import 'dart:ffi';

import 'package:collection/collection.dart';
import 'package:flutter/material.dart';
import 'package:flutter_slidable/flutter_slidable.dart';
import 'package:get/get.dart';
import 'package:sk_base_mobile/app_theme.dart';
import 'package:sk_base_mobile/models/sale_quotation.model.dart';
import 'package:sk_base_mobile/screens/sale_quotation/components/sale_quotation_drawer.dart';
import 'package:sk_base_mobile/screens/sale_quotation/sale_quotation.controller.dart';
import 'package:sk_base_mobile/util/modal.util.dart';
import 'package:sk_base_mobile/util/screen_adaper_util.dart';
import 'package:sk_base_mobile/util/snack_bar.util.dart';
import 'package:sk_base_mobile/widgets/core/sk_number_input.dart';
import 'package:sk_base_mobile/widgets/core/sk_text_input.dart';
import 'package:sk_base_mobile/widgets/empty.dart';
import 'package:sk_base_mobile/widgets/sk_appbar.dart';
import 'package:flutter_sticky_header/flutter_sticky_header.dart';
import 'package:math_expressions/math_expressions.dart';
import 'dart:math' as math;

class SaleQuotationPage extends StatelessWidget {
  SaleQuotationPage({super.key});
  final controller = Get.put(SaleQuotationController());
  final quantityWidth = 140.0;
  final unitPriceWidth = 140.0;
  final amountWidth = 140.0;
  final headerTitleStyle = TextStyle(
      fontSize: ScreenAdaper.height(30),
      fontWeight: FontWeight.w600,
      color: AppTheme.nearlyBlack);
  final headerBgcolor = const Color.fromARGB(255, 238, 238, 238);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: controller.scaffoldKey,
      endDrawer: const Drawer(
        // 从右到左出现
        child: SaleQuotationEndDrawer(),
      ),
      appBar: SkAppbar(
        title: '报价计算',
        action: [
          IconButton(
            onPressed: () {
              controller.scaffoldKey.currentState?.openEndDrawer();
            },
            icon: const Icon(Icons.more_horiz_outlined, color: AppTheme.white),
          ),
          Container(
            padding: EdgeInsets.symmetric(
                vertical: ScreenAdaper.height(10),
                horizontal: ScreenAdaper.width(20)),
            child: Row(mainAxisAlignment: MainAxisAlignment.end, children: [
              GestureDetector(
                onTap: () {
                  controller.addGroup();
                },
                child: Icon(
                  Icons.add,
                  size: ScreenAdaper.height(40),
                ),
              )
            ]),
          ),
        ],
      ),
      body: SafeArea(
        bottom: ScreenAdaper.isLandspace() ? false : true,
        child: Stack(children: [
          Column(
            children: [
              builderHeader(),
              Expanded(
                  child: Obx(() => controller.groups.isEmpty
                      ? Empty(text: '请先添加分组')
                      : CustomScrollView(
                          slivers: controller.groups
                              .mapIndexed<Widget>(
                                  (index, e) => buildBody(index))
                              .toList(),
                        ))),
              // 当键盘弹起时，不显示

              SizedBox(
                height: ScreenAdaper.height(100),
                child: buildTotalCostRow(),
              ),
              SizedBox(
                height: ScreenAdaper.height(100),
                child: buildTotalSalesPriceRow(),
              )
            ],
          ),
          // Positioned(
          //     bottom: ScreenAdaper.height(220),
          //     right: ScreenAdaper.height(10),
          //     child: IconButton(
          //       padding: EdgeInsets.all(ScreenAdaper.height(20)),
          //       style: ButtonStyle(
          //           backgroundColor: MaterialStateProperty.all<Color>(
          //               AppTheme.primaryColorLight)),
          //       onPressed: () {
          //         controller.addGroup();
          //       },
          //       icon: Icon(
          //         Icons.add,
          //         size: ScreenAdaper.height(40),
          //       ),
          //     ))
        ]),
      ),
    );
  }

