package app

import (
	"strings"
	"time"
)

func buildTransportHealthResponse(it TransportClient, now time.Time) TransportClientHealthResponse {
	health := it.Health
	if strings.TrimSpace(health.LastCheck) == "" {
		if strings.TrimSpace(it.UpdatedAt) != "" {
			health.LastCheck = it.UpdatedAt
		} else {
			health.LastCheck = now.Format(time.RFC3339)
		}
	}
	if strings.TrimSpace(health.LastError) == "" {
		health.LastError = strings.TrimSpace(it.Runtime.LastError.Message)
	}
	rt := transportRuntimeSnapshot(it, now)
	code := ""
	if it.Status == TransportClientDegraded || strings.TrimSpace(health.LastError) != "" {
		code = "TRANSPORT_CLIENT_DEGRADED"
	}
	return TransportClientHealthResponse{
		OK:       true,
		Message:  "ok",
		Code:     code,
		ClientID: it.ID,
		Kind:     it.Kind,
		Status:   it.Status,
		Latency:  health.LatencyMS,
		LastErr:  health.LastError,
		Health:   health,
		Runtime:  rt,
	}
}

func buildTransportMetricsResponse(it TransportClient, now time.Time) TransportClientMetricsResponse {
	rt := transportRuntimeSnapshot(it, now)
	return TransportClientMetricsResponse{
		OK:       true,
		Message:  "ok",
		ClientID: it.ID,
		Kind:     it.Kind,
		Status:   it.Status,
		Metrics:  rt.Metrics,
		Runtime:  rt,
	}
}

func applyTransportHealthProbeSnapshot(it TransportClient, backendID string, probe transportBackendHealthResult, now time.Time) TransportClient {
	snapshot := it
	ts := now.Format(time.RFC3339)
	if strings.TrimSpace(backendID) != "" {
		snapshot.Runtime.Backend = backendID
	}
	snapshot.Health.LastCheck = ts
	if probe.LatencyMS > 0 {
		snapshot.Health.LatencyMS = probe.LatencyMS
	}
	if probe.Status != "" {
		snapshot.Status = normalizeTransportStatus(probe.Status)
	}
	if probe.OK {
		if snapshot.Status != TransportClientDegraded {
			snapshot.Health.LastError = ""
		}
		snapshot.Runtime.LastError = TransportClientError{}
	} else {
		msg := strings.TrimSpace(probe.Message)
		if msg == "" {
			msg = "transport health probe failed"
		}
		snapshot.Health.LastError = msg
		snapshot.Runtime.LastError = TransportClientError{
			Code:      strings.TrimSpace(probe.Code),
			Message:   msg,
			Retryable: probe.Retryable,
			At:        ts,
		}
	}
	snapshot.Runtime = transportRuntimeSnapshot(snapshot, now)
	return snapshot
}