/*
 * Copyright (C) 2023 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.devicelockcontroller.activities;

import android.content.Context;
import android.content.Intent;
import android.text.Html;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.text.style.URLSpan;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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

import com.android.devicelockcontroller.R;

/**
 * A {@link androidx.recyclerview.widget.RecyclerView.ViewHolder} class which describes the item
 * views used in the {@link RecyclerView}
 */
final class DevicePolicyGroupViewHolder extends RecyclerView.ViewHolder {

    private static final String TAG = "DevicePolicyGroupViewHolder";

    private final TextView mGroupTitleTextView;
    private final ViewGroup mDevicePolicyItems;

    DevicePolicyGroupViewHolder(View iteView) {
        super(iteView);
        mGroupTitleTextView = iteView.findViewById(R.id.text_view_device_policy_group_title);
        mDevicePolicyItems = iteView.findViewById(R.id.device_policy_items);
    }

    void bind(DevicePolicyGroup devicePolicyGroup, int maxDevicePolicy, String providerName) {
        Context context = itemView.getContext();
        mGroupTitleTextView.setText(
                context.getString(devicePolicyGroup.getGroupTitleTextId(), providerName));
        for (int i = 0; i < devicePolicyGroup.getDevicePolicyList().size(); ++i) {
            TextView devicePolicyItemView = (TextView) mDevicePolicyItems.getChildAt(i);
            DevicePolicy devicePolicy = devicePolicyGroup.getDevicePolicyList().get(i);
            String policyText = context.getString(devicePolicy.getTextId(), providerName);
            SpannableString text =
                    new SpannableString(Html.fromHtml(policyText, Html.FROM_HTML_MODE_COMPACT));
            if (handleUrlSpan(text)) {
                devicePolicyItemView.setMovementMethod(LinkMovementMethod.getInstance());
            }
            devicePolicyItemView.setText(text);
            devicePolicyItemView.setCompoundDrawablesRelativeWithIntrinsicBounds(
                    devicePolicy.getDrawableId(),
                    /* top=*/ 0,
                    /* end=*/ 0,
                    /* bottom=*/ 0);
            devicePolicyItemView.setVisibility(View.VISIBLE);
        }
        // not every DevicePolicyGroup has the maximum number of DevicePolicy, hide the extra views
        for (int i = devicePolicyGroup.getDevicePolicyList().size(); i < maxDevicePolicy; ++i) {
            TextView devicePolicyItemView = (TextView) mDevicePolicyItems.getChildAt(i);
            devicePolicyItemView.setVisibility(View.GONE);
        }
    }

    private boolean handleUrlSpan(SpannableString text) {
        boolean hasUrl = false;
        URLSpan[] spans = text.getSpans(0, text.length(), URLSpan.class);
        for (URLSpan span : spans) {
            int start = text.getSpanStart(span);
            int end = text.getSpanEnd(span);
            ClickableSpan clickableSpan = new CustomClickableSpan(span.getURL());
            text.removeSpan(span);
            text.setSpan(clickableSpan, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            hasUrl = true;
        }
        return hasUrl;
    }

    /**
     * A custom clickable span to open URL as a web intent.
     */
    private static final class CustomClickableSpan extends ClickableSpan {
        final String mUrl;

        CustomClickableSpan(String url) {
            mUrl = url;
        }

        @Override
        public void onClick(@NonNull View view) {
            Context context = view.getContext();
            Intent webIntent = new Intent(context, HelpActivity.class);
            webIntent.putExtra(HelpActivity.EXTRA_URL_PARAM, mUrl);
            context.startActivity(webIntent);
        }
    }
}