using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace MV485.util
{
    public class BinInspector
    {
        public static void Inspect2(string binFilePath)
        {
            Console.WriteLine($"检查文件: {binFilePath}");

            using (var fs = new FileStream(binFilePath, FileMode.Open, FileAccess.Read))
            using (var reader = new BinaryReader(fs))
            {
                // 1. 检查 Header
                var header = ImageHeader.FromBinaryReader(reader);
                if (header.Magic != 0x96f3b83d)
                {
                    Console.WriteLine("❌ Header Magic 错误！");
                    return;
                }

                Console.WriteLine($"✅ Header Magic 正常: 0x{header.Magic:X8}");
                Console.WriteLine($"版本: v{header.VersionMajor}.{header.VersionMinor}.{header.VersionRevision} (Build {header.VersionBuildNum})");
                Console.WriteLine($"Header大小: 0x{header.HeaderSize:X} ({header.HeaderSize} 字节)");
                Console.WriteLine($"正文大小: {header.ImageSize} 字节");

                // 2. 读取 header + body
                fs.Position = 0;
                var fullHeader = reader.ReadBytes(header.HeaderSize);
                var body = reader.ReadBytes((int)header.ImageSize);

                // 3. 检查 TLV
                var tlvInfo = TlvInfo.FromBinaryReader(reader);
                if (tlvInfo.Magic != 0x6907)
                {
                    Console.WriteLine("❌ TLV Magic 错误！");
                    return;
                }
                Console.WriteLine($"✅ TLV Magic 正常: 0x{tlvInfo.Magic:X4}");
                Console.WriteLine($"TLV总长度: {tlvInfo.TotalLength} 字节");

                int tlvRemaining = tlvInfo.TotalLength - 4;
                Console.WriteLine("解析 TLV Entries:");
                byte[] sha256Value = null;

                while (tlvRemaining > 0)
                {
                    var entry = TlvEntry.FromBinaryReader(reader);
                    Console.WriteLine($"- Type: 0x{entry.Type:X2}, Length: {entry.Length} 字节");

                    if (entry.Type == 0x10 && entry.Length == 32) // SHA256
                    {
                        sha256Value = entry.Value;
                    }

                    tlvRemaining -= 4 + entry.Length;
                }

                if (sha256Value == null)
                {
                    Console.WriteLine("❌ 没有找到 SHA256 校验值！");
                    return;
                }

                string expectedHash = BitConverter.ToString(sha256Value).Replace("-", "").ToLowerInvariant();

                // 4. 验证 SHA256
                using (var sha = SHA256.Create())
                {
                    var actualHash = sha.ComputeHash(fullHeader.Concat(body).ToArray());
                    string actualHashHex = BitConverter.ToString(actualHash).Replace("-", "").ToLowerInvariant();

                    Console.WriteLine($"期望SHA256: {expectedHash}");
                    Console.WriteLine($"实际SHA256:  {actualHashHex}");

                    if (expectedHash == actualHashHex)
                        Console.WriteLine("✅ SHA256 校验成功！");
                    else
                        Console.WriteLine("❌ SHA256 校验失败！");
                }
            }
        }


        public static bool Inspect(string binFilePath)
        {
            Console.WriteLine($"检查文件: {binFilePath}");

            using (var fs = new FileStream(binFilePath, FileMode.Open, FileAccess.Read))
            using (var reader = new BinaryReader(fs))
            {
                try
                {
                    // 1. 检查 Header
                    var header = ImageHeader.FromBinaryReader(reader);
                    if (header.Magic != 0x96f3b83d)
                    {
                        Console.WriteLine("❌ Header Magic 错误！");
                        return false;
                    }

                    Console.WriteLine($"✅ Header Magic 正常: 0x{header.Magic:X8}");
                    Console.WriteLine($"版本: v{header.VersionMajor}.{header.VersionMinor}.{header.VersionRevision} (Build {header.VersionBuildNum})");
                    Console.WriteLine($"Header大小: 0x{header.HeaderSize:X} ({header.HeaderSize} 字节)");
                    Console.WriteLine($"正文大小: {header.ImageSize} 字节");

                    // 2. 验证 文件名最后6位数字
                    var fileName = Path.GetFileNameWithoutExtension(binFilePath);
                    if (fileName.Length < 6)
                    {
                        Console.WriteLine("❌ 文件名太短，无法解析版本号！");
                        return false;
                    }

                    string last6Digits = fileName.Substring(fileName.Length - 6); // 最后6位
                    if (!int.TryParse(last6Digits, out _))
                    {
                        Console.WriteLine("❌ 文件名最后6位不是纯数字！");
                        return false;
                    }

                    int major = int.Parse(last6Digits.Substring(0, 2));
                    int minor = int.Parse(last6Digits.Substring(2, 2));
                    int revision = int.Parse(last6Digits.Substring(4, 2));

                    if (header.VersionMajor != major || header.VersionMinor != minor || header.VersionRevision != revision)
                    {
                        Console.WriteLine($"❌ 版本号不匹配！文件名版本: {major}.{minor}.{revision}，Header版本: {header.VersionMajor}.{header.VersionMinor}.{header.VersionRevision}");
                        return false;
                    }

                    Console.WriteLine($"✅ 文件名版本与Header版本一致: v{major}.{minor}.{revision}");

                    // 3. 读取 header + body
                    fs.Position = 0;
                    var fullHeader = reader.ReadBytes(header.HeaderSize);
                    var body = reader.ReadBytes((int)header.ImageSize);

                    // 4. 检查 TLV
                    var tlvInfo = TlvInfo.FromBinaryReader(reader);
                    if (tlvInfo.Magic != 0x6907)
                    {
                        Console.WriteLine("❌ TLV Magic 错误！");
                        return false;
                    }
                    Console.WriteLine($"✅ TLV Magic 正常: 0x{tlvInfo.Magic:X4}");
                    Console.WriteLine($"TLV总长度: {tlvInfo.TotalLength} 字节");

                    int tlvRemaining = tlvInfo.TotalLength - 4;
                    Console.WriteLine("解析 TLV Entries:");
                    byte[] sha256Value = null;

                    while (tlvRemaining > 0)
                    {
                        var entry = TlvEntry.FromBinaryReader(reader);
                        Console.WriteLine($"- Type: 0x{entry.Type:X2}, Length: {entry.Length} 字节");

                        if (entry.Type == 0x10 && entry.Length == 32) // SHA256
                        {
                            sha256Value = entry.Value;
                        }

                        tlvRemaining -= 4 + entry.Length;
                    }

                    if (sha256Value == null)
                    {
                        Console.WriteLine("❌ 没有找到 SHA256 校验值！");
                        return false;
                    }

                    string expectedHash = BitConverter.ToString(sha256Value).Replace("-", "").ToLowerInvariant();

                    // 5. 验证 SHA256
                    using (var sha = SHA256.Create())
                    {
                        var actualHash = sha.ComputeHash(fullHeader.Concat(body).ToArray());
                        string actualHashHex = BitConverter.ToString(actualHash).Replace("-", "").ToLowerInvariant();

                        Console.WriteLine($"期望SHA256: {expectedHash}");
                        Console.WriteLine($"实际SHA256:  {actualHashHex}");

                        if (expectedHash != actualHashHex)
                        {
                            Console.WriteLine("❌ SHA256 校验失败！");
                            return false;
                        }

                        Console.WriteLine("✅ SHA256 校验成功！");
                    }

                    Console.WriteLine("✅ 文件检查全部通过！");
                    return true;
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"❌ 检查出错: {ex.Message}");
                    return false;
                }
            }
        }


    }
    ///////////////////////////////////////
}