package domain

import (
	"errors"
	"git.cin.su/m/Assistant/contracts/epistemics"
	"git.cin.su/m/Assistant/platform/ids"
	"strings"
)

var ErrInvalidKnowledge = errors.New("invalid epistemic knowledge record")

func ValidateProposition(value epistemics.Proposition) error {
	if value.ID == "" || value.Kind == "" || strings.TrimSpace(value.SubjectRef) == "" || (value.ObjectValue == "" && value.ObjectRef == "" && value.TextFallback == "") {
		return ErrInvalidKnowledge
	}
	return nil
}

func ValidateBeliefAssessment(value epistemics.BeliefAssessment) error {
	if value.ID == "" || value.ClaimID == "" || !value.Revision.Valid() || value.State == "" || value.ConfidenceMillis < 0 || value.ConfidenceMillis > 1000 || value.AssessedAtUnixMillis < 1 {
		return ErrInvalidKnowledge
	}
	return nil
}

func NewBeliefAssessment(claim epistemics.ClaimID, confidence int64, state epistemics.BeliefAssessmentState, evidence []epistemics.EvidenceRef, at int64) (epistemics.BeliefAssessment, error) {
	id, err := ids.New()
	if err != nil {
		return epistemics.BeliefAssessment{}, err
	}
	value := epistemics.BeliefAssessment{ID: id, ClaimID: claim, Revision: ids.InitialRevision, State: state, ConfidenceMillis: confidence, EvidenceRefs: append([]epistemics.EvidenceRef(nil), evidence...), AssessedAtUnixMillis: at}
	if err := ValidateBeliefAssessment(value); err != nil {
		return epistemics.BeliefAssessment{}, err
	}
	return value, nil
}