package web

import (
	"context"
	"errors"
	"strconv"
	"time"
)

const AccountSessionsPerPage = 20

const BrowserLogoutPath = "/logout/browser"

var ErrAccountNotFound = errors.New("web: no such session of this user")

type AccountProblem int

const (
	AccountPasswordWrong AccountProblem = iota + 1
	AccountPasswordShort
	AccountPasswordLong
	AccountBusy
	AccountDisplayNameInvalid
	AccountPasswordChanged
)

var accountProblemNames = map[AccountProblem]string{
	AccountPasswordWrong:      "the current password is not correct",
	AccountPasswordShort:      "the new password is too short",
	AccountPasswordLong:       "the new password is too long",
	AccountBusy:               "the password check is busy",
	AccountDisplayNameInvalid: "the display name is not valid",
	AccountPasswordChanged:    "the password was changed in the meantime",
}

func (p AccountProblem) Error() string {
	if s, ok := accountProblemNames[p]; ok {
		return "web: account: " + s
	}
	return "web: unknown account problem " + strconv.Itoa(int(p))
}

type AccountProfile struct {
	Username, DisplayName string
	Groups                []string
	GroupCount            int
	Primary               string
	AdminURL              string
	Google, Portdistrict  bool
	GoogleLink            *AccountGoogleLink
	SSHKeys               []SSHKey
}

type AccountSession struct {
	ID, Host                 string
	Created, Expires         time.Time
	ThisSession, ThisBrowser bool
	ClientID, Address        string
	UserAgent                string
	LastSeen                 time.Time
}

type AccountSessions struct {
	Sessions []AccountSession
	Total    int
}

type AccountBackend interface {
	Profile(ctx context.Context, p Principal) (AccountProfile, error)
	ChangePassword(ctx context.Context, p Principal, current, next string) error
	Sessions(ctx context.Context, p Principal, page int) (AccountSessions, error)
	RevokeSession(ctx context.Context, p Principal, id string) error
	RevokeOtherSessions(ctx context.Context, p Principal) (int, error)
	SignOutBrowser(ctx context.Context, p Principal) (int, error)
	UpdateDisplayName(ctx context.Context, p Principal, name string) error
	SSHKeys(ctx context.Context, p Principal) ([]SSHKey, error)
	AddSSHKey(ctx context.Context, p Principal, key, label string) (SSHKey, error)
	RemoveSSHKey(ctx context.Context, p Principal, keyID string) (SSHKey, error)
}