#!/usr/bin/env python3
"""
Send Portal Message
====================

Send a message through the NordaBiznes conversation system using the application layer.
Creates conversation if needed (with 1:1 dedup), sends message, triggers email notification.

Usage:
    DATABASE_URL=... python3 scripts/send_portal_message.py \
        --from-user-id 1 \
        --to-user-id 38 \
        --message "Treść wiadomości"

    # Or with HTML content from file:
    DATABASE_URL=... python3 scripts/send_portal_message.py \
        --from-user-id 1 \
        --to-user-id 38 \
        --message-file message.html
"""

import os
import sys
import argparse
from datetime import datetime

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from database import (
    SessionLocal, User, Conversation, ConversationMember, ConvMessage,
)


def find_or_create_conversation(db, from_user_id, to_user_id):
    """Find existing 1:1 conversation or create a new one."""
    # Look for existing 1:1 conversation between these two users
    from_convs = db.query(ConversationMember.conversation_id).filter_by(user_id=from_user_id).subquery()
    to_convs = db.query(ConversationMember.conversation_id).filter_by(user_id=to_user_id).subquery()

    existing = db.query(Conversation).filter(
        Conversation.id.in_(db.query(from_convs.c.conversation_id)),
        Conversation.id.in_(db.query(to_convs.c.conversation_id)),
        Conversation.is_group == False,
    ).first()

    if existing:
        print(f"  Existing conversation found: ID {existing.id}")
        return existing

    # Create new conversation
    conv = Conversation(
        is_group=False,
        owner_id=from_user_id,
        created_at=datetime.now(),
        updated_at=datetime.now(),
    )
    db.add(conv)
    db.flush()

    db.add(ConversationMember(
        conversation_id=conv.id,
        user_id=from_user_id,
        role='owner',
        joined_at=datetime.now(),
    ))
    db.add(ConversationMember(
        conversation_id=conv.id,
        user_id=to_user_id,
        role='member',
        joined_at=datetime.now(),
    ))
    db.flush()

    print(f"  New conversation created: ID {conv.id}")
    return conv


def send_message(db, conv, sender_id, content):
    """Send a message in a conversation."""
    msg = ConvMessage(
        conversation_id=conv.id,
        sender_id=sender_id,
        content=content,
        created_at=datetime.now(),
    )
    db.add(msg)
    db.flush()

    conv.last_message_id = msg.id
    conv.updated_at = msg.created_at

    print(f"  Message sent: ID {msg.id}, {len(content)} chars")
    return msg


def send_email_notification(db, sender, recipient, conv, msg):
    """Send email notification to recipient."""
    try:
        from email_service import send_email, build_message_notification_email
        import re

        if not recipient.email:
            print(f"  Email: skipped (no email for {recipient.name})")
            return

        # Check if user has email notifications enabled
        if hasattr(recipient, 'notify_email_messages') and recipient.notify_email_messages == False:
            print(f"  Email: skipped (notifications disabled for {recipient.name})")
            return

        sender_name = sender.name or sender.email.split('@')[0]
        preview = re.sub(r'<[^>]+>', '', msg.content or '').strip()[:200]
        subject_line = f'Nowa wiadomość od {sender_name} — Norda Biznes'

        # Build URL
        message_url = f'https://nordabiznes.pl/wiadomosci?conv={conv.id}'
        settings_url = 'https://nordabiznes.pl/konto/prywatnosc'

        email_html, email_text = build_message_notification_email(
            sender_name=sender_name,
            subject='Nowa wiadomość',
            content_preview=preview,
            message_url=message_url,
            settings_url=settings_url,
        )

        send_email(
            to=[recipient.email],
            subject=subject_line,
            body_text=email_text,
            body_html=email_html,
            email_type='message_notification',
            user_id=recipient.id,
            recipient_name=recipient.name,
        )
        print(f"  Email: sent to {recipient.email}")

    except Exception as e:
        print(f"  Email: failed ({e})")


def main():
    parser = argparse.ArgumentParser(description='Send portal message')
    parser.add_argument('--from-user-id', type=int, required=True, help='Sender user ID')
    parser.add_argument('--to-user-id', type=int, required=True, help='Recipient user ID')
    parser.add_argument('--message', type=str, help='Message content (HTML)')
    parser.add_argument('--message-file', type=str, help='File with message content (HTML)')
    parser.add_argument('--no-email', action='store_true', help='Skip email notification')
    parser.add_argument('--dry-run', action='store_true', help='Show what would be done')
    args = parser.parse_args()

    if not args.message and not args.message_file:
        parser.error('Provide --message or --message-file')

    content = args.message
    if args.message_file:
        with open(args.message_file) as f:
            content = f.read()

    db = SessionLocal()
    try:
        sender = db.query(User).get(args.from_user_id)
        recipient = db.query(User).get(args.to_user_id)

        if not sender:
            print(f"ERROR: Sender user ID {args.from_user_id} not found")
            sys.exit(1)
        if not recipient:
            print(f"ERROR: Recipient user ID {args.to_user_id} not found")
            sys.exit(1)

        print(f"From: {sender.name} ({sender.email})")
        print(f"To:   {recipient.name} ({recipient.email})")
        print(f"Message: {len(content)} chars")

        if args.dry_run:
            print("\n=== DRY RUN — no changes made ===")
            return

        conv = find_or_create_conversation(db, args.from_user_id, args.to_user_id)
        msg = send_message(db, conv, args.from_user_id, content)
        db.commit()

        if not args.no_email:
            send_email_notification(db, sender, recipient, conv, msg)

        print(f"\nDone. Conversation ID: {conv.id}, Message ID: {msg.id}")

    except Exception as e:
        db.rollback()
        print(f"ERROR: {e}")
        sys.exit(1)
    finally:
        db.close()


if __name__ == '__main__':
    main()