package auth

import (
	"errors"

	"github.com/gin-gonic/gin"

	"chat-switchboard/models"
	"chat-switchboard/store"
)

type Mode string

const (
	ModeBuiltin Mode = "builtin"
	ModeMTLS    Mode = "mtls"
	ModeOIDC    Mode = "oidc"
)

func ParseMode(s string) (Mode, error) {
	switch Mode(s) {
	case ModeBuiltin, "":
		return ModeBuiltin, nil
	case ModeMTLS:
		return ModeMTLS, nil
	case ModeOIDC:
		return ModeOIDC, nil
	default:
		return "", ErrUnsupportedMode
	}
}

type Result struct {
	User      *models.User
	IsNewUser bool
	VaultHint string // password (builtin) or "" (external)
}

type Provider interface {
	Mode() Mode
	Authenticate(c *gin.Context, stores store.Stores) (*Result, error)
	SupportsRegistration() bool
	Register(c *gin.Context, stores store.Stores) (*Result, error)
}

var (
	ErrUnsupportedMode = errors.New("unsupported auth mode")
	ErrNotSupported    = errors.New("operation not supported by this auth provider")
	ErrInvalidCreds    = errors.New("invalid credentials")
	ErrInactive        = errors.New("account is inactive")
	ErrRegistrationOff = errors.New("registration is disabled")
	ErrDuplicate       = errors.New("username or email already taken")
)