package notify

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
)

// Webhook delivers notifications as a JSON POST of the Event to a
// project-configured URL. Config is {"url": "..."}. secret is currently
// unused (reserved for future request signing) and is never logged.
type Webhook struct {
	HTTP *http.Client
}

func (w *Webhook) Send(ctx context.Context, cfg json.RawMessage, secret string, ev Event) error {
	var c struct {
		URL string `json:"url"`
	}
	if err := json.Unmarshal(cfg, &c); err != nil {
		return err
	}
	body, err := json.Marshal(ev)
	if err != nil {
		return err
	}
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.URL, bytes.NewReader(body))
	if err != nil {
		return err
	}
	req.Header.Set("Content-Type", "application/json")
	resp, err := w.HTTP.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return fmt.Errorf("webhook: status %d", resp.StatusCode)
	}
	return nil
}