package mail

import (
	"context"

	"github.com/aws/aws-sdk-go-v2/aws"
	awsconfig "github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/sesv2"
	sesv2types "github.com/aws/aws-sdk-go-v2/service/sesv2/types"
)

// EmailSender is the one SESv2 call the console makes to send as itself
// (its invite fallback), narrowed so tests use a fake. Apps never use it:
// they send by SMTP with their own credential.
type EmailSender interface {
	SendEmail(context.Context, *sesv2.SendEmailInput, ...func(*sesv2.Options)) (*sesv2.SendEmailOutput, error)
}

// NewSESEmailSender builds a sender on the default credential chain, which
// on a box is the host role.
func NewSESEmailSender(ctx context.Context, region string) (EmailSender, error) {
	cfg, err := awsconfig.LoadDefaultConfig(ctx, awsconfig.WithRegion(region))
	if err != nil {
		return nil, err
	}
	return sesv2.NewFromConfig(cfg), nil
}

// SimpleEmailInput is a plain-text message attributed to tenant and, when
// set, counted through configSet.
func SimpleEmailInput(from, to, subject, body, tenant, configSet string) *sesv2.SendEmailInput {
	in := &sesv2.SendEmailInput{
		FromEmailAddress: aws.String(from),
		Destination:      &sesv2types.Destination{ToAddresses: []string{to}},
		Content: &sesv2types.EmailContent{Simple: &sesv2types.Message{
			Subject: &sesv2types.Content{Data: aws.String(subject), Charset: aws.String("UTF-8")},
			Body:    &sesv2types.Body{Text: &sesv2types.Content{Data: aws.String(body), Charset: aws.String("UTF-8")}},
		}},
		TenantName: aws.String(tenant),
	}
	if configSet != "" {
		in.ConfigurationSetName = aws.String(configSet)
	}
	return in
}