package rpcenc

import (
	"context"
	"io"
	"io/ioutil"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/gorilla/mux"
	"github.com/stretchr/testify/require"

	"github.com/filecoin-project/go-jsonrpc"
	sealing "github.com/filecoin-project/lotus/extern/storage-sealing"
)

type ReaderHandler struct {
}

func (h *ReaderHandler) ReadAll(ctx context.Context, r io.Reader) ([]byte, error) {
	return ioutil.ReadAll(r)
}

func (h *ReaderHandler) ReadNullLen(ctx context.Context, r io.Reader) (int64, error) {
	return r.(*sealing.NullReader).N, nil
}

func (h *ReaderHandler) ReadUrl(ctx context.Context, u string) (string, error) {
	return u, nil
}

func TestReaderProxy(t *testing.T) {
	var client struct {
		ReadAll func(ctx context.Context, r io.Reader) ([]byte, error)
	}

	serverHandler := &ReaderHandler{}

	readerHandler, readerServerOpt := ReaderParamDecoder()
	rpcServer := jsonrpc.NewServer(readerServerOpt)
	rpcServer.Register("ReaderHandler", serverHandler)

	mux := mux.NewRouter()
	mux.Handle("/rpc/v0", rpcServer)
	mux.Handle("/rpc/streams/v0/push/{uuid}", readerHandler)

	testServ := httptest.NewServer(mux)
	defer testServ.Close()

	re := ReaderParamEncoder("http://" + testServ.Listener.Addr().String() + "/rpc/streams/v0/push")
	closer, err := jsonrpc.NewMergeClient("ws://"+testServ.Listener.Addr().String()+"/rpc/v0", "ReaderHandler", []interface{}{&client}, nil, re)
	require.NoError(t, err)

	defer closer()

	read, err := client.ReadAll(context.TODO(), strings.NewReader("pooooootato"))
	require.NoError(t, err)
	require.Equal(t, "pooooootato", string(read), "potatoes weren't equal")
}

func TestNullReaderProxy(t *testing.T) {
	var client struct {
		ReadAll     func(ctx context.Context, r io.Reader) ([]byte, error)
		ReadNullLen func(ctx context.Context, r io.Reader) (int64, error)
	}

	serverHandler := &ReaderHandler{}

	readerHandler, readerServerOpt := ReaderParamDecoder()
	rpcServer := jsonrpc.NewServer(readerServerOpt)
	rpcServer.Register("ReaderHandler", serverHandler)

	mux := mux.NewRouter()
	mux.Handle("/rpc/v0", rpcServer)
	mux.Handle("/rpc/streams/v0/push/{uuid}", readerHandler)

	testServ := httptest.NewServer(mux)
	defer testServ.Close()

	re := ReaderParamEncoder("http://" + testServ.Listener.Addr().String() + "/rpc/streams/v0/push")
	closer, err := jsonrpc.NewMergeClient("ws://"+testServ.Listener.Addr().String()+"/rpc/v0", "ReaderHandler", []interface{}{&client}, nil, re)
	require.NoError(t, err)

	defer closer()

	n, err := client.ReadNullLen(context.TODO(), sealing.NewNullReader(1016))
	require.NoError(t, err)
	require.Equal(t, int64(1016), n)
}