local addonName, A = ...

-- GLOBALS: SPELL_FAILED_ERROR, OpenStackSplitFrame, StackSplitFrame_OnChar, StackSplitFrame

-- Lua functions
local tostring = tostring
local min = math.min
local max = math.max
local floor = math.floor

-- Wow functions
local IsTradeSkillGuild = IsTradeSkillGuild
local IsTradeSkillLinked = IsTradeSkillLinked
local IsModifierKeyDown = IsModifierKeyDown
local IsShiftKeyDown = IsShiftKeyDown
local GetTradeSkillSelectionIndex = GetTradeSkillSelectionIndex
local GetTradeSkillReagentItemLink = GetTradeSkillReagentItemLink
local GetTradeSkillReagentInfo = GetTradeSkillReagentInfo
local GetTradeSkillLine = GetTradeSkillLine
local GetItemInfo = GetItemInfo
local DoTradeSkill = DoTradeSkill

--SPELL_FAILED_REAGENTS = "Missing reagent: %s";
--ERR_SPELL_FAILED_REAGENTS_GENERIC = "Missing reagent";
--ERR_INTERNAL_BAG_ERROR = "Internal Bag Error";
--SPELL_FAILED_ERROR = "Internal error";

---------------------------------------------------
-- Craft items
---------------------------------------------------
-- Function run after selecting a item in the tradeskill window
-- It only "prefilters" the possibilities
function A.ProcessReagent(btn)
	-- Do not manage guild or linked tradeskill
	if IsTradeSkillGuild() or IsTradeSkillLinked() then return end

	-- We want no modifiers, or shift to choose the number of reagent to craft
	if IsModifierKeyDown() and not IsShiftKeyDown() then return end
	local chooseNumberToCraft = IsShiftKeyDown()

	-- Index of the reagent in the recipe, taken from the button name
	local reagentIndexInRecipe = A.buttonNumber(btn)

	-- ID of the reagent we want to craft
	local recipeIndex = GetTradeSkillSelectionIndex()
	local reagentID = A.link2ID(GetTradeSkillReagentItemLink(recipeIndex, reagentIndexInRecipe))

	-- Continue only if the reagent is known
	if not reagentID or not A.data[reagentID] then return end

	-- If only one recipe is known for the reagent and it is an actual recipe, use it
	if #(A.data[reagentID]) == 1 and not A.data[reagentID][1].macro then
		A.CraftItemWithRecipe(recipeIndex,reagentID,A.data[reagentID][1],reagentIndexInRecipe,chooseNumberToCraft,btn)

	else -- Many recipes are known for this item, or it is not a standard tradeskill display them all
		A.externalCraftWindow(reagentID,reagentIndexInRecipe)
	end -- if
end -- function

-- Launch the procedure for a standard recipe
-- Can be called from the external window
function A.CraftItemWithRecipe(recipeIndex,reagentID,recipeData,reagentIndexInRecipe,chooseNumberToCraft,btn)
	-- Check that it's the same tradeskill
	if recipeData.tradeskillName ~= GetTradeSkillLine() then
		A.Error(A.L["The recipe to make this reagent is in another tradeskill. Currently ReagentMaker can not manage such a case, sorry."])
		return
	end

	-- Check how many times the recipe is makable
	local numMakable = A.numRecipeMakable(recipeData[1],recipeData[2])
	if not numMakable then
		A.Error(SPELL_FAILED_ERROR)
		return
	end

	if numMakable<=0 then
		-- If not makable, try a one-step recursion
		-- enables e.g. to mill to create an ink
		-- need a unique reagent
		if recipeData[1] and A.data[recipeData[1]] then
			if A.externalCraftWindow(recipeData[1],reagentIndexInRecipe,reagentID) ~= false then
				-- there was no problem opening the external window
				return
			end
		end

		-- There isn't enough reagents
		--@todo include name of reagent if unique
		A.Error(A.L["You do not have enough reagents to craft [%s]"]:format(GetItemInfo(reagentID) or "item #"..reagentID))
		return
	end

	-- Optimal number of items to craft
	local numToMake = A.numToMake(recipeIndex, reagentIndexInRecipe,numMakable, recipeData[3], recipeData[4])

	-- Choose number or craft directly
	if chooseNumberToCraft then
		-- Store info to be able to run the function later
		btn.ReagentMaker_reagentID = reagentID
		btn.ReagentMaker_recipeData = recipeData

		-- Open dialog
		OpenStackSplitFrame(numMakable, btn, "TOP", "BOTTOM")

		-- Fill in the number to make
		numToMake = tostring(numToMake)
		for i = 1,numToMake:len() do
			StackSplitFrame_OnChar(StackSplitFrame,numToMake:gsub(i,i))
		end
		StackSplitFrame.typing = 0 -- reinit the frame so that the entered value will be erased on text entry
	else
		A.DoCraft(reagentID,recipeData,numToMake)
	end -- if
end

-- Compute optimal number of items to craft
function A.numToMake(recipeIndex, reagentIndexInRecipe,numReagentMakable,minMade,maxMade)
	-- Look at how many we need to make one item for the selected recipe
	local numToMake = 1
	local _, _, reagentCount, playerReagentCount = GetTradeSkillReagentInfo(recipeIndex, reagentIndexInRecipe)
	-- make enough reagents to craft one more item
	numToMake = min(floor(playerReagentCount/reagentCount+1)*reagentCount-playerReagentCount,numReagentMakable)

	-- take into account that some recipe craft more than one item
	-- use the mean between min and max, but make at least one...
	if not minMade then
		minMade = 1
	elseif minMade<1 then
		-- from the percentage, compute the mean number of crafts to make
		minMade = 1/minMade
	end
	if not maxMade then
		maxMade = minMade
	end
	numToMake = max(floor(2*numToMake/(maxMade+minMade)),1)
	return numToMake
end

-- function used after choosing the number of reagent to craft
function A.SplitStack(owner,split)
	A.DoCraft(owner.ReagentMaker_reagentID,owner.ReagentMaker_recipeData,split)
	owner.ReagentMaker_reagentID = nil
	owner.ReagentMaker_recipeData = nil
end

-- Find the recipe and do the crafting
function A.DoCraft(reagentID,recipeData,numToMake)
	-- Remove filters
	A.SaveActiveFilters(recipeData.header)

	-- Find recipe index
	local reagentIndex = A.findExactSkillIndex(reagentID,recipeData.spellLink)

	-- Error if not found
	if not reagentIndex then
		A.Error(A.L["The recipe to make the reagent seems to be hidden, it is not makable. Try to remove the filters on the recipes."])
		A.RestoreActiveFilters()
		return
	end

	-- Craft the item, finally !
	DoTradeSkill(reagentIndex,numToMake)

	-- Restore Filters
	A.RestoreActiveFilters()
end