local function zButtonPet_GetRoot()
	return MTH_ZH_GetSavedRoot()
end

local root = zButtonPet_GetRoot()

-- Initialize with defaults only if not already configured
if not root["zButtonPet"] then
	root["zButtonPet"] = {}
	root["zButtonPet"]["pet"] = {}
	root["zButtonPet"]["pet"]["happiness"] = nil
	root["zButtonPet"]["pet"]["status"] = nil
	root["zButtonPet"]["pet"]["dead"] = nil
	root["zButtonPet"]["spells"] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
	root["zButtonPet"]["rows"] = 1
	root["zButtonPet"]["horizontal"] = nil
	root["zButtonPet"]["vertical"] = nil
	root["zButtonPet"]["firstbutton"] = "RIGHT"
	root["zButtonPet"]["enabled"] = 1
	root["zButtonPet"]["tooltip"] = 1
	root["zButtonPet"]["parent"] = {}
	root["zButtonPet"]["parent"]["size"] = 36
	root["zButtonPet"]["parent"]["hide"] = nil
	root["zButtonPet"]["parent"]["circle"] = 1
	root["zButtonPet"]["children"] = {}
	root["zButtonPet"]["children"]["size"] = 36
	root["zButtonPet"]["children"]["hideonclick"] = 1
end
root["zButtonPet"]["food"] = {}

ZHunterMod_Pet_Spells = {
	ZHUNTER_PET_EYES,
	ZHUNTER_PET_DISMISS,
	ZHUNTER_PET_MEND,
	ZHUNTER_PET_FEED,
	ZHUNTER_PET_CALL,
	ZHUNTER_PET_REVIVE,
	ZHUNTER_PET_LORE,
	ZHUNTER_PET_TRAINING,
	ZHUNTER_PET_TAMING,
	ZHUNTER_PET_POSITION
}

local ZHUNTER_PET_MAX = table.getn(ZHunterMod_Pet_Spells)

local function zButtonPet_GetSaved()
	local currentRoot = zButtonPet_GetRoot()
	if not currentRoot["zButtonPet"] then
		currentRoot["zButtonPet"] = {}
	end
	return currentRoot["zButtonPet"]
end

local function zButtonPet_EnsureConfig()
	local saved = zButtonPet_GetSaved()
	saved["count"] = nil
	if not saved["pet"] then
		saved["pet"] = {}
	end
	if saved["pet"]["happiness"] == nil then
		saved["pet"]["happiness"] = nil
	end
	if saved["pet"]["status"] == nil then
		saved["pet"]["status"] = nil
	end
	if saved["pet"]["dead"] == nil then
		saved["pet"]["dead"] = nil
	end
	if not saved["parent"] then
		saved["parent"] = {}
	end
	if saved["parent"]["size"] == nil then
		saved["parent"]["size"] = 36
	end
	if saved["parent"]["hide"] == nil then
		saved["parent"]["hide"] = nil
	end
	if saved["parent"]["circle"] == nil then
		saved["parent"]["circle"] = 1
	end
	if saved["enabled"] == nil then
		saved["enabled"] = 1
	end
	if saved["tooltip"] == nil then
		saved["tooltip"] = 1
	end
	if saved["rows"] == nil then
		saved["rows"] = 1
	end
	if saved["horizontal"] == nil then
		saved["horizontal"] = nil
	end
	if saved["vertical"] == nil then
		saved["vertical"] = nil
	end
	if saved["firstbutton"] == nil then
		saved["firstbutton"] = "RIGHT"
	end
	if not saved["children"] then
		saved["children"] = {}
	end
	if saved["children"]["size"] == nil then
		saved["children"]["size"] = 36
	end
	if saved["children"]["hideonclick"] == nil then
		saved["children"]["hideonclick"] = 1
	end
	if saved["food"] == nil then
		saved["food"] = {}
	end
	if not saved["spells"] then
		saved["spells"] = {}
	end
	if not saved["visible"] then
		saved["visible"] = {}
	end
	for i = 1, ZHUNTER_PET_MAX do
		if not tonumber(saved["spells"][i]) then
			saved["spells"][i] = i
		end
		if saved["visible"][i] == nil then
			saved["visible"][i] = 1
		end
	end
end

local function zButtonPet_ApplyRuntimeSettings()
	if not zButtonPet then
		return
	end
	local saved = zButtonPet_GetSaved()
	zButtonPet.tooltip = saved["tooltip"] and true or false
	zButtonPet.hideonclick = saved["children"] and saved["children"]["hideonclick"] and true or false
end

