package email

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"

	log "github.com/sirupsen/logrus"

	"github.com/authorizerdev/authorizer/server/constants"
)

const apiURL = "https://api.mailgun.net/v3/%s/messages"

func MailgunRest(to string, data map[string]interface{}, subject string, template string) error {
	var mailgunAPIKey = os.Getenv("MAILGUN_API_KEY")
	var mailgunDomain = os.Getenv("MAILGUN_DOMAIN")

	vars, err := json.Marshal(data)
	if err != nil {
		vars = nil
	}

	// Create payload
	payload := map[string]interface{}{
		"from":                  mailgunDomain + " <noreply@" + mailgunDomain + ">",
		"to":                    to,
		"subject":               subject,
		"template":              template,
		"h:X-Mailgun-Variables": string(vars),
	}

	// Convert payload to JSON
	payloadJSON, err := json.Marshal(payload)
	if err != nil {
		return err
	}

	// Make HTTP POST request
	client := &http.Client{}
	req, err := http.NewRequest("POST", fmt.Sprintf(apiURL, mailgunDomain), bytes.NewBuffer(payloadJSON))
	if err != nil {
		return err
	}

	req.SetBasicAuth("api", mailgunAPIKey)
	req.Header.Set("Content-Type", "application/json")

	resp, err := client.Do(req)
	if err != nil {
		return err
	}

	defer resp.Body.Close()

	// Log the Mailgun API response
	responseBody, err := io.ReadAll(resp.Body)
	if err != nil {
		log.Printf("Error reading Mailgun API response: %v", err)
		return err
	}

	log.Printf("Mailgun API response: %s", responseBody)

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("failed to send email, status: %d", resp.StatusCode)
	}

	return nil
}

// SendMailgun function to send
func SendMailgun(to []string, event string, data map[string]interface{}) error {
	template := "email_confirmation"

	switch event {
	case constants.VerificationTypeBasicAuthSignup:
		template = "email_confirmation_ru"
	case constants.VerificationTypeForgotPassword:
		template = "password_reset"
	case constants.VerificationTypeInviteMember:
		template = "author_invited"
	case constants.VerificationTypeMagicLinkLogin:
		template = "magic_link_login"
	case constants.VerificationTypeOTP:
		template = "one_time_password"
	case constants.VerificationTypeUpdateEmail:
		template = "email_update"
	}

	subject := "Подтверждение почты"

	// TODO: language selection logic here

	err := MailgunRest(to[0], data, subject, template)

	// Log the response
	if err != nil {
		log.Printf("Error sending email: %v", err)
	} else {
		log.Println("Email sent successfully")
	}

	return err
}