local tm = {}
local config_by_name = {}

function on_game_start()
	RegisterScriptCallback("save_state",trade_save)
	RegisterScriptCallback("load_state",trade_load)
end

local function t2c(t)
	if not t then return nil end
	local ct = game.CTime()
	ct:set(t.Y,t.M,t.D,t.h,t.m,t.s,t.ms)
	return ct
end

local function c2t(ct)
	if not ct then return nil end
	-- printf('%s, %s',ct,type(ct))
	local Y, M, D, h, m, s, ms = 0, 0, 0, 0, 0, 0, 0
	Y, M, D, h, m, s, ms = ct:get(Y, M, D, h, m, s, ms)
	return { Y=Y, M=M, D=D, h=h, m=m, s=s, ms=ms }
end

function trade_init(npc, cfg)
	if not (db.actor) then 
		return 
	end 
	
	--[[ 
	No use having trade for enemies or zombied (no dialogs)
	Note: it matters if you desguise, because this is called once on NPC switching online. So this can block trading with traders in this case.
	if (npc:relation(db.actor) == game_object.enemy or npc:character_community() == "zombied") then 
		return 
	end
	--]]
	
	local id = npc:id()
	if (tm[id] and tm[id].cfg_ltx == cfg) then
		config_by_name[cfg] = config_by_name[cfg] or ini_file(cfg)
		return 
	end
	
	tm[id] = empty_table(tm[id])
	tm[id].cfg_ltx = cfg
	config_by_name[cfg] = config_by_name[cfg] or ini_file(cfg)
	if not (config_by_name[cfg]) then
		tm[id] = nil
	end
end

function setup_buy_sell_conditions(npc,id,config)
	local condlist = xr_logic.parse_condlist(npc, "trader", "buy_condition", config:r_string_ex("trader", "buy_condition") or "")
	local str = condlist and xr_logic.pick_section_from_condlist(db.actor, npc, condlist)
	if (str == nil or str == "" or str == "nil") then
		printf("Wrong section in buy_condition condlist for npc [%s]!", npc:name())
		return
	end
	
	npc:buy_condition(config, str)
	tm[id].current_buy_condition = str

	condlist = xr_logic.parse_condlist(npc, "trader", "sell_condition", config:r_string_ex("trader", "sell_condition") or "")
	str = condlist and xr_logic.pick_section_from_condlist(db.actor, npc, condlist)
	if(str == nil or str == "" or str == "nil") then
		printf("Wrong section in sell_condition condlist for npc [%s]!", npc:name())
		return
	end

	
	npc:sell_condition(config, str)
	tm[id].current_sell_condition = str

	condlist = xr_logic.parse_condlist(npc, "trader", "buy_item_condition_factor", config:r_string_ex("trader", "buy_item_condition_factor") or "0.7")
	str = condlist and xr_logic.pick_section_from_condlist(db.actor, npc, condlist)
	if (str == nil or str == "") then
		printf("Wrong section in buy_item_condition_factor condlist for npc [%s]!", npc:name())
		return 
	end
	
	str = tonumber(str) or 0.7
	
	if alife_storage_manager.get_state().trader_buy_condition_override and alife_storage_manager.get_state().trader_buy_condition_override > 0 then
		-- printf('@@@overridden %s', alife_storage_manager.get_state().trader_buy_condition_override/100)
		str = alife_storage_manager.get_state().trader_buy_condition_override/100
	end
	
	npc:buy_item_condition_factor(str)
	tm[id].current_buy_item_condition_factor = str

	condlist = xr_logic.parse_condlist(npc, "trader", "buy_item_exponent", config:r_string_ex("trader", "buy_item_exponent") or "0.75")
	str = condlist and xr_logic.pick_section_from_condlist(db.actor, npc, condlist)
	if (str == nil or str == "") then
		printf("Wrong section in buy_item_exponent condlist for npc [%s]!", npc:name())
		return 
	end
	
	str = tonumber(str) or 0.75
	npc:buy_item_exponent(str)
	tm[id].current_buy_item_exponent = str

