package port_test

import (
	"cmp"
	"fmt"
	"net/http"
	"net/http/httptest"
	"slices"
	"strconv"
	"strings"
	"testing"

	"gitea.dwysokinski.me/twhelp/corev3/internal/domain"
	"gitea.dwysokinski.me/twhelp/corev3/internal/domain/domaintest"
	"gitea.dwysokinski.me/twhelp/corev3/internal/port/internal/apimodel"
	"github.com/brianvoe/gofakeit/v6"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

const endpointListServers = "/v2/versions/%s/servers"

func TestListServers(t *testing.T) {
	t.Parallel()

	handler := newAPIHTTPHandler(t)
	servers := getAllServers(t, handler)
	version := servers[0].Version

	tests := []struct {
		name        string
		reqModifier func(t *testing.T, req *http.Request)
		assertResp  func(t *testing.T, req *http.Request, resp *http.Response)
	}{
		{
			name: "OK: without params",
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ListServersResponse](t, resp.Body)
				assert.Zero(t, body.Cursor.Next)
				assert.NotZero(t, body.Cursor.Self)
				assert.NotZero(t, body.Data)
				assert.True(t, slices.IsSortedFunc(body.Data, func(a, b apimodel.Server) int {
					if a.Open && !b.Open {
						return -1
					}

					if !a.Open && b.Open {
						return 1
					}

					return cmp.Compare(a.Key, b.Key)
				}))
			},
		},
		{
			name: "OK: limit=1",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("limit", "1")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ListServersResponse](t, resp.Body)
				assert.NotZero(t, body.Cursor.Next)
				assert.NotZero(t, body.Cursor.Self)
				assert.NotZero(t, body.Data)
				limit, err := strconv.Atoi(req.URL.Query().Get("limit"))
				require.NoError(t, err)
				assert.Len(t, body.Data, limit)
			},
		},
		{
			name: "OK: limit=1 cursor",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()

				q := req.URL.Query()
				q.Set("limit", "1")
				req.URL.RawQuery = q.Encode()

				resp := doCustomRequest(handler, req.Clone(req.Context()))
				defer resp.Body.Close()
				body := decodeJSON[apimodel.ListServersResponse](t, resp.Body)
				require.NotEmpty(t, body.Cursor.Next)

				q.Set("cursor", body.Cursor.Next)
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ListVersionsResponse](t, resp.Body)
				assert.Equal(t, req.URL.Query().Get("cursor"), body.Cursor.Self)
				limit, err := strconv.Atoi(req.URL.Query().Get("limit"))
				require.NoError(t, err)
				assert.Len(t, body.Data, limit)
			},
		},
		{
			name: "OK: open=false",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("open", "false")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ListServersResponse](t, resp.Body)
				assert.NotZero(t, body.Data)
				for _, s := range body.Data {
					assert.False(t, s.Open)
				}
			},
		},
		{
			name: "OK: open=true",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("open", "true")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ListServersResponse](t, resp.Body)
				assert.NotZero(t, body.Data)
				for _, s := range body.Data {
					assert.True(t, s.Open)
				}
			},
		},
		{
			name: "ERR: limit is not a string",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("limit", "asd")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code: "invalid-param-format",
							Message: fmt.Sprintf(
								"error binding string parameter: strconv.ParseInt: parsing \"%s\": invalid syntax",
								req.URL.Query().Get("limit"),
							),
							Path: []string{"$query", "limit"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: limit < 1",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("limit", "0")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				limit, err := strconv.Atoi(req.URL.Query().Get("limit"))
				require.NoError(t, err)
				domainErr := domain.MinGreaterEqualError{
					Min:     1,
					Current: limit,
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"current": float64(domainErr.Current),
								"min":     float64(domainErr.Min),
							},
							Path: []string{"$query", "limit"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: limit > 500",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("limit", "501")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				limit, err := strconv.Atoi(req.URL.Query().Get("limit"))
				require.NoError(t, err)
				domainErr := domain.MaxLessEqualError{
					Max:     500,
					Current: limit,
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"current": float64(domainErr.Current),
								"max":     float64(domainErr.Max),
							},
							Path: []string{"$query", "limit"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: len(cursor) < 1",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("cursor", "")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				domainErr := domain.LenOutOfRangeError{
					Min:     1,
					Max:     1000,
					Current: len(req.URL.Query().Get("cursor")),
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"current": float64(domainErr.Current),
								"max":     float64(domainErr.Max),
								"min":     float64(domainErr.Min),
							},
							Path: []string{"$query", "cursor"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: len(cursor) > 1000",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("cursor", gofakeit.LetterN(1001))
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				domainErr := domain.LenOutOfRangeError{
					Min:     1,
					Max:     1000,
					Current: len(req.URL.Query().Get("cursor")),
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"current": float64(domainErr.Current),
								"max":     float64(domainErr.Max),
								"min":     float64(domainErr.Min),
							},
							Path: []string{"$query", "cursor"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: invalid cursor",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("cursor", gofakeit.LetterN(100))
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				var domainErr domain.Error
				require.ErrorAs(t, domain.ErrInvalidCursor, &domainErr)
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Path:    []string{"$query", "cursor"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: open is not a valid boolean",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				q := req.URL.Query()
				q.Set("open", "asd")
				req.URL.RawQuery = q.Encode()
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code: "invalid-param-format",
							Message: fmt.Sprintf(
								"error binding string parameter: strconv.ParseBool: parsing \"%s\": invalid syntax",
								req.URL.Query().Get("open"),
							),
							Path: []string{"$query", "open"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: version not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointListServers, domaintest.RandVersionCode())
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 5)
				domainErr := domain.VersionNotFoundError{
					VersionCode: pathSegments[3],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"code": domainErr.VersionCode,
							},
						},
					},
				}, body)
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			req := httptest.NewRequest(
				http.MethodGet,
				fmt.Sprintf(endpointListServers, version.Code),
				nil,
			)
			if tt.reqModifier != nil {
				tt.reqModifier(t, req)
			}

