package model

import (
	"encoding/json"
	"time"
)

// Changeset statuses.
const (
	ChangesetOpen      = "open"
	ChangesetApplied   = "applied"
	ChangesetDiscarded = "discarded"
)

// Op is one operation in a changeset, for example "record.create".
type Op struct {
	Seq  int    `json:"seq"`
	Kind string `json:"op"`
	// ID is the object the operation acts on. For create operations it is
	// allocated when the operation is added, so later operations in the
	// same changeset can refer to the new object.
	ID int64 `json:"id,omitempty"`
	// BaseVersion is the version of the object when the operation was
	// staged. Applying fails with a conflict if the object has changed
	// since (0 skips the check).
	BaseVersion int             `json:"base_version,omitempty"`
	Data        json.RawMessage `json:"data,omitempty"`
	Summary     string          `json:"summary,omitempty"`
	AddedAt     time.Time       `json:"added_at"`
}

// Changeset is a group of operations applied together.
type Changeset struct {
	ID          int64           `json:"id"`
	Description string          `json:"description"`
	Status      string          `json:"status"`
	UserID      int64           `json:"user_id"`
	Username    string          `json:"username"`
	Via         string          `json:"via"` // web, api, cli, import, system
	Ops         []Op            `json:"ops"`
	CreatedAt   time.Time       `json:"created_at"`
	UpdatedAt   time.Time       `json:"updated_at"`
	AppliedAt   *time.Time      `json:"applied_at,omitempty"`
	AppliedBy   string          `json:"applied_by,omitempty"`
	Result      json.RawMessage `json:"result,omitempty"`
	Diff        string          `json:"diff,omitempty"`
}

// Grant gives access to a kind of resource. Filters narrow it: empty
// filters match everything.
type Grant struct {
	Resource string   `json:"resource"` // zones, records, views, acls, tsig, options, audit, *
	Access   string   `json:"access"`   // read or write (write implies read)
	Zones    []string `json:"zones,omitempty"`
	Views    []string `json:"views,omitempty"`
	Names    []string `json:"names,omitempty"`
	Types    []string `json:"types,omitempty"`
}

// User is a person or service account.
type User struct {
	ID           int64      `json:"id"`
	Username     string     `json:"username"`
	PasswordHash string     `json:"-"`
	HasPassword  bool       `json:"has_password"`
	Admin        bool       `json:"admin"`
	Grants       []Grant    `json:"grants"`
	Disabled     bool       `json:"disabled"`
	Comment      string     `json:"comment"`
	CreatedAt    time.Time  `json:"created_at"`
	UpdatedAt    time.Time  `json:"updated_at"`
	LastLoginAt  *time.Time `json:"last_login_at,omitempty"`
}

// Token is an API key. The secret is shown once at creation and only its
// hash is stored.
type Token struct {
	ID         int64  `json:"id"`
	UserID     int64  `json:"user_id"`
	Username   string `json:"username,omitempty"`
	Name       string `json:"name"`
	PublicID   string `json:"public_id"`
	SecretHash string `json:"-"`
	// Grants restrict the token to a subset of its user's permissions;
	// nil means the token has all of the user's permissions.
	Grants     []Grant    `json:"grants"`
	ExpiresAt  *time.Time `json:"expires_at,omitempty"`
	CreatedAt  time.Time  `json:"created_at"`
	LastUsedAt *time.Time `json:"last_used_at,omitempty"`
	LastUsedIP string     `json:"last_used_ip,omitempty"`
	RevokedAt  *time.Time `json:"revoked_at,omitempty"`
	// RotatedAt is when the token last got a new secret (nil: never).
	RotatedAt *time.Time `json:"rotated_at,omitempty"`
	// After a rotation with a grace period, the previous secret keeps
	// working until PrevExpiresAt.
	PrevSecretHash string     `json:"-"`
	PrevExpiresAt  *time.Time `json:"previous_secret_valid_until,omitempty"`
}

// IssuedAt is when the token's current secret was made.
func (t *Token) IssuedAt() time.Time {
	if t.RotatedAt != nil {
		return *t.RotatedAt
	}
	return t.CreatedAt
}

// Session is a logged-in web session.
type Session struct {
	IDHash     string    `json:"-"`
	UserID     int64     `json:"user_id"`
	CSRFToken  string    `json:"-"`
	CreatedAt  time.Time `json:"created_at"`
	ExpiresAt  time.Time `json:"expires_at"`
	LastSeenAt time.Time `json:"last_seen_at"`
	IP         string    `json:"ip"`
	UserAgent  string    `json:"user_agent"`
}

// AuditEvent records an action.
type AuditEvent struct {
	ID          int64           `json:"id"`
	Time        time.Time       `json:"time"`
	UserID      int64           `json:"user_id,omitempty"`
	Username    string          `json:"username,omitempty"`
	Auth        string          `json:"auth,omitempty"` // session, token, local
	TokenID     int64           `json:"token_id,omitempty"`
	TokenName   string          `json:"token_name,omitempty"`
	IP          string          `json:"ip,omitempty"`
	UserAgent   string          `json:"user_agent,omitempty"`
	Action      string          `json:"action"`
	ObjectType  string          `json:"object_type,omitempty"`
	ObjectID    int64           `json:"object_id,omitempty"`
	ObjectName  string          `json:"object_name,omitempty"`
	ChangesetID int64           `json:"changeset_id,omitempty"`
	Outcome     string          `json:"outcome"` // success, failure, denied
	Message     string          `json:"message,omitempty"`
	Details     json.RawMessage `json:"details,omitempty"`
}

// DeployedFile records a file Jarl wrote, for drift detection.
type DeployedFile struct {
	Path        string    `json:"path"`
	SHA256      string    `json:"sha256"`
	Size        int64     `json:"size"`
	Kind        string    `json:"kind"`
	WrittenAt   time.Time `json:"written_at"`
	ChangesetID int64     `json:"changeset_id"`
}