/*
 * Copyright (C) 2012 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.ide.eclipse.ddms.systrace;

import com.android.ddmuilib.TableHelper;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;

import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;

import java.io.File;
import java.util.List;
import java.util.Set;

public class SystraceOptionsDialogV2 extends TitleAreaDialog implements ISystraceOptionsDialog {
    private static final String TITLE = "Systrace (Android System Trace)";
    private static final String DEFAULT_MESSAGE =
            "Settings to use while capturing system level trace";
    private static final String DEFAULT_TRACE_FNAME = "trace.html"; //$NON-NLS-1$
    private static final Set<String> sCommonTags = ImmutableSet.of(
            "am", "app", "dalvik", "disk", "gfx", "input", "res", "sched", "view", "webview", "wm");

    private Text mDestinationText;
    private String mDestinationPath;
    private Text mTraceDurationText;
    private Text mTraceBufferSizeText;
    private Combo mTraceAppCombo;

    private static String sSaveToFolder = System.getProperty("user.home"); //$NON-NLS-1$
    private static String sTraceDuration = "5";
    private static String sTraceBufferSize = "2048";
    private static Set<String> sEnabledTags = Sets.newHashSet(sCommonTags);
    private static String sLastSelectedApp = null;

    private final List<SystraceTag> mCommonSupportedTags;
    private final List<SystraceTag> mAdvancedSupportedTags;

    private final List<String> mCurrentApps;

    private final SystraceOptions mOptions = new SystraceOptions();
    private Table mCommonTagsTable;
    private Table mAdvancedTagsTable;

    public SystraceOptionsDialogV2(Shell parentShell, List<SystraceTag> tags, List<String> apps) {
        super(parentShell);
        mCurrentApps = apps;

        mCommonSupportedTags = Lists.newArrayListWithExpectedSize(tags.size());
        mAdvancedSupportedTags = Lists.newArrayListWithExpectedSize(tags.size());

        for (SystraceTag supportedTag : tags) {
            if (sCommonTags.contains(supportedTag.tag)) {
                mCommonSupportedTags.add(supportedTag);
            } else {
                mAdvancedSupportedTags.add(supportedTag);
            }
        }
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        setTitle(TITLE);
        setMessage(DEFAULT_MESSAGE);

        Composite c = new Composite(parent, SWT.BORDER);
        c.setLayout(new GridLayout(3, false));
        c.setLayoutData(new GridData(GridData.FILL_BOTH));

        Label l = new Label(c, SWT.NONE);
        l.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
        l.setText("Destination File: ");

        mDestinationText = new Text(c, SWT.BORDER);
        mDestinationText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        mDestinationText.setText(sSaveToFolder + File.separator + DEFAULT_TRACE_FNAME);

        final Button browse = new Button(c, SWT.NONE);
        browse.setText("Browse...");
        browse.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                String path = openBrowseDialog(browse.getShell());
                if (path != null) mDestinationText.setText(path);
            }
        });

        Label lblTraceDurationseconds = new Label(c, SWT.NONE);
        lblTraceDurationseconds.setLayoutData(
                new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
        lblTraceDurationseconds.setText("Trace duration (seconds): ");

        mTraceDurationText = new Text(c, SWT.BORDER);
        mTraceDurationText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
        mTraceDurationText.setText(sTraceDuration);

        Label lblTraceBufferSize = new Label(c, SWT.NONE);
        lblTraceBufferSize.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
        lblTraceBufferSize.setText("Trace Buffer Size (kb): ");

        mTraceBufferSizeText = new Text(c, SWT.BORDER);
        mTraceBufferSizeText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
        mTraceBufferSizeText.setText(sTraceBufferSize);

        Label lblTraceAppName = new Label(c, SWT.NONE);
        lblTraceAppName.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
        lblTraceAppName.setText("Enable Application Traces from: ");

        mTraceAppCombo = new Combo(c, SWT.DROP_DOWN | SWT.READ_ONLY);
        mTraceAppCombo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
        String[] items = new String[mCurrentApps.size() + 1];
        items[0] = "None";
        for (int i = 0; i < mCurrentApps.size(); i++) {
            items[i+1] = mCurrentApps.get(i);
        }
        mTraceAppCombo.setItems(items);
        if (sLastSelectedApp != null) {
            mTraceAppCombo.setText(sLastSelectedApp);
        } else {
            mTraceAppCombo.select(0);
        }

        Label separator = new Label(c, SWT.SEPARATOR | SWT.HORIZONTAL);
        GridData gd = new GridData(GridData.FILL_HORIZONTAL);
        gd.horizontalSpan = 3;
        separator.setLayoutData(gd);

        ModifyListener m = new ModifyListener() {
            @Override
            public void modifyText(ModifyEvent e) {
                validateFields();
            }
        };

        mDestinationText.addModifyListener(m);
        mTraceBufferSizeText.addModifyListener(m);
        mTraceDurationText.addModifyListener(m);

        mCommonTagsTable = createTable(c, "Commonly Used Tags: ", mCommonSupportedTags);
        mAdvancedTagsTable = createTable(c, "Advanced Options: ", mAdvancedSupportedTags);

        return c;
    }

    private Table createTable(Composite c, String label, List<SystraceTag> supportedTags) {
        Label l = new Label(c, SWT.NONE);
        l.setText(label);
        l.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));

