using Moq;
using SportsDivision.Application.Services;
using SportsDivision.Domain.Entities;
using SportsDivision.Domain.Enums;
using SportsDivision.Domain.Interfaces;

namespace SportsDivision.Application.Tests;

public class ScoringPlacementTests
{
    private readonly Mock<IUnitOfWork> _mockUow;
    private readonly ScoringService _service;

    public ScoringPlacementTests()
    {
        _mockUow = new Mock<IUnitOfWork>();
        _service = new ScoringService(_mockUow.Object, null!);
    }

    private void Setup(EventCategory category, List<Score> scores)
    {
        _mockUow.Setup(u => u.TournamentEventLevels.GetWithRegistrationsAsync(It.IsAny<int>()))
            .ReturnsAsync(new TournamentEventLevel
            {
                TournamentEventLevelId = 1,
                Event = new Event { Category = category }
            });
        _mockUow.Setup(u => u.Scores.GetByTournamentEventLevelAsync(It.IsAny<int>()))
            .ReturnsAsync(scores);
        _mockUow.Setup(u => u.PlacementPointConfigs.GetAllAsync())
            .ReturnsAsync(new List<PlacementPointConfig>
            {
                new() { Placement = 1, Points = 10 },
                new() { Placement = 2, Points = 8 },
                new() { Placement = 3, Points = 6 },
                new() { Placement = 4, Points = 5 },
            });
        _mockUow.Setup(u => u.SaveChangesAsync()).ReturnsAsync(1);
    }

    private static Score MakeScore(int regId, decimal performance) =>
        new() { EventRegistrationId = regId, RawPerformance = performance };

    [Fact]
    public async Task CalculatePlacements_FieldEvent_RanksByPerformanceDescending()
    {
        // Points-based ranking used to assign arbitrary places when no scoring
        // constant existed (all CalculatedPoints = 0); ranking is now on the mark.
        var s1 = MakeScore(1, 10.00m);
        var s2 = MakeScore(2, 12.50m);
        var s3 = MakeScore(3, 11.00m);
        Setup(EventCategory.Field, new List<Score> { s1, s2, s3 });

        await _service.CalculatePlacementsAsync(1);

        Assert.Equal(1, s2.Placement);
        Assert.Equal(2, s3.Placement);
        Assert.Equal(3, s1.Placement);
        Assert.Equal(10, s2.PlacementPoints);
    }

    [Fact]
    public async Task CalculatePlacements_TrackEvent_RanksAscending()
    {
        var s1 = MakeScore(1, 11.20m);
        var s2 = MakeScore(2, 10.90m);
        Setup(EventCategory.Track, new List<Score> { s1, s2 });

        await _service.CalculatePlacementsAsync(1);

        Assert.Equal(1, s2.Placement);
        Assert.Equal(2, s1.Placement);
    }

    [Fact]
    public async Task CalculatePlacements_Ties_SharePlaceAndSplitPooledPoints()
    {
        // Two identical throws share 1st (competition ranking 1, 1, 3) and split
        // the pooled points for places 1 and 2: (10 + 8) / 2 = 9.
        var s1 = MakeScore(1, 12.50m);
        var s2 = MakeScore(2, 12.50m);
        var s3 = MakeScore(3, 11.00m);
        Setup(EventCategory.Field, new List<Score> { s1, s2, s3 });

        await _service.CalculatePlacementsAsync(1);

        Assert.Equal(1, s1.Placement);
        Assert.Equal(1, s2.Placement);
        Assert.Equal(9, s1.PlacementPoints);
        Assert.Equal(9, s2.PlacementPoints);
        Assert.Equal(3, s3.Placement);
        Assert.Equal(6, s3.PlacementPoints);
    }

    [Fact]
    public async Task CalculatePlacements_ZeroMark_GetsNoPlacementAndOldPlacementCleared()
    {
        var foul = MakeScore(1, 0m);
        foul.Placement = 1;          // stale from an earlier calculation
        foul.PlacementPoints = 10;
        var valid = MakeScore(2, 9.50m);
        Setup(EventCategory.Field, new List<Score> { foul, valid });

        await _service.CalculatePlacementsAsync(1);

        Assert.Null(foul.Placement);
        Assert.Equal(0, foul.PlacementPoints);
        Assert.Equal(1, valid.Placement);
    }
}

public class HeatAdvancementResetTests
{
    [Fact]
    public async Task CalculateAdvancement_ClearsStaleFlagsBeforeRecalculating()
    {
        // An athlete who advanced in a previous calculation but no longer qualifies
        // after a time correction must lose the flag on recalculation.
        var stale = new HeatLane { HeatLaneId = 1, Time = 12.5m, IsAdvanced = true, AdvanceReason = AdvanceReason.TopN };
        var faster = new HeatLane { HeatLaneId = 2, Time = 11.0m };
        var round = new Round
        {
            RoundId = 1,
            AdvanceTopN = 1,
            AdvanceFastestLosers = 0,
            Heats = new List<Heat>
            {
                new() { HeatId = 1, HeatLanes = new List<HeatLane> { stale, faster } }
            }
        };

        var mockUow = new Mock<IUnitOfWork>();
        mockUow.Setup(u => u.Rounds.GetWithHeatsAsync(1)).ReturnsAsync(round);
        mockUow.Setup(u => u.HeatLanes.Update(It.IsAny<HeatLane>()));
        mockUow.Setup(u => u.SaveChangesAsync()).ReturnsAsync(1);
        var service = new HeatManagementService(mockUow.Object, null!);

        await service.CalculateAdvancementAsync(1);

        Assert.False(stale.IsAdvanced);
        Assert.Null(stale.AdvanceReason);
        Assert.True(faster.IsAdvanced);
        Assert.Equal(AdvanceReason.TopN, faster.AdvanceReason);
    }
}