import 'dart:io';

import 'package:flutter/material.dart';
import 'package:path/path.dart' as p;

class Sheet {
  final String author;
  final String name;
  final String path;

  Sheet(this.author, this.name, this.path);
}

Future<List<Sheet>> loadSheetsSorted(List<String> sheetsDirectoryFiles) async {
  var sheets = await _loadSheets(sheetsDirectoryFiles);
  sheets.sort((left, right) => left.name.compareTo(right.name));
  return sheets;
}

Future<List<Sheet>> _loadSheets(List<String> sheetsDirectoryFiles) async {
  final List<Sheet> sheets = List.empty(growable: true);
  var authorDirectories = sheetsDirectoryFiles
      .map((e) => Directory(e))
      .where((element) => element.existsSync());

  for (Directory authorDirectory in authorDirectories) {
    var authorName = p.basename(authorDirectory.path);
    // Ignore hidden directories
    if (authorName.startsWith(".")) {
      continue;
    }

    await for (final FileSystemEntity sheetFile in authorDirectory.list()) {
      if (sheetFile is File) {
        var sheetName = p.basenameWithoutExtension(sheetFile.path);
        // Ignore hidden files
        if (sheetName.startsWith(".")) {
          continue;
        }
        sheetName = sheetName.capitalize();
        sheets.add(Sheet(authorName, sheetName, sheetFile.path));
      }
    }
  }
  return sheets;
}

extension StringExtension on String {
  String capitalize() {
    return "${this[0].toUpperCase()}${substring(1).toLowerCase()}";
  }
}

class SheetsWidget extends StatelessWidget {
  final List<Sheet> sheets;
  final ValueSetter<Sheet> callback;

  const SheetsWidget({super.key, required this.sheets, required this.callback});

  @override
  Widget build(context) {
    return ListView.builder(
        itemCount: sheets.length,
        itemBuilder: (context, index) {
          var sheet = sheets[index];
          return ListTile(
            title: Text(sheet.name),
            subtitle: Text(sheet.author),
            onTap: () => callback(sheet),
          );
        });
  }
}