// Config: load files/ directory tree

// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright (C) 2021-2025  Simon Ruderich

package config

import (
	"fmt"
	"io/fs"
	"os"
	slashpath "path"
	"path/filepath"
	"runtime"

	"ruderich.org/simon/safcm"
)

func LoadFiles(group string) (map[string]*safcm.File, error) {
	basePath := filepath.Join(group, "files")

	// Windows doesn't track permissions.
	windows := runtime.GOOS == "windows"

	files := make(map[string]*safcm.File)
	err := filepath.WalkDir(basePath, func(path string, d fs.DirEntry,
		err error) error {

		if err != nil {
			return err
		}

		info, err := d.Info()
		if err != nil {
			return err
		}
		typ := info.Mode().Type()

		var perm int
		var data []byte
		// Existing permissions of the files are not respected (except for +x
		// on regular files).
		if typ == 0 /* regular file */ {
			perm = 0644
			// Respect +x for files; except on windows where permissions.yaml
			// must be used
			if !windows && info.Mode().Perm()&0100 != 0 {
				perm = 0755
			}
			data, err = os.ReadFile(path)
			if err != nil {
				return err
			}
		} else if typ == fs.ModeDir {
			perm = 0755
		} else if typ == fs.ModeSymlink {
			x, err := os.Readlink(path)
			if err != nil {
				return err
			}
			data = []byte(x)
			perm = 0777 // see remote/sync/files.go
		} else {
			return fmt.Errorf("%q: file type not supported", path)
		}

		// Convert to absolute and slash-separated path as used on the target
		// host
		x, err := filepath.Rel(basePath, path)
		if err != nil {
			return err
		}
		x = slashpath.Join("/", filepath.ToSlash(x))

		files[x] = &safcm.File{
			Path: x,
			Mode: typ | (fs.FileMode(perm) & fs.ModePerm),
			Uid:  -1,
			Gid:  -1,
			Data: data,
		}
		return nil
	})
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, fmt.Errorf("%s: %v", group, err)
	}
	return files, nil
}

// vi: set noet ts=4 sw=4 sts=4: