package scriptopts

import (
	"errors"
	"os"
	"path/filepath"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestQuotedHashRoundTripKeepsOnlyUnquotedComment(t *testing.T) {
	path := filepath.Join(t.TempDir(), "quoted.conf")
	require.NoError(t, os.WriteFile(path, []byte(`title="a # b" # visible comment`+"\n"), 0o644))
	spec := &Spec{Name: "quoted.conf", Options: []Option{{Key: "title", ValueType: TypeString}}}

	parsed, err := Parse(spec, path)
	require.NoError(t, err)
	assert.Equal(t, `"a # b"`, parsed.GetValue("title"))
	require.NoError(t, parsed.SetValue("title", `"c # d"`))
	require.NoError(t, parsed.Write())

	content, err := os.ReadFile(path)
	require.NoError(t, err)
	assert.Equal(t, `title="c # d" # visible comment`+"\n", string(content))
}

func TestParsedWriteRejectsStaleDiskSnapshot(t *testing.T) {
	path := filepath.Join(t.TempDir(), "stale.conf")
	require.NoError(t, os.WriteFile(path, []byte("title=initial\n"), 0o644))
	spec := &Spec{Name: "stale.conf", Options: []Option{{Key: "title", ValueType: TypeString}}}

	first, err := Parse(spec, path)
	require.NoError(t, err)
	second, err := Parse(spec, path)
	require.NoError(t, err)
	require.NoError(t, first.SetValue("title", "first"))
	require.NoError(t, first.Write())
	require.NoError(t, second.SetValue("title", "stale"))

	err = second.Write()
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrStaleSnapshot), err)
	content, readErr := os.ReadFile(path)
	require.NoError(t, readErr)
	assert.Equal(t, "title=first\n", string(content))
}

func TestParsedMissingWriteRejectsFileCreatedByAnotherWriter(t *testing.T) {
	path := filepath.Join(t.TempDir(), "created.conf")
	spec := &Spec{Name: "created.conf", Options: []Option{{Key: "title", ValueType: TypeString}}}

	parsed, err := Parse(spec, path)
	require.NoError(t, err)
	require.NoError(t, parsed.SetValue("title", "stale"))
	require.NoError(t, os.WriteFile(path, []byte("title=newer\n"), 0o644))

	err = parsed.Write()
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrStaleSnapshot), err)
	content, readErr := os.ReadFile(path)
	require.NoError(t, readErr)
	assert.Equal(t, "title=newer\n", string(content))
}

func TestBackupsPreserveModeAndApplyRetention(t *testing.T) {
	path := filepath.Join(t.TempDir(), "private.conf")
	require.NoError(t, os.WriteFile(path, []byte("title=secret\n"), 0o600))
	spec := &Spec{Name: "private.conf", Options: []Option{{Key: "title", ValueType: TypeString}}}
	parsed, err := Parse(spec, path)
	require.NoError(t, err)

	for index := 0; index < maxBackupsPerScriptOptsFile+5; index++ {
		require.NoError(t, parsed.createBackup())
	}
	backups, err := filepath.Glob(path + "-" + spec.Name + ".bak.*")
	require.NoError(t, err)
	require.Len(t, backups, maxBackupsPerScriptOptsFile)
	for _, backup := range backups {
		info, err := os.Stat(backup)
		require.NoError(t, err)
		assert.Equal(t, os.FileMode(0o600), info.Mode().Perm())
	}
}