package com.example.citrusclient.views;

import android.graphics.Color;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

import com.example.citrusclient.Citrus;
import com.example.citrusclient.R;
import com.example.citrusclient.models.Book;
import com.example.citrusclient.models.Schedule;
import com.example.citrusclient.viewmodels.BooksViewModel;
import com.example.citrusclient.viewmodels.ScheduleViewModel;
import com.google.android.material.floatingactionbutton.FloatingActionButton;

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.YearMonth;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link CalendarFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class CalendarFragment extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;


    private TableLayout tableLayout;
    private TableRow[] tableRows = new TableRow[6];

    public CalendarFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment ScheduleFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static CalendarFragment newInstance(String param1, String param2) {
        CalendarFragment fragment = new CalendarFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }

        scheduleViewModel = new ViewModelProvider(this).get(ScheduleViewModel.class);
        booksViewModel = new ViewModelProvider(this).get(BooksViewModel.class);

        schedules = new HashMap<>();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_calendar, container, false);
    }


    BooksViewModel booksViewModel;
    private List<Schedule> scheduleList;
    ScheduleViewModel scheduleViewModel;
    private HashMap<Integer, Book> integerBookHashMap;

    int year;
    int month;
    int day;

    HashMap<Integer, HashMap<Integer, Schedule>> schedules;

    public TextView[][] calendar(int firstDayOfWeek, int prevMonthDay, int lastDay) {
        int curDay = 1;
        int d = 1;
        int prevDay = prevMonthDay - firstDayOfWeek;
        TextView textViews[][] = new TextView[6][7];
        if(firstDayOfWeek == 7) firstDayOfWeek = 0;
        for(int i = 0; i < 6; i++) {
            for(int j = 0; j < 7; j++){
                if(firstDayOfWeek > 0) {
                    prevDay++;
                    textViews[i][j] = new TextView(requireContext());
                    textViews[i][j].setTextColor(Color.GRAY);
                    textViews[i][j].setText("" + prevDay);
                    firstDayOfWeek--;
                } else if(firstDayOfWeek <= 0 && curDay <= lastDay) {
                    textViews[i][j] = new TextView(requireContext());
                    textViews[i][j].setText("" + curDay);
                    curDay++;
                } else if (curDay > lastDay && d <= 43-curDay) {
                    textViews[i][j] = new TextView(requireContext());
                    textViews[i][j].setTextColor(Color.GRAY);
                    textViews[i][j].setText("" + d);
                    d++;
                }
            }
        }
        return textViews;
    }

    public String[][] calendarString(int firstDayOfWeek, int prevMonthDay, int lastDay) {
        int curDay = 1;
        int d = 1;
        int prevDay = prevMonthDay - firstDayOfWeek;
        String[][] textViews = new String[6][7];
        if(firstDayOfWeek == 7) firstDayOfWeek = 0;
        for(int i = 0; i < 6; i++) {
            for(int j = 0; j < 7; j++){
                if(firstDayOfWeek > 0) {
                    prevDay++;
                    textViews[i][j] = ("" + prevDay);
                    firstDayOfWeek--;
                } else if(firstDayOfWeek <= 0 && curDay <= lastDay) {
                    textViews[i][j] = ("" + curDay);
                    curDay++;
                } else if (curDay > lastDay && d <= 43-curDay) {
                    textViews[i][j] = ("" + d);
                    d++;
                }
            }
        }
        return textViews;
    }

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

        //AdapterはそれぞれのRecyclerViewに入れる必要があるため、for文を用いて、それぞれにセットする。(後期の作業)

