package models

import (
	"time"

	"github.com/google/uuid"
)

// DocumentVersion represents a snapshot of a document at a point in time
type DocumentVersion struct {
	ID              uuid.UUID  `json:"id"`
	DocumentID      uuid.UUID  `json:"document_id"`
	YjsSnapshot     []byte     `json:"-"`            // Omit from JSON (binary)
	TextPreview     *string    `json:"text_preview"` // Full plain text
	VersionNumber   int        `json:"version_number"`
	CreatedBy       *uuid.UUID `json:"created_by"`
	VersionLabel    *string    `json:"version_label"`
	IsAutoGenerated bool       `json:"is_auto_generated"`
	CreatedAt       time.Time  `json:"created_at"`
}

// DocumentVersionWithAuthor includes author information
type DocumentVersionWithAuthor struct {
	DocumentVersion
	Author *User `json:"author,omitempty"` // Nullable if user deleted
}

// CreateVersionRequest is the API request for manual snapshots
type CreateVersionRequest struct {
	VersionLabel *string `json:"version_label"` // Optional user label
	TextPreview  *string `json:"text_preview"`  // Frontend-generated full text
	// YjsSnapshot sent as multipart file, not JSON
}

// RestoreVersionRequest specifies which version to restore
type RestoreVersionRequest struct {
	VersionID uuid.UUID `json:"version_id" binding:"required"`
}

// VersionListResponse for listing versions
type VersionListResponse struct {
	Versions []DocumentVersionWithAuthor `json:"versions"`
	Total    int                         `json:"total"`
}