local SLE, T, E, L, V, P, G = unpack(ElvUI_SLE)
local Sk = SLE.Skins
local S = E.Skins

-- GLOBALS: CreateFrame, MERCHANT_ITEMS_PER_PAGE, BUYBACK_ITEMS_PER_PAGE, hooksecurefunc, MERCHANT_PAGE_NUMBER, UIParent, ChatFontSmall
local _G = _G
local strtrim = strtrim
local ItemsPerSubpage, SubpagesPerPage
local math_max, math_ceil = math.max, math.ceil
local MerchantFrame_UpdateAltCurrency, MoneyFrame_Update = MerchantFrame_UpdateAltCurrency, MoneyFrame_Update
local GetMerchantNumItems = GetMerchantNumItems
local GetMerchantItemInfo, GetMerchantItemLink = GetMerchantItemInfo, GetMerchantItemLink
local SetItemButtonCount, SetItemButtonStock, SetItemButtonTexture = SetItemButtonCount, SetItemButtonStock, SetItemButtonTexture
local SetItemButtonNameFrameVertexColor, SetItemButtonSlotVertexColor, SetItemButtonTextureVertexColor, SetItemButtonNormalTextureVertexColor = SetItemButtonNameFrameVertexColor, SetItemButtonSlotVertexColor, SetItemButtonTextureVertexColor, SetItemButtonNormalTextureVertexColor
local C_CurrencyInfo_GetCurrencyInfo = C_CurrencyInfo.GetCurrencyInfo
local C_Item_GetItemInfo = C_Item.GetItemInfo

local RETRIEVING_ITEM_INFO, MOUNT, ITEM_SPELL_KNOWN, SEARCH = RETRIEVING_ITEM_INFO, MOUNT, ITEM_SPELL_KNOWN, SEARCH
local MISCELLANEOUS = MISCELLANEOUS
local MAX_MONEY_DISPLAY_WIDTH = 120

local RECIPE = C_Item.GetItemClassInfo(Enum.ItemClass.Recipe)
local searchBox
local searching = ''

local function SkinVendorItems(i)
	local item = _G['MerchantItem'..i]
	item:Size(155, 45)
	item:StripTextures(true)
	item:CreateBackdrop('Transparent')
	item.backdrop:Point('TOPLEFT', -3, 2)
	item.backdrop:Point('BOTTOMRIGHT', 2, -3)

	local slot = _G['MerchantItem'..i..'SlotTexture']
	item.Name:Point('LEFT', slot, 'RIGHT', -5, 5)
	item.Name:Size(110, 30)

	local button = _G['MerchantItem'..i..'ItemButton']
	button:StripTextures()
	button:StyleButton()
	button:SetTemplate(nil, true)
	button:Point('TOPLEFT', item, 'TOPLEFT', 4, -4)

	local icon = button.icon
	icon:SetTexCoord(unpack(E.TexCoords))
	icon:ClearAllPoints()
	icon:Point('TOPLEFT', 1, -1)
	icon:Point('BOTTOMRIGHT', -1, 1)

	S:HandleIconBorder(button.IconBorder)

	_G['MerchantItem'..i..'MoneyFrame']:ClearAllPoints()
	_G['MerchantItem'..i..'MoneyFrame']:Point('BOTTOMLEFT', button, 'BOTTOMRIGHT', 3, 0)
	MerchantBuyBackItemItemButton.IconBorder:SetAlpha(0)
end

local function UpdateButtonsPositions(isBuyBack)
	local btn
	local vertSpacing, horizSpacing

