OnEvent()
	if event == "VARIABLES_LOADED" then
		if not zButtonMounts then
			return
		end
		if UnitClass("player") ~= ZHUNTER_HUNTER then
			zButtonMounts:UnregisterAllEvents()
			zButtonMounts:Hide()
			return
		end
		zButtonMounts_CreateButtons()
		zButtonMounts.afterclick = function(button)
			local saved = zButtonMounts_GetSaved()
			if saved["parent"]["random"] and zButtonMounts.found and zButtonMounts.found > 1 then
				local pick = math.random(1, zButtonMounts.found)
				local child = getglobal("zButtonMounts" .. pick)
				if child and child.id then
					zButtonMounts.id = child.id
					ZSpellButton_UpdateButton(zButtonMounts)
				end
			end
		end
		MTH_ZH_MountsAdjust = CreateFrame("Frame", "MTH_ZH_MountsAdjust")
		MTH_ZH_MountsAdjust:RegisterEvent("SPELLS_CHANGED")
		MTH_ZH_MountsAdjust:RegisterEvent("PLAYER_ENTERING_WORLD")
		MTH_ZH_MountsAdjust:RegisterEvent("ZONE_CHANGED_NEW_AREA")
		MTH_ZH_MountsAdjust:SetScript("OnEvent", MTH_ZH_MountsAdjust_OnEvent)
		zButtonMounts_SetupSizeAndPosition()
	end
end

function zButtonMounts_CreateButtons()
	zButtonMounts_EnsureConfig()

	if not zButtonMounts._mthChildrenCreated then
		ZSpellButton_CreateChildren(zButtonMounts, "zButtonMounts", ZHUNTER_MOUNTS_BUTTON_MAX)
		zButtonMounts._mthChildrenCreated = 1
	end

	zButtonMounts_RefreshSpells()
end

function zButtonMounts_SetupSizeAndPosition()
	local saved = zButtonMounts_GetSaved()
	if saved["enabled"] == false or saved["enabled"] == 0 then
		if MTH_ZH_MountsAdjust then
			MTH_ZH_MountsAdjust:UnregisterAllEvents()
			MTH_ZH_MountsAdjust:SetScript("OnEvent", nil)
		end
		if zButtonMounts and zButtonMounts.Hide then
			zButtonMounts:Hide()
		end
		return
	end
	if MTH_ZH_MountsAdjust then
		MTH_ZH_MountsAdjust:RegisterEvent("SPELLS_CHANGED")
		MTH_ZH_MountsAdjust:RegisterEvent("PLAYER_ENTERING_WORLD")
		MTH_ZH_MountsAdjust:RegisterEvent("ZONE_CHANGED_NEW_AREA")
		MTH_ZH_MountsAdjust:SetScript("OnEvent", MTH_ZH_MountsAdjust_OnEvent)
	end
	local displayCount = zButtonMounts.found or 0
	if displayCount < 0 then
		displayCount = 0
	end
	if not (type(MTH_ZBar_ApplyToButton) == "function" and MTH_ZBar_ApplyToButton(zButtonMounts, displayCount)) then
		ZSpellButton_SetSize(zButtonMounts, saved["parent"]["size"])
		ZSpellButton_SetSize(zButtonMounts, saved["children"]["size"], 1)
		ZSpellButton_SetExpandDirection(zButtonMounts, saved["firstbutton"])
		ZSpellButton_ArrangeChildren(zButtonMounts, saved["rows"],
			displayCount, saved["horizontal"],
			saved["vertical"])
	end
end

function zButtonMounts_Reset()
	local currentRoot = zButtonMounts_GetRoot()
	currentRoot["zButtonMounts"] = {}
	local saved = zButtonMounts_GetSaved()
	saved["spells"] = {}
	saved["rows"] = 1
	saved["horizontal"] = nil
	saved["vertical"] = nil
	saved["firstbutton"] = "RIGHT"
	saved["enabled"] = 1
	saved["tooltip"] = 1
	saved["parent"] = {}
	saved["parent"]["size"] = 36
	saved["parent"]["hide"] = nil
	saved["parent"]["circle"] = 1
	saved["children"] = {}
	saved["children"]["size"] = 36
	saved["children"]["hideonclick"] = 1
	zButtonMounts_EnsureConfig()
end

function MTH_ZH_MountsAdjust_OnEvent()
	if not zButtonMounts then
		return
	end
	if event == "SPELLS_CHANGED" then
		local now = GetTime and GetTime() or 0
		if now > 0 and zButtonMounts_LastRefreshAt > 0 and (now - zButtonMounts_LastRefreshAt) < zButtonMounts_MinRefreshInterval then
			return
		end
		local signature = zButtonMounts_GetSpellSignature(zButtonMounts_CollectTabSpellIds())
		if signature == zButtonMounts_LastSpellSignature and not GameTooltip:IsOwned(zButtonMounts) then
			return
		end
		zButtonMounts_LastSpellSignature = signature
		zButtonMounts_LastRefreshAt = now
	end
	zButtonMounts_RefreshSpells()
	zButtonMounts_SetupSizeAndPosition()
	if GameTooltip:IsOwned(zButtonMounts) then
		ZSpellButtonParent_OnEnter(zButtonMounts)
	end
end

function zButtonMounts_KeyBinding(index)
	if MTH_ZH_IsModuleEnabled and not MTH_ZH_IsModuleEnabled() then
		return
	end

	local button
	if index then
		button = getglobal("zButtonMounts"..index)
	else
		button = zButtonMounts
	end
	if button and button.id then
		CastSpell(button.id, "spell")
		if zButtonMounts.hideonclick then
			if type(ZSpellButton_SetChildrenExpanded) == "function" then
				ZSpellButton_SetChildrenExpanded(zButtonMounts, false)
			elseif zButtonMounts.children then
				zButtonMounts.children:Hide()
			end
		end
	end
end

SLASH_zButtonMounts1 = "/ZMounts"
SlashCmdList["zButtonMounts"] = function(msg)
	if MTH_ZH_HandleDisabledSlash and MTH_ZH_HandleDisabledSlash("Mounts button is disabled while module 'zhunter' is disabled.") then
		return
	end
	if msg == "reset" then
		zButtonMounts_Reset()
		zButtonMounts:ClearAllPoints()
		zButtonMounts:SetPoint("TOP", UIParent, "TOP", 0, -410)
		zButtonMounts_RefreshSpells()
		zButtonMounts_SetupSizeAndPosition()
	else
		MTH_ZH_Print("Possible Commands: \"reset\"")
	end
end