#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
fetch_osm_fr_groups.py

This script scrapes the OpenStreetMap wiki page for France/OSM-FR to extract
information about local working groups. It specifically targets links in the
#Pages_des_groupes_locaux section.

Usage:
    python fetch_osm_fr_groups.py [--dry-run] [--force]

Options:
    --dry-run    Run the script without saving the results to a file
    --force      Force update even if the cache is still fresh (less than 1 hour old)

Output:
    - osm_fr_groups.json: JSON file with information about OSM-FR local groups
    - Log messages about the scraping process and results
"""

import json
import argparse
import logging
import os
from datetime import datetime, timedelta
import requests
from bs4 import BeautifulSoup

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S'
)
logger = logging.getLogger(__name__)

# Constants
OUTPUT_FILE = "osm_fr_groups.json"
BASE_URL = "https://wiki.openstreetmap.org/wiki/France/OSM-FR"
WIKI_BASE_URL = "https://wiki.openstreetmap.org"
CACHE_DURATION = timedelta(hours=1)  # Cache duration of 1 hour

def is_cache_fresh():
    """
    Check if the cache file exists and is less than CACHE_DURATION old
    
    Returns:
        bool: True if cache is fresh, False otherwise
    """
    if not os.path.exists(OUTPUT_FILE):
        return False
    
    try:
        with open(OUTPUT_FILE, 'r', encoding='utf-8') as f:
            data = json.load(f)
            last_updated = datetime.fromisoformat(data.get('last_updated', '2000-01-01T00:00:00'))
            now = datetime.now()
            return (now - last_updated) < CACHE_DURATION
    except (IOError, json.JSONDecodeError, ValueError) as e:
        logger.error(f"Error checking cache freshness: {e}")
        return False

def get_page_content(url):
    """
    Get the HTML content of a page
    
    Args:
        url (str): URL to fetch
        
    Returns:
        str: HTML content of the page or None if request failed
    """
    try:
        response = requests.get(url)
        response.raise_for_status()
        return response.text
    except requests.exceptions.RequestException as e:
        logger.error(f"Error fetching {url}: {e}")
        return None

def extract_working_groups(html_content):
    """
    Extract working groups from the wiki page HTML
    
    Args:
        html_content (str): HTML content of the wiki page
        
    Returns:
        list: List of working group dictionaries
    """
    if not html_content:
        return []
    
    soup = BeautifulSoup(html_content, 'html.parser')
    working_groups = []
    
    # Find the working groups section
    working_groups_section = None
    for heading in soup.find_all(['h2', 'h3']):
        if heading.get_text().strip() == 'Groupes de travail' or 'Groupes_de_travail' in heading.get_text():
            working_groups_section = heading
            break
    
    if not working_groups_section:
        logger.warning("Could not find working groups section")
        # Return an empty list but with a default category
        return []
    
    # Get the content following the heading until the next heading
    current = working_groups_section.next_sibling
    while current and not current.name in ['h2', 'h3']:
        if current.name == 'ul':
            # Process list items
            for li in current.find_all('li', recursive=False):
                link = li.find('a')
                if link:
                    name = link.get_text().strip()
                    url = WIKI_BASE_URL + link.get('href') if link.get('href').startswith('/') else link.get('href')
                    
                    # Extract description (text after the link)
                    description = ""
                    next_node = link.next_sibling
                    while next_node:
                        if isinstance(next_node, str):
                            description += next_node.strip()
                        next_node = next_node.next_sibling if hasattr(next_node, 'next_sibling') else None
                    
                    description = description.strip(' :-,')
                    
                    working_groups.append({
                        "name": name,
                        "url": url,
                        "description": description,
                        "category": "Général",
                        "type": "working_group"
                    })
        current = current.next_sibling
    
    logger.info(f"Found {len(working_groups)} working groups")
    return working_groups

def extract_local_groups(html_content):
    """
    Extract local groups from the wiki page HTML
    
    Args:
        html_content (str): HTML content of the wiki page
        
    Returns:
        list: List of local group dictionaries
    """
    if not html_content:
        return []
    
    soup = BeautifulSoup(html_content, 'html.parser')
    local_groups = []
    
    # Find the local groups section
    local_groups_section = None
    for heading in soup.find_all(['h2', 'h3']):
        if heading.get_text().strip() == 'Groupes locaux' or 'Pages des groupes locaux' in heading.get_text():
            local_groups_section = heading
            break
    
    if not local_groups_section:
        logger.warning("Could not find local groups section")
        return []
    
