package webhook

import (
	"context"
	"io"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"github.com/noderunners/nip05api/internal/db"
)

func setupRepo(t *testing.T) *Repo {
	t.Helper()
	d, err := db.Open(filepath.Join(t.TempDir(), "test.db"))
	if err != nil {
		t.Fatal(err)
	}
	if err := d.Migrate(context.Background()); err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { d.Close() })
	return NewRepo(d)
}

func TestWorker_DeliversAndMarksDelivered(t *testing.T) {
	repo := setupRepo(t)
	var (
		mu       sync.Mutex
		hits     int32
		gotSig   string
		gotEvent string
	)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		atomic.AddInt32(&hits, 1)
		mu.Lock()
		gotSig = r.Header.Get("X-Webhook-Signature")
		gotEvent = r.Header.Get("X-Webhook-Event")
		mu.Unlock()
		_, _ = io.Copy(io.Discard, r.Body)
		w.WriteHeader(http.StatusNoContent)
	}))
	t.Cleanup(srv.Close)

	svc := NewService(repo, "test.local", true)
	if err := svc.Enqueue(context.Background(), EventUserPaid, map[string]any{"username": "alice"}); err != nil {
		t.Fatal(err)
	}

	w := &Worker{
		repo:       repo,
		url:        srv.URL,
		secret:     "topsecret",
		timeout:    2 * time.Second,
		maxRetries: 5,
		hc:         &http.Client{Timeout: 2 * time.Second},
	}
	w.tick(context.Background())

	if atomic.LoadInt32(&hits) == 0 {
		t.Fatal("webhook never received")
	}
	mu.Lock()
	defer mu.Unlock()
	if gotEvent != "user.paid" {
		t.Errorf("event header: %q", gotEvent)
	}
	if len(gotSig) != 64 {
		t.Errorf("signature header: %q", gotSig)
	}

	// Row should be marked delivered.
	var status string
	if err := repo.db.QueryRowContext(context.Background(),
		`SELECT status FROM webhook_outbox LIMIT 1`).Scan(&status); err != nil {
		t.Fatal(err)
	}
	if status != string(StatusDelivered) {
		t.Errorf("expected delivered, got %s", status)
	}
}

func TestWorker_RetriesOn5xx(t *testing.T) {
	repo := setupRepo(t)
	var hits int32
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		atomic.AddInt32(&hits, 1)
		_, _ = io.Copy(io.Discard, r.Body)
		w.WriteHeader(http.StatusInternalServerError)
	}))
	t.Cleanup(srv.Close)

	svc := NewService(repo, "test.local", true)
	if err := svc.Enqueue(context.Background(), EventUserAdded, map[string]any{}); err != nil {
		t.Fatal(err)
	}

	// First attempt fires immediately (next_attempt_at = now).
	w := &Worker{
		repo:       repo,
		url:        srv.URL,
		timeout:    1 * time.Second,
		maxRetries: 5,
		hc:         &http.Client{Timeout: 1 * time.Second},
	}

	w.tick(context.Background())

	if atomic.LoadInt32(&hits) != 1 {
		t.Fatalf("expected 1 attempt, got %d", hits)
	}

	// Verify row updated with attempts=1, status still pending.
	rows, err := repo.Claim(context.Background(), 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(rows) != 0 {
		t.Errorf("row should not be claimable yet (next_attempt_at in future), got %d", len(rows))
	}

	var attempts int
	if err := repo.db.QueryRowContext(context.Background(),
		`SELECT attempts FROM webhook_outbox LIMIT 1`).Scan(&attempts); err != nil {
		t.Fatal(err)
	}
	if attempts != 1 {
		t.Errorf("expected attempts=1, got %d", attempts)
	}
}

func TestWorker_DeadAfterMaxRetries(t *testing.T) {
	repo := setupRepo(t)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
	}))
	t.Cleanup(srv.Close)

	svc := NewService(repo, "test.local", true)
	_ = svc.Enqueue(context.Background(), EventUserAdded, map[string]any{})

	w := &Worker{
		repo:       repo,
		url:        srv.URL,
		timeout:    1 * time.Second,
		maxRetries: 2,
		hc:         &http.Client{Timeout: 1 * time.Second},
	}
	// First failure → retry scheduled.
	w.tick(context.Background())
	// Force the row eligible again by rewinding next_attempt_at.
	if _, err := repo.db.ExecContext(context.Background(),
		`UPDATE webhook_outbox SET next_attempt_at = ?`,
		time.Now().UTC().Format(time.RFC3339)); err != nil {
		t.Fatal(err)
	}
	w.tick(context.Background())

	var status string
	if err := repo.db.QueryRowContext(context.Background(),
		`SELECT status FROM webhook_outbox LIMIT 1`).Scan(&status); err != nil {
		t.Fatal(err)
	}
	if status != string(StatusDead) {
		t.Errorf("expected dead after 2 attempts, got %s", status)
	}
}

func TestWorker_NoURL_NoOp(t *testing.T) {
	repo := setupRepo(t)
	w := NewWorker(repo, "", "", 5, 5)
	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
	defer cancel()
	w.Run(ctx) // returns when ctx fires; should not hang.
}