-- this is used by add_generic_dialogs.lua

-- a chat command to grant or deny or disallow npc these privs;
-- it is not checked if the NPC exists
minetest.register_chatcommand( 'npc_talk_generic', {
        description = "Lists, add or removes the dialogs of NPC <n_id> as generic dialogs.\n"..
		"Call:  [list|add|remove|reload] [<n_id>]",
        privs = {privs = true},
        func = function(pname, param)
		if(not(param) or param == "") then
			minetest.chat_send_player(pname, "Usage: [list|add|remove|reload] <n_id>")
			return
		end
		local parts = string.split(param, " ")
		local s = yl_speak_up.modstorage:get_string("generic_npc_list") or ""
		local generic_npc_list = string.split(s, " ")
		if((parts[1] == "add" or parts[1] == "remove") and #parts == 2) then
			local do_reload = false
			local i = table.indexof(generic_npc_list, parts[2])
			if(parts[1] == "add" and i == -1) then
				local n_id = parts[2]
				table.insert(generic_npc_list, n_id)
				local dialog = yl_speak_up.load_dialog(n_id, false)
				local res = yl_speak_up.check_and_add_as_generic_dialog(dialog, n_id)
				minetest.chat_send_player(pname, "Adding NPC "..tostring(n_id).."..: "..tostring(res))
				do_reload = true
			elseif(parts[1] == "add" and i ~= -1) then
				minetest.chat_send_player(pname, "NPC "..tostring(parts[2])..
					" is already registered as a generic NPC. You may try to "..
					"remove and add it again if something went wrong.")
			elseif(parts[1] == "remove" and i ~= -1) then
				table.remove(generic_npc_list, i)
				minetest.chat_send_player(pname, "Removing NPC "..tostring(parts[2]).." ..")
				do_reload = true
				yl_speak_up.generic_dialogs[parts[2]] = nil
				yl_speak_up.generic_dialog_conditions[parts[2]] = nil
			elseif(parts[1] == "reload") then
				do_reload = true
			end
			-- actually reload the NPC list
			if(do_reload) then
				-- store the updated version
				yl_speak_up.modstorage:set_string("generic_npc_list",
					table.concat(generic_npc_list, " "))
				yl_speak_up.load_generic_dialogs()
			end
		elseif(parts[1] ~= "list" and parts[1] ~= "reload") then
			minetest.chat_send_player(pname, "Usage: [list|add|remove|reload] <n_id>")
			return
		end
		local liste = {}
		for n_id, v in pairs(yl_speak_up.generic_dialogs) do
			table.insert(liste, n_id)
		end
		if(#liste < 1) then
			minetest.chat_send_player(pname, "No NPC provides generic dialogs.")
		else
			minetest.chat_send_player(pname, "These NPC provide generic dialogs: "..
				table.concat(liste, ", ")..".")
		end
		return
	end
})