import 'dart:convert';
import 'dart:typed_data';

import 'package:collection/collection.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_sodium/flutter_sodium.dart';
import 'package:photos/models/collection.dart';
import 'package:photos/services/collections_service.dart';
import 'package:photos/theme/colors.dart';
import 'package:photos/theme/ente_theme.dart';
import 'package:photos/ui/actions/collection/collection_sharing_actions.dart';
import 'package:photos/ui/components/captioned_text_widget.dart';
import 'package:photos/ui/components/divider_widget.dart';
import 'package:photos/ui/components/menu_item_widget/menu_item_widget.dart';
import 'package:photos/ui/components/menu_section_description_widget.dart';
import 'package:photos/ui/sharing/pickers/device_limit_picker_page.dart';
import 'package:photos/ui/sharing/pickers/link_expiry_picker_page.dart';
import 'package:photos/utils/crypto_util.dart';
import 'package:photos/utils/date_time_util.dart';
import 'package:photos/utils/dialog_util.dart';
import 'package:photos/utils/navigation_util.dart';
import 'package:photos/utils/toast_util.dart';

class ManageSharedLinkWidget extends StatefulWidget {
  final Collection? collection;

  const ManageSharedLinkWidget({Key? key, this.collection}) : super(key: key);

  @override
  State<ManageSharedLinkWidget> createState() => _ManageSharedLinkWidgetState();
}

class _ManageSharedLinkWidgetState extends State<ManageSharedLinkWidget> {
  final CollectionActions sharingActions =
      CollectionActions(CollectionsService.instance);

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    final enteColorScheme = getEnteColorScheme(context);
    final PublicURL url = widget.collection!.publicURLs!.firstOrNull!;
    return Scaffold(
      backgroundColor: Theme.of(context).backgroundColor,
      appBar: AppBar(
        elevation: 0,
        title: const Text(
          "Manage link",
        ),
      ),
      body: SingleChildScrollView(
        child: ListBody(
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  MenuItemWidget(
                    captionedTextWidget: const CaptionedTextWidget(
                      title: "Allow adding photos",
                    ),
                    alignCaptionedTextToLeft: true,
                    menuItemColor: getEnteColorScheme(context).fillFaint,
                    trailingWidget: Switch.adaptive(
                      value: widget.collection!.publicURLs?.firstOrNull
                              ?.enableCollect ??
                          false,
                      onChanged: (value) async {
                        await _updateUrlSettings(
                          context,
                          {'enableCollect': value},
                        );

                        setState(() {});
                      },
                    ),
                  ),
                  const MenuSectionDescriptionWidget(
                    content:
                        "Allow people with the link to also add photos to the shared "
                        "album.",
                  ),
                  const SizedBox(height: 24),
                  MenuItemWidget(
                    alignCaptionedTextToLeft: true,
                    captionedTextWidget: CaptionedTextWidget(
                      title: "Link expiry",
                      subTitle: (url.hasExpiry
                          ? (url.isExpired ? "Expired" : "Enabled")
                          : "Never"),
                      subTitleColor: url.isExpired ? warning500 : null,
                    ),
                    trailingIcon: Icons.chevron_right,
                    menuItemColor: enteColorScheme.fillFaint,
                    surfaceExecutionStates: false,
                    onTap: () async {
                      routeToPage(
                        context,
                        LinkExpiryPickerPage(widget.collection!),
                      ).then((value) {
                        setState(() {});
                      });
                    },
                  ),
                  url.hasExpiry
                      ? MenuSectionDescriptionWidget(
                          content: url.isExpired
                              ? "This link has expired. Please select a new expiry time or disable link expiry."
                              : 'Link will expire on '
                                  '${getFormattedTime(DateTime.fromMicrosecondsSinceEpoch(url.validTill))}',
                        )
                      : const SizedBox.shrink(),
                  const Padding(padding: EdgeInsets.only(top: 24)),
                  MenuItemWidget(
                    captionedTextWidget: CaptionedTextWidget(
                      title: "Device limit",
                      subTitle: widget
                          .collection!.publicURLs!.first!.deviceLimit
                          .toString(),
                    ),
                    trailingIcon: Icons.chevron_right,
                    menuItemColor: enteColorScheme.fillFaint,
                    alignCaptionedTextToLeft: true,
                    isBottomBorderRadiusRemoved: true,
                    onTap: () async {
                      routeToPage(
                        context,
                        DeviceLimitPickerPage(widget.collection!),
                      ).then((value) {
                        setState(() {});
                      });
                    },
                    surfaceExecutionStates: false,
                  ),
                  DividerWidget(
                    dividerType: DividerType.menuNoIcon,
                    bgColor: getEnteColorScheme(context).fillFaint,
                  ),
                  MenuItemWidget(
                    captionedTextWidget: const CaptionedTextWidget(
                      title: "Allow downloads",
                    ),
                    alignCaptionedTextToLeft: true,
                    isBottomBorderRadiusRemoved: true,
                    isTopBorderRadiusRemoved: true,
                    menuItemColor: getEnteColorScheme(context).fillFaint,
                    trailingWidget: Switch.adaptive(
                      value: widget.collection!.publicURLs?.firstOrNull
                              ?.enableDownload ??
                          true,
                      onChanged: (value) async {
                        await _updateUrlSettings(
                          context,
                          {'enableDownload': value},
                        );
                        if (!value) {
                          showErrorDialog(
                            context,
                            "Please note",
                            "Viewers can still take screenshots or save a copy of your photos using external tools",
                          );
                        }
                        setState(() {});
                      },
                    ),
                  ),
                  DividerWidget(
                    dividerType: DividerType.menuNoIcon,
                    bgColor: getEnteColorScheme(context).fillFaint,
                  ),
                  MenuItemWidget(
                    captionedTextWidget: const CaptionedTextWidget(
                      title: "Password lock",
                    ),
                    alignCaptionedTextToLeft: true,
                    isTopBorderRadiusRemoved: true,
                    menuItemColor: getEnteColorScheme(context).fillFaint,
                    trailingWidget: Switch.adaptive(
                      value: widget.collection!.publicURLs?.firstOrNull
                              ?.passwordEnabled ??
                          false,
                      onChanged: (enablePassword) async {
                        if (enablePassword) {
                          final inputResult =
                              await _displayLinkPasswordInput(context);
                          if (inputResult != null &&
                              inputResult == 'ok' &&
                              _textFieldController.text.trim().isNotEmpty) {
                            final propToUpdate = await _getEncryptedPassword(
                              _textFieldController.text,
                            );
                            await _updateUrlSettings(context, propToUpdate);
                          }
                        } else {
                          await _updateUrlSettings(
                            context,
                            {'disablePassword': true},
                          );
                        }
                        setState(() {});
                      },
                    ),
                  ),
                  const SizedBox(
                    height: 24,
                  ),
                  MenuItemWidget(
                    captionedTextWidget: const CaptionedTextWidget(
                      title: "Remove link",
                      textColor: warning500,
                      makeTextBold: true,
                    ),
                    leadingIcon: Icons.remove_circle_outline,
                    leadingIconColor: warning500,
                    menuItemColor: getEnteColorScheme(context).fillFaint,
                    surfaceExecutionStates: false,
                    onTap: () async {
                      final bool result = await sharingActions.disableUrl(
                        context,
                        widget.collection!,
                      );
                      if (result && mounted) {
                        Navigator.of(context).pop();
                      }
                    },
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  final TextEditingController _textFieldController = TextEditingController();

