bitchange/shop.lua

--Created by Krock for the BitChange mod
--Parts of codes, images and ideas from Dan Duncombe's exchange shop
--  https://forum.minetest.net/viewtopic.php?id=7002
--License: WTFPL

local exchange_shop = {}

local function get_exchange_shop_formspec(number,pos,title)
	local formspec = ""
	local name = "nodemeta:"..pos.x..","..pos.y..","..pos.z
	if(number == 1) then
		-- customer
		formspec = ("size[8,9;]"..
				"label[0,0;Exchange shop]"..
				"label[1,0.5;Owner needs:]"..
				"list["..name..";cust_ow;1,1;2,2;]"..
				"button[3,2.5;2,1;exchange;Exchange]"..
				"label[5,0.5;Owner gives:]"..
				"list["..name..";cust_og;5,1;2,2;]"..
				"label[1,3.5;Ejected items:]"..
				"list["..name..";cust_ej;3,3.5;4,1;]"..
				"list[current_player;main;0,5;8,4;]")
	elseif(number == 2 or number == 3) then
		-- owner
		formspec = ("size[11,10;]"..
				"label[0,0;Exchange shop]"..
				"field[2.5,0.5;3,0.2;title;;"..title.."]"..
				"label[0,0.7;You need:]"..
				"list["..name..";cust_ow;0,1.2;2,2;]"..
				"label[3,0.7;You give:]"..
				"list["..name..";cust_og;3,1.2;2,2;]"..
				"label[1,3.5;Ejected items:]"..
				"list["..name..";custm_ej;0,4;4,1;]"..
				"label[6,0;You are viewing:]")
		if(number == 2) then
			formspec = (formspec.."button[8.5,0;2.5,1;vstock;Customers stock]"..
				"list["..name..";custm;6,1;5,4;]")
		else
			formspec = (formspec.."button[8.5,0;2.5,1;vcustm;Your stock]"..
				"list["..name..";stock;6,1;5,4;]")
		end
		formspec = (formspec..
				"label[1,5;Use (E) + (Right click) for customer interface]"..
				"list[current_player;main;1,6;8,4;]")
	end
	return formspec
end

local function get_exchange_shop_tube_config(mode)
	if(bitchange_exchangeshop_pipeworks) then
		if(mode == 1) then
			return {choppy=2, oddly_breakable_by_hand=2, tubedevice=1, tubedevice_receiver=1}
		else
			return {
				insert_object = function(pos, node, stack, direction)
					local meta = minetest.get_meta(pos)
					local inv = meta:get_inventory()
					return inv:add_item("stock",stack)
				end,
				can_insert = function(pos, node, stack, direction)
					local meta = minetest.get_meta(pos)
					local inv = meta:get_inventory()
					return inv:room_for_item("stock",stack)
				end,
				input_inventory="custm",
				connect_sides = {left=1, right=1, back=1, top=1, bottom=1}
			}
		end
	else
		if(mode == 1) then
			return {choppy=2,oddly_breakable_by_hand=2}
		else
			return {
				insert_object = function(pos, node, stack, direction)
					return false
				end,
				can_insert = function(pos, node, stack, direction)
					return false
				end,
				connect_sides = {}
			}
		end
	end
end

minetest.register_on_player_receive_fields(function(sender, formname, fields)
	if (formname == "bitchange:shop_formspec") then
		local player_name = sender:get_player_name()
		local pos = exchange_shop[player_name]
		local meta = minetest.get_meta(pos)
		local title = meta:get_string("title") or ""
		local shop_owner = meta:get_string("owner")
		
