//go:build windows

package files

import (
	"context"
	"fmt"
	"path/filepath"
	"strings"
)

type windowsExecutablePicker struct{ runner commandRunner }

func NewExecutablePicker() ExecutablePicker { return windowsExecutablePicker{runner: execRunner{}} }

func newExecutablePickerWithRunner(runner commandRunner) windowsExecutablePicker {
	return windowsExecutablePicker{runner: runner}
}

func (p windowsExecutablePicker) ChooseExecutable(ctx context.Context) (string, error) {
	if err := ctx.Err(); err != nil {
		return "", err
	}
	output, err := p.runner.Run(ctx, "powershell.exe",
		"-NoProfile", "-NonInteractive", "-STA", "-WindowStyle", "Hidden", "-Command", executableDialogScript)
	if err != nil {
		if ctxErr := ctx.Err(); ctxErr != nil {
			return "", ctxErr
		}
		return "", fmt.Errorf("open executable picker: %w", err)
	}
	selected := strings.TrimSpace(string(output))
	if selected == "" {
		return "", ErrSelectionCanceled
	}
	if !filepath.IsAbs(selected) {
		return "", fmt.Errorf("executable picker returned a non-absolute path")
	}
	if !strings.EqualFold(filepath.Ext(selected), ".exe") {
		return "", fmt.Errorf("executable picker returned a non-executable path")
	}
	return filepath.Clean(selected), nil
}

const executableDialogScript = `[Console]::OutputEncoding = [System.Text.UTF8Encoding]::new($false)
Add-Type -AssemblyName System.Windows.Forms
$dialog = New-Object System.Windows.Forms.OpenFileDialog
$dialog.Title = '选择 Chrome 或 Edge 可执行文件'
$dialog.Filter = '浏览器可执行文件 (*.exe)|*.exe|所有文件 (*.*)|*.*'
$dialog.CheckFileExists = $true
$dialog.Multiselect = $false
if ($dialog.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {
  [Console]::Out.Write($dialog.FileName)
}`