// Package api defines the JSON types of Jarl's HTTP API, shared by the
// server and the Go client used by the CLI.
package api

import (
	"encoding/json"
	"time"

	"jarl/internal/model"
	"jarl/internal/nscheck"
)

// Version is the API path prefix.
const Prefix = "/api/v1"

// Zone is a zone as returned by the API.
type Zone struct {
	model.Zone
	Display  string `json:"display_name"`
	View     string `json:"view,omitempty"`
	Records  int    `json:"record_count"`
	ZoneFile string `json:"zone_file,omitempty"` // the file named loads
	RName    string `json:"rname_email,omitempty"`
	// Pending is set when listing with a changeset: add, change or delete.
	Pending string `json:"pending,omitempty"`
}

// Record is a record as returned by the API.
type Record struct {
	model.Record
	Zone         string `json:"zone"`
	View         string `json:"view,omitempty"`
	RelativeName string `json:"relative_name"`
	EffectiveTTL uint32 `json:"effective_ttl"`
	// Text is the decoded value of TXT and SPF records.
	Text *string `json:"text,omitempty"`
	// Pending is set when listing with a changeset: add, change or delete.
	Pending string `json:"pending,omitempty"`
}

// View is a view with its zone count.
type View struct {
	model.View
	Zones int    `json:"zone_count"`
	Color string `json:"color,omitempty"` // web UI colour, see model.ViewColors
}

// ViewColor sets the colour the web UI shows a view in.
type ViewColor struct {
	Color string `json:"color"`
}

// ACL is an ACL with the objects that use it.
type ACL struct {
	model.ACL
	UsedBy []string `json:"used_by"`
}

// TSIGKey is a key; Secret is only filled when asked for and allowed.
type TSIGKey struct {
	model.TSIGKey
	UsedBy []string `json:"used_by"`
}

// Option is an option with display helpers.
type Option struct {
	model.Option
	Where       string `json:"where"` // e.g. "view internal"
	Description string `json:"description,omitempty"`
	Status      string `json:"status,omitempty"`
}

// User is a user with formatted grants.
type User struct {
	model.User
	GrantStrings []string `json:"grant_strings"`
}

// Token is an API token. Secret is only set when the token is created.
type Token struct {
	model.Token
	GrantStrings []string `json:"grant_strings,omitempty"`
	Secret       string   `json:"token,omitempty"`
}

// Whoami describes the authenticated principal.
type Whoami struct {
	User        User     `json:"user"`
	Method      string   `json:"method"`
	Token       *Token   `json:"token,omitempty"`
	CSRFToken   string   `json:"csrf_token,omitempty"`
	Permissions []string `json:"permissions"`
	Admin       bool     `json:"admin"`
	Version     string   `json:"version"`
}

// LoginRequest logs in.
type LoginRequest struct {
	Username string `json:"username"`
	Password string `json:"password"`
}

// ErrorBody is the error response.
type ErrorBody struct {
	Error ErrorInfo `json:"error"`
}

// ErrorInfo describes an error.
type ErrorInfo struct {
	Code     string          `json:"code"`
	Message  string          `json:"message"`
	Op       int             `json:"op,omitempty"`
	Problems json.RawMessage `json:"problems,omitempty"`
	Check    json.RawMessage `json:"check,omitempty"`
	Result   json.RawMessage `json:"result,omitempty"`
}

// ChangeRequest is a request in a batch (POST /apply or changeset ops).
type ChangeRequest struct {
	Op          string          `json:"op"`
	ID          int64           `json:"id,omitempty"`
	BaseVersion int             `json:"base_version,omitempty"`
	Data        json.RawMessage `json:"data,omitempty"`
}

// BatchRequest applies (or stages) several requests at once.
type BatchRequest struct {
	Description string          `json:"description,omitempty"`
	Ops         []ChangeRequest `json:"ops"`
	DryRun      bool            `json:"dry_run,omitempty"`
	Force       bool            `json:"force,omitempty"`
	// Apply (for POST /changesets) applies the new changeset at once.
	Apply bool `json:"apply,omitempty"`
}

// MutationResponse is returned by endpoints that change the configuration.
type MutationResponse struct {
	Applied     bool            `json:"applied"`
	Staged      bool            `json:"staged,omitempty"`
	DryRun      bool            `json:"dry_run,omitempty"`
	ChangesetID int64           `json:"changeset_id,omitempty"`
	Result      json.RawMessage `json:"result,omitempty"`
	Changeset   json.RawMessage `json:"changeset,omitempty"`
	Added       []model.Op      `json:"added,omitempty"`
	Warnings    []string        `json:"warnings,omitempty"`
	Problems    json.RawMessage `json:"problems,omitempty"`
	Object      json.RawMessage `json:"object,omitempty"`
}

// Changeset is a changeset as returned by the API.
type Changeset struct {
	model.Changeset
	Undoable bool `json:"undoable"`
}

