using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;
using WhiteMagic;
using WhiteMagic.Execution;

namespace WhiteMagic.Examples;

/// <summary>
/// Sample struct for demonstrating struct marshalling
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct PlayerInfo
{
    public int Health;
    public float PositionX;
    public float PositionY;
    public int Level;
    public uint Experience;
}

/// <summary>
/// Example 1: Basic Memory Operations
/// Demonstrates reading and writing memory of various types
/// </summary>
public class BasicMemoryOperations
{
    /// <summary>
    /// Target process for examples (Notepad is safe and always available)
    /// </summary>
    private static Process? TargetProcess()
    {
        // Try to find Notepad
        var processes = Process.GetProcessesByName("notepad");
        if (processes.Length > 0)
            return processes[0];

        Console.WriteLine("No Notepad process found. Please launch Notepad first.");
        return null;
    }

    /// <summary>
    /// Example 1.1: Reading and writing primitive types
    /// </summary>
    public static void ReadWritePrimitives()
    {
        Console.WriteLine("=== Example 1.1: Read/Write Primitives ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        // Example: Read an integer from a hypothetical address
        // (In real use, you'd find the actual address via pattern scanning or offsets)
        IntPtr testAddress = magic.Memory.ImageBase + 0x1000;

        // Read different primitive types
        try
        {
            int intValue = magic.Memory.Read<int>(testAddress);
            Console.WriteLine($"Read int from 0x{testAddress:X}: {intValue}");

            float floatValue = magic.Memory.Read<float>(testAddress);
            Console.WriteLine($"Read float from 0x{testAddress:X}: {floatValue}");

            double doubleValue = magic.Memory.Read<double>(testAddress);
            Console.WriteLine($"Read double from 0x{testAddress:X}: {doubleValue}");

            bool boolValue = magic.Memory.Read<bool>(testAddress);
            Console.WriteLine($"Read bool from 0x{testAddress:X}: {boolValue}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Note: Read failed (address may be invalid): {ex.Message}");
        }

        // Write example
        bool writeSuccess = magic.Memory.Write(testAddress, 42);
        Console.WriteLine($"Write to 0x{testAddress:X}: {(writeSuccess ? "Success" : "Failed")}");
    }

    /// <summary>
    /// Example 1.2: Reading and writing arrays
    /// </summary>
    public static void ReadWriteArrays()
    {
        Console.WriteLine("\n=== Example 1.2: Read/Write Arrays ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        IntPtr arrayAddress = magic.Memory.ImageBase + 0x2000;

        // Read array of integers
        try
        {
            int[] intArray = magic.Memory.Read<int>(arrayAddress, 10);
            Console.WriteLine($"Read {intArray.Length} integers from 0x{arrayAddress:X}");
            Console.WriteLine($"First few values: {string.Join(", ", intArray[..Math.Min(5, intArray.Length)])}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Note: Array read failed (address may be invalid): {ex.Message}");
        }

        // Write array of integers
        int[] writeArray = { 1, 2, 3, 4, 5 };
        bool writeSuccess = magic.Memory.Write(arrayAddress, writeArray);
        Console.WriteLine($"Write {writeArray.Length} integers to 0x{arrayAddress:X}: {(writeSuccess ? "Success" : "Failed")}");
    }

    /// <summary>
    /// Example 1.3: Reading and writing strings
    /// </summary>
    public static void ReadWriteStrings()
    {
        Console.WriteLine("\n=== Example 1.3: Read/Write Strings ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        IntPtr stringAddress = magic.Memory.ImageBase + 0x3000;

        // Read ANSI string
        string ansiString = magic.Memory.ReadString(stringAddress, Encoding.ASCII, maxLength: 256);
        Console.WriteLine($"Read ANSI string from 0x{stringAddress:X}: \"{ansiString}\"");

        // Read Unicode string
        string unicodeString = magic.Memory.ReadString(stringAddress, Encoding.Unicode, maxLength: 256);
        Console.WriteLine($"Read Unicode string from 0x{stringAddress:X}: \"{unicodeString}\"");

        // Write string
        bool writeSuccess = magic.Memory.WriteString(stringAddress, "Hello, WhiteMagic!", Encoding.ASCII);
        Console.WriteLine($"Write string to 0x{stringAddress:X}: {(writeSuccess ? "Success" : "Failed")}");
    }

    /// <summary>
    /// Example 1.4: Reading and writing raw bytes
    /// </summary>
    public static void ReadWriteBytes()
    {
        Console.WriteLine("\n=== Example 1.4: Read/Write Bytes ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        IntPtr address = magic.Memory.ImageBase + 0x4000;

        // Read bytes
        byte[] buffer = magic.Memory.ReadBytes(address, 16);
        Console.WriteLine($"Read {buffer.Length} bytes from 0x{address:X}");
        Console.WriteLine($"Hex: {BitConverter.ToString(buffer)}");

