package checker

import (
	"context"
	"fmt"
	"strings"

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

type ruleTargetsResolve struct{}

func RuleTargetsResolve() sdk.CheckRule { return &ruleTargetsResolve{} }
func (ruleTargetsResolve) Name() string { return "srv_targets_resolve" }
func (ruleTargetsResolve) Description() string {
	return "Every SRV target resolves to at least one A/AAAA address."
}
func (ruleTargetsResolve) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
	d, cs := getData(ctx, obs)
	if cs != nil {
		return []sdk.CheckState{*cs}
	}
	var failed []string
	var checked int
	for _, r := range d.Records {
		if r.IsNullTarget {
			continue
		}
		checked++
		if len(r.Addresses) == 0 {
			failed = append(failed, fmt.Sprintf("%s (%s)", r.Target, r.ResolveError))
		}
	}
	if checked == 0 {
		return []sdk.CheckState{{Status: sdk.StatusUnknown, Code: "srv_no_targets",
			Message: "No resolvable targets to test."}}
	}
	if len(failed) == 0 {
		return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_all_resolve",
			Message: fmt.Sprintf("All %d target(s) resolve.", checked)}}
	}
	return []sdk.CheckState{{Status: sdk.StatusCrit, Code: "srv_resolve_fail",
		Message: fmt.Sprintf("Target(s) failed DNS resolution: %s", strings.Join(failed, "; "))}}
}