local cache = smart_inventory.cache
local doc_addon = smart_inventory.doc_addon
local ui_tools = smart_inventory.ui_tools

-----------------------------------------------------
-- Update recipe preview item informations about the selected item
-----------------------------------------------------
local function update_crafting_preview(state)
	local player = state.location.rootState.location.player
	local listentry = state.param.crafting_recipes_preivew_listentry
	local selected = state.param.crafting_recipes_preivew_selected
	local itemdef = listentry.itemdef
	local inf_state = state:get("inf_area"):getContainerState()
	local cr_type_img = state:get("cr_type_img")
	local craft_result = inf_state:get("craft_result")
	local group_list = inf_state:get("item_groups")

	-- get recipe to display, check paging buttons needed
	local recipe
	if listentry.recipes then
		if not listentry.recipes[selected] then
			selected = 1
		end
		state.param.crafting_recipes_preivew_selected = selected
		if listentry.recipes[selected-1] then
			state:get("preview_prev"):setVisible(true)
		else
			state:get("preview_prev"):setVisible(false)
		end
		if listentry.recipes[selected+1] then
			state:get("preview_next"):setVisible(true)
		else
			state:get("preview_next"):setVisible(false)
		end

		if listentry.recipes[selected] then
			recipe = listentry.recipes[selected]
			local crecipe = cache.crecipes[recipe]
			if crecipe then
				recipe = crecipe:get_with_placeholder(player, state.param.crafting_items_in_inventory)
			end
		end
	else
		state:get("preview_prev"):setVisible(false)
		state:get("preview_next"):setVisible(false)
	end

	-- display the recipe result or selected item
	if recipe then
		if recipe.type == "normal" then
			state:get("cr_type"):setText("")
			cr_type_img:setVisible(false)
		elseif recipe.type == "cooking" then
			state:get("cr_type"):setText(recipe.type)
			state:get("cr_type"):setText("")
			cr_type_img:setVisible(true)
			cr_type_img:setImage("default_furnace_front.png")
		else
			state:get("cr_type"):setText(recipe.type)
			cr_type_img:setVisible(false)
		end
		craft_result:setImage(recipe.output)
		craft_result:setVisible()
		state:get("craft_preview"):setCraft(recipe)
	else
		state:get("cr_type"):setText("")
		state:get("craft_preview"):setCraft(nil)
		cr_type_img:setVisible(false)
		if itemdef then
			craft_result:setVisible(true)
			craft_result:setImage(itemdef.name)
		else
			craft_result:setVisible(false)
		end
	end

	-- display docs icon if revealed item
	if smart_inventory.doc_items_mod then
		inf_state:get("doc_btn"):setVisible(false)
		local outitem = craft_result:getImage()
		if outitem then
			outitem:gsub("[^%s]+", function(z)
				if doc_addon.is_revealed_item(z, player) then
					inf_state:get("doc_btn"):setVisible(true)
				end
			end)
		end
	end

	-- update info area
	if itemdef then
		inf_state:get("info1"):setText(itemdef.description)
		inf_state:get("info2"):setText("("..itemdef.name..")")
		if itemdef._doc_items_longdesc then
			inf_state:get("info3"):setText(itemdef._doc_items_longdesc)
		else
			inf_state:get("info3"):setText("")
		end

		group_list:clearItems()
		if cache.citems[itemdef.name] then
			for _, groupdef in ipairs(ui_tools.get_tight_groups(cache.citems[itemdef.name].cgroups)) do
				group_list:addItem(groupdef.group_desc)
			end
		end
	else
		inf_state:get("info1"):setText("")
		inf_state:get("info2"):setText("")
		inf_state:get("info3"):setText("")
		group_list:clearItems()
	end
end

