-- Important: This is only of relevance for the Server YourLand -
--            which was running an older version of this mod and nees
--            adjustments for the newer version.
---
-- Rename this file to
-- 	local_server_do_on_reload.lua
-- and execute
-- 	/npc_talk_migrate
-- in order to automaticly add the necessary privs for all existing old NPC.
--
-- NPC dialogs are checked and reported if broken.

yl_speak_up.migration_npc_needs_priv = function(n_id, pname, counter, priv_name)
	if(counter < 1) then
		return
	end
	-- does the NPC have the priv already?
	if(yl_speak_up.npc_has_priv(n_id, priv_name, nil)) then
		minetest.chat_send_player(pname, "      OK: "..tostring(n_id).." has priv "..priv_name)
		return
	end
	-- grant the NPC the priv
	minetest.chat_send_player(pname, "      GRANTING "..tostring(n_id).." priv "..priv_name)
	if(not(yl_speak_up.npc_priv_table[n_id])) then
		yl_speak_up.npc_priv_table[n_id] = {}
	end
	yl_speak_up.npc_priv_table[n_id][priv_name] = true
end


yl_speak_up.check_one_npc_for_migration = function(dialog, pname, n_id)
	-- nothing defined yet - nothing to repair
	if(not(dialog.n_dialogs)) then
		minetest.chat_send_player(pname, "    NPC "..tostring(n_id).." has nothing to say.")
		return
	end
	local c_effect_exec_lua = 0
	local c_effect_give_item = 0
	local c_effect_take_item = 0
	local c_effect_move_player = 0
	local c_precon_exec_lua = 0
	-- iterate over all dialogs
	for d_id, d in pairs(dialog.n_dialogs) do
		if(d_id and d and d.d_options) then
			-- iterate over all options
			for o_id, o in pairs(d.d_options) do
				if(o_id and o and o.o_results) then
					local dialog_results = {}
					-- iterate over all results
					for r_id, r in pairs(o.o_results) do
						if(r.r_type == "dialog") then
							table.insert(dialog_results, r_id)
						elseif(r.r_type == "function") then
							c_effect_exec_lua    = c_effect_exec_lua + 1
						elseif(r.r_type == "move") then
							c_effect_move_player = c_effect_move_player + 1
						elseif(r.r_type == "give_item") then
							c_effect_give_item   = c_effect_give_item + 1
						elseif(r.r_type == "take_item") then
							c_effect_take_item   = c_effect_take_item + 1
						end
					end
					if(#dialog_results>1) then
						local msg = "ERROR: Dialog "..
							tostring(d_id)..", option "..tostring(o_id)..
							", has multiple results of type dialog: "..
							minetest.serialize(dialog_results)..". Please "..
							"let someone with npc_master priv fix that first!"
						yl_speak_up.log_change(pname, n_id, msg, "error")
						if(pname) then
							minetest.chat_send_player(pname, msg)
						end
					end
				end
				if(o_id and o and o.o_prerequisites) then
					for p_id, p in pairs(o.o_prerequisites) do
						if(p.p_type == "function") then
							c_precon_exec_lua    = c_precon_exec_lua + 1
						end
					end
				end
			end
		end
	end
	yl_speak_up.migration_npc_needs_priv(n_id, pname, c_effect_exec_lua, "effect_exec_lua")
	yl_speak_up.migration_npc_needs_priv(n_id, pname, c_effect_give_item, "effect_give_item")
	yl_speak_up.migration_npc_needs_priv(n_id, pname, c_effect_take_item, "effect_take_item")
	yl_speak_up.migration_npc_needs_priv(n_id, pname, c_effect_move_player, "effect_move_player")
	yl_speak_up.migration_npc_needs_priv(n_id, pname, c_precon_exec_lua, "precon_exec_lua")
end


yl_speak_up.check_all_npc_for_migration = function(pname)
	local path = yl_speak_up.worldpath..yl_speak_up.path.."/"
	local file_names = minetest.get_dir_list(path, false)
	minetest.chat_send_player(pname, "There are "..tostring(#file_names).." NPCs with stored dialogs "..
		"in folder "..path..".")
	for i, fname in ipairs(file_names) do
		local file, err = io.open(path..fname, "r")
		io.input(file)
		local content = io.read()
		local dialog = minetest.parse_json(content)
		io.close(file)
		if type(dialog) ~= "table" then
			dialog = {}
		end
		minetest.chat_send_player(pname, "  Checking NPC "..tostring(fname).."...")
		yl_speak_up.check_one_npc_for_migration(dialog, pname, string.sub(fname, 0, -6)) 
	end
	minetest.chat_send_player(pname, "Done with checking all NPC files for migration.")
	-- store the changed privs
	yl_speak_up.npc_privs_store()
	return true
end


minetest.register_chatcommand( 'npc_talk_migrate', {
        description = "Checks NPC from old yl_speak_up for migration to new version of the mod.",
        privs = {npc_master = true},
        func = function(pname, param)
		return yl_speak_up.check_all_npc_for_migration(pname)
	end
})