package model

import (
	"encoding/json"
	"fmt"
)

type APIError struct {
	Error            string `json:"error"`
	ErrorDescription string `json:"error_description,omitempty"`
}

// Predefined errors
var (
	APIErrorUnknownIssuer  = APIError{ErrorInvalidRequest, "The provided issuer is not supported"}
	APIErrorStateMismatch  = APIError{ErrorInvalidRequest, "State mismatched"}
	APIErrorNoRefreshToken = APIError{ErrorOIDC, "Did not receive a refresh token"}
)

// Predefined OAuth2/OIDC errors
const (
	ErrorInvalidRequest       = "invalid_request"
	ErrorInvalidClient        = "invalid_client"
	ErrorInvalidGrant         = "invalid_grant"
	ErrorUnauthorizedClient   = "unauthorized_client"
	ErrorUnsupportedGrantType = "unsupported_grant_type"
	ErrorInvalidScope         = "invalid_scope"
	ErrorInvalidToken         = "invalid_token"
	ErrorInsufficientScope    = "insufficient_scope"
)

// Additional Mytoken errors
const (
	ErrorInternal = "internal_server_error"
	ErrorOIDC     = "oidc_error"
)

func InternalServerError(errorDescription string) APIError {
	return APIError{
		Error:            ErrorInternal,
		ErrorDescription: errorDescription,
	}
}

func OIDCError(oidcError, oidcErrorDescription string) APIError {
	error := oidcError
	if oidcErrorDescription != "" {
		error = fmt.Sprintf("%s: %s", oidcError, oidcErrorDescription)
	}
	return APIError{
		Error:            ErrorOIDC,
		ErrorDescription: error,
	}
}

func OIDCErrorFromBody(body []byte) (error APIError, ok bool) {
	bodyError := APIError{}
	if err := json.Unmarshal(body, &bodyError); err != nil {
		return
	}
	error = OIDCError(bodyError.Error, bodyError.ErrorDescription)
	ok = true
	return
}