-----------------------------------------------------
-- Update the group selection table
-----------------------------------------------------
local function update_group_selection(state, rebuild)
	local grouped = state.param.crafting_grouped_items
	local groups_sel = state:get("groups_sel")
	local grid = state:get("buttons_grid")
	local label = state:get("inf_area"):getContainerState():get("groups_label")

	if rebuild then
		state.param.crafting_group_list = ui_tools.update_group_selection(grouped, groups_sel, state.param.crafting_group_list)
	end

	local sel_id = groups_sel:getSelected()
	if state.param.crafting_group_list[sel_id] then
		state.param.crafting_craftable_list = grouped[state.param.crafting_group_list[sel_id]].items
		table.sort(state.param.crafting_craftable_list, function(a,b)
			return a.item < b.item
		end)
		grid:setList(state.param.crafting_craftable_list)
		label:setText(groups_sel:getSelectedItem())
	else
		label:setText("Empty List")
		grid:setList({})
	end
end

-----------------------------------------------------
-- Update the items list
-----------------------------------------------------
local function update_from_recipelist(state, recipelist)
	local duplicate_index_tmp = {}
	local craftable_itemlist = {}

	for recipe, _ in pairs(recipelist) do
		local def = cache.crecipes[recipe].out_item
		if duplicate_index_tmp[def.name] then
			table.insert(duplicate_index_tmp[def.name].recipes, recipe)
		else
			local entry = {
				itemdef = def,
				recipes = {},
				-- buttons_grid related
				item = def.name,
				is_button = true
			}
			duplicate_index_tmp[def.name] = entry
			table.insert(entry.recipes, recipe)
			table.insert(craftable_itemlist, entry)
		end
	end
	state.param.crafting_grouped_items = cache.get_list_grouped(craftable_itemlist)
	update_group_selection(state, true)
end

-----------------------------------------------------
-- Lookup inventory
-----------------------------------------------------
local function create_lookup_inv(state, name)
	local player = minetest.get_player_by_name(name)
	local invname = name.."_crafting_inv"
	local plistname = "crafting_inv_lookup"
	local listname = "lookup"
	local pinv = player:get_inventory()
	local inv = minetest.get_inventory({type="detached", name=invname})
	if not inv then
		inv = minetest.create_detached_inventory(invname, {
			allow_move = function(inv, from_list, from_index, to_list, to_index, count, player)
				return 0
			end,
			allow_put = function(inv, listname, index, stack, player)
				if pinv:is_empty(plistname) then
					return 99
				else
					return 0
				end
			end,
			allow_take = function(inv, listname, index, stack, player)
				return 99
			end,
			on_move = function(inv, from_list, from_index, to_list, to_index, count, player)
			end,
			on_put = function(inv, listname, index, stack, player)
				pinv:set_stack(plistname, index, stack)
				local lookup_item = stack:get_name()
				state.param.crafting_items_in_inventory = state.param.invobj:get_items()
				state.param.crafting_items_in_inventory[lookup_item] = true -- prefer in recipe preview
				local state = smart_inventory.get_page_state("crafting", player:get_player_name())
				-- get all craftable recipes with lookup-item as ingredient. Add recipes of lookup item to the list
				local recipes = cache.crecipes.get_revealed_recipes_with_items(name, {[lookup_item] = true })
				local valid_lookup_recipes = {}
				if cache.citems[lookup_item] and cache.citems[lookup_item].in_output_recipe then
					for _, recipe in ipairs(cache.citems[lookup_item].in_output_recipe) do
						if cache.crecipes[recipe]:is_revealed(player:get_player_name()) then
							recipes[recipe] = true
							table.insert(valid_lookup_recipes, recipe)
						end
					end
				end
				update_from_recipelist(state, recipes)

