package com.example.livestreaming;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import androidx.viewpager2.widget.ViewPager2;

import com.example.livestreaming.net.ApiClient;
import com.example.livestreaming.net.ApiResponse;
import com.example.livestreaming.net.PageResponse;
import com.example.livestreaming.net.Room;
import com.example.livestreaming.net.WorksResponse;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * 我的点赞页面 - 分类显示作品点赞和直播间点赞
 */
public class MyLikesActivity extends AppCompatActivity {

    private TabLayout tabLayout;
    private ViewPager2 viewPager;

    public static void start(Context context) {
        Intent intent = new Intent(context, MyLikesActivity.class);
        context.startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_likes);

        setupToolbar();
        setupViewPager();
    }

    private void setupToolbar() {
        androidx.appcompat.widget.Toolbar toolbar = findViewById(R.id.toolbar);
        if (toolbar != null) {
            setSupportActionBar(toolbar);
            if (getSupportActionBar() != null) {
                getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            }
            toolbar.setNavigationOnClickListener(v -> finish());
        }
    }

    private void setupViewPager() {
        tabLayout = findViewById(R.id.tabLayout);
        viewPager = findViewById(R.id.viewPager);

        LikesPagerAdapter adapter = new LikesPagerAdapter(this);
        viewPager.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager, (tab, position) -> {
            switch (position) {
                case 0:
                    tab.setText("作品");
                    break;
                case 1:
                    tab.setText("直播间");
                    break;
            }
        }).attach();
    }

    /**
     * ViewPager适配器
     */
    private static class LikesPagerAdapter extends FragmentStateAdapter {
        public LikesPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
            super(fragmentActivity);
        }

        @NonNull
        @Override
        public Fragment createFragment(int position) {
            if (position == 0) {
                return new LikedWorksFragment();
            } else {
                return new LikedRoomsFragment();
            }
        }

        @Override
        public int getItemCount() {
            return 2;
        }
    }


    /**
     * 点赞的作品Fragment
     */
    public static class LikedWorksFragment extends Fragment {
        private RecyclerView recyclerView;
        private SwipeRefreshLayout swipeRefreshLayout;
        private View emptyView;
        private View loadingView;
        private WorksAdapter adapter;
        private final List<WorksResponse> likedWorks = new ArrayList<>();
        private int currentPage = 1;
        private boolean isLoading = false;
        private boolean hasMore = true;

        @Nullable
        @Override
        public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_list_content, container, false);
        }

        @Override
        public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
            super.onViewCreated(view, savedInstanceState);
            initViews(view);
            setupRecyclerView();
            loadData();
        }

        private void initViews(View view) {
            recyclerView = view.findViewById(R.id.recyclerView);
            swipeRefreshLayout = view.findViewById(R.id.swipeRefreshLayout);
            emptyView = view.findViewById(R.id.emptyView);
            loadingView = view.findViewById(R.id.loadingView);

            ImageView emptyIcon = view.findViewById(R.id.emptyIcon);
            TextView emptyText = view.findViewById(R.id.emptyText);
            if (emptyIcon != null) emptyIcon.setImageResource(R.drawable.ic_like_filled_24);
            if (emptyText != null) emptyText.setText("还没有点赞过作品");

            swipeRefreshLayout.setOnRefreshListener(() -> {
                currentPage = 1;
                hasMore = true;
                loadData();
            });
        }

        private void setupRecyclerView() {
            adapter = new WorksAdapter(work -> {
                if (work != null && getActivity() != null) {
                    WorkDetailActivity.start(getActivity(), String.valueOf(work.getId()));
                }
            });
            recyclerView.setLayoutManager(new GridLayoutManager(getContext(), 2));
            recyclerView.setAdapter(adapter);

            recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override
                public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                    if (dy > 0 && !isLoading && hasMore) {
                        GridLayoutManager lm = (GridLayoutManager) recyclerView.getLayoutManager();
                        if (lm != null) {
                            int total = lm.getItemCount();
                            int lastVisible = lm.findLastVisibleItemPosition();
                            if (lastVisible >= total - 4) {
                                currentPage++;
                                loadData();
                            }
                        }
                    }
                }
            });
        }

        private void loadData() {
            if (isLoading || getContext() == null) return;
            isLoading = true;
            if (currentPage == 1) showLoading();

            ApiClient.getService(getContext())
                    .getMyLikedWorks(currentPage, 20)
                    .enqueue(new Callback<ApiResponse<PageResponse<WorksResponse>>>() {
                        @Override
                        public void onResponse(Call<ApiResponse<PageResponse<WorksResponse>>> call,
                                             Response<ApiResponse<PageResponse<WorksResponse>>> response) {
                            isLoading = false;
                            hideLoading();
                            swipeRefreshLayout.setRefreshing(false);

                            if (response.isSuccessful() && response.body() != null && response.body().isOk()) {
                                PageResponse<WorksResponse> pageData = response.body().getData();
                                if (pageData != null && pageData.getList() != null) {
                                    if (currentPage == 1) likedWorks.clear();
                                    likedWorks.addAll(pageData.getList());
                                    adapter.submitList(new ArrayList<>(likedWorks));
                                    hasMore = pageData.getList().size() >= 20;
                                }
                            }
                            updateEmptyState();
                        }

                        @Override
                        public void onFailure(Call<ApiResponse<PageResponse<WorksResponse>>> call, Throwable t) {
                            isLoading = false;
                            hideLoading();
                            swipeRefreshLayout.setRefreshing(false);
                            if (getContext() != null) {
                                Toast.makeText(getContext(), "加载失败", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
        }

        private void showLoading() {
            if (loadingView != null) loadingView.setVisibility(View.VISIBLE);
        }

        private void hideLoading() {
            if (loadingView != null) loadingView.setVisibility(View.GONE);
        }

        private void updateEmptyState() {
            if (likedWorks.isEmpty()) {
                emptyView.setVisibility(View.VISIBLE);
                recyclerView.setVisibility(View.GONE);
            } else {
                emptyView.setVisibility(View.GONE);
                recyclerView.setVisibility(View.VISIBLE);
            }
        }
    }

