package ntfy

import (
	"bytes"
	"fmt"
	"log"
	"net/http"
	"time"
)

type Config struct {
	URL   string
	Topic string
}

// Notify sends a failure notification. Silently does nothing if
// URL or Topic are unset, so callers don't need to check first.
func Notify(cfg Config, context string, err error) {
	if cfg.URL == "" || cfg.Topic == "" {
		return
	}

	msg := fmt.Sprintf("%s: %v", context, err)
	url := fmt.Sprintf("%s/%s", cfg.URL, cfg.Topic)

	req, reqErr := http.NewRequest("POST", url, bytes.NewBufferString(msg))
	if reqErr != nil {
		log.Printf("ntfy request build failed: %v", reqErr)
		return
	}
	req.Header.Set("Title", "Varde Notification")
	req.Header.Set("Priority", "high")

	client := &http.Client{Timeout: 5 * time.Second}
	resp, sendErr := client.Do(req)
	if sendErr != nil {
		log.Printf("ntfy notification failed: %v", sendErr)
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode >= 300 {
		log.Printf("ntfy notification returned status %d", resp.StatusCode)
	}
}