  Future<String?> _displayLinkPasswordInput(BuildContext context) async {
    _textFieldController.clear();
    return showDialog<String>(
      context: context,
      builder: (context) {
        bool passwordVisible = false;
        return StatefulBuilder(
          builder: (context, setState) {
            return AlertDialog(
              title: const Text('Enter password'),
              content: TextFormField(
                autofillHints: const [AutofillHints.newPassword],
                decoration: InputDecoration(
                  hintText: "Password",
                  contentPadding: const EdgeInsets.all(12),
                  suffixIcon: IconButton(
                    icon: Icon(
                      passwordVisible ? Icons.visibility : Icons.visibility_off,
                      color: Colors.white.withOpacity(0.5),
                      size: 20,
                    ),
                    onPressed: () {
                      passwordVisible = !passwordVisible;
                      setState(() {});
                    },
                  ),
                ),
                obscureText: !passwordVisible,
                controller: _textFieldController,
                autofocus: true,
                autocorrect: false,
                keyboardType: TextInputType.visiblePassword,
                onChanged: (_) {
                  setState(() {});
                },
              ),
              actions: <Widget>[
                TextButton(
                  child: Text(
                    'Cancel',
                    style: Theme.of(context).textTheme.subtitle2,
                  ),
                  onPressed: () {
                    Navigator.pop(context, 'cancel');
                  },
                ),
                TextButton(
                  child:
                      Text('Ok', style: Theme.of(context).textTheme.subtitle2),
                  onPressed: () {
                    if (_textFieldController.text.trim().isEmpty) {
                      return;
                    }
                    Navigator.pop(context, 'ok');
                  },
                ),
              ],
            );
          },
        );
      },
    );
  }

  Future<Map<String, dynamic>> _getEncryptedPassword(String pass) async {
    assert(
      Sodium.cryptoPwhashAlgArgon2id13 == Sodium.cryptoPwhashAlgDefault,
      "mismatch in expected default pw hashing algo",
    );
    final int memLimit = Sodium.cryptoPwhashMemlimitInteractive;
    final int opsLimit = Sodium.cryptoPwhashOpslimitInteractive;
    final kekSalt = CryptoUtil.getSaltToDeriveKey();
    final result = await CryptoUtil.deriveKey(
      utf8.encode(pass) as Uint8List,
      kekSalt,
      memLimit,
      opsLimit,
    );
    return {
      'passHash': Sodium.bin2base64(result),
      'nonce': Sodium.bin2base64(kekSalt),
      'memLimit': memLimit,
      'opsLimit': opsLimit,
    };
  }

  Future<void> _updateUrlSettings(
    BuildContext context,
    Map<String, dynamic> prop,
  ) async {
    final dialog = createProgressDialog(context, "Please wait...");
    await dialog.show();
    try {
      await CollectionsService.instance
          .updateShareUrl(widget.collection!, prop);
      await dialog.hide();
      showShortToast(context, "Album updated");
    } catch (e) {
      await dialog.hide();
      await showGenericErrorDialog(context: context);
    }
  }
}