refactor: split modules and harden scraping workflows

internal/repository/history_repository.go

@@ -0,0 +1,41 @@
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"gorm.io/gorm"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+)
+
+// HistoryRepository persists model.PlaybackHistory entries. The application
+// upserts on (UserID, MediaID) so resume always reads the latest position.
+type HistoryRepository struct{ db *gorm.DB }
+
+// Upsert atomically inserts/updates the resume position.
+func (r *HistoryRepository) Upsert(ctx context.Context, h *model.PlaybackHistory) error {
+	var existing model.PlaybackHistory
+	err := r.db.WithContext(ctx).
+		Where("user_id = ? AND media_id = ?", h.UserID, h.MediaID).
+		First(&existing).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return r.db.WithContext(ctx).Create(h).Error
+	}
+	if err != nil {
+		return err
+	}
+	existing.PositionMs = h.PositionMs
+	existing.DurationMs = h.DurationMs
+	existing.WatchedAt = h.WatchedAt
+	existing.Completed = h.Completed
+	return r.db.WithContext(ctx).Save(&existing).Error
+}
+
+// ListByUser returns the most recent history rows for the user.
+func (r *HistoryRepository) ListByUser(ctx context.Context, userID string, limit int) ([]model.PlaybackHistory, error) {
+	var rows []model.PlaybackHistory
+	err := r.db.WithContext(ctx).Where("user_id = ?", userID).
+		Order("watched_at desc").Limit(limit).Find(&rows).Error
+	return rows, err
+}