package agentapi

import (
	"context"
	"encoding/json"
	"fmt"
)

// CrashGuardState mirrors the agent's GET /host/crash-guard (R-856, `09` §3 decision 143): what the
// host's crash guard (`felhom-crash-guard`, `11` §5.9) recorded about the most recent HOST boot. The
// agent reads /var/lib/felhom-crash-guard/state.json (0644) and passes these fields through.
//
// Present=false: the host has no crash guard or no state yet. An agent that predates the route answers
// 404 (a *StatusError) — both mean UNKNOWN, and the controller then keeps its normal boot grace.
type CrashGuardState struct {
	Present         bool   `json:"present"`
	LastBootAt      string `json:"last_boot_at,omitempty"` // RFC3339 UTC ("2006-01-02T15:04:05Z")
	LastBootUnclean bool   `json:"last_boot_unclean"`
	Tripped         bool   `json:"tripped"`
}

// CrashGuard calls GET /host/crash-guard.
func (c *Client) CrashGuard(ctx context.Context) (CrashGuardState, error) {
	var out CrashGuardState
	body, err := c.get(ctx, "/host/crash-guard")
	if err != nil {
		return out, err
	}
	if err := json.Unmarshal(body, &out); err != nil {
		return out, fmt.Errorf("agentapi: decode /host/crash-guard: %w", err)
	}
	return out, nil
}