/**
 * Copyright (C) 2022 Adrien Hopkins
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package sevenUnitsGUI;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assumptions.assumeTrue;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import org.junit.jupiter.api.Test;

import sevenUnits.unit.BaseDimension;
import sevenUnits.unit.Metric;
import sevenUnits.unit.Unit;
import sevenUnits.unit.UnitValue;
import sevenUnits.utils.Nameable;
import sevenUnits.utils.NamedObjectProduct;

/**
 * @author Adrien Hopkins
 *
 * @since 2022-02-10
 */
public final class PresenterTest {
	static final Set<Unit> testUnits = Set.of(Metric.METRE, Metric.KILOMETRE,
			Metric.METRE_PER_SECOND, Metric.KILOMETRE_PER_HOUR);
	
	static final Set<NamedObjectProduct<BaseDimension>> testDimensions = Set
			.of(Metric.Dimensions.LENGTH, Metric.Dimensions.VELOCITY);
	
	private static final Set<String> names(Set<? extends Nameable> units) {
		return units.stream().map(Nameable::getName).collect(Collectors.toSet());
	}
	
	/**
	 * Test method for {@link Presenter#convertExpressions}
	 * 
	 * @since 2022-02-12
	 */
	@Test
	void testConvertExpressions() {
		// setup
		final ViewBot viewBot = new ViewBot();
		final Presenter presenter = new Presenter(viewBot);
		
		viewBot.setFromExpression("10000.0 m");
		viewBot.setToExpression("km");
		
		// convert expression
		presenter.convertExpressions();
		
		// test result
		final List<UnitConversionRecord> outputs = viewBot
				.expressionConversionList();
		assertEquals("10000.0 m = 10.0 km",
				outputs.get(outputs.size() - 1).toString());
	}
	
	/**
	 * Tests that unit-conversion Views can correctly convert units
	 * 
	 * @since 2022-02-12
	 */
	@Test
	void testConvertUnits() {
		// setup
		final ViewBot viewBot = new ViewBot();
		final Presenter presenter = new Presenter(viewBot);
		
		viewBot.setFromUnitNames(names(testUnits));
		viewBot.setToUnitNames(names(testUnits));
		viewBot.setFromSelection("metre");
		viewBot.setToSelection("kilometre");
		viewBot.setInputValue("10000.0");
		
		// convert units
		presenter.convertUnits();
		
		/*
		 * use result from system as expected - I'm not testing unit conversion
		 * here (that's for the backend tests), I'm just testing that it correctly
		 * calls the unit conversion system
		 */
		final UnitValue expectedInput = UnitValue.of(Metric.METRE, 10000.0);
		final UnitValue expectedOutput = expectedInput
				.convertTo(Metric.KILOMETRE);
		final UnitConversionRecord expectedUC = UnitConversionRecord
				.fromValues(expectedInput, expectedOutput);
		
		assertEquals(List.of(expectedUC), viewBot.unitConversionList());
	}
	
	@Test
	void testDuplicateUnits() {
		assumeTrue(false, "Not yet implemented");
		/*
		 * enable and disable duplicate units and check for those in From and To,
		 * include duplicate units in the input set
		 */
	}
	
	@Test
	void testOneWayConversion() {
		assumeTrue(false, "Not yet implemented");
		/*
		 * enable and disable one-way conversion, testing the units in From and To
		 * on each setting to ensure they match the rule. Include at least one
		 * metric exception.
		 */
	}
	
	/**
	 * Test for {@link Presenter#updateView()}
	 * 
	 * @since 2022-02-12
	 */
	@Test
	void testUpdateView() {
		// setup
		final ViewBot viewBot = new ViewBot();
		final Presenter presenter = new Presenter(viewBot);
		
		// override default database units
		presenter.database.clear();
		for (final Unit unit : testUnits) {
			presenter.database.addUnit(unit.getPrimaryName().orElseThrow(), unit);
		}
		for (final var dimension : testDimensions) {
			presenter.database.addDimension(
					dimension.getPrimaryName().orElseThrow(), dimension);
		}
		
		// set from and to units
		viewBot.setFromUnitNames(names(testUnits));
		viewBot.setToUnitNames(names(testUnits));
		viewBot.setDimensionNames(names(testDimensions));
		viewBot.setSelectedDimensionName(Metric.Dimensions.LENGTH.getName());
		
		// filter to length units only, then get the filtered sets of units
		presenter.updateView();
		final Set<String> fromUnits = viewBot.getFromUnitNames();
		final Set<String> toUnits = viewBot.getToUnitNames();
		
		// test that fromUnits/toUnits is [METRE, KILOMETRE]
		assertEquals(Set.of("metre", "kilometre"), fromUnits);
		assertEquals(Set.of("metre", "kilometre"), toUnits);
	}
}