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package guest
import (
"context"
"errors"
"github.com/jackc/pgx/v5"
"github.com/jackc/pgx/v5/pgxpool"
)
type Store struct {
database *pgxpool.Pool
}
func NewStore(database *pgxpool.Pool) *Store {
return &Store{
database,
}
}
func (store Store) Find(credentials Credentials) (Guest, error) {
guestRows, err := store.database.Query(context.Background(),
"select * from guest")
if err != nil {
return Guest{}, err
}
defer guestRows.Close()
guest, found := createGuest(credentials, guestRows)
partyRows, err := store.database.Query(context.Background(),
"select * from party")
if err != nil {
return Guest{}, err
}
defer partyRows.Close()
guest, err = addParty(guest, partyRows)
if err != nil {
return Guest{}, err
}
if found {
return guest, nil
}
return Guest{}, errors.New("guest not found")
}
func createGuest(credentials Credentials, guestRows pgx.Rows) (Guest, bool) {
var guest Guest
for guestRows.Next() {
err := guestRows.Scan(&guest.ID, &guest.FirstName, &guest.LastName,
&guest.Attendance, &guest.Email, &guest.Message, &guest.PartySize)
if err != nil {
return Guest{}, false
}
if guest.FirstName == credentials.FirstName &&
guest.LastName == credentials.LastName {
return guest, true
}
}
return Guest{}, false
}
func addParty(guestWithoutParty Guest, partyRows pgx.Rows) (Guest, error) {
guestWithParty := guestWithoutParty
for partyRows.Next() {
var guestID int
var partyGuest PartyGuest
err := partyRows.Scan(&guestID, &partyGuest.FirstName, &partyGuest.LastName)
if err != nil {
return Guest{}, err
}
if guestID == guestWithParty.ID {
guestWithParty.PartyList = append(guestWithParty.PartyList, partyGuest)
}
}
return guestWithParty, nil
}
func (store Store) Get() ([]Guest, error) {
guestRows, err := store.database.Query(context.Background(),
"select * from guest")
if err != nil {
return nil, err
}
defer guestRows.Close()
guestsWithoutParty, err := store.createGuestSlice(guestRows)
if err != nil {
return []Guest{}, err
}
partyRows, err := store.database.Query(context.Background(),
"select * from party")
if err != nil {
return []Guest{}, err
}
defer partyRows.Close()
guestsWithParty, err := addPartySlice(guestsWithoutParty, partyRows)
if err != nil {
return []Guest{}, err
}
return guestsWithParty, nil
}
func (store Store) createGuestSlice(guestRows pgx.Rows) ([]Guest, error) {
guests := []Guest{}
for guestRows.Next() {
var guest Guest
err := guestRows.Scan(&guest.ID, &guest.FirstName, &guest.LastName,
&guest.Attendance, &guest.Email, &guest.Message, &guest.PartySize)
if err != nil {
return []Guest{}, err
}
guests = append(guests, guest)
}
return guests, nil
}
func addPartySlice(guestsWithoutParty []Guest,
partyRows pgx.Rows) ([]Guest, error) {
guestsWithParty := guestsWithoutParty
for partyRows.Next() {
var guestID int
var partyGuest PartyGuest
err := partyRows.Scan(&guestID, &partyGuest.FirstName, &partyGuest.LastName)
if err != nil {
return []Guest{}, err
}
for i, guest := range guestsWithParty {
if guestID == guest.ID {
guestsWithParty[i].PartyList = append(guest.PartyList, partyGuest)
}
}
}
return guestsWithParty, nil
}
func (store Store) Add(guest Guest) error {
if err := store.insertGuest(guest); err != nil {
return err
}
return store.insertParty(guest)
}
func (store Store) insertGuest(guest Guest) error {
statement := `insert into guest (id, first_name, last_name, attendance,
email, message, party_size) values ($1, $2, $3, $4, $5, $6, $7)`
_, err := store.database.Exec(context.Background(), statement, guest.ID,
guest.FirstName, guest.LastName, guest.Attendance, guest.Email,
guest.Message, guest.PartySize)
return err
}
func (store Store) Update(guest Guest) error {
if err := store.updateGuest(guest); err != nil {
return err
}
if err := store.deleteOldParty(guest.ID); err != nil {
return err
}
return store.insertParty(guest)
}
func (store Store) updateGuest(guest Guest) error {
statement := `update guest set attendance = $1, email = $2, message = $3,
party_size = $4 where id = $5`
_, err := store.database.Exec(context.Background(), statement,
guest.Attendance, guest.Email, guest.Message, guest.PartySize, guest.ID)
return err
}
func (store Store) deleteOldParty(guestID int) error {
statement := "delete from party where guest_id = $1"
_, err := store.database.Exec(context.Background(), statement, guestID)
return err
}
func (store Store) insertParty(guest Guest) error {
statement := `insert into party (guest_id, first_name, last_name)
values ($1, $2, $3)`
for _, pg := range guest.PartyList {
_, err := store.database.Exec(context.Background(), statement, guest.ID,
pg.FirstName, pg.LastName)
if err != nil {
return err
}
}
return nil
}
|
