-- this contains custom functions that you can override on your server
-- please take a look at the example code!

-- replace some variables in the text the NPC speaks and which the player can use to reply
-- pname: the name of the player that is talking to the NPC;
-- Note: If you want to change this function, best call the original as well after
--       applying your custom changes.
yl_speak_up.replace_vars_in_text = function(text, dialog, pname)
	local subs = {
		MY_NAME = dialog.n_npc,
		NPC_NAME = dialog.n_npc,
		OWNER_NAME = dialog.npc_owner,
		PLAYER_NAME = pname,
	}

	local day_time_name = "day"
	local day_time = minetest.get_timeofday()
	if(day_time < 0.5) then
		day_time_name = "morning"
	elseif(day_time < 0.75) then
		day_time_name = "afternoon"
	else
		day_time_name = "evening"
	end
	subs.GOOD_DAY = "Good "..day_time_name
	subs.good_DAY = "good "..day_time_name

	-- Note: the $ char is a special one. It needs to be escaped with %$ in lua.
	-- Note: when substitution argument is a table, we look up
	-- substitutions in it using substring captured by "()" in
	-- pattern. "[%a_]+" means one or more letter or underscore.
	-- If lookup returns nil, then no substitution is made.
	text = string.gsub(text, "%$([%a_]+)%$", subs)

	return text
end


-- a custom precondition;
-- has to return either true (=precondition is fulfilled) or false (=precondition is not fulfilled)
-- Note: This function will be called often. Make it efficient!
yl_speak_up.precondition_custom = function(player, param)
	minetest.chat_send_player(player:get_player_name(),
		"Checking custom precondition with parameter \""..tostring(param).."\"..")
	-- return if your precondition is fulfilled (true) or not (false)
	return true
end


-- a custom effect;
-- has to return true (=effect was executed successfully) or false (=effect failed for some reason)
yl_speak_up.effect_custom = function(player, param)
	minetest.chat_send_player(player:get_player_name(),
		"Executing custom effect with parameter \""..tostring(param).."\"..")
	-- return true if your effect executed successfuly, and false if not
	-- (only relevant for following on_failure effects)
        return true
end


-- a custom action (the formspec shown to the player);
-- overwrite this function on your server with a custom one that shows the formspec
-- that you want!
yl_speak_up.get_fs_action_custom = function(player, param)
	local pname = player:get_player_name()
	local dialog = yl_speak_up.speak_to[pname].dialog
	return "size[8.5,4.0]"..
		"button[0.2,0.0;2.0,0.9;back_to_talk;Back to talk]"..
		"button[4.75,0.0;3.0,0.9;finished_action;Stare back]"..
		"button[4.75,0.8;3.0,0.9;failed_action;Fail to stare back]"..
		"tooltip[back_to_talk;Click here if you want to abort/cancel.]"..
		"tooltip[failed_action;Click here if you want the action to FAIL.]"..
		"tooltip[finished_action;Click here if you want the action to be a SUCCESS.]"..
		"label[0.5,1.7;"..minetest.formspec_escape(
			"["..(dialog.n_npc or "- ? -").." stares expectantly at you.]").."]"..
		"label[0.5,2.5;Your custom parameter is:]"..
		"label[1.5,3.0;"..minetest.formspec_escape(tostring(param)).."]"..
		"label[0.5,3.5;Overwrite this function with a custom one!]"
end


-- a custom action (checking of the input);
-- overwrite this function on your server with a custom one that checks the
-- input to your formspec - but don't forget to call the necessary functions
-- as shown here
yl_speak_up.input_fs_action_custom = function(player, formname, fields)
	-- back from error_msg? then show the formspec again
	if(fields.back_from_error_msg) then
		yl_speak_up.show_fs(player, "action_custom", nil)
		return
	end
	local pname = player:get_player_name()
	local a_id = yl_speak_up.speak_to[pname].a_id
	if(fields.back_to_talk) then
		-- the action was aborted
		yl_speak_up.execute_next_action(player, a_id, nil)
		return
	end
	if(fields.failed_action) then
		-- the action failed
		yl_speak_up.execute_next_action(player, a_id, false)
		return
	end
	if(fields.finished_action) then
		-- the action was a success
		yl_speak_up.execute_next_action(player, a_id, true)
		return
	end
	-- else show a message to the player that he ought to decide
	yl_speak_up.show_fs(player, "msg", {
		input_to = "yl_speak_up:action_custom",
		formspec = "size[7,1.0]"..
			"label[0.2,-0.2;"..
				"Please click either on \"Stare back\" or \"Back to talk\"!]"..
				"button[2,0.5;1.5,0.9;back_from_error_msg;Back]"})
end