--	DependencyLoader
--	

local addonName, addonTable = ...


local DependencyLoader = LibStub("AceAddon-3.0"):NewAddon(addonName, "AceHook-3.0")
_G[addonName] = DependencyLoader

addonTable.interface = DependencyLoader


local libPrint = LibStub("LibPrint-1.0")
local LibScriptLink = LibStub("LibScriptLink-1.0")

DependencyLoader.printStream = libPrint:NewStream("DependencyLoader", "DpLdr", print)
DependencyLoader.debugStream = libPrint:NewStream("DependencyLoader", "DpLdr", "mcm")


function DependencyLoader:Print(...)
	self.printStream:Print(...)
end


function DependencyLoader:Debug(...)
	self.debugStream:Print(...)
end


function DependencyLoader:OnInitialize()
	self:Debug("Initializing", addonName)
	self:Enable()
end


function DependencyLoader:OnEnable()
	self:Print("Enabled", addonName)
	
	self:Hook("EnableAddOn", true)
	
	self:FixCurrentAddons()
end


function DependencyLoader:OnDisable()
	self:Print("Disabled", addonName)
end


--	Does not consider user settings or addon errata.
function DependencyLoader:IsForceLoadAvailable()
	return IsLoggedIn() and true or false
end


function DependencyLoader:IsForceLoadAllowed()
	--	TODO: check user settings
	return true
end


function DependencyLoader:CanForceLoad()
	return self:IsForceLoadAvailable() and self:IsForceLoadAllowed()
end


--	Enables any dependencies needed by the addons 
--	that have already been enabled
function DependencyLoader:FixCurrentAddons()
	local requestReload = false
	
	for i=1, GetNumAddOns() do
		local addon = addonTable.classes.Addon:Get(i)
		
		--	TODO: what if an addon was loaded but its deps were then disabled?
		if addon:IsEnabled() and not addon:IsLoaded() then
			local tree = addonTable.classes.Tree:Get(addon)
			
			if self:CanForceLoad() and tree:CanForceLoad() then
				tree:ForceLoad()
			elseif tree:CanLoD() then
				tree:PrepareForLoD()
			elseif tree:CanLoad() then
				tree:PrepareForReload()
				requestReload = true
			end
		end
	end
	
	if requestReload then
		local message = LibScriptLink:NewLink(ReloadUI) .. " to reload your UI."
		self:Print(message)
	end
end


function DependencyLoader:EnableAddOn(...)
	print("DependencyLoader:EnableAddOn", ...)
end