"""
DES Talk - A Proxmark3 DESFire Communication Tool

Copyright (C) 2025 Trigat

Description:
This script simplifies the creation and deletion of
DESFire applications and files. It supports USB, Bluetooth,
and Termux connections and has been tested on Android and Linux.

Note: Modify TCP_PORT below if using TCP app with Android or Termux

License: GNU General Public License v3.0

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

Full license text: <https://www.gnu.org/licenses/gpl-3.0.html>
"""


import subprocess
import time
import os
import re

try:
    import pm3  # Used when inside the pm3 environment
    PM3_AVAILABLE = True
    p = pm3.pm3()
except ImportError:
    PM3_AVAILABLE = False  # Use subprocess instead

# SPECIFY PORT IF USING TCP APP WITH ANDROID OR TERMUX
TCP_PORT = 4444

def detect_proxmark_device():

    # Detect the Proxmark3 connection type (USB, Bluetooth, or TCP).
    try:
        # Try running `pm3 --list` to detect available Proxmark devices
        result = subprocess.run(["pm3", "--list"], capture_output=True, text=True, check=True)
        lines = result.stdout.splitlines()

        for line in lines:
            if ":" in line:  # Expected format: "1: /dev/ttyACM0" or "1: bt:xx:xx:xx:xx:xx"
                device = line.split(": ", 1)[1].strip()
                print(f"✅ Using Proxmark device: {device}")
                return device
    except Exception:
        print("⚠️ `pm3 --list` failed, falling back to manual detection.")

    # If `pm3 --list` doesn't work, check manually (Android or fallback mode)
    usb_devices = ["/dev/ttyACM0", "/dev/ttyACM1", "/dev/ttyUSB0", "/dev/ttyUSB1"]
    for dev in usb_devices:
        if os.path.exists(dev):
            print(f"✅ Using USB device: {dev}")
            return dev

    # Default to TCP mode for Android Termux
    print(f"⚠️ No USB or Bluetooth device found, defaulting to TCP (localhost:{TCP_PORT})")
    return f"tcp:localhost:{TCP_PORT}"

def send_proxmark_command(command):

    if PM3_AVAILABLE:
        p.console(command)
        return p.grabbed_output.strip()

    else:
        full_command = f"{command}\n"
        host_device = detect_proxmark_device()

        process = subprocess.Popen(
            ["proxmark3", host_device],
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True
        )

        output, error = process.communicate(full_command)

        time.sleep(0.2)  # Small delay to let Proxmark process fully

        # Combine stdout and stderr
        response_lines = (output or "").splitlines() + (error or "").splitlines()

        # Remove the harmless "STDIN unexpected end" message
        filtered_response = "\n".join(line for line in response_lines if "STDIN unexpected end" not in line)

        return filtered_response.strip()

def authenticate_and_menu():

    key_type = input("Enter key type (DES, 2TDEA, 3TDEA, AES): ").strip()
    key = input("Enter 8, 16, 24 or 32-byte hex key (no spaces): ").strip()

    # Authenticate
    auth_command = f"hf mfdes auth -t {key_type} -k {key}"
    auth_response = send_proxmark_command(auth_command)
    print(auth_response)

    # Check for Proxmark failure messages
    if "error" in auth_response.lower() or "must have" in auth_response.lower():
        print("❌ Authentication failed. Check your connection, key, and key type.")
        return

    while True:

        # Get AIDs
        aids_command = f"hf mfdes getaids -n 0 -t {key_type} -k {key}"
        aids_response = send_proxmark_command(aids_command)
        print(aids_response)

        # Regex to match valid 6-character hex AIDs
        hex_pattern = re.compile(r"\b[0-9A-Fa-f]{6}\b")

        aids = []
        for line in aids_response.split("\n"):
            if "PM3 UART serial baudrate" in line:
                continue
            match = hex_pattern.search(line)
            if match:
                aids.append(match.group(0))

        if aids:  # Check if there are any AIDs
            print("\nAvailable AIDs:")
            for i, aid in enumerate(aids):
                print(f"{i + 1}. {aid}")
        else:
            print("\n❌ No AID found on the card.")

