// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

package model

import (
	"bytes"
	"encoding/json"
	"io"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestWebSocketEvent(t *testing.T) {
	userId := NewId()
	m := NewWebSocketEvent("some_event", NewId(), NewId(), userId, nil, "")
	m.Add("RootId", NewId())
	user := &User{
		Id: userId,
	}
	m.Add("user", user)
	json, err := m.ToJSON()
	require.NoError(t, err)

	result, err := WebSocketEventFromJSON(bytes.NewReader(json))
	require.NoError(t, err)

	require.True(t, m.IsValid(), "should be valid")
	require.Equal(t, m.GetBroadcast().TeamId, result.GetBroadcast().TeamId, "Team ids do not match")
	require.Equal(t, m.GetData()["RootId"], result.GetData()["RootId"], "Root ids do not match")
	require.Equal(t, m.GetData()["user"].(*User).Id, result.GetData()["user"].(*User).Id, "User ids do not match")
}

func TestWebSocketEventImmutable(t *testing.T) {
	m := NewWebSocketEvent("some_event", NewId(), NewId(), NewId(), nil, "")

	new := m.SetEvent("new_event")
	if new == m {
		require.Fail(t, "pointers should not be the same")
	}
	require.NotEqual(t, m.EventType(), new.EventType())
	require.Equal(t, new.EventType(), "new_event")

	new = m.SetSequence(45)
	if new == m {
		require.Fail(t, "pointers should not be the same")
	}
	require.NotEqual(t, m.GetSequence(), new.GetSequence())
	require.Equal(t, new.GetSequence(), int64(45))

	broadcast := &WebsocketBroadcast{}
	new = m.SetBroadcast(broadcast)
	if new == m {
		require.Fail(t, "pointers should not be the same")
	}
	require.NotEqual(t, m.GetBroadcast(), new.GetBroadcast())
	require.Equal(t, new.GetBroadcast(), broadcast)

	data := map[string]any{
		"key":  "val",
		"key2": "val2",
	}
	new = m.SetData(data)
	if new == m {
		require.Fail(t, "pointers should not be the same")
	}
	require.NotEqual(t, m, new)
	require.Equal(t, new.data, data)
	require.Equal(t, new.data, new.GetData())

	copy := m.Copy()
	if copy == m {
		require.Fail(t, "pointers should not be the same")
	}
	require.Equal(t, m, copy)
}

func TestWebSocketEventFromJSON(t *testing.T) {
	ev, err := WebSocketEventFromJSON(bytes.NewReader([]byte("junk")))
	require.Error(t, err)
	require.Nil(t, ev, "should not have parsed")
	data := []byte(`{"event": "test", "data": {"key": "val"}, "seq": 45, "broadcast": {"user_id": "userid"}}`)
	ev, err = WebSocketEventFromJSON(bytes.NewReader(data))
	require.NoError(t, err)
	require.NotNil(t, ev, "should have parsed")
	require.Equal(t, ev.EventType(), "test")
	require.Equal(t, ev.GetSequence(), int64(45))
	require.Equal(t, ev.data, map[string]any{"key": "val"})
	require.Equal(t, ev.GetBroadcast(), &WebsocketBroadcast{UserId: "userid"})
}

func TestWebSocketResponse(t *testing.T) {
	m := NewWebSocketResponse("OK", 1, map[string]any{})
	e := NewWebSocketError(1, &AppError{})
	m.Add("RootId", NewId())
	json, err := m.ToJSON()
	require.NoError(t, err)
	result, err := WebSocketResponseFromJSON(bytes.NewReader(json))
	require.NoError(t, err)
	json2, err := e.ToJSON()
	require.NoError(t, err)
	WebSocketResponseFromJSON(bytes.NewReader(json2))

	badresult, err := WebSocketResponseFromJSON(bytes.NewReader([]byte("junk")))
	require.Error(t, err)
	require.Nil(t, badresult, "should not have parsed")

	require.True(t, m.IsValid(), "should be valid")