	if (isBuyBack) then
		vertSpacing = -30
		horizSpacing = 50
		searchBox:Hide()
	else
		vertSpacing = -16
		horizSpacing = 12
		searchBox:Show()
	end
	for i = 1, MERCHANT_ITEMS_PER_PAGE do
		btn = _G['MerchantItem' .. i]
		if (isBuyBack) then
			if (i > BUYBACK_ITEMS_PER_PAGE) then
				btn:Hide()
			else
				if (i == 1) then
					btn:SetPoint('TOPLEFT', _G.MerchantFrame, 'TOPLEFT', 64, -105)
				else
					if ((i % 3) == 1) then
						btn:SetPoint('TOPLEFT', _G['MerchantItem'..(i - 3)], 'BOTTOMLEFT', 0, vertSpacing)
					else
						btn:SetPoint('TOPLEFT', _G['MerchantItem'..(i - 1)], 'TOPRIGHT', horizSpacing, 0)
					end
				end
			end
		else
			btn:Show()
			if ((i % ItemsPerSubpage) == 1) then
				if (i == 1) then
					btn:SetPoint('TOPLEFT', _G.MerchantFrame, 'TOPLEFT', 24, -70)
				else
					btn:SetPoint('TOPLEFT', _G['MerchantItem'..(i - (ItemsPerSubpage - 1))], 'TOPRIGHT', 12, 0)
				end
			else
				if ((i % 2) == 1) then
					btn:SetPoint('TOPLEFT', _G['MerchantItem'..(i - 2)], 'BOTTOMLEFT', 0, vertSpacing)
				else
					btn:SetPoint('TOPLEFT', _G['MerchantItem'..(i - 1)], 'TOPRIGHT', horizSpacing, 0)
				end
			end
		end
	end
end

local function UpdateBuybackInfo()
	if E.private.sle.skins.merchant.style == 'Default' then UpdateButtonsPositions(true) end
	-- apply coloring
	local btn, link, quality, r, g, b, _
	for i = 1, BUYBACK_ITEMS_PER_PAGE, 1 do
		btn = _G['MerchantItem' .. i]
		if (btn) then
			link = GetBuybackItemLink(i)
			if (link) then
				_, _, quality = C_Item_GetItemInfo(link)
				if quality then
					r, g, b = GetItemQualityColor(quality)
				else
					r, g, b = 1, 1, 1
				end
				_G['MerchantItem' .. i .. 'Name']:SetTextColor(r, g, b)
			end
		end
	end
end

local function isKnown(link, itemType, itemSubType)
	if ( not link ) then
		return false
	end
	local upperLimit
	local isMount = false
	local isRecipe = false
	if itemType == RECIPE then
		isRecipe = true
	elseif itemType == MISCELLANEOUS and itemSubType == MOUNT then
		isMount = true
	end

	_G['SLE_Merchant_HiddenTooltip']:SetOwner(UIParent, 'ANCHOR_NONE')
	_G['SLE_Merchant_HiddenTooltip']:SetHyperlink(link)
	upperLimit = isRecipe and _G['SLE_Merchant_HiddenTooltip']:NumLines() or 0

	for i = 2, _G['SLE_Merchant_HiddenTooltip']:NumLines() do
		if (isRecipe and (i <= 5 or i >= upperLimit - 3)) or isMount or not isRecipe then
			local text = _G['SLE_Merchant_HiddenTooltipTextLeft'..i]
			local r, g, b = text:GetTextColor()
			local gettext = text:GetText()

			if ( gettext and r >= 0.9 and g <= 0.2 and b <= 0.2 and gettext ~= RETRIEVING_ITEM_INFO ) then
				if gettext == ITEM_SPELL_KNOWN then return true end
			end
		end
	end

	return false
end

local function UpdateMerchantInfo()
	UpdateButtonsPositions()

	local totalMerchantItems = GetMerchantNumItems()
	local visibleMerchantItems = 0
	local indexes = {}
	local _, name, texture, price, quantity, numAvailable, isUsable, extendedCost, r, g, b, notOptimal
	local link, quality, itemLevel, itemMinLevel, itemType, itemSubType, itemStackCount, itemEquipLoc, itemSellPrice, itemId

	for i = 1, totalMerchantItems do
		tinsert(indexes, i)
		visibleMerchantItems = visibleMerchantItems + 1
	end

