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package org.solovyev.android.prefs;

import android.content.Context;
import android.util.AttributeSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.solovyev.android.view.DoubleRange;
import org.solovyev.android.view.NumberRange;
import org.solovyev.common.interval.Interval;
import org.solovyev.common.text.Formatter;
import org.solovyev.common.text.NumberIntervalMapper;

import java.text.DecimalFormat;

/**
 * User: serso
 * Date: 8/10/12
 * Time: 1:02 AM
 */
public class DoublePickerDialogPreference extends NumberPickerDialogPreference {

    @NotNull
    private static final Formatter simpleFormatter = new DoubleFormatter(2);

    @NotNull
    @Override
    protected Double getDefaultStep() {
        return 1d;
    }

    @NotNull
    @Override
    protected NumberRange createRange(@NotNull Interval boundaries, @NotNull Double step, @NotNull Double selected) {
        return DoubleRange.newInstance(boundaries.getLeftLimit(), boundaries.getRightLimit(), step, selected, simpleFormatter);
    }

    public DoublePickerDialogPreference(Context context, AttributeSet attrs) {
        super(context, attrs, new NumberIntervalMapper(Double.class));
    }

    private static class DoubleFormatter implements Formatter {

        @NotNull
        private final DecimalFormat df;

        private DoubleFormatter(int numberOfDecimalDigits) {
            final StringBuilder sb = new StringBuilder("#.#");
            for (int i = 1; i < numberOfDecimalDigits; i++) {
                sb.append("#");
            }

            this.df = new DecimalFormat(sb.toString());
        }

        @Override
        public String formatValue(@Nullable Double value) throws IllegalArgumentException {

            if (value == null) {
                return "null";
            } else {
                synchronized (df) {
                    return df.format(value);
                }
            }
        }
    }
}