package engine

import (
	"encoding/json"

	"jarl/internal/model"
)

// Operation kinds.
const (
	OpZoneCreate     = "zone.create"
	OpZoneUpdate     = "zone.update"
	OpZoneDelete     = "zone.delete"
	OpRecordCreate   = "record.create"
	OpRecordUpdate   = "record.update"
	OpRecordDelete   = "record.delete"
	OpRRSetReplace   = "rrset.replace"
	OpViewCreate     = "view.create"
	OpViewUpdate     = "view.update"
	OpViewDelete     = "view.delete"
	OpViewReorder    = "view.reorder"
	OpACLCreate      = "acl.create"
	OpACLUpdate      = "acl.update"
	OpACLDelete      = "acl.delete"
	OpTSIGCreate     = "tsig.create"
	OpTSIGUpdate     = "tsig.update"
	OpTSIGDelete     = "tsig.delete"
	OpOptionCreate   = "option.create"
	OpOptionUpdate   = "option.update"
	OpOptionDelete   = "option.delete"
	OpSettingsUpdate = "settings.update"
)

// OpKinds lists all operation kinds.
var OpKinds = []string{OpZoneCreate, OpZoneUpdate, OpZoneDelete, OpRecordCreate, OpRecordUpdate, OpRecordDelete, OpRRSetReplace,
	OpViewCreate, OpViewUpdate, OpViewDelete, OpViewReorder, OpACLCreate, OpACLUpdate, OpACLDelete,
	OpTSIGCreate, OpTSIGUpdate, OpTSIGDelete, OpOptionCreate, OpOptionUpdate, OpOptionDelete, OpSettingsUpdate}

// Request is an operation as submitted by a client. Requests are expanded
// into one or more stored operations (for example an A record with "ptr"
// also creates the matching PTR record).
type Request struct {
	Op string `json:"op"`
	// ID is the object to update or delete.
	ID int64 `json:"id,omitempty"`
	// BaseVersion, if set, makes the request fail when the object's
	// version differs (optimistic locking). Otherwise the version at
	// staging time is recorded.
	BaseVersion int             `json:"base_version,omitempty"`
	Data        json.RawMessage `json:"data,omitempty"`
}

// NewRequest builds a request with data marshaled from an input struct.
func NewRequest(op string, id int64, data any) Request {
	r := Request{Op: op, ID: id}
	if data != nil {
		b, err := json.Marshal(data)
		if err != nil {
			panic(err)
		}
		r.Data = b
	}
	return r
}

// SOAInput sets SOA fields of a primary zone.
type SOAInput struct {
	MName   *string `json:"mname,omitempty"`
	RName   *string `json:"rname,omitempty"` // mailbox name or email address
	Serial  *uint32 `json:"serial,omitempty"`
	Refresh *uint32 `json:"refresh,omitempty"`
	Retry   *uint32 `json:"retry,omitempty"`
	Expire  *uint32 `json:"expire,omitempty"`
	Minimum *uint32 `json:"minimum,omitempty"`
}

// ZoneInput creates or updates a zone.
type ZoneInput struct {
	// Name is the zone name. For create, a CIDR prefix such as
	// "192.168.1.0/24" creates the matching reverse zone.
	Name         *string   `json:"name,omitempty"`
	ViewID       *int64    `json:"view_id,omitempty"`
	View         *string   `json:"view,omitempty"` // view name, alternative to view_id
	Type         *string   `json:"type,omitempty"`
	InView       *string   `json:"in_view,omitempty"`
	File         *string   `json:"file,omitempty"`
	SOA          *SOAInput `json:"soa,omitempty"`
	DefaultTTL   *uint32   `json:"default_ttl,omitempty"`
	SerialPolicy *string   `json:"serial_policy,omitempty"`
	Comment      *string   `json:"comment,omitempty"`

	// Create only: name servers for the apex NS records (default: the
	// configured default name servers), additional records, and a zone to
	// copy records from.
	Nameservers []string      `json:"nameservers,omitempty"`
	Records     []RecordInput `json:"records,omitempty"`
	CloneFrom   int64         `json:"clone_from,omitempty"`
	// Options (create only) are zone options to set, e.g. primaries for a
	// secondary zone or forwarders for a forward zone.
	Options []ZoneOption `json:"options,omitempty"`
}

