SignManager.cs

﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using TShockAPI;
using Terraria;

namespace SignControl
{
    internal class SignManager
    {
        private static readonly Sign[] Signs = new Sign[Terraria.Sign.maxSigns];
        private static readonly string ControlDirectory = Path.Combine(TShock.SavePath, "signcontrol");
        private static readonly string SavePath = Path.Combine(ControlDirectory, Main.worldID + ".txt");

        //TODO: add signs to db

        public static Sign GetSign(int id)
        {
            return Signs[id];
        }

        public static void AddSign(Sign sign)
        {
            SetSign(sign.GetID(), sign);
        }

        public static void SetSign(int id, Sign sign)
        {
            if (Signs.Length > id)
                Signs[id] = sign;
        }

        public static void Load()
        {
            if (!Directory.Exists(ControlDirectory))
                Directory.CreateDirectory(ControlDirectory);

            if (!File.Exists(SavePath))
                File.Create(SavePath).Close();

            var error = false;
            foreach (var args in File.ReadAllLines(SavePath).Select(line => line.Split('|')).Where(args => args.Length >= 4))
            {
                try
                {
                    var sign = new Sign();

                    sign.SetID(int.Parse(args[0]));
                    sign.SetPosition(new Vector2(int.Parse(args[1]), int.Parse(args[2])));
                    sign.SetPassword(args[3], args[3] != "");

                    if (args.Length == 5)
                        sign.SetWarp(args[4]);

                    //check if sign still exists in world
                    var id = Terraria.Sign.ReadSign((int)sign.GetPosition().X, (int)sign.GetPosition().Y);
                    if (id != 1)
                    {
                        //the id of sign changed
                        if (id != sign.GetID())
                            sign.SetID(id);

                        //add to array
                        AddSign(sign);
                    }
                }
                catch
                {
                    error = true;
                }
            }

            //TODO: lazy loading of signs ( null checks )
            //fill empty slots
            for (var i = 0; i < Signs.Length; i++)
            {
                if (Signs[i] == null)
                {
                    Signs[i] = new Sign();
                    Signs[i].SetID(i);
                }
            }

            if (error)
                Console.WriteLine("Failed to load some sign data, corresponding signs will be left unprotected.");
        }

        public static void Save()
        {
            File.WriteAllLines(SavePath, (from sign in Signs
                                          where sign != null
                                          where sign.IsLocked() || sign.IsWarping()
                                          select string.Format("{0}|{1}|{2}|{3}|{4}", sign.GetID(), sign.GetPosition().X, sign.GetPosition().Y, sign.GetPassword(), sign.GetWarp())).ToArray());
        }
    }
}