package com.example.nemophila;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.os.Bundle;
import android.os.Handler;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.nemophila.entities.Account;
import com.example.nemophila.entities.AccountNameJson;
import com.example.nemophila.viewmodels.AccountViewModel;
import com.example.nemophila.viewmodels.FriendViewModel;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class FriendActivity extends AppCompatActivity {
    private Nemophila nemophila;
    private FriendViewModel friendViewModel;
    private String uid;
    private String token;
    private String requestingId;
    private String requestingName;
    private String searchingId;
    private final ExecutorService executor = Executors.newSingleThreadExecutor();
    private final Handler handler = new Handler();
    private String friendIconUrlString;
    private String requestingIconUrlString;

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

        Button showFriend = findViewById(R.id.showFriend);
        Button showRequesting = findViewById(R.id.showRequesting);
        RecyclerView friendRecyclerView = findViewById(R.id.friendsList);
        LinearLayout requestingConstraintLayout = findViewById(R.id.requestingLayout);

        // 初期化
        List<FriendDataModel> friendsDataset = new ArrayList<>();  // 1行分の情報を持つDataModelを格納するリスト
        RecyclerView rv = findViewById(R.id.friendsList);  // recyclerViewを取得
        friendViewModel = new ViewModelProvider(this).get(FriendViewModel.class);  // ViewModelを取得
        nemophila = (Nemophila) this.getApplication();
        uid = nemophila.getUid();  // 自身のidを取得
        token = nemophila.getToken(); // 自身のtokenを取得

        //一行ずつを縦に(LinearLayout)表示するLayoutManagerを宣言
        LinearLayoutManager llm = new LinearLayoutManager(this);

        // データ1つ1つの区切りが分かるように線を引く
        RecyclerView.ItemDecoration itemDecoration =
                new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
        rv.addItemDecoration(itemDecoration);
        rv.setHasFixedSize(true);
        rv.setLayoutManager(llm);

        // getFriendsの通信が呼び出されて、フレンドの一覧をfriendsDatasetに格納し、Adapterにセットする
        FriendActivityAdapter adapter = new FriendActivityAdapter(friendsDataset) {
            @Override
            void onDeleteClick(View view, int position, FriendDataModel friend) {
                new AlertDialog.Builder(FriendActivity.this)
                        .setTitle("フレンドから" + friend.getName() + "を削除しますか?")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                friendViewModel.deleteFriend(uid, friend.getId(), token);
                            }
                        })
                        .setNegativeButton("キャンセル", null)
                        .create()
                        .show();
            }

            @Override
            void onFavoriteClick(View view, int position, FriendDataModel friend, ImageView favorite) {
                if (favorite.getVisibility() == View.INVISIBLE) {
                    favorite.setVisibility(View.VISIBLE);
                    nemophila.setFavoriteFriends(friend.getId());
                } else {
                    favorite.setVisibility(View.INVISIBLE);
                    nemophila.removeFavoriteFriends(friend.getId());
                    System.out.println(nemophila.getFavoriteFriends());
                }
            }
        };
        friendViewModel.getFriends(uid);  // 自身のフレンドの一覧を取得するメソッドを呼び出す

        friendViewModel.getFriendsLiveData().observe(this, new Observer<Collection<AccountNameJson>>() {
            @Override
            public void onChanged(Collection<AccountNameJson> friends) {
                // 以前のデータが残っていると不都合なので、空にしておく
                friendsDataset.clear();

                for (AccountNameJson friend : friends) {
                    FriendDataModel data = new FriendDataModel();
                    data.setName(friend.getName());
                    data.setId(friend.getUid());

                    //url作る
                    friendIconUrlString = "http://nitta-lab-www.is.konan-u.ac.jp/nemophila-data/icon" + friend.getUid() + ".jpg";
                    data.setUrl(friendIconUrlString);
                    executor.execute(() -> {
                        try{
                            URL url = new URL(data.getUrl());
                            HttpURLConnection con = (HttpURLConnection) url.openConnection();
                            con.connect();

                            InputStream is = con.getInputStream();

