// Author: fruit.com.cn

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:provider/provider.dart';

import '../../core/data/models/account_export.dart';
import '../../core/data/repositories/account_repository.dart';
import '../../core/data/services/auth_controller.dart';
import '../../core/formatting/error_text.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_dimens.dart';
import '../../core/theme/app_theme.dart';
import '../../core/widgets/auth_gate.dart';
import '../../core/widgets/empty_state.dart';
import '../../core/widgets/plain_page_scaffold.dart';
import '../../l10n/app_localizations.dart';
import 'account_bindings.dart';
import 'account_export_logic.dart';

/// 账号数据导出摘要页。
class AccountExportPage extends StatefulWidget {
  const AccountExportPage({super.key});

  @override
  State<AccountExportPage> createState() => _AccountExportPageState();
}

class _AccountExportPageState extends State<AccountExportPage> {
  late final AccountExportLogic _logic;

  @override
  void initState() {
    super.initState();
    _logic = AccountExportBinding().create(
      context.read<AccountRepository>(),
      (text) => Clipboard.setData(ClipboardData(text: text)),
    );
    unawaited(_logic.load());
  }

  @override
  void dispose() {
    _logic.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final signedIn = context.watch<AuthController>().isSignedIn;
    return Theme(
      data: AppTheme.dark(),
      child: PlainPageScaffold(
        pageKey: const Key('account-export-page'),
        backKey: const Key('account-export-back'),
        title: l10n.accountDataExport,
        child: signedIn
            ? ListenableBuilder(
                listenable: _logic,
                builder: (context, _) => _body(l10n),
              )
            : const AuthGatePanel(),
      ),
    );
  }

  Widget _body(AppLocalizations l10n) {
    if (_logic.loading && _logic.data == null) {
      return const Center(child: CircularProgressIndicator());
    }
    final data = _logic.data;
    if (data == null) {
      return EmptyState(
        key: const Key('account-export-error'),
        icon: Icons.cloud_off_rounded,
        title: errorText(l10n, _logic.error, l10n.accountExportLoadFailed),
        actionLabel: l10n.retry,
        actionKey: const Key('account-export-retry'),
        onAction: _logic.load,
      );
    }
    return ListView(
      key: const Key('account-export-content'),
      padding: const EdgeInsets.fromLTRB(16, 12, 16, 28),
      children: [
        _profileCard(data, l10n),
        const SizedBox(height: 12),
        _credentialsCard(data, l10n),
        const SizedBox(height: 16),
        _copyButton(l10n),
      ],
    );
  }

  Widget _profileCard(AccountExport data, AppLocalizations l10n) => _card(
    children: [
      Text(
        data.profile.nickname,
        style: const TextStyle(fontSize: 19, fontWeight: FontWeight.w700),
      ),
      const SizedBox(height: 4),
      Text(
        '${l10n.accountUid}: ${data.profile.uid}',
        style: const TextStyle(
          color: AppColors.muted,
          fontSize: AppDimens.caption,
        ),
      ),
    ],
  );

  Widget _credentialsCard(AccountExport data, AppLocalizations l10n) => _card(
    children: [
      Text(
        l10n.accountCredentials,
        style: const TextStyle(
          fontSize: AppDimens.listTitle,
          fontWeight: FontWeight.w700,
        ),
      ),
      for (final credential in data.credentials)
        ListTile(
          contentPadding: EdgeInsets.zero,
          leading: const Icon(
            Icons.verified_user_outlined,
            color: AppColors.blueSoft,
          ),
          title: Text(credential.masked),
          subtitle: Text(credential.type),
          trailing: Text(
            credential.verified ? l10n.accountVerified : l10n.accountUnverified,
            style: const TextStyle(
              color: AppColors.muted,
              fontSize: AppDimens.caption,
            ),
          ),
        ),
      _summary(l10n.accountConsentRecords, '${data.consentCount}'),
      _summary(l10n.accountDeviceCount, '${data.deviceCount}'),
    ],
  );

  Widget _copyButton(AppLocalizations l10n) => FilledButton.icon(
    key: const Key('account-export-copy'),
    onPressed: _copy,
    icon: const Icon(Icons.copy_rounded),
    label: Text(l10n.accountCopyJson),
  );

  Widget _card({required List<Widget> children}) => Container(
    padding: const EdgeInsets.all(AppDimens.cardPadding),
    decoration: BoxDecoration(
      color: AppColors.card,
      borderRadius: BorderRadius.circular(AppDimens.cardRadius),
      border: Border.all(color: AppColors.outlineVariantDark),
    ),
    child: Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: children,
    ),
  );

  Widget _summary(String label, String value) => Padding(
    padding: const EdgeInsets.only(top: 8),
    child: Row(
      children: [
        Expanded(
          child: Text(
            label,
            style: const TextStyle(
              color: AppColors.muted,
              fontSize: AppDimens.caption,
            ),
          ),
        ),
        Text(value, style: const TextStyle(fontWeight: FontWeight.w700)),
      ],
    ),
  );

  Future<void> _copy() async {
    final ok = await _logic.copy();
    if (!ok || !mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(AppLocalizations.of(context)!.accountCopied)),
    );
  }
}