-- A telling machine. Call this file with the exchange argument.
local exchange = ...

local atm_form = "global_exchange:atm_form"

local main_menu =[[
size[6,1]
button[0,0;2,1;new_account;New Account]
button[2,0;2,1;info;Account Info]
button[4,0;2,1;wire;Wire Monies]
]]


local function logout(x,y)
	return "button[" .. x .. "," .. y ..
		";2,1;logout;Log Out]"
end


local function label(x,y,text)
	return "label[" .. x .. "," .. y .. ";"
		.. minetest.formspec_escape(text) .. "]"
end

local function field(x,y, w,h, name, label, default)
	return "field[" .. x .. "," .. y .. ";" .. w .. "," .. h .. ";"
		.. name .. ";" .. minetest.formspec_escape(label) .. ";"
		.. minetest.formspec_escape(default) .. "]"
end

local unique_num = 1

local function unique()
	local ret = unique_num
	unique_num = unique_num + 1

	return ret
end


local function new_account_fs(p_name)
	local fs = "size[4,3]"

	local act_suc, err = exchange:new_account(p_name)

	if not act_suc then
		fs = fs .. label(0.5,0.5, "Error: " .. err)
	else
		fs = fs .. label(0.5,0.5, "Congratulations on \nyour new account.")
	end

	fs = fs .. logout(0.5,2)

	return fs
end


local function info_fs(p_name)
	local balance = exchange:get_balance(p_name)

	local fs = "size[4,3]"

	if not balance then
		fs = fs .. label(0.5,0.5, "You don't have an account.")
	else
		fs = fs .. label(0.5,0.5, "Balance: " .. balance)
	end

	fs = fs .. logout(0.5,2)

	return fs
end


local function wire_fs(p_name)
	local balance = exchange:get_balance(p_name)

	local fs = "size[4,5]"
	fs = fs .. logout(0,4)

	if not balance then
		fs = fs .. label(0.5,0.5, "You don't have an account.")
		return fs
	end

	-- To prevent duplicates
	fs = fs .. field(-100, -100, 0,0, "trans_id", "", unique())
	fs = fs .. label(0.5,0.5, "Balance: " .. balance)
	fs = fs .. field(0.5,1.5, 2,1, "recipient", "Send to:", "")
	fs = fs .. field(0.5,2.5, 2,1, "amount", "Amount", "")
	fs = fs .. "button[2,4;2,1;send;Send]"

	return fs
end


local function send_fs(p_name, receiver, amt_str)
	local fs = "size[7,3]"

	local amt = tonumber(amt_str)

	if not amt or amt <= 0 then
		fs = fs .. label(0.5,0.5, "Invalid transfer amount.")
		fs = fs .. "button[0.5,2;2,1;wire;Back]"
		
		return fs
	end
	
	local succ, err = exchange:transfer_credits(p_name, receiver, amt)

	if not succ then
		fs = fs .. label(0.5,0.5, "Error: " .. err)
		fs = fs .. "button[0.5,2;2,1;wire;Back]"
	else
		fs = fs.. label(0.5,0.5, "Successfully sent "
					.. amt .. " credits to " .. receiver)
		fs = fs .. "button[0.5,2;2,1;wire;Back]"
	end

	return fs
end


local trans_ids = {}


local function handle_fields(player, formname, fields)
	if formname ~= atm_form then return end
	if fields["quit"] then return true end

	local p_name = player:get_player_name()

	local this_id = fields.trans_id

	if this_id and this_id == trans_ids[p_name] then
		return true
	end

	trans_ids[p_name] = this_id

	if fields["logout"] then
		minetest.show_formspec(p_name, atm_form, main_menu)
	end

	if fields["new_account"] then
		minetest.show_formspec(p_name, atm_form, new_account_fs(p_name))
	end

	if fields["info"] then
		minetest.show_formspec(p_name, atm_form, info_fs(p_name))
	end

	if fields["wire"] then
		minetest.show_formspec(p_name, atm_form, wire_fs(p_name))
	end

	if fields["send"] then
		minetest.show_formspec(p_name, atm_form,
				       send_fs(p_name, fields.recipient, fields.amount))
	end

	return true
end


minetest.register_on_player_receive_fields(handle_fields)


minetest.register_node("global_exchange:atm", {
	description = "ATM",
	tiles = {"global_exchange_atm_top.png",
		 "global_exchange_atm_top.png",
		 "global_exchange_atm_side.png",
	},
	groups = {cracky=2},
	on_rightclick = function(pos, node, clicker)
		local p_name = clicker:get_player_name()

		minetest.show_formspec(p_name, atm_form, main_menu)
	end,
})