package model

import (
	"time"
)

type DocumentVersion struct {
	Id         int       `json:"id" gorm:"primaryKey"`
	DocumentId int       `json:"document_id" gorm:"index;not null"`
	Content    string    `json:"content" gorm:"type:text;not null"`
	AuthorId   int       `json:"author_id" gorm:"not null"`
	CreatedAt  time.Time `json:"created_at" gorm:"autoCreateTime"`
}

func GetDocumentVersions(documentId int, startIdx int, num int) ([]*DocumentVersion, int64, error) {
	query := DB.Model(&DocumentVersion{}).Where("document_id = ?", documentId)
	var total int64
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}
	var versions []*DocumentVersion
	if err := query.Order("id DESC").Offset(startIdx).Limit(num).Find(&versions).Error; err != nil {
		return nil, 0, err
	}
	return versions, total, nil
}

func CreateDocumentVersion(version *DocumentVersion) error {
	return DB.Create(version).Error
}