import 'package:flutter/material.dart';
import 'package:tdesign_flutter/tdesign_flutter.dart';
import '../../core/i18n/app_localizations.dart';
import '../../core/theme/app_colors_extension.dart';

/// 单据状态标签 + 底部操作按钮。
///
/// 根据 [billStatus] 中的 `approvalStatus`（SHCOUNT0~6）、
/// `isClosed`、`isTransferred`、`isCreator`、`canEdit` 控制展示。
///
/// 使用方式：
/// ```dart
/// BillStatusBar(
///   billStatus: _billStatus,
///   onEdit: () => context.push('/xxx/edit/$billNo'),
///   onSubmit: () => api.shSubmit(bilNo: billNo, bilDd: ...),
///   onCancelSubmit: () => api.shSubmit(bilNo: billNo, bilDd: ..., isCancel: true),
///   onTapStatusTag: () => _showAuditTrail(),
/// ),
/// ```
class BillStatusBar {
  /// getBillStatus 接口返回的完整 Map，为 null 时显示空状态。
  final Map<String, dynamic>? billStatus;

  /// "修改"按钮回调
  final VoidCallback? onEdit;

  /// "提交"按钮回调（shSubmit）
  final VoidCallback? onSubmit;

  /// "取消提交"按钮回调（shSubmit + isCancel）
  final VoidCallback? onCancelSubmit;

  /// "还车"按钮回调（仅用车申请单使用）
  final VoidCallback? onReturn;

  /// "修改还车信息"按钮回调（仅用车申请单使用，已还车后显示）
  final VoidCallback? onEditReturn;

  /// 点击状态标签回调（查看审批轨迹）
  final VoidCallback? onTapStatusTag;

  /// 已关闭状态文本（如"已关闭"，仅 expense 使用）
  final String? closedText;

  /// 已转单状态文本（如"已转为报销单"，expense/expense_apply 使用）
  final String? transferredText;

  /// 已还车状态文本（如"已还车"，仅用车申请单使用，优先级最高）
  final String? returnedText;

  /// 单据类型是否配置了审核流。为 false 时提交/取消提交按钮不显示。
  final bool hasAuditFlow;

  const BillStatusBar({
    this.billStatus,
    this.onEdit,
    this.onSubmit,
    this.onCancelSubmit,
    this.onReturn,
    this.onEditReturn,
    this.onTapStatusTag,
    this.closedText,
    this.transferredText,
    this.returnedText,
    this.hasAuditFlow = false,
  });

  // ── 派生状态 ──

  bool get _isClosed => billStatus?['isClosed'] == true;
  bool get _isTransferred => billStatus?['isTransferred'] == true;
  bool get _isReturned {
    final extras = billStatus?['extras'] as Map<String, dynamic>?;
    return extras?['isReturned'] == true;
  }

  String? get _approvalStatus => billStatus?['approvalStatus'] as String?;
  String? get _approvalText => billStatus?['approvalText'] as String?;
  bool get _canEdit => billStatus?['canEdit'] == true;

  // ── 按钮显隐 ──

  bool get showEdit {
    if (_isReturned) return false;
    final s = _approvalStatus;
    if (s == 'SHCOUNT0' || s == 'SHCOUNT3') return _canEdit;
    if (s == 'SHCOUNT6') return _canEdit;
    return false;
  }

  bool get showSubmit {
    if (!hasAuditFlow) return false;
    if (_isClosed || _isTransferred || _isReturned) return false;
    final s = _approvalStatus;
    return s == 'SHCOUNT0' || s == 'SHCOUNT3';
  }

  bool get showCancelSubmit {
    if (!hasAuditFlow) return false;
    if (_isClosed || _isTransferred || _isReturned) return false;
    final s = _approvalStatus;
    return s == 'SHCOUNT1';
  }

  bool get showReturn {
    if (onReturn == null) return false;
    if (_isReturned) return false;
    final s = _approvalStatus;
    return (s == 'SHCOUNT4' || s == 'SHCOUNT6') &&
        !_isClosed &&
        !_isTransferred;
  }

  bool get showEditReturn {
    if (onEditReturn == null) return false;
    return _isReturned;
  }

  bool get _showButtons =>
      showEdit || showSubmit || showCancelSubmit || showReturn || showEditReturn;

  // ── 状态标签数据 ──

  ({IconData icon, Color color}) _statusStyle() {
    if (_isReturned) {
      return (icon: Icons.task_alt, color: Colors.deepPurple);
    }
    if (_isClosed) {
      return (icon: Icons.lock_outline, color: Colors.blueGrey);
    }
    if (_isTransferred) {
      return (icon: Icons.swap_horiz, color: Colors.blue);
    }
    final s = _approvalStatus;
    if (s == null || s.isEmpty) {
      return (icon: Icons.help_outline, color: Colors.grey);
    }
    switch (s) {
      case 'SHCOUNT0':
        return (icon: Icons.edit_note, color: Colors.teal);
      case 'SHCOUNT1':
        return (icon: Icons.hourglass_empty, color: Colors.orange);
      case 'SHCOUNT2':
        return (icon: Icons.cancel_outlined, color: Colors.red);
      case 'SHCOUNT3':
        return (icon: Icons.undo, color: Colors.deepOrange);
      case 'SHCOUNT4':
        return (icon: Icons.check_circle_outline, color: Colors.green);
      case 'SHCOUNT5':
        return (icon: Icons.sync, color: Colors.blue);
      case 'SHCOUNT6':
        return (icon: Icons.verified, color: Colors.indigo);
      default:
        return (icon: Icons.help_outline, color: Colors.grey);
    }
  }

