package util

import (
	"errors"
	"os"
	"strings"

	"github.com/joho/godotenv"
)

func LoadConfig() (*Config, error) {
	config := Config{}
	config.def()

	err := config.loadEnv()
	if err != nil {
		return nil, err
	}
	// other sources?

	config.verify()
	return &config, nil
}

type Config struct {
	ClientID     string
	ClientSecret string
	RedirectURI  string
	SQliteDB     string
	WSAuthorization string
}

func (c *Config) def() {
	c.SQliteDB = "./db.sqlite"
}

func (c *Config) loadEnv() error {
	err := godotenv.Load()
	if err != nil {
		return err
	}

	if str, found := os.LookupEnv("CLIENT_ID"); found {
		c.ClientID = strings.TrimSpace(str)
	}
	if str, found := os.LookupEnv("CLIENT_SECRET"); found {
		c.ClientSecret = strings.TrimSpace(str)
	}
	if str, found := os.LookupEnv("REDIR_URI"); found {
		c.RedirectURI = strings.TrimSpace(str)
	}
	if str, found := os.LookupEnv("SQLITE_DB"); found {
		c.SQliteDB = strings.TrimSpace(str)
	}
	if str, found := os.LookupEnv("WS_AUTHORIZATION"); found {
		c.WSAuthorization = strings.TrimSpace(str)
	}

	return nil
}

func (c *Config) verify() error {
	if c.ClientID == "" {
		return errors.New("unable to load a configured Client ID")
	}
	if c.ClientSecret == "" {
		return errors.New("unable to load a configured Client Secret")
	}
	if c.RedirectURI == "" {
		return errors.New("unable to load a configured Redirect URI")
	}
	if c.WSAuthorization == "" {
		return errors.New("unable to load a configured WS Authorization code")
	}

	return nil
}