package cli_test

import (
	"bytes"
	"flag"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"

	"github.com/spf13/cobra"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"golang.org/x/xerrors"

	"github.com/coder/coder/buildinfo"
	"github.com/coder/coder/cli"
	"github.com/coder/coder/cli/clitest"
	"github.com/coder/coder/codersdk"
	"github.com/coder/coder/testutil"
)

// To update the golden files:
// make update-golden-files
var updateGoldenFiles = flag.Bool("update", false, "update .golden files")

//nolint:tparallel,paralleltest // These test sets env vars.
func TestCommandHelp(t *testing.T) {
	commonEnv := map[string]string{
		"CODER_CONFIG_DIR": "/tmp/coder-cli-test-config",
	}

	type testCase struct {
		name string
		cmd  []string
		env  map[string]string
	}
	tests := []testCase{
		{
			name: "coder --help",
			cmd:  []string{"--help"},
		},
		{
			name: "coder server --help",
			cmd:  []string{"server", "--help"},
			env: map[string]string{
				"CODER_CACHE_DIRECTORY": "/tmp/coder-cli-test-cache",
			},
		},
		{
			name: "coder agent --help",
			cmd:  []string{"agent", "--help"},
			env: map[string]string{
				"CODER_AGENT_LOG_DIR": "/tmp",
			},
		},
	}

	root := cli.Root(cli.AGPL())
ExtractCommandPathsLoop:
	for _, cp := range extractVisibleCommandPaths(nil, root.Commands()) {
		name := fmt.Sprintf("coder %s --help", strings.Join(cp, " "))
		cmd := append(cp, "--help")
		for _, tt := range tests {
			if tt.name == name {
				continue ExtractCommandPathsLoop
			}
		}
		tests = append(tests, testCase{name: name, cmd: cmd})
	}

	wd, err := os.Getwd()
	require.NoError(t, err)
	if runtime.GOOS == "windows" {
		wd = strings.ReplaceAll(wd, "\\", "\\\\")
	}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			env := make(map[string]string)
			for k, v := range commonEnv {
				env[k] = v
			}
			for k, v := range tt.env {
				env[k] = v
			}

			// Unset all CODER_ environment variables for a clean slate.
			for _, kv := range os.Environ() {
				name := strings.Split(kv, "=")[0]
				if _, ok := env[name]; !ok && strings.HasPrefix(name, "CODER_") {
					t.Setenv(name, "")
				}
			}
			// Override environment variables for a reproducible test.
			for k, v := range env {
				t.Setenv(k, v)
			}

			ctx, _ := testutil.Context(t)

			var buf bytes.Buffer
			root, _ := clitest.New(t, tt.cmd...)
			root.SetOut(&buf)
			err := root.ExecuteContext(ctx)
			require.NoError(t, err)

			got := buf.Bytes()
			// Remove CRLF newlines (Windows).
			got = bytes.ReplaceAll(got, []byte{'\r', '\n'}, []byte{'\n'})

			// The `coder templates create --help` command prints the path
			// to the working directory (--directory flag default value).
			got = bytes.ReplaceAll(got, []byte(wd), []byte("/tmp/coder-cli-test-workdir"))

			gf := filepath.Join("testdata", strings.Replace(tt.name, " ", "_", -1)+".golden")
			if *updateGoldenFiles {
				t.Logf("update golden file for: %q: %s", tt.name, gf)
				err = os.WriteFile(gf, got, 0o600)
				require.NoError(t, err, "update golden file")
			}

			want, err := os.ReadFile(gf)
			require.NoError(t, err, "read golden file, run \"make update-golden-files\" and commit the changes")
			// Remove CRLF newlines (Windows).
			want = bytes.ReplaceAll(want, []byte{'\r', '\n'}, []byte{'\n'})
			require.Equal(t, string(want), string(got), "golden file mismatch: %s, run \"make update-golden-files\", verify and commit the changes", gf)
		})
	}
}

func extractVisibleCommandPaths(cmdPath []string, cmds []*cobra.Command) [][]string {
	var cmdPaths [][]string
	for _, c := range cmds {
		if c.Hidden {
			continue
		}
		cmdPath := append(cmdPath, c.Name())
		cmdPaths = append(cmdPaths, cmdPath)
		cmdPaths = append(cmdPaths, extractVisibleCommandPaths(cmdPath, c.Commands())...)
	}
	return cmdPaths
}