  Widget buildTotalSalesPriceRow() {
    final formulaController =
        TextEditingController(text: controller.formula.value);
    return Container(
      padding: EdgeInsets.symmetric(
          horizontal: ScreenAdaper.width(20),
          vertical: ScreenAdaper.height(10)),
      decoration: BoxDecoration(
        border: Border(
          top: BorderSide(width: 1, color: Colors.grey[200]!),
        ),
      ),
      child: Row(
        children: [
          Text(
            '合计',
            style: TextStyle(
                fontSize: ScreenAdaper.height(30), fontWeight: FontWeight.w600),
          ),
          Expanded(
            child: Obx(
              () => Container(
                alignment: Alignment.centerLeft,
                padding:
                    EdgeInsets.symmetric(horizontal: ScreenAdaper.width(10)),
                height: ScreenAdaper.height(100),
                width: ScreenAdaper.width(100),
                child: controller.isFormulaEditing.value
                    ? SkTextInput(
                        hint: '',
                        isDense: true,
                        autoFocus: true,
                        onFieldSubmitted: (value) {
                          controller.formula.value = value;
                          controller.isFormulaEditing.value = false;
                        },
                        validator: (String? value) {
                          if (value == null) {
                            return null;
                          }
                          try {
                            Parser p = Parser();
                            Expression exp = p.parse(value);
                            Variable x = Variable('成本');
                            ContextModel cm = ContextModel()
                              ..bindVariable(
                                  x, Number(controller.totalCost.value));
                            exp.evaluate(EvaluationType.REAL, cm);
                            return null;
                          } catch (e) {
                            return '公式错误';
                          }
                        },
                        onChanged: (String formula) {
                          try {
                            controller.calculateTotal(newFormula: formula);
                          } catch (e) {}
                        },
                        onTapOutside: (String value) {
                          controller.formula.value = value;
                          controller.isFormulaEditing.value = false;
                        },
                        contentPadding: EdgeInsets.symmetric(
                            horizontal: ScreenAdaper.width(20),
                            vertical: ScreenAdaper.height(10)),
                        textController: formulaController)
                    : InkWell(
                        onTap: () {
                          controller.isFormulaEditing.value = true;
                        },
                        child: Text('（${controller.formula}）',
                            style: TextStyle(
                                fontSize: ScreenAdaper.height(30),
                                color: AppTheme.grey)),
                      ),
              ),
            ),
          ),
          // IconButton(
          //   onPressed: () {
          //     controller.isFormulaEditing.value =
          //         !controller.isFormulaEditing.value;
          //   },
          //   icon: Icon(Icons.edit, size: ScreenAdaper.height(30)),
          // ),
          Obx(
            () => Text(
              '￥${controller.totalPrice.value}',
              textAlign: TextAlign.right,
              style: TextStyle(
                  fontSize: ScreenAdaper.height(30),
                  fontWeight: FontWeight.w600),
            ),
          )
        ],
      ),
    );
  }

  Widget buildTotalCostRow() {
    return Container(
      padding: EdgeInsets.symmetric(
          horizontal: ScreenAdaper.width(20),
          vertical: ScreenAdaper.height(10)),
      decoration: BoxDecoration(
        border: Border(
          top: BorderSide(width: 1, color: Colors.grey[200]!),
        ),
      ),
      child: Row(
        children: [
          Text(
            '成本',
            style: TextStyle(
                fontSize: ScreenAdaper.height(30), fontWeight: FontWeight.w600),
          ),
          const Spacer(),
          Obx(
            () => Text(
              '￥${controller.totalCost.value}',
              style: TextStyle(
                  fontSize: ScreenAdaper.height(30),
                  fontWeight: FontWeight.w600),
            ),
          )
        ],
      ),
    );
  }

  Widget builderHeader() {
    return Container(
        decoration: BoxDecoration(
            color: headerBgcolor,
            border: Border(
                bottom:
                    BorderSide(color: AppTheme.nearlyBlack.withOpacity(0.5)))),
        padding: EdgeInsets.only(
            left: ScreenAdaper.width(20),
            top: ScreenAdaper.height(10),
            bottom: ScreenAdaper.height(10)),
        child: Row(
          children: [
            Text(
              '名称',
              style: headerTitleStyle,
            ),
            const Spacer(),
            Container(
              alignment: Alignment.center,
              width: ScreenAdaper.width(quantityWidth),
              // constraints: BoxConstraints(minWidth: quantityWidth),
              child: Text(
                '数量',
                style: headerTitleStyle,
              ),
            ),
            Container(
              alignment: Alignment.center,
              width: ScreenAdaper.width(unitPriceWidth),
              // constraints: BoxConstraints(minWidth: ScreenAdaper.width(unitPriceWidth)),
              child: Text(
                '单价',
                style: headerTitleStyle,
              ),
            ),
            Container(
              alignment: Alignment.center,
              width: ScreenAdaper.width(amountWidth),
              child: Text(
                '总价',
                style: headerTitleStyle,
              ),
            ),
          ],
        ));
  }

