#!/usr/bin/env python3
"""
Generate feed-master configuration from channels.yml.
This ensures a single source of truth for the YouTube channels.
"""

import sys
from pathlib import Path

from .channel_config import build_rss_bridge_url, load_channel_entries


def generate_fm_config(channels_file, output_file, rss_bridge_host="rss-bridge"):
    """Generate feed-master YAML configuration from channels.yml"""

    print(f"Reading channels from {channels_file}")
    channels = load_channel_entries(Path(channels_file))
    print(f"Found {len(channels)} channels")

    # Generate feed configuration
    config = []
    config.append("# Feed Master Configuration")
    config.append("# Auto-generated from channels.yml")
    config.append("# Do not edit manually - regenerate using generate_feed_config.py")
    config.append("")
    config.append("feeds:")
    config.append("  youtube-unified:")
    config.append("    title: YouTube Unified Feed")
    config.append("    description: Aggregated feed from all YouTube channels")
    config.append("    link: https://youtube.com")
    config.append('    language: "en-us"')
    config.append("    sources:")

    processed = 0
    skipped = 0

    for channel in channels:
        if not channel.get("rss_enabled", True):
            skipped += 1
            continue
        bridge_url = build_rss_bridge_url(channel, rss_bridge_host=rss_bridge_host)
        if not bridge_url:
            skipped += 1
            continue
        name = channel.get("name", "Unknown")
        config.append(f"      - name: {name}")
        config.append(f"        url: {bridge_url}")
        processed += 1

    # Add system configuration
    config.append("")
    config.append("system:")
    config.append("  update: 5m")
    config.append("  max_per_feed: 5")
    config.append("  max_total: 200")
    config.append("  max_keep: 1000")
    config.append("  base_url: http://localhost:8097")

    # Write output
    print(f"\nProcessed {processed} channels, skipped {skipped}")

    with open(output_file, 'w') as f:
        f.write('\n'.join(config))

    print(f"Configuration written to {output_file}")
    print(f"\nTo apply this configuration:")
    print(f"  1. Copy {output_file} to feed-master/etc/fm.yml")
    print(f"  2. Restart the feed-master service")


if __name__ == "__main__":
    # Default paths
    script_dir = Path(__file__).parent
    channels_file = script_dir / "channels.yml"
    output_file = script_dir / "feed-master-config" / "fm.yml"

    # Allow overriding via command line
    if len(sys.argv) > 1:
        channels_file = Path(sys.argv[1])
    if len(sys.argv) > 2:
        output_file = Path(sys.argv[2])

    if not channels_file.exists():
        print(f"Error: {channels_file} not found", file=sys.stderr)
        print(f"\nUsage: {sys.argv[0]} [channels.yml] [output.yml]", file=sys.stderr)
        sys.exit(1)

    # Ensure output directory exists
    output_file.parent.mkdir(parents=True, exist_ok=True)

    generate_fm_config(channels_file, output_file)