                            Bitmap bitmap = BitmapFactory.decodeStream(is);
                            handler.post(() -> {
                                data.setIcon(bitmap);
                                adapter.notifyItemChanged(adapter.getPosition(data));
                            });
                            is.close();
                            con.disconnect();
                        }catch (Exception e){
                            e.printStackTrace();
                        }
                    });
                    friendsDataset.add(data);
                }

                adapter.setList(friendsDataset);
                rv.setAdapter(adapter);
            }
        });


        //idからアカウント名を検索するためのAccountViewModelを宣言しておく
        AccountViewModel accountViewModel = new ViewModelProvider(this).get(AccountViewModel.class);

        //フレンド検索ボタン
        Button requestingButton = findViewById(R.id.requestingSearchButton);
        requestingButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                //入力されたIDを取得
                EditText editSearchId = findViewById(R.id.inputRequestingId);
                searchingId = editSearchId.getText().toString();

                //取得したIDからアカウントを読み込む(検索用のOnChangedへ)
                accountViewModel.fetchAccount(searchingId);
            }
        });

        //検索用LiveDataへの購読
        accountViewModel.getAccountLiveData().observe(FriendActivity.this, new Observer<Account>() {

            //ViewModelからアカウントが返ってくれば(データ変更があれば)実行
            @Override
            public void onChanged(Account user) {
                if(user == null){
                    new AlertDialog.Builder(FriendActivity.this)
                            .setTitle("IDが間違っています")
                            .setPositiveButton("OK", null)
                            .create()
                            .show();
                }else {
                    requestingName = (user.getName());

                    //申請を送るダイアログ
                    RequestingDialogFragment dialog = new RequestingDialogFragment(FriendActivity.this);
                    //名前を渡す
                    Bundle args = new Bundle();
                    args.putString("message", requestingName);
                    dialog.setArguments(args);

                    //ダイアログの表示
                    dialog.show(getSupportFragmentManager(), "Requesting_dialog");
                    //OK押したら申請するメソッドにuid、requestingId、tokenを渡す
                }
            }
        });

        //RecyclerView(表示の設定、直接表示するところはLivedataを購読しているonChanged内に)
        List<RequestingDataModel> requestingDataList = new ArrayList<>();

        //xmlからrvにRecyclerViewを取得
        RecyclerView rv_r = (RecyclerView) findViewById(R.id.requestingList);

        //アダプターを宣言し、削除ボタンを押したときの処理をオーバーライド
        FriendActivity.RequestingAdapter adapter_r = new FriendActivity.RequestingAdapter(requestingDataList){
            @Override
            void onDeleteClick_r(View view, int position, FriendActivity.RequestingDataModel user) {
                new AlertDialog.Builder(FriendActivity.this)
                        .setTitle(user.getName() + "さんへの申請を削除しますか?")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(FriendActivity.this, user.getName(), Toast.LENGTH_SHORT).show();
                                friendViewModel.deleteRequesting(uid, user.getId(), token);
                            }
                        })
                        .setNegativeButton("キャンセル", null)
                        .create()
                        .show();
            }
        };

        //一行ずつを縦に(LinearLayout)表示するLayoutManagerを宣言
        LinearLayoutManager llm_r = new LinearLayoutManager(this);
        //データごとの区切り線を入れる
        RecyclerView.ItemDecoration itemDecoration_r =
                new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
        rv_r.addItemDecoration(itemDecoration_r);

        rv_r.setHasFixedSize(true);
        rv_r.setLayoutManager(llm_r);

        //申請先の一覧のLiveDataへの購読
        friendViewModel.getRequestingLiveData().observe(this, new Observer<Collection<AccountNameJson>>() {
            //データに変更があった時実行
            @Override
            public void onChanged(Collection<AccountNameJson> requestingUsers) {

