package eu.faircode.email;

/*
    This file is part of FairEmail.

    FairEmail is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    FairEmail is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2018-2022 by Marcel Bokhorst (M66B)
*/

import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.ColorStateList;
import android.os.Build;
import android.os.Bundle;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.style.ForegroundColorSpan;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.constraintlayout.widget.Group;
import androidx.fragment.app.FragmentTransaction;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import androidx.preference.PreferenceManager;

import org.json.JSONObject;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Locale;

import javax.mail.Address;
import javax.mail.internet.InternetAddress;

public class FragmentDialogJunk extends FragmentDialogBase {
    private static final List<String> COMMON_DOMAINS = Collections.unmodifiableList(Arrays.asList(
            "amazon\\.com",
            "facebook\\.com",
            "google\\.com",
            "microsoft\\.com",
            "twitter\\.com"
    ));

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        final Bundle args = getArguments();
        final long account = args.getLong("account");
        final int protocol = args.getInt("protocol");
        final long folder = args.getLong("folder");
        final String type = args.getString("type");
        final Address[] froms = DB.Converters.decodeAddresses(args.getString("from"));
        final boolean inJunk = args.getBoolean("inJunk");

        final Context context = getContext();
        final View view = LayoutInflater.from(context).inflate(R.layout.dialog_junk, null);
        final TextView tvMessage = view.findViewById(R.id.tvMessage);
        final ImageButton ibInfoProvider = view.findViewById(R.id.ibInfoProvider);
        final CheckBox cbBlockSender = view.findViewById(R.id.cbBlockSender);
        final CheckBox cbBlockDomain = view.findViewById(R.id.cbBlockDomain);
        final ImageButton ibMore = view.findViewById(R.id.ibMore);
        final TextView tvMore = view.findViewById(R.id.tvMore);
        final CheckBox cbJunkFilter = view.findViewById(R.id.cbJunkFilter);
        final ImageButton ibInfoFilter = view.findViewById(R.id.ibInfoFilter);
        final CheckBox cbBlocklist = view.findViewById(R.id.cbBlocklist);
        final TextView tvBlocklist = view.findViewById(R.id.tvBlocklist);
        final ImageButton ibInfoBlocklist = view.findViewById(R.id.ibInfoBlocklist);
        final Button btnClear = view.findViewById(R.id.btnClear);
        final ImageButton ibRules = view.findViewById(R.id.ibRules);
        final ImageButton ibManage = view.findViewById(R.id.ibManage);
        final Group grpInJunk = view.findViewById(R.id.grpInJunk);
        final Group grpMore = view.findViewById(R.id.grpMore);

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        boolean block_sender = prefs.getBoolean("block_sender", true);
        boolean check_blocklist = prefs.getBoolean("check_blocklist", false);
        boolean use_blocklist = prefs.getBoolean("use_blocklist", false);

        boolean canBlock = false;
        if (froms != null && froms.length > 0) {
            String email = ((InternetAddress) froms[0]).getAddress();
            canBlock = !TextUtils.isEmpty(email);
        }

        // Wire controls

        ibInfoProvider.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Helper.viewFAQ(v.getContext(), 92);
            }
        });

        cbBlockSender.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                cbBlockDomain.setEnabled(isChecked && ActivityBilling.isPro(context));
            }
        });

        View.OnClickListener onMore = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (grpMore.getVisibility() == View.VISIBLE) {
                    ibMore.setImageLevel(1);
                    grpMore.setVisibility(View.GONE);
                } else {
                    ibMore.setImageLevel(0);
                    grpMore.setVisibility(View.VISIBLE);
                }
            }
        };

        ibMore.setOnClickListener(onMore);
        tvMore.setOnClickListener(onMore);

        cbJunkFilter.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                args.putBoolean("filter", isChecked);

                new SimpleTask<Void>() {
                    @Override
                    protected Void onExecute(Context context, Bundle args) throws Throwable {
                        long aid = args.getLong("account");
                        long fid = args.getLong("folder");
                        boolean filter = args.getBoolean("filter");

                        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);

                        DB db = DB.getInstance(context);

                        EntityFolder folder = db.folder().getFolder(fid);
                        if (folder == null)
                            return null;