    # Get the content following the heading until the next heading
    current = local_groups_section.next_sibling
    while current and not current.name in ['h2', 'h3']:
        if current.name == 'ul':
            # Process list items
            for li in current.find_all('li', recursive=False):
                link = li.find('a')
                if link:
                    name = link.get_text().strip()
                    url = WIKI_BASE_URL + link.get('href') if link.get('href').startswith('/') else link.get('href')
                    
                    # Extract description (text after the link)
                    description = ""
                    next_node = link.next_sibling
                    while next_node:
                        if isinstance(next_node, str):
                            description += next_node.strip()
                        next_node = next_node.next_sibling if hasattr(next_node, 'next_sibling') else None
                    
                    description = description.strip(' :-,')
                    
                    local_groups.append({
                        "name": name,
                        "url": url,
                        "description": description,
                        "type": "local_group"
                    })
        current = current.next_sibling
    
    logger.info(f"Found {len(local_groups)} local groups")
    return local_groups

def extract_umap_url(html_content):
    """
    Extract the uMap URL for OSM-FR local groups
    
    Args:
        html_content (str): HTML content of the wiki page
        
    Returns:
        str: uMap URL or None if not found
    """
    if not html_content:
        return None
    
    soup = BeautifulSoup(html_content, 'html.parser')
    
    # Look for links to umap.openstreetmap.fr
    for link in soup.find_all('a'):
        href = link.get('href', '')
        if 'umap.openstreetmap.fr' in href and 'groupes-locaux' in href:
            return href
    
    return None

def save_results(local_groups, working_groups, umap_url, dry_run=False):
    """
    Save the results to a JSON file
    
    Args:
        local_groups (list): List of local group dictionaries
        working_groups (list): List of working group dictionaries
        umap_url (str): URL to the uMap for local groups
        dry_run (bool): If True, don't actually save to file
        
    Returns:
        bool: True if saving was successful or dry run, False otherwise
    """
    if dry_run:
        logger.info("DRY RUN: Would have saved results to file")
        logger.info(f"Local groups: {len(local_groups)}")
        for group in local_groups:
            logger.info(f"  - {group['name']}: {group['url']}")
        logger.info(f"Working groups: {len(working_groups)}")
        for group in working_groups:
            logger.info(f"  - {group['name']}: {group['url']}")
        if umap_url:
            logger.info(f"uMap URL: {umap_url}")
        return True
    
    # Prepare the data structure
    data = {
        "last_updated": datetime.now().isoformat(),
        "local_groups": local_groups,
        "working_groups": working_groups,
        "umap_url": umap_url
    }
    
    try:
        with open(OUTPUT_FILE, 'w', encoding='utf-8') as f:
            json.dump(data, f, indent=2, ensure_ascii=False)
        logger.info(f"Successfully saved {len(local_groups)} local groups and {len(working_groups)} working groups to {OUTPUT_FILE}")
        return True
    except IOError as e:
        logger.error(f"Error saving results to {OUTPUT_FILE}: {e}")
        return False

def main():
    """Main function to execute the script"""
    parser = argparse.ArgumentParser(description="Scrape OSM-FR local groups from the wiki")
    parser.add_argument("--dry-run", action="store_true", help="Run without saving results to file")
    parser.add_argument("--force", action="store_true", help="Force update even if cache is fresh")
    args = parser.parse_args()
    
    logger.info("Starting fetch_osm_fr_groups.py")
    
    # Check if cache is fresh
    if is_cache_fresh() and not args.force:
        logger.info(f"Cache is still fresh (less than {CACHE_DURATION.total_seconds()/3600} hours old)")
        logger.info(f"Use --force to update anyway")
        return
    
    # Get the wiki page content
    html_content = get_page_content(BASE_URL)
    
    if not html_content:
        logger.error("Failed to get wiki page content")
        return
    
    # Extract local groups
    local_groups = extract_local_groups(html_content)
    
    if not local_groups:
        logger.warning("No local groups found")
    
    # Extract working groups
    working_groups = extract_working_groups(html_content)
    
    if not working_groups:
        logger.warning("No working groups found")
        # Initialize with an empty list to avoid errors in the controller
        working_groups = []
    
    # Extract uMap URL
    umap_url = extract_umap_url(html_content)
    
    # Save results
    success = save_results(local_groups, working_groups, umap_url, args.dry_run)
    
    if success:
        logger.info("Script completed successfully")
    else:
        logger.error("Script completed with errors")

if __name__ == "__main__":
    main()