package main

import (
	"net/http"
	"os"
	"path/filepath"
	"slices"
	"sort"
	"strings"
)

type fsEntry struct {
	Name string `json:"name"`
	Path string `json:"path"`
	Dir  bool   `json:"dir"`
	Size int64  `json:"size"`
	Mod  int64  `json:"mod"`
}

// handleFSList backs the built-in file browser (used when no native file
// dialog is available).
func (a *App) handleFSList(w http.ResponseWriter, r *http.Request) {
	q := r.URL.Query()
	dir := strings.TrimSpace(q.Get("path"))
	showAll := q.Get("all") == "1"
	home, _ := os.UserHomeDir()
	if dir == "" {
		dir = home
		if v := filepath.Join(home, "Videos"); isDir(v) {
			dir = v
		}
	}
	dir, _ = filepath.Abs(dir)
	if st, err := os.Stat(dir); err == nil && !st.IsDir() {
		dir = filepath.Dir(dir)
	}
	des, err := os.ReadDir(dir)
	if err != nil {
		writeError(w, http.StatusBadRequest, "cannot open folder: "+err.Error())
		return
	}
	entries := []fsEntry{}
	for _, de := range des {
		name := de.Name()
		if strings.HasPrefix(name, ".") || strings.Contains(name, ".vibedit-part") {
			continue
		}
		info, err := de.Info()
		if err != nil {
			continue
		}
		isD := info.IsDir()
		if !isD && info.Mode()&os.ModeSymlink != 0 {
			if st, err := os.Stat(filepath.Join(dir, name)); err == nil {
				isD, info = st.IsDir(), st
			}
		}
		if !isD && !showAll {
			ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(name), "."))
			if !slices.Contains(mediaExts, ext) {
				continue
			}
		}
		entries = append(entries, fsEntry{Name: name, Path: filepath.Join(dir, name), Dir: isD, Size: info.Size(), Mod: info.ModTime().Unix()})
	}
	sort.Slice(entries, func(i, j int) bool {
		if entries[i].Dir != entries[j].Dir {
			return entries[i].Dir
		}
		return strings.ToLower(entries[i].Name) < strings.ToLower(entries[j].Name)
	})
	parent := filepath.Dir(dir)
	if parent == dir {
		parent = ""
	}
	writeJSON(w, map[string]any{
		"path":    dir,
		"parent":  parent,
		"entries": entries,
		"roots":   listRoots(),
		"home":    home,
	})
}

func isDir(p string) bool {
	st, err := os.Stat(p)
	return err == nil && st.IsDir()
}