				-- show lookup item in preview
				state.param.crafting_recipes_preivew_selected = 1
				state.param.crafting_recipes_preivew_listentry = {
					itemdef = minetest.registered_items[lookup_item],
					item = lookup_item
				}
				if cache.citems[lookup_item] then
					state.param.crafting_recipes_preivew_listentry.recipes = valid_lookup_recipes
				end
				update_crafting_preview(state)
				if state:get("info_tog"):getId() == 1 then
					state:get("info_tog"):submit()
				end
				-- reset group selection and search field on proposal mode change
				if state.param.survival_proposal_mode ~= "lookup" then
					state.param.survival_proposal_mode = "lookup"
					state:get("groups_sel"):setSelected(1)
					state:get("search"):setText("")
				end
				-- we are outsite of usual smartfs processing. So trigger the formspec update byself
				smartfs.inv[name]:show()

				-- put back
				minetest.after(1, function(stack)
					local applied = pinv:add_item("main", stack)
					pinv:set_stack(plistname, 1, applied)
					inv:set_stack(listname, 1, applied)
				end, stack)
			end,
			on_take = function(inv, listname, index, stack, player)
				pinv:set_stack(plistname, index, nil)
			end,
		}, name)
	end
	-- copy the item from player:listname inventory to the detached
	inv:set_size(listname, 1)
	pinv:set_size(plistname, 1)
	local stack = pinv:get_stack(plistname, 1)
	inv:set_stack(listname, 1, stack)
end

-----------------------------------------------------
-- Page layout definition
-----------------------------------------------------
local function crafting_callback(state)
	local player = state.location.rootState.location.player

	-- set inventory style
	state:element("code", {name = "inventory_bg_code", code = "listcolors[#00000069;#5A5A5A;#141318;#30434C;#FFF]"})

	--Inventorys / left site
	state:inventory(1, 5, 8, 4,"main")
	state:inventory(1.2, 0.2, 3, 3,"craft")
	state:inventory(4.2, 2.2, 1, 1,"craftpreview")
	state:background(1, 0, 4.5, 3.5, "img1", "menu_bg.png")

	ui_tools.create_trash_inv(state, player)
	state:image(8,9,1,1,"trash_icon","creative_trash_icon.png")
	state:inventory(8, 9, 1, 1, "trash"):useDetached(player.."_trash_inv")

	state:button(1, 4.2, 2, 0.5, "compress", "Compress"):onClick(function(self, state, player)
		state.param.invobj:compress()
	end)

	state:button(3, 4.2, 2, 0.5, "clear", "Sweep"):onClick(function(self, state, player)
		state.param.invobj:sweep_crafting_inventory()
	end)

	-- recipe preview area
	smart_inventory.smartfs_elements.craft_preview(state, 6, 0, "craft_preview")
	state:image(7,2.8,1,1,"cr_type_img",""):setVisible(false)
	state:label(7,3,"cr_type", "")
	local pr_prev_btn = state:button(6, 3, 1, 0.5, "preview_prev", "<<")
	pr_prev_btn:onClick(function(self, state, player)
		state.param.crafting_recipes_preivew_selected = state.param.crafting_recipes_preivew_selected -1
		update_crafting_preview(state)
	end)
	pr_prev_btn:setVisible(false)
	local pr_next_btn = state:button(8, 3, 1, 0.5, "preview_next", ">>")
	pr_next_btn:onClick(function(self, state, player)
		state.param.crafting_recipes_preivew_selected = state.param.crafting_recipes_preivew_selected +1
		update_crafting_preview(state)
	end)
	pr_next_btn:setVisible(false)

	-- (dynamic-1) group selection
	local group_sel = state:listbox(10.2, 0.15, 7.6, 3.6, "groups_sel",nil, true)
	group_sel:onClick(function(self, state, player)
		local selected = self:getSelectedItem()
		if selected then
			update_group_selection(state, false)
		end
	end)