// StatusResponse is GET /status.
type StatusResponse struct {
	Version string          `json:"version"`
	Engine  json.RawMessage `json:"engine"`
	Time    time.Time       `json:"time"`
	// ExpiringTokens are tokens that expire within TokenExpiryWarning or
	// expired less than that long ago (not revoked): every user's for
	// administrators, otherwise the caller's own.
	ExpiringTokens []Token `json:"expiring_tokens"`
	// Backup is the state of database backups (administrators only).
	Backup *BackupStatus `json:"backup,omitempty"`
}

// TokenExpiresHeader is sent with responses to a token that expires
// soon (model.TokenExpiryWarning), holding its expiry time (RFC 3339). The
// CLI warns its user when it sees it.
const TokenExpiresHeader = "Jarl-Token-Expires"

// BackupStatus describes the newest database backup, as recorded by
// 'jarld backup'.
type BackupStatus struct {
	LastAt    *time.Time `json:"last_at,omitempty"`
	LastFile  string     `json:"last_file,omitempty"`
	LastSize  int64      `json:"last_size,omitempty"`
	LastError string     `json:"last_error,omitempty"`
	// LastErrorAt is when the newest failed backup ran (only reported
	// when it is newer than the last success).
	LastErrorAt *time.Time `json:"last_error_at,omitempty"`
	Dir         string     `json:"dir"`
	// WarnAfter (seconds) is how old the newest backup may get before
	// Stale is set (0: never).
	WarnAfter int64 `json:"warn_after"`
	Stale     bool  `json:"stale"`
}

// SearchResult is one search hit.
type SearchResult struct {
	Kind   string `json:"kind"` // zone, record, acl, view, key
	ID     int64  `json:"id"`
	ZoneID int64  `json:"zone_id,omitempty"`
	Label  string `json:"label"`
	Detail string `json:"detail,omitempty"`
}

// PasswordChange changes a password.
type PasswordChange struct {
	Current  string `json:"current_password,omitempty"`
	Password string `json:"password"`
}

// UserInput creates or updates a user.
type UserInput struct {
	Username *string        `json:"username,omitempty"`
	Password *string        `json:"password,omitempty"`
	Admin    *bool          `json:"admin,omitempty"`
	Grants   *[]model.Grant `json:"grants,omitempty"`
	// GrantStrings are grants in compact form ("records:write zones=x").
	GrantStrings *[]string `json:"grant_strings,omitempty"`
	Role         *string   `json:"role,omitempty"` // a role template name
	Disabled     *bool     `json:"disabled,omitempty"`
	Comment      *string   `json:"comment,omitempty"`
}

// TokenInput creates a token.
type TokenInput struct {
	Name         string         `json:"name"`
	Grants       *[]model.Grant `json:"grants,omitempty"`
	GrantStrings *[]string      `json:"grant_strings,omitempty"`
	Role         string         `json:"role,omitempty"`
	ExpiresIn    string         `json:"expires_in,omitempty"` // e.g. "90d", "720h"
	ExpiresAt    *time.Time     `json:"expires_at,omitempty"`
}

// TokenRotation gives a token a new secret (POST /tokens/{id}/rotate).
// Every field is optional.
type TokenRotation struct {
	// Grace keeps the old secret working this long (e.g. "1h", "2d"; at
	// most 7d), so clients can be updated without an outage. Default:
	// the old secret stops at once.
	Grace string `json:"grace,omitempty"`
	// The new expiry. Default: a token that expires gets its lifetime
	// again, counted from now; one that doesn't, still doesn't.
	ExpiresIn string     `json:"expires_in,omitempty"`
	ExpiresAt *time.Time `json:"expires_at,omitempty"`
	NoExpiry  bool       `json:"no_expiry,omitempty"`
}

// ZoneImport imports zone file text into a zone.
type ZoneImport struct {
	Text string `json:"text"`
	// Mode "merge" adds missing records; "replace" makes the zone equal
	// to the file (deleting other records).
	Mode   string `json:"mode"`
	DryRun bool   `json:"dry_run,omitempty"`
	// UseSOA also takes the SOA timers and default TTL from the file.
	UseSOA bool `json:"use_soa,omitempty"`
}

// SerialsResponse is GET /zones/{zone}/serials.
type SerialsResponse struct {
	Zone string `json:"zone"`
	View string `json:"view,omitempty"`
	Type string `json:"type"`
	// Serial is what this server serves: named's loaded serial, or for a
	// primary zone Jarl's when named can't be asked (SerialSource says
	// which).
	Serial       *uint32          `json:"serial"`
	SerialSource string           `json:"serial_source,omitempty"`
	Servers      []nscheck.Result `json:"servers"`
	Notes        []string         `json:"notes"`
	CheckedAt    time.Time        `json:"checked_at"`
}

// DelegationResponse is GET /zones/{zone}/delegation.
type DelegationResponse struct {
	*nscheck.DelegationReport
	View      string    `json:"view,omitempty"`
	Notes     []string  `json:"notes"`
	CheckedAt time.Time `json:"checked_at"`
}