        print("\nChoose an option:")
        print("1. Select an AID")
        print("2. Create a new AID")
        print("3. Delete an AID")
        print("4. Format PICC")
        print("5. Show free memory")
        print("6. Exit")

        choice = input("Enter your choice: ").strip()

        if choice == "1":
            selected_index = int(input("Select an available AID number (e.g., 1, 2, or 3): ")) - 1
            if selected_index < 0 or selected_index >= len(aids):
                print("\nInvalid selection.")
                continue

            selected_aid = aids[selected_index]
            print(f"\nSelecting AID: {selected_aid}")

            select_command = f"hf mfdes selectapp --aid {selected_aid} -t {key_type} -k {key}"
            select_response = send_proxmark_command(select_command)
            print(select_response)

            # Show file menu
            aid_file_menu(selected_aid, key_type, key)

        elif choice == "2":
            create_aid(key_type, key)

        elif choice == "3":
            delete_aid(key_type, key)

        elif choice == "4":
            format_picc(key_type, key)

        elif choice == "5":
            free_memory(key_type, key)

        elif choice == "6":
            print("Exiting...")
            break
        else:
            print("Invalid choice, please try again.")

def aid_file_menu(selected_aid, key_type, key):

    while True:
        print(f"\n[ AID {selected_aid} is open ]")
        print("\nChoose an operation:")
        print("1. List Files")
        print("2. Read a File")
        print("3. Create a File")
        print("4. Write to a File")
        print("5. Delete a File")
        print("6. Exit")

        choice = input("Enter your choice: ").strip()

        if choice == "1":
            list_files(selected_aid, key_type, key)
        elif choice == "2":
            read_file(selected_aid, key_type, key)
        elif choice == "3":
            create_file(selected_aid, key_type, key)
        elif choice == "4":
            write_to_file(selected_aid, key_type, key)
        elif choice == "5":
            delete_file(selected_aid, key_type, key)
        elif choice == "6":
            print("Returning to AID selection...")
            break
        else:
            print("Invalid choice, please try again.")

def create_aid(key_type, key):

    aid = input("Enter new AID (6 hex characters, e.g., 112233): ").strip()
    iso_fid = input("Enter ISO File ID (4 hex characters, e.g., 1234): ").strip()
    dstalgo = input("Enter encryption algorithm (DES, 2TDEA, 3TDEA, AES): ").strip().upper()

    create_command = f"hf mfdes createapp -n 0 --aid {aid} --fid {iso_fid} --dstalgo {dstalgo} -t {key_type} -k {key} -a"
    response = send_proxmark_command(create_command)
    print(response)

def delete_aid(key_type, key):

    aid = input("Enter AID to delete (6 hex characters): ").strip()
    delete_command = f"hf mfdes deleteapp --aid {aid} -n 0 -t {key_type} -k {key}"
    response = send_proxmark_command(delete_command)
    print(response)

def format_picc(key_type, key):

    confirm = input("Are you sure you want to format the PICC? This will erase all data. (y/n): ").strip().lower()

    if confirm == "y":
        format_command = f"hf mfdes formatpicc -t {key_type} -k {key} -v"
        response = send_proxmark_command(format_command)
        print(response)
    elif confirm == "n":
        print("Formatting cancelled.")
    else:
        print("Invalid input. Please enter 'y' or 'n'.")

def free_memory(key_type, key):

    memory_command = f"hf mfdes freemem -t {key_type} -k {key}"
    response = send_proxmark_command(memory_command)

    for line in response.splitlines():
        if "Free memory" in line:
            print(f"\n✅ {line}")
            return

    print("❌ Unable to retrieve free memory information.")

def list_files(aid, key_type, key):

    print("\nFetching file list...")
    command = f"hf mfdes getfileids --aid {aid} -t {key_type} -k {key}"
    response = send_proxmark_command(command)

    # Extract file IDs by looking for "File ID:" regex
    file_ids = []
    for line in response.splitlines():
        match = re.search(r"File ID:\s*([0-9A-Fa-f]{2})", line)
        if match:
            file_ids.append(match.group(1))

    if file_ids:
        print("\nAvailable File IDs:")
        for i, file_id in enumerate(file_ids, 1):
            print(f"{i}. {file_id}")
        return file_ids
    else:
        print("No files found in this AID.")
        return []

def read_file(aid, key_type, key):

    file_id = input("Enter file ID to read: ").strip()

    # Get offset and ensure it's a 3-byte hex value (default: 000000)
    offset_input = input("Enter offset (default 0): ").strip() or "0"
    offset_hex = format(int(offset_input), '06X')  # Convert to 3-byte hex

