import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:saf/saf.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:sheetless/sheetview.dart';

import 'sheet.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Sheetless',
      theme: ThemeData(
        useMaterial3: true,
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  void initState() {
    super.initState();
  }

  Future<String?> getSavedSheetsPath() async {
    final prefs = await SharedPreferences.getInstance();
    return prefs.getString("sheets-path");
  }

  Future<void> saveSheetsPath(String path) async {
    final prefs = await SharedPreferences.getInstance();
    prefs.setString("sheets-path", path);
  }

  Future<String?> askForSheetsPath() async {
    return await FilePicker.platform.getDirectoryPath();
  }

  Future<String> findAndSaveSheetsPath() async {
    String? savedSheetsPath = await getSavedSheetsPath();
    if (savedSheetsPath != null) {
      return savedSheetsPath;
    }

    String? selectedSheetsPath = await askForSheetsPath();
    if (selectedSheetsPath != null) {
      await saveSheetsPath(selectedSheetsPath);
      return selectedSheetsPath;
    }

    return "No path selected";
  }

  Future<String?> getSafPickedSheetsDirectory() async {
    var pickedDirectories = await Saf.getPersistedPermissionDirectories();
    if (pickedDirectories == null || pickedDirectories.isEmpty) {
      return null;
    }
    return pickedDirectories.last;
  }

  Future<List<Sheet>> acquireSheets() async {
    String? sheetsDirectory = await getSafPickedSheetsDirectory();
    if (sheetsDirectory == null || sheetsDirectory.isEmpty) {
      Saf.getDynamicDirectoryPermission(grantWritePermission: false);
      sheetsDirectory = await getSafPickedSheetsDirectory();
      if (sheetsDirectory == null || sheetsDirectory.isEmpty) {
        throw Exception("No Directory selected");
      }
    }

    var sheetsDirectoryFiles = await Saf.getFilesPathFor(sheetsDirectory);
    if (sheetsDirectoryFiles == null) {
      Saf.releasePersistedPermissionFor(sheetsDirectory);
      throw Exception(
          "Permissions for directory no longer valid or Directory deleted. Please restart app.");
    }
    return loadSheetsSorted(sheetsDirectoryFiles);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("My Sheets"),
      ),
      body: FutureBuilder(
          future: acquireSheets(),
          builder: (BuildContext context, AsyncSnapshot<List<Sheet>> snapshot) {
            if (snapshot.hasData) {
              return SheetsWidget(
                sheets: snapshot.data!,
                callback: (sheet) => Navigator.push(
                  context,
                  MaterialPageRoute(
                    builder: (context) => SheetViewerPage(sheet: sheet),
                  ),
                ),
              );
            } else if (snapshot.hasError) {
              return Text(snapshot.error.toString());
            } else {
              return const CircularProgressIndicator();
            }
          }),
    );
  }
}