                //表示用のDataListを一旦クリアし、LiveDataから受け取ったデータを一つずつセット(重複しないように)
                requestingDataList.clear();
                //受け取ったLivedataの要素分繰り返し、セット
                for (AccountNameJson user: requestingUsers) {
                    //dataを宣言　dataに投稿の必要なデータをセットし、それをpostsDatasetに追加してリストを作る
                    RequestingDataModel data = new RequestingDataModel();
                    data.setName(user.getName());
                    data.setId(user.getUid());

                    //url作る
                    requestingIconUrlString = "http://nitta-lab-www.is.konan-u.ac.jp/nemophila-data/icon" + user.getUid() + ".jpg";
                    data.setUrl(requestingIconUrlString);
                    executor.execute(() -> {
                        try{
                            URL url = new URL(data.getUrl());
                            HttpURLConnection con = (HttpURLConnection) url.openConnection();
                            con.connect();

                            InputStream is = con.getInputStream();

                            Bitmap bitmap = BitmapFactory.decodeStream(is);
                            handler.post(() -> {
                                data.setIcon(bitmap);
                                adapter_r.notifyItemChanged(adapter_r.getPosition(data));
                            });
                            is.close();
                            con.disconnect();
                        }catch (Exception e){
                            e.printStackTrace();
                        }
                    });

                    //投稿一つの情報がdataに全部セットされたらDatasetに追加
                    requestingDataList.add(0, data);
                }

                //onChange内に書くべき表示部分
                adapter_r.setList(requestingDataList);
                rv_r.setAdapter(adapter_r);
            }
        });

        // フレンド一覧と申請先一覧の画面切り替え
        showFriend.setOnClickListener(v2 -> {
            friendRecyclerView.setVisibility(View.VISIBLE);
            requestingConstraintLayout.setVisibility(View.INVISIBLE);
            friendViewModel.getFriends(uid);
        });
        showRequesting.setOnClickListener(v3 -> {
            friendRecyclerView.setVisibility(View.INVISIBLE);
            requestingConstraintLayout.setVisibility(View.VISIBLE);
            friendViewModel.getRequesting(uid);
        });

        // MyPageActivityに戻る
        Button closeBtn = findViewById(R.id.close);
        closeBtn.setOnClickListener(d -> finish());
    }

    // ----------- FriendのRecyclerView用の内部クラス ------------//
    // Adapter
    abstract public class FriendActivityAdapter extends RecyclerView.Adapter<FriendsViewHolder> {
        private List<FriendDataModel> friendData;

        public FriendActivityAdapter(List<FriendDataModel> friendData) {
            this.friendData = friendData;
        }

        public int getPosition(FriendDataModel d) {
            return friendData.indexOf(d);
        }

        public void setList(List<FriendDataModel> friendData) {
            this.friendData = friendData;
        }

        @NonNull
        @Override
        public FriendsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int ViewType) {
            // layoutXMLからViewを生成
            View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.friend_list_item, parent,false);
            // ViewHolderを生成
            FriendsViewHolder vh = new FriendsViewHolder(inflate);

            // 削除ボタンを押したときのイベントを登録
            vh.deleteButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int position = vh.getBindingAdapterPosition();
                    // 処理はonDeleteClick()に丸投げ
                    onDeleteClick(v, position, friendData.get(position));
                }
            });

            // お気に入りに追加したときのイベントを登録
            vh.favoriteOutline.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int position = vh.getBindingAdapterPosition();
                    // 処理はonFavoriteClick()に丸投げ
                    onFavoriteClick(v, position, friendData.get(position), vh.favorite);
                }
            });
            return vh;
        }

        @Override
        public void onBindViewHolder(@NonNull FriendsViewHolder holder, int position) {
            // 後からアイコンの登録をできるようにする
            holder.nameView.setText(friendData.get(position).getName());
            holder.iconView.setImageBitmap(friendData.get(position).getIcon());
            if (nemophila.getFavoriteFriends().contains(friendData.get(position).getId())) {
                holder.favorite.setVisibility(View.VISIBLE);
            }
        }

        @Override
        public int getItemCount() {
            return friendData.size();
        }
        abstract void onDeleteClick(View view, int position, FriendDataModel friend);
        abstract void onFavoriteClick(View view, int position, FriendDataModel friend, ImageView favorite);
    }