	-- (dynamic-2) item preview area
	state:background(10.0, 0.1, 8, 3.8, "craft_img2", "minimap_overlay_square.png")
	local inf_area = state:view(6.4, 0.1, "inf_area")
	local inf_state = inf_area:getContainerState()
	inf_state:label(11.5,0.5,"info1", "")
	inf_state:label(11.5,1.0,"info2", "")
	inf_state:label(11.5,1.5,"info3", "")
	inf_state:item_image(10.2,0.3, 1, 1, "craft_result",nil):setVisible(false)
	if smart_inventory.doc_items_mod then
		local doc_btn = inf_state:item_image_button(10.2,2.3, 1, 1, "doc_btn","", "doc_identifier:identifier_solid")
		doc_btn:setVisible(false)
		doc_btn:onClick(function(self, state, player)
			local outitem = state:get("craft_result"):getImage()
			if outitem then
				outitem:gsub("[^%s]+", function(z)
					if minetest.registered_items[z] then
						doc_addon.show(z, player)
					end
				end)
			end
		end)
	end
	inf_state:label(10.3, 3.25, "groups_label", "All")

	inf_state:listbox(12, 2, 5.7, 1.3, "item_groups",nil, true)
	inf_area:setVisible(false)

	-- Lookup
	create_lookup_inv(state, player)
	state:image(10, 4, 1, 1,"lookup_icon", "default_bookshelf_slot.png")
	state:inventory(10, 4.0, 1, 1,"lookup"):useDetached(player.."_crafting_inv")

	-- Get craftable by items in inventory
	local craftable_button = state:button(11, 4.2, 2, 0.5, "craftable", "Craftable")
	craftable_button:onClick(function(self, state, player)
		-- reset group selection and search field on proposal mode change
		if state.param.survival_proposal_mode ~= "craftable" then
			state.param.survival_proposal_mode = "craftable"
			state:get("groups_sel"):setSelected(1)
			state:get("search"):setText("")
		end
		state.param.crafting_items_in_inventory = state.param.invobj:get_items()
		local craftable = cache.crecipes.get_recipes_craftable(player, state.param.crafting_items_in_inventory)
		update_from_recipelist(state, craftable)
		if state:get("info_tog"):getId() == 2 then
			state:get("info_tog"):submit()
		end
	end)

	-- search
	local searchfield = state:field(13.3, 4.5, 3, 0.5, "search")
	searchfield:setCloseOnEnter(false)
	searchfield:onKeyEnter(function(self, state, player)
		local filtered_list = ui_tools.search_in_list(cache.get_revealed_items(player), self:getText(), player)
		state.param.crafting_grouped_items = cache.get_list_grouped(filtered_list)
		-- reset group selection if proposal mode is changed
		if state.param.survival_proposal_mode ~= "search" then
			state.param.survival_proposal_mode = "search"
			state:get("groups_sel"):setSelected(1)
		end
		update_group_selection(state, true)
	end)

	-- groups toggle
	local info_tog = state:toggle(16,4.2,2,0.5, "info_tog", {"Info", "Groups"})
	info_tog:onToggle(function(self, state, player)
		if self:getId() == 2 then
			state:get("inf_area"):setVisible(true)
			state:get("groups_sel"):setVisible(false)
		else
			state:get("inf_area"):setVisible(false)
			state:get("groups_sel"):setVisible(true)
		end
	end)

	-- craftable items grid
	state:background(10, 5, 8, 4, "buttons_grid_Bg", "minimap_overlay_square.png")
	local grid = smart_inventory.smartfs_elements.buttons_grid(state, 10.25, 5.15, 8 , 4, "buttons_grid", 0.75,0.75)
	grid:onClick(function(self, state, index, player)
		local listentry = state.param.crafting_craftable_list[index]
		state.param.crafting_recipes_preivew_selected = 1
		state.param.crafting_recipes_preivew_listentry = listentry
		update_crafting_preview(state)
		if state:get("info_tog"):getId() == 1 then
			state:get("info_tog"):submit()
		end
	end)

	-- initial values
	craftable_button:submit("not used fieldname", state.location.rootState.location.player)
end

-----------------------------------------------------
-- Register page in smart_inventory
-----------------------------------------------------
smart_inventory.register_page({
	name = "crafting",
	tooltip = "Craft new items",
	icon = "inventory_btn.png",
	smartfs_callback = crafting_callback,
	sequence = 10
})