package email

import (
	"fmt"
	"net/smtp"

	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/config"
)

type Mailer struct {
	cfg config.SMTPConfig
}

func NewMailer(cfg config.SMTPConfig) *Mailer {
	return &Mailer{cfg: cfg}
}

func (m *Mailer) Send(to, subject, body string) error {
	if m.cfg.Host == "" || m.cfg.Port == "" {
		return fmt.Errorf("SMTP is not configured")
	}

	auth := smtp.PlainAuth("", m.cfg.Username, m.cfg.Password, m.cfg.Host)

	msg := []byte("To: " + to + "\r\n" +
		"Subject: " + subject + "\r\n" +
		"Content-Type: text/html; charset=UTF-8\r\n" +
		"\r\n" +
		body + "\r\n")

	addr := m.cfg.Host + ":" + m.cfg.Port

	// Some servers (like STARTTLS on 587) require standard Dial, then StartTLS
	// We'll use smtp.SendMail which does STARTTLS automatically if the server supports it
	err := smtp.SendMail(addr, auth, m.cfg.Username, []string{to}, msg)
	if err != nil {
		// If standard SendMail fails due to TLS issues, fallback to manual TLS/STARTTLS if needed
		// But smtp.SendMail is usually sufficient for standard STARTTLS on port 587.
		return fmt.Errorf("failed to send email: %w", err)
	}

	return nil
}

func (m *Mailer) SendVerificationEmail(to, username, token, appURL string) error {
	subject := "Verify your dumpsterChat email"
	link := fmt.Sprintf("%s/verify-email?token=%s", appURL, token)
	body := fmt.Sprintf(`
		<h1>Welcome to dumpsterChat, %s!</h1>
		<p>Please verify your email address by clicking the link below:</p>
		<p><a href="%s">%s</a></p>
		<p>If you did not sign up for this account, you can safely ignore this email.</p>
	`, username, link, link)

	return m.Send(to, subject, body)
}

func (m *Mailer) SendPasswordResetEmail(to, username, token, appURL string) error {
	subject := "Reset your dumpsterChat password"
	link := fmt.Sprintf("%s/reset-password?token=%s", appURL, token)
	body := fmt.Sprintf(`
		<h1>Password Reset Request</h1>
		<p>Hi %s,</p>
		<p>We received a request to reset your password. Click the link below to set a new password:</p>
		<p><a href="%s">%s</a></p>
		<p>If you did not request this, please ignore this email.</p>
	`, username, link, link)

	return m.Send(to, subject, body)
}

func (m *Mailer) SendAnnouncement(to, subject, body string) error {
	return m.Send(to, subject, body)
}