package api

import (
	"net/http"

	"geniusrun/backend/internal/store"
)

// handleReclassifyAll re-runs the rule engine for every activity except
// those that are locked:
//   - a manual assignment is the user's definitive word and is never
//     overwritten by the rule engine again;
//   - an activity already assigned to Race is locked too, since that
//     classification comes from a hard Garmin fact (eventType.typeKey ==
//     "race"), not a rule the user might retune -- there's nothing to
//     re-derive.
//
// It's a synchronous, bounded operation (unlike sync), so it runs inline
// rather than in the background.
func (s *Server) handleReclassifyAll(w http.ResponseWriter, r *http.Request) {
	raceKind, hasRaceKind, err := s.DB.GetWorkoutKindByName(r.Context(), "Race")
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	assignments, err := s.DB.AllCurrentAssignments(r.Context())
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	var activityIDs []int64
	for _, a := range assignments {
		if a.AssignmentSource == store.AssignmentSourceManual {
			continue
		}
		if hasRaceKind && a.WorkoutKindID != nil && *a.WorkoutKindID == raceKind.ID {
			continue
		}
		activityIDs = append(activityIDs, a.ActivityID)
	}

	for _, activityID := range activityIDs {
		if err := s.Sync.ClassifyActivity(r.Context(), activityID); err != nil {
			writeError(w, http.StatusInternalServerError, err.Error())
			return
		}
	}
	writeJSON(w, http.StatusOK, map[string]int{"reclassified": len(activityIDs)})
}