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

function zButtonPet_OnEvent()
	if event == "VARIABLES_LOADED" then
		if not zButtonPet then
			return
		end
		if UnitClass("player") ~= ZHUNTER_HUNTER then
			zButtonPet:UnregisterAllEvents()
			zButtonPet:Hide()
			return
		end
		zButtonPet_CreateButtons()
		zButtonPet.beforeclick = zButtonPetAdjustment_BeforeClick
		zButtonPet.afterclick = zButtonPet_AfterClick
		zButtonPetAdjustment = CreateFrame("Frame", "zButtonPetAdjustment")
		zButtonPetAdjustment:RegisterEvent("UNIT_HEALTH")
		zButtonPetAdjustment:RegisterEvent("UNIT_HAPPINESS")
		zButtonPetAdjustment:RegisterEvent("UNIT_PET")
		zButtonPetAdjustment:RegisterEvent("PET_BAR_UPDATE")
		zButtonPetAdjustment:RegisterEvent("PLAYER_ENTERING_WORLD")
		zButtonPetAdjustment:RegisterEvent("SPELLS_CHANGED")
		zButtonPetAdjustment:SetScript("OnEvent", zButtonPetAdjustment_OnEvent)
		zButtonPet_Tooltip = CreateFrame("GameTooltip", "zButtonPet_Tooltip", nil, "GameTooltipTemplate")
		zButtonPet_SetupSizeAndPosition()
		zButtonPetAdjustment_OnEvent()
	end
end

function zButtonPet_CreateButtons()
	zButtonPet_EnsureConfig()
	local saved = zButtonPet_GetSaved()
	
	ZSpellButton_CreateChildren(zButtonPet, "zButtonPet", ZHUNTER_PET_MAX)
	local info = {}
	local infoIndex = 1
	for i=1, table.getn(ZHunterMod_Pet_Spells) do
		if not tonumber(saved["spells"][i]) then
			info = ZHunterMod_Pet_Spells
			saved["spells"] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
			break
		end
		local spellIndex = saved["spells"][i]
		if saved["visible"][spellIndex] ~= false then
			info[infoIndex] = ZHunterMod_Pet_Spells[spellIndex]
			infoIndex = infoIndex + 1
		end
	end
	zButtonPet.found = ZSpellButton_SetButtons(zButtonPet, info)
	zButtonPet_ApplyRuntimeSettings()
end

function zButtonPet_SetupSizeAndPosition()
	local saved = zButtonPet_GetSaved()
	if saved["enabled"] == false or saved["enabled"] == 0 then
		if zButtonPet and zButtonPet.Hide then
			zButtonPet:Hide()
		end
		return
	end
	local displayCount = zButtonPet.found or ZHUNTER_PET_MAX
	if displayCount < 0 then
		displayCount = 0
	end
	ZSpellButton_SetSize(zButtonPet, saved["parent"]["size"])
	ZSpellButton_SetSize(zButtonPet, saved["children"]["size"], 1)
	ZSpellButton_SetExpandDirection(zButtonPet, saved["firstbutton"])
	ZSpellButton_ArrangeChildren(zButtonPet, saved["rows"], 
		displayCount, saved["horizontal"],
		saved["vertical"])
end

function zButtonPet_Reset()
	local currentRoot = zButtonPet_GetRoot()
	currentRoot["zButtonPet"] = {}
	local saved = zButtonPet_GetSaved()
	saved["pet"] = {}
	saved["pet"]["happiness"] = nil
	saved["pet"]["status"] = nil
	saved["pet"]["dead"] = nil
	saved["spells"] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
	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
	saved["visible"] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
	zButtonPet_EnsureConfig()
end

function IsPetDead()
	local saved = zButtonPet_GetSaved()
	return saved["pet"] and saved["pet"]["dead"]
end

local function zButtonPet_GetCorePetInfo()
	if type(MTH_GetCurrentPetInfo) == "function" then
		local info = MTH_GetCurrentPetInfo()
		if type(info) == "table" then
			return info
		end
	end
	return nil
end

local function zButtonPet_RefreshSavedPetState(saved, corePetInfo)
	local hasLivePet = false
	if type(UnitExists) == "function" then
		hasLivePet = UnitExists("pet") and true or false
	elseif type(corePetInfo) == "table" and corePetInfo.liveExists ~= nil then
		hasLivePet = corePetInfo.liveExists and true or false
	end

	if not hasLivePet then
		saved["pet"]["status"] = nil
		saved["pet"]["dead"] = nil
		saved["pet"]["happiness"] = nil
		return false
	end

	local currentHealth = (corePetInfo and tonumber(corePetInfo.health)) or (type(UnitHealth) == "function" and UnitHealth("pet")) or nil
	local currentHealthMax = (corePetInfo and tonumber(corePetInfo.healthMax)) or (type(UnitHealthMax) == "function" and UnitHealthMax("pet")) or nil
	local isDead = (corePetInfo and corePetInfo.dead) and true or false
	if not isDead and type(UnitIsDead) == "function" then
		isDead = UnitIsDead("pet") and true or false
	end
	if isDead then
		saved["pet"]["dead"] = 1
	else
		saved["pet"]["dead"] = nil
	end

