package oauth

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"net/url"
	"os"
	"strings"
)

var (
	clientID = os.Getenv("TWITCH_CLIENT_ID")
	clientSecret = os.Getenv("TWITCH_CLIENT_SECRET")
	redirectURI = "http://localhost:8080/callback"

	scopes = []string{
		"chat:read",
		"chat:edit",
		"channel:read:subscriptions",
		"user:read:email",
	}
)

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	RefreshToken string `json:"refresh_token"`
	ExpiresIn int `json:"expires_in"`
	Scope []string `json:"scope"`
	TokenType string `json:"token_type"`
}

// start http server for oauth login & callback
func StartOAuthServer(addr string) error {
	if clientID == "" || clientSecret == "" {
		return fmt.Errorf("TWITCH_CLIENT_ID and TWITCH_CLIENT_SECRET must be set")
	}

	http.HandleFunc("/", handleIndex)
	http.HandleFunc("/callback", handleCallback)

	log.Printf("OAuth server listening on %s", addr)
	return http.ListenAndServe(addr, nil)
}