import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:tdesign_flutter/tdesign_flutter.dart';
import 'package:go_router/go_router.dart';
import '../../core/theme/app_colors.dart';
import '../../core/utils/responsive.dart';
import '../../shared/widgets/form_section.dart';
import '../../shared/widgets/form_field_row.dart';
import 'expense_apply_controller.dart';
import 'expense_model.dart';

class ExpenseApplyPage extends ConsumerStatefulWidget {
  final String? editId;
  const ExpenseApplyPage({super.key, this.editId});

  @override
  ConsumerState<ExpenseApplyPage> createState() => _ExpenseApplyPageState();
}

class _ExpenseApplyPageState extends ConsumerState<ExpenseApplyPage> {
  final _remarkController = TextEditingController();
  static const _types = ['差旅费', '办公用品', '招待费', '交通费', '通讯费', '其他'];

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

  @override
  Widget build(BuildContext context) {
    final controller =
        ref.watch(expenseApplyProvider(widget.editId).notifier);
    final state = ref.watch(expenseApplyProvider(widget.editId));
    final r = ResponsiveHelper.of(context);

    return Scaffold(
      appBar: TDNavBar(
        title: widget.editId != null ? '编辑报销' : '费用报销申请',
        titleColor: Colors.white,
        backgroundColor: const Color(0xFF00ABF3),
        centerTitle: false,
      ),
      body: Column(
        children: [
          Expanded(
            child: Align(alignment: Alignment.topCenter,
              child: ConstrainedBox(
                constraints: BoxConstraints(maxWidth: r.formMaxWidth),
                child: SingleChildScrollView(
                  padding: const EdgeInsets.symmetric(vertical: 8),
                  child: _buildForm(controller, state),
                ),
              ),
            ),
          ),
          _buildBottomButtons(controller, state),
        ],
      ),
    );
  }

  Widget _buildForm(
      ExpenseApplyController controller, ExpenseApplyState state) {
    return Column(
      children: [
        FormSection(
          title: '基本信息',
          children: [
            FormFieldRow(
              label: '报销类型',
              value: state.expense.expenseType,
              onTap: () => _showTypePicker(controller),
            ),
            FormFieldRow(
              label: '报销金额',
              value: '¥${state.expense.totalAmount.toStringAsFixed(2)}',
              showArrow: false,
            ),
            FormFieldRow(
              label: '备注说明',
              value: state.expense.remark.isEmpty ? null : state.expense.remark,
              hint: '选填',
              onTap: () => _showRemarkEditor(),
            ),
          ],
        ),
        FormSection(
          title: '报销明细',
          trailing: TextButton(
            onPressed: () => _showAddDetailDialog(controller),
            child: const Text('+ 添加明细',
                style: TextStyle(fontSize: 12)),
          ),
          children: state.expense.details.isEmpty
              ? [
                  const Padding(
                    padding: EdgeInsets.all(14),
                    child: Text('暂无明细，点击上方添加',
                        style: TextStyle(
                            color: AppColors.textHint, fontSize: 13)),
                  ),
                ]
              : state.expense.details.asMap().entries.map((entry) {
                  final d = entry.value;
                  return ListTile(
                    title: Text(d.expenseDesc,
                        style: const TextStyle(
                            fontSize: 13,
                            color: AppColors.textPrimary)),
                    trailing: Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Text(
                            '¥${d.totalAmount.toStringAsFixed(2)}',
                            style: const TextStyle(
                                color: AppColors.primary,
                                fontSize: 13)),
                        IconButton(
                          icon: const Icon(Icons.close,
                              size: 16,
                              color: AppColors.textHint),
                          onPressed: () {
                            controller.removeDetail(entry.key);
                            controller.recalculateAmount();
                          },
                        ),
                      ],
                    ),
                  );
                }).toList(),
        ),
        const SizedBox(height: 16),
      ],
    );
  }

  Widget _buildBottomButtons(
      ExpenseApplyController controller, ExpenseApplyState state) {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: Colors.white,
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: 0.05),
            blurRadius: 4,
            offset: const Offset(0, -1),
          ),
        ],
      ),
      child: Row(children: [
        Expanded(
          child: TDButton(
            text: '存草稿',
            size: TDButtonSize.large,
            type: TDButtonType.outline,
            theme: TDButtonTheme.defaultTheme,
            isBlock: true,
            disabled: state.isSubmitting,
            onTap: state.isSubmitting ? null : () async {
              await controller.saveDraft();
              if (context.mounted) context.pop();
            },
          ),
        ),
        const SizedBox(width: 12),
        Expanded(
          flex: 2,
          child: TDButton(
            text: '提交审批',
            size: TDButtonSize.large,
            type: TDButtonType.fill,
            theme: TDButtonTheme.primary,
            isBlock: true,
            disabled: state.isSubmitting,
            onTap: state.isSubmitting ? null : () async {
              final ok = await controller.submit();
              if (context.mounted && ok) context.pop();
            },
          ),
        ),
      ]),
    );
  }

  void _showTypePicker(ExpenseApplyController controller) {
    TDPicker.showMultiPicker(
      context,
      title: '选择报销类型',
      data: [_types],
      onConfirm: (selected) {
        controller.updateType(selected.first);
      },
    );
  }

  void _showRemarkEditor() {
    final state = ref.read(expenseApplyProvider(widget.editId));
    _remarkController.text = state.expense.remark;
    showDialog(
      context: context,
      builder: (_) => TDAlertDialog(
        title: '备注说明',
        contentWidget: TDInput(
          controller: _remarkController,
          maxLines: 3,
          hintText: '请输入备注信息…',
        ),
        leftBtn: TDDialogButtonOptions(title: '取消', action: () => Navigator.pop(context)),
        rightBtn: TDDialogButtonOptions(title: '确定', action: () {
          ref.read(expenseApplyProvider(widget.editId).notifier).updateRemark(_remarkController.text);
          Navigator.pop(context);
        }),
      ),
    );
  }

  void _showAddDetailDialog(ExpenseApplyController controller) {
    final nameCtrl = TextEditingController();
    final amountCtrl = TextEditingController();
    final descCtrl = TextEditingController();
    showDialog(
      context: context,
      builder: (_) => TDAlertDialog(
        title: '添加明细',
        contentWidget: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            TDInput(
              controller: nameCtrl,
              hintText: '费用名称',
            ),
            const SizedBox(height: 8),
            TDInput(
              controller: amountCtrl,
              hintText: '金额',
              inputType: TextInputType.number,
            ),
            const SizedBox(height: 8),
            TDInput(
              controller: descCtrl,
              hintText: '描述',
            ),
          ],
        ),
        leftBtn: TDDialogButtonOptions(title: '取消', action: () => Navigator.pop(context)),
        rightBtn: TDDialogButtonOptions(title: '添加', action: () {
          final amount = double.tryParse(amountCtrl.text) ?? 0.0;
          controller.addDetail(ExpenseDetailModel(
            id: DateTime.now().millisecondsSinceEpoch.toString(),
            expenseId: '',
            expenseDate: DateTime.now(),
            expenseType: '',
            expenseDesc: nameCtrl.text,
            amount: amount,
            totalAmount: amount,
            remark: descCtrl.text,
          ));
          controller.recalculateAmount();
          Navigator.pop(context);
        }),
      ),
    );
  }
}