package notify

import (
	"encoding/json"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"
)

func TestWebhookNotifier_Success(t *testing.T) {
	var received Event
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		body, _ := io.ReadAll(r.Body)
		json.Unmarshal(body, &received)
		w.WriteHeader(http.StatusOK)
	}))
	defer server.Close()

	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	notifier := NewWebhookNotifier(server.URL, logger)

	event := Event{
		TaskID:   "t-1",
		TaskName: "Test",
		Status:   "COMPLETED",
		CostUSD:  0.50,
		Duration: "2m30s",
	}

	if err := notifier.Notify(event); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if received.TaskID != "t-1" {
		t.Errorf("task_id: want 't-1', got %q", received.TaskID)
	}
	if received.CostUSD != 0.50 {
		t.Errorf("cost: want 0.50, got %f", received.CostUSD)
	}
}

func TestWebhookNotifier_ServerError(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
	}))
	defer server.Close()

	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	notifier := NewWebhookNotifier(server.URL, logger)

	err := notifier.Notify(Event{TaskID: "t-1", Status: "COMPLETED"})
	if err == nil {
		t.Fatal("expected error for 500 response")
	}
}

func TestMultiNotifier_FansOut(t *testing.T) {
	var count int
	counter := &countingNotifier{count: &count}
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	multi := NewMultiNotifier(logger, counter, counter, counter)

	multi.Notify(Event{TaskID: "t-1"})
	if count != 3 {
		t.Errorf("want 3 notifications, got %d", count)
	}
}

func TestLogNotifier_NoError(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	notifier := &LogNotifier{Logger: logger}
	if err := notifier.Notify(Event{TaskID: "t-1", Status: "COMPLETED"}); err != nil {
		t.Errorf("unexpected error: %v", err)
	}
}

type countingNotifier struct {
	count *int
}

func (c *countingNotifier) Notify(_ Event) error {
	*c.count++
	return nil
}