package client

import (
	"context"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/gorilla/websocket"
	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
	"github.com/nspcc-dev/neo-go/pkg/rpc/request"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/stretchr/testify/require"
)

func TestWSClientClose(t *testing.T) {
	srv := initTestServer(t, "")
	defer srv.Close()
	wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
	require.NoError(t, err)
	wsc.Close()
}

func TestWSClientSubscription(t *testing.T) {
	var cases = map[string]func(*WSClient) (string, error){
		"blocks": (*WSClient).SubscribeForNewBlocks,
		"transactions": func(wsc *WSClient) (string, error) {
			return wsc.SubscribeForNewTransactions(nil)
		},
		"notifications": func(wsc *WSClient) (string, error) {
			return wsc.SubscribeForExecutionNotifications(nil)
		},
		"executions": func(wsc *WSClient) (string, error) {
			return wsc.SubscribeForTransactionExecutions(nil)
		},
	}
	t.Run("good", func(t *testing.T) {
		for name, f := range cases {
			t.Run(name, func(t *testing.T) {
				srv := initTestServer(t, `{"jsonrpc": "2.0", "id": 1, "result": "55aaff00"}`)
				defer srv.Close()
				wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
				require.NoError(t, err)
				id, err := f(wsc)
				require.NoError(t, err)
				require.Equal(t, "55aaff00", id)
			})
		}
	})
	t.Run("bad", func(t *testing.T) {
		for name, f := range cases {
			t.Run(name, func(t *testing.T) {
				srv := initTestServer(t, `{"jsonrpc": "2.0", "id": 1, "error":{"code":-32602,"message":"Invalid Params"}}`)
				defer srv.Close()
				wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
				require.NoError(t, err)
				_, err = f(wsc)
				require.Error(t, err)
			})
		}
	})
}

func TestWSClientUnsubscription(t *testing.T) {
	type responseCheck struct {
		response string
		code     func(*testing.T, *WSClient)
	}
	var cases = map[string]responseCheck{
		"good": {`{"jsonrpc": "2.0", "id": 1, "result": true}`, func(t *testing.T, wsc *WSClient) {
			// We can't really subscribe using this stub server, so set up wsc internals.
			wsc.subscriptions["0"] = true
			err := wsc.Unsubscribe("0")
			require.NoError(t, err)
		}},
		"all": {`{"jsonrpc": "2.0", "id": 1, "result": true}`, func(t *testing.T, wsc *WSClient) {
			// We can't really subscribe using this stub server, so set up wsc internals.
			wsc.subscriptions["0"] = true
			err := wsc.UnsubscribeAll()
			require.NoError(t, err)
			require.Equal(t, 0, len(wsc.subscriptions))
		}},
		"not subscribed": {`{"jsonrpc": "2.0", "id": 1, "result": true}`, func(t *testing.T, wsc *WSClient) {
			err := wsc.Unsubscribe("0")
			require.Error(t, err)
		}},
		"error returned": {`{"jsonrpc": "2.0", "id": 1, "error":{"code":-32602,"message":"Invalid Params"}}`, func(t *testing.T, wsc *WSClient) {
			// We can't really subscribe using this stub server, so set up wsc internals.
			wsc.subscriptions["0"] = true
			err := wsc.Unsubscribe("0")
			require.Error(t, err)
		}},
		"false returned": {`{"jsonrpc": "2.0", "id": 1, "result": false}`, func(t *testing.T, wsc *WSClient) {
			// We can't really subscribe using this stub server, so set up wsc internals.
			wsc.subscriptions["0"] = true
			err := wsc.Unsubscribe("0")
			require.Error(t, err)
		}},
	}
	for name, rc := range cases {
		t.Run(name, func(t *testing.T) {
			srv := initTestServer(t, rc.response)
			defer srv.Close()
			wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
			require.NoError(t, err)
			rc.code(t, wsc)
		})
	}
}

