package domain

import (
	"errors"
	"time"

	"github.com/google/uuid"
)

type RSVPResponse string

const (
	RSVPAttending RSVPResponse = "attending"
	RSVPDeclined  RSVPResponse = "declined"
	RSVPMaybe     RSVPResponse = "maybe"
)

func (r RSVPResponse) Valid() bool {
	switch r {
	case RSVPAttending, RSVPDeclined, RSVPMaybe:
		return true
	}
	return false
}

type RSVP struct {
	ID                uuid.UUID      `json:"id"`
	GuestID           uuid.UUID      `json:"guest_id"`
	Response          RSVPResponse   `json:"response"`
	PlusOnes          int            `json:"plus_ones"`
	DietaryNotes      *string        `json:"dietary_notes,omitempty"`
	SubmittedAt       time.Time      `json:"submitted_at"`
	DeviceFingerprint map[string]any `json:"device_fingerprint,omitempty"`
	IPAddress         *string        `json:"ip_address,omitempty"`
	RiskScore         *int           `json:"risk_score,omitempty"`
	EditCount         int            `json:"edit_count"`
}

// RSVPRevision is one snapshot of an RSVP's previous state, written before
// the new values are applied on PATCH /rsvp/{token}. The host history view
// renders these newest-first so the edit trail is auditable.
type RSVPRevision struct {
	ID           uuid.UUID    `json:"id"`
	RSVPID       uuid.UUID    `json:"rsvp_id"`
	PrevResponse RSVPResponse `json:"prev_response"`
	PrevPlusOnes int          `json:"prev_plus_ones"`
	PrevDietary  *string      `json:"prev_dietary,omitempty"`
	ChangedAt    time.Time    `json:"changed_at"`
}

// MaxRSVPEdits caps the number of times a single RSVP can be revised.
// The 6th attempt returns 429 — keeps a hostile actor from churning the
// host's activity feed with endless updates.
const MaxRSVPEdits = 5

var (
	ErrRSVPAlreadySubmitted = errors.New("rsvp already submitted")
	ErrRSVPBlocked          = errors.New("rsvp blocked due to fraud risk")
	ErrRSVPNotFound         = errors.New("rsvp not found")
	ErrRSVPEditLimitReached = errors.New("rsvp edit limit reached")
)