        Citrus citrus = (Citrus)(getActivity().getApplication());
        String token = citrus.getToken();
        String accountId = citrus.getAccountId();

        scheduleViewModel.getSchedulesByMonth().observe(getViewLifecycleOwner(), new Observer<HashMap<Integer, HashMap<Integer, Schedule>>>() {
            @Override
            public void onChanged(HashMap<Integer, HashMap<Integer, Schedule>> integerHashMapHashMap) {
                TextView curMonth = view.findViewById(R.id.month);
                schedules = integerHashMapHashMap;
                updateCalendar(curMonth);
            }
        });


        tableLayout =  view.findViewById(R.id.calendarlayout);
        Calendar calendar = Calendar.getInstance();
        year = calendar.get(Calendar.YEAR); //現在の年
        month = calendar.get(Calendar.MONTH) + 1; //現在の月

        scheduleViewModel.updateSchedulesByMonth(accountId, year, month, token);

        //現在の月の最後の日付を取得
        YearMonth yearMonth = YearMonth.of(year, month);
        LocalDate CurLastDay = yearMonth.atEndOfMonth();
        int lastDay = CurLastDay.getDayOfMonth();

        //前の月の最後の日付を取得
        LocalDate lastDate = LocalDate.of(year, month, 1);
        LocalDate lastDayPrevMonth = lastDate.minusDays(1);
        int prevMonthDay = lastDayPrevMonth.getDayOfMonth();

        //指定した年月の一日の曜日を取得
        LocalDate firstDay = LocalDate.of(year, month, 1);
        DayOfWeek dayOfWeek = firstDay.getDayOfWeek();
        int firstDayOfWeek = dayOfWeek.getValue();

        Button nextMonth = view.findViewById(R.id.nextMonth);
        Button prevMonth = view.findViewById(R.id.prevMonth);
        FloatingActionButton createBook = view.findViewById(R.id.floatingActionButton);
        TextView curMonth = view.findViewById(R.id.month);
        curMonth.setText(year + "年" + month + "月");

        createBook.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((MainActivity) getActivity()).showFragment(new CreateScheduleFragment());
            }
        });

        //カレンダーの次の月を表示
        nextMonth.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                month++;
                if(month > 12){
                    month = 1;
                    year++;
                }
                scheduleViewModel.updateSchedulesByMonth(accountId, year, month, token);

            }
        });

        //カレンダーの前の月を表示
        prevMonth.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                month--;
                if(month < 1) {
                    month = 12;
                    year--;
                }
                scheduleViewModel.updateSchedulesByMonth(accountId, year, month, token);
            }
        });

        //カレンダーの初期表示
        TableLayout tableLayout = view.findViewById(R.id.calendarlayout);
        TextView[][] days = calendar(firstDayOfWeek, prevMonthDay, lastDay);
        String[][] daysString = calendarString(firstDayOfWeek, prevMonthDay, lastDay);
        for(int i = 0; i < 6; i++) {
            TableRow tableRow = (TableRow) tableLayout.getChildAt(i);
            for(int j = 0; j < 7; j++) {
                LinearLayout layout = new LinearLayout(requireContext());
                layout.setOrientation(LinearLayout.VERTICAL);
                layout.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.MATCH_PARENT));
                TableRow.LayoutParams p2 = (TableRow.LayoutParams) layout.getLayoutParams();
                p2.weight = 1;
                tableRow.addView(layout);
                layout.addView(days[i][j]);
                RecyclerView recyclerView = new RecyclerView(requireContext());
                RecyclerView.LayoutManager layoutmanager = new LinearLayoutManager(requireContext());
                recyclerView.setLayoutManager(layoutmanager);

                List<Schedule> schedules = new ArrayList<>();

                recyclerView.setAdapter(new MyScheduleAdapter(schedules, integerBookHashMap));
                layout.addView(recyclerView);
                layout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                                LinearLayout.LayoutParams.MATCH_PARENT,
                                layout.getHeight()
                        );
                        layout.getChildAt(1).setLayoutParams(layoutParams);
                        layout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                    }
                });

