package main

import (
	"fmt"

	"github.com/BurntSushi/toml"
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/endpoints"
)

type Upstream struct {
	Addr    string   `toml:"addr"`
	Program string   `toml:"program"`
	Args    []string `toml:"args"`
}

type OAuthProvider struct {
	Kind         string `toml:"kind"`
	ClientID     string `toml:"client_id"`
	ClientSecret string `toml:"client_secret"`
	RedirectURL  string `toml:"redirect_url"`
}

type Config struct {
	ListenURL     string        `toml:"listen_url"`
	GuardedPaths  []string      `toml:"guarded_paths"`
	AllowedUsers  []string      `toml:"allowed_users"`
	Upstream      Upstream      `toml:"upstream"`
	OAuthProvider OAuthProvider `toml:"provider"`
}

func LoadConfig() (Config, oauth2.Config, error) {
	config := Config{}
	oa2 := oauth2.Config{}
	_, err := toml.DecodeFile("config.toml", &config)
	if err != nil {
		return config, oa2, fmt.Errorf("unable to parse 'config.toml' tompl decoding error: %w", err)
	}

	oa2.ClientID = config.OAuthProvider.ClientID
	oa2.ClientSecret = config.OAuthProvider.ClientSecret
	oa2.Endpoint = oauth2.Endpoint{}
	oa2.RedirectURL = config.OAuthProvider.RedirectURL
	oa2.Scopes = []string{}

	switch config.OAuthProvider.Kind {
	case "github":
		oa2.Endpoint = endpoints.GitHub
		oa2.Scopes = []string{"read:user"}
	case "google":
		oa2.Endpoint = endpoints.Google
		oa2.Scopes = []string{"https://www.googleapis.com/auth/userinfo.email"}
	}

	return config, oa2, err
}