import 'package:flutter/cupertino.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../../../resource/colors.gen.dart';
import '../../../widget/gradient_text.dart';
import '../intimacy_analyse_upload/widget/step_label_widget.dart';

/// 步骤卡片，支持设置卡片背景、步骤标题、步骤描述、顶部图标和内容区域
class StepCard extends StatelessWidget {
  /// 卡片背景
  final ImageProvider? bgImageProvider;

  /// 步骤标签
  final String? stepLabel;

  /// 步骤标题
  final String? stepTitle;

  /// 步骤描述
  final String? stepDesc;

  /// 顶部图标
  final Image? topIconWidget;

  /// 内容组件
  final Widget contentWidget;

  /// 是否有步骤
  final bool hasStep;

  const StepCard({
    super.key,
    this.bgImageProvider,
    this.stepLabel,
    this.stepTitle,
    this.stepDesc,
    this.hasStep = true,
    required this.contentWidget,
    this.topIconWidget,
  });

  @override
  Widget build(BuildContext context) {
    BoxDecoration decoration;
    // 没有背景图，使用渐变背景
    if (bgImageProvider == null) {
      decoration = BoxDecoration(
        gradient: LinearGradient(
          colors: [Color(0xFFEFE9FF), Color(0xFFFBFAFF)],
          begin: Alignment.topCenter,
          end: Alignment.bottomRight,
        ),
        shape: BoxShape.rectangle,
        border: Border.all(color: ColorName.white80, width: 1.w),
        borderRadius: BorderRadius.all(Radius.circular(20.r)),
      );
    } else {
      // 背景图
      decoration = BoxDecoration(
        image: DecorationImage(image: bgImageProvider!, fit: BoxFit.fill),
      );
    }
    return Container(
      margin: EdgeInsets.only(left: 12.w, top: 10.h, right: 12.w),
      child: Stack(
        // 不裁切超出区域的子组件，例如下面的顶部的图标
        clipBehavior: Clip.none,
        children: [
          // 顶部的图标
          topIconWidget == null
              ? SizedBox()
              : Positioned(top: -11.h, right: 0, child: topIconWidget!),
          // 卡片背景
          Container(
            decoration: decoration,
            child: Column(
              // 左对齐
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _buildStepLayout(),
                // 内容区域
                contentWidget,
                SizedBox(height: 12.h),
              ],
            ),
          ),
        ],
      ),
    );
  }

  /// 步骤
  Widget _buildStepLayout() {
    if (!hasStep) {
      return SizedBox();
    }

    String stepDescStr = stepDesc ?? "";

    return Column(
      children: [
        // 步骤标题
        Container(
          margin: EdgeInsets.only(
            // 存在步骤标签时，才有左边距
            left: _hasStepLabel() ? 12.w : 0,
            top: 16.h,
            bottom: 4.h,
          ),
          child: _buildStepTitle(),
        ),
        SizedBox(height: 4.h),
        // 步骤描述
        stepDescStr.isNotEmpty
            ? _buildStepDesc(stepDescStr)
            : SizedBox(height: 6.h),
        SizedBox(height: 14.h),
      ],
    );
  }

  /// 是否有步骤标签
  bool _hasStepLabel() {
    String stepLabelStr = stepLabel ?? "";
    return stepLabelStr.isNotEmpty == true;
  }

  /// 是否有步骤标题
  bool _hasStepTitle() {
    String stepTitleStr = stepTitle ?? "";
    return stepTitleStr.isNotEmpty == true;
  }

  /// 是否有步骤标题
  bool _hasStepDesc() {
    String stepDescStr = stepDesc ?? "";
    return stepDescStr.isNotEmpty == true;
  }

  /// 步骤标题
  Widget _buildStepTitle() {
    String stepTitleStr = stepTitle ?? "";

    // 步骤标签
    Widget stepLabelWidget;
    if (_hasStepLabel()) {
      stepLabelWidget = StepLabelWidget(label: stepLabel ?? "");
    } else {
      stepLabelWidget = SizedBox();
    }

    return Row(
      children: [
        // 步骤标签
        stepLabelWidget,
        SizedBox(width: 10.w),
        // 标题
        GradientText(
          // 渐变颜色
          colors: [ColorName.stepTitleColor1, ColorName.stepTitleColor2],
          child: Text(
            stepTitleStr,
            style: TextStyle(fontSize: 20.sp, fontWeight: FontWeight.w700),
          ),
        ),
      ],
    );
  }

  /// 构建步骤描述
  Widget _buildStepDesc(String desc) {
    if (desc.isEmpty) {
      return SizedBox();
    }
    return Row(
      children: [
        Expanded(
          child: Container(
            margin: EdgeInsets.only(left: 12.w, right: 12.w),
            child: Text(
              desc,
              // 超过时显示省略号
              overflow: TextOverflow.ellipsis,
              // 最多多少行
              maxLines: 2,
              style: TextStyle(
                fontSize: 12.sp,
                fontWeight: FontWeight.w400,
                color: ColorName.black60,
              ),
            ),
          ),
        ),
        SizedBox(height: 16.h),
      ],
    );
  }
}