			resp := doCustomRequest(handler, req)
			defer resp.Body.Close()
			tt.assertResp(t, req, resp)
		})
	}
}

const endpointGetServer = "/v2/versions/%s/servers/%s"

func TestGetServer(t *testing.T) {
	t.Parallel()

	handler := newAPIHTTPHandler(t)
	server := randServer(t, handler)

	tests := []struct {
		name        string
		reqModifier func(t *testing.T, req *http.Request)
		assertResp  func(t *testing.T, req *http.Request, resp *http.Response)
	}{
		{
			name: "OK",
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.GetServerResponse](t, resp.Body)
				assert.Equal(t, server.Server, body.Data)
			},
		},
		{
			name: "ERR: len(serverKey) > 10",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServer, server.Version.Code, gofakeit.LetterN(11))
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 6)
				domainErr := domain.LenOutOfRangeError{
					Min:     1,
					Max:     10,
					Current: len(pathSegments[5]),
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"min":     float64(domainErr.Min),
								"max":     float64(domainErr.Max),
								"current": float64(domainErr.Current),
							},
							Path: []string{"$path", "serverKey"},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: version not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServer, domaintest.RandVersionCode(), server.Key)
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 6)
				domainErr := domain.VersionNotFoundError{
					VersionCode: pathSegments[3],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"code": domainErr.VersionCode,
							},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: server not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServer, server.Version.Code, domaintest.RandServerKey())
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 6)
				domainErr := domain.ServerNotFoundError{
					Key: pathSegments[5],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"key": domainErr.Key,
							},
						},
					},
				}, body)
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			req := httptest.NewRequest(http.MethodGet, fmt.Sprintf(endpointGetServer, server.Version.Code, server.Key), nil)
			if tt.reqModifier != nil {
				tt.reqModifier(t, req)
			}

			resp := doCustomRequest(handler, req)
			defer resp.Body.Close()
			tt.assertResp(t, req, resp)
		})
	}
}

const endpointGetServerConfig = "/v2/versions/%s/servers/%s/config"

func TestGetServerConfig(t *testing.T) {
	t.Parallel()

	handler := newAPIHTTPHandler(t)
	server := randServer(t, handler)

	tests := []struct {
		name        string
		reqModifier func(t *testing.T, req *http.Request)
		assertResp  func(t *testing.T, req *http.Request, resp *http.Response)
	}{
		{
			name: "OK",
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)
				body := decodeJSON[apimodel.GetServerConfigResponse](t, resp.Body)
				assert.Empty(t, body)
			},
		},
		{
			name: "ERR: version not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServerConfig, domaintest.RandVersionCode(), server.Key)
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 7)
				domainErr := domain.VersionNotFoundError{
					VersionCode: pathSegments[3],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"code": domainErr.VersionCode,
							},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: server not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServerConfig, server.Version.Code, domaintest.RandServerKey())
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 7)
				domainErr := domain.ServerNotFoundError{
					Key: pathSegments[5],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"key": domainErr.Key,
							},
						},
					},
				}, body)
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			req := httptest.NewRequest(
				http.MethodGet,
				fmt.Sprintf(endpointGetServerConfig, server.Version.Code, server.Key),
				nil,
			)
			if tt.reqModifier != nil {
				tt.reqModifier(t, req)
			}

			resp := doCustomRequest(handler, req)
			defer resp.Body.Close()
			tt.assertResp(t, req, resp)
		})
	}
}

const endpointGetServerUnitInfo = "/v2/versions/%s/servers/%s/unit-info"

func TestGetServerUnitInfo(t *testing.T) {
	t.Parallel()

	handler := newAPIHTTPHandler(t)
	server := randServer(t, handler)