func TestRoot(t *testing.T) {
	t.Parallel()
	t.Run("FormatCobraError", func(t *testing.T) {
		t.Parallel()

		t.Run("OK", func(t *testing.T) {
			t.Parallel()

			cmd, _ := clitest.New(t, "delete")

			cmd, err := cmd.ExecuteC()
			errStr := cli.FormatCobraError(err, cmd)
			require.Contains(t, errStr, "Run 'coder delete --help' for usage.")
		})

		t.Run("Verbose", func(t *testing.T) {
			t.Parallel()

			// Test that the verbose error is masked without verbose flag.
			t.Run("NoVerboseAPIError", func(t *testing.T) {
				t.Parallel()

				cmd, _ := clitest.New(t)

				cmd.RunE = func(cmd *cobra.Command, args []string) error {
					var err error = &codersdk.Error{
						Response: codersdk.Response{
							Message: "This is a message.",
						},
						Helper: "Try this instead.",
					}

					err = xerrors.Errorf("wrap me: %w", err)

					return err
				}

				cmd, err := cmd.ExecuteC()
				errStr := cli.FormatCobraError(err, cmd)
				require.Contains(t, errStr, "This is a message. Try this instead.")
				require.NotContains(t, errStr, err.Error())
			})

			// Assert that a regular error is not masked when verbose is not
			// specified.
			t.Run("NoVerboseRegularError", func(t *testing.T) {
				t.Parallel()

				cmd, _ := clitest.New(t)

				cmd.RunE = func(cmd *cobra.Command, args []string) error {
					return xerrors.Errorf("this is a non-codersdk error: %w", xerrors.Errorf("a wrapped error"))
				}

				cmd, err := cmd.ExecuteC()
				errStr := cli.FormatCobraError(err, cmd)
				require.Contains(t, errStr, err.Error())
			})

			// Test that both the friendly error and the verbose error are
			// displayed when verbose is passed.
			t.Run("APIError", func(t *testing.T) {
				t.Parallel()

				cmd, _ := clitest.New(t, "--verbose")

				cmd.RunE = func(cmd *cobra.Command, args []string) error {
					var err error = &codersdk.Error{
						Response: codersdk.Response{
							Message: "This is a message.",
						},
						Helper: "Try this instead.",
					}

					err = xerrors.Errorf("wrap me: %w", err)

					return err
				}

				cmd, err := cmd.ExecuteC()
				errStr := cli.FormatCobraError(err, cmd)
				require.Contains(t, errStr, "This is a message. Try this instead.")
				require.Contains(t, errStr, err.Error())
			})

			// Assert that a regular error is not masked when verbose specified.
			t.Run("RegularError", func(t *testing.T) {
				t.Parallel()

				cmd, _ := clitest.New(t, "--verbose")

				cmd.RunE = func(cmd *cobra.Command, args []string) error {
					return xerrors.Errorf("this is a non-codersdk error: %w", xerrors.Errorf("a wrapped error"))
				}

				cmd, err := cmd.ExecuteC()
				errStr := cli.FormatCobraError(err, cmd)
				require.Contains(t, errStr, err.Error())
			})
		})
	})

	t.Run("Version", func(t *testing.T) {
		t.Parallel()

		buf := new(bytes.Buffer)
		cmd, _ := clitest.New(t, "version")
		cmd.SetOut(buf)
		err := cmd.Execute()
		require.NoError(t, err)

		output := buf.String()
		require.Contains(t, output, buildinfo.Version(), "has version")
		require.Contains(t, output, buildinfo.ExternalURL(), "has url")
	})

	t.Run("Header", func(t *testing.T) {
		t.Parallel()

		done := make(chan struct{})
		srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			assert.Equal(t, "wow", r.Header.Get("X-Testing"))
			w.WriteHeader(http.StatusGone)
			select {
			case <-done:
				close(done)
			default:
			}
		}))
		defer srv.Close()
		buf := new(bytes.Buffer)
		cmd, _ := clitest.New(t, "--header", "X-Testing=wow", "login", srv.URL)
		cmd.SetOut(buf)
		// This won't succeed, because we're using the login cmd to assert requests.
		_ = cmd.Execute()
	})
}