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package org.jabref.gui.autocompleter;

import java.util.Collection;

import javafx.beans.value.ChangeListener;
import javafx.scene.control.TextInputControl;
import javafx.util.Callback;
import javafx.util.StringConverter;

import org.jabref.gui.util.UiTaskExecutor;

import org.controlsfx.control.textfield.AutoCompletionBinding;

/// Represents a binding between a text input control and an auto-completion popup
/// This class is a slightly modified version of {@link impl.org.controlsfx.autocompletion.AutoCompletionTextFieldBinding}
/// that works with general text input controls instead of just text fields.
public class AutoCompletionTextInputBinding<T> extends AutoCompletionBinding<T> {

    /// String converter to be used to convert suggestions to strings.
    private StringConverter<T> converter;
    private AutoCompletionStrategy inputAnalyzer;
    private final ChangeListener<String> textChangeListener = (_, _, newText) -> {
        if (getCompletionTarget().isFocused()) {
            setUserInputText(newText);
        }
    };
    private boolean showOnFocus;
    private final ChangeListener<Boolean> focusChangedListener = (_, _, newFocused) -> {
        if (newFocused) {
            if (showOnFocus) {
                setUserInputText(getCompletionTarget().getText());
            }
        } else {
            hidePopup();
        }
    };

    /// Creates a new auto-completion binding between the given textInputControl
    /// and the given suggestion provider.
    private AutoCompletionTextInputBinding(final TextInputControl textInputControl,
                                           Callback<ISuggestionRequest, Collection<T>> suggestionProvider) {

        this(textInputControl,
                suggestionProvider,
                AutoCompletionTextInputBinding.defaultStringConverter(),
                new ReplaceStrategy());
    }

    private AutoCompletionTextInputBinding(final TextInputControl textInputControl,
                                           final Callback<ISuggestionRequest, Collection<T>> suggestionProvider,
                                           final StringConverter<T> converter) {
        this(textInputControl, suggestionProvider, converter, new ReplaceStrategy());
    }

    private AutoCompletionTextInputBinding(final TextInputControl textInputControl,
                                           final Callback<ISuggestionRequest, Collection<T>> suggestionProvider,
                                           final StringConverter<T> converter,
                                           final AutoCompletionStrategy inputAnalyzer) {

        super(textInputControl, suggestionProvider, converter);
        this.converter = converter;
        this.inputAnalyzer = inputAnalyzer;

        getCompletionTarget().textProperty().addListener(textChangeListener);
        getCompletionTarget().focusedProperty().addListener(focusChangedListener);
    }

    private static <T> StringConverter<T> defaultStringConverter() {
        return new StringConverter<>() {
            @Override
            public String toString(T t) {
                return t == null ? null : t.toString();
            }

            @SuppressWarnings("unchecked")
            @Override
            public T fromString(String string) {
                return (T) string;
            }
        };
    }

    public static <T> void autoComplete(TextInputControl textArea, Callback<ISuggestionRequest, Collection<T>> suggestionProvider) {
        new AutoCompletionTextInputBinding<>(textArea, suggestionProvider);
    }

    public static <T> void autoComplete(TextInputControl textArea, Callback<ISuggestionRequest, Collection<T>> suggestionProvider, StringConverter<T> converter) {
        new AutoCompletionTextInputBinding<>(textArea, suggestionProvider, converter);
    }

    public static <T> AutoCompletionTextInputBinding<T> autoComplete(TextInputControl textArea, Callback<ISuggestionRequest, Collection<T>> suggestionProvider, StringConverter<T> converter, AutoCompletionStrategy inputAnalyzer) {
        return new AutoCompletionTextInputBinding<>(textArea, suggestionProvider, converter, inputAnalyzer);
    }

    public static <T> AutoCompletionTextInputBinding<T> autoComplete(TextInputControl textArea, Callback<ISuggestionRequest, Collection<T>> suggestionProvider, AutoCompletionStrategy inputAnalyzer) {
        return autoComplete(textArea, suggestionProvider, AutoCompletionTextInputBinding.defaultStringConverter(), inputAnalyzer);
    }

    private void setUserInputText(String newText) {
        if (newText == null) {
            newText = "";
        }
        AutoCompletionInput input = inputAnalyzer.analyze(newText);
        UiTaskExecutor.runInJavaFXThread(() -> setUserInput(input.getUnfinishedPart()));
    }

    @Override
    public TextInputControl getCompletionTarget() {
        return (TextInputControl) super.getCompletionTarget();
    }

    @Override
    public void dispose() {
        getCompletionTarget().textProperty().removeListener(textChangeListener);
        getCompletionTarget().focusedProperty().removeListener(focusChangedListener);
    }

    @Override
    protected void completeUserInput(T completion) {
        String completionText = converter.toString(completion);
        String inputText = getCompletionTarget().getText();
        if (inputText == null) {
            inputText = "";
        }
        AutoCompletionInput input = inputAnalyzer.analyze(inputText);
        String newText = input.getPrefix() + completionText;
        getCompletionTarget().setText(newText);
        getCompletionTarget().positionCaret(newText.length());
    }

    public void setShowOnFocus(boolean showOnFocus) {
        this.showOnFocus = showOnFocus;
    }
}