    # Get length and ensure it's a 3-byte hex value (default: 000000 for full read)
    length_input = input("Enter length to read (e.g., 16 for 16 bytes, 64 for 64 bytes, default full read): ").strip() or "0"
    length_hex = format(int(length_input), '06X')  # Convert to 3-byte hex

    read_command = f"hf mfdes read --aid {aid} --fid {file_id} -t {key_type} -k {key} --offset {offset_hex} --length {length_hex}"
    response = send_proxmark_command(read_command)

    # Extract and display file content
    print("\nFile Data:")
    for line in response.splitlines():
        if re.search(r"\| [0-9A-Fa-f]{2} .* \|", line):  # Matches data table format
            print(line)

    return response

def create_file(aid, key_type, key):

    # Prompt for file ID in hex format
    file_id = input("Enter file ID (2 hex characters, e.g., 01, 02): ").strip()
    # Prompt for file size in KB, allowing for decimal values like 0.2KB
    file_size_kb_input = input("Enter file size in KB (e.g., .2 for 0.2KB, 1 for 1KB, 4 for 4KB, 16 for 16KB): ").strip()
    # Prefixes "00" to file_id for ISO file ID
    iso_file_id = f"00{file_id}"

    try:
        # Convert the input to a float
        file_size_kb = float(file_size_kb_input)

        if file_size_kb <= 0:
            raise ValueError("File size must be greater than 0.")

        # Convert KB to bytes (1 KB = 1024 bytes)
        file_size_bytes = int(file_size_kb * 1024)

        if file_size_bytes < 3:
            print("⚠️ File size is too small. Setting to minimum size of 3 bytes.")
            file_size_bytes = 3

        # Convert bytes to hexadecimal
        file_size_hex = format(file_size_bytes, 'X').upper().zfill(6)

        print(f"File size in bytes: {file_size_bytes} bytes")
        print(f"File size in hex: {file_size_hex}")

    except ValueError as e:
        print(f"Invalid file size: {e}")
        return

    create_command = f"hf mfdes createfile --aid {aid} --fid {file_id} --isofid {iso_file_id} --size {file_size_hex} -t {key_type} -k {key}"
    response = send_proxmark_command(create_command)
    print(response)

def write_to_file(aid, key_type, key):

    file_id = input("Enter file ID to write to: ").strip()

    # Get file size
    file_size_command = f"hf mfdes getfilesettings --aid {aid} --fid {file_id} -t {key_type} -k {key}"
    response = send_proxmark_command(file_size_command)

    # Extract the file size from the response
    file_size_match = re.search(r"File size \(bytes\)... (\d+) / 0x([0-9A-Fa-f]+)", response)
    if not file_size_match:
        print("❌ Unable to determine file size.")
        return

    file_size = int(file_size_match.group(1))  # Decimal file size

    print(f"✅ File size detected: {file_size} bytes")

    # Prompt user for data format choice (plain text or hex)
    while True:
        data_format = input("Enter data format (Type 1 for plain text, 2 for hex): ").strip()

        if data_format == "1":
            # Text input (no hex)
            write_data = input(f"Enter text to write (up to {file_size} bytes, no need for hex): ").strip()
            write_data_hex = write_data.encode().hex().upper()  # Convert to hex
            break

        elif data_format == "2":
            # Hex input
            write_data_hex = input(f"Enter hex data to write (up to {file_size * 2} hex chars): ").strip()
            if len(write_data_hex) % 2 != 0:  # Ensure it's a valid hex string
                print("❌ Invalid hex input. Please enter an even number of characters.")
            elif len(write_data_hex) // 2 > file_size:
                print(f"❌ Data exceeds file size limit of {file_size} bytes. Try again.")
            else:
                break
        else:
            print("❌ Invalid choice. Please choose 1 for text or 2 for hex.")

    write_command = f"hf mfdes write --aid {aid} --fid {file_id} -t {key_type} -k {key} -d {write_data_hex}"
    response = send_proxmark_command(write_command)
    print(response)

def delete_file(aid, key_type, key):

    file_id = input("Enter file ID to delete: ").strip()

    delete_command = f"hf mfdes deletefile --aid {aid} --fid {file_id} -t {key_type} -k {key}"
    response = send_proxmark_command(delete_command)
    print(response)

if __name__ == "__main__":
    authenticate_and_menu()