refacto: refacto repo layer code while adding new usecase methods

internal/howmuch/adapter/repo/db.go

@@ -25,6 +25,7 @@ package repo
 import (
 	"context"
 	"database/sql"
+	"time"
 
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/adapter/repo/sqlc"
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/usecase/repo"
@@ -35,6 +36,8 @@ type dbRepository struct {
 	db *sql.DB
 }
 
+const queryTimeout = 3 * time.Second
+
 func NewDBRepository(db *sql.DB) repo.DBRepository {
 	return &dbRepository{
 		db: db,

internal/howmuch/adapter/repo/event.go

@@ -26,6 +26,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"errors"
 	"time"
 
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/adapter/repo/sqlc"
@@ -136,9 +137,9 @@ func (e *eventRepository) GetByID(
 }
 
 func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]model.EventListRetrieved, error) {
-	var events []model.EventListRetrieved
+	events := make([]model.EventListRetrieved, len(eventsDTO))
 
-	for _, evDTO := range eventsDTO {
+	for i, evDTO := range eventsDTO {
 		var owner model.UserBaseRetrieved
 		err := json.Unmarshal(evDTO.Owner, &owner)
 		if err != nil {
@@ -154,7 +155,7 @@ func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]model.EventListR
 			CreatedAt:   evDTO.CreatedAt,
 		}
 
-		events = append(events, ev)
+		events[i] = ev
 	}
 
 	return events, nil
@@ -199,3 +200,77 @@ func (e *eventRepository) UpdateEventByID(
 	})
 	return err
 }
+
+// GetParticipation implements repo.EventRepository.
+func (e *eventRepository) GetParticipation(
+	ctx context.Context,
+	userID, eventID int,
+	tx any,
+) (*model.ParticipationEntity, error) {
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	partDTO, err := queries.GetParticipation(timeoutCtx, sqlc.GetParticipationParams{
+		UserID:  int32(userID),
+		EventID: int32(eventID),
+	})
+
+	if errors.Is(err, sql.ErrNoRows) {
+		// No error, but participation not found
+		return nil, nil
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &model.ParticipationEntity{
+		ID:              int(partDTO.ID),
+		UserID:          int(partDTO.UserID),
+		EventID:         int(partDTO.EventID),
+		InvitedByUserID: int(partDTO.InvitedByUserID.Int32),
+		CreatedAt:       partDTO.CreatedAt,
+		UpdatedAt:       partDTO.UpdatedAt,
+	}, nil
+}
+
+// InsertParticipation implements repo.EventRepository.
+func (e *eventRepository) InsertParticipation(
+	ctx context.Context,
+	userID int,
+	eventID int,
+	invitedByUserID int,
+	tx any,
+) (*model.ParticipationEntity, error) {
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	var invitedBy sql.NullInt32
+	if invitedByUserID == 0 {
+		invitedBy = sql.NullInt32{Int32: 0, Valid: false}
+	} else {
+		invitedBy = sql.NullInt32{Int32: int32(invitedByUserID), Valid: true}
+	}
+	participationDTO, err := queries.InsertParticipation(timeoutCtx, sqlc.InsertParticipationParams{
+		UserID:          int32(userID),
+		EventID:         int32(eventID),
+		InvitedByUserID: invitedBy,
+		CreatedAt:       time.Now(),
+		UpdatedAt:       time.Now(),
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &model.ParticipationEntity{
+		ID:              int(participationDTO.ID),
+		UserID:          int(participationDTO.UserID),
+		EventID:         int(participationDTO.EventID),
+		InvitedByUserID: int(participationDTO.InvitedByUserID.Int32),
+		CreatedAt:       participationDTO.CreatedAt,
+		UpdatedAt:       participationDTO.UpdatedAt,
+	}, nil
+}

internal/howmuch/adapter/repo/expense.go

@@ -97,15 +97,15 @@ func convToPayments(raw json.RawMessage) ([]model.Payment, error) {
 		return nil, err
 	}
 
