// This file (UnitRequiresAtLeastNUnitsRequirement.cs) is a part of the IBBoard.WarFoundry.API.Tests project and is copyright 2011 IBBoard
// 
// The file and the library/program it is in are licensed and distributed, without warranty, under the GNU Affero GPL license, either version 3 of the License or (at your option) any later version. Please see COPYING for more information and the full license.
using System;
using NUnit.Framework;
using IBBoard.WarFoundry.API.Objects.Mock;
using NUnit.Framework.SyntaxHelpers;

namespace IBBoard.WarFoundry.API.Objects.Requirement
{
	[TestFixture()]
	public class UnitRequiresAtLeastNUnitsRequirementTest
	{
		private MockRace mockRace;
		private UnitType unitType1;
		private UnitType unitType2;
		private UnitType unitType3;

		[TestFixtureSetUp()]
		public void SetupRace()
		{
			mockRace = new MockRace();
			unitType1 = new MockUnitType("type1", "Unit Type 1");
			mockRace.AddUnitType(unitType1);
			unitType2 = new MockUnitType("type2", "Unit Type 2");
			mockRace.AddUnitType(unitType2);
			unitType3 = new MockUnitType("type3", "Unit Type 3");
			mockRace.AddUnitType(unitType3);
		}

		[Test()]
		public void TestAddingUnitWithNoUnitsAndOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			Unit unit = CreateUnitOfType(unitType1, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.AllowsAdding(unit, army), Is.EqualTo(Validation.Failed));
		}

		[Test()]
		public void TestAddingUnitWithOneUnitAndOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			Unit unit = CreateUnitOfType(unitType1, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.AllowsAdding(unit, army), Is.EqualTo(Validation.Passed));
		}

		[Test()]
		public void TestAddingUnitTypeWithNoUnitsAndOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Failed));
		}

		[Test()]
		public void TestAddingUnitTypeWithOneUnitAndOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Passed));
		}

		[Test()]
		public void TestAddingUnitTypeWithNoUnitsAndTwoUnitTypesRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			req.AddUnitTypeRequirement(unitType3);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Failed));
		}

		[Test()]
		public void TestAddingUnitTypeWithOneUnitAndTwoUnitTypesRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			req.AddUnitTypeRequirement(unitType3);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Failed));
		}

		[Test()]
		public void TestAddingUnitTypeWithBothUnitsAndTwoUnitTypesRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			AddUnitOfTypeToArmy(unitType3, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			req.AddUnitTypeRequirement(unitType3);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Passed));
		}

		[Test()]
		public void TestAddingUnitTypeWithOneUnitAndTwoOfOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2, 2);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Failed));
		}

		[Test()]
		public void TestAddingUnrelatedUnitTypeIsAllowedWhenRequirementsNotMet()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2, 2);
			Assert.That(req.AllowsAdding(unitType3, army), Is.EqualTo(Validation.NotApplicable));
		}

		[Test()]
		public void TestAddingUnitTypeWithTwoUnitsAndTwoOfOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			AddUnitOfTypeToArmy(unitType2, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2, 2);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Passed));
		}

		[Test()]
		public void TestAddingUnitTypeRequirementWithNoNumberDefaultsToHavingOne()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.AllowsAdding(unitType1, army), Is.EqualTo(Validation.Passed));
		}

		[Test()]
		public void TestValidityOfArmyWithNoUnitsAndOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType1, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.ValidatesArmy(army), Is.EqualTo(Validation.Failed));
		}

		[Test()]
		public void TestValidityOfArmyWithOneUnitAndOneUnitTypeRequired()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			AddUnitOfTypeToArmy(unitType1, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.ValidatesArmy(army), Is.EqualTo(Validation.Passed));
		}

		[Test()]
		public void TestValidityOfArmyWhenNoRequireeAndRequirementNotMet()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType2, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2, 2);
			Assert.That(req.ValidatesArmy(army), Is.EqualTo(Validation.NotApplicable));
		}

		[Test]
		public void TestSatisfyingRequirementChangesResult()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType1, army);
			UnitRequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2);
			Assert.That(req.ValidatesArmy(army), Is.EqualTo(Validation.Failed));
			AddUnitOfTypeToArmy(unitType2, army);
			Assert.That(req.ValidatesArmy(army), Is.EqualTo(Validation.Passed));
		}

		[Test]
		public void TestAddingMinNumberUnitTypePassesRequirement()
		{
			Army army = new Army(mockRace, "Test", 1000);
			AddUnitOfTypeToArmy(unitType1, army);
			RequiresAtLeastNUnitsRequirement req = new UnitRequiresAtLeastNUnitsRequirement(unitType1);
			req.AddUnitTypeRequirement(unitType2, 2);
			Assert.That(req.AllowsAdding(unitType2, army), Is.EqualTo(Validation.Failed));
			AddUnitOfTypeToArmy(unitType2, army);
			Assert.That(req.AllowsAdding(unitType2, army), Is.EqualTo(Validation.Passed));
		}


		private static void AddUnitOfTypeToArmy(UnitType unitType, Army army)
		{
			army.AddUnit(CreateUnitOfType(unitType, army));
		}


		private static Unit CreateUnitOfType(UnitType unitType, Army army)
		{
			return new Unit(unitType, army.GetCategory(unitType.MainCategory));
		}
	}
}