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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package test.javafx.binding;

import static test.javafx.binding.DependencyUtils.checkDependencies;
import javafx.beans.binding.Binding;
import javafx.beans.binding.Bindings;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.value.ObservableValue;
import javafx.beans.value.WritableValue;

import org.junit.Before;
import org.junit.Test;

public abstract class WhenTestBase<T, P extends WritableValue<T> & ObservableValue<T>> {

    static final float EPSILON_FLOAT = 1e-6f;
    static final double EPSILON_DOUBLE = 1e-10;

    public abstract Binding<T>[] generatePropertyPropertyList(P p0, P[] properties);

    public abstract Binding<T> generatePropertyProperty(P p0, P p1);

    public abstract Binding<T>[] generatePropertyPrimitive(P op0, T op1);

    public abstract Binding<T>[] generatePrimitiveProperty(T op0, P op1);

    public abstract Binding<T>[] generatePrimitivePrimitive(T op0, T op1);

    public abstract void check(T expected, Binding<T> binding);

    final BooleanProperty cond = new SimpleBooleanProperty();
    final P p0;
    final P[] properties;
    private final T v0;
    private final T v1;
    private final T v2;
    private final T v3;

    public WhenTestBase(T v0, T v1, T v2, T v3, P p0, P... properties) {
    	this.v0 = v0;
    	this.v1 = v1;
    	this.v2 = v2;
    	this.v3 = v3;
    	this.p0 = p0;
    	this.properties = properties;
    }

    @Before
    public void setUp() {
        cond.set(false);
        p0.setValue(v0);
        for (final P p : properties) {
        	p.setValue(v1);
        }
    }

    @Test
    public void test_expression_expression() {
        final Binding<T>[] bindings = generatePropertyPropertyList(p0, properties);
        final int n = bindings.length;
        for (int i=0; i<n; i++) {
        	final Binding<T> binding = bindings[i];
        	final P p1 = properties[i];
            // check initial state
	        checkDependencies(binding.getDependencies(), cond, p0, p1);
	        check(p1.getValue(), binding);
	
	        // set first value
	        p0.setValue(v2);
	        check(p1.getValue(), binding);
	
	        // set second value
	        p1.setValue(v3);
	        check(p1.getValue(), binding);
	
	        // change condition
	        cond.set(true);
	        check(v2, binding);
	
	        // set first value
	        p0.setValue(v0);
	        check(v0, binding);
	
	        // set second value
	        p1.setValue(v1);
	        check(v0, binding);
	
	        // change condition
	        cond.set(false);
	        check(p1.getValue(), binding);
        }
    }

    @Test
    public void test_expression_primitive() {
        final Binding<T>[] bindings = generatePropertyPrimitive(p0, v1);
        for (final Binding<T> binding : bindings) {
	        // check initial state
	        checkDependencies(binding.getDependencies(), cond, p0);
	        check(v1, binding);
	
	        // set first value
	        p0.setValue(v2);
	        check(v1, binding);
	
	        // change condition
	        cond.set(true);
	        check(v2, binding);
	
	        // set first value
	        p0.setValue(v0);
	        check(v0, binding);
	
	        // change condition
	        cond.set(false);
	        check(v1, binding);
        }
    }

    @Test
    public void test_primitive_expression() {
        final Binding<T>[] bindings = generatePrimitiveProperty(v1, p0);
        for (final Binding<T> binding : bindings) {
	        // check initial state
	        checkDependencies(binding.getDependencies(), cond, p0);
	        check(v0, binding);
	
	        // set second value
	        p0.setValue(v3);
	        check(v3, binding);
	
	        // change condition
	        cond.set(true);
	        check(v1, binding);
	
	        // set second value
	        p0.setValue(v0);
	        check(v1, binding);
	
	        // change condition
	        cond.set(false);
	        check(v0, binding);
        }
    }

    @Test
    public void test_primitive_primitive() {
        final Binding<T>[] bindings = generatePrimitivePrimitive(v0, v1);
        for (final Binding<T> binding : bindings) {
	        // check initial state
	        checkDependencies(binding.getDependencies(), cond);
	        check(v1, binding);
	
	        // change condition
	        cond.set(true);
	        check(v0, binding);
	
	        // change condition
	        cond.set(false);
	        check(v1, binding);
        }
    }

    @Test(expected=NullPointerException.class)
    public void test_Null() {
        Bindings.when(null);
    }

    @Test(expected=NullPointerException.class)
    public void test_Null_expression() {
        generatePropertyProperty(null, p0);
    }

    @Test(expected=NullPointerException.class)
    public void test_expression_Null() {
        generatePropertyProperty(p0, null);
    }

    @Test(expected=NullPointerException.class)
    public void test_Null_primitive() {
        generatePropertyPrimitive(null, v1);
    }

    @Test(expected=NullPointerException.class)
    public void test_primitive_Null() {
        generatePrimitiveProperty(v0, null);
    }
}