	condlist = xr_logic.parse_condlist(npc, "trader", "sell_item_exponent", config:r_string_ex("trader", "sell_item_exponent") or "0.75")
	str = condlist and xr_logic.pick_section_from_condlist(db.actor, npc, condlist)
	if (str == nil or str == "") then
		printf("Wrong section in sell_item_exponent condlist for npc [%s]!", npc:name())
		return 
	end
	
	str = tonumber(str) or 0.75
	npc:sell_item_exponent(str)
	tm[id].current_sell_item_exponent = str
end 

function update(npc, force_refresh)
	local id = npc and npc:id()
	if not (id) then 
		return 
	end
	
	if not (tm[id] and tm[id].cfg_ltx) then 
		return
	end 
	
	local config = config_by_name[tm[id].cfg_ltx]
	if not (config) then
		return
	end
	
	setup_buy_sell_conditions(npc,id,config)
	
	if has_alife_info(npc:section().."_is_repairing") then
		return
	end

	local restock_time
	if force_refresh then
		restock_time = 0
	else
		restock_time = game_difficulties.get_eco_factor("restock") or 24
	end

	if (tm[id].resupply_time and game.get_game_time():diffSec(t2c(tm[id].resupply_time)) < (restock_time * 3600))  then
		return
	end
	tm[id].resupply_time = c2t(game.get_game_time())
	
	local str = config:r_string_ex("trader", "buy_supplies")
	if not (str) then 
		return -- no buy_supplies this is normal
	end

	local condlist = xr_logic.parse_condlist(npc, "trader", "buy_supplies", str)
	str = condlist and xr_logic.pick_section_from_condlist(db.actor, npc, condlist)
	if(str=="" or str==nil) then
		printf("Wrong section in buy_supplies condlist for npc [%s]!", npc:name())
		return
	end
	
	npc:buy_supplies(config, str)
	tm[id].current_buy_supplies = str
	
	if (not tm[id].checked) then
		tm[id].checked = true
		--utils_data.print_table(tm[id])
	end
end

function on_npc_death(npc)
	if (npc) then
		tm[npc:id()] = nil
	end
end

function trade_save(m_data)
	-- local t = {}
	-- copy_table(t,tm)
	-- for k,v in pairs(tm) do
		-- v.resupply_time = c2t(v.resupply_time)
	-- end
	m_data.trade_manager = tm
	-- trade_load(m_data)
end 

function trade_load(m_data)
	tm = m_data.trade_manager or {}
	-- for k,v in pairs(tm) do
		-- tm.resupply_time = t2c(tm.resupply_time)
	-- end
end

function get_trade_profile(id, key)
	if key then
		return tm[id] and tm[id][key]
	end
	return tm[id]
end

function get_trade_cfg(cfg)
	return config_by_name[cfg]
end

----------- NOT TO DELETE!!!!!!!!! called from engine
function get_buy_discount(npc_id)
	--utils_data.debug_write("get_buy_discount")
	if not (tm[npc_id] and tm[npc_id].cfg_ltx) then
		return 1
	end

	local config = config_by_name[tm[npc_id].cfg_ltx]
	local condlist = config and config:r_string_to_condlist("trader","discounts")
	local sect = condlist and xr_logic.pick_section_from_condlist(db.actor, nil, condlist)
	if (sect == nil or sect == "") then 
		return 1 
	end

	local factor = config:r_float_ex(sect,"buy") or 1
	local eco_factor = game_difficulties.get_eco_factor("buy") or 1
	
	factor = factor * eco_factor

	return factor
end
----------- NOT TO DELETE!!!!!!!!! called from engine
function get_sell_discount(npc_id)
	--utils_data.debug_write("get_sell_discount")
	if not (tm[npc_id] and tm[npc_id].cfg_ltx) then
		return 1
	end

	local config = config_by_name[tm[npc_id].cfg_ltx]
	local condlist = config and config:r_string_to_condlist("trader","discounts")
	local sect = condlist and xr_logic.pick_section_from_condlist(db.actor, nil, condlist)
	if (sect == nil or sect == "") then 
		return 1 
	end

	local factor = config:r_float_ex(sect,"sell") or 1
	local eco_factor = game_difficulties.get_eco_factor("sell") or 1
	
	
	factor = factor * eco_factor

	return factor
end