	tests := []struct {
		name        string
		reqModifier func(t *testing.T, req *http.Request)
		assertResp  func(t *testing.T, req *http.Request, resp *http.Response)
	}{
		{
			name: "OK",
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)
				body := decodeJSON[apimodel.GetUnitInfoResponse](t, resp.Body)
				assert.Empty(t, body)
			},
		},
		{
			name: "ERR: version not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServerUnitInfo, domaintest.RandVersionCode(), server.Key)
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 7)
				domainErr := domain.VersionNotFoundError{
					VersionCode: pathSegments[3],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"code": domainErr.VersionCode,
							},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: server not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServerUnitInfo, server.Version.Code, domaintest.RandServerKey())
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 7)
				domainErr := domain.ServerNotFoundError{
					Key: pathSegments[5],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"key": domainErr.Key,
							},
						},
					},
				}, body)
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			req := httptest.NewRequest(
				http.MethodGet,
				fmt.Sprintf(endpointGetServerUnitInfo, server.Version.Code, server.Key),
				nil,
			)
			if tt.reqModifier != nil {
				tt.reqModifier(t, req)
			}

			resp := doCustomRequest(handler, req)
			defer resp.Body.Close()
			tt.assertResp(t, req, resp)
		})
	}
}

const endpointGetServerBuildingInfo = "/v2/versions/%s/servers/%s/building-info"

func TestGetServerBuildingInfo(t *testing.T) {
	t.Parallel()

	handler := newAPIHTTPHandler(t)
	server := randServer(t, handler)

	tests := []struct {
		name        string
		reqModifier func(t *testing.T, req *http.Request)
		assertResp  func(t *testing.T, req *http.Request, resp *http.Response)
	}{
		{
			name: "OK",
			assertResp: func(t *testing.T, _ *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusOK, resp.StatusCode)
				body := decodeJSON[apimodel.GetBuildingInfoResponse](t, resp.Body)
				assert.Empty(t, body)
			},
		},
		{
			name: "ERR: version not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServerBuildingInfo, domaintest.RandVersionCode(), server.Key)
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 7)
				domainErr := domain.VersionNotFoundError{
					VersionCode: pathSegments[3],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"code": domainErr.VersionCode,
							},
						},
					},
				}, body)
			},
		},
		{
			name: "ERR: server not found",
			reqModifier: func(t *testing.T, req *http.Request) {
				t.Helper()
				req.URL.Path = fmt.Sprintf(endpointGetServerBuildingInfo, server.Version.Code, domaintest.RandServerKey())
			},
			assertResp: func(t *testing.T, req *http.Request, resp *http.Response) {
				t.Helper()

				assert.Equal(t, http.StatusNotFound, resp.StatusCode)

				// body
				body := decodeJSON[apimodel.ErrorResponse](t, resp.Body)
				pathSegments := strings.Split(req.URL.Path, "/")
				require.Len(t, pathSegments, 7)
				domainErr := domain.ServerNotFoundError{
					Key: pathSegments[5],
				}
				assert.Equal(t, apimodel.ErrorResponse{
					Errors: []apimodel.Error{
						{
							Code:    domainErr.Code(),
							Message: domainErr.Error(),
							Params: map[string]any{
								"key": domainErr.Key,
							},
						},
					},
				}, body)
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			req := httptest.NewRequest(
				http.MethodGet,
				fmt.Sprintf(endpointGetServerBuildingInfo, server.Version.Code, server.Key),
				nil,
			)
			if tt.reqModifier != nil {
				tt.reqModifier(t, req)
			}

			resp := doCustomRequest(handler, req)
			defer resp.Body.Close()
			tt.assertResp(t, req, resp)
		})
	}
}

type serverWithVersion struct {
	apimodel.Server
	Version apimodel.Version
}

func getAllServers(tb testing.TB, h http.Handler) []serverWithVersion {
	tb.Helper()

	respVersions := doRequest(h, http.MethodGet, endpointListVersions, nil)
	defer respVersions.Body.Close()
	require.Equal(tb, http.StatusOK, respVersions.StatusCode)
	bodyVersions := decodeJSON[apimodel.ListVersionsResponse](tb, respVersions.Body)
	require.NotEmpty(tb, bodyVersions.Data)

	var servers []serverWithVersion

	for _, v := range bodyVersions.Data {
		respServers := doRequest(h, http.MethodGet, fmt.Sprintf(endpointListServers, v.Code), nil)
		require.Equal(tb, http.StatusOK, respServers.StatusCode)

		bodyServers := decodeJSON[apimodel.ListServersResponse](tb, respServers.Body)
		for _, s := range bodyServers.Data {
			servers = append(servers, serverWithVersion{
				Server:  s,
				Version: v,
			})
		}

		_ = respServers.Body.Close()
	}

	require.NotZero(tb, servers)

	return servers
}

func randServer(tb testing.TB, h http.Handler) serverWithVersion {
	tb.Helper()
	servers := getAllServers(tb, h)
	return servers[gofakeit.IntRange(0, len(servers)-1)]
}