package livekit

import (
	"context"
	"encoding/base64"
	"fmt"
	"slices"
	"testing"

	"github.com/dennwc/iters"
	"github.com/stretchr/testify/require"
	proto "google.golang.org/protobuf/proto"
	"gopkg.in/yaml.v3"
)

func TestUnmarshallRoomConfiguration(t *testing.T) {
	y := `
a:
  name: room_name
  egress:
    room:
      room_name: room_name
  agents:
    - {}
    - agent_name: ag
      metadata: mm
  min_playout_delay: 42
`

	obj := make(map[string]*RoomConfiguration)

	err := yaml.Unmarshal([]byte(y), &obj)
	require.NoError(t, err)
	require.Equal(t, 1, len(obj))

	re := obj["a"]
	require.NotNil(t, re)
	require.Equal(t, re.Name, "room_name")
	require.Equal(t, re.MinPlayoutDelay, uint32(42))
	require.Equal(t, re.Egress.Room.RoomName, "room_name")
	require.Equal(t, 2, len(re.Agents))
	require.Equal(t, "ag", re.Agents[1].AgentName)
	require.Equal(t, "mm", re.Agents[1].Metadata)

}

func TestMarshallRoomConfiguration(t *testing.T) {
	r := &RoomConfiguration{
		Name:             "name",
		MaxParticipants:  42,
		EmptyTimeout:     12,
		DepartureTimeout: 13,
		MinPlayoutDelay:  14,
		MaxPlayoutDelay:  15,
		Egress: &RoomEgress{
			Room: &RoomCompositeEgressRequest{
				AudioOnly: true,
				RoomName:  "room name",
			},
		},
		Agents: []*RoomAgentDispatch{
			{
				AgentName: "agent name",
			},
		},
	}

	b, err := yaml.Marshal(r)
	require.NoError(t, err)

	var ur RoomConfiguration
	err = yaml.Unmarshal(b, &ur)
	require.NoError(t, err)
	require.True(t, proto.Equal(r, &ur))
}

func TestUnmarshallRoomEgress(t *testing.T) {
	y := `
a:
  room:
    room_name: room name
b:
  participant:
    file_outputs:
        - s3:
            access_key: key
`

	obj := make(map[string]*RoomEgress)

	err := yaml.Unmarshal([]byte(y), &obj)
	require.NoError(t, err)
	require.Equal(t, 2, len(obj))

	re := obj["a"]
	require.NotNil(t, re)
	require.Equal(t, re.Room.RoomName, "room name")

	re = obj["b"]
	require.NotNil(t, re)
	require.Equal(t, 1, len(re.Participant.FileOutputs))
	require.Equal(t, "key", re.Participant.FileOutputs[0].Output.(*EncodedFileOutput_S3).S3.AccessKey)
}

func TestMarshallRoomEgress(t *testing.T) {
	e := &RoomEgress{
		Room: &RoomCompositeEgressRequest{
			AudioOnly: true,
			RoomName:  "room name",
		},
	}

	b, err := yaml.Marshal(e)
	require.NoError(t, err)

	var ue RoomEgress
	err = yaml.Unmarshal(b, &ue)
	require.NoError(t, err)
	require.True(t, proto.Equal(e, &ue))
}

func TestUnmarshallRoomAgent(t *testing.T) {
	y := `
a:
  dispatches:
    - {}
    - agent_name: ag
      metadata: mm
`
	obj := make(map[string]*RoomAgent)

	err := yaml.Unmarshal([]byte(y), &obj)
	require.NoError(t, err)
	require.Equal(t, 1, len(obj))

	re := obj["a"]
	require.NotNil(t, re)
	require.Equal(t, len(re.Dispatches), 2)
	require.Equal(t, "ag", re.Dispatches[1].AgentName)
	require.Equal(t, "mm", re.Dispatches[1].Metadata)
}

func TestMarshallRoomAgent(t *testing.T) {
	a := &RoomAgent{
		Dispatches: []*RoomAgentDispatch{
			&RoomAgentDispatch{
				AgentName: "agent name",
			},
		},
	}

	b, err := yaml.Marshal(a)
	require.NoError(t, err)

	var ua RoomAgent
	err = yaml.Unmarshal(b, &ua)
	require.NoError(t, err)
	require.True(t, proto.Equal(a, &ua))
}

var _ PageItem = testPageItem("")

type testPageItem string

func (t testPageItem) ID() string {
	return string(t)
}

type testPageReq struct {
	Page        *Pagination
	ReturnEmpty bool
}

func (t *testPageReq) GetPage() *Pagination {
	return t.Page
}

func (t *testPageReq) Filter(v testPageItem) bool {
	return true
}

type testPageResp []testPageItem

func (t testPageResp) GetItems() []testPageItem {
	return t
}

func TestListPageIter(t *testing.T) {
	const page = 3
	var (
		all []testPageItem
	)
	for i := 0; i < 10; i++ {
		all = append(all, testPageItem(fmt.Sprintf("%03d", i)))
	}
	pageFunc := func(ctx context.Context, req *testPageReq) (testPageResp, error) {
		limit := -1
		if req.Page != nil {
			limit = int(req.Page.Limit)
			if limit == 0 {
				limit = page
			}
		}
		if req.ReturnEmpty {
			return make(testPageResp, page), nil
		}
		var out testPageResp
		for _, v := range all {
			if req.Filter(v) && req.Page.Filter(v) {
				out = append(out, v)
				if limit > 0 && len(out) >= limit {
					break
				}
			}
		}
		return out, nil
	}
	exp := all
	testList := func(t testing.TB, req *testPageReq) {
		it := ListPageIter(pageFunc, req)

