import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter_gen/gen_l10n/l10n.dart';
import 'package:matrix/matrix.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:vrouter/vrouter.dart';

import 'package:fluffychat/config/app_config.dart';
import 'package:fluffychat/utils/platform_infos.dart';
import 'package:fluffychat/widgets/default_app_bar_search_field.dart';
import 'package:fluffychat/widgets/layouts/one_page_card.dart';
import 'package:fluffychat/widgets/matrix.dart';
import 'homeserver_picker.dart';

class HomeserverPickerView extends StatelessWidget {
  final HomeserverPickerController controller;

  const HomeserverPickerView(this.controller, {Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return OnePageCard(
      child: Scaffold(
        appBar: AppBar(
          titleSpacing: 8,
          title: DefaultAppBarSearchField(
            prefixText: 'https://',
            hintText: L10n.of(context)!.enterYourHomeserver,
            searchController: controller.homeserverController,
            suffix: const Icon(Icons.edit_outlined),
            padding: EdgeInsets.zero,
            onChanged: controller.setDomain,
            readOnly: !AppConfig.allowOtherHomeservers,
            onSubmit: (_) => controller.checkHomeserverAction(),
            unfocusOnClear: false,
            autocorrect: false,
            labelText: L10n.of(context)!.homeserver,
          ),
          elevation: 0,
        ),
        body: ListView(children: [
          Image.asset(
            Theme.of(context).brightness == Brightness.dark
                ? 'assets/banner_dark.png'
                : 'assets/banner.png',
          ),
          if (controller.isLoading)
            const Center(
                child: CircularProgressIndicator.adaptive(strokeWidth: 2))
          else if (controller.error != null)
            Center(
              child: Padding(
                padding: const EdgeInsets.all(12.0),
                child: Text(
                  controller.error!,
                  textAlign: TextAlign.center,
                  style: TextStyle(
                    fontSize: 18,
                    color: Colors.red[900],
                  ),
                ),
              ),
            )
          else
            Padding(
              padding: const EdgeInsets.symmetric(
                horizontal: 12.0,
                vertical: 4.0,
              ),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  if (controller.ssoLoginSupported)
                    Row(children: [
                      const Expanded(child: Divider()),
                      Padding(
                        padding: const EdgeInsets.all(12.0),
                        child: Text(L10n.of(context)!.loginWithOneClick),
                      ),
                      const Expanded(child: Divider()),
                    ]),
                  Wrap(
                    children: [
                      if (controller.ssoLoginSupported) ...{
                        for (final identityProvider
                            in controller.identityProviders)
                          _SsoButton(
                            onPressed: () =>
                                controller.ssoLoginAction(identityProvider.id!),
                            identityProvider: identityProvider,
                          ),
                      },
                    ].toList(),
                  ),
                  if (controller.ssoLoginSupported &&
                      (controller.registrationSupported! ||
                          controller.passwordLoginSupported))
                    Row(children: [
                      const Expanded(child: Divider()),
                      Padding(
                        padding: const EdgeInsets.all(12.0),
                        child: Text(L10n.of(context)!.or),
                      ),
                      const Expanded(child: Divider()),
                    ]),
                  if (controller.passwordLoginSupported) ...[
                    Center(
                      child: _LoginButton(
                        onPressed: () => VRouter.of(context).to('login'),
                        icon: Icon(
                          CupertinoIcons.lock_open_fill,
                          color: Theme.of(context).textTheme.bodyText1!.color,
                        ),
                        labelText: L10n.of(context)!.login,
                      ),
                    ),
                    const SizedBox(height: 12),
                  ],
                  if (controller.registrationSupported!)
                    Center(
                      child: _LoginButton(
                        onPressed: controller.signUpAction,
                        icon: Icon(
                          CupertinoIcons.person_add,
                          color: Theme.of(context).textTheme.bodyText1!.color,
                        ),
                        labelText: L10n.of(context)!.register,
                      ),
                    ),
                ],
              ),
            ),
        ]),
        bottomNavigationBar: Material(
          elevation: 6,
          color: Theme.of(context).scaffoldBackgroundColor,
          child: Wrap(
            alignment: WrapAlignment.center,
            children: [
              TextButton(
                onPressed: () => launch(AppConfig.privacyUrl),
                child: Text(
                  L10n.of(context)!.privacy,
                  style: const TextStyle(
                    decoration: TextDecoration.underline,
                    color: Colors.blueGrey,
                  ),
                ),
              ),
              TextButton(
                onPressed: () => PlatformInfos.showDialog(context),
                child: Text(
                  L10n.of(context)!.about,
                  style: const TextStyle(
                    decoration: TextDecoration.underline,
                    color: Colors.blueGrey,
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _SsoButton extends StatelessWidget {
  final IdentityProvider identityProvider;
  final void Function()? onPressed;
  const _SsoButton({
    Key? key,
    required this.identityProvider,
    this.onPressed,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: onPressed,
      borderRadius: BorderRadius.circular(7),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 12.0, vertical: 8.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          mainAxisSize: MainAxisSize.min,
          children: [
            Material(
              color: Colors.white,
              borderRadius: BorderRadius.circular(7),
              clipBehavior: Clip.hardEdge,
              child: Padding(
                padding: const EdgeInsets.all(2.0),
                child: identityProvider.icon == null
                    ? const Icon(Icons.web_outlined)
                    : CachedNetworkImage(
                        imageUrl: Uri.parse(identityProvider.icon!)
                            .getDownloadLink(
                                Matrix.of(context).getLoginClient())
                            .toString(),
                        width: 32,
                        height: 32,
                      ),
              ),
            ),
            const SizedBox(height: 8),
            Text(
              identityProvider.name ??
                  identityProvider.brand ??
                  L10n.of(context)!.singlesignon,
              style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.bold,
                color: Theme.of(context).textTheme.subtitle2!.color,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class _LoginButton extends StatelessWidget {
  final String? labelText;
  final Widget? icon;
  final void Function()? onPressed;
  const _LoginButton({
    Key? key,
    this.labelText,
    this.icon,
    this.onPressed,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return OutlinedButton.icon(
      style: OutlinedButton.styleFrom(
        minimumSize: const Size(256, 56),
        textStyle: const TextStyle(fontWeight: FontWeight.bold),
        backgroundColor: Theme.of(context).backgroundColor,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppConfig.borderRadius),
        ),
      ),
      onPressed: onPressed,
      icon: icon!,
      label: Text(
        labelText!,
        style: TextStyle(
          color: Theme.of(context).textTheme.bodyText1!.color,
        ),
      ),
    );
  }
}
