// 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/dnssec"
	"jarl/internal/model"
	"jarl/internal/nscheck"
	"jarl/internal/porkbun"
	"jarl/internal/version"
)

// 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"`
	// DisabledRecords is how many of the records are disabled.
	DisabledRecords int    `json:"disabled_count,omitempty"`
	ZoneFile        string `json:"zone_file,omitempty"` // the file named loads
	RName           string `json:"rname_email,omitempty"`
	// Registrar names the registrar Jarl can manage the domain at
	// ("porkbun"), when one is configured for it.
	Registrar string `json:"registrar,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, delete,
	// disable or enable.
	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"`
	// Formatted is the value laid out over several lines, as in
	// named.conf, when it has a block (for display and editing; Value is
	// the same on one line).
	Formatted string `json:"formatted,omitempty"`
}

// User is a user with formatted grants.
type User struct {
	model.User
	GrantStrings []string `json:"grant_strings"`
	// TOTPRequired says that totp.require in jarl.yaml makes two-factor
	// login compulsory for the user.
	TOTPRequired bool `json:"totp_required,omitempty"`
}

// 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"`
	// TOTP is the user's two-factor login (sessions only).
	TOTP *TOTPStatus `json:"totp,omitempty"`
	// TOTPSetupRequired: the user must set up two-factor login before
	// doing anything else (totp.require).
	TOTPSetupRequired bool `json:"totp_setup_required,omitempty"`
	// Build is what the server was built from (release or commit).
	Build version.Build `json:"build"`
}

// LoginChallenge answers a correct password of a user with two-factor
// login: send a code with the challenge to POST /auth/login/totp.
type LoginChallenge struct {
	TOTPRequired bool   `json:"totp_required"`
	Challenge    string `json:"challenge"`
}

// LoginTOTP is the second login step.
type LoginTOTP struct {
	Challenge string `json:"challenge"`
	// Code is the current code from the authenticator app, or a recovery
	// code.
	Code string `json:"code"`
}

// TOTPStatus is a user's two-factor login (GET /me/totp).
type TOTPStatus struct {
	Enabled           bool       `json:"enabled"`
	EnabledAt         *time.Time `json:"enabled_at,omitempty"`
	Required          bool       `json:"required"`
	RecoveryCodesLeft int        `json:"recovery_codes_left"`
	// Policy is totp.require: none, admins or all.
	Policy string `json:"policy"`
}

// TOTPSetupRequest starts setting up two-factor login.
type TOTPSetupRequest struct {
	Password string `json:"password"`
}

// TOTPSetup is a new secret to put into an authenticator app: QR is the
// QR code of URI, as an image data: URI.
type TOTPSetup struct {
	Secret  string `json:"secret"`
	URI     string `json:"uri"`
	QR      string `json:"qr"`
	Issuer  string `json:"issuer"`
	Account string `json:"account"`
}

// TOTPCode confirms a setup.
type TOTPCode struct {
	Code string `json:"code"`
}

// TOTPDisable turns two-factor login off.
type TOTPDisable struct {
	Password string `json:"password"`
	Code     string `json:"code"`
}

// RecoveryCodes are new recovery codes, shown once.
type RecoveryCodes struct {
	Codes []string `json:"recovery_codes"`
}

// 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"`
	Build   version.Build   `json:"build"`
	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"`
	// TOTP is about two-factor login across users (administrators only).
	TOTP *TOTPOverview `json:"totp,omitempty"`
	// BlocklistErrors are blocklists whose last update failed (for those
	// who may see blocking).
	BlocklistErrors []BlocklistError `json:"blocklist_errors,omitempty"`
	// BlockingPausedUntil is set while blocking is paused for a time,
	// BlockingPausedIndefinitely while it is paused until resumed.
	BlockingPausedUntil        *time.Time `json:"blocking_paused_until,omitempty"`
	BlockingPausedIndefinitely bool       `json:"blocking_paused_indefinitely,omitempty"`
}

// BlocklistError is a blocklist whose last update failed. UpdatedAt is
// the version named keeps using (nil: none yet).
type BlocklistError struct {
	Name      string     `json:"name"`
	Error     string     `json:"error"`
	UpdatedAt *time.Time `json:"updated_at,omitempty"`
}

// TOTPOverview is what the dashboard reports about two-factor login.
type TOTPOverview struct {
	// Policy is totp.require: none, admins or all.
	Policy string `json:"policy"`
	// Missing are enabled users who must use two-factor login and
	// haven't set it up (they can do nothing else until they do).
	Missing []string `json:"missing"`
	// SharedAdmin is set when an enabled administrator called "admin"
	// (the usual first account) exists next to other enabled
	// administrators: it is probably shared, and worth disabling.
	SharedAdmin string `json:"shared_admin,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"`
}

