package cli_test

import (
	"bytes"
	"os"
	"testing"

	"git.eeqj.de/sneak/secret/internal/cli"
	"git.eeqj.de/sneak/secret/internal/secret"
	"git.eeqj.de/sneak/secret/internal/vault"
	"github.com/awnumar/memguard"
	"github.com/spf13/afero"
	"github.com/spf13/cobra"
	"github.com/stretchr/testify/require"
)

// TestCreateExistingVaultChangesNothing is a regression test for
// https://git.eeqj.de/sneak/secret/issues/74, where running `secret init`
// a second time, or `secret vault create` with the name of an existing
// vault, replaced that vault's keys, so that none of its secrets could be
// decrypted any more. Each must refuse, change nothing, and leave every
// vault's secret readable through its passphrase unlocker.
//
//nolint:paralleltest // the cases share cmd
func TestCreateExistingVaultChangesNothing(t *testing.T) {
	mnemonic := testMnemonicBuffer(t)
	passphrase := memguard.NewBufferFromBytes([]byte(testPassphrase))
	t.Cleanup(passphrase.Destroy)

	// newCLI returns an instance on fs given the mnemonic and the unlock
	// passphrase, as from the environment
	newCLI := func(fs afero.Fs) *cli.Instance {
		c := cli.NewCLIInstanceWithStateDir(fs, testStateDir)
		c.Mnemonic = mnemonic
		c.UnlockPassphrase = passphrase

		return c
	}

	// `secret init`, `secret vault create work`, `secret vault select
	// default`, and the secret "x" in each vault. "work" is then not the
	// current vault, which creating it again must not change.
	fs := afero.NewMemMapFs()
	c := newCLI(fs)
	cmd := &cobra.Command{}

	require.NoError(t, c.Init(cmd))
	require.NoError(t, c.CreateVault(cmd, "work"))
	require.NoError(t, c.SelectVault(cmd, "default"))

	vaults, err := vault.ListVaults(fs, testStateDir)
	require.NoError(t, err)
	require.Len(t, vaults, 2)

	for _, name := range vaults {
		value := memguard.NewBufferFromBytes([]byte("value"))
		err := vault.NewVault(fs, testStateDir, name).AddSecret("x", value, false)
		require.NoError(t, err)
	}

	before := snapshotStateDir(t, fs)

	tests := []struct {
		command string
		want    string
		run     func(c *cli.Instance) error
	}{
		{
			"init",
			"failed to create default vault: vault default already exists",
			func(c *cli.Instance) error { return c.Init(cmd) },
		},
		{
			"vault create default",
			"vault default already exists",
			func(c *cli.Instance) error { return c.CreateVault(cmd, "default") },
		},
		{
			"vault create work",
			"vault work already exists",
			func(c *cli.Instance) error { return c.CreateVault(cmd, "work") },
		},
	}

	for _, tt := range tests {
		t.Run(tt.command, func(t *testing.T) {
			fs := newFsFromSnapshot(t, before)

			err := tt.run(newCLI(fs))

			require.EqualError(t, err, tt.want)
			require.Equal(t, before, snapshotStateDir(t, fs))
		})
	}

	// Every case left the state directory exactly as recorded in before, so
	// reading each vault's secret once from it shows that it still decrypts
	// after each case. Without the mnemonic, reading a secret goes through
	// the vault's passphrase unlocker, which is slow.
	for _, name := range vaults {
		vlt := vault.NewVault(fs, testStateDir, name)
		vlt.UnlockPassphrase = passphrase

		value, err := vlt.GetSecret("x")
		require.NoError(t, err)

		unchanged := bytes.Equal([]byte("value"), value.Bytes())
		value.Destroy()

		require.True(t, unchanged, "vault %q kept its secret", name)
	}
}

// TestVaultCreationLeavesNoSecretInEnvironment is a regression test for
// https://git.eeqj.de/sneak/secret/issues/60, where `secret init` and
// `secret vault create` put the mnemonic into the process environment,
// which every program they ran inherited, and SB_SECRET_MNEMONIC and
// SB_UNLOCK_PASSPHRASE were never unset. Each command, given both, must
// leave neither in the environment.
func TestVaultCreationLeavesNoSecretInEnvironment(t *testing.T) {
	t.Setenv(secret.EnvStateDir, t.TempDir())

	run := func(args ...string) {
		t.Setenv(secret.EnvMnemonic, testMnemonic)
		t.Setenv(secret.EnvUnlockPassphrase, testPassphrase)

		// With no terminal to prompt on, this succeeds only if the command
		// read both variables
		_, err := cli.ExecuteCommandInProcess(args, "", nil)
		require.NoError(t, err)

		for _, name := range []string{secret.EnvMnemonic, secret.EnvUnlockPassphrase} {
			_, set := os.LookupEnv(name)
			require.False(t, set, "%s is set after %v", name, args)
		}
	}

	run("init")
	run("vault", "create", "work")
}

// TestStopAtPassphrasePromptLeavesNothing is a regression test for the
// review of https://git.eeqj.de/sneak/secret/pulls/82: `secret init` or
// `secret vault create` stopped at the passphrase prompt left a vault with
// no unlocker, which neither command would then create again. Each must ask
// for the passphrase before writing anything.
//
//nolint:paralleltest // the cases share cmd
func TestStopAtPassphrasePromptLeavesNothing(t *testing.T) {
	mnemonic := testMnemonicBuffer(t)

	// An empty state directory for `secret init`, and one holding the vault
	// "default" for `secret vault create work`.
	empty := afero.NewMemMapFs()
	require.NoError(t, empty.MkdirAll(testStateDir, secret.DirPerms))

	withDefault := afero.NewMemMapFs()
	_, err := vault.CreateVault(withDefault, testStateDir, "default", mnemonic)
	require.NoError(t, err)

	cmd := &cobra.Command{}

	tests := []struct {
		command string
		fs      afero.Fs
		run     func(c *cli.Instance) error
	}{
		{
			"init",
			empty,
			func(c *cli.Instance) error { return c.Init(cmd) },
		},
		{
			"vault create work",
			withDefault,
			func(c *cli.Instance) error { return c.CreateVault(cmd, "work") },
		},
	}

	for _, tt := range tests {
		t.Run(tt.command, func(t *testing.T) {
			before := snapshotStateDir(t, tt.fs)

			// Given no unlock passphrase, both commands prompt for it, which
			// fails because the tests do not run in a terminal.
			c := cli.NewCLIInstanceWithStateDir(tt.fs, testStateDir)
			c.Mnemonic = mnemonic

			err := tt.run(c)

			require.ErrorContains(t, err, "failed to read passphrase")
			require.Equal(t, before, snapshotStateDir(t, tt.fs))
		})
	}
}