		got, err := iters.AllPages(context.Background(), it)
		require.NoError(t, err)
		require.Equal(t, exp, got)
	}
	t.Run("legacy", func(t *testing.T) {
		testList(t, &testPageReq{})
	})
	t.Run("pagination", func(t *testing.T) {
		testList(t, &testPageReq{Page: &Pagination{}})
	})
	t.Run("limit", func(t *testing.T) {
		testList(t, &testPageReq{Page: &Pagination{Limit: 5}})
	})
	t.Run("no ids", func(t *testing.T) {
		it := ListPageIter(pageFunc, &testPageReq{Page: &Pagination{}, ReturnEmpty: true})

		got, err := iters.AllPages(context.Background(), it)
		require.NoError(t, err)
		require.Equal(t, []testPageItem(nil), got)
	})
}

func TestListUpdate(t *testing.T) {
	var cases = []struct {
		Name   string
		Arr    []string
		Update *ListUpdate
		Exp    []string
		Err    bool
	}{
		{
			Name:   "empty update",
			Update: &ListUpdate{},
			Err:    true,
		},
		{
			Name:   "clear and set",
			Update: &ListUpdate{Clear: true, Set: []string{"a"}},
			Err:    true,
		},
		{
			Name:   "clear and add",
			Update: &ListUpdate{Clear: true, Add: []string{"a"}},
			Err:    true,
		},
		{
			Name:   "set and add",
			Update: &ListUpdate{Set: []string{"a"}, Add: []string{"b"}},
			Err:    true,
		},
		{
			Name:   "set and remove",
			Update: &ListUpdate{Set: []string{"a"}, Remove: []string{"b"}},
			Err:    true,
		},
		{
			Name:   "clear",
			Arr:    []string{"a", "b"},
			Update: &ListUpdate{Clear: true},
			Exp:    nil,
		},
		{
			Name:   "set",
			Arr:    []string{"a"},
			Update: &ListUpdate{Set: []string{"b"}},
			Exp:    []string{"b"},
		},
		{
			Name:   "add",
			Arr:    []string{"a", "b"},
			Update: &ListUpdate{Add: []string{"b", "c"}},
			Exp:    []string{"a", "b", "c"},
		},
		{
			Name:   "remove",
			Arr:    []string{"a", "b"},
			Update: &ListUpdate{Remove: []string{"b", "c"}},
			Exp:    []string{"a"},
		},
		{
			Name:   "add and remove",
			Arr:    []string{"a", "b", "c"},
			Update: &ListUpdate{Add: []string{"b", "d"}, Remove: []string{"c", "e"}},
			Exp:    []string{"a", "b", "d"},
		},
	}

	for _, c := range cases {
		t.Run(c.Name, func(t *testing.T) {
			prev := slices.Clone(c.Arr)
			out, err := c.Update.Apply(c.Arr)
			if c.Err {
				require.Error(t, err)
				return
			}
			require.NoError(t, err)
			require.Equal(t, c.Exp, out)
			require.Equal(t, prev, c.Arr)
		})
	}
}

func TestEncodeTokenPagination(t *testing.T) {
	t.Run("encode and decode", func(t *testing.T) {
		offset := int32(10)
		limit := int32(50)

		tokenPagination, err := EncodeTokenPagination(offset, limit)
		require.NoError(t, err)
		require.NotNil(t, tokenPagination)
		require.NotEmpty(t, tokenPagination.Token)

		decodedOffset, decodedLimit, err := DecodeTokenPagination(tokenPagination)
		require.NoError(t, err)
		require.Equal(t, offset, decodedOffset)
		require.Equal(t, limit, decodedLimit)
	})

	t.Run("encode zero values", func(t *testing.T) {
		tokenPagination, err := EncodeTokenPagination(0, 0)
		require.NoError(t, err)
		require.NotNil(t, tokenPagination)
		require.NotEmpty(t, tokenPagination.Token)

		decodedOffset, decodedLimit, err := DecodeTokenPagination(tokenPagination)
		require.NoError(t, err)
		require.Equal(t, int32(0), decodedOffset)
		require.Equal(t, int32(0), decodedLimit)
	})

	t.Run("decode nil token pagination", func(t *testing.T) {
		offset, limit, err := DecodeTokenPagination(nil)
		require.NoError(t, err)
		require.Equal(t, int32(0), offset)
		require.Equal(t, int32(0), limit)
	})

	t.Run("decode empty token", func(t *testing.T) {
		tp := &TokenPagination{Token: ""}
		offset, limit, err := DecodeTokenPagination(tp)
		require.NoError(t, err)
		require.Equal(t, int32(0), offset)
		require.Equal(t, int32(0), limit)
	})

	t.Run("decode invalid token", func(t *testing.T) {
		tp := &TokenPagination{Token: "invalid-token"}
		_, _, err := DecodeTokenPagination(tp)
		require.Error(t, err)
		require.Contains(t, err.Error(), "failed to decode token")
	})

	t.Run("decode invalid json", func(t *testing.T) {
		invalidJSON := base64.URLEncoding.EncodeToString([]byte("not json"))
		tp := &TokenPagination{Token: invalidJSON}
		_, _, err := DecodeTokenPagination(tp)
		require.Error(t, err)
		require.Contains(t, err.Error(), "failed to unmarshal")
	})
}