package email

import (
	"context"
	"fmt"
	"os"

	"github.com/resend/resend-go/v2"
)

type Service struct {
	client *resend.Client
}

func NewService() *Service {
	apiKey := os.Getenv("RESEND_API_KEY")
	if apiKey == "" {
		panic("RESEND_API_KEY environment variable is required")
	}

	client := resend.NewClient(apiKey)
	return &Service{client: client}
}

func (s *Service) SendVerificationCode(ctx context.Context, email, username, code string) error {
	params := &resend.SendEmailRequest{
		From:    "noreply@termbox.keircn.com",
		To:      []string{email},
		Subject: "Verify your Termbox account",
		Html: fmt.Sprintf(`
			<h2>Welcome to Termbox, %s!</h2>
			<p>Please verify your account with the following code:</p>
			<h1 style="font-family: monospace; letter-spacing: 5px; color: #2563eb;">%s</h1>
			<p>This code will expire in 10 minutes.</p>
			<p>If you didn't create an account, please ignore this email.</p>
		`, username, code),
		Text: fmt.Sprintf(`
Welcome to Termbox, %s!

Please verify your account with the following code: %s

This code will expire in 10 minutes.

If you didn't create an account, please ignore this email.
		`, username, code),
	}

	_, err := s.client.Emails.Send(params)
	return err
}