package checker

import (
	"fmt"

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

// Evaluate turns an AliasData into one CheckState per finding. When the run
// produced no findings, it returns a single StatusOK state describing the
// healthy alias.
func Evaluate(data *AliasData) []sdk.CheckState {
	if len(data.Findings) == 0 {
		msg := fmt.Sprintf("Alias chain for %s is healthy", data.Owner)
		if data.FinalTarget != "" && data.FinalTarget != data.Owner {
			msg = fmt.Sprintf("%s → %s resolves cleanly", data.Owner, data.FinalTarget)
		}
		return []sdk.CheckState{{
			Status:  sdk.StatusOK,
			Message: msg,
			Subject: data.Owner,
			Meta: map[string]any{
				"owner":        data.Owner,
				"apex":         data.Apex,
				"final_target": data.FinalTarget,
				"final_a":      data.FinalA,
				"final_aaaa":   data.FinalAAAA,
				"chain_length": len(data.Chain),
			},
		}}
	}

	out := make([]sdk.CheckState, 0, len(data.Findings))
	for _, f := range data.Findings {
		subject := f.Subject
		if subject == "" {
			subject = data.Owner
		}
		state := sdk.CheckState{
			Status:  severityToStatus(f.Severity),
			Code:    f.Code,
			Message: f.Message,
			Subject: subject,
		}
		if f.Hint != "" {
			state.Meta = map[string]any{"hint": f.Hint}
		}
		out = append(out, state)
	}
	return out
}

func severityToStatus(s Severity) sdk.Status {
	switch s {
	case SeverityCrit:
		return sdk.StatusCrit
	case SeverityWarn:
		return sdk.StatusWarn
	case SeverityInfo:
		return sdk.StatusInfo
	}
	return sdk.StatusOK
}