// Copyright 2018 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package models

import (
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/util"

	"github.com/tstranex/u2f"
)

// U2FRegistration represents the registration data and counter of a security key
type U2FRegistration struct {
	ID          int64 `xorm:"pk autoincr"`
	Name        string
	UserID      int64 `xorm:"INDEX"`
	Raw         []byte
	Counter     uint32
	CreatedUnix util.TimeStamp `xorm:"INDEX created"`
	UpdatedUnix util.TimeStamp `xorm:"INDEX updated"`
}

// TableName returns a better table name for U2FRegistration
func (reg U2FRegistration) TableName() string {
	return "u2f_registration"
}

// Parse will convert the db entry U2FRegistration to an u2f.Registration struct
func (reg *U2FRegistration) Parse() (*u2f.Registration, error) {
	r := new(u2f.Registration)
	return r, r.UnmarshalBinary(reg.Raw)
}

func (reg *U2FRegistration) updateCounter(e Engine) error {
	_, err := e.ID(reg.ID).Cols("counter").Update(reg)
	return err
}

// UpdateCounter will update the database value of counter
func (reg *U2FRegistration) UpdateCounter() error {
	return reg.updateCounter(x)
}

// U2FRegistrationList is a list of *U2FRegistration
type U2FRegistrationList []*U2FRegistration

// ToRegistrations will convert all U2FRegistrations to u2f.Registrations
func (list U2FRegistrationList) ToRegistrations() []u2f.Registration {
	regs := make([]u2f.Registration, len(list))
	for _, reg := range list {
		r, err := reg.Parse()
		if err != nil {
			log.Fatal(4, "parsing u2f registration: %v", err)
			continue
		}
		regs = append(regs, *r)
	}

	return regs
}

func getU2FRegistrationsByUID(e Engine, uid int64) (U2FRegistrationList, error) {
	regs := make(U2FRegistrationList, 0)
	return regs, e.Where("user_id = ?", uid).Find(&regs)
}

// GetU2FRegistrationByID returns U2F registration by id
func GetU2FRegistrationByID(id int64) (*U2FRegistration, error) {
	return getU2FRegistrationByID(x, id)
}

func getU2FRegistrationByID(e Engine, id int64) (*U2FRegistration, error) {
	reg := new(U2FRegistration)
	if found, err := e.ID(id).Get(reg); err != nil {
		return nil, err
	} else if !found {
		return nil, ErrU2FRegistrationNotExist{ID: id}
	}
	return reg, nil
}

// GetU2FRegistrationsByUID returns all U2F registrations of the given user
func GetU2FRegistrationsByUID(uid int64) (U2FRegistrationList, error) {
	return getU2FRegistrationsByUID(x, uid)
}

func createRegistration(e Engine, user *User, name string, reg *u2f.Registration) (*U2FRegistration, error) {
	raw, err := reg.MarshalBinary()
	if err != nil {
		return nil, err
	}
	r := &U2FRegistration{
		UserID:  user.ID,
		Name:    name,
		Counter: 0,
		Raw:     raw,
	}
	_, err = e.InsertOne(r)
	if err != nil {
		return nil, err
	}
	return r, nil
}

// CreateRegistration will create a new U2FRegistration from the given Registration
func CreateRegistration(user *User, name string, reg *u2f.Registration) (*U2FRegistration, error) {
	return createRegistration(x, user, name, reg)
}

// DeleteRegistration will delete U2FRegistration
func DeleteRegistration(reg *U2FRegistration) error {
	return deleteRegistration(x, reg)
}

func deleteRegistration(e Engine, reg *U2FRegistration) error {
	_, err := e.Delete(reg)
	return err
}
