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import os
import hashlib
import json

# ================================
# CONFIGURATION: Update these values
# ================================

DIRECTORIES = [
    r"C:\Folder1",  # Replace with your first directory path
    r"C:\Folder2"   # Replace with your second directory path
]

BASELINE_FILE = "baseline.json"

# ================================
# FUNCTIONS
# ================================

def calculate_md5(file_path):
    """Calculate and return the MD5 hash of a given file."""
    hash_md5 = hashlib.md5()
    try:
        with open(file_path, "rb") as f:
            for chunk in iter(lambda: f.read(4096), b""):
                hash_md5.update(chunk)
    except Exception as e:
        print(f"Error reading {file_path}: {e}")
        return None
    return hash_md5.hexdigest()

def generate_baseline(directories, baseline_file):
    """Generate a baseline hash dictionary for all files in the specified directories."""
    baseline = {}
    for directory in directories:
        print(f"Scanning directory: {directory}")
        for root, _, files in os.walk(directory):
            for file in files:
                full_path = os.path.join(root, file)
                file_hash = calculate_md5(full_path)
                if file_hash:
                    baseline[full_path] = file_hash

    with open(baseline_file, "w") as bf:
        json.dump(baseline, bf, indent=4)
    print(f"Baseline generated and saved to {baseline_file}")

def check_integrity(directories, baseline_file):
    """Compare current file hashes against the stored baseline and alert on any changes."""
    try:
        with open(baseline_file, "r") as bf:
            baseline = json.load(bf)
    except FileNotFoundError:
        print("Baseline file not found. Generating a new baseline.")
        generate_baseline(directories, baseline_file)
        return

    current_state = {}
    changed_files = []
    new_files = []

    for directory in directories:
        print(f"Scanning directory: {directory}")
        for root, _, files in os.walk(directory):
            for file in files:
                full_path = os.path.join(root, file)
                file_hash = calculate_md5(full_path)
                if file_hash:
                    current_state[full_path] = file_hash
                    if full_path in baseline:
                        if baseline[full_path] != file_hash:
                            changed_files.append(full_path)
                    else:
                        new_files.append(full_path)

    removed_files = [file for file in baseline if file not in current_state]

    if changed_files or new_files or removed_files:
        print("Alert: File integrity changes detected!")
        if changed_files:
            print("\nChanged files:")
            for file in changed_files:
                print(f" - {file}")
        if new_files:
            print("\nNew files:")
            for file in new_files:
                print(f" - {file}")
        if removed_files:
            print("\nRemoved files:")
            for file in removed_files:
                print(f" - {file}")
    else:
        print("No changes detected. File integrity is intact.")

# ================================
# MAIN EXECUTION
# ================================
if __name__ == "__main__":
    # Automatically decide whether to generate a baseline or perform a check
    if not os.path.exists(BASELINE_FILE):
        print("Baseline file does not exist. Creating baseline.")
        generate_baseline(DIRECTORIES, BASELINE_FILE)
    else:
        print("Baseline file found. Checking file integrity.")
        check_integrity(DIRECTORIES, BASELINE_FILE)