package util

import (
	"encoding/json"
	"fmt"

	"github.com/99designs/keyring"
	"github.com/Infisical/infisical-merge/packages/models"
	"github.com/go-resty/resty/v2"
	log "github.com/sirupsen/logrus"
)

const SERVICE_NAME = "infisical"

type LoggedInUserDetails struct {
	IsUserLoggedIn  bool
	LoginExpired    bool
	UserCredentials models.UserCredentials
}

// To do: what happens if the user doesn't have a keyring in their system?
func StoreUserCredsInKeyRing(userCred *models.UserCredentials) error {
	userCredMarshalled, err := json.Marshal(userCred)
	if err != nil {
		return fmt.Errorf("StoreUserCredsInKeyRing: something went wrong when marshalling user creds [err=%s]", err)
	}

	// Get keyring
	configuredKeyring, err := GetKeyRing()
	if err != nil {
		return fmt.Errorf("StoreUserCredsInKeyRing: unable to get keyring instance with [err=%s]", err)
	}

	err = configuredKeyring.Set(keyring.Item{
		Key:  userCred.Email,
		Data: []byte(string(userCredMarshalled)),
	})

	if err != nil {
		return fmt.Errorf("StoreUserCredsInKeyRing: unable to store user credentials because [err=%s]", err)
	}

	return err
}

func GetUserCredsFromKeyRing(userEmail string) (credentials models.UserCredentials, err error) {
	// Get keyring
	configuredKeyring, err := GetKeyRing()
	if err != nil {
		return models.UserCredentials{}, fmt.Errorf("GetUserCredsFromKeyRing: unable to get keyring instance with [err=%s]", err)
	}

	credentialsValue, err := configuredKeyring.Get(userEmail)
	if err != nil {
		return models.UserCredentials{}, fmt.Errorf("GetUserCredsFromKeyRing: unable to get key from Keyring. could not find login credentials in your Keyring. This is common if you have switched vault backend recently. If so, please login in again and retry [err=%s]", err)
	}

	var userCredentials models.UserCredentials

	err = json.Unmarshal([]byte(credentialsValue.Data), &userCredentials)
	if err != nil {
		return models.UserCredentials{}, fmt.Errorf("getUserCredsFromKeyRing: Something went wrong when unmarshalling user creds [err=%s]", err)
	}

	if err != nil {
		return models.UserCredentials{}, fmt.Errorf("GetUserCredsFromKeyRing: Unable to store user credentials [err=%s]", err)
	}

	return userCredentials, err
}

func IsUserLoggedIn() (hasUserLoggedIn bool, theUsersEmail string, err error) {
	if ConfigFileExists() {
		configFile, err := GetConfigFile()
		if err != nil {
			return false, "", fmt.Errorf("IsUserLoggedIn: unable to get logged in user from config file [err=%s]", err)
		}

		if configFile.LoggedInUserEmail == "" {
			return false, "", nil
		}

		userCreds, err := GetUserCredsFromKeyRing(configFile.LoggedInUserEmail)
		if err != nil {
			return false, "", err
		}

		// check to to see if the JWT is still valid
		httpClient := resty.New().
			SetAuthToken(userCreds.JTWToken).
			SetHeader("Accept", "application/json")

		response, err := httpClient.
			R().
			Post(fmt.Sprintf("%v/v1/auth/checkAuth", INFISICAL_URL))

		if err != nil {
			return false, "", err
		}

		if response.StatusCode() > 299 {
			log.Infoln("Login expired, please login again.")
			return false, "", fmt.Errorf("GetUserCredsFromKeyRing: Login expired, please login again.")
		}

		return true, configFile.LoggedInUserEmail, nil
	} else {
		return false, "", nil
	}
}

func GetCurrentLoggedInUserDetails() (LoggedInUserDetails, error) {
	if ConfigFileExists() {
		configFile, err := GetConfigFile()
		if err != nil {
			return LoggedInUserDetails{}, fmt.Errorf("getCurrentLoggedInUserDetails: unable to get logged in user from config file [err=%s]", err)
		}

		if configFile.LoggedInUserEmail == "" {
			return LoggedInUserDetails{}, nil
		}

		userCreds, err := GetUserCredsFromKeyRing(configFile.LoggedInUserEmail)
		if err != nil {
			return LoggedInUserDetails{}, fmt.Errorf("getCurrentLoggedInUserDetails: unable to your credentials from Keyring [err=%s]", err)
		}

		// check to to see if the JWT is still valid
		httpClient := resty.New().
			SetAuthToken(userCreds.JTWToken).
			SetHeader("Accept", "application/json")

		response, err := httpClient.
			R().
			Post(fmt.Sprintf("%v/v1/auth/checkAuth", INFISICAL_URL))

		if err != nil {
			return LoggedInUserDetails{}, err
		}

		if response.StatusCode() > 299 {
			return LoggedInUserDetails{
				IsUserLoggedIn:  true,
				LoginExpired:    true,
				UserCredentials: userCreds,
			}, nil
		}

		return LoggedInUserDetails{
			IsUserLoggedIn:  true,
			LoginExpired:    false,
			UserCredentials: userCreds,
		}, nil
	} else {
		return LoggedInUserDetails{}, nil
	}
}