package service

import (
	"context"
	"fmt"
	"strings"

	emailpkg "carrot_bbs/internal/pkg/email"
)

// SendEmailRequest 发信请求
type SendEmailRequest struct {
	To          []string
	Cc          []string
	Bcc         []string
	ReplyTo     []string
	Subject     string
	TextBody    string
	HTMLBody    string
	Attachments []string
}

type EmailService interface {
	IsEnabled() bool
	Send(ctx context.Context, req SendEmailRequest) error
	SendText(ctx context.Context, to []string, subject, body string) error
	SendHTML(ctx context.Context, to []string, subject, html string) error
}

type emailServiceImpl struct {
	client emailpkg.Client
}

func NewEmailService(client emailpkg.Client) EmailService {
	return &emailServiceImpl{client: client}
}

func (s *emailServiceImpl) IsEnabled() bool {
	return s.client != nil && s.client.IsEnabled()
}

func (s *emailServiceImpl) Send(ctx context.Context, req SendEmailRequest) error {
	if s.client == nil {
		return fmt.Errorf("email client is nil")
	}
	if !s.client.IsEnabled() {
		return fmt.Errorf("email service is disabled")
	}
	if len(req.To) == 0 {
		return fmt.Errorf("email recipient is empty")
	}
	if strings.TrimSpace(req.Subject) == "" {
		return fmt.Errorf("email subject is empty")
	}

	return s.client.Send(ctx, emailpkg.Message{
		To:          req.To,
		Cc:          req.Cc,
		Bcc:         req.Bcc,
		ReplyTo:     req.ReplyTo,
		Subject:     req.Subject,
		TextBody:    req.TextBody,
		HTMLBody:    req.HTMLBody,
		Attachments: req.Attachments,
	})
}

func (s *emailServiceImpl) SendText(ctx context.Context, to []string, subject, body string) error {
	return s.Send(ctx, SendEmailRequest{
		To:       to,
		Subject:  subject,
		TextBody: body,
	})
}

func (s *emailServiceImpl) SendHTML(ctx context.Context, to []string, subject, html string) error {
	return s.Send(ctx, SendEmailRequest{
		To:       to,
		Subject:  subject,
		HTMLBody: html,
	})
}