/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.settings.inputmethod;

import static android.view.WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ForegroundColorSpan;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import androidx.fragment.app.DialogFragment;
import androidx.preference.Preference;

import com.android.settings.R;
import com.android.settingslib.Utils;

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

public class ModifierKeysPickerDialogFragment extends DialogFragment {

    private Preference mPreference;
    private String mKeyDefaultName;
    private Context mContext;

    public ModifierKeysPickerDialogFragment() {
    }

    public ModifierKeysPickerDialogFragment(Preference preference) {
        mPreference = preference;
        mKeyDefaultName = preference.getTitle().toString();
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        super.onCreateDialog(savedInstanceState);
        mContext = getActivity();
        String[] modifierKeys = new String[] {
                mContext.getString(R.string.modifier_keys_caps_lock),
                mContext.getString(R.string.modifier_keys_ctrl),
                mContext.getString(R.string.modifier_keys_meta),
                mContext.getString(R.string.modifier_keys_alt)};

        View dialoglayout  =
                LayoutInflater.from(mContext).inflate(R.layout.modifier_key_picker_dialog, null);
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(mContext);
        dialogBuilder.setView(dialoglayout);

        TextView summary = dialoglayout.findViewById(R.id.modifier_key_picker_summary);
        CharSequence summaryText = mContext.getString(
                R.string.modifier_keys_picker_summary, mKeyDefaultName);
        summary.setText(summaryText);

        List<String> list = new ArrayList<>();
        for (int i = 0; i < modifierKeys.length; i++) {
            list.add(modifierKeys[i]);
        }
        ModifierKeyAdapter adapter = new ModifierKeyAdapter(list);
        ListView listView = dialoglayout.findViewById(R.id.modifier_key_picker);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                adapter.setCurrentItem(i);
                adapter.setClick(true);
                adapter.notifyDataSetChanged();
            }
        });

        AlertDialog modifierKeyDialog = dialogBuilder.create();
        Button doneButton = dialoglayout.findViewById(R.id.modifier_key_done_button);
        doneButton.setOnClickListener(v -> {
            String selectedItem = list.get(adapter.getCurrentItem());
            Spannable itemSummary;
            if (selectedItem.equals(mKeyDefaultName)) {
                itemSummary = new SpannableString(
                        mContext.getString(R.string.modifier_keys_default_summary));
                itemSummary.setSpan(
                        new ForegroundColorSpan(getColorOfTextColorSecondary()),
                        0, itemSummary.length(), 0);
                // TODO(b/252812993): remapModifierKey
            } else {
                itemSummary = new SpannableString(selectedItem);
                itemSummary.setSpan(
                        new ForegroundColorSpan(getColorOfColorAccentPrimaryVariant()),
                        0, itemSummary.length(), 0);
            }
            mPreference.setSummary(itemSummary);
            modifierKeyDialog.dismiss();
        });

        Button cancelButton = dialoglayout.findViewById(R.id.modifier_key_cancel_button);
        cancelButton.setOnClickListener(v -> {
            modifierKeyDialog.dismiss();
        });

        final Window window = modifierKeyDialog.getWindow();
        window.setType(TYPE_SYSTEM_DIALOG);

        return modifierKeyDialog;
    }

    class ModifierKeyAdapter extends BaseAdapter {
        private int mCurrentItem = 0;
        private boolean mIsClick = false;
        private List<String> mList;

        ModifierKeyAdapter(List<String> list) {
            this.mList = list;
        }

        @Override
        public int getCount() {
            return mList.size();
        }

        @Override
        public Object getItem(int i) {
            return mList.get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            if (view == null) {
                view = LayoutInflater.from(mContext).inflate(R.layout.modifier_key_item, null);
            }
            TextView textView = view.findViewById(R.id.modifier_key_text);
            ImageView checkIcon = view.findViewById(R.id.modifier_key_check_icon);
            textView.setText(mList.get(i));
            if (mCurrentItem == i && mIsClick) {
                textView.setTextColor(getColorOfColorAccentPrimaryVariant());
                checkIcon.setImageAlpha(255);
            } else {
                textView.setTextColor(getColorOfTextColorPrimary());
                checkIcon.setImageAlpha(0);
            }
            return view;
        }

        public void setCurrentItem(int currentItem) {
            this.mCurrentItem = currentItem;
        }

        public int getCurrentItem() {
            return this.mCurrentItem;
        }

        public void setClick(boolean click) {
            this.mIsClick = click;
        }
    }

    private int getColorOfTextColorPrimary() {
        return Utils.getColorAttrDefaultColor(mContext, android.R.attr.textColorPrimary);
    }

    private int getColorOfTextColorSecondary() {
        return Utils.getColorAttrDefaultColor(mContext, android.R.attr.textColorSecondary);
    }

    private int getColorOfColorAccentPrimaryVariant() {
        return Utils.getColorAttrDefaultColor(
                mContext, com.android.internal.R.attr.colorAccentPrimaryVariant);
    }
}