package version

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

	hashiVersion "github.com/anchore/go-version"
)

func TestIsUpdateAvailable(t *testing.T) {
	tests := []struct {
		name          string
		buildVersion  string
		latestVersion string
		code          int
		isAvailable   bool
		newVersion    string
		err           bool
	}{
		{
			name:          "equal",
			buildVersion:  "1.0.0",
			latestVersion: "1.0.0",
			code:          200,
			isAvailable:   false,
			newVersion:    "",
			err:           false,
		},
		{
			name:          "hasUpdate",
			buildVersion:  "1.0.0",
			latestVersion: "1.2.0",
			code:          200,
			isAvailable:   true,
			newVersion:    "1.2.0",
			err:           false,
		},
		{
			name:          "aheadOfLatest",
			buildVersion:  "1.2.0",
			latestVersion: "1.0.0",
			code:          200,
			isAvailable:   false,
			newVersion:    "",
			err:           false,
		},
		{
			name:          "EmptyUpdate",
			buildVersion:  "1.0.0",
			latestVersion: "",
			code:          200,
			isAvailable:   false,
			newVersion:    "",
			err:           true,
		},
		{
			name:          "GarbageUpdate",
			buildVersion:  "1.0.0",
			latestVersion: "hdfjksdhfhkj",
			code:          200,
			isAvailable:   false,
			newVersion:    "",
			err:           true,
		},
		{
			name:          "BadUpdate",
			buildVersion:  "1.0.0",
			latestVersion: "1.0.",
			code:          500,
			isAvailable:   false,
			newVersion:    "",
			err:           true,
		},
		{
			name:          "NoBuildVersion",
			buildVersion:  valueNotProvided,
			latestVersion: "1.0.0",
			code:          200,
			isAvailable:   false,
			newVersion:    "",
			err:           false,
		},
		{
			name:          "BadUpdateValidVersion",
			buildVersion:  "1.0.0",
			latestVersion: "2.0.0",
			code:          404,
			isAvailable:   false,
			newVersion:    "",
			err:           true,
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			// setup mocks
			// local...
			version = test.buildVersion
			// remote...
			handler := http.NewServeMux()
			handler.HandleFunc(latestAppVersionURL.path, func(w http.ResponseWriter, r *http.Request) {
				w.WriteHeader(test.code)
				_, _ = w.Write([]byte(test.latestVersion))
			})
			mockSrv := httptest.NewServer(handler)
			latestAppVersionURL.host = mockSrv.URL
			defer mockSrv.Close()

			isAvailable, newVersion, err := IsUpdateAvailable()
			if err != nil && !test.err {
				t.Fatalf("got error but expected none: %+v", err)
			} else if err == nil && test.err {
				t.Fatalf("expected error but got none")
			}

			if newVersion != test.newVersion {
				t.Errorf("unexpected NEW version: %+v", newVersion)
			}

			if isAvailable != test.isAvailable {
				t.Errorf("unexpected result: %+v", isAvailable)
			}
		})
	}

}

func TestFetchLatestApplicationVersion(t *testing.T) {
	tests := []struct {
		name     string
		response string
		code     int
		err      bool
		expected *hashiVersion.Version
	}{
		{
			name:     "gocase",
			response: "1.0.0",
			code:     200,
			expected: hashiVersion.Must(hashiVersion.NewVersion("1.0.0")),
		},
		{
			name:     "garbage",
			response: "garbage",
			code:     200,
			expected: nil,
			err:      true,
		},
		{
			name:     "http 500",
			response: "1.0.0",
			code:     500,
			expected: nil,
			err:      true,
		},
		{
			name:     "http 404",
			response: "1.0.0",
			code:     404,
			expected: nil,
			err:      true,
		},
		{
			name:     "empty",
			response: "",
			code:     200,
			expected: nil,
			err:      true,
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			// setup mock
			handler := http.NewServeMux()
			handler.HandleFunc(latestAppVersionURL.path, func(w http.ResponseWriter, r *http.Request) {
				w.WriteHeader(test.code)
				_, _ = w.Write([]byte(test.response))
			})
			mockSrv := httptest.NewServer(handler)
			latestAppVersionURL.host = mockSrv.URL
			defer mockSrv.Close()

			actual, err := fetchLatestApplicationVersion()
			if err != nil && !test.err {
				t.Fatalf("got error but expected none: %+v", err)
			} else if err == nil && test.err {
				t.Fatalf("expected error but got none")
			}

			if err != nil {
				return
			}

			if actual.String() != test.expected.String() {
				t.Errorf("unexpected version: %+v", actual.String())
			}
		})
	}

}