package com.example.livestreaming;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.ListAdapter;
import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;
import com.example.livestreaming.net.Room;

public class WaterfallRoomsAdapter extends ListAdapter<Room, WaterfallRoomsAdapter.RoomVH> {

    public interface OnRoomClickListener {
        void onRoomClick(Room room);
    }

    private final OnRoomClickListener onRoomClick;

    public WaterfallRoomsAdapter(OnRoomClickListener onRoomClick) {
        super(DIFF);
        this.onRoomClick = onRoomClick;
    }

    @NonNull
    @Override
    public RoomVH onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_room_waterfall, parent, false);
        return new RoomVH(view, onRoomClick);
    }

    @Override
    public void onBindViewHolder(@NonNull RoomVH holder, int position) {
        holder.bind(getItem(position));
    }

    static class RoomVH extends RecyclerView.ViewHolder {

        private final ImageView coverImage;
        private final TextView liveBadge;
        private final LinearLayout viewerCountLayout;
        private final TextView viewerCount;
        private final TextView roomTitle;
        private final ImageView streamerAvatar;
        private final TextView streamerName;
        private final TextView hotBadge;
        private final OnRoomClickListener onRoomClick;

        RoomVH(View itemView, OnRoomClickListener onRoomClick) {
            super(itemView);
            this.onRoomClick = onRoomClick;
            
            coverImage = itemView.findViewById(R.id.coverImage);
            liveBadge = itemView.findViewById(R.id.liveBadge);
            viewerCountLayout = itemView.findViewById(R.id.viewerCountLayout);
            viewerCount = itemView.findViewById(R.id.viewerCount);
            roomTitle = itemView.findViewById(R.id.roomTitle);
            streamerAvatar = itemView.findViewById(R.id.streamerAvatar);
            streamerName = itemView.findViewById(R.id.streamerName);
            hotBadge = itemView.findViewById(R.id.hotBadge);
        }

        void bind(Room room) {
            // TODO: 接入后端接口 - 从后端获取房间封面图片URL
            // 接口路径: GET /api/rooms/{roomId}/cover
            // 请求参数: roomId (路径参数)
            // 返回数据格式: ApiResponse<{coverUrl: string}>
            // 或者Room对象应包含coverUrl字段，直接从room.getCoverUrl()获取
            // TODO: 接入后端接口 - 从后端获取主播头像URL
            // 接口路径: GET /api/user/profile/{streamerId}
            // 请求参数: streamerId (路径参数，从Room对象中获取streamerId)
            // 返回数据格式: ApiResponse<{avatarUrl: string}>
            // TODO: 接入后端接口 - 获取房间观看人数
            // 接口路径: GET /api/rooms/{roomId}/viewers/count
            // 请求参数: roomId (路径参数)
            // 返回数据格式: ApiResponse<{viewerCount: number}>
            // 或者Room对象应包含viewerCount字段，直接从room.getViewerCount()获取
            if (room == null) return;

            // 设置标题
            roomTitle.setText(room.getTitle() != null ? room.getTitle() : "(无标题)");
            
            // 设置主播名称
            streamerName.setText(room.getStreamerName() != null ? room.getStreamerName() : "");

            // 加载封面图片
            String seed = room.getId() != null ? room.getId() : String.valueOf(getBindingAdapterPosition());
            int h = Math.abs(seed.hashCode());
            int imgIndex = (h % 10);
            String[] colors = {"ff6b6b", "4ecdc4", "45b7d1", "96ceb4", "ffeaa7", "dfe6e9", "fd79a8", "a29bfe", "00b894", "e17055"};
            String color = colors[imgIndex];
            String imageUrl = "https://placehold.co/600x450/" + color + "/ffffff?text=LIVE";
            Glide.with(coverImage)
                    .load(imageUrl)
                    .placeholder(R.drawable.bg_cover_placeholder)
                    .centerCrop()
                    .into(coverImage);

            // 设置直播状态
            if (room.isLive()) {
                liveBadge.setVisibility(View.VISIBLE);
                viewerCountLayout.setVisibility(View.VISIBLE);
                int viewers = getViewerCount(room);
                viewerCount.setText(String.valueOf(viewers));
                
                // 如果观看人数超过100，显示热门标签
                if (viewers > 100) {
                    hotBadge.setVisibility(View.VISIBLE);
                } else {
                    hotBadge.setVisibility(View.GONE);
                }
            } else {
                liveBadge.setVisibility(View.GONE);
                viewerCountLayout.setVisibility(View.GONE);
                hotBadge.setVisibility(View.GONE);
            }

            // 点击事件
            itemView.setOnClickListener(v -> {
                if (onRoomClick != null) {
                    onRoomClick.onRoomClick(room);
                }
            });
        }

        private int getViewerCount(Room room) {
            try {
                String seed = room.getId() != null ? room.getId() : String.valueOf(getBindingAdapterPosition());
                int h = Math.abs(seed.hashCode());
                return (h % 380) + 5;
            } catch (Exception ignored) {
                return 0;
            }
        }
    }

    private static final DiffUtil.ItemCallback<Room> DIFF = new DiffUtil.ItemCallback<Room>() {
        @Override
        public boolean areItemsTheSame(@NonNull Room oldItem, @NonNull Room newItem) {
            String o = oldItem.getId();
            String n = newItem.getId();
            return o != null && o.equals(n);
        }

        @Override
        public boolean areContentsTheSame(@NonNull Room oldItem, @NonNull Room newItem) {
            return oldItem.equals(newItem);
        }
    };
}