-	var payments []model.Payment
-	for _, p := range paymentsRetrieved {
+	payments := make([]model.Payment, len(paymentsRetrieved))
+	for i, p := range paymentsRetrieved {
 		payment := model.Payment{
 			PayerID:        p.PayerID,
 			PayerFirstName: p.PayerFirstName,
 			PayerLastName:  p.PayerLastName,
 			Amount:         model.MakeMoney(p.Amount, model.Currency(p.Currency)),
 		}
-		payments = append(payments, payment)
+		payments[i] = payment
 	}
 
 	return payments, nil
@@ -120,15 +120,15 @@ func convToBenefits(raw json.RawMessage) ([]model.Benefit, error) {
 		return nil, err
 	}
 
-	var benefits []model.Benefit
-	for _, b := range benefitsRetrieved {
+	benefits := make([]model.Benefit, len(benefitsRetrieved))
+	for i, b := range benefitsRetrieved {
 		benefit := model.Benefit{
 			RecipientID:        b.RecipientID,
 			RecipientFirstName: b.RecipientFirstName,
 			RecipientLastName:  b.RecipientLastName,
 			Amount:             model.MakeMoney(b.Amount, model.Currency(b.Currency)),
 		}
-		benefits = append(benefits, benefit)
+		benefits[i] = benefit
 	}
 
 	return benefits, nil
@@ -214,8 +214,8 @@ func (e *expenseRepository) ListExpensesByEventID(
 	if err != nil {
 		return nil, err
 	}
-	var res []model.ExpensesListRetrieved
-	for _, dto := range listDTO {
+	res := make([]model.ExpensesListRetrieved, len(listDTO))
+	for i, dto := range listDTO {
 		elem := model.ExpensesListRetrieved{
 			ID:        int(dto.ID),
 			CreatedAt: dto.CreatedAt,
@@ -227,7 +227,7 @@ func (e *expenseRepository) ListExpensesByEventID(
 				Place: dto.Place.String,
 			},
 		}
-		res = append(res, elem)
+		res[i] = elem
 	}
 	return res, nil
 }

internal/howmuch/adapter/repo/sqlc/participation.sql

@@ -3,3 +3,8 @@ INSERT INTO participation (
     user_id, event_id, invited_by_user_id, created_at, updated_at
 ) VALUES ($1, $2, $3, $4, $5)
 RETURNING *;
+
+-- name: GetParticipation :one
+SELECT id, user_id, event_id, invited_by_user_id, created_at, updated_at
+FROM "participation"
+WHERE user_id = $1 AND event_id = $2;

internal/howmuch/adapter/repo/sqlc/participation.sql.go

@@ -11,6 +11,31 @@ import (
 	"time"
 )
 
+const getParticipation = `-- name: GetParticipation :one
+SELECT id, user_id, event_id, invited_by_user_id, created_at, updated_at
+FROM "participation"
+WHERE user_id = $1 AND event_id = $2
+`
+
+type GetParticipationParams struct {
+	UserID  int32
+	EventID int32
+}
+
+func (q *Queries) GetParticipation(ctx context.Context, arg GetParticipationParams) (Participation, error) {
+	row := q.db.QueryRowContext(ctx, getParticipation, arg.UserID, arg.EventID)
+	var i Participation
+	err := row.Scan(
+		&i.ID,
+		&i.UserID,
+		&i.EventID,
+		&i.InvitedByUserID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}
+
 const insertParticipation = `-- name: InsertParticipation :one
 INSERT INTO participation (
     user_id, event_id, invited_by_user_id, created_at, updated_at

internal/howmuch/adapter/repo/sqlc/querier.go

@@ -13,6 +13,7 @@ type Querier interface {
 	DeleteTransactionsOfExpenseID(ctx context.Context, expenseID int32) error
 	GetEventByID(ctx context.Context, id int32) (GetEventByIDRow, error)
 	GetExpenseByID(ctx context.Context, id int32) (GetExpenseByIDRow, error)
+	GetParticipation(ctx context.Context, arg GetParticipationParams) (Participation, error)
 	GetUserByEmail(ctx context.Context, email string) (User, error)
 	GetUserByID(ctx context.Context, id int32) (User, error)
 	InsertEvent(ctx context.Context, arg InsertEventParams) (Event, error)

internal/howmuch/adapter/repo/user.go

@@ -37,8 +37,6 @@ type userRepository struct {
 	queries *sqlc.Queries
 }
 
-const queryTimeout = 3 * time.Second
-
 func NewUserRepository(db *sql.DB) repo.UserRepository {
 	return &userRepository{
 		queries: sqlc.New(db),

internal/howmuch/model/event.go

@@ -36,7 +36,7 @@ type EventCreateRequest struct {
 // }}}
 // {{{ Response View Object (from service to controller)
 
