#!/usr/bin/env python3
"""
t-youtube Telegram Digest Cron
Sprint 003 AC T3.2 — Daily summary of today's videos by channel
Run daily at 09:00 UTC+8 via Hermes cron
"""

import os
import json
import sys
import urllib.request
import urllib.error
from datetime import datetime, timezone, timedelta

# --- Config ---
BASE_URL = os.environ.get("TY_API_URL", "http://127.0.0.1:8080")
TELEGRAM_BOT_TOKEN = os.environ.get("TELEGRAM_BOT_TOKEN", "")
TELEGRAM_CHAT_ID = os.environ.get("TELEGRAM_CHAT_ID", "")

# --- Fetch today's videos ---

def fetch_videos():
    today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
    url = f"{BASE_URL}/api/videos?since={today}"
    try:
        req = urllib.request.Request(url)
        with urllib.request.urlopen(req, timeout=15) as resp:
            data = json.loads(resp.read().decode())
            return data.get("videos", data.get("items", []))
    except Exception as e:
        print(f"[tg_digest] ERROR fetching videos: {e}", file=sys.stderr)
        return []

# --- Build digest ---

def build_digest(videos):
    if not videos:
        return "📭 No new videos today."

    # Group by channel
    channels = {}
    for v in videos:
        ch = v.get("channel", v.get("channel_name", "Unknown"))
        channels.setdefault(ch, []).append(v)

    lines = ["📺 **YouTube Digest — Today's Videos**", "", f"_{datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M UTC')}_", ""]

    for ch, items in sorted(channels.items()):
        lines.append(f"### {ch}")
        lines.append(f"_{len(items)} video(s)_")
        lines.append("")
        for v in items:
            title = v.get("title", "Untitled")
            url = v.get("url", v.get("watch_url", ""))
            duration = v.get("duration", "?")
            lines.append(f"- **{title}** ({duration})")
            if url:
                lines.append(f"  {url}")
        lines.append("")

    lines.append("---")
    lines.append(f"Total: {len(videos)} videos from {len(channels)} channels")
    return "\n".join(lines)

# --- Send to Telegram ---

def send_telegram(text):
    if not TELEGRAM_BOT_TOKEN or not TELEGRAM_CHAT_ID:
        print("[tg_digest] WARNING: TELEGRAM_BOT_TOKEN or TELEGRAM_CHAT_ID not set — skipping send")
        print("[tg_digest] Digest would be:\n")
        print(text)
        return False

    url = f"https://api.telegram.org/bot{TELEGRAM_BOT_TOKEN}/sendMessage"
    body = json.dumps({
        "chat_id": TELEGRAM_CHAT_ID,
        "text": text,
        "parse_mode": "Markdown",
        "disable_web_page_preview": False,
    }).encode()

    try:
        req = urllib.request.Request(url, data=body, headers={"Content-Type": "application/json"})
        with urllib.request.urlopen(req, timeout=15) as resp:
            result = json.loads(resp.read().decode())
            if result.get("ok"):
                print(f"[tg_digest] Sent digest to Telegram chat {TELEGRAM_CHAT_ID}")
                return True
            else:
                print(f"[tg_digest] Telegram API error: {result}", file=sys.stderr)
                return False
    except Exception as e:
        print(f"[tg_digest] ERROR sending Telegram: {e}", file=sys.stderr)
        return False

# --- Main ---

def main():
    videos = fetch_videos()
    digest = build_digest(videos)
    print(digest)
    print("")
    send_telegram(digest)

if __name__ == "__main__":
    main()