// Package platform 封装操作系统差异，包括隐藏子进程和 WSL 路径转换。
package platform

import (
	"errors"
	"path/filepath"
	"strings"
)

// PathDescriptor 是项目路径的标准描述。WindowsPath 用于 Go 文件扫描，LinuxPath 用于 WSL 内 Git。
type PathDescriptor struct {
	Original    string
	WindowsPath string
	Distro      string
	LinuxPath   string
	WSL         bool
}

// ResolvePath 识别两种 WSL UNC 前缀，并转换为 WSL 内部可识别的 Linux 绝对路径。
func ResolvePath(raw string) (PathDescriptor, error) {
	p := filepath.Clean(strings.TrimSpace(raw))
	if p == "" {
		return PathDescriptor{}, errors.New("PATH_REQUIRED")
	}
	slash := strings.ReplaceAll(p, "/", "\\")
	lower := strings.ToLower(slash)
	prefix := ""
	switch {
	case strings.HasPrefix(lower, "\\\\wsl.localhost\\"):
		prefix = "\\\\wsl.localhost\\"
	case strings.HasPrefix(lower, "\\\\wsl$\\"):
		prefix = "\\\\wsl$\\"
	default:
		return PathDescriptor{Original: raw, WindowsPath: p}, nil
	}
	rest := strings.TrimPrefix(slash, prefix)
	parts := strings.Split(rest, "\\")
	if len(parts) < 2 || parts[0] == "" {
		return PathDescriptor{}, errors.New("WSL_PATH_INVALID")
	}
	distro := parts[0]
	linux := "/" + strings.Join(parts[1:], "/")
	canonical := "\\\\wsl.localhost\\" + distro + "\\" + strings.Join(parts[1:], "\\")
	return PathDescriptor{Original: raw, WindowsPath: canonical, Distro: distro, LinuxPath: linux, WSL: true}, nil
}