                        EntityFolder junk = db.folder().getFolderByType(aid, EntityFolder.JUNK);
                        if (junk == null)
                            return null;

                        try {
                            db.beginTransaction();

                            db.folder().setFolderDownload(folder.id,
                                    folder.download || filter);
                            db.folder().setFolderAutoClassify(folder.id,
                                    folder.auto_classify_source || filter,
                                    folder.auto_classify_target);

                            db.folder().setFolderDownload(junk.id,
                                    junk.download || filter);
                            db.folder().setFolderAutoClassify(junk.id,
                                    junk.auto_classify_source || filter,
                                    filter);

                            db.setTransactionSuccessful();
                        } finally {
                            db.endTransaction();
                        }

                        prefs.edit().putBoolean("classification", true).apply();

                        return null;
                    }

                    @Override
                    protected void onException(Bundle args, Throwable ex) {
                        Log.unexpectedError(getParentFragmentManager(), ex);
                    }
                }.execute(FragmentDialogJunk.this, args, "junk:filter");
            }
        });

        ibInfoFilter.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Helper.viewFAQ(v.getContext(), 163);
            }
        });

        cbBlocklist.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                prefs.edit()
                        .putBoolean("check_blocklist", isChecked)
                        .putBoolean("use_blocklist", isChecked)
                        .apply();
            }
        });

        ibInfoBlocklist.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Helper.viewFAQ(v.getContext(), 168, true);
            }
        });

        btnClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new AlertDialog.Builder(v.getContext())
                        .setIcon(R.drawable.twotone_warning_24)
                        .setTitle(R.string.title_junk_clear)
                        .setMessage(R.string.title_junk_clear_hint)
                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Bundle args = new Bundle();
                                args.putLong("folder", folder);

                                new SimpleTask<Void>() {
                                    @Override
                                    protected Void onExecute(Context context, Bundle args) throws Throwable {
                                        long fid = args.getLong("folder");

                                        DB db = DB.getInstance(context);
                                        EntityFolder folder = db.folder().getFolder(fid);
                                        if (folder == null)
                                            return null;

                                        EntityFolder junk = db.folder().getFolderByType(folder.account, EntityFolder.JUNK);
                                        if (junk == null)
                                            return null;

                                        List<EntityRule> rules = db.rule().getRules(fid);
                                        if (rules == null)
                                            return null;

                                        for (EntityRule rule : rules) {
                                            JSONObject jaction = new JSONObject(rule.action);
                                            int type = jaction.optInt("type", -1);
                                            long target = jaction.optLong("target", -1);
                                            if (type == EntityRule.TYPE_MOVE && target == junk.id) {
                                                EntityLog.log(context, "Deleting junk rule=" + rule.id);
                                                db.rule().deleteRule(rule.id);
                                            }
                                        }

                                        int count = db.contact().deleteContact(account, EntityContact.TYPE_JUNK);
                                        EntityLog.log(context, "Deleted junk contacts=" + count);

                                        return null;
                                    }

                                    @Override
                                    protected void onExecuted(Bundle args, Void data) {
                                        ToastEx.makeText(getContext(), R.string.title_completed, Toast.LENGTH_LONG).show();
                                    }

                                    @Override
                                    protected void onException(Bundle args, Throwable ex) {
                                        Log.unexpectedError(getParentFragmentManager(), ex);
                                    }
                                }.execute(FragmentDialogJunk.this, args, "junk:clear");
                            }
                        })
                        .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // Do nothing
                            }
                        })
                        .show();
            }
        });

        ibRules.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(v.getContext());
                lbm.sendBroadcast(
                        new Intent(ActivityView.ACTION_EDIT_RULES)
                                .putExtra("account", account)
                                .putExtra("protocol", protocol)
                                .putExtra("folder", folder)
                                .putExtra("type", type));

                dismiss();
            }
        });

        ibManage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Bundle args = new Bundle();
                args.putBoolean("junk", true);

                FragmentContacts fragment = new FragmentContacts();
                fragment.setArguments(args);

                FragmentTransaction fragmentTransaction = getParentFragmentManager().beginTransaction();
                fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("contacts");
                fragmentTransaction.commit();

                dismiss();
            }
        });