        // Write bytes
        byte[] patchBytes = { 0x90, 0x90, 0x90 }; // NOP x3
        int bytesWritten = magic.Memory.WriteBytes(address, patchBytes);
        Console.WriteLine($"Wrote {bytesWritten} bytes to 0x{address:X}");
    }

    /// <summary>
    /// Example 1.5: Using RemotePointer for fluent addressing
    /// </summary>
    public static void RemotePointerUsage()
    {
        Console.WriteLine("\n=== Example 1.5: RemotePointer Fluent Addressing ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        // Create a pointer to module base
        var modulePtr = magic[magic.Memory.ImageBase];

        // Read offsets from module base
        try
        {
            int offset1 = modulePtr.Read<int>(0x1000);
            Console.WriteLine($"Read int at module_base + 0x1000: {offset1}");

            // Chained reads (pointer -> value -> offset)
            IntPtr nestedPtr = modulePtr.Read<IntPtr>(0x2000);
            if (nestedPtr != IntPtr.Zero)
            {
                var nestedPtrObj = magic[nestedPtr];
                int nestedValue = nestedPtrObj.Read<int>(0x50);
                Console.WriteLine($"Read nested pointer value: {nestedValue}");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Note: Read failed (offset may be invalid): {ex.Message}");
        }
    }

    /// <summary>
    /// Example 1.6: Relative addressing
    /// </summary>
    public static void RelativeAddressing()
    {
        Console.WriteLine("\n=== Example 1.6: Relative Addressing ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        IntPtr moduleBase = magic.Memory.ImageBase;

        // Absolute addressing (default)
        int absValue = magic.Memory.Read<int>(moduleBase + 0x1000);
        Console.WriteLine($"Absolute read at 0x{moduleBase + 0x1000:X}: {absValue}");

        // Relative addressing (relative to module base)
        int relValue = magic.Memory.Read<int>(0x1000, isRelative: true);
        Console.WriteLine($"Relative read at offset 0x1000: {relValue}");

        // They should be the same
        Console.WriteLine($"Values match: {absValue == relValue}");
    }

    /// <summary>
    /// Example 1.7: Error handling
    /// </summary>
    public static void ErrorHandling()
    {
        Console.WriteLine("\n=== Example 1.7: Error Handling ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        // Try to read from invalid address
        try
        {
            int invalidRead = magic.Memory.Read<int>(unchecked((IntPtr)0xdeadbeef));
            Console.WriteLine($"Read from invalid address (shouldn't reach here): {invalidRead}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"✓ Caught expected exception: {ex.GetType().Name}");
        }

        // Try to write to read-only memory (will return false)
        bool writeSuccess = magic.Memory.Write(magic.Memory.ImageBase, 42);
        Console.WriteLine($"Write to read-only memory: {(writeSuccess ? "Unexpected success" : "✓ Expected failure")}");

        // Try to read string from invalid address
        string invalidString = magic.Memory.ReadString(unchecked((IntPtr)0xdeadbeef), Encoding.ASCII);
        Console.WriteLine($"Read string from invalid address: \"{invalidString}\" (empty = graceful failure)");
    }

    /// <summary>
    /// Example 1.8: Working with custom structs
    /// </summary>
    public static void CustomStructs()
    {
        Console.WriteLine("\n=== Example 1.8: Custom Structs ===");

        var process = TargetProcess();
        if (process == null) return;

        using var magic = Magic.Open(process);

        IntPtr structAddress = magic.Memory.ImageBase + 0x5000;

        try
        {
            // Read struct
            PlayerInfo player = magic.Memory.Read<PlayerInfo>(structAddress);
            Console.WriteLine($"Read PlayerInfo:");
            Console.WriteLine($"  Health: {player.Health}");
            Console.WriteLine($"  Position: ({player.PositionX}, {player.PositionY})");
            Console.WriteLine($"  Level: {player.Level}");
            Console.WriteLine($"  Experience: {player.Experience}");

            // Write struct
            PlayerInfo updatedPlayer = player with
            {
                Health = 100,
                Level = player.Level + 1
            };
            bool writeSuccess = magic.Memory.Write(structAddress, updatedPlayer);
            Console.WriteLine($"Write updated PlayerInfo: {(writeSuccess ? "Success" : "Failed")}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Note: Struct read/write failed (address may be invalid): {ex.Message}");
        }
    }

    /// <summary>
    /// Run all basic memory operation examples
    /// </summary>
    public static void RunAll()
    {
        Console.WriteLine("╔════════════════════════════════════════════════════════════╗");
        Console.WriteLine("║   WhiteMagic Example 1: Basic Memory Operations          ║");
        Console.WriteLine("╚════════════════════════════════════════════════════════════╝");

        ReadWritePrimitives();
        ReadWriteArrays();
        ReadWriteStrings();
        ReadWriteBytes();
        RemotePointerUsage();
        RelativeAddressing();
        ErrorHandling();
        CustomStructs();

        Console.WriteLine("\n✓ All basic memory operation examples completed!");
    }
}