package com.sw.platecabinet.adapter

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.viewbinding.ViewBinding
import com.sw.platecabinet.R

/**
 * 通用分页适配器（支持ViewBinding）
 */
class GenericPageAdapter<T, VB : ViewBinding>(
    private var pages: List<List<T>>,
    private val pageLayoutId: Int,
    private val itemBindingInflater: (LayoutInflater, ViewGroup, Boolean) -> VB,
    private val itemBindCallback: VB.(item: T, position: Int) -> Unit
) : RecyclerView.Adapter<GenericPageAdapter<T, VB>.PageViewHolder>() {

    fun updatePages(newPages: List<List<T>>) {
        this.pages = newPages
        notifyDataSetChanged()
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PageViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(pageLayoutId, parent, false)
        val holder = PageViewHolder(view)

        // 在创建ViewHolder时设置ItemDecoration，只设置一次
        holder.childRecyclerView.addItemDecoration(
            GridSpacingItemDecoration(
                spanCount = 2,
                spacing = view.context.dpToPx(12),
                includeEdge = true // 包含边缘间距
            )
        )

        return holder
    }

    override fun onBindViewHolder(holder: PageViewHolder, position: Int) {
        holder.bind(pages[position])
    }

    override fun getItemCount(): Int = pages.size

    inner class PageViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val childRecyclerView: RecyclerView = itemView.findViewById(R.id.childRecyclerView)

        init {
            childRecyclerView.layoutManager = GridLayoutManager(itemView.context, 2)
        }

        fun bind(items: List<T>) {
            childRecyclerView.adapter =
                GenericItemAdapter(items, itemBindingInflater, itemBindCallback)
        }
    }
}

/**
 * 通用子项适配器（支持ViewBinding）
 */
class GenericItemAdapter<T, VB : ViewBinding>(
    private var items: List<T>,
    private val bindingInflater: (LayoutInflater, ViewGroup, Boolean) -> VB,
    private val bindCallback: VB.(item: T, position: Int) -> Unit,
) : RecyclerView.Adapter<GenericItemAdapter<T, VB>.ViewHolder>() {

    inner class ViewHolder(private val binding: VB) : RecyclerView.ViewHolder(binding.root) {
        fun bind(item: T, position: Int) {
            binding.bindCallback(item, position)
        }
    }

    fun updateData(newItem: List<T>) {
        this.items = newItem
        notifyDataSetChanged()
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val binding = bindingInflater(LayoutInflater.from(parent.context), parent, false)
        return ViewHolder(binding)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bind(items[position], position)
    }

    override fun getItemCount(): Int = items.size
}