        Table table = new Table(c, SWT.CHECK | SWT.BORDER);
        GridData gd = new GridData(GridData.FILL_BOTH);
        gd.horizontalSpan = 2;
        table.setLayoutData(gd);
        table.setHeaderVisible(false);
        table.setLinesVisible(false);

        for (SystraceTag tag : supportedTags) {
            TableItem item = new TableItem(table, SWT.NONE);
            item.setText(tag.info);
            item.setChecked(sEnabledTags.contains(tag.tag));
        }

        TableHelper.createTableColumn(table,
                "TagHeaderNotDisplayed",                //$NON-NLS-1$
                SWT.LEFT,
                "SampleTagForColumnLengthCalculation",  //$NON-NLS-1$
                null,
                null);

        return table;
    }

    private void validateFields() {
        // validate trace destination path
        String msg = validatePath(mDestinationText.getText());
        if (msg != null) {
            setErrorMessage(msg);
            getButton(OK).setEnabled(false);
            return;
        }

        // validate the trace duration
        if (!validateInteger(mTraceDurationText.getText())) {
            setErrorMessage("Trace Duration should be a valid integer (seconds)");
            getButton(OK).setEnabled(false);
            return;
        }

        // validate the trace buffer size
        if (!validateInteger(mTraceBufferSizeText.getText())) {
            setErrorMessage("Trace Buffer Size should be a valid integer (kilobytes)");
            getButton(OK).setEnabled(false);
            return;
        }

        getButton(OK).setEnabled(true);
        setErrorMessage(null);
    }

    private boolean validateInteger(String text) {
        if (text == null || text.isEmpty()) {
            return true;
        }

        try {
            Integer.parseInt(text);
            return true;
        } catch (NumberFormatException e) {
            return false;
        }
    }

    private String validatePath(String path) {
        if (path == null || path.isEmpty()) {
            return null;
        }

        File f = new File(path);
        if (f.isDirectory()) {
            return String.format("The path '%s' points to a folder", path);
        }

        if (!f.exists()) { // if such a file doesn't exist, make sure the parent folder is valid
            if (!f.getParentFile().isDirectory()) {
                return String.format("That path '%s' is not a valid folder.", f.getParent());
            }
        }

        return null;
    }

    private String openBrowseDialog(Shell parentShell) {
        FileDialog fd = new FileDialog(parentShell, SWT.SAVE);

        fd.setText("Save To");
        fd.setFileName(DEFAULT_TRACE_FNAME);

        fd.setFilterPath(sSaveToFolder);
        fd.setFilterExtensions(new String[] { "*.html" }); //$NON-NLS-1$

        String fname = fd.open();
        if (fname == null || fname.trim().length() == 0) {
            return null;
        }

        sSaveToFolder = fd.getFilterPath();
        return fname;
    }

    @Override
    protected void okPressed() {
        mDestinationPath = mDestinationText.getText().trim();

        sTraceDuration = mTraceDurationText.getText();
        if (!sTraceDuration.isEmpty()) {
            mOptions.mTraceDuration = Integer.parseInt(sTraceDuration);
        }

        sTraceBufferSize = mTraceBufferSizeText.getText();
        if (!sTraceBufferSize.isEmpty()) {
            mOptions.mTraceBufferSize = Integer.parseInt(sTraceBufferSize);
        }

        if (mTraceAppCombo.getSelectionIndex() != 0) {
            mOptions.mTraceApp = sLastSelectedApp = mTraceAppCombo.getText();
        }

        sEnabledTags.clear();
        sEnabledTags.addAll(getEnabledTags(mCommonTagsTable, mCommonSupportedTags));
        sEnabledTags.addAll(getEnabledTags(mAdvancedTagsTable, mAdvancedSupportedTags));

        super.okPressed();
    }

    private static Set<String> getEnabledTags(Table table, List<SystraceTag> tags) {
        Set<String> enabledTags = Sets.newHashSetWithExpectedSize(tags.size());

        for (int i = 0; i < table.getItemCount(); i++) {
            TableItem it = table.getItem(i);
            if (it.getChecked()) {
                enabledTags.add(tags.get(i).tag);
            }
        }

        return enabledTags;
    }

    @Override
    public ISystraceOptions getSystraceOptions() {
        return mOptions;
    }

    @Override
    public String getTraceFilePath() {
        return mDestinationPath;
    }

    private class SystraceOptions implements ISystraceOptions {
        private int mTraceBufferSize;
        private int mTraceDuration;
        private String mTraceApp;

        @Override
        public String getTags() {
            return null;
        }

        @Override
        public String getOptions() {
            StringBuilder sb = new StringBuilder(5 * mCommonSupportedTags.size());

            if (mTraceApp != null) {
                sb.append("-a ");   //$NON-NLS-1$
                sb.append(mTraceApp);
                sb.append(' ');
            }

            if (mTraceDuration > 0) {
                sb.append("-t");    //$NON-NLS-1$
                sb.append(mTraceDuration);
                sb.append(' ');
            }

            if (mTraceBufferSize > 0) {
                sb.append("-b ");   //$NON-NLS-1$
                sb.append(mTraceBufferSize);
                sb.append(' ');
            }

            for (String s : sEnabledTags) {
                sb.append(s);
                sb.append(' ');
            }

            return sb.toString().trim();
        }
    }
}