// Author: fruit.com.cn

import 'dart:async';

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

import '../../core/data/models/account_device.dart';
import '../../core/data/repositories/account_repository.dart';
import '../../core/data/services/auth_controller.dart';
import '../../core/formatting/error_text.dart';
import '../../core/formatting/localized_date_time.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_devices_logic.dart';

const _maskVisible = 4;

/// 登录设备只读列表页。
class AccountDevicesPage extends StatefulWidget {
  const AccountDevicesPage({super.key});

  @override
  State<AccountDevicesPage> createState() => _AccountDevicesPageState();
}

class _AccountDevicesPageState extends State<AccountDevicesPage> {
  late final AccountDevicesLogic _logic;

  @override
  void initState() {
    super.initState();
    _logic = AccountDevicesBinding().create(context.read<AccountRepository>());
    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-devices-page'),
        backKey: const Key('account-devices-back'),
        title: l10n.accountDevices,
        child: signedIn
            ? ListenableBuilder(
                listenable: _logic,
                builder: (context, _) => _body(l10n),
              )
            : const AuthGatePanel(),
      ),
    );
  }

  Widget _body(AppLocalizations l10n) {
    if (_logic.loading && _logic.devices.isEmpty) {
      return const Center(child: CircularProgressIndicator());
    }
    if (_logic.error != null && _logic.devices.isEmpty) {
      return EmptyState(
        key: const Key('account-devices-error'),
        icon: Icons.cloud_off_rounded,
        title: errorText(l10n, _logic.error, l10n.accountDevicesLoadFailed),
        actionLabel: l10n.retry,
        actionKey: const Key('account-devices-retry'),
        onAction: _logic.load,
      );
    }
    if (_logic.devices.isEmpty) {
      return EmptyState(
        key: const Key('account-devices-empty'),
        icon: Icons.devices_other_rounded,
        title: l10n.accountDevicesEmpty,
      );
    }
    return ListView.separated(
      padding: const EdgeInsets.fromLTRB(16, 12, 16, 28),
      itemCount: _logic.devices.length,
      separatorBuilder: (_, _) => const SizedBox(height: 10),
      itemBuilder: (_, index) =>
          _DeviceTile(device: _logic.devices[index], l10n: l10n),
    );
  }
}

class _DeviceTile extends StatelessWidget {
  const _DeviceTile({required this.device, required this.l10n});

  final AccountDevice device;
  final AppLocalizations l10n;

  @override
  Widget build(BuildContext context) {
    return Container(
      key: ValueKey('account-device-${device.id}'),
      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: [
          Row(
            children: [
              const Icon(
                Icons.phone_android_rounded,
                color: AppColors.blueSoft,
              ),
              const SizedBox(width: 8),
              Expanded(
                child: Text(
                  device.deviceModel.isEmpty
                      ? device.platform
                      : device.deviceModel,
                  style: const TextStyle(
                    fontSize: AppDimens.listTitle,
                    fontWeight: FontWeight.w700,
                  ),
                ),
              ),
              _StatusChip(status: device.status, l10n: l10n),
            ],
          ),
          const SizedBox(height: 10),
          _line(l10n.accountPlatform, device.platform),
          _line(l10n.accountDeviceId, _maskDeviceId(device.deviceId)),
          if (device.firstSeenAt != null)
            _line(
              l10n.accountFirstSeen,
              formatLocalizedDateTime(context, device.firstSeenAt!),
            ),
          if (device.lastSeenAt != null)
            _line(
              l10n.accountLastActive,
              formatLocalizedDateTime(context, device.lastSeenAt!),
            ),
        ],
      ),
    );
  }

  Widget _line(String label, String value) => Padding(
    padding: const EdgeInsets.only(top: 4),
    child: Row(
      children: [
        Expanded(
          child: Text(
            label,
            style: const TextStyle(
              color: AppColors.muted,
              fontSize: AppDimens.caption,
            ),
          ),
        ),
        Flexible(
          child: Text(
            value.isEmpty ? '-' : value,
            textAlign: TextAlign.right,
            style: const TextStyle(fontSize: AppDimens.caption),
          ),
        ),
      ],
    ),
  );
}

class _StatusChip extends StatelessWidget {
  const _StatusChip({required this.status, required this.l10n});

  final String status;
  final AppLocalizations l10n;

  @override
  Widget build(BuildContext context) {
    final active = status.toLowerCase() == 'active';
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: active
            ? AppColors.gold.withValues(alpha: 0.16)
            : AppColors.raised,
        borderRadius: BorderRadius.circular(AppDimens.pillRadius),
      ),
      child: Text(
        active ? l10n.accountDeviceActive : l10n.accountDeviceInactive,
        style: TextStyle(
          color: active ? AppColors.gold : AppColors.muted,
          fontSize: AppDimens.caption,
        ),
      ),
    );
  }
}

String _maskDeviceId(String value) {
  if (value.length <= _maskVisible * 2) return value;
  final head = value.substring(0, _maskVisible);
  final tail = value.substring(value.length - _maskVisible);
  return '$head****$tail';
}