	 -- validate current page shown
	if (_G['MerchantFrame'].page > math_max(1, math_ceil(visibleMerchantItems / MERCHANT_ITEMS_PER_PAGE))) then
		_G['MerchantFrame'].page = math_max(1, math_ceil(visibleMerchantItems / MERCHANT_ITEMS_PER_PAGE))
	end

	-- Show correct page count based on number of items shown
	_G['MerchantPageText']:SetFormattedText(MERCHANT_PAGE_NUMBER, _G['MerchantFrame'].page, math_ceil(visibleMerchantItems / MERCHANT_ITEMS_PER_PAGE))

	--Display shit
	for i = 1, MERCHANT_ITEMS_PER_PAGE do
		 local index = ((_G['MerchantFrame'].page - 1) * MERCHANT_ITEMS_PER_PAGE) + i
		local itemButton = _G['MerchantItem'..i..'ItemButton']
		itemButton.link = nil
		local merchantButton = _G['MerchantItem'..i]
		local merchantMoney = _G['MerchantItem'..i..'MoneyFrame']
		local merchantAltCurrency = _G['MerchantItem'..i..'AltCurrencyFrame']
		if (index <= visibleMerchantItems) then
			name, texture, price, quantity, numAvailable, isPurchasable, isUsable, extendedCost = GetMerchantItemInfo(indexes[index])
			if (name ~= nil) then
				local canAfford = CanAffordMerchantItem(index)
				_G['MerchantItem'..i..'Name']:SetText(name)
				SetItemButtonCount(itemButton, quantity)
				SetItemButtonStock(itemButton, numAvailable)
				SetItemButtonTexture(itemButton, texture)

				if (extendedCost and (price <= 0)) then -- update item's currency info
					itemButton.price = nil
					itemButton.extendedCost = true
					itemButton.name = name
					itemButton.link = GetMerchantItemLink(indexes[index])
					itemButton.texture = texture
					MerchantFrame_UpdateAltCurrency(index, i, canAfford)
					merchantAltCurrency:ClearAllPoints()
					merchantAltCurrency:SetPoint('BOTTOMLEFT', 'MerchantItem'..i..'NameFrame', 'BOTTOMLEFT', 0, 31)
					merchantMoney:Hide()
					merchantAltCurrency:Show()
				elseif ( extendedCost and (price > 0) ) then
					itemButton.price = price
					itemButton.extendedCost = true
					itemButton.name = name
					itemButton.link = GetMerchantItemLink(indexes[index])
					itemButton.texture = texture
					local altCurrencyWidth = MerchantFrame_UpdateAltCurrency(index, i, canAfford)
					MoneyFrame_SetMaxDisplayWidth(merchantMoney, MAX_MONEY_DISPLAY_WIDTH - altCurrencyWidth)
					MoneyFrame_Update(merchantMoney:GetName(), price)
					local color
					if (canAfford == false) then
						color = 'red'
					end
					SetMoneyFrameColor(merchantMoney:GetName(), color)
					merchantAltCurrency:ClearAllPoints()
					merchantAltCurrency:SetPoint('LEFT', merchantMoney:GetName(), 'RIGHT', -14, 0)
					merchantAltCurrency:Show()
					merchantMoney:Show()
				else
					itemButton.price = price
					itemButton.extendedCost = nil
					itemButton.name = name
					itemButton.link = GetMerchantItemLink(indexes[index])
					itemButton.texture = texture
					MoneyFrame_SetMaxDisplayWidth(merchantMoney, MAX_MONEY_DISPLAY_WIDTH)
					MoneyFrame_Update(merchantMoney:GetName(), price)
					local color
					if (canAfford == false) then
						color = 'red'
					end
					SetMoneyFrameColor(merchantMoney:GetName(), color)
					merchantAltCurrency:Hide()
					merchantMoney:Show()
				end

