// Package rules holds the generic automation-rule model and condition
// evaluation logic. Nothing here knows about growboxes, lights, or pumps —
// only sensor_type/operator/value, exactly as stored in automation_rules.
package rules

import "fmt"

// Rule mirrors one row of automation_rules, joined against devices so the
// device IDs are the external identifiers used by MQTT/Redis/gRPC (not
// PostgreSQL's internal bigserial IDs).
type Rule struct {
	ID                  int64
	ZoneID              int64
	SourceDeviceID      string // condition_source_device_id, resolved to devices.external_id
	ConditionSensorType string
	ConditionOperator   string
	ConditionValue      float64
	TargetDeviceID      string // target_device_id, resolved to devices.external_id
	ActionType          string
	ActionParams        map[string]any
}

// Evaluate reports whether value satisfies the rule's condition.
func Evaluate(operator string, value, threshold float64) (bool, error) {
	switch operator {
	case ">":
		return value > threshold, nil
	case "<":
		return value < threshold, nil
	case ">=":
		return value >= threshold, nil
	case "<=":
		return value <= threshold, nil
	case "=":
		return value == threshold, nil
	case "!=":
		return value != threshold, nil
	default:
		return false, fmt.Errorf("unknown condition operator %q", operator)
	}
}