import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';
import 'package:image_picker/image_picker.dart';
import 'package:problem_check_system/controllers/add_problem_controller.dart';

class AddProblemPage extends StatelessWidget {
  AddProblemPage({super.key});

  final AddProblemController controller = Get.put(AddProblemController());

  // 显示底部选择器的方法
  void _showImageSourceBottomSheet(BuildContext context) {
    showModalBottomSheet(
      context: context,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(16.r)),
      ),
      builder: (BuildContext context) {
        return SafeArea(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              SizedBox(height: 16.h),
              Text(
                '选择图片来源',
                style: TextStyle(fontSize: 18.sp, fontWeight: FontWeight.bold),
              ),
              SizedBox(height: 16.h),
              Divider(height: 1.h),
              ListTile(
                leading: Icon(Icons.camera_alt, color: Colors.blue),
                title: Text('拍照'),
                onTap: () {
                  Navigator.pop(context);
                  controller.pickImage(ImageSource.camera);
                },
              ),
              Divider(height: 1.h),
              ListTile(
                leading: Icon(Icons.photo_library, color: Colors.blue),
                title: Text('从相册选择'),
                onTap: () {
                  Navigator.pop(context);
                  controller.pickImage(ImageSource.gallery);
                },
              ),
              Divider(height: 1.h),
              ListTile(
                leading: Icon(Icons.cancel, color: Colors.grey),
                title: Text('取消', style: TextStyle(color: Colors.grey)),
                onTap: () => Navigator.pop(context),
              ),
              SizedBox(height: 8.h),
            ],
          ),
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        flexibleSpace: Container(
          decoration: const BoxDecoration(
            gradient: LinearGradient(
              colors: [Color(0xFF418CFC), Color(0xFF3DBFFC)],
              begin: Alignment.centerLeft,
              end: Alignment.centerRight,
            ),
          ),
        ),
        leading: IconButton(
          icon: const Icon(Icons.arrow_back_ios_new_rounded),
          color: Colors.white,
          onPressed: () {
            Navigator.pop(context);
          },
        ),
        title: const Text('新增问题', style: TextStyle(color: Colors.white)),
        centerTitle: true,
        backgroundColor: Colors.transparent,
      ),
      body: Column(
        children: [
          Expanded(
            child: SingleChildScrollView(
              child: Column(
                children: [
                  Card(
                    margin: EdgeInsets.all(17.w),
                    child: Column(
                      children: [
                        ListTile(
                          title: const Text(
                            '问题描述',
                            style: TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          subtitle: TextField(
                            maxLines: null,
                            controller: controller.descriptionController,
                            decoration: const InputDecoration(
                              hintText: '请输入问题描述',
                              border: InputBorder.none,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                  Card(
                    margin: EdgeInsets.all(17.w),
                    child: Column(
                      children: [
                        ListTile(
                          title: const Text(
                            '所在位置',
                            style: TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          subtitle: TextField(
                            maxLines: null,
                            controller: controller.locationController,
                            decoration: const InputDecoration(
                              hintText: '请输入问题所在位置',
                              border: InputBorder.none,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                  Card(
                    margin: EdgeInsets.all(17.w),
                    child: Column(
                      children: [
                        ListTile(
                          title: const Text(
                            '问题图片',
                            style: TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          subtitle: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              SizedBox(height: 8.h),
                              _buildImageGridWithAddButton(context),
                            ],
                          ),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
            ),
          ),
          _bottomButton(),
        ],
      ),
    );
  }

  Widget _buildImageGridWithAddButton(BuildContext context) {
    return Obx(() {
      // 计算总项目数（图片数 + 添加按钮）
      int totalItems = controller.selectedImages.length + 1;

      return GridView.builder(
        shrinkWrap: true,
        physics: const NeverScrollableScrollPhysics(),
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 3,
          crossAxisSpacing: 8.w,
          mainAxisSpacing: 8.h,
          childAspectRatio: 1,
        ),
        itemCount: totalItems,
        itemBuilder: (context, index) {
          // 如果是最后一个项目，显示添加按钮
          if (index == controller.selectedImages.length) {
            return _buildAddImageButton(context);
          }

          // 否则显示图片
          return _buildImageItem(index);
        },
      );
    });
  }

  Widget _buildAddImageButton(BuildContext context) {
    return InkWell(
      onTap: () => _showImageSourceBottomSheet(context),
      child: Container(
        decoration: BoxDecoration(
          color: Colors.grey.shade100,
          borderRadius: BorderRadius.circular(8),
          border: Border.all(color: Colors.grey.shade300, width: 1),
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              Icons.add_photo_alternate,
              size: 24.sp,
              color: Colors.grey.shade600,
            ),
            SizedBox(height: 4.h),
            Text(
              '添加图片',
              style: TextStyle(color: Colors.grey.shade600, fontSize: 12.sp),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildImageItem(int index) {
    return Container(
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: Colors.grey.shade300),
      ),
      child: Stack(
        children: [
          ClipRRect(
            borderRadius: BorderRadius.circular(8),
            child: Image.file(
              File(controller.selectedImages[index].path),
              width: double.infinity,
              height: double.infinity,
              fit: BoxFit.cover,
            ),
          ),
          Positioned(
            top: 0,
            right: 0,
            child: GestureDetector(
              onTap: () => controller.removeImage(index),
              child: Container(
                decoration: const BoxDecoration(
                  color: Colors.black54,
                  shape: BoxShape.circle,
                ),
                padding: EdgeInsets.all(4.w),
                child: Icon(Icons.close, color: Colors.white, size: 16.sp),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _bottomButton() {
    return Container(
      width: 375.w,
      padding: EdgeInsets.symmetric(horizontal: 20.w, vertical: 10.h),
      decoration: BoxDecoration(
        color: Colors.grey[200],
        borderRadius: BorderRadius.only(
          topLeft: Radius.circular(12.r),
          topRight: Radius.circular(12.r),
        ),
      ),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Expanded(
            child: ElevatedButton(
              style: ElevatedButton.styleFrom(
                backgroundColor: Colors.white,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(8.r),
                ),
                padding: EdgeInsets.symmetric(vertical: 12.h),
              ),
              onPressed: () {
                Get.back();
              },
              child: Text(
                '取消',
                style: TextStyle(color: Colors.grey, fontSize: 16.sp),
              ),
            ),
          ),
          SizedBox(width: 10.w),
          Expanded(
            child: Obx(
              () => ElevatedButton(
                style: ElevatedButton.styleFrom(
                  backgroundColor: const Color(0xFF418CFC),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8.r),
                  ),
                  padding: EdgeInsets.symmetric(vertical: 12.h),
                ),
                onPressed: controller.isLoading.value
                    ? null
                    : () {
                        if (controller.descriptionController.text.isEmpty) {
                          Get.snackbar(
                            '提示',
                            '问题描述不能为空',
                            snackPosition: SnackPosition.TOP,
                            backgroundColor: Colors.black87,
                            colorText: Colors.white,
                          );
                          return;
                        }
                        controller.saveProblem();
                      },
                child: controller.isLoading.value
                    ? SizedBox(
                        width: 20.w,
                        height: 20.h,
                        child: CircularProgressIndicator(
                          strokeWidth: 2,
                          valueColor: const AlwaysStoppedAnimation<Color>(
                            Colors.white,
                          ),
                        ),
                      )
                    : Text(
                        '确定',
                        style: TextStyle(color: Colors.white, fontSize: 16.sp),
                      ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}