  Widget buildBody(int groupIndex) {
    return SliverStickyHeader.builder(
      builder: (context, state) => buildGroupHeader(groupIndex, state),
      sliver: Obx(() => !controller.groups[groupIndex].isExpanded.value
          ? SliverList(
              delegate: SliverChildBuilderDelegate(
              (context, i) => const SizedBox(),
              childCount: 0,
            ))
          : SliverList(
              delegate: SliverChildBuilderDelegate(
                (context, int i) => buildRow(groupIndex, i),
                childCount: !controller.groups[groupIndex].isExpanded.value
                    ? 0
                    : controller.groups[groupIndex].items.length,
              ),
            )),
    );
  }

  Widget buildGroupHeader(int groupIndex, SliverStickyHeaderState state) {
    final titleStyle = TextStyle(
        fontSize: ScreenAdaper.height(30),
        color: AppTheme.nearlyBlack,
        fontWeight: FontWeight.w600);
    return Container(
        height: ScreenAdaper.height(80),
        color: headerBgcolor.withOpacity(1.0 - state.scrollPercentage),
        alignment: Alignment.centerLeft,
        child: InkWell(
            onTap: () {
              controller.groups[groupIndex].isExpanded.value =
                  !controller.groups[groupIndex].isExpanded.value;
            },
            child: Row(
              children: [
                Obx(() => controller.groups[groupIndex].isExpanded.value
                    ? IconButton(
                        padding: EdgeInsets.zero,
                        onPressed: () {
                          controller.groups[groupIndex].isExpanded.value =
                              false;
                        },
                        icon: const Icon(
                          Icons.expand_more,
                          color: AppTheme.nearlyBlack,
                        ),
                      )
                    : IconButton(
                        padding: EdgeInsets.zero,
                        onPressed: () {
                          controller.groups[groupIndex].isExpanded.value = true;
                        },
                        icon: const Icon(
                          Icons.chevron_right,
                          color: AppTheme.nearlyBlack,
                        ),
                      )),
                Text(
                  controller.groups[groupIndex].name,
                  style: titleStyle,
                ),
                const Spacer(),
                IconButton(
                    onPressed: () {
                      ModalUtil.alert(
                          contentText: '确定要删除此组吗?',
                          onConfirm: () {
                            controller.removeGroup(groupIndex);
                          });
                    },
                    icon: const Icon(
                      Icons.delete_outline,
                      color: AppTheme.nearlyBlack,
                    )),
                IconButton(
                    onPressed: () {
                      controller.addItems(groupIndex);
                    },
                    icon: const Icon(
                      Icons.add,
                      color: AppTheme.nearlyBlack,
                    )),
              ],
            )));
  }