// DNSSECResponse is GET /zones/{zone}/dnssec.
type DNSSECResponse struct {
	Zone string `json:"zone"`
	View string `json:"view,omitempty"`
	Type string `json:"type"`
	*dnssec.Status
	// ParentZone is set when the parent zone is a primary zone in Jarl
	// (in the same view): the DS record then goes there, as a record.
	ParentZone   string `json:"parent_zone,omitempty"`
	ParentZoneID int64  `json:"parent_zone_id,omitempty"`
	ParentView   string `json:"parent_view,omitempty"`
	// ParentDS is the DS records the parent zone in Jarl has for the
	// zone (record data, e.g. "51126 13 2 FFBE...").
	ParentDS []string `json:"parent_ds,omitempty"`
	// Registrar names the registrar Jarl can publish the DS at
	// ("porkbun"), when one is configured in jarl.yaml.
	Registrar string `json:"registrar,omitempty"`
}

// CheckDSResponse is POST /zones/{zone}/dnssec/check-ds: what the parent
// zone has, and what named was told.
type CheckDSResponse struct {
	Parent *nscheck.ParentDSReport `json:"parent"`
	Marked []string                `json:"marked"`
	Notes  []string                `json:"notes"`
	Status *dnssec.Status          `json:"status"`
}

// DNSSECWipe is POST /zones/{zone}/dnssec/wipe.
type DNSSECWipe struct {
	// Force wipes although the parent zone's DS records couldn't be
	// checked, or named still counts a removed DS as cached.
	Force  bool `json:"force,omitempty"`
	DryRun bool `json:"dry_run,omitempty"`
}

// DNSSECWipeResponse is the result of a wipe.
type DNSSECWipeResponse struct {
	Removed     []string                `json:"removed"`
	DryRun      bool                    `json:"dry_run,omitempty"`
	ChangesetID int64                   `json:"changeset_id,omitempty"`
	Parent      *nscheck.ParentDSReport `json:"parent,omitempty"`
}

// RegistrarResponse is GET /zones/{zone}/registrar: the domain's
// delegation at the registrar, next to what the zone says.
type RegistrarResponse struct {
	Registrar string `json:"registrar"` // "porkbun"
	Domain    string `json:"domain"`
	// NS are the name servers at the registry, JarlNS those in the
	// zone's NS records (both without trailing dots).
	NS      []string `json:"ns"`
	JarlNS  []string `json:"jarl_ns"`
	NSMatch bool     `json:"ns_match"`
	// Glue covers every glue record at the registry and every name server
	// inside the zone that needs one.
	Glue []GlueStatus `json:"glue"`
	// DS are the DS records at the registry.
	DS       []RegistrarDS     `json:"ds"`
	Findings []nscheck.Finding `json:"findings"`
	// Error is set when the registrar couldn't be asked; the rest is
	// then empty.
	Error string `json:"error,omitempty"`
}

// GlueStatus compares a glue record at the registry with the zone.
type GlueStatus struct {
	Host     string   `json:"host"`
	Registry []string `json:"registry"` // addresses at the registry (none: no glue record)
	Jarl     []string `json:"jarl"`     // the zone's A and AAAA records for the host
	// Needed: a name server in the zone's NS records that is inside the
	// domain, so resolvers need its glue. InUse: in the registry's NS.
	Needed bool `json:"needed"`
	InUse  bool `json:"in_use"`
	// Action is what syncing the glue does: "create", "update" or "".
	Action string `json:"action,omitempty"`
}

// RegistrarDS is a DS record at the registry.
type RegistrarDS struct {
	porkbun.DS
	// Matches: it points at a key named publishes for the zone.
	Matches bool `json:"matches"`
}

// RegistrarChange asks for a change at the registrar.
type RegistrarChange struct {
	// NS (set-ns) are the name servers to set (default: the zone's NS
	// records).
	NS []string `json:"ns,omitempty"`
	// KeyTag (publish DS) picks the key (default: every key that needs
	// one).
	KeyTag uint16 `json:"key_tag,omitempty"`
	// Force skips the checks that the change won't break the domain.
	Force  bool `json:"force,omitempty"`
	DryRun bool `json:"dry_run,omitempty"`
}

// RegistrarChangeResponse is the result of a change at the registrar.
type RegistrarChangeResponse struct {
	// Done lists what was changed (or would be, in a dry run).
	Done     []string          `json:"done"`
	DryRun   bool              `json:"dry_run,omitempty"`
	Checks   []nscheck.Finding `json:"checks"`
	Warnings []string          `json:"warnings"`
}

// Blocklist is a blocklist as returned by the API (docs/blocking.md).
type Blocklist struct {
	model.Blocklist
	// Views are the views it applies to; AutoViews is set when that is
	// "every view that offers recursion" (view_ids is empty).
	Views     []string `json:"views"`
	AutoViews bool     `json:"auto_views,omitempty"`
	// State is ok, waiting (not downloaded yet), error (the last update
	// failed; the previous version stays in use), disabled, or idle (it
	// applies to no view).
	State  string                 `json:"state"`
	Status *model.BlocklistStatus `json:"status,omitempty"`
	// MemoryMB estimates what named needs for the list, in all its views.
	MemoryMB int    `json:"memory_mb,omitempty"`
	Pending  string `json:"pending,omitempty"`
}

// BlockRule is a block or allow rule as returned by the API.
type BlockRule struct {
	model.BlockRule
	Views     []string `json:"views"`
	AutoViews bool     `json:"auto_views,omitempty"`
	Pending   string   `json:"pending,omitempty"`
}