    /**
     * 点赞的直播间Fragment
     */
    public static class LikedRoomsFragment extends Fragment {
        private RecyclerView recyclerView;
        private SwipeRefreshLayout swipeRefreshLayout;
        private View emptyView;
        private View loadingView;
        private RoomsAdapter adapter;
        private final List<Room> likedRooms = new ArrayList<>();
        private int currentPage = 1;
        private boolean isLoading = false;
        private boolean hasMore = true;

        @Nullable
        @Override
        public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_list_content, container, false);
        }

        @Override
        public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
            super.onViewCreated(view, savedInstanceState);
            initViews(view);
            setupRecyclerView();
            loadData();
        }

        private void initViews(View view) {
            recyclerView = view.findViewById(R.id.recyclerView);
            swipeRefreshLayout = view.findViewById(R.id.swipeRefreshLayout);
            emptyView = view.findViewById(R.id.emptyView);
            loadingView = view.findViewById(R.id.loadingView);

            ImageView emptyIcon = view.findViewById(R.id.emptyIcon);
            TextView emptyText = view.findViewById(R.id.emptyText);
            if (emptyIcon != null) emptyIcon.setImageResource(R.drawable.ic_live_24);
            if (emptyText != null) emptyText.setText("还没有点赞过直播间");

            swipeRefreshLayout.setOnRefreshListener(() -> {
                currentPage = 1;
                hasMore = true;
                loadData();
            });
        }

        private void setupRecyclerView() {
            adapter = new RoomsAdapter(room -> {
                if (room != null && getActivity() != null) {
                    Intent intent = new Intent(getActivity(), RoomDetailActivity.class);
                    intent.putExtra(RoomDetailActivity.EXTRA_ROOM_ID, room.getId());
                    startActivity(intent);
                }
            });
            recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
            recyclerView.setAdapter(adapter);

            recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override
                public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                    if (dy > 0 && !isLoading && hasMore) {
                        LinearLayoutManager lm = (LinearLayoutManager) recyclerView.getLayoutManager();
                        if (lm != null) {
                            int total = lm.getItemCount();
                            int lastVisible = lm.findLastVisibleItemPosition();
                            if (lastVisible >= total - 2) {
                                currentPage++;
                                loadData();
                            }
                        }
                    }
                }
            });
        }

        private void loadData() {
            if (isLoading || getContext() == null) return;
            isLoading = true;
            if (currentPage == 1) showLoading();

            ApiClient.getService(getContext())
                    .getMyLikedRooms(currentPage, 20)
                    .enqueue(new Callback<ApiResponse<PageResponse<Map<String, Object>>>>() {
                        @Override
                        public void onResponse(Call<ApiResponse<PageResponse<Map<String, Object>>>> call,
                                             Response<ApiResponse<PageResponse<Map<String, Object>>>> response) {
                            isLoading = false;
                            hideLoading();
                            swipeRefreshLayout.setRefreshing(false);

                            if (response.isSuccessful() && response.body() != null && response.body().isOk()) {
                                PageResponse<Map<String, Object>> pageData = response.body().getData();
                                if (pageData != null && pageData.getList() != null) {
                                    if (currentPage == 1) likedRooms.clear();
                                    likedRooms.addAll(convertToRooms(pageData.getList()));
                                    adapter.submitList(new ArrayList<>(likedRooms));
                                    hasMore = pageData.getList().size() >= 20;
                                }
                            }
                            updateEmptyState();
                        }

                        @Override
                        public void onFailure(Call<ApiResponse<PageResponse<Map<String, Object>>>> call, Throwable t) {
                            isLoading = false;
                            hideLoading();
                            swipeRefreshLayout.setRefreshing(false);
                            if (getContext() != null) {
                                Toast.makeText(getContext(), "加载失败", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
        }

        private List<Room> convertToRooms(List<Map<String, Object>> roomMaps) {
            List<Room> rooms = new ArrayList<>();
            for (Map<String, Object> map : roomMaps) {
                Room room = new Room();
                if (map.containsKey("roomId")) room.setId(map.get("roomId"));
                if (map.containsKey("roomTitle")) room.setTitle((String) map.get("roomTitle"));
                if (map.containsKey("streamerName")) room.setStreamerName((String) map.get("streamerName"));
                if (map.containsKey("streamerId")) room.setStreamerId(((Number) map.get("streamerId")).intValue());
                if (map.containsKey("coverImage")) room.setCoverImage((String) map.get("coverImage"));
                if (map.containsKey("isLive")) {
                    Object isLive = map.get("isLive");
                    if (isLive instanceof Number) room.setLive(((Number) isLive).intValue() == 1);
                    else if (isLive instanceof Boolean) room.setLive((Boolean) isLive);
                }
                rooms.add(room);
            }
            return rooms;
        }

        private void showLoading() {
            if (loadingView != null) loadingView.setVisibility(View.VISIBLE);
        }

        private void hideLoading() {
            if (loadingView != null) loadingView.setVisibility(View.GONE);
        }

        private void updateEmptyState() {
            if (likedRooms.isEmpty()) {
                emptyView.setVisibility(View.VISIBLE);
                recyclerView.setVisibility(View.GONE);
            } else {
                emptyView.setVisibility(View.GONE);
                recyclerView.setVisibility(View.VISIBLE);
            }
        }
    }
}