  Widget buildRow(int groupIndex, int rowIndex) {
    final subTextStyle =
        TextStyle(color: AppTheme.grey, fontSize: ScreenAdaper.height(25));
    return Slidable(
      key: UniqueKey(),
      endActionPane: ActionPane(
        extentRatio: 0.2,
        motion: const DrawerMotion(),
        children: [
          SlidableAction(
            padding: EdgeInsets.zero,
            onPressed: (_) {
              controller.removeItem(groupIndex, rowIndex);
            },
            backgroundColor: AppTheme.dangerColor,
            foregroundColor: Colors.white,
            icon: Icons.delete,
            label: '删除',
          ),
        ],
      ),
      child: Container(
        padding: EdgeInsets.only(
          left: ScreenAdaper.width(20),
          top: ScreenAdaper.height(15),
          bottom: ScreenAdaper.height(15),
        ),
        constraints: BoxConstraints(minHeight: ScreenAdaper.height(100)),
        decoration: BoxDecoration(
          border: Border(
            bottom: BorderSide(width: 1, color: Colors.grey[200]!),
          ),
        ),
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Expanded(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      Expanded(
                        child: Text(
                          controller.groups[groupIndex].items[rowIndex].name,
                          style: TextStyle(
                              fontWeight: FontWeight.w600,
                              fontSize: ScreenAdaper.height(30)),
                        ),
                      ),
                    ],
                  ),
                  if (controller.groups[groupIndex].items[rowIndex].spec !=
                      null)
                    Row(
                      children: [
                        Text(
                          '规格、型号: ',
                          style: subTextStyle,
                        ),
                        Text(
                          controller.groups[groupIndex].items[rowIndex].spec ??
                              '',
                          style: subTextStyle,
                        ),
                      ],
                    ),
                  if (controller.groups[groupIndex].items[rowIndex].unit !=
                      null)
                    Row(
                      children: [
                        Text(
                          '单位: ',
                          style: subTextStyle,
                        ),
                        Text(
                          controller.groups[groupIndex].items[rowIndex].unit ??
                              '',
                          style: subTextStyle,
                        ),
                      ],
                    ),
                  if (controller.groups[groupIndex].items[rowIndex].remark !=
                      null)
                    Row(
                      children: [
                        Text(
                          '备注: ',
                          style: subTextStyle,
                        ),
                        Expanded(
                          child: Text(
                            '${controller.groups[groupIndex].items[rowIndex].remark ?? ''}${controller.groups[groupIndex].items[rowIndex].remark ?? ''}${controller.products[rowIndex].remark ?? ''}',
                            overflow: TextOverflow.ellipsis,
                            style: subTextStyle,
                          ),
                        ),
                      ],
                    ),
                ],
              ),
            ),
            const VerticalDivider(),
            buildEditCell<int>(
                Container(
                  alignment: Alignment.center,
                  width: ScreenAdaper.width(quantityWidth),
                  child: Text(
                    '${controller.groups[groupIndex].items[rowIndex].quantity}',
                    style: TextStyle(fontSize: ScreenAdaper.height(25)),
                  ),
                ),
                groupIndex: groupIndex,
                rowIndex: rowIndex,
                field: 'quantity',
                inputWidth: ScreenAdaper.width(quantityWidth),
                value: controller.groups[groupIndex].items[rowIndex].quantity,
                func: (value) {
              // 取消失去焦点，并且弹窗警告
              bool isValid = value > 0;
              if (!isValid) {
                SnackBarUtil().error('数量必须>0,若想删除产品0，请左滑');
              }
              return isValid;
            }),
            buildEditCell<int>(
                Container(
                  alignment: Alignment.center,
                  width: ScreenAdaper.width(unitPriceWidth),
                  child: Text(
                    '${controller.groups[groupIndex].items[rowIndex].cost}',
                    style: TextStyle(fontSize: ScreenAdaper.height(25)),
                  ),
                ),
                groupIndex: groupIndex,
                rowIndex: rowIndex,
                field: 'cost',
                inputWidth: ScreenAdaper.width(unitPriceWidth),
                value: controller.groups[groupIndex].items[rowIndex].cost),
            buildEditCell<int>(
                Container(
                  alignment: Alignment.center,
                  width: ScreenAdaper.width(amountWidth),
                  child: Text(
                    '${controller.groups[groupIndex].items[rowIndex].amount}',
                    style: TextStyle(fontSize: ScreenAdaper.height(25)),
                  ),
                ),
                groupIndex: groupIndex,
                rowIndex: rowIndex,
                field: 'amount',
                inputWidth: ScreenAdaper.width(amountWidth),
                value: controller.groups[groupIndex].items[rowIndex].amount),
          ],
        ),
      ),
    );
  }

  Widget buildEditCell<T>(
    Widget content, {
    required int groupIndex,
    required int rowIndex,
    required String field,
    required double inputWidth,
    required dynamic value,
    Function(dynamic)? func,
  }) {
    return Obx(() => controller.editingcell[0] == groupIndex &&
            controller.editingcell[1] == rowIndex &&
            controller.editingcell[2] == field
        ? SizedBox(
            width: inputWidth,
            child: SkNumberInput<T>(
                hint: '',
                isDense: true,
                autoFocus: true,
                validator: func,
                onFieldSubmitted: (value) {
                  final editingData =
                      controller.groups[groupIndex].items[rowIndex].toJson();
                  editingData[field] = value as T;
                  controller.saveChanges(groupIndex, rowIndex,
                      SaleQuotationItemModel.fromJson(editingData), field);
                },
                onTapOutside: (dynamic value) {
                  final editingData =
                      controller.groups[groupIndex].items[rowIndex].toJson();
                  editingData[field] = value as T;
                  controller.saveChanges(groupIndex, rowIndex,
                      SaleQuotationItemModel.fromJson(editingData), field);
                },
                contentPadding: EdgeInsets.symmetric(
                    horizontal: ScreenAdaper.width(20),
                    vertical: ScreenAdaper.height(10)),
                textController:
                    TextEditingController(text: '${value == 0 ? '' : value}')),
          )
        : InkWell(
            onTap: () {
              controller.editingcell.value = [groupIndex, rowIndex, field];
            },
            child: content,
          ));
  }
}