using System;
using System.Collections.Generic;
using System.IO;
using UnityEngine;

[System.Serializable]
public struct GShopBuyOption
{
    public uint price;           // Item price
    public uint endTime;         // End time (year/month/day/hour/minute/second)
    public uint time;            // Duration in seconds (0 = permanent)
    public uint startTime;       // Start time
    public int type;             // Time type: 0=permanent, 1=weekly, 2=monthly, -1=invalid
    public uint day;             // Day mask for weekly/monthly
    public uint status;          // Item status: 0=none, 1=hot, 2=new, 3=recommended, 4-12=discount levels, 13=sold out
    public uint flag;            // Additional flags
}

[System.Serializable]
public struct GShopItem
{
    public int localId;          // Localization ID
    public int mainType;         // Main category index
    public int subType;          // Sub-category index
    public string icon;          // Icon file path (128 chars)
    public uint id;              // Item object ID
    public uint num;             // Item quantity
    public GShopBuyOption[] buy; // Up to 4 different pricing options
    public string desc;          // Item description (512 chars)
    public string name;          // Item display name (32 chars)
    public uint idGift;          // Gift item ID
    public uint giftNum;         // Gift quantity
    public uint giftTime;        // Gift duration
    public uint logPrice;        // Log price
    public uint[] ownerNpcs;     // NPCs that own this item (8 max)
}

[System.Serializable]
public struct GShopMainType
{
    public string name;          // Main category name (64 chars)
    public List<string> subTypes; // Sub-category names
}

public class GShopData
{
    public List<GShopItem> items;
    public List<GShopMainType> mainTypes;
    public uint timestamp;
    
    public GShopData()
    {
        items = new List<GShopItem>();
        mainTypes = new List<GShopMainType>();
        timestamp = 0;
    }
}

// Extension methods for BinaryReader
public static class BinaryReaderExtensions
{
    public static string ReadString(this BinaryReader reader, int length)
    {
        byte[] bytes = reader.ReadBytes(length);
        return System.Text.Encoding.UTF8.GetString(bytes).TrimEnd('\0');
    }
    
    public static string ReadWideString(this BinaryReader reader, int length)
    {
        byte[] bytes = reader.ReadBytes(length * 2); // Wide chars are 2 bytes each
        return System.Text.Encoding.Unicode.GetString(bytes).TrimEnd('\0');
    }
}