package ws

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync/atomic"
	"testing"
	"time"

	"github.com/gorilla/websocket"
)

func TestSessionConfigUpperBounds(t *testing.T) {
	for _, c := range []SessionConfig{{MaxMessageBytes: 1<<30 + 1}, {ReadQueueSize: 65537}, {WriteQueueSize: 65537}, {ReadQueueBytes: 1<<30 + 1}, {WriteQueueBytes: 1<<30 + 1}, {CloseTimeout: 25 * time.Hour}} {
		if c.Validate() == nil {
			t.Fatal("oversized config accepted")
		}
	}
}

func TestClientReconnectsRemoteGoingAway(t *testing.T) {
	var handshakes atomic.Int32
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		conn, err := (&websocket.Upgrader{}).Upgrade(w, r, nil)
		if err != nil {
			return
		}
		defer conn.Close()
		if handshakes.Add(1) == 1 {
			_ = conn.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(1001, ""), time.Now().Add(time.Second))
		}
		for {
			if _, _, err = conn.ReadMessage(); err != nil {
				return
			}
		}
	}))
	defer server.Close()
	client, err := NewClient(ClientConfig{ProxyMode: "direct", Reconnect: ReconnectConfig{Enabled: true, MinBackoff: time.Millisecond, MaxBackoff: time.Millisecond}})
	if err != nil {
		t.Fatal(err)
	}
	defer func() {
		ctx, cancel := context.WithTimeout(context.Background(), time.Second)
		defer cancel()
		if err := client.Shutdown(ctx); err != nil {
			t.Error(err)
		}
	}()
	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()
	connected := make(chan struct{}, 1)
	done := make(chan error, 1)
	go func() {
		done <- client.Run(ctx, "ws"+strings.TrimPrefix(server.URL, "http"), Handlers{OnOpen: func(context.Context, *Session) error {
			if handshakes.Load() >= 2 {
				connected <- struct{}{}
			}
			return nil
		}})
	}()
	select {
	case <-connected:
	case err := <-done:
		t.Fatalf("Run ended before reconnect: %v", err)
	case <-ctx.Done():
		t.Fatal(ctx.Err())
	}
	_ = client.Close()
	select {
	case err := <-done:
		if err != nil {
			t.Fatal(err)
		}
	case <-ctx.Done():
		t.Fatal(ctx.Err())
	}
	if stats := client.Stats(); stats.DialAttempts != 2 || stats.Reconnects != 1 || stats.HandshakeFailures != 0 {
		t.Fatal(stats)
	}
}

func TestClientHandshakeStats(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { http.Error(w, "denied", http.StatusUnauthorized) }))
	defer server.Close()
	client, err := NewClient(ClientConfig{ProxyMode: "direct"})
	if err != nil {
		t.Fatal(err)
	}
	defer client.Close()
	_, err = client.Dial(context.Background(), "ws"+strings.TrimPrefix(server.URL, "http"), Handlers{})
	if err == nil {
		t.Fatal("expected rejection")
	}
	if stats := client.Stats(); stats.DialAttempts != 1 || stats.HandshakeFailures != 1 || stats.Reconnects != 0 {
		t.Fatal(stats)
	}
}