package com.xscm.moduleutil.diff

import android.os.Bundle
import androidx.recyclerview.widget.DiffUtil
import com.xscm.moduleutil.bean.CircleListBean


class CircleListDiffCallback(
    private val oldList: List<CircleListBean>?,
    private val newList: List<CircleListBean>?
) :
    DiffUtil.Callback() {
    override fun getOldListSize(): Int {
        return oldList?.size ?: 0
    }

    override fun getNewListSize(): Int {
        return newList?.size ?: 0
    }

    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
        return oldList!![oldItemPosition].id == newList!![newItemPosition].id
    }

    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
        val oldItem = oldList!![oldItemPosition]
        val newItem = newList!![newItemPosition]

        // 判断核心数据是否一致（排除动态字段）
        if (!equalsStr(oldItem.nickname, newItem.nickname)) return false
        if (!equalsStr(oldItem.avatar, newItem.avatar)) return false
        if (!equalsStr(oldItem.content, newItem.content)) return false
        if (oldItem.is_like != newItem.is_like) return false
        if (oldItem.sex != newItem.sex) return false
        if (!equalsStr(oldItem.images, newItem.images)) return false

        // 动态字段不参与整体比较（让 getChangePayload 控制）
        return equalsStr(oldItem.rewards_num, newItem.rewards_num)
                && equalsStr(oldItem.like_num, newItem.like_num)
                && equalsStr(oldItem.comment_num, newItem.comment_num)
//                && equalsStr(oldItem.read_num, newItem.read_num)
    }

    override fun getChangePayload(oldItemPosition: Int, newItemPosition: Int): Any? {
        val oldItem = oldList!![oldItemPosition]
        val newItem = newList!![newItemPosition]

        val diff = Bundle()

        if (!equalsStr(oldItem.rewards_num, newItem.rewards_num)) {
            diff.putString("rewards_num", newItem.rewards_num)
        }
        if (!equalsStr(oldItem.like_num, newItem.like_num)) {
            diff.putString("like_num", newItem.like_num)
            diff.putInt("is_like",newItem.is_like)
        }
        if (!equalsStr(oldItem.comment_num, newItem.comment_num)) {
            diff.putString("comment_num", newItem.comment_num)
        }
//        if (!equalsStr(oldItem.read_num, newItem.read_num)) {
//            diff.putString("read_num", newItem.read_num)
//        }

        return if (diff.size() == 0) null else diff
    }

    private fun equalsStr(a: String?, b: String?): Boolean {
        if (a == null && b == null) return true
        if (a == null || b == null) return false
        return a == b
    }
}