    // ViewHolder
    public class FriendsViewHolder extends RecyclerView.ViewHolder {
        public ImageView favorite;
        public ImageButton favoriteOutline;
        public ImageView iconView;
        public TextView nameView;
        public Button deleteButton;

        public FriendsViewHolder(@NonNull View itemView) {
            super(itemView);
            favorite = itemView.findViewById(R.id.favorite);
            favoriteOutline = itemView.findViewById(R.id.favorite_outline);
            iconView = itemView.findViewById(R.id.friendIcon);
            nameView = itemView.findViewById(R.id.friendName);
            deleteButton = itemView.findViewById(R.id.friendDelete);
        }
    }

    // DataModel
    public static class FriendDataModel {
        private String name;
        private String id;
        private Bitmap icon;
        private String url;

        public String getName() {
            return name;
        }
        public String getId() {
            return id;
        }
        public Bitmap getIcon() { return icon; }
        public String getUrl() { return url; }

        public void setName(String name) {
            this.name = name;
        }
        public void setId(String id) { this.id = id;}
        public void setIcon(Bitmap icon){ this.icon = icon; }
        public void setUrl(String url) { this.url = url; }
    }

    // ----------- RequestingのRecyclerView用の内部クラス ------------//
    //Adapter
    public class RequestingAdapter extends RecyclerView.Adapter<FriendActivity.RequestingViewHolder> {

        private List<RequestingDataModel> list;

        public RequestingAdapter(List<RequestingDataModel> list) {
            this.list =list;
        }

        public int getPosition(RequestingDataModel d) { return list.indexOf(d); }

        public void setList(List<RequestingDataModel> list) {
            this.list = list;
        }

        @NonNull
        @Override
        public FriendActivity.RequestingViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            //1データあたりのレイアウトを読み込み、ビューホルダーを宣言
            View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_requesting_activity, parent,false);
            FriendActivity.RequestingViewHolder vh = new FriendActivity.RequestingViewHolder(inflate);

            // リスト内の削除ボタンを押した時の処理
            vh.deleteButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int position = vh.getBindingAdapterPosition();
                    // 処理はonDeleteClickに
                    onDeleteClick_r(v, position, list.get(position));
                }
            });

            return vh;
        }

        @Override
        public void onBindViewHolder(@NonNull FriendActivity.RequestingViewHolder holder, int position) {
            holder.nameView.setText(list.get(position).getName());
            holder.iconView.setImageBitmap(list.get(position).getIcon());
        }

        @Override
        public int getItemCount() {
            return list.size();
        }

        void onDeleteClick_r(View view, int position, FriendActivity.RequestingDataModel requesting) {
            // このメソッドをActivity内でオーバーライドして、クリックイベントの処理を設定する
        }
    }

    //ViewHolder
    public class RequestingViewHolder extends RecyclerView.ViewHolder {
        public TextView nameView;
        public ImageView iconView;
        public Button deleteButton;

        public RequestingViewHolder(@NonNull View itemView) {
            super(itemView);
            nameView = itemView.findViewById(R.id.requestingName);
            iconView = itemView.findViewById(R.id.requestingIcon);
            deleteButton = itemView.findViewById(R.id.requestingDeleteButton);
        }
    }

    //DataModel
    public static class RequestingDataModel {
        private String name;
        private String id;
        private Bitmap icon;
        private String url;

        public String getName() {
            return name;
        }
        public String getId() {
            return id;
        }
        public Bitmap getIcon() { return icon; }
        public String getUrl() { return url; }

        public void setName(String name) {
            this.name = name;
        }
        public void setId(String id){
            this.id = id;
        }
        public void setIcon(Bitmap icon) { this.icon = icon; }
        public void setUrl(String url) { this.url = url; }
    }

    //ダイアログでOKを押した時に呼び出される　フレンド申請を送るメソッド
    public void putRequesting(){
        requestingId = searchingId;
        friendViewModel.putRequesting(uid, requestingId, requestingName, token);
    }
}