package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"
)

func cmdHealthcheck(_ []string) error {
	cfg, err := loadAndValidateConfig()
	if err != nil {
		return err
	}
	addrBytes, err := os.ReadFile(filepath.Join(cfg.DataDir, "listen.addr"))
	if err != nil {
		return fmt.Errorf("read listen.addr: %w", err)
	}
	addr := strings.TrimSpace(string(addrBytes))
	if addr == "" {
		return fmt.Errorf("listen.addr is empty")
	}
	url := "http://" + addr + "/healthz"
	client := &http.Client{Timeout: 5 * time.Second}
	resp, err := client.Get(url)
	if err != nil {
		return err
	}
	defer func() { _ = resp.Body.Close() }()
	body, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("healthz status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
	}
	return nil
}