"""Notification Blueprint: templates, logs, preferences.

Prefix: /pos/api/notifications
"""

from flask import Blueprint, request, jsonify, g
from middleware import require_auth
from tenant_db import get_tenant_conn
from services.notification_engine import (
    get_templates, create_template, update_template,
    dispatch_notification, get_notification_logs, mark_as_read,
    notify_low_stock, notify_order_ready, notify_maintenance_due,
    notify_new_sale, notify_po_received,
)

notification_bp = Blueprint('notifications', __name__, url_prefix='/pos/api/notifications')


@notification_bp.route('/templates', methods=['GET'])
@require_auth()
def list_templates():
    event_type = request.args.get('event_type')
    channel = request.args.get('channel')
    conn = get_tenant_conn(g.tenant_id)
    try:
        templates = get_templates(conn, g.tenant_id, event_type=event_type, channel=channel)
        return jsonify({'templates': templates})
    finally:
        conn.close()


@notification_bp.route('/templates', methods=['POST'])
@require_auth()
def create_new_template():
    data = request.get_json() or {}
    required = ['event_type', 'channel', 'name', 'body_template']
    for field in required:
        if not data.get(field):
            return jsonify({'error': f'{field} is required'}), 400
    conn = get_tenant_conn(g.tenant_id)
    try:
        tid = create_template(
            conn, g.tenant_id, data['event_type'], data['channel'], data['name'],
            data['body_template'], subject_template=data.get('subject_template'),
            is_active=data.get('is_active', True),
        )
        return jsonify({'id': tid, 'message': 'Template created'}), 201
    finally:
        conn.close()


@notification_bp.route('/templates/<int:template_id>', methods=['PUT'])
@require_auth()
def update_existing_template(template_id):
    data = request.get_json() or {}
    conn = get_tenant_conn(g.tenant_id)
    try:
        ok = update_template(conn, template_id, data)
        if not ok:
            return jsonify({'error': 'No fields to update'}), 400
        return jsonify({'message': 'Template updated'})
    finally:
        conn.close()


@notification_bp.route('/logs', methods=['GET'])
@require_auth()
def list_logs():
    recipient_type = request.args.get('recipient_type')
    recipient_id = request.args.get('recipient_id', type=int)
    status = request.args.get('status')
    limit = min(int(request.args.get('limit', 50)), 200)
    conn = get_tenant_conn(g.tenant_id)
    try:
        logs = get_notification_logs(
            conn, g.tenant_id, recipient_type=recipient_type,
            recipient_id=recipient_id, status=status, limit=limit,
        )
        return jsonify({'logs': logs})
    finally:
        conn.close()


@notification_bp.route('/logs/<int:log_id>/read', methods=['PUT'])
@require_auth()
def mark_log_read(log_id):
    conn = get_tenant_conn(g.tenant_id)
    try:
        mark_as_read(conn, log_id)
        return jsonify({'message': 'Marked as read'})
    finally:
        conn.close()


@notification_bp.route('/dispatch', methods=['POST'])
@require_auth()
def manual_dispatch():
    """Manually dispatch a notification."""
    data = request.get_json() or {}
    event_type = data.get('event_type')
    context = data.get('context', {})
    if not event_type:
        return jsonify({'error': 'event_type is required'}), 400

    conn = get_tenant_conn(g.tenant_id)
    try:
        log_ids = dispatch_notification(
            conn, g.tenant_id, event_type, context,
            recipient_type=data.get('recipient_type', 'owner'),
            recipient_id=data.get('recipient_id'),
            channels=data.get('channels'),
        )
        return jsonify({'log_ids': log_ids, 'message': 'Notification dispatched'})
    finally:
        conn.close()


# ─── Convenience endpoints ─────────────────────────────

@notification_bp.route('/test/low-stock', methods=['POST'])
@require_auth()
def test_low_stock():
    data = request.get_json() or {}
    inventory_id = data.get('inventory_id')
    if not inventory_id:
        return jsonify({'error': 'inventory_id required'}), 400
    conn = get_tenant_conn(g.tenant_id)
    try:
        log_ids = notify_low_stock(
            conn, g.tenant_id, inventory_id,
            stock=data.get('stock', 0),
            reorder_point=data.get('reorder_point', 5),
        )
        return jsonify({'log_ids': log_ids, 'message': 'Low stock notification sent'})
    finally:
        conn.close()