	require.Equal(t, m.Data["RootId"], result.Data["RootId"], "Ids do not match")
}

func TestWebSocketEvent_PrecomputeJSON(t *testing.T) {
	event := NewWebSocketEvent(WebsocketEventPosted, "foo", "bar", "baz", nil, "")
	event = event.SetSequence(7)

	before, err := event.ToJSON()
	require.NoError(t, err)
	event.PrecomputeJSON()
	after, err := event.ToJSON()
	require.NoError(t, err)

	assert.Equal(t, before, after)
}

var stringSink []byte

func BenchmarkWebSocketEvent_ToJSON(b *testing.B) {
	event := NewWebSocketEvent(WebsocketEventPosted, "foo", "bar", "baz", nil, "")
	for i := 0; i < 100; i++ {
		event.GetData()[NewId()] = NewId()
	}

	b.Run("SerializedNTimes", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			stringSink, _ = event.ToJSON()
		}
	})

	b.Run("PrecomputedNTimes", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			event.PrecomputeJSON()
		}
	})

	b.Run("PrecomputedAndSerializedNTimes", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			event.PrecomputeJSON()
			stringSink, _ = event.ToJSON()
		}
	})

	event.PrecomputeJSON()
	b.Run("PrecomputedOnceAndSerializedNTimes", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			stringSink, _ = event.ToJSON()
		}
	})
}

func TestWebsocketBroadcastCopy(t *testing.T) {
	w := &WebsocketBroadcast{}
	require.Equal(t, w, w.copy())

	w = nil
	require.Equal(t, w, w.copy())

	w = &WebsocketBroadcast{
		OmitUsers: map[string]bool{
			"aaa": true,
			"bbb": true,
			"ccc": false,
		},
		UserId:                "aaa",
		ChannelId:             "bbb",
		TeamId:                "ccc",
		ContainsSanitizedData: true,
		ContainsSensitiveData: true,
	}
	require.Equal(t, w, w.copy())
}

func TestPrecomputedWebSocketEventJSONCopy(t *testing.T) {
	p := &precomputedWebSocketEventJSON{}
	require.Equal(t, p, p.copy())

	p = nil
	require.Equal(t, p, p.copy())

	p = &precomputedWebSocketEventJSON{
		Event:     []byte{},
		Data:      []byte{},
		Broadcast: []byte{},
	}
	require.Equal(t, p, p.copy())

	p = &precomputedWebSocketEventJSON{
		Event:     []byte{'a', 'b', 'c'},
		Data:      []byte{'d', 'e', 'f'},
		Broadcast: []byte{'g', 'h', 'i'},
	}
	require.Equal(t, p, p.copy())
}

func TestWebSocketEventDeepCopy(t *testing.T) {
	omitUsers := map[string]bool{
		"user1": true,
		"user2": false,
	}

	broadcast := &WebsocketBroadcast{
		OmitUsers:             omitUsers,
		UserId:                "aaa",
		ChannelId:             "bbb",
		TeamId:                "ccc",
		ContainsSanitizedData: true,
		ContainsSensitiveData: true,
		OmitConnectionId:      "ddd",
	}

	ev := NewWebSocketEvent("test", "team", "channel", "user", omitUsers, "ddd")

	ev.Add("post", &Post{})
	ev.SetBroadcast(broadcast)
	ev = ev.PrecomputeJSON()

	evCopy := ev.DeepCopy()
	require.Equal(t, ev, evCopy)
	require.NotSame(t, ev.data, evCopy.data)
	require.NotSame(t, ev.broadcast, evCopy.broadcast)
	require.NotSame(t, ev.precomputedJSON, evCopy.precomputedJSON)

	ev.Add("post", &Post{
		Id: "test",
	})
	require.NotEqual(t, ev.data, evCopy.data)
}

var err error

func BenchmarkEncodeJSON(b *testing.B) {
	message := NewWebSocketEvent(WebsocketEventUserAdded, "", "channelID", "", nil, "")
	message.Add("user_id", "userID")
	message.Add("team_id", "teamID")

	ev := message.PrecomputeJSON()

	enc := json.NewEncoder(io.Discard)
	for i := 0; i < b.N; i++ {
		err = ev.Encode(enc)
	}
}