using Core.Calculation;
using Core.Entities;
using Core.Models;
using Tests.Builders;
using Tests.Fixtures;
using EventAssignment = Core.Calculation.EventAssignment;

namespace Tests.Calculation;

[TestFixture]
public class EventAssignmentTests
{
	[SetUp]
	public void SetUp()
	{
		BuilderExtensions.ResetAllBuilders();
	}

	[Test]
	public async Task SolutionTest()
	{
		// Create custom test data with sufficient rankings for EventAssignment
		// Need enough events and rankings to satisfy the default parameters:
		// - 2-4 events per student
		// - 6-8 effort points per student
		// - At least 1 regional event
		// - At least 1 on-site activity

		var flight = EventDefinitionBuilder.Individual("Flight").AsRegionalEvent().Build();
		var coding = EventDefinitionBuilder.Individual("Coding").AsRegionalEvent().Build();
		var speech = EventDefinitionBuilder.Individual("Prepared Speech").AsOnSite().Build();
		var photo = EventDefinitionBuilder.Individual("Digital Photography").Build();
		var essays = EventDefinitionBuilder.Individual("Essays on Technology").Build();

		var robotics = EventDefinitionBuilder.Team("Robotics", 2, 5).AsRegionalEvent().AsOnSite().Build();
		var biotech = EventDefinitionBuilder.Team("Biotechnology", 2, 6).AsRegionalEvent().Build();
		var webDesign = EventDefinitionBuilder.Team("Website Design", 3, 6).Build();
		var videoGame = EventDefinitionBuilder.Team("Video Game Design", 2, 6).Build();
		var engineering = EventDefinitionBuilder.Team("Engineering Design", 3, 6).AsOnSite().Build();

		var events = new[] { flight, coding, speech, photo, essays, robotics, biotech, webDesign, videoGame, engineering };

		// Create students with diverse rankings (each ranks 7-8 events)
		var alice = StudentBuilder.Default()
			.WithName("Alice", "A").WithGrade(9)
			.WithRanking(flight, 1).WithRanking(robotics, 2).WithRanking(biotech, 3)
			.WithRanking(speech, 4).WithRanking(webDesign, 5).WithRanking(coding, 6)
			.WithRanking(videoGame, 7)
			.Build();

		var bob = StudentBuilder.Default()
			.WithName("Bob", "B").WithGrade(10)
			.WithRanking(coding, 1).WithRanking(engineering, 2).WithRanking(robotics, 3)
			.WithRanking(speech, 4).WithRanking(biotech, 5).WithRanking(photo, 6)
			.WithRanking(videoGame, 7)
			.Build();

		var carol = StudentBuilder.Default()
			.WithName("Carol", "C").WithGrade(11)
			.WithRanking(photo, 1).WithRanking(webDesign, 2).WithRanking(engineering, 3)
			.WithRanking(speech, 4).WithRanking(biotech, 5).WithRanking(flight, 6)
			.WithRanking(coding, 7)
			.Build();

		var david = StudentBuilder.Default()
			.WithName("David", "D").WithGrade(9)
			.WithRanking(essays, 1).WithRanking(robotics, 2).WithRanking(videoGame, 3)
			.WithRanking(engineering, 4).WithRanking(speech, 5).WithRanking(coding, 6)
			.WithRanking(biotech, 7)
			.Build();

		var eve = StudentBuilder.Default()
			.WithName("Eve", "E").WithGrade(10)
			.WithRanking(flight, 1).WithRanking(webDesign, 2).WithRanking(engineering, 3)
			.WithRanking(robotics, 4).WithRanking(photo, 5).WithRanking(coding, 6)
			.WithRanking(speech, 7)
			.Build();

		var frank = StudentBuilder.Default()
			.WithName("Frank", "F").WithGrade(11)
			.WithRanking(coding, 1).WithRanking(biotech, 2).WithRanking(videoGame, 3)
			.WithRanking(speech, 4).WithRanking(webDesign, 5).WithRanking(flight, 6)
			.WithRanking(robotics, 7)
			.Build();

		var students = new[] { alice, bob, carol, david, eve, frank };

		// Use relaxed parameters for test
		var parameters = new AssignmentParameters(
			effortLowerBound: 4,
			effortUpperBound: 7,
			eventsLowerBound: 2,
			eventsUpperBound: 4,
			requireRegional: false,  // Relax for test simplicity
			requireOnSite: false     // Relax for test simplicity
		);

		var eventAssignment = new EventAssignment(events, students, parameters);
		var solution = await eventAssignment.Solve();

		// Verify solution
		Assert.That(solution.Teams, Is.Not.Null);
		Assert.That(solution.Status, Is.EqualTo("Optimal").Or.EqualTo("Feasible"),
			$"Solution should be Optimal or Feasible, but was {solution.Status}");

		// Print solution summary for verification
		Console.WriteLine($"Solution Status: {solution.Status}");
		Console.WriteLine($"Teams Created: {solution.Teams.Length}");
		Console.WriteLine($"Students Assigned: {solution.Teams.SelectMany(t => t.Students).Distinct().Count()}");

		// Verify each team has valid structure
		foreach (var team in solution.Teams)
		{
			Assert.That(team.Event, Is.Not.Null, $"Team should have an event");
			Assert.That(team.Students, Is.Not.Empty, $"Team for {team.Event.Name} should have students");
		}
	}

	[Test]
	public async Task SolutionTest_WithMinimalData()
	{
		// Test with minimal custom data to verify basic functionality
		var flight = EventDefinitionBuilder.Individual("Flight").Build();
		var coding = EventDefinitionBuilder.Individual("Coding").Build();
		var robotics = EventDefinitionBuilder.Team("Robotics", 2, 5).AsRegionalEvent().Build();
		var biotech = EventDefinitionBuilder.Team("Biotechnology", 2, 6).AsRegionalEvent().Build();

		var events = new[] { flight, coding, robotics, biotech };

		var alice = StudentBuilder.Default()
			.WithName("Alice", "A")
			.WithGrade(9)
			.WithRanking(flight, 1)
			.WithRanking(robotics, 2)
			.WithRanking(biotech, 3)
			.Build();

		var bob = StudentBuilder.Default()
			.WithName("Bob", "B")
			.WithGrade(10)
			.WithRanking(coding, 1)
			.WithRanking(robotics, 2)
			.WithRanking(biotech, 3)
			.Build();

		var carol = StudentBuilder.Default()
			.WithName("Carol", "C")
			.WithGrade(11)
			.WithRanking(flight, 2)
			.WithRanking(biotech, 1)
			.WithRanking(robotics, 3)
			.Build();

		var students = new[] { alice, bob, carol };

		// Run the event assignment algorithm with minimal data
		var parameters = new AssignmentParameters(
			effortLowerBound: 2,
			effortUpperBound: 4,
			eventsLowerBound: 2,
			eventsUpperBound: 3,
			requireRegional: false,
			requireOnSite: false
		);

		var eventAssignment = new EventAssignment(events, students, parameters);
		var solution = await eventAssignment.Solve();

		// Verify solution
		Assert.That(solution.Status, Is.EqualTo("Optimal").Or.EqualTo("Feasible"));
		Assert.That(solution.Teams, Is.Not.Empty, "Should create some teams");

		Console.WriteLine($"Minimal Test - Status: {solution.Status}");
		Console.WriteLine($"Teams: {solution.Teams.Length}");
	}
}