package birdfmt

import (
	"context"
	"os"
	"strings"
)

// LocalBirdStatus is returned by GET /v1/bird/status (same host as birdc when socket is configured).
type LocalBirdStatus struct {
	BirdcConfigured  bool   `json:"birdc_configured"`
	Message          string `json:"message,omitempty"`
	Error            string `json:"error,omitempty"`
	ProtocolsExcerpt string `json:"protocols_excerpt,omitempty"`
	BGPSessionsTotal int    `json:"bgp_sessions_total"`
	BGPEstablished   int    `json:"bgp_established"`
	// Healthy: null if birdc not configured; false if birdc failed or BGP sessions exist but none Established; true otherwise.
	Healthy *bool `json:"healthy"`
}

// InspectLocalBird runs `birdc show protocols all` using EVOBGP_BIRDC_SOCKET / EVOBGP_BIRDC_BIN.
func InspectLocalBird(ctx context.Context) LocalBirdStatus {
	sock := strings.TrimSpace(os.Getenv("EVOBGP_BIRDC_SOCKET"))
	if sock == "" {
		return LocalBirdStatus{
			BirdcConfigured: false,
			Message:         "EVOBGP_BIRDC_SOCKET не задан на этом процессе — статус BIRD недоступен (типично, если birdc только на ноде со спикером).",
			Healthy:         nil,
		}
	}
	bin := strings.TrimSpace(os.Getenv("EVOBGP_BIRDC_BIN"))
	out, err := ShowProtocols(ctx, sock, bin)
	if err != nil {
		f := false
		return LocalBirdStatus{
			BirdcConfigured: true,
			Error:           err.Error(),
			Healthy:         &f,
		}
	}
	sum := SummarizeProtocolsOutput(out)
	excerpt := out
	const maxExcerpt = 20000
	if len(excerpt) > maxExcerpt {
		excerpt = excerpt[:maxExcerpt] + "\n# … truncated …\n"
	}
	ok := sum.BGPSessionsTotal == 0 || sum.BGPEstablished > 0
	return LocalBirdStatus{
		BirdcConfigured:  true,
		ProtocolsExcerpt: excerpt,
		BGPSessionsTotal: sum.BGPSessionsTotal,
		BGPEstablished:   sum.BGPEstablished,
		Healthy:          &ok,
	}
}