-- Copyright (C) 2021 Free Software Foundation

-- This file is part of Emeraldbank Minetest Mod.

-- Emeraldbank is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.

-- Emeraldbank is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.

-- You should have received a copy of the GNU General Public License
-- along with Emeraldbank.  If not, see <https://www.gnu.org/licenses/>.



local S = core.get_translator(core.get_current_modname())

local stock_h = 3
local stock_w = 5

local formspec_prefix = "emeraldbank:shop_formspec"

emeraldbank.player_inv =
   "list[current_player;main;0,4.5;9,3;9]"..
   mcl_formspec.get_itemslot_bg(0,4.5,9,3)..
   "list[current_player;main;0,7.74;9,1;]"..
   mcl_formspec.get_itemslot_bg(0,7.74,9,1)..
   "listring[current_player;main]"


function emeraldbank.get_shop_fs(pos, clicker)
   local meta = core.get_meta(pos)
   local price = meta:get_int("price")
   local shop_item = meta:get_string("shop_item")
   local list_name = "nodemeta:"..pos.x..','..pos.y..','..pos.z
   local pname = clicker:get_player_name()
   local owner = meta:get_string("owner")
   local player_press_key = clicker:get_player_control().aux1
   local shop_fs = ""
   if pname == owner and not player_press_key then
      shop_fs = "size[9,8.75]"..
	 "label[0,0;"..S("Your stock:").."]"..
	 "list["..list_name..";stock;0,0.5;"..stock_w..","..stock_h..";]"..
	 mcl_formspec.get_itemslot_bg(0,0.5,stock_w,stock_h)..
	 "field[6.5,3;2,1;price;"..S("Price")..";"..price.."]"..
	 "label[6,0;"..S("In exchange, you give:").."]"..
	 "item_image[6.5,0.5;1,1;"..shop_item.."]"..
	 mcl_formspec.get_itemslot_bg(6.5,0.5,1,1)..
	 "label[0,4;"..S("Owner, Use (special key + right mouse button) for customer interface").."]"..
	 emeraldbank.player_inv
   else
      shop_fs = "size[9,8.75]"..
	 "label[3.7,0;"..S("Owner gives:").."]"..
	 "item_image[4,1;1,1;"..shop_item.."]"..
	 mcl_formspec.get_itemslot_bg(4,1,1,1)..
	 "label[4,2;"..S("Price: @1", price).."]"..
	 "button[3.5,3;2,1;exchange;"..S("Exchange").."]"..
	 emeraldbank.player_inv
   end
      
   return shop_fs

end


local function set_item(pos, listname, index, stack, player)
   local meta = core.get_meta(pos)
   local itemname = stack:get_name()
   local itemcount = stack:get_count()
   meta:set_string("shop_item", itemname)
   core.show_formspec(player:get_player_name(), formspec_prefix..core.pos_to_string(pos), emeraldbank.get_shop_fs(pos, player) )
end

local function check_empty(pos, listname, index, stack, player)
   local meta = core.get_meta(pos)
   local inv = meta:get_inventory()
   if inv:is_empty("stock") then
      meta:set_string("shop_item", "")
   end
   core.show_formspec(player:get_player_name(), formspec_prefix..core.pos_to_string(pos), emeraldbank.get_shop_fs(pos, player) )
end

local function get_stonks(pos, player)
   local name = player:get_player_name()
   local meta = core.get_meta(pos)
   local owner = meta:get_string("owner")
   local stonks = meta:get_int("stonks")
   if name == owner and stonks > 0 then
      emeraldbank.add_emeralds(player, stonks)
      meta:set_int("stonks", 0)
      core.chat_send_player(name, S("You've earned @1 Emeralds with this shop.", stonks) )
   end
end


-- register shop node
core.register_node("emeraldbank:shop", {
      description = S("Shop"),
      _doc_items_longdesc = S("A shop to sell your items with emeralds."),
      is_ground_content = false,
      tiles = {
	 "default_tree.png",
	 "default_tree.png",
	 "default_tree.png^mcl_core_emerald.png"
      },
      stack_max = 64,
      groups = {axey=1, handy=1, building_block=1, enderman_takable=1},
      sounds = mcl_sounds.node_sound_wood_defaults(),
      _mcl_blast_resistance = 5,
      _mcl_hardness = 1,
            
      after_place_node = function(pos, placer, itemstack)
	 local owner = placer:get_player_name()
	 local meta = core.get_meta(pos)
	 meta:set_string("infotext", S("Exchange shop (owned by @1)", owner))
	 meta:set_string("owner", owner)
	 local inv = meta:get_inventory()
	 inv:set_size("stock", stock_w*stock_h)
      end,

      on_rightclick = function(pos, node, clicker, itemstack)
	 get_stonks(pos, clicker)
	 core.show_formspec(clicker:get_player_name(), formspec_prefix..core.pos_to_string(pos), emeraldbank.get_shop_fs(pos, clicker) )
      end,

      on_punch = function(pos, node, puncher, pointed_thing)
	 get_stonks(pos, puncher)
      end,
      
      on_metadata_inventory_put = set_item,

      on_metadata_inventory_take = check_empty,
		  
      can_dig = function(pos, player)
	 local name = player:get_player_name()
	 local meta = core.get_meta(pos)
	 local owner = meta:get_string("owner")
	 local inv = meta:get_inventory()
	 if inv:is_empty("stock") and name == owner then
	    return true
	 end
      end
      
})


core.register_on_player_receive_fields(function(sender, formname, fields)
      local prefix_len = string.len(formspec_prefix)
      if formname:sub(1,prefix_len) == formspec_prefix then

	 local pos_string = formname:sub(prefix_len+1)
	 local pos = core.string_to_pos(pos_string)
	 local meta = core.get_meta(pos)
	 local name = sender:get_player_name()
	 local playermeta = sender:get_meta()
	 local player_pos = sender:get_pos()
	 local old_price = meta:get_int("price")
	 local new_price = tonumber(fields.price)
	 local shop_item = meta:get_string("shop_item")
	 local minv = meta:get_inventory()
	 local pinv = sender:get_inventory()
	 local bankemeralds = playermeta:get_int("emeraldbank:emerald")
	 
	 if fields.price and string.find(fields.price, "^[0-9]+$") then
	    if new_price >= 1 and new_price <= 10000 and new_price ~= meta:get_int("price") then
	       meta:set_int("price", new_price)
	    end
	 end
	 
	 if fields.exchange ~= nil and fields.exchange ~= "" then

	    if meta:get_string("owner") == name then

	       core.chat_send_player(name, S("This is your own shop, you can't exchange to yourself!"))

	    else
	       
	       local stocklist = minv:get_list("stock")
	       local can_exchange = true

	       if bankemeralds < old_price then
		  can_exchange = false
		  core.chat_send_player(name, S("Not enough Emeralds in your account") )
	       end
	       
	       if not minv:contains_item("stock", shop_item) then
		  can_exchange = false
		  core.chat_send_player(name, S("Out of Stock!") )
	       end
	       
	       if can_exchange then
		  minv:remove_item("stock", shop_item)
		  core.add_item(player_pos, shop_item)
		  emeraldbank.add_emeralds(sender, -old_price)
		  meta:set_int("stonks", meta:get_int("stonks")+old_price)
		  core.chat_send_player(name, S("Exchanged!"))
		  core.show_formspec(sender:get_player_name(), formspec_prefix..core.pos_to_string(pos), emeraldbank.get_shop_fs(pos, sender) )
	       end
	       
	    end
	    
	 end
	 
      end      
end)