class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContentView(R.layout.activity_main)
//        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
//            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
//            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
//            insets
//        }

        val recyclerView = findViewById<RecyclerView>(R.id.recyclerView)
        val seekBar = findViewById<SeekBar>(R.id.seekBar)


        // 准备 12 个数据
        val data: MutableList<String> = ArrayList()
        for (i in 1..50) {
            data.add("Item $i")
        }


        // 设置 Adapter
        val adapter = LoopingAdapter(data)
        recyclerView.adapter = adapter


        // 设置 SnapHelper
//        val snapHelper = LinearSnapHelper()
//        snapHelper.attachToRecyclerView(recyclerView)

        // 设置横向 LinearLayoutManager
        val layoutManager = LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)
        recyclerView.layoutManager = layoutManager


        // 设置起始位置
        val startPosition = Int.MAX_VALUE / 2 - (Int.MAX_VALUE / 2 % data.size)
        recyclerView.scrollToPosition(startPosition)

        Log.e("asdasdasdas", "stat===" + startPosition)


        // 添加滚动监听，对齐到第一个可见项目
        recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
                super.onScrollStateChanged(recyclerView, newState)


                if (newState == RecyclerView.SCROLL_STATE_IDLE) { // 滑动停止
                    val layoutManager = recyclerView.layoutManager as LinearLayoutManager?
                    layoutManager?.let {
                        val firstVisiblePosition = it.findFirstVisibleItemPosition()
                        val firstVisibleView = it.findViewByPosition(firstVisiblePosition)

                        firstVisibleView?.let { view ->
                            val offset = view.left // 计算偏移量
                            if (offset != 0) { // 仅当未对齐时才滑动
                                recyclerView.smoothScrollBy(offset, 0)
                            }
                        }
                    }
                }
            }
        })


        // 设置 SeekBar 最大值为数据量
        seekBar.max = data.size - 1

        // 监听 RecyclerView 滚动
        recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                super.onScrolled(recyclerView, dx, dy)
                val firstVisibleItem = layoutManager.findFirstVisibleItemPosition() % data.size
                seekBar.progress = firstVisibleItem
                Log.e("asdasdasdas", "stat===" + firstVisibleItem)
            }
        })
    }
}