  String? get _displayText {
    if (_isReturned) return returnedText;
    if (_isClosed) return closedText;
    if (_isTransferred) return transferredText;
    return _approvalText;
  }

  // ── 构建 ──

  /// 仅状态标签（用于 FormSection trailing）
  Widget buildStatusTag(BuildContext context) {
    final style = _statusStyle();
    final text = _displayText;
    if (text == null || text.isEmpty) return const SizedBox.shrink();

    final tag = Container(
      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
      decoration: BoxDecoration(
        color: style.color.withValues(alpha: 0.1),
        borderRadius: BorderRadius.circular(6),
        border: Border.all(
          color: style.color.withValues(alpha: 0.3),
          width: 0.5,
        ),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(style.icon, size: 18, color: style.color),
          const SizedBox(width: 4),
          Text(
            text,
            style: TextStyle(
              fontSize: 13,
              fontWeight: FontWeight.w600,
              color: style.color,
            ),
          ),
        ],
      ),
    );

    if (onTapStatusTag != null) {
      return GestureDetector(onTap: onTapStatusTag, child: tag);
    }
    return tag;
  }

  /// 底部操作按钮区
  Widget buildActions(BuildContext context) {
    if (!_showButtons) return const SizedBox.shrink();
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    final l10n = AppLocalizations.of(context);
    final bottomPadding = MediaQuery.of(context).padding.bottom;

    return Container(
      padding: EdgeInsets.fromLTRB(16, 12, 16, 12 + bottomPadding),
      decoration: BoxDecoration(
        color: colors.bgCard,
        border: Border(top: BorderSide(color: colors.border)),
      ),
      child: Row(
        children: [
          if (showEdit) ...[
            Expanded(
              child: TDButton(
                icon: TDIcons.edit,
                text: _editLabel(l10n),
                size: TDButtonSize.medium,
                type: TDButtonType.outline,
                shape: TDButtonShape.round,
                theme: TDButtonTheme.primary,
                onTap: onEdit,
              ),
            ),
          ],
          if (showEdit && (showSubmit || showCancelSubmit))
            const SizedBox(width: 12),
          if (showSubmit)
            Expanded(
              child: TDButton(
                icon: TDIcons.send,
                text: _submitLabel(l10n),
                size: TDButtonSize.medium,
                type: TDButtonType.fill,
                shape: TDButtonShape.round,
                theme: TDButtonTheme.primary,
                onTap: onSubmit,
              ),
            ),
          if (showCancelSubmit)
            Expanded(
              child: TDButton(
                icon: TDIcons.rollback,
                text: _cancelSubmitLabel(l10n),
                size: TDButtonSize.medium,
                type: TDButtonType.fill,
                shape: TDButtonShape.round,
                theme: TDButtonTheme.danger,
                onTap: onCancelSubmit,
              ),
            ),
          if (showReturn) ...[
            if (showEdit || showSubmit || showCancelSubmit)
              const SizedBox(width: 12),
            Expanded(
              child: TDButton(
                icon: Icons.directions_car,
                text: _returnLabel(l10n),
                size: TDButtonSize.medium,
                type: TDButtonType.fill,
                shape: TDButtonShape.round,
                theme: TDButtonTheme.primary,
                onTap: onReturn,
              ),
            ),
          ],
          if (showEditReturn) ...[
            if (showEdit || showSubmit || showCancelSubmit || showReturn)
              const SizedBox(width: 12),
            Expanded(
              child: TDButton(
                icon: Icons.assignment_return_outlined,
                text: _editReturnLabel(l10n),
                size: TDButtonSize.medium,
                type: TDButtonType.outline,
                shape: TDButtonShape.round,
                theme: TDButtonTheme.primary,
                onTap: onEditReturn,
              ),
            ),
          ],
        ],
      ),
    );
  }

  // ── 按钮标签 ──

  /// 默认返回中文按钮标签（不依赖 i18n，简化跨模块复用）
  String _editLabel(AppLocalizations l10n) => l10n.get('modify');
  String _submitLabel(AppLocalizations l10n) => l10n.get('submit');
  String _cancelSubmitLabel(AppLocalizations l10n) => l10n.get('cancelSubmit');
  String _returnLabel(AppLocalizations l10n) => l10n.get('returnCar');
  String _editReturnLabel(AppLocalizations l10n) => l10n.get('editReturnInfo');
}