func TestWSClientEvents(t *testing.T) {
	var ok bool
	// Events from RPC server test chain.
	var events = []string{
		`{"jsonrpc":"2.0","method":"transaction_executed","params":[{"txid":"0x93670859cc8a42f6ea994869c944879678d33d7501d388f5a446a8c7de147df7","executions":[{"trigger":"Application","contract":"0x0000000000000000000000000000000000000000","vmstate":"HALT","gas_consumed":"1.048","stack":[{"type":"Integer","value":"1"}],"notifications":[{"contract":"0xc2789e5ab9bab828743833965b1df0d5fbcc206f","state":{"type":"Array","value":[{"type":"ByteArray","value":"636f6e74726163742063616c6c"},{"type":"ByteArray","value":"507574"},{"type":"Array","value":[{"type":"ByteArray","value":"746573746b6579"},{"type":"ByteArray","value":"7465737476616c7565"}]}]}}]}]}]}`,
		`{"jsonrpc":"2.0","method":"notification_from_execution","params":[{"contract":"0xc2789e5ab9bab828743833965b1df0d5fbcc206f","state":{"type":"Array","value":[{"type":"ByteArray","value":"636f6e74726163742063616c6c"},{"type":"ByteArray","value":"507574"},{"type":"Array","value":[{"type":"ByteArray","value":"746573746b6579"},{"type":"ByteArray","value":"7465737476616c7565"}]}]}}]}`,
		`{"jsonrpc":"2.0","method":"transaction_added","params":[{"txid":"0x93670859cc8a42f6ea994869c944879678d33d7501d388f5a446a8c7de147df7","size":60,"type":"InvocationTransaction","version":1,"attributes":[],"vin":[],"vout":[],"scripts":[],"script":"097465737476616c756507746573746b657952c103507574676f20ccfbd5f01d5b9633387428b8bab95a9e78c2"}]}`,
		`{"jsonrpc":"2.0","method":"block_added","params":[{"version":0,"previousblockhash":"0x33f3e0e24542b2ec3b6420e6881c31f6460a39a4e733d88f7557cbcc3b5ed560","merkleroot":"0x9d922c5cfd4c8cd1da7a6b2265061998dc438bd0dea7145192e2858155e6c57a","time":1586154525,"height":205,"nonce":1111,"next_consensus":"0xa21e4f7178607089e4fe9fab1300d1f5a3d348be","script":{"invocation":"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","verification":"532102103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e2102a7bc55fe8684e0119768d104ba30795bdcc86619e864add26156723ed185cd622102b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc22103d90c07df63e690ce77912e10ab51acc944b66860237b608c4f8f8309e71ee69954ae"},"tx":[{"txid":"0xf9adfde059810f37b3d0686d67f6b29034e0c669537df7e59b40c14a0508b9ed","size":10,"type":"MinerTransaction","version":0,"attributes":[],"vin":[],"vout":[],"scripts":[]},{"txid":"0x93670859cc8a42f6ea994869c944879678d33d7501d388f5a446a8c7de147df7","size":60,"type":"InvocationTransaction","version":1,"attributes":[],"vin":[],"vout":[],"scripts":[],"script":"097465737476616c756507746573746b657952c103507574676f20ccfbd5f01d5b9633387428b8bab95a9e78c2"}]}]}`,
		`{"jsonrpc":"2.0","method":"event_missed","params":[]}`,
	}
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		if req.URL.Path == "/ws" && req.Method == "GET" {
			var upgrader = websocket.Upgrader{}
			ws, err := upgrader.Upgrade(w, req, nil)
			require.NoError(t, err)
			for _, event := range events {
				ws.SetWriteDeadline(time.Now().Add(2 * time.Second))
				err = ws.WriteMessage(1, []byte(event))
				if err != nil {
					break
				}
			}
			ws.Close()
			return
		}
	}))

	wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
	require.NoError(t, err)
	for range events {
		select {
		case _, ok = <-wsc.Notifications:
		case <-time.After(time.Second):
			t.Fatal("timeout waiting for event")
		}
		require.Equal(t, true, ok)
	}
	select {
	case _, ok = <-wsc.Notifications:
	case <-time.After(time.Second):
		t.Fatal("timeout waiting for event")
	}
	// Connection closed by server.
	require.Equal(t, false, ok)
}

func TestWSExecutionVMStateCheck(t *testing.T) {
	// Will answer successfully if request slips through.
	srv := initTestServer(t, `{"jsonrpc": "2.0", "id": 1, "result": "55aaff00"}`)
	defer srv.Close()
	wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
	require.NoError(t, err)
	filter := "NONE"
	_, err = wsc.SubscribeForTransactionExecutions(&filter)
	require.Error(t, err)
	wsc.Close()
}

func TestWSFilteredSubscriptions(t *testing.T) {
	var cases = []struct {
		name       string
		clientCode func(*testing.T, *WSClient)
		serverCode func(*testing.T, *request.Params)
	}{
		{"transactions",
			func(t *testing.T, wsc *WSClient) {
				tt := transaction.InvocationType
				_, err := wsc.SubscribeForNewTransactions(&tt)
				require.NoError(t, err)
			},
			func(t *testing.T, p *request.Params) {
				param, ok := p.Value(1)
				require.Equal(t, true, ok)
				require.Equal(t, request.TxFilterT, param.Type)
				filt, ok := param.Value.(request.TxFilter)
				require.Equal(t, true, ok)
				require.Equal(t, transaction.InvocationType, filt.Type)
			},
		},
		{"notifications",
			func(t *testing.T, wsc *WSClient) {
				contract := util.Uint160{1, 2, 3, 4, 5}
				_, err := wsc.SubscribeForExecutionNotifications(&contract)
				require.NoError(t, err)
			},
			func(t *testing.T, p *request.Params) {
				param, ok := p.Value(1)
				require.Equal(t, true, ok)
				require.Equal(t, request.NotificationFilterT, param.Type)
				filt, ok := param.Value.(request.NotificationFilter)
				require.Equal(t, true, ok)
				require.Equal(t, util.Uint160{1, 2, 3, 4, 5}, filt.Contract)
			},
		},
		{"executions",
			func(t *testing.T, wsc *WSClient) {
				state := "FAULT"
				_, err := wsc.SubscribeForTransactionExecutions(&state)
				require.NoError(t, err)
			},
			func(t *testing.T, p *request.Params) {
				param, ok := p.Value(1)
				require.Equal(t, true, ok)
				require.Equal(t, request.ExecutionFilterT, param.Type)
				filt, ok := param.Value.(request.ExecutionFilter)
				require.Equal(t, true, ok)
				require.Equal(t, "FAULT", filt.State)
			},
		},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
				if req.URL.Path == "/ws" && req.Method == "GET" {
					var upgrader = websocket.Upgrader{}
					ws, err := upgrader.Upgrade(w, req, nil)
					require.NoError(t, err)
					ws.SetReadDeadline(time.Now().Add(2 * time.Second))
					req := request.In{}
					err = ws.ReadJSON(&req)
					require.NoError(t, err)
					params, err := req.Params()
					require.NoError(t, err)
					c.serverCode(t, params)
					ws.SetWriteDeadline(time.Now().Add(2 * time.Second))
					err = ws.WriteMessage(1, []byte(`{"jsonrpc": "2.0", "id": 1, "result": "0"}`))
					require.NoError(t, err)
					ws.Close()
				}
			}))
			defer srv.Close()
			wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
			require.NoError(t, err)
			c.clientCode(t, wsc)
			wsc.Close()
		})
	}
}