/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko.toolbar;

import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.speech.RecognizerIntent;
import android.widget.Button;
import android.widget.ImageButton;
import org.mozilla.gecko.ActivityHandlerHelper;
import org.mozilla.gecko.GeckoAppShell;
import org.mozilla.gecko.GeckoSharedPrefs;
import org.mozilla.gecko.R;
import org.mozilla.gecko.Telemetry;
import org.mozilla.gecko.TelemetryContract;
import org.mozilla.gecko.animation.PropertyAnimator;
import org.mozilla.gecko.animation.PropertyAnimator.PropertyAnimationListener;
import org.mozilla.gecko.preferences.GeckoPreferences;
import org.mozilla.gecko.toolbar.BrowserToolbar.OnCommitListener;
import org.mozilla.gecko.toolbar.BrowserToolbar.OnDismissListener;
import org.mozilla.gecko.toolbar.BrowserToolbar.OnFilterListener;
import org.mozilla.gecko.toolbar.BrowserToolbar.TabEditingState;
import org.mozilla.gecko.util.ActivityResultHandler;
import org.mozilla.gecko.util.DrawableUtil;
import org.mozilla.gecko.util.HardwareUtils;
import org.mozilla.gecko.util.StringUtils;
import org.mozilla.gecko.util.InputOptionsUtils;
import org.mozilla.gecko.widget.themed.ThemedLinearLayout;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.ImageView;

import java.util.List;

/**
* {@code ToolbarEditLayout} is the UI for when the toolbar is in
* edit state. It controls a text entry ({@code ToolbarEditText})
* and its matching 'go' button which changes depending on the
* current type of text in the entry.
*/
public class ToolbarEditLayout extends ThemedLinearLayout {

    public interface OnSearchStateChangeListener {
        public void onSearchStateChange(boolean isActive);
    }

    private final ImageView mSearchIcon;

    private final ToolbarEditText mEditText;

    private final ImageButton mVoiceInput;
    private final ImageButton mQrCode;

    private OnFocusChangeListener mFocusChangeListener;

    private boolean showKeyboardOnFocus = false; // Indicates if we need to show the keyboard after the app resumes

    public ToolbarEditLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        setOrientation(HORIZONTAL);

        LayoutInflater.from(context).inflate(R.layout.toolbar_edit_layout, this);
        mSearchIcon = (ImageView) findViewById(R.id.search_icon);

        mEditText = (ToolbarEditText) findViewById(R.id.url_edit_text);

        mVoiceInput = (ImageButton) findViewById(R.id.mic);
        mQrCode = (ImageButton) findViewById(R.id.qrcode);
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();

        if (HardwareUtils.isTablet()) {
            mSearchIcon.setVisibility(View.VISIBLE);
        }

        mEditText.setOnFocusChangeListener(new OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if (mFocusChangeListener != null) {
                    mFocusChangeListener.onFocusChange(ToolbarEditLayout.this, hasFocus);

                    // Checking if voice and QR code input are enabled each time the user taps on the URL bar
                    if (hasFocus) {
                        if (voiceIsEnabled(getContext(), getResources().getString(R.string.voicesearch_prompt))) {
                            mVoiceInput.setVisibility(View.VISIBLE);
                        } else {
                            mVoiceInput.setVisibility(View.GONE);
                        }

                        if (qrCodeIsEnabled(getContext())) {
                            mQrCode.setVisibility(View.VISIBLE);
                        } else {
                            mQrCode.setVisibility(View.GONE);
                        }
                    }
                }
            }
        });

        mEditText.setOnSearchStateChangeListener(new OnSearchStateChangeListener() {
            @Override
            public void onSearchStateChange(boolean isActive) {
                updateSearchIcon(isActive);
            }
        });

        mVoiceInput.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchVoiceRecognizer();
            }
        });

        mQrCode.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchQRCodeReader();
            }
        });

        // Set an inactive search icon on tablet devices when in editing mode
        updateSearchIcon(false);
    }

    /**
     * Update the search icon at the left of the edittext based
     * on its state.
     *
     * @param isActive The state of the edittext. Active is when the initialized
     *         text has changed and is not empty.
     */
    void updateSearchIcon(boolean isActive) {
        if (!HardwareUtils.isTablet()) {
            return;
        }

        // When on tablet show a magnifying glass in editing mode
        final int searchDrawableId = R.drawable.search_icon_active;
        final Drawable searchDrawable;
        if (!isActive) {
            searchDrawable = DrawableUtil.tintDrawableWithColorRes(getContext(), searchDrawableId, R.color.placeholder_grey);
        } else {
            if (isPrivateMode()) {
                searchDrawable = DrawableUtil.tintDrawableWithColorRes(getContext(), searchDrawableId, R.color.tabs_tray_icon_grey);
            } else {
                searchDrawable = getResources().getDrawable(searchDrawableId);
            }
        }

        mSearchIcon.setImageDrawable(searchDrawable);
    }

    @Override
    public void setOnFocusChangeListener(OnFocusChangeListener listener) {
        mFocusChangeListener = listener;
    }

    @Override
    public void setEnabled(boolean enabled) {
        super.setEnabled(enabled);
        mEditText.setEnabled(enabled);
    }

    @Override
    public void setPrivateMode(boolean isPrivate) {
        super.setPrivateMode(isPrivate);
        mEditText.setPrivateMode(isPrivate);
    }

    /**
     * Called when the parent gains focus (on app launch and resume)
     */
    public void onParentFocus() {
        if (showKeyboardOnFocus) {
            showKeyboardOnFocus = false;

            Activity activity = GeckoAppShell.getGeckoInterface().getActivity();
            activity.runOnUiThread(new Runnable() {
                public void run() {
                    mEditText.requestFocus();
                    showSoftInput();
                }
            });
        }