		if(fields.exchange) then
			local player_inv = sender:get_inventory()
			local shop_inv = meta:get_inventory()
			local err_msg = ""
			local cust_ow = shop_inv:get_list("cust_ow")
			local cust_og = shop_inv:get_list("cust_og")
			local cust_ow_legal = true
			local cust_og_legal = true
			--?shop configured well
			for i1, item1 in pairs(cust_ow) do
				for i2, item2 in pairs(cust_ow) do
					if (item1:get_name() == item2:get_name() and i1 ~= i2 and item1:get_name() ~= "") then
						cust_ow_legal = false
						--break
					end
				end
				if(not cust_ow_legal) then
					break
				end
			end
			if(not cust_ow_legal) then
				err_msg = "The 'Owner needs' field can not contain multiple times the same items, contact the shop owner."
			end
			if(err_msg == "") then --?shop configured well
				for i1, item1 in pairs(cust_og) do
					for i2, item2 in pairs(cust_og) do
						if (item1:get_name() == item2:get_name() and i1 ~= i2 and item1:get_name() ~= "") then
							cust_og_legal = false
							break
						end
					end
					if(not cust_og_legal) then
						break
					end
				end
				if(not cust_og_legal) then
					err_msg = "The 'Owner gives' field can not contain multiple times the same items, contact the shop owner."
				end
			end
			if(err_msg == "") then --?player has space
				local player_has_space = true
				for i, item in pairs(cust_og) do
					if (not player_inv:room_for_item("main",item)) then
						player_has_space = false
						break
					end
				end
				if(not player_has_space) then
					err_msg = "You do not have the space in your inventory."
				end
			end
			if(err_msg == "") then --?player has items
				local player_has_items = true
				for i, item in pairs(cust_ow) do
					if (not player_inv:contains_item("main",item)) then
						player_has_items = false
						break
					end
				end
				if(not player_has_items) then
					err_msg = "You do not have the needed items."
				end
			end
			if(err_msg == "") then --?shop has space
				local shop_has_space = true
				for i, item in pairs(cust_ow) do
					if (not shop_inv:room_for_item("custm",item)) then
						shop_has_space = false
						break
					end
				end
				if(not shop_has_space) then
					err_msg = "Exchange shop: The stock in the shop is full."
				end
			end
			if(err_msg == "") then --?shop has items
				local shop_has_items = true
				for i, item in pairs(cust_og) do
					if (not shop_inv:contains_item("stock",item)) then
						shop_has_items = false
						break
					end
				end
				if(not shop_has_items) then
					err_msg = "The shop is empty and can not give you anything."
				end
			end
			if(err_msg == "") then --?exchange
				local fully_exchanged = true
				for i, item in pairs(cust_ow) do
					player_inv:remove_item("main", item) --player inv. to stock else to eject fields
					if (shop_inv:room_for_item("custm",item)) then
						shop_inv:add_item("custm", item)
					else
						shop_inv:add_item("custm_ej", item)
						fully_exchanged = false
					end
				end
				for i, item in pairs(cust_og) do
					shop_inv:remove_item("stock", item) --stock to player inv. else to eject fields
					if (player_inv:room_for_item("main",item)) then
						player_inv:add_item("main", item)
					else
						shop_inv:add_item("cust_ej", item)
						fully_exchanged = false
					end
				end
				if(not fully_exchanged) then
					err_msg = "Fatal error! Stocks are overflowing somewhere!"
				end
			end
			if(err_msg ~= "") then
				minetest.chat_send_player(player_name, "Exchange shop: "..err_msg)
			end
		elseif(fields.vstock and bitchange_has_access(shop_owner, player_name) and not fields.quit) then
			minetest.show_formspec(sender:get_player_name(),"bitchange:shop_formspec",get_exchange_shop_formspec(3, pos, title))
		elseif(fields.vcustm and bitchange_has_access(shop_owner, player_name) and not fields.quit) then
			minetest.show_formspec(sender:get_player_name(),"bitchange:shop_formspec",get_exchange_shop_formspec(2, pos, title))
		elseif(fields.quit and bitchange_has_access(shop_owner, player_name)) then
			if(fields.title and title ~= fields.title) then
				if(fields.title ~= "") then
					meta:set_string("infotext", "Exchange shop \""..fields.title.."\" (owned by "..
						meta:get_string("owner")..")")
				else
					meta:set_string("infotext", "Exchange shop (owned by "..
						meta:get_string("owner")..")")
				end
				meta:set_string("title", fields.title)
			end
		end
	end
end)

minetest.register_node("bitchange:shop", {
	description = "Shop",
	tiles = {"bitchange_shop_top.png", "bitchange_shop_top.png",
			 "bitchange_shop_side.png", "bitchange_shop_side.png",
			 "bitchange_shop_side.png", "bitchange_shop_front.png"},
	paramtype2 = "facedir",
	groups = get_exchange_shop_tube_config(1),
	tube = get_exchange_shop_tube_config(2),
	sounds = default.node_sound_wood_defaults(),
	after_place_node = function(pos, placer)
		local meta = minetest.get_meta(pos)
		meta:set_string("owner", placer:get_player_name())
		meta:set_string("infotext", "Exchange shop (owned by "..
				meta:get_string("owner")..")")
	end,
	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("infotext", "Exchange shop (constructing)")
		meta:set_string("formspec", "")
		meta:set_string("owner", "")
		local inv = meta:get_inventory()
		inv:set_size("stock", 5*4) -- needed stock for exchanges
		inv:set_size("custm", 5*4) -- stock of the customers exchanges
		inv:set_size("custm_ej", 4) -- ejected items if shop has no inventory room
		inv:set_size("cust_ow", 2*2) -- owner wants
		inv:set_size("cust_og", 2*2) -- owner gives
		inv:set_size("cust_ej", 4) -- ejected items if player has no inventory room
	end,
	can_dig = function(pos,player)
		local meta = minetest.get_meta(pos);
		local inv = meta:get_inventory()
		if(inv:is_empty("stock") and inv:is_empty("custm") and inv:is_empty("custm_ej") and inv:is_empty("cust_ow") and inv:is_empty("cust_og") and inv:is_empty("cust_ej")) then
			return true
		else
			minetest.chat_send_player(player:get_player_name(), "Can not dig exchange shop, one or multiple stocks are in use.")
			return false
		end
	end,
	on_rightclick = function(pos, node, clicker, itemstack)
		local meta = minetest.get_meta(pos)
		local player_name = clicker:get_player_name()
		local view = 0
		exchange_shop[player_name] = pos
		if player_name == meta:get_string("owner") then
			if(clicker:get_player_control().aux1) then
				view = 1
			else
				view = 2
			end
		else
			view = 1
		end
		minetest.show_formspec(player_name,"bitchange:shop_formspec",get_exchange_shop_formspec(view, pos, meta:get_string("title")))
	end,
	allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		local meta = minetest.get_meta(pos)
		if (not bitchange_has_access(meta:get_string("owner"), player:get_player_name())) then
			return 0
		end
		return count
	end,
    allow_metadata_inventory_put = function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		if (bitchange_has_access(meta:get_string("owner"), player:get_player_name()) and (listname ~= "cust_ej") and (listname ~= "custm_ej")) then
			return stack:get_count()
		end
		return 0
	end,
    allow_metadata_inventory_take = function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		if (bitchange_has_access(meta:get_string("owner"), player:get_player_name()) or (listname == "cust_ej")) then
			return stack:get_count()
		end
		return 0
	end,
})

minetest.register_craft({
	output = 'bitchange:shop',
	recipe = {
		{'default:sign_wall'},
		{'default:chest_locked'},
	}
})