	local happiness = corePetInfo and corePetInfo.happiness or nil
	if happiness == nil and type(GetPetHappiness) == "function" then
		happiness = GetPetHappiness()
	end
	saved["pet"]["happiness"] = happiness

	if isDead then
		saved["pet"]["status"] = 1
	elseif currentHealth and currentHealthMax and currentHealthMax > 0 then
		if (currentHealth / currentHealthMax) > 0.75 then
			saved["pet"]["status"] = 2
		else
			saved["pet"]["status"] = 1
		end
	else
		saved["pet"]["status"] = 2
	end

	return true
end

local function zButtonPet_FindSpellIdByName(spellName)
	if not spellName or spellName == "" then
		return nil
	end
	local maxSpells = tonumber((_G and _G["MAX_SPELLS"]) or nil) or 1024
	for i = 1, maxSpells do
		local current = GetSpellName(i, "spell")
		if not current then
			break
		end
		if current == spellName then
			return i
		end
	end
	return nil
end

function zButtonPetAdjustment_BeforeClick()
	if CursorHasItem() then
		DropItemOnUnit("pet")
		return 1
	end
end

local function zButtonPet_RefreshParentSpell()
	if not zButtonPet or not zButtonPet.count then
		return
	end
	zButtonPet_EnsureConfig()
	local saved = zButtonPet_GetSaved()
	local corePetInfo = zButtonPet_GetCorePetInfo()
	local hasCurrentPet = nil
	local hasLivePet = nil
	if type(corePetInfo) == "table" and corePetInfo.exists ~= nil then
		hasCurrentPet = corePetInfo.exists and true or false
	end
	if type(corePetInfo) == "table" and corePetInfo.liveExists ~= nil then
		hasLivePet = corePetInfo.liveExists and true or false
	end
	zButtonPet_RefreshSavedPetState(saved, corePetInfo)

	local status, happiness, dead
	local spells = {}
	local name
	local choice
	for i=1, zButtonPet.count do
		local button
		button = getglobal(zButtonPet.name..i)
		if button and button.id then
			name = GetSpellName(button.id, "spell")
			spells[name] = button
			if not choice and (name == ZHUNTER_PET_DISMISS or name == ZHUNTER_PET_EYES or name == ZHUNTER_PET_POSITION) then
				choice = button
			end
		end
	end
	status = saved["pet"]["status"]
	happiness = saved["pet"]["happiness"]
	dead = saved["pet"]["dead"]
	local id = zButtonPet.id
	name = nil

	if hasCurrentPet == false and hasLivePet == false then
		name = ZHUNTER_PET_TAMING
	elseif not status then
		name = ZHUNTER_PET_CALL
	elseif dead then
		name = ZHUNTER_PET_REVIVE
	elseif status == 1 then
		name = ZHUNTER_PET_MEND
	elseif happiness ~= 3 then
		name = ZHUNTER_PET_FEED
	elseif choice then
		id = choice.id
	end

	if name and spells[name] then
		id = spells[name].id
	elseif name then
		local fallbackId = zButtonPet_FindSpellIdByName(name)
		if fallbackId then
			id = fallbackId
		end
	end
	zButtonPet.id = id
	ZSpellButton_UpdateButton(zButtonPet)
	ZSpellButton_UpdateCooldown(zButtonPet)
	if GameTooltip:IsOwned(zButtonPet) then
		ZSpellButtonParent_OnEnter(zButtonPet)
	end
end

function zButtonPet_AfterClick()
	zButtonPet_RefreshParentSpell()
end

function zButtonPet_RefreshLiveState(_liveState, _source)
	zButtonPet_RefreshParentSpell()
end

function zButtonPetAdjustment_OnEvent()
	if not zButtonPet or not zButtonPet.count then
		return
	end

	if (event == "UNIT_HEALTH" or event == "UNIT_HAPPINESS") and arg1 and arg1 ~= "pet" then
		return
	end
	if event == "UNIT_PET" and arg1 and arg1 ~= "player" then
		return
	end
	zButtonPet_RefreshParentSpell()
end

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

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

function zButtonPet_FeedPet()

end

SLASH_zButtonPet1 = "/ZPet"
SlashCmdList["zButtonPet"] = function(msg)
	if MTH_ZH_HandleDisabledSlash and MTH_ZH_HandleDisabledSlash("Pet button is disabled while module 'zhunter' is disabled.") then
		return
	end
	if msg == "reset" then
		zButtonPet_Reset()
		zButtonPet:ClearAllPoints()
		zButtonPet:SetPoint("CENTER", UIParent, "CENTER", 0, 60)
	elseif msg == "options" then
		MTH_OpenOptions("Pet")
	else
		MTH_ZH_Print("Possible Commands: \"options\", \"reset\"")
	end
end