package protosocket

import (
	"context"
	"io"
	"log/slog"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	toki "git.toki-labs.com/toki/proto-socket/go"
	"google.golang.org/protobuf/types/known/structpb"
	"nhooyr.io/websocket"
)

func TestServerAcceptsWebSocketAndClosesClients(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	srv := NewServer(Config{
		HeartbeatIntervalSec: 0,
		HeartbeatWaitSec:     0,
	}, logger)

	testServer := httptest.NewServer(srv)
	defer testServer.Close()

	wsURL := strings.Replace(testServer.URL, "http", "ws", 1)
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()

	conn, _, err := websocket.Dial(ctx, wsURL, nil)
	if err != nil {
		t.Fatalf("failed to dial websocket: %v", err)
	}
	defer conn.Close(websocket.StatusNormalClosure, "")

	client := toki.NewWsClient(conn, 0, 0, ParserMap())
	defer client.Close()

	if !client.IsAlive() {
		t.Error("client should be alive after connection")
	}

	disconnected := make(chan struct{}, 1)
	client.AddDisconnectListener(func(c *toki.WsClient) {
		disconnected <- struct{}{}
	})

	if err := srv.Close(); err != nil {
		t.Errorf("failed to close server: %v", err)
	}

	select {
	case <-disconnected:
		// success
	case <-time.After(1 * time.Second):
		t.Error("timed out waiting for client to disconnect after server close")
	}
}

func TestServerRespondsWithErrorEnvelopeForUnsupportedAction(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	srv := NewServer(Config{
		HeartbeatIntervalSec: 0,
		HeartbeatWaitSec:     0,
	}, logger)
	defer srv.Close()

	testServer := httptest.NewServer(srv)
	defer testServer.Close()

	wsURL := strings.Replace(testServer.URL, "http", "ws", 1)
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()

	conn, _, err := websocket.Dial(ctx, wsURL, nil)
	if err != nil {
		t.Fatalf("failed to dial websocket: %v", err)
	}
	defer conn.Close(websocket.StatusNormalClosure, "")

	client := toki.NewWsClient(conn, 0, 0, ParserMap())
	defer client.Close()

	requestEnv := Envelope{
		ProtocolVersion: ProtocolVersion,
		ID:              "req-999",
		Type:            "request",
		Channel:         "tasks",
		Action:          "invalid-unsupported-action",
	}
	reqStruct, err := requestEnv.ToStruct()
	if err != nil {
		t.Fatalf("failed to create request struct: %v", err)
	}

	resStruct, err := toki.SendRequestTyped[*structpb.Struct, *structpb.Struct](&client.Communicator, reqStruct, 1*time.Second)
	if err != nil {
		t.Fatalf("failed to send request: %v", err)
	}

	responseEnv, err := EnvelopeFromStruct(resStruct)
	if err != nil {
		t.Fatalf("failed to parse response struct: %v", err)
	}

	if responseEnv.Type != "error" {
		t.Errorf("expected response type 'error', got %q", responseEnv.Type)
	}
	if responseEnv.CorrelationID != "req-999" {
		t.Errorf("expected CorrelationID 'req-999', got %q", responseEnv.CorrelationID)
	}
	if responseEnv.Error == nil {
		t.Fatal("expected error in response env")
	}
	if responseEnv.Error.Code != "UNSUPPORTED_ACTION" {
		t.Errorf("expected error code 'UNSUPPORTED_ACTION', got %q", responseEnv.Error.Code)
	}
	if responseEnv.Error.Retryable {
		t.Error("expected Retryable to be false for UNSUPPORTED_ACTION")
	}
}

func TestServerHeartbeatConfigSupport(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(io.Discard, nil))

	srvZero := NewServer(Config{
		HeartbeatIntervalSec: 0,
		HeartbeatWaitSec:     0,
	}, logger)
	srvZero.Close()

	srvNonZero := NewServer(Config{
		HeartbeatIntervalSec: 10,
		HeartbeatWaitSec:     2,
	}, logger)
	srvNonZero.Close()
}