package Database

import (
	"database/sql"
	"time"

	"github.com/gofrs/uuid"

	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

// Message holds data pertaining to each users' message
type Message struct {
	Base
	MessageDataID  uuid.UUID    `                       json:"message_data_id"`
	MessageData    MessageData  `                       json:"message_data"`
	SymmetricKey   string       `gorm:"not null"        json:"symmetric_key"`   // Stored encrypted
	AssociationKey string       `gorm:"not null"        json:"association_key"` // Stored encrypted
	ExpiryRaw      string       `                       json:"expiry"`
	Expiry         sql.NullTime `                       json:"-"`
	CreatedAt      time.Time    `gorm:"not null"        json:"created_at"`
}

type MessageList []Message

// GetMessageByID gets a message
func GetMessageByID(id string) (Message, error) {
	var (
		message Message
		err     error
	)

	err = DB.Preload(clause.Associations).
		First(&message, "id = ?", id).
		Error

	return message, err
}

// GetMessagesByAssociationKey for getting whole thread
func GetMessagesByAssociationKey(associationKey string, page int) ([]Message, error) {
	var (
		messages []Message
		offset   int
		err      error
	)

	offset = page * PageSize

	err = DB.Preload("MessageData").
		Preload("MessageData.Attachment").
		Offset(offset).
		Limit(PageSize).
		Order("created_at DESC").
		Find(&messages, "association_key = ?", associationKey).
		Error

	return messages, err
}

// CreateMessage creates a message record
func (message *Message) CreateMessage() error {
	var err error

	err = DB.Session(&gorm.Session{FullSaveAssociations: true}).
		Create(message).
		Error

	return err
}

// CreateMessages creates multiple records
func (messages *MessageList) CreateMessages() error {
	var err error

	err = DB.Session(&gorm.Session{FullSaveAssociations: true}).
		Create(messages).
		Error

	return err
}

// DeleteMessage deletes a message
func (message *Message) DeleteMessage() error {
	return DB.Session(&gorm.Session{FullSaveAssociations: true}).
		Delete(message).
		Error
}