				MerchantFrameItem_UpdateQuality(merchantButton, itemButton.link)

				local merchantItemID = GetMerchantItemID(index)
				local isHeirloom = merchantItemID and C_Heirloom.IsItemHeirloom(merchantItemID)
				local isKnownHeirloom = isHeirloom and C_Heirloom.PlayerHasHeirloom(merchantItemID)

				itemButton.showNonrefundablePrompt = isHeirloom

				itemButton.hasItem = true
				itemButton:SetID(indexes[index])
				itemButton:Show()

				local tintRed = not isPurchasable or (not isUsable and not isHeirloom)

				local colorMult = 1.0
				local detailColor = {}
				local slotColor = {}
				-- unavailable items (limited stock, bought out) are darkened
				if ( numAvailable == 0 or isKnownHeirloom) then
					colorMult = 0.5
				end
				if ( tintRed ) then
					slotColor = {r = 1.0, g = 0, b = 0}
					detailColor = {r = 1.0, g = 0, b = 0}
				else
					if not isKnown(itemButton.link, itemType, itemSubType) then
						slotColor = {r = 1.0, g = 1.0, b = 1.0}
						detailColor = {r = 0.5, g = 0.5, b = 0.5}
					else
						slotColor = {r = 1.0, g = 0, b = 0}
						detailColor = {r = 1.0, g = 0, b = 0}
					end
				end
				local alpha = 0.3
				if ( searching == "" or searching == SEARCH:lower() or name:lower():match(searching)
					or ( quality and ( tostring(quality):lower():match(searching) or _G["ITEM_QUALITY"..tostring(quality).."_DESC"]:lower():match(searching) ) )
					or ( itemType and itemType:lower():match(searching) )
					or ( itemSubType and itemSubType:lower():match(searching) )
					) then
					alpha = 1
				end
				merchantButton:SetAlpha(alpha)
				SetItemButtonNameFrameVertexColor(merchantButton, detailColor.r * colorMult, detailColor.g * colorMult, detailColor.b * colorMult)
				SetItemButtonSlotVertexColor(merchantButton, slotColor.r * colorMult, slotColor.g * colorMult, slotColor.b * colorMult)
				SetItemButtonTextureVertexColor(itemButton, slotColor.r * colorMult, slotColor.g * colorMult, slotColor.b * colorMult)
				SetItemButtonNormalTextureVertexColor(itemButton, slotColor.r * colorMult, slotColor.g * colorMult, slotColor.b * colorMult)
			end
		else
			itemButton.price = nil
			itemButton.hasItem = nil
			itemButton.name = nil
			itemButton:Hide()
			SetItemButtonNameFrameVertexColor(merchantButton, 0.5, 0.5, 0.5)
			SetItemButtonSlotVertexColor(merchantButton,0.4, 0.4, 0.4)
			_G['MerchantItem'..i..'Name']:SetText('')
			_G['MerchantItem'..i..'MoneyFrame']:Hide()
			_G['MerchantItem'..i..'AltCurrencyFrame']:Hide()
		end
	end
end

local function RebuildMerchantFrame()
	ItemsPerSubpage = MERCHANT_ITEMS_PER_PAGE
	SubpagesPerPage = E.private.sle.skins.merchant.subpages
	MERCHANT_ITEMS_PER_PAGE = SubpagesPerPage * 10 --Haven't seen this causing any taints so I asume it's ok
	_G.MerchantFrame:SetWidth(42 + (318 * SubpagesPerPage) + (12 * (SubpagesPerPage - 1)))

	for i = 1, MERCHANT_ITEMS_PER_PAGE do
		if not _G['MerchantItem'.. i] then
			CreateFrame('Frame', 'MerchantItem'..i, _G.MerchantFrame, 'MerchantItemTemplate')
			SkinVendorItems(i)
		end
	end
	 -- alter the position of the buyback item slot on the merchant tab
	_G.MerchantBuyBackItem:ClearAllPoints()
	_G.MerchantBuyBackItem:SetPoint('TOPLEFT', _G.MerchantItem10, 'BOTTOMLEFT', -14, -20)

