/*
 * SPDX-FileCopyrightText: 2019-2021 Vishesh Handa <me@vhanda.in>
 *
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

import 'dart:convert';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:gitjournal/l10n.dart';
import 'package:gitjournal/logger/logger.dart';
import 'package:universal_io/io.dart' as io;

class PublicKeyEditor extends StatelessWidget {
  final Key formKey;
  final TextEditingController _controller;

  const PublicKeyEditor(this.formKey, this._controller);

  @override
  Widget build(BuildContext context) {
    return KeyEditor(formKey, _controller, _validator);
  }

  String? _validator(BuildContext context, String? val) {
    if (val == null) {
      return null;
    }

    val = val.trim();
    if (!val.startsWith("ssh-")) {
      return context.loc.setupKeyEditorsPublic;
    }
    return null;
  }
}

class PrivateKeyEditor extends StatelessWidget {
  final Key formKey;
  final TextEditingController _controller;

  const PrivateKeyEditor(this.formKey, this._controller);

  @override
  Widget build(BuildContext context) {
    return KeyEditor(formKey, _controller, _validator);
  }

  String? _validator(BuildContext context, String? val) {
    if (val == null) {
      return null;
    }

    val = val.trim();
    if (!val.startsWith("-----BEGIN ")) {
      return context.loc.setupKeyEditorsPrivate;
    }
    if (!val.endsWith("PRIVATE KEY-----")) {
      return context.loc.setupKeyEditorsPrivate;
    }

    return null;
  }
}

class KeyEditor extends StatelessWidget {
  final Key formKey;
  final TextEditingController textEditingController;
  final String? Function(BuildContext, String?) validator;

  const KeyEditor(this.formKey, this.textEditingController, this.validator);

  @override
  Widget build(BuildContext context) {
    var inputField = Form(
      key: formKey,
      child: TextFormField(
        textAlign: TextAlign.left,
        maxLines: null,
        style: Theme.of(context).textTheme.bodyMedium,
        autovalidateMode: AutovalidateMode.onUserInteraction,
        validator: (s) => validator(context, s),
        controller: textEditingController,
        decoration: const InputDecoration(
          border: OutlineInputBorder(),
          isDense: true,
        ),
      ),
      autovalidateMode: AutovalidateMode.onUserInteraction,
    );

    var screenSize = MediaQuery.of(context).size;

    return Column(
      children: [
        Container(
          constraints: BoxConstraints(
            maxHeight: screenSize.height / 4,
          ),
          child: SingleChildScrollView(
            child: Container(
              padding: const EdgeInsets.symmetric(vertical: 8.0),
              child: inputField,
            ),
          ),
        ),
        OutlinedButton(
          child: Text(
            context.loc.setupKeyEditorsLoad,
            style: Theme.of(context).textTheme.bodyMedium,
          ),
          onPressed: _pickAndLoadFile,
        ),
      ],
    );
  }

  Future<void> _pickAndLoadFile() async {
    var result = await FilePicker.platform.pickFiles();

    try {
      if (result != null && result.files.isNotEmpty) {
        var pf = result.files.single;
        if (pf.bytes != null) {
          textEditingController.text = utf8.decode(pf.bytes!);
        } else {
          var file = io.File(result.files.single.path!);
          var data = await file.readAsString();
          textEditingController.text = data.trim();
        }
      }
    } catch (e, stackTrace) {
      Log.e(
        "Open File for importing SSH Key",
        ex: e,
        stacktrace: stackTrace,
      );
    }
  }
}