package auth

type Client struct {
	clientId     string
	clientSecret string
	redirectUri  string

	stateStorage StateStorage
}

func NewClient(clientId string, clientSecret string, redirectUri string) *Client {
	return &Client{
		clientId:     clientId,
		clientSecret: clientSecret,
		redirectUri:  redirectUri,

		stateStorage: NewHttpCookieStateStorage(StateStorageCookie),
	}
}

// GetToken exchanges an authorization code for an access token.
//
// https://dev.twitch.tv/docs/authentication/getting-tokens-oidc/#oidc-authorization-code-grant-flow
func (c *Client) GetToken(code string) (*Token, error) {
	return GetToken(&GetTokenParams{
		ClientId:     c.clientId,
		ClientSecret: c.clientSecret,
		Code:         code,
		GrantType:    "authorization_code",
		RedirectUri:  c.redirectUri,
	})
}

// RefreshToken exchanges a refresh token for an access token.
//
// https://dev.twitch.tv/docs/authentication/refresh-tokens/
func (c *Client) RefreshToken(token *Token) (*Token, error) {
	return GetToken(&GetTokenParams{
		ClientId:     c.clientId,
		ClientSecret: c.clientSecret,
		Code:         token.RefreshToken,
		GrantType:    "refresh_token",
		RedirectUri:  c.redirectUri,
	})
}

// WithStateStorage sets the instance's state storage,
// which is used to store the state parameter between requests.
//
// By default, the http cookie state storage is used.
func (c *Client) WithStateStorage(storage StateStorage) *Client {
	c.stateStorage = storage

	return c
}