feat: extend equipment and workout models with service tracking

internal/equipment/model.go

@@ -3,17 +3,58 @@ package equipment
 import "time"
 
 type Equipment struct {
-	ID        uint      `gorm:"primaryKey" json:"id"`
-	UserID    uint      `gorm:"not null;index" json:"user_id"`
-	Name      string    `gorm:"not null" json:"name"`
-	Type      string    `gorm:"not null" json:"type"` // "bike", "shoes", "helmet", etc.
-	Brand     string    `gorm:"default:''" json:"brand"`
-	Model     string    `gorm:"default:''" json:"model"`
-	Weight    float64   `gorm:"default:0" json:"weight"` // grams
-	Notes     string    `gorm:"default:''" json:"notes"`
-	Active    bool      `gorm:"default:true" json:"active"`
-	CreatedAt time.Time `json:"created_at"`
-	UpdatedAt time.Time `json:"updated_at"`
+	ID                      uint       `gorm:"primaryKey" json:"id"`
+	UserID                  uint       `gorm:"not null;index" json:"user_id"`
+	Name                    string     `gorm:"not null" json:"name"`
+	Type                    string     `gorm:"not null" json:"type"` // "bike", "shoes", "helmet", etc.
+	Brand                   string     `gorm:"default:''" json:"brand"`
+	Model                   string     `gorm:"default:''" json:"model"`
+	Weight                  float64    `gorm:"default:0" json:"weight"` // grams
+	Notes                   string     `gorm:"default:''" json:"notes"`
+	Active                  bool       `gorm:"default:true" json:"active"`
+	TotalDistance            float64    `gorm:"default:0" json:"total_distance"`              // km
+	TotalDuration            int        `gorm:"default:0" json:"total_duration"`               // seconds
+	TotalRides               int        `gorm:"default:0" json:"total_rides"`
+	ServiceIntervalDistance  float64    `gorm:"default:0" json:"service_interval_distance"`    // km, 0 = no reminder
+	ServiceIntervalDuration  int        `gorm:"default:0" json:"service_interval_duration"`    // hours, 0 = no reminder
+	LastServiceDate          *time.Time `json:"last_service_date"`
+	DistanceSinceService     float64    `gorm:"default:0" json:"distance_since_service"`       // km since last service
+	DurationSinceService     int        `gorm:"default:0" json:"duration_since_service"`       // seconds since last service
+	CreatedAt                time.Time  `json:"created_at"`
+	UpdatedAt                time.Time  `json:"updated_at"`
+}
+
+// ServiceStatus indicates whether equipment needs servicing.
+type ServiceStatus struct {
+	NeedsService        bool    `json:"needs_service"`
+	DistanceDue         bool    `json:"distance_due"`
+	DurationDue         bool    `json:"duration_due"`
+	DistanceSinceService float64 `json:"distance_since_service"` // km
+	DurationSinceService int     `json:"duration_since_service"` // hours
+	ServiceIntervalDist  float64 `json:"service_interval_distance"`
+	ServiceIntervalDur   int     `json:"service_interval_duration"`
+}
+
+// GetServiceStatus checks if the equipment is due for service.
+func (e *Equipment) GetServiceStatus() ServiceStatus {
+	status := ServiceStatus{
+		DistanceSinceService: e.DistanceSinceService,
+		DurationSinceService: e.DurationSinceService / 3600,
+		ServiceIntervalDist:  e.ServiceIntervalDistance,
+		ServiceIntervalDur:   e.ServiceIntervalDuration,
+	}
+
+	if e.ServiceIntervalDistance > 0 && e.DistanceSinceService >= e.ServiceIntervalDistance {
+		status.DistanceDue = true
+		status.NeedsService = true
+	}
+
+	if e.ServiceIntervalDuration > 0 && e.DurationSinceService >= e.ServiceIntervalDuration*3600 {
+		status.DurationDue = true
+		status.NeedsService = true
+	}
+
+	return status
 }
 
 type TrainingZone struct {