// Proves the Phase-0 vault root recording: the path persists through
// SharedPreferences, vaultRootValid() is true ONLY when a path is set AND its
// directory exists, and clearVaultRoot() forgets it. Uses a real temp dir for
// existence checks and a mock SharedPreferences for persistence.

import 'dart:io';

import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:badnote/services/vault_service.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  late Directory tempDir;

  setUp(() async {
    SharedPreferences.setMockInitialValues({});
    tempDir = await Directory.systemTemp.createTemp('vault_service_test');
  });

  tearDown(() async {
    if (await tempDir.exists()) {
      await tempDir.delete(recursive: true);
    }
  });

  Future<VaultService> makeService() async {
    final prefs = await SharedPreferences.getInstance();
    return VaultService.forTest(prefs);
  }

  test('starts with no vault root and is invalid', () async {
    final vault = await makeService();
    expect(vault.vaultRoot, isNull);
    expect(await vault.vaultRootValid(), isFalse);
  });

  test('setVaultRoot persists the path', () async {
    final vault = await makeService();
    await vault.setVaultRoot(tempDir.path);
    expect(vault.vaultRoot, tempDir.path);

    // Re-read through a fresh service over the SAME prefs store: persisted.
    final prefs = await SharedPreferences.getInstance();
    expect(prefs.getString(VaultService.vaultRootKey), tempDir.path);
    final reopened = VaultService.forTest(prefs);
    expect(reopened.vaultRoot, tempDir.path);
  });

  test('vaultRootValid is true only when set AND the dir exists', () async {
    final vault = await makeService();

    // Set to an existing dir → valid.
    await vault.setVaultRoot(tempDir.path);
    expect(await vault.vaultRootValid(), isTrue);

    // Point at a path that does not exist → invalid (folder went missing).
    final missing = '${tempDir.path}${Platform.pathSeparator}gone';
    await vault.setVaultRoot(missing);
    expect(vault.vaultRoot, missing);
    expect(await vault.vaultRootValid(), isFalse);
  });

  test('clearVaultRoot forgets the path and becomes invalid', () async {
    final vault = await makeService();
    await vault.setVaultRoot(tempDir.path);
    expect(await vault.vaultRootValid(), isTrue);

    await vault.clearVaultRoot();
    expect(vault.vaultRoot, isNull);
    expect(await vault.vaultRootValid(), isFalse);
  });

  test('empty stored path is treated as invalid', () async {
    final vault = await makeService();
    await vault.setVaultRoot('');
    expect(await vault.vaultRootValid(), isFalse);
  });

  group('createNotebook', () {
    late Directory srcDir;

    setUp(() async {
      srcDir = await Directory.systemTemp.createTemp('vault_src');
    });

    tearDown(() async {
      if (await srcDir.exists()) await srcDir.delete(recursive: true);
    });

    Future<String> makeSource(String name, [String content = 'pdf-bytes']) async {
      final f = File('${srcDir.path}${Platform.pathSeparator}$name');
      await f.writeAsString(content);
      return f.path;
    }

    test('creates folder, copies file, returns the in-vault path', () async {
      final vault = await makeService();
      await vault.setVaultRoot(tempDir.path);
      final src = await makeSource('Calculus Lecture 3.pdf', 'hello');

      final vaultPath = await vault.createNotebook(src);

      // Returned path is inside the vault, in a folder named from the file.
      final expectedFolder =
          '${tempDir.path}${Platform.pathSeparator}Calculus Lecture 3';
      expect(Directory(expectedFolder).existsSync(), isTrue);
      expect(
        vaultPath,
        '$expectedFolder${Platform.pathSeparator}Calculus Lecture 3.pdf',
      );
      // The file was copied with its contents intact.
      expect(File(vaultPath).existsSync(), isTrue);
      expect(File(vaultPath).readAsStringSync(), 'hello');
      // The original is untouched (copy, not move).
      expect(File(src).existsSync(), isTrue);
    });

    test('de-duplicates the folder name on collision', () async {
      final vault = await makeService();
      await vault.setVaultRoot(tempDir.path);

      final a = await makeSource('Notes.pdf', 'A');
      final firstPath = await vault.createNotebook(a);
      expect(
        firstPath,
        '${tempDir.path}${Platform.pathSeparator}Notes${Platform.pathSeparator}Notes.pdf',
      );

      // Re-import a file with the same basename → suffixed folder.
      final b = await makeSource('Notes.pdf', 'B');
      final secondPath = await vault.createNotebook(b);
      expect(
        secondPath,
        '${tempDir.path}${Platform.pathSeparator}Notes 2${Platform.pathSeparator}Notes.pdf',
      );
      expect(File(secondPath).readAsStringSync(), 'B');
      // First copy still intact.
      expect(File(firstPath).readAsStringSync(), 'A');
    });

    test('throws when no vault root is set', () async {
      final vault = await makeService();
      final src = await makeSource('x.pdf');
      expect(() => vault.createNotebook(src), throwsStateError);
    });
  });

  group('scanNotebooks', () {
    Future<String> writeFile(String path, [String content = 'x']) async {
      final f = File(path);
      await f.create(recursive: true);
      await f.writeAsString(content);
      return f.path;
    }

    test('empty / missing vault yields an empty list', () async {
      final vault = await makeService();
      // No root set.
      expect(await vault.scanNotebooks(), isEmpty);
      // Root set but empty.
      await vault.setVaultRoot(tempDir.path);
      expect(await vault.scanNotebooks(), isEmpty);
    });

    test('lists notebook folders that contain a source file', () async {
      final vault = await makeService();
      await vault.setVaultRoot(tempDir.path);
      final sep = Platform.pathSeparator;

      // A PDF notebook with a sidecar.
      await writeFile('${tempDir.path}${sep}Lecture${sep}Lecture.pdf');
      await writeFile(
        '${tempDir.path}${sep}Lecture${sep}Lecture.pdf.badnote.json',
        '{}',
      );
      // A PPTX notebook without a sidecar.
      await writeFile('${tempDir.path}${sep}Deck${sep}Deck.pptx');
      // A hidden vault-metadata folder is skipped.
      await writeFile('${tempDir.path}$sep.badnote${sep}vault.json', '{}');
      // A folder with no importable file is skipped.
      await writeFile('${tempDir.path}${sep}Empty${sep}readme.txt');

      final notebooks = await vault.scanNotebooks();
      final byName = {for (final n in notebooks) n.filename: n};

      expect(byName.keys, containsAll(['Lecture.pdf', 'Deck.pptx']));
      expect(notebooks.length, 2);

      expect(byName['Lecture.pdf']!.docType, 'pdf');
      expect(byName['Lecture.pdf']!.hasSidecar, isTrue);
      expect(byName['Deck.pptx']!.docType, 'pptx');
      expect(byName['Deck.pptx']!.hasSidecar, isFalse);
    });

    test('a created notebook is discoverable by the scan', () async {
      final vault = await makeService();
      await vault.setVaultRoot(tempDir.path);
      final srcDir = await Directory.systemTemp.createTemp('vault_scan_src');
      try {
        final src = '${srcDir.path}${Platform.pathSeparator}Doc.pdf';
        await File(src).writeAsString('bytes');
        await vault.createNotebook(src);

        final notebooks = await vault.scanNotebooks();
        expect(notebooks.length, 1);
        expect(notebooks.first.filename, 'Doc.pdf');
        expect(notebooks.first.docType, 'pdf');
      } finally {
        await srcDir.delete(recursive: true);
      }
    });
  });
}