#!/usr/bin/env python3

import os
import re
import sys
from pathlib import Path


# DIR="/Volumes/web/files/books/Nancy-McWilliams/psychoanalytic-diagnosis/text"
DIR="./text"
meta_tag=r'<meta name="viewport" content="width=device-width, initial-scale=1.0"/>'
existing_tag=r'<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>'



def insert_viewport_meta(file_path:str):
    """Insert the viewport meta tag if it does not exist."""
    try:
        with open(file_path, 'r', encoding='utf-8') as file:
            content = file.read()
            
        print(f"Read {len(content) / 1024:.2f} kb from {file_path}")
        if meta_tag in content:
            print(f"Tag already exists in {file_path}")
            return
        
        modified_content = re.sub(
            existing_tag,
            f"{existing_tag}\n    {meta_tag}\n",
            content
        )

        with open(file_path, 'w', encoding='utf-8') as file:
            file.write(modified_content)
            
        print(f"Inserted the {meta_tag} in {file_path}")

    except Exception as e:
        print(f"Error processing {file_path}: {e}", file=sys.stderr)
        return


if __name__ == "__main__":
    html_files = list(Path(DIR).glob("**/*.html"))
    print(f"Found {len(html_files)} html files in {DIR}")

    for file in html_files:
        print(f"------------\nTo process: {file}")
        insert_viewport_meta(file)