"""
Alerts API blueprint.

Handles endpoints for viewing alert history and managing alert rules.
"""

from flask import Blueprint, jsonify, request

bp = Blueprint('alerts', __name__)


@bp.route('', methods=['GET'])
def list_alerts():
    """
    List recent alerts.

    Query params:
        page: Page number (default: 1)
        per_page: Items per page (default: 20)
        alert_type: Filter by alert type
        severity: Filter by severity (info, warning, critical)
        start_date: Filter alerts after this date
        end_date: Filter alerts before this date

    Returns:
        JSON response with alerts list
    """
    # TODO: Implement in Phase 4
    return jsonify({
        'alerts': [],
        'total': 0,
        'page': 1,
        'per_page': 20,
        'message': 'Alerts list endpoint - to be implemented in Phase 4'
    })


@bp.route('/rules', methods=['GET'])
def list_alert_rules():
    """
    List all alert rules.

    Returns:
        JSON response with alert rules
    """
    # TODO: Implement in Phase 4
    return jsonify({
        'rules': [],
        'message': 'Alert rules list endpoint - to be implemented in Phase 4'
    })


@bp.route('/rules', methods=['POST'])
def create_alert_rule():
    """
    Create a new alert rule.

    Request body:
        rule_type: Type of alert rule
        threshold: Threshold value (e.g., days for cert expiry)
        enabled: Whether rule is active (default: true)
        email_enabled: Send email for this rule (default: false)

    Returns:
        JSON response with created rule ID
    """
    # TODO: Implement in Phase 4
    data = request.get_json() or {}

    return jsonify({
        'rule_id': None,
        'status': 'not_implemented',
        'message': 'Alert rule creation endpoint - to be implemented in Phase 4',
        'data': data
    }), 501


@bp.route('/rules/<int:rule_id>', methods=['PUT'])
def update_alert_rule(rule_id):
    """
    Update an existing alert rule.

    Args:
        rule_id: Alert rule ID to update

    Request body:
        threshold: Threshold value (optional)
        enabled: Whether rule is active (optional)
        email_enabled: Send email for this rule (optional)

    Returns:
        JSON response with update status
    """
    # TODO: Implement in Phase 4
    data = request.get_json() or {}

    return jsonify({
        'rule_id': rule_id,
        'status': 'not_implemented',
        'message': 'Alert rule update endpoint - to be implemented in Phase 4',
        'data': data
    }), 501


@bp.route('/rules/<int:rule_id>', methods=['DELETE'])
def delete_alert_rule(rule_id):
    """
    Delete an alert rule.

    Args:
        rule_id: Alert rule ID to delete

    Returns:
        JSON response with deletion status
    """
    # TODO: Implement in Phase 4
    return jsonify({
        'rule_id': rule_id,
        'status': 'not_implemented',
        'message': 'Alert rule deletion endpoint - to be implemented in Phase 4'
    }), 501


# Health check endpoint
@bp.route('/health', methods=['GET'])
def health_check():
    """
    Health check endpoint for monitoring.

    Returns:
        JSON response with API health status
    """
    return jsonify({
        'status': 'healthy',
        'api': 'alerts',
        'version': '1.0.0-phase1'
    })