	-- move the next/previous page buttons
	_G.MerchantPrevPageButton:ClearAllPoints()
	_G.MerchantPrevPageButton:SetPoint('CENTER', _G.MerchantFrame, 'BOTTOM', 50, 70)
	_G.MerchantPageText:ClearAllPoints()
	_G.MerchantPageText:SetPoint('BOTTOM', _G.MerchantFrame, 'BOTTOM', 160, 65)
	_G.MerchantNextPageButton:ClearAllPoints()
	_G.MerchantNextPageButton:SetPoint('CENTER', _G.MerchantFrame, 'BOTTOM', 270, 70)

	-- currency insets
	_G.MerchantExtraCurrencyInset:ClearAllPoints()
	_G.MerchantExtraCurrencyInset:SetPoint('BOTTOMRIGHT', _G.MerchantMoneyInset, 'BOTTOMLEFT', 0, 0)
	_G.MerchantExtraCurrencyInset:SetPoint('TOPLEFT', _G.MerchantMoneyInset, 'TOPLEFT', -165, 0)
	_G.MerchantExtraCurrencyBg:ClearAllPoints()
	_G.MerchantExtraCurrencyBg:SetPoint('TOPLEFT', _G.MerchantExtraCurrencyInset, 'TOPLEFT', 3, -2)
	_G.MerchantExtraCurrencyBg:SetPoint('BOTTOMRIGHT', _G.MerchantExtraCurrencyInset, 'BOTTOMRIGHT', -3, 2)

	searchBox = CreateFrame('EditBox', '$parentSearchBox', _G.MerchantFrame, 'InputBoxTemplate')
	searchBox:SetWidth(_G.MerchantItem1:GetWidth())
	searchBox:SetHeight(24)
	searchBox:SetPoint('BOTTOMLEFT', _G.MerchantItem1, 'TOPLEFT', 0, 9)
	searchBox:SetAutoFocus(false)
	searchBox:SetFontObject(ChatFontSmall)
	searchBox:SetScript('OnTextChanged', function(self) searching = self:GetText():trim():lower(); UpdateMerchantInfo() end)
	searchBox:SetScript('OnShow', function(self) self:SetText(SEARCH); searching = '' end)
	searchBox:SetScript('OnEnterPressed', function(self)  self:ClearFocus() end)
	searchBox:SetScript('OnEscapePressed', function(self)  self:ClearFocus(); self:SetText(SEARCH); searching = '' end)
	searchBox:SetScript('OnEditFocusLost', function(self)
		self:HighlightText(0, 0)
		if ( strtrim(self:GetText()) == '' ) then
			self:SetText(SEARCH)
			searching = ''
		end
	end)
	searchBox:SetScript('OnEditFocusGained', function(self)
		self:HighlightText()
		if ( self:GetText():trim():lower() == SEARCH:lower() ) then
			self:SetText('')
		end
	end)
	searchBox:SetText(SEARCH)
	S:HandleEditBox(searchBox)
end

local function MerchantSkinInit()
	if E.private.skins.blizzard.enable ~= true or E.private.skins.blizzard.merchant ~= true or E.private.sle.skins.merchant.enable ~= true then return end
	hooksecurefunc('MerchantFrame_UpdateBuybackInfo', UpdateBuybackInfo)
	if E.private.sle.skins.merchant.style ~= 'Default' then return end
	RebuildMerchantFrame()
	UpdateButtonsPositions()
	CreateFrame('GameTooltip', 'SLE_Merchant_HiddenTooltip', UIParent, 'GameTooltipTemplate')

	hooksecurefunc('MerchantFrame_UpdateMerchantInfo', UpdateMerchantInfo)
end

hooksecurefunc(S, 'Initialize', MerchantSkinInit)