-type EventBaseItemResponse struct {
+type EventListResponse struct {
 	ID          int
 	Name        string
 	Description string

internal/howmuch/usecase/repo/event.go

@@ -39,7 +39,17 @@ type EventRepository interface {
 	// related to events of a user
 	ListEventsByUserID(ctx context.Context, userID int, tx any) ([]model.EventListRetrieved, error)
 
-	// CheckParticipation(ctx context.Context, userID, eventID int) error
+	InsertParticipation(
+		ctx context.Context,
+		userID, eventID, invitedByUserID int,
+		tx any,
+	) (*model.ParticipationEntity, error)
+
+	GetParticipation(
+		ctx context.Context,
+		userID, eventID int,
+		tx any,
+	) (*model.ParticipationEntity, error)
 }
 
 type ExpenseRepository interface {

internal/howmuch/usecase/usecase/event.go

@@ -74,13 +74,37 @@ func (evuc *eventUsecase) CreateEvent(
 
 	data, err := evuc.dbRepo.Transaction(
 		ctx,
-		func(txCtx context.Context, tx interface{}) (interface{}, error) {
-			// Create
+		func(txCtx context.Context, tx any) (any, error) {
+			// Create the event
 			created, err := evuc.eventRepo.Create(ctx, evEntity, tx)
 			if err != nil {
 				return nil, err
 			}
 
+			// participate to the event
+			participation, err := evuc.eventRepo.InsertParticipation(
+				ctx,
+				created.OwnerID,
+				created.ID,
+				0,
+				tx,
+			)
+			if err != nil {
+				return nil, err
+			}
+
+			if participation == nil {
+				// Unexpected error
+				log.ErrorLog(
+					"participation existed for event-user pair",
+					"userID",
+					created.OwnerID,
+					"eventID",
+					created.ID,
+				)
+				return nil, errno.InternalServerErr
+			}
+
 			// TODO: App log, maybe can be sent to some third party service.
 			log.InfoLog(
 				"created new event",
@@ -90,6 +114,7 @@ func (evuc *eventUsecase) CreateEvent(
 				created.OwnerID,
 			)
 
+			// Construct the response
 			ownerResponse, err := evuc.userUC.GetUserBaseResponseByID(ctx, created.OwnerID)
 			if err != nil {
 				return nil, err
@@ -106,9 +131,11 @@ func (evuc *eventUsecase) CreateEvent(
 				Owner:     ownerResponse,
 				CreatedAt: created.CreatedAt,
 				UpdatedAt: created.UpdatedAt,
+				Users:     []model.UserBaseResponse{*ownerResponse},
 			}
 			return evResponse, err
-		})
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -121,8 +148,28 @@ func (evuc *eventUsecase) CreateEvent(
 func (evuc *eventUsecase) ListEvents(
 	ctx context.Context,
 	userID int,
-) ([]model.EventBaseItemResponse, error) {
-	return nil, nil
+) ([]model.EventListResponse, error) {
+	eventListRetrieved, err := evuc.eventRepo.ListEventsByUserID(ctx, userID, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Check if the user is a member of the event
+
+	responses := make([]model.EventListResponse, len(eventListRetrieved))
+
+	for i, retrieved := range eventListRetrieved {
+		ownner := model.UserBaseResponse(*retrieved.Owner)
+		res := model.EventListResponse{
+			ID:          retrieved.ID,
+			Name:        retrieved.Name,
+			Description: retrieved.Description,
+			Owner:       &ownner,
+			CreatedAt:   retrieved.CreatedAt,
+		}
+		responses[i] = res
+	}
+	return responses, nil
 }
 
 // GetEventDetail