feat: add ImportWatchlist to service

api/watchlist/service.go

@@ -3,8 +3,11 @@ package watchlist
 import (
 	"context"
 	"database/sql"
+	"encoding/csv"
 	"errors"
 	"fmt"
+	"io"
+	"strconv"
 	"strings"
 
 	"github.com/google/uuid"
@@ -186,3 +189,53 @@ func (s *Service) DeleteContinueWatching(ctx context.Context, userID string, ani
 
 	return tx.Commit()
 }
+
+func (s *Service) ImportWatchlist(ctx context.Context, userID string, r io.Reader) error {
+	reader := csv.NewReader(r)
+	// Read header
+	if _, err := reader.Read(); err != nil {
+		return fmt.Errorf("failed to read csv header: %w", err)
+	}
+
+	records, err := reader.ReadAll()
+	if err != nil {
+		return fmt.Errorf("failed to read csv records: %w", err)
+	}
+
+	for i, record := range records {
+		if len(record) < 4 {
+			continue // Skip malformed rows
+		}
+
+		animeID, err := strconv.ParseInt(record[0], 10, 64)
+		if err != nil {
+			return fmt.Errorf("row %d: invalid anime id: %w", i+1, err)
+		}
+
+		status := record[1]
+		if _, ok := validStatuses[status]; !ok {
+			status = "plan_to_watch"
+		}
+
+		currentEpisode, _ := strconv.ParseInt(record[2], 10, 64)
+		currentTimeSeconds, _ := strconv.ParseFloat(record[3], 64)
+
+		if err := s.ensureAnimeExists(ctx, animeID); err != nil {
+			return fmt.Errorf("row %d: failed to ensure anime: %w", i+1, err)
+		}
+
+		_, err = s.db.UpsertWatchListEntry(ctx, db.UpsertWatchListEntryParams{
+			ID:                 uuid.New().String(),
+			UserID:             userID,
+			AnimeID:            animeID,
+			Status:             status,
+			CurrentEpisode:     sql.NullInt64{Int64: currentEpisode, Valid: currentEpisode > 0},
+			CurrentTimeSeconds: currentTimeSeconds,
+		})
+		if err != nil {
+			return fmt.Errorf("row %d: failed to upsert entry: %w", i+1, err)
+		}
+	}
+
+	return nil
+}

api/watchlist/service_test.go

@@ -2,6 +2,7 @@ package watchlist
 
 import (
 	"context"
+	"strings"
 	"testing"
 
 	"mal/internal/db"
@@ -11,7 +12,15 @@ type fakeQuerier struct {
 	db.Querier
 	upsertAnimeCalled bool
 	upsertEntryCalled bool
-	addRows           []db.GetUserWatchListRow
+	upsertEntryParams db.UpsertWatchListEntryParams
+	getAnimeFunc      func(ctx context.Context, id int64) (db.Anime, error)
+}
+
+func (f *fakeQuerier) GetAnime(ctx context.Context, id int64) (db.Anime, error) {
+	if f.getAnimeFunc != nil {
+		return f.getAnimeFunc(ctx, id)
+	}
+	return db.Anime{}, nil
 }
 
 func (f *fakeQuerier) UpsertAnime(ctx context.Context, arg db.UpsertAnimeParams) (db.Anime, error) {
@@ -21,11 +30,12 @@ func (f *fakeQuerier) UpsertAnime(ctx context.Context, arg db.UpsertAnimeParams)
 
 func (f *fakeQuerier) UpsertWatchListEntry(ctx context.Context, arg db.UpsertWatchListEntryParams) (db.WatchListEntry, error) {
 	f.upsertEntryCalled = true
+	f.upsertEntryParams = arg
 	return db.WatchListEntry{}, nil
 }
 
 func (f *fakeQuerier) GetUserWatchList(ctx context.Context, userID string) ([]db.GetUserWatchListRow, error) {
-	return f.addRows, nil
+	return nil, nil
 }
 
 func TestAddEntry_RejectsInvalidAnimeID(t *testing.T) {
@@ -61,3 +71,31 @@ func TestAddEntry_RejectsInvalidStatus(t *testing.T) {
 		t.Fatal("expected no database writes for invalid status")
 	}
 }
+
+func TestImportWatchlist(t *testing.T) {
+	t.Parallel()
+
+	q := &fakeQuerier{}
+	svc := NewService(q, nil, nil)
+
+	csvData := `anime_id,status,current_episode,current_time_seconds
+1,watching,5,120.5
+2,invalid,10,0
+`
+	err := svc.ImportWatchlist(context.Background(), "user-1", strings.NewReader(csvData))
+	if err != nil {
+		t.Fatalf("ImportWatchlist failed: %v", err)
+	}
+
+	if !q.upsertEntryCalled {
+		t.Fatal("expected entries to be upserted")
+	}
+
+	// Verify the second record with invalid status was defaulted
+	// Note: We need a way to track all calls if we want to check the second record specifically,
+	// but the current fake only tracks the last call.
+	// For now, let's just check the last call which was record 2.
+	if q.upsertEntryParams.Status != "plan_to_watch" {
+		t.Errorf("expected status to be defaulted to plan_to_watch, got %s", q.upsertEntryParams.Status)
+	}
+}