import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';
import 'package:keyboard/base/base_page.dart';
import 'package:keyboard/resource/colors.gen.dart';
import 'package:keyboard/resource/string.gen.dart';
import 'package:keyboard/router/app_pages.dart';
import 'package:lottie/lottie.dart';

import '../../resource/assets.gen.dart';
import '../../utils/status_bar_util.dart';
import '../../widget/app_lifecycle_widget.dart';
import '../../widget/gradient_btn.dart';
import 'keyboard_tutorial_controller.dart';

/// 键盘使用教程-引导页
class KeyboardTutorialPage extends BasePage<KeyboardTutorialController> {
  const KeyboardTutorialPage({super.key});

  static start() {
    Get.toNamed(RoutePath.keyboardTutorial);
  }

  /// 跳转并关闭当前页
  static void startAndOffMe() {
    Get.offNamed(RoutePath.keyboardTutorial);
  }

  @override
  bool immersive() {
    // 开启沉浸式
    return true;
  }

  @override
  backgroundColor() {
    return Color(0xFFF6F5FA);
  }

  @override
  Widget buildBody(BuildContext context) {
    return Scaffold(
      backgroundColor: backgroundColor(),
      body: AppLifecycleWidget(
        onAppLifecycleCallback: (isForeground) async {
          // 步骤都做完了，则跳转去键盘引导页
          if (await controller.checkHasComplete()) {
            return;
          }
          // 未完成，则每次切换到前台时，重新检查设置，更新按钮状态
          if (isForeground) {
            controller.checkSetting();
          }
        },
        child: Stack(
          children: [
            // 头部
            Positioned(left: 0, top: 0, right: 0, child: _buildHeader(context)),
            // 状态栏和标题栏
            Positioned(
              left: 0,
              top: 0,
              right: 0,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [_buildStatusBar(), _buildTopBar()],
              ),
            ),
            // 内容，填充剩余部分
            Positioned.fill(
              top: 170.h + StatusBarUtil.getStatusBarHeight(Get.context!),
              left: 0,
              right: 0,
              child: Column(children: [_buildContent()]),
            ),
            // 底部按钮
            Positioned(
              left: 0,
              right: 0,
              bottom: 0,
              child: _buildBottomActionBtn(),
            ),
          ],
        ),
      ),
    );
  }

  /// 导航栏占位
  Widget _buildStatusBar() {
    // 导航栏高度
    double statusBarHeight = StatusBarUtil.getStatusBarHeight(Get.context!);
    return Container(height: statusBarHeight);
  }

  /// 顶部栏
  Widget _buildTopBar() {
    return Container(
      // 宽度撑满父组件
      width: double.infinity,
      height: kToolbarHeight,
      // 背景颜色
      color: Colors.transparent,
      // padding: EdgeInsets.symmetric(horizontal: 16.0),
      child: ConstrainedBox(
        // 设置宽度为无限大，撑满父组件，否则Stack获取不到高度，会报错
        constraints: BoxConstraints(minWidth: double.infinity),
        child: Stack(
          alignment: Alignment.center,
          children: [
            // 返回按钮
            Positioned(
              left: 16.w,
              child: GestureDetector(
                onTap: controller.clickBack,
                child: Assets.images.iconBlackBackArrow.image(
                  width: 24.w,
                  height: 24.h,
                ),
              ),
            ),
            // 视频教程按钮
            Positioned(
              right: 16.w,
              child: Visibility(
                visible: false,
                child: GestureDetector(
                  onTap: () {
                    controller.clickTutorialVideo();
                  },
                  child: Text(
                    StringName.keyboardTutorialVideo,
                    style: TextStyle(
                      color: ColorName.black85,
                      fontSize: 14.sp,
                      fontWeight: FontWeight.w500,
                      // 下划线
                      decoration: TextDecoration.underline,
                      // 下划线颜色
                      decorationColor: ColorName.black85,
                      // 下划线粗细
                      decorationThickness: 1.0,
                    ),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  /// 头部布局
  Widget _buildHeader(BuildContext context) {
    return SizedBox(
      width: double.infinity,
      height: 298.h,
      child: Stack(
        alignment: Alignment.center,
        children: [
          // 头像
          Positioned(
            top: 37.5.h,
            bottom: 86.5.h,
            child: Assets.images.iconKeyboardTutorialHeader.image(
              height: 174.h,
              fit: BoxFit.cover,
            ),
          ),
          // 蒙版
          Assets.images.bgKeyboardTutorialHeaderMask.image(
            width: double.infinity,
            height: double.infinity,
          ),
          // 提示语
          Positioned(
            top: 70.h + StatusBarUtil.getStatusBarHeight(context),
            child: Assets.images.iconKeyboardTutorialHeaderSlogan.image(
              width: 200.w,
              height: 73.h,
            ),
          ),
        ],
      ),
    );
  }

  /// 内容
  Widget _buildContent() {
    return Expanded(child: Column(children: [_buildTutorialAnimation()]));
  }

  /// 键盘设置引导动画
  Widget _buildTutorialAnimation() {
    return Lottie.asset(
      Assets.anim.animKeyboardTutorialSetting,
      repeat: true,
      width: 340.w,
    );
  }

  /// 启用键盘按钮
  Widget _buildEnableKeyboard() {
    return Obx(() {
      return Container(
        margin: EdgeInsets.symmetric(horizontal: 50.w),
        child: GradientTextBtn(
          // 是否启用，这里UI设计上，未启用时要高亮按钮，所以要取反
          enable: !controller.isKeyboardEnable.value,
          StringName.tutorialEnableKeyboardStep,
          onPressed: () {
            // 已启用，不响应点击
            if (controller.isKeyboardEnable.value) {
              return;
            }
            // 去启用键盘
            controller.goEnableKeyboard();
          },
        ),
      );
    });
  }

  /// 悬浮球设置按钮
  Widget _buildFloatingBallActionBtn() {
    return Obx(() {
      bool isKeyboardEnable = controller.isKeyboardEnable.value;
      bool isFloatingWindowEnable = controller.isFloatingWindowEnable.value;
      // 启用了键盘，但悬浮窗权限未获取到，则高亮按钮
      bool isHighlightBtn = isKeyboardEnable && !isFloatingWindowEnable;
      return Container(
        margin: EdgeInsets.symmetric(horizontal: 50.w),
        child: GradientTextBtn(
          enable: isHighlightBtn,
          StringName.tutorialEnableFloatingBallStep,
          onPressed: () {
            // 已获取，不响应点击
            if (controller.isFloatingWindowEnable.value) {
              return;
            }
            // 去启用悬浮球
            controller.jumpFloatingWindowSetting();
          },
        ),
      );
    });
  }

  /// 底部操作按钮
  Widget _buildBottomActionBtn() {
    return Column(
      children: [
        // 启用键盘
        _buildEnableKeyboard(),
        SizedBox(height: 20.h),
        // 启用悬浮球
        _buildFloatingBallActionBtn(),
        // 距离底部一定距离
        SizedBox(height: 25.h),
      ],
    );
  }
}