import tkinter as tk
from tkinter import filedialog, messagebox
import re

def process_file():
    root = tk.Tk()
    root.withdraw()
    
    file_path = filedialog.askopenfilename(
        title="Select a file to process",
        filetypes=[("Text files", "*.txt"), ("HTML files", "*.htm *.html"), ("All files", "*.*")]
    )
    
    if not file_path:
        print("No file selected")
        return
    
    # Read the file
    with open(file_path, 'r', encoding='utf-8') as f:
        content = f.read()
    
    # Simple regex approach - only add p tags to text not already in tags
    # This preserves existing tags exactly as they are
    
    # Split by lines and process
    lines = content.split('\n')
    result_lines = []
    in_tag = False
    
    for line in lines:
        # Check if line has any HTML tags
        if re.search(r'<[^>]+>', line):
            # Line has tags, keep as is
            result_lines.append(line)
            in_tag = True
        else:
            # Plain text line
            if line.strip():
                result_lines.append(f'<p>{line.strip()}</p>')
            else:
                result_lines.append('')
    
    result = '\n'.join(result_lines)
    
    # Ask for confirmation to overwrite
    if not messagebox.askyesno("Confirm Overwrite", f"This will overwrite:\n{file_path}\n\nContinue?"):
        print("Operation cancelled")
        return
    
    # Overwrite the source file
    with open(file_path, 'w', encoding='utf-8') as f:
        f.write(result)
    
    print(f"✅ File overwritten: {file_path}")

if __name__ == "__main__":
    process_file()