        List<String> regex = new ArrayList<>();
        regex.addAll(COMMON_DOMAINS);
        regex.addAll(EmailProvider.getDomainNames(context));

        boolean common = false;
        List<String> domains = new ArrayList<>();
        if (froms != null)
            for (Address from : froms) {
                String email = ((InternetAddress) from).getAddress();
                String domain = UriHelper.getEmailDomain(email);
                if (TextUtils.isEmpty(domain) || domains.contains(domain))
                    continue;

                domains.add(domain);

                for (String r : regex)
                    if (domain.matches(r)) {
                        common = true;
                        break;
                    }
            }

        // Initialize
        if (inJunk)
            tvMessage.setText(R.string.title_folder_junk);
        else {
            String who = MessageHelper.formatAddresses(froms);
            String title = getString(R.string.title_ask_spam_who, who);
            SpannableStringBuilder ssb = new SpannableStringBuilderEx(title);
            if (who.length() > 0) {
                int start = title.indexOf(who);
                if (start > 0) {
                    int textColorPrimary = Helper.resolveColor(context, android.R.attr.textColorPrimary);
                    ssb.setSpan(new ForegroundColorSpan(textColorPrimary), start, start + who.length(), 0);
                }
            }
            tvMessage.setText(ssb);
        }

        cbBlockSender.setEnabled(canBlock);
        cbBlockDomain.setEnabled(false);
        cbBlockSender.setChecked(canBlock && block_sender);

        cbBlockDomain.setText(getString(R.string.title_block_sender_domain, TextUtils.join(",", domains)));
        if (common) {
            int dp6 = Helper.dp2pixels(context, 6);
            int colorWarning = Helper.resolveColor(context, R.attr.colorWarning);
            cbBlockDomain.setTextColor(colorWarning);
            cbBlockDomain.setCompoundDrawablesRelativeWithIntrinsicBounds(0, 0, R.drawable.twotone_warning_24, 0);
            cbBlockDomain.setCompoundDrawablePadding(dp6);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
                cbBlockDomain.setCompoundDrawableTintList(ColorStateList.valueOf(colorWarning));
        }

        cbBlockDomain.setVisibility(domains.size() > 0 ? View.VISIBLE : View.GONE);
        ibMore.setImageLevel(1);
        cbBlocklist.setChecked(check_blocklist && use_blocklist);
        tvBlocklist.setText(TextUtils.join(", ", DnsBlockList.getNamesEnabled(context)));
        grpInJunk.setVisibility(inJunk ? View.GONE : View.VISIBLE);
        grpMore.setVisibility(inJunk ? View.VISIBLE : View.GONE);

        new SimpleTask<Boolean>() {
            @Override
            protected void onPreExecute(Bundle args) {
                cbJunkFilter.setEnabled(false);
            }

            @Override
            protected Boolean onExecute(Context context, Bundle args) {
                long aid = args.getLong("account");
                long fid = args.getLong("folder");

                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
                boolean classification = prefs.getBoolean("classification", false);

                DB db = DB.getInstance(context);
                EntityFolder folder = db.folder().getFolder(fid);
                if (folder == null)
                    return null;

                EntityFolder junk = db.folder().getFolderByType(aid, EntityFolder.JUNK);
                if (junk == null)
                    return null;

                return (classification &&
                        folder.download && folder.auto_classify_source &&
                        junk.download && junk.auto_classify_source && junk.auto_classify_target);
            }

            @Override
            protected void onExecuted(Bundle args, Boolean filter) {
                if (filter != null) {
                    cbJunkFilter.setChecked(filter);
                    cbJunkFilter.setEnabled(true);
                }
            }

            @Override
            protected void onException(Bundle args, Throwable ex) {
                Log.unexpectedError(getParentFragmentManager(), ex);
            }
        }.execute(FragmentDialogJunk.this, args, "junk:filter");

        AlertDialog.Builder builder = new AlertDialog.Builder(context)
                .setView(view)
                .setNegativeButton(android.R.string.cancel, null);

        if (!inJunk)
            builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    prefs.edit().putBoolean("block_sender", cbBlockSender.isChecked()).apply();
                    getArguments().putBoolean("block_sender", cbBlockSender.isChecked());
                    getArguments().putBoolean("block_domain", cbBlockDomain.isChecked());
                    sendResult(Activity.RESULT_OK);
                }
            });

        return builder.create();
    }
}