package checker

import (
	"context"

	sdk "git.happydns.org/checker-sdk-go/checker"
)

// simpleConcernRule is the common shape for "load SMTPData, derive the
// issues, keep only those whose Code matches one of `codes`, and emit
// either the matching states or a single pass state".
type simpleConcernRule struct {
	name        string
	description string
	codes       []string
	passCode    string
	passMessage string
}

func (r *simpleConcernRule) Name() string        { return r.name }
func (r *simpleConcernRule) Description() string { return r.description }

func (r *simpleConcernRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
	data, errSt := loadSMTPData(ctx, obs)
	if errSt != nil {
		return []sdk.CheckState{*errSt}
	}
	// Null-MX declares the domain does not accept mail; every other rule
	// becomes vacuous. Return "not tested" so those lines do not count as
	// a pass or fail in the aggregator.
	if data.MX.NullMX {
		return []sdk.CheckState{notTestedState(r.name+".skipped", "Skipped: domain declares a null MX (refuses mail).")}
	}
	issues := issuesByCodes(data, r.codes...)
	if len(issues) == 0 {
		return []sdk.CheckState{passState(r.passCode, r.passMessage)}
	}
	return statesFromIssues(issues)
}