        // Checking if qr code is supported after resuming the app
        if (qrCodeIsEnabled(getContext())) {
            mQrCode.setVisibility(View.VISIBLE);
        } else {
            mQrCode.setVisibility(View.GONE);
        }
    }

    void setToolbarPrefs(final ToolbarPrefs prefs) {
        mEditText.setToolbarPrefs(prefs);
    }

    private void showSoftInput() {
        InputMethodManager imm =
               (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(mEditText, InputMethodManager.SHOW_IMPLICIT);
    }

    void prepareShowAnimation(final PropertyAnimator animator) {
        if (animator == null) {
            mEditText.requestFocus();
            showSoftInput();
            return;
        }

        animator.addPropertyAnimationListener(new PropertyAnimationListener() {
            @Override
            public void onPropertyAnimationStart() {
                mEditText.requestFocus();
            }

            @Override
            public void onPropertyAnimationEnd() {
                showSoftInput();
            }
        });
    }

    void setOnCommitListener(OnCommitListener listener) {
        mEditText.setOnCommitListener(listener);
    }

    void setOnDismissListener(OnDismissListener listener) {
        mEditText.setOnDismissListener(listener);
    }

    void setOnFilterListener(OnFilterListener listener) {
        mEditText.setOnFilterListener(listener);
    }

    void onEditSuggestion(String suggestion) {
        mEditText.setText(suggestion);
        mEditText.setSelection(mEditText.getText().length());
        mEditText.requestFocus();

        showSoftInput();
    }

    void setText(String text) {
        mEditText.setText(text);
    }

    String getText() {
        return mEditText.getText().toString();
    }

    protected void saveTabEditingState(final TabEditingState editingState) {
        editingState.lastEditingText = mEditText.getNonAutocompleteText();
        editingState.selectionStart = mEditText.getSelectionStart();
        editingState.selectionEnd = mEditText.getSelectionEnd();
   }

    protected void restoreTabEditingState(final TabEditingState editingState) {
        mEditText.setText(editingState.lastEditingText);
        mEditText.setSelection(editingState.selectionStart, editingState.selectionEnd);
    }

    private boolean voiceIsEnabled(Context context, String prompt) {
        final boolean voiceIsSupported = InputOptionsUtils.supportsVoiceRecognizer(context, prompt);
        if (!voiceIsSupported) {
            return false;
        }
        return GeckoSharedPrefs.forApp(context)
                .getBoolean(GeckoPreferences.PREFS_VOICE_INPUT_ENABLED, true);
    }

    private void launchVoiceRecognizer() {
        Telemetry.sendUIEvent(TelemetryContract.Event.ACTION, TelemetryContract.Method.ACTIONBAR, "voice_input_launch");
        final Intent intent = InputOptionsUtils.createVoiceRecognizerIntent(getResources().getString(R.string.voicesearch_prompt));

        Activity activity = GeckoAppShell.getGeckoInterface().getActivity();
        ActivityHandlerHelper.startIntentForActivity(activity, intent, new ActivityResultHandler() {
            @Override
            public void onActivityResult(int resultCode, Intent data) {
                if (resultCode != Activity.RESULT_OK) {
                    return;
                }

                Telemetry.sendUIEvent(TelemetryContract.Event.ACTION, TelemetryContract.Method.ACTIONBAR, "voice_input_success");
                // We have RESULT_OK, not RESULT_NO_MATCH so it should be safe to assume that
                // we have at least one match. We only need one: this will be
                // used for showing the user search engines with this search term in it.
                List<String> voiceStrings = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                String text = voiceStrings.get(0);
                mEditText.setText(text);
                mEditText.setSelection(0, text.length());

                final InputMethodManager imm =
                        (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.showSoftInput(mEditText, InputMethodManager.SHOW_IMPLICIT);
            }
        });
    }

    private boolean qrCodeIsEnabled(Context context) {
        final boolean qrCodeIsSupported = InputOptionsUtils.supportsQrCodeReader(context);
        if (!qrCodeIsSupported) {
            return false;
        }
        return GeckoSharedPrefs.forApp(context)
                .getBoolean(GeckoPreferences.PREFS_QRCODE_ENABLED, true);
    }

    private void launchQRCodeReader() {
        Telemetry.sendUIEvent(TelemetryContract.Event.ACTION, TelemetryContract.Method.ACTIONBAR, "qrcode_input_launch");
        final Intent intent = InputOptionsUtils.createQRCodeReaderIntent();

        Activity activity = GeckoAppShell.getGeckoInterface().getActivity();
        ActivityHandlerHelper.startIntentForActivity(activity, intent, new ActivityResultHandler() {
            @Override
            public void onActivityResult(int resultCode, Intent intent) {
                if (resultCode == Activity.RESULT_OK) {
                    String text = intent.getStringExtra("SCAN_RESULT");
                    if (!StringUtils.isSearchQuery(text, false)) {
                        Telemetry.sendUIEvent(TelemetryContract.Event.ACTION, TelemetryContract.Method.ACTIONBAR, "qrcode_input_success");
                        mEditText.setText(text);
                        mEditText.selectAll();

                        // Queuing up the keyboard show action.
                        // At this point the app has not resumed yet, and trying to show
                        // the keyboard will fail.
                        showKeyboardOnFocus = true;
                    }
                }
                // We can get the SCAN_RESULT_FORMAT, SCAN_RESULT_BYTES,
                // SCAN_RESULT_ORIENTATION and SCAN_RESULT_ERROR_CORRECTION_LEVEL
                // as well as the actual result, which may hold a URL.
            }
        });
    }
}