            }
        }
    }

    //カレンダーの更新
    private void updateCalendar(TextView curMonth){
        curMonth.setText(year + "年" + month + "月");
        //指定した年月の一日の曜日を取得
        LocalDate firstDay = LocalDate.of(year, month, 1);
        DayOfWeek dayOfWeek = firstDay.getDayOfWeek();
        int firstDayOfWeek = dayOfWeek.getValue();
        //前の月の最後の日付を取得
        LocalDate lastDate = LocalDate.of(year, month, 1);
        LocalDate lastDayPrevMonth = lastDate.minusDays(1);
        int prevMonthDay = lastDayPrevMonth.getDayOfMonth();
        //現在の月の最後の日付を取得
        YearMonth yearMonth = YearMonth.of(year, month);
        LocalDate CurLastDay = yearMonth.atEndOfMonth();
        int lastDay = CurLastDay.getDayOfMonth();

        String[][] days = calendarString(firstDayOfWeek, prevMonthDay, lastDay);

        for(int i = 0; i < 6; i++) {
            TableRow tableRow = (TableRow) tableLayout.getChildAt(i);
            for(int j = 0; j < 7; j++) {
                LinearLayout layout = (LinearLayout) tableRow.getChildAt(j);
                RecyclerView recyclerView = (RecyclerView) layout.getChildAt(1);
                List<Schedule> schedules = new ArrayList<>();
                if(this.schedules != null) {
                    if (this.schedules.get(Integer.parseInt(days[i][j])) != null) {
                        for (Schedule schedule : this.schedules.get(Integer.parseInt(days[i][j])).values()) {
                            schedules.add(schedule);
                        }
                    }
                }

                ((MyScheduleAdapter) recyclerView.getAdapter()).setSchedules(schedules, integerBookHashMap);
                ((TextView) layout.getChildAt(0)).setText(days[i][j]);
                //if(i == 2 && j == 1) Log.i("kjda", layout.getLayoutParams().height + "");
            }
        }
    }
}

class MyScheduleAdapter extends RecyclerView.Adapter<MyScheduleAdapter.MyScheduleViewHolder> {

    private List<Schedule> scheduleList;
    private HashMap<Integer, Book> integerBookHashMap;

    MyScheduleAdapter(List<Schedule> schedules, HashMap<Integer, Book> integerBookHashMap) {
        this.scheduleList = schedules;
        if(integerBookHashMap != null) {
            this.integerBookHashMap = new HashMap<>(integerBookHashMap);
        } else {
            this.integerBookHashMap = new HashMap<>();
        }
    }

    public void setSchedules(List<Schedule> schedules, HashMap<Integer, Book> integerBookHashMap) {
        scheduleList = schedules;
        if(integerBookHashMap != null) {
            this.integerBookHashMap = new HashMap<>(integerBookHashMap);
        } else {
            this.integerBookHashMap = new HashMap<>();
        }
        notifyDataSetChanged();
    }
    @NonNull
    @Override
    public MyScheduleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.a_calendar_schedule, parent, false);
        return new MyScheduleViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyScheduleViewHolder holder, int position) {
        int red = 169;
        int green = 169;
        int blue = 169;
        Schedule scheduleData = this.scheduleList.get(position);
        holder.scheduleText.setText(scheduleData.getTitle());
        Book book = integerBookHashMap.get(scheduleData.getBookId());
        if(book != null) {
            red = Integer.parseInt(book.getColor().substring(1, 3), 16);
            green = Integer.parseInt(book.getColor().substring(3, 5), 16);
            blue = Integer.parseInt(book.getColor().substring(5, 7), 16);
        }
        holder.scheduleText.setBackgroundColor(Color.rgb(red, green, blue));
        holder.scheduleText.setTextColor(Color.rgb(255-red, 255-green, 255-blue));
    }

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

    static class MyScheduleViewHolder extends RecyclerView.ViewHolder {
        TextView scheduleText;
        public MyScheduleViewHolder(@NonNull View itemView) {
            super(itemView);
            scheduleText = itemView.findViewById(R.id.schedule_text);
        }
    }
}