// Copyright 2022 Paul Greenberg greenpau@outlook.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package security

import (
	"github.com/caddyserver/caddy/v2"
	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
	"github.com/greenpau/caddy-security/pkg/util"
	"github.com/greenpau/go-authcrunch"
	"github.com/greenpau/go-authcrunch/pkg/errors"
	"github.com/greenpau/go-authcrunch/pkg/messaging"
)

const (
	msgPrefix = "security.messaging"
)

// parseCaddyfileCredentials parses messaging configuration.
//
// Syntax:
//
//   messaging email provider <name> {
//     address <address>
//     protocol smtp
//     credentials <credential_name>
//     sender <email_address> [name]
//     template password_recovery <path>
//     template registration_confirmation <path>
//     template registration_ready <path>
//     template registration_verdict <path>
//     template mfa_otp <path>
//     bcc <email_address_1> <email_address2>
//   }
//
//   messaging file provider <name> {
//     rootdir <path>
//   }
//
func parseCaddyfileMessaging(d *caddyfile.Dispenser, repl *caddy.Replacer, cfg *authcrunch.Config) error {
	args := util.FindReplaceAll(repl, d.RemainingArgs())
	if len(args) != 3 {
		return d.ArgErr()
	}
	if args[1] != "provider" {
		return d.ArgErr()
	}

	switch args[0] {
	case "email":
		c := &messaging.EmailProvider{
			Name: args[2],
		}
		for nesting := d.Nesting(); d.NextBlock(nesting); {
			k := d.Val()
			v := util.FindReplaceAll(repl, d.RemainingArgs())
			switch k {
			case "address":
				c.Address = v[0]
			case "protocol":
				c.Protocol = v[0]
			case "credentials":
				c.Credentials = v[0]
			case "sender":
				c.SenderEmail = v[0]
				if len(v) > 1 {
					c.SenderName = v[1]
				}
			case "template":
				if len(v) != 2 {
					return errors.ErrMalformedDirective.WithArgs([]string{msgPrefix, args[0], k}, v)
				}
				if c.Templates == nil {
					c.Templates = make(map[string]string)
				}
				c.Templates[v[0]] = v[1]
			case "passwordless":
				c.Passwordless = true
			case "bcc":
				for _, r := range v {
					c.BlindCarbonCopy = append(c.BlindCarbonCopy, r)
				}
			default:
				return errors.ErrMalformedDirective.WithArgs([]string{msgPrefix, args[0], k}, v)
			}
		}
		if err := cfg.AddMessagingProvider(c); err != nil {
			return errors.ErrMalformedDirective.WithArgs([]string{msgPrefix, args[0], args[1]}, err)
		}
	case "file":
		p := &messaging.FileProvider{
			Name: args[2],
		}
		for nesting := d.Nesting(); d.NextBlock(nesting); {
			k := d.Val()
			v := util.FindReplaceAll(repl, d.RemainingArgs())
			if len(v) != 1 {
				return errors.ErrMalformedDirective.WithArgs([]string{msgPrefix, args[0], k}, v)
			}
			switch k {
			case "rootdir":
				p.RootDir = v[0]
			default:
				return errors.ErrMalformedDirective.WithArgs([]string{msgPrefix, args[0], k}, v)
			}
		}
		if err := cfg.AddMessagingProvider(p); err != nil {
			return errors.ErrMalformedDirective.WithArgs([]string{msgPrefix, args[0], args[1]}, err)
		}
	default:
		return errors.ErrMalformedDirective.WithArgs(msgPrefix, args)
	}
	return nil
}