// ZoneOption is an option given when creating a zone.
type ZoneOption struct {
	Name    string `json:"name"`
	Value   string `json:"value"`
	Comment string `json:"comment,omitempty"`
}

// RecordInput creates, updates or (by match) deletes a record.
type RecordInput struct {
	ZoneID  int64             `json:"zone_id,omitempty"`
	Zone    string            `json:"zone,omitempty"` // zone name, alternative to zone_id
	View    string            `json:"view,omitempty"` // view of Zone
	Name    *string           `json:"name,omitempty"`
	Type    *string           `json:"type,omitempty"`
	TTL     model.Opt[uint32] `json:"ttl,omitzero"` // null: use the zone default
	Data    *string           `json:"data,omitempty"`
	Comment *string           `json:"comment,omitempty"`
	// PTR also creates (or deletes) the matching PTR record in the
	// reverse zone, for A and AAAA records.
	PTR bool `json:"ptr,omitempty"`
	// MissingOK makes a delete-by-match succeed when nothing matches.
	MissingOK bool `json:"missing_ok,omitempty"`
}

// RRSetInput replaces all records of one name and type.
type RRSetInput struct {
	ZoneID  int64             `json:"zone_id,omitempty"`
	Zone    string            `json:"zone,omitempty"`
	View    string            `json:"view,omitempty"`
	Name    string            `json:"name"`
	Type    string            `json:"type"`
	TTL     model.Opt[uint32] `json:"ttl,omitzero"`
	Data    []string          `json:"data"`
	Comment *string           `json:"comment,omitempty"`
	// NewIDs are allocated for records that need to be created.
	NewIDs []int64 `json:"new_ids,omitempty"`
}

// ViewInput creates or updates a view.
type ViewInput struct {
	Name               *string         `json:"name,omitempty"`
	MatchClients       *[]string       `json:"match_clients,omitempty"`
	MatchDestinations  *[]string       `json:"match_destinations,omitempty"`
	MatchRecursiveOnly model.Opt[bool] `json:"match_recursive_only,omitzero"`
	Comment            *string         `json:"comment,omitempty"`
	Position           *int            `json:"position,omitempty"`
	// AdoptZones (create) moves all zones that are not in a view into the
	// new view; named requires every zone to be in a view once views
	// are used.
	AdoptZones bool `json:"adopt_zones,omitempty"`
	// Cascade (delete) also deletes the view's zones.
	Cascade bool `json:"cascade,omitempty"`
}

// ReorderInput sets the order of views.
type ReorderInput struct {
	IDs []int64 `json:"ids"`
}

// ACLInput creates or updates an ACL.
type ACLInput struct {
	Name     *string   `json:"name,omitempty"`
	Elements *[]string `json:"elements,omitempty"`
	Comment  *string   `json:"comment,omitempty"`
}

// TSIGInput creates or updates a TSIG key. A missing secret on create is
// generated.
type TSIGInput struct {
	Name      *string `json:"name,omitempty"`
	Algorithm *string `json:"algorithm,omitempty"`
	Secret    *string `json:"secret,omitempty"`
	Comment   *string `json:"comment,omitempty"`
}

// OptionInput creates or updates an option.
type OptionInput struct {
	Scope    *string `json:"scope,omitempty"`    // options, view, zone, toplevel
	ScopeID  *int64  `json:"scope_id,omitempty"` // view or zone ID
	Name     *string `json:"name,omitempty"`
	Value    *string `json:"value,omitempty"`
	Comment  *string `json:"comment,omitempty"`
	Position *int    `json:"position,omitempty"`
}

// SettingsInput updates Jarl's settings.
type SettingsInput struct {
	DefaultTTL   *uint32   `json:"default_ttl,omitempty"`
	Nameservers  *[]string `json:"nameservers,omitempty"`
	RName        *string   `json:"rname,omitempty"`
	Refresh      *uint32   `json:"refresh,omitempty"`
	Retry        *uint32   `json:"retry,omitempty"`
	Expire       *uint32   `json:"expire,omitempty"`
	NegativeTTL  *uint32   `json:"negative_ttl,omitempty"`
	SerialPolicy *string   `json:"serial_policy,omitempty"`
}

// DeleteInput carries options for delete operations.
type DeleteInput struct {
	Cascade bool `json:"cascade,omitempty"`
}