"""
telegram.py — Telegram bot helper za reels-app.

Pošilja obvestila o končanih jobih, batch summary, napakah.
Credentials se preberejo iz env vars (TELEGRAM_TOKEN, TELEGRAM_CHAT_ID).
"""
import os
import urllib.request
import urllib.parse
import json


def send_message(text, parse_mode="Markdown", disable_notification=False):
    """Pošlji sporočilo na Telegram. Vrne True ob uspehu, False ob napaki.
    
    text: ne sme biti daljši od 4096 znakov.
    parse_mode: 'Markdown' ali 'HTML' ali None.
    disable_notification: True za tiho obvestilo (brez zvonca).
    """
    token = os.environ.get("TELEGRAM_TOKEN")
    chat_id = os.environ.get("TELEGRAM_CHAT_ID")
    if not token or not chat_id:
        return False
    
    # Telegram limit: 4096 chars
    if len(text) > 4090:
        text = text[:4087] + "..."
    
    data_dict = {
        "chat_id": chat_id,
        "text": text,
    }
    if parse_mode:
        data_dict["parse_mode"] = parse_mode
    if disable_notification:
        data_dict["disable_notification"] = "true"
    
    data = urllib.parse.urlencode(data_dict).encode()
    req = urllib.request.Request(
        f"https://api.telegram.org/bot{token}/sendMessage",
        data=data,
        method="POST",
    )
    try:
        with urllib.request.urlopen(req, timeout=10) as resp:
            result = json.loads(resp.read().decode())
            return result.get("ok", False)
    except Exception as e:
        print(f"⚠️ Telegram send failed: {e}", flush=True)
        return False


def notify_job_done(job, base_url="https://reels.biba.live"):
    """Obvesti o končanem reelu."""
    artist = job.get("parsed_artist", "")
    title = job.get("parsed_title", "")
    job_id = job.get("id", "")
    
    if artist and title:
        name = f"*{artist} — {title}*"
    elif title:
        name = f"*{title}*"
    else:
        name = f"`{job_id}`"
    
    duration = job.get("duration", 0)
    output_size_mb = job.get("output_size_mb") or round((job.get("output_size", 0) / 1024 / 1024), 1)
    
    text = (
        f"✅ Reel pripravljen\n\n"
        f"{name}\n"
        f"⏱ {duration:.0f}s · 📦 {output_size_mb} MB\n\n"
        f"[Predogled & Download]({base_url})"
    )
    return send_message(text)


def notify_job_failed(job, error_msg=""):
    """Obvesti o neuspehu joba."""
    artist = job.get("parsed_artist", "")
    title = job.get("parsed_title", "")
    fname = job.get("filename", "")
    
    if artist and title:
        name = f"*{artist} — {title}*"
    elif fname:
        name = f"`{fname}`"
    else:
        name = f"`{job.get('id', '?')}`"
    
    err_short = (error_msg or "neznana napaka")[:200]
    text = f"⚠️ Reel ni uspel\n\n{name}\n\n```\n{err_short}\n```"
    return send_message(text)


def notify_batch_complete(batch_id, total, succeeded, failed, base_url="https://reels.biba.live"):
    """Obvesti o končanem batch-u (več jobov hkrati)."""
    if total <= 1:
        return False  # ne pošiljaj batch summary za en sam job
    
    if failed == 0:
        emoji = "🎉"
        head = f"Batch končan: vsi {total} reelov pripravljeni"
    else:
        emoji = "✅"
        head = f"Batch končan: {succeeded}/{total} uspelih"
        if failed > 0:
            head += f", {failed} neuspelih"
    
    text = f"{emoji} {head}\n\n[Vsi reels →]({base_url})"
    return send_message(text)


def notify_batch_started(batch_id, total):
    """Obvesti o začetku batch-a (samo če > 1 job)."""
    if total <= 1:
        return False
    text = f"🎬 Batch za {total} datotek dodan v vrsto…"
    return send_message(text, disable_notification=True)