local addonName = "Altoholic"
local addon = _G[addonName]
local colors = addon.Colors

local MVC = LibStub("LibMVC-1.0")
local L = DataStore:GetLocale(addonName)

local tab = AltoholicFrame.TabGrids

local view
local viewItems
local isViewValid
local counters = {}

local KEY_ABILITIES = "Abilities"
local KEY_TRAITS = "Traits"
local KEY_COUNTERS = "AbilityCounters"

local currentKey

local function SortByAbility(a, b)
	local nameA = C_Garrison.GetFollowerAbilityName(a)
	local nameB = C_Garrison.GetFollowerAbilityName(b)
	return nameA < nameB
end

local function SortByCounter(a, b)
	local _, nameA = C_Garrison.GetFollowerAbilityCounterMechanicInfo(a)
	local _, nameB = C_Garrison.GetFollowerAbilityCounterMechanicInfo(b)
	
	return nameA < nameB
end

local function AddIDToView(id, isCounter)
	if not id or id == 0 then return end
	
	if isCounter then
		local counterID = C_Garrison.GetFollowerAbilityCounterMechanicInfo(id)
		
		if counterID and not counters[counterID] then	-- if this counter does not exist yet
			counters[counterID] = true		-- add it
			viewItems[id] = true				-- and add this ability to the view (any ability with that counter, it's the counter that matters anyway)
		end
	else
		viewItems[id] = true
	end
end

local function BuildView()
	local followers
	view = {}
	viewItems = {}
	wipe(counters)
	
	local options = Altoholic_GridsTab_Options
	currentKey = options["Garrisons.CurrentStats"]
	
	-- Get a list of all collected followers across all alts on this realm
	for characterKey, character in pairs(DataStore:GetCharacters(tab:GetRealm())) do
		followers = DataStore:GetFollowers(character)
		
		if followers then
			for id, _ in pairs(followers) do
				local _, _, _, ab1, ab2, ab3, ab4, tr1, tr2, tr3, tr4 = DataStore:GetFollowerInfo(character, id)
				
				-- save known abilities only (id <> 0)
				if currentKey == KEY_ABILITIES then
					AddIDToView(ab1)
					AddIDToView(ab2)
					AddIDToView(ab3)
					AddIDToView(ab4)
				elseif currentKey == KEY_TRAITS then
					AddIDToView(tr1)
					AddIDToView(tr2)
					AddIDToView(tr3)
					AddIDToView(tr4)
				elseif currentKey == KEY_COUNTERS then
					AddIDToView(ab1, true)
					AddIDToView(ab2, true)
					AddIDToView(ab3, true)
					AddIDToView(ab4, true)
				end
			end
		end
	end
	
	-- fill the view with view items
	for k, _ in pairs(viewItems) do
		table.insert(view, k)
	end

	-- Now sort the view
	if currentKey == KEY_COUNTERS then
		table.sort(view, SortByCounter)
	else	-- abilities & traits use the same function
		table.sort(view, SortByAbility)
	end
	
	isViewValid = true
end

tab:RegisterGrid(11, {
	InvalidateView = function()
		isViewValid = nil
	end,
	OnUpdate = function() 
			if isViewValid then return end
			
			BuildView()
		end,
	GetSize = function() return #view end,
	RowSetup = function(self, rowFrame, dataRowID)
			local id = view[dataRowID]
			local name, _
	
			if currentKey == KEY_COUNTERS then
				_, name = C_Garrison.GetFollowerAbilityCounterMechanicInfo(id)
			else
				name = C_Garrison.GetFollowerAbilityName(id)
			end
	
			if name then
				rowFrame.Name.Text:SetText(format("%s%s", colors.white, name))
				rowFrame.Name.Text:SetJustifyH("LEFT")
			end
		end,
	RowOnEnter = function()	end,
	RowOnLeave = function() end,
	ColumnSetup = function(self, button, dataRowID, character)
			local id = view[dataRowID]
			local icon, counterID, _ 

			if currentKey == KEY_COUNTERS then
				counterID, _, icon = C_Garrison.GetFollowerAbilityCounterMechanicInfo(id)
				id = counterID
			else
				icon = C_Garrison.GetFollowerAbilityIcon(id)
			end

			local numFollowers = DataStore:GetFollowerSpellCounters(character, currentKey, id) or 0

			button.Name:SetFontObject("NumberFontNormal")
			button.Name:SetJustifyH("CENTER")
			button.Name:SetPoint("BOTTOMRIGHT", 5, 0)
			button.Background:SetDesaturated(false)
			button.Background:SetTexCoord(0, 1, 0, 1)
			
			if numFollowers > 0 then
				-- button.key = character
				button.IconBorder:Hide()
				button.Background:SetTexture(icon)
				button.Background:SetVertexColor(0.5, 0.5, 0.5)
				button.Name:SetText(format("%s%d", colors.white, numFollowers))
				button:Show()
			else
				-- button.key = nil
				button:Hide()
			end
		end,
})
