/*
macli - Unofficial CLI-Based MyAnimeList Client
Copyright © 2022 Vidhu Kant Sharma <vidhukant@vidhukant.xyz>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

package auth

import (
  "os"
  "fmt"
  "github.com/zalando/go-keyring"
  "github.com/spf13/viper"
)

var refreshPrefix string = "-refresh-token"
var expiresPrefix string = "-expires-in"
var NoSysKeyring bool

func GetToken() string {
  secret, err := keyring.Get(serviceName, userName)
  if err != nil {
    fmt.Println("\x1b[31mError while reading access token from keychain:", err.Error(), "\x1b[0m")
    fmt.Println("Run `macli login` first to authenticate with your MyAnimeList API Token")
    os.Exit(1)
  }

  return secret
}

func setToken(secret string) {
  if NoSysKeyring {
    defer viper.WriteConfig()
    viper.Set("auth.token", secret)
    viper.Set("auth.no_system_keyring", true)
    return
  }

  err := keyring.Set(serviceName, userName, secret)
  if err != nil {
    fmt.Println("Error while writing access token to keychain", err.Error())
    os.Exit(1)
  }
}

func deleteToken() {
  if NoSysKeyring {
    defer viper.WriteConfig()
    viper.Set("auth.token", "")
  }

  err := keyring.Delete(serviceName, userName)
  // if secret doesnt exist dont show error
  if err != nil && !NoSysKeyring {
    if err.Error() != "secret not found in keyring" {
      fmt.Println("Error while deleting authentication token", err.Error())
      os.Exit(1)
    }
  }
}

// currently refreshtoken has no use
func setRefreshToken(secret string) {
  if NoSysKeyring {
    defer viper.WriteConfig()
    viper.Set("auth.refresh", secret)
    return
  }

  err := keyring.Set(serviceName + refreshPrefix, userName, secret)
  if err != nil {
    fmt.Println("Error while writing access token to keychain", err)
    os.Exit(1)
  }
}

func getRefreshToken() string {
  secret, err := keyring.Get(serviceName + refreshPrefix, userName)
  if err != nil {
    fmt.Println("\x1b[31mError while reading refresh token from keychain:", err.Error(), "\x1b[0m")
    fmt.Println("Your access token won't be automatically refreshed. If you have problems using macli please run `macli login` to log in again.")
    os.Exit(1)
  }

  return secret
}

func deleteRefreshToken() {
  if NoSysKeyring {
    defer viper.WriteConfig()
    viper.Set("auth.refresh", "")
  }

  err := keyring.Delete(serviceName + refreshPrefix, userName)
  // if secret doesnt exist dont show error
  if err != nil && !NoSysKeyring {
    if err.Error() != "secret not found in keyring" {
      fmt.Println("Error while deleting refresh token", err.Error())
      os.Exit(1)
    }
  }
}

func setExpiresIn(secret string) {
  if NoSysKeyring {
    defer viper.WriteConfig()
    viper.Set("auth.refresh", secret)
    return
  }

  err := keyring.Set(serviceName + expiresPrefix, userName, secret)
  if err != nil {
    fmt.Println("Error while writing token expire time to keychain", err)
    os.Exit(1)
  }
}

func getExpiresIn() string {
  secret, err := keyring.Get(serviceName + expiresPrefix, userName)
  if err != nil {
    fmt.Println("\x1b[31mError while reading token expire time from keychain:", err.Error(), "\x1b[0m")
    fmt.Println("Please log in again using `macli login` if problems occour")
    // os.Exit(1)
  }

  return secret
}

func deleteExpiresIn() {
  if NoSysKeyring {
    defer viper.WriteConfig()
    viper.Set("auth.refresh", "")
  }

  err := keyring.Delete(serviceName + expiresPrefix, userName)
  // if secret doesnt exist dont show error
  if err != nil && !NoSysKeyring {
    if err.Error() != "secret not found in keyring" {
      fmt.Println("Error while deleting token expires in data", err.Error())
      os.Exit(1)
    }
  }
}