package cli_test

import (
	"bytes"
	"encoding/json"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"sneak.berlin/go/secret/internal/bip39"
	"sneak.berlin/go/secret/internal/secret"
)

// TestGetCommandOutputsToStdout tests that 'secret get' outputs the secret
// value to stdout, not stderr
func TestGetCommandOutputsToStdout(t *testing.T) {
	t.Parallel()

	// Create a temporary directory for our vault; each command is given it
	// in its environment
	tempDir := t.TempDir()

	// Find the secret binary path
	wd, err := filepath.Abs("../..")
	require.NoError(t, err, "should get working directory")

	secretPath := filepath.Join(wd, "secret")
	testPassphrase := "test-passphrase"

	// Initialize vault
	//nolint:gosec // G204: test executes the freshly built secret binary
	cmd := exec.CommandContext(t.Context(), secretPath, "init")
	cmd.Env = []string{
		secret.EnvStateDir + "=" + tempDir,
		secret.EnvMnemonic + "=" + testMnemonic,
		secret.EnvUnlockPassphrase + "=" + testPassphrase,
		"PATH=" + "/usr/bin:/bin",
	}

	output, err := cmd.CombinedOutput()
	require.NoError(t, err, "init should succeed: %s", string(output))

	// The binary, unlike these tests, encrypts the passphrase unlocker's key
	// at age's scrypt work factor, 18. age writes the work factor last on the
	// second line of priv.age: "-> scrypt <salt> <work factor>".
	vaultDir := filepath.Join(tempDir, "vaults.d", "default")
	unlockerName := readFile(t, filepath.Join(vaultDir, "current-unlocker"))
	unlockerDir := filepath.Join(vaultDir, "unlockers.d", string(unlockerName))
	privAge := readFile(t, filepath.Join(unlockerDir, "priv.age"))
	header := strings.SplitN(string(privAge), "\n", 3)
	require.Len(t, header, 3, "priv.age should start with an age header")
	assert.Regexp(t, `^-> scrypt \S+ 18$`, header[1],
		"the passphrase unlocker should be encrypted at scrypt work factor 18")

	// Add a secret
	//nolint:gosec // G204: test executes the freshly built secret binary
	cmd = exec.CommandContext(t.Context(), secretPath, "add", "test/secret")
	cmd.Env = []string{
		secret.EnvStateDir + "=" + tempDir,
		secret.EnvMnemonic + "=" + testMnemonic,
		"PATH=" + "/usr/bin:/bin",
	}
	cmd.Stdin = strings.NewReader("test-secret-value")

	output, err = cmd.CombinedOutput()
	require.NoError(t, err, "add should succeed: %s", string(output))

	// Test that 'secret get' outputs to stdout, not stderr
	//nolint:gosec // G204: test executes the freshly built secret binary
	cmd = exec.CommandContext(t.Context(), secretPath, "get", "test/secret")
	cmd.Env = []string{
		secret.EnvStateDir + "=" + tempDir,
		secret.EnvMnemonic + "=" + testMnemonic,
		"PATH=" + "/usr/bin:/bin",
	}

	var stdout, stderr bytes.Buffer

	cmd.Stdout = &stdout
	cmd.Stderr = &stderr

	err = cmd.Run()
	require.NoError(t, err, "get should succeed")

	// The secret value should be in stdout
	assert.Equal(t, "test-secret-value", strings.TrimSpace(stdout.String()),
		"secret value should be in stdout")

	// Nothing should be in stderr
	assert.Empty(t, stderr.String(), "stderr should be empty")
}

// TestMnemonicAndListingsOutputToStdout tests that 'secret generate
// mnemonic', 'secret vault list' and 'secret unlocker list' print their
// output to stdout, so that it can be piped
func TestMnemonicAndListingsOutputToStdout(t *testing.T) {
	t.Parallel()

	tempDir := t.TempDir()
	secretPath := secretBinaryPath(t)

	// run runs the secret binary and returns what it wrote to stdout and to
	// stderr
	run := func(args ...string) (string, string) {
		//nolint:gosec // G204: test executes the freshly built secret binary
		cmd := exec.CommandContext(t.Context(), secretPath, args...)
		cmd.Env = []string{
			secret.EnvStateDir + "=" + tempDir,
			secret.EnvMnemonic + "=" + testMnemonic,
			secret.EnvUnlockPassphrase + "=test-passphrase",
			"PATH=/usr/bin:/bin",
		}

		var stdout, stderr bytes.Buffer

		cmd.Stdout = &stdout
		cmd.Stderr = &stderr

		err := cmd.Run()
		require.NoError(t, err, "%v should succeed: %s", args, stderr.String())

		return stdout.String(), stderr.String()
	}

	stdout, stderr := run("generate", "mnemonic")
	assert.True(t, bip39.IsMnemonicValid(strings.TrimSpace(stdout)),
		"stdout should hold the mnemonic, not %q", stdout)
	assert.Contains(t, stderr, "Save this mnemonic phrase securely",
		"the warning should be on stderr")

	run("init")

	stdout, _ = run("vault", "list", "--json")

	var vaults map[string]any

	require.NoError(t, json.Unmarshal([]byte(stdout), &vaults),
		"stdout should hold the vaults as JSON, not %q", stdout)
	assert.Equal(t, "default", vaults["currentVault"])

	stdout, _ = run("unlocker", "list", "--json")

	var unlockers map[string]any

	require.NoError(t, json.Unmarshal([]byte(stdout), &unlockers),
		"stdout should hold the unlockers as JSON, not %q", stdout)
	assert.Len(t, unlockers["unlockers"], 1)

	stdout, _ = run("vault", "list")
	assert.Contains(t, stdout, "default (current)")

	stdout, _ = run("unlocker", "list")
	assert.Contains(t, stdout, "Total: 1 unlocker(s)")
}