#!/usr/bin/python3

"""
Main module for calling PSEO related functions. This is the end user interface and is user-driven.
Allows the user to specify various parameters for blog generation without needing to edit the code.
"""

import sys
import os
import re
import argparse
import requests
from loguru import logger
import csv
import json

# Logger configuration
logger.remove()
logger.add(sys.stdout, colorize=True, format="<level>{level}</level>|<green>{file}:{line}:{function}</green>| {message}")

# Importing custom functions
from lib.get_text_response import generate_detailed_blog, generate_youtube_blog
from lib.main_youtube_research_blog import generate_youtube_research_blog
from lib.main_keywords_to_blog import generate_keyword_blog


def parse_arguments():
    """Parses command-line arguments.

    Returns:
        argparse.Namespace: Parsed arguments.
    """
    parser = argparse.ArgumentParser(description="Generate blogs based on user input.")
    parser.add_argument("--csv", type=str, help="Provide path csv file. Check the template csv for example.")
    parser.add_argument("--keywords", type=str, help="Keywords for blog generation.")
    parser.add_argument("--niche", action='store_true', default=False, help="Flag to generate niche blogs (default: False).")
    parser.add_argument("--num_subtopics", type=int, default=6, help="Number of subtopics per blog (default: 6).")
    parser.add_argument("--youtube_urls", type=str, help="Comma-separated YouTube URLs for blog generation.")
    parser.add_argument("--wordpress", action='store_true', default=False, help="Flag to upload blogs to WordPress (default: False).")
    parser.add_argument("--output_format", choices=['plaintext', 'markdown', 'html'], default='plaintext', help="Output format of the blogs (default: plaintext).")
    parser.add_argument("--research", action='store_true', default=False, help="Flag to perform online research for given keywords (default: False).")

    return parser.parse_args()


def check_openai_api_key(api_key):
    """Checks if the OpenAI API key is valid.

    Args:
        api_key (str): The OpenAI API key.

    Returns:
        bool: True if the key is valid, False otherwise.
    """
    headers = {"Authorization": f"Bearer {api_key}"}
    response = requests.get("https://api.openai.com/v1/engines", headers=headers)
    return response.status_code == 200


def main():
    """Main function to handle blog generation based on user input."""
    try:
        args = parse_arguments()
        logger.info("Fetch and Validate Openai key.")
        # Validate user input
        if not args.keywords and not args.youtube_urls and not args.csv:
            raise ValueError("Either --keywords or --youtube_urls must be provided.")

        # Validate OpenAI API key
        openai_api_key = os.environ.get("OPENAI_API_KEY")
        if not openai_api_key or not check_openai_api_key(openai_api_key):
            raise EnvironmentError("Invalid or missing OPENAI_API_KEY environment variable.")

        logger.info("Valid OpenAI API key found.")

        # Handle blog generation based on input
        if args.youtube_urls:
            yt_urls = args.youtube_urls.split(",")
            valid_urls = [url for url in yt_urls if is_valid_url(url)]
            quoted_strings = [url for url in yt_urls if not is_valid_url(url)]

            if valid_urls:
                logger.info(f"Generating blogs from YouTube URLs: {valid_urls}")
                generate_youtube_blog(valid_urls)
            if quoted_strings:
                logger.info(f"Do youtube research and write blogs for: {quoted_strings}")
                generate_youtube_research_blog(quoted_strings)

        elif args.keywords:
            logger.info(f"Generating {args.num_blogs} blogs on '{args.keywords}' with {args.num_subtopics} subtopics.")
            #generate_detailed_blog(args.num_blogs, args.keywords, args.niche,
            #        args.num_subtopics, args.wordpress, args.output_format)
            keyword_list = args.keywords.split(",")
            generate_keyword_blog(keyword_list)

        elif args.csv:
            try:
                data = read_csv_to_json(args.csv)
                logger.info(f"Generating blogs from csv file: {json.dumps(data, indent=4)}")
                for item in data:
                    keyword_list = [item['keyword']]
                    generate_keyword_blog(keyword_list, item['URL'])
            except Exception as err:
                logger.error(f"Failed to generate blogs the CSV file:{err}")
                sys.exit(1)
            
    except Exception as e:
        logger.error(f"An error occurred: {e}")
        sys.exit(1)


def read_csv_to_json(file_path):
    # Initialize a list to store JSON objects
    json_data = []

    try:
        # Read the CSV file
        with open(file_path, newline='', encoding='utf-8') as csvfile:
            reader = csv.DictReader(csvfile)

            # Iterate over each row and convert it to a JSON object
            for row in reader:
                json_data.append(row)

        return json_data
    except Exception as err:
        logger.error(f"Failed to read the CSV file:{err}")
        sys.exit(1)


def is_valid_url(url):
    """
    Check if the given string is a valid URL.

    Args:
        url (str): String to check.

    Returns:
        bool: True if the string is a valid URL, False otherwise.
    """
    # Regular expression to check for a valid URL
    url_pattern = re.compile(     
        r'^(?:http|ftp)s?://'  # http:// or https://
        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|'  # domain...
        r'localhost|'  # localhost...
        r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|'  # ...or ipv4
        r'\[?[A-F0-9]*:[A-F0-9:]+\]?)'  # ...or ipv6
        r'(?::\d+)?'  # optional port
        r'(?:/?|[/?]\S+)$', re.IGNORECASE)

    return re.match(url_pattern, url) is not None


if __name__ == "__main__":
    main()