import 'dart:io';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:share_plus/share_plus.dart';

import '../async_action_button.dart';
import '../info_dialog.dart';
import '../share_position_origin.dart';

/// "Teilen"/"Speichern" for a file that is on disk, shared by the file viewer
/// and the media gallery.
Future<void> shareLocalFile(BuildContext context, String path) =>
    runWithErrorDialog(
      context,
      () => SharePlus.instance.share(
        ShareParams(
          files: [XFile(path)],
          sharePositionOrigin: SharePositionOrigin.get(context),
        ),
      ),
    );

Future<void> saveLocalFile(BuildContext context, String path) async {
  try {
    final source = File(path);
    final size = await source.length();
    // file_picker has no path/stream save API, so the whole file
    // gets loaded into RAM. Cap big media; user falls back to share.
    const maxBytes = 200 * 1024 * 1024;
    if (size > maxBytes) {
      if (!context.mounted) return;
      InfoDialog.show(
        context,
        'Diese Datei ist zu groß (${(size / (1024 * 1024)).toStringAsFixed(0)} MB), '
        'um direkt gespeichert zu werden. Nutze stattdessen die Teilen-Funktion.',
        title: 'Speichern nicht möglich',
      );
      return;
    }
    final bytes = await source.readAsBytes();
    final saved = await FilePicker.saveFile(
      fileName: path.split('/').last,
      bytes: bytes,
    );
    if (!context.mounted) return;
    if (saved != null) {
      InfoDialog.show(context, 'Datei gespeichert.');
    }
  } on Object catch (e) {
    if (!context.mounted) return;
    InfoDialog.show(
      context,
      'Speichern fehlgeschlagen: $e',
      copyable: true,
      title: 'Fehler',
    );
  }
}