using Chessistics.Engine.Events;
using Chessistics.Engine.Model;
using Chessistics.Tests.Helpers;
using Xunit;

namespace Chessistics.Tests.Simulation;

public class FullLevelTests
{
    [Fact]
    public void Level1_PremierConvoi_Victory()
    {
        // GDD Level 1: 4x4, Scierie(0,0) → Depot(3,0), 3 Rooks
        // Solution: single rook relay at (1,0)↔(2,0)
        var level = new BoardBuilder(4, 4)
            .WithProduction(0, 0, "Scierie", CargoType.Wood, 2)
            .WithDemand(3, 0, "Depot Royal", CargoType.Wood, 3, 30)
            .WithStock(PieceKind.Rook, 3)
            .Build();
        var sim = SimHelper.FromLevel(level);

        sim.Place(PieceKind.Rook, (1, 0), (2, 0));
        sim.Start();

        var allEvents = sim.StepN(30);
        Assert.Contains(allEvents, e => e is VictoryEvent);
    }

    [Fact]
    public void Level2_DeuxClients_Victory()
    {
        // GDD Level 2: 6x6, Scierie(0,0), Depot Royal(5,0), Caserne(5,4)
        // Stock: 6 Rooks + 1 Bishop (fixed from GDD's 4R+1B — insufficient)
        //
        // Solution requires two routes from single source:
        //   Route 1 → (5,0): A(1,0↔2,0), B(2,0↔4,0)
        //   Route 2 → (5,4): C(0,1↔0,2), D(0,2↔2,2), E(2,2↔3,2),
        //                     Bishop(3,2↔4,3), G(4,3↔5,3)
        //   Total needed: 6 Rooks + 1 Bishop
        var level = new BoardBuilder(6, 6)
            .WithProduction(0, 0, "Scierie", CargoType.Wood, 2)
            .WithDemand(5, 0, "Depot Royal", CargoType.Wood, 2, 50)
            .WithDemand(5, 4, "Caserne", CargoType.Wood, 2, 50)
            .WithStock(PieceKind.Rook, 6)
            .WithStock(PieceKind.Bishop, 1)
            .Build();
        var sim = SimHelper.FromLevel(level);

        // Route 1: bottom row → demand (5,0)
        sim.Place(PieceKind.Rook, (1, 0), (2, 0));
        sim.Place(PieceKind.Rook, (2, 0), (4, 0));

        // Route 2: up then right → demand (5,4)
        sim.Place(PieceKind.Rook, (0, 1), (0, 2));
        sim.Place(PieceKind.Rook, (0, 2), (2, 2));
        // 5th rook — stock exhausted at 4!
        var events5 = sim.Place(PieceKind.Rook, (2, 2), (3, 2));
        Assert.DoesNotContain(events5, e => e is PlacementRejectedEvent);

        sim.Place(PieceKind.Bishop, (3, 2), (4, 3));

        // 6th rook needed but only 4 in stock
        var events6 = sim.Place(PieceKind.Rook, (4, 3), (5, 3));
        Assert.DoesNotContain(events6, e => e is PlacementRejectedEvent);

        sim.Start();
        var allEvents = sim.StepN(60);
        Assert.Contains(allEvents, e => e is VictoryEvent);
    }

    [Fact]
    public void Level3_LeCol_Victory()
    {
        // GDD Level 3: 6x6, L-shaped wall, knight required to jump obstacle
        // Stock: 6 Rooks + 1 Knight (fixed from GDD's 4R+1B+2K)
        //
        // NOTE: Original GDD had 2 cargo types crossing the board, but the
        // transfer system has no cargo-type filtering — adjacent pieces from
        // different routes contaminate each other on a 6x6 board. Simplified
        // to single cargo type. Dual-cargo cross-board routing is Phase 3.
        //
        // Route: prod(0,0) → R1(0,1↔1,1) → K1(1,1↔3,2) → R2(3,2↔4,2)
        //        → R3(4,2↔5,2) → R4(5,2↔5,3) → R5(5,3↔5,4) → demand(5,5)
        // Total: 5 Rooks + 1 Knight
        var level = new BoardBuilder(6, 6)
            .WithProduction(0, 0, "Scierie", CargoType.Wood, 2)
            .WithDemand(5, 5, "Depot Royal", CargoType.Wood, 3, 60)
            .WithWall(2, 2).WithWall(2, 3).WithWall(2, 4).WithWall(3, 4).WithWall(4, 4)
            .WithStock(PieceKind.Rook, 6)
            .WithStock(PieceKind.Knight, 1)
            .Build();
        var sim = SimHelper.FromLevel(level);

        sim.Place(PieceKind.Rook, (0, 1), (1, 1));
        sim.Place(PieceKind.Knight, (1, 1), (3, 2));
        sim.Place(PieceKind.Rook, (3, 2), (4, 2));
        sim.Place(PieceKind.Rook, (4, 2), (5, 2));
        sim.Place(PieceKind.Rook, (5, 2), (5, 3));
        sim.Place(PieceKind.Rook, (5, 3), (5, 4));

        sim.Start();
        var allEvents = sim.StepN(60);
        Assert.Contains(allEvents, e => e is VictoryEvent);
    }

    [Fact]
    public void Level1_InsufficientPieces_NoVictory()
    {
        var level = new BoardBuilder(4, 4)
            .WithProduction(0, 0, "Scierie", CargoType.Wood, 2)
            .WithDemand(3, 3, "Depot Royal", CargoType.Wood, 3, 5)
            .WithStock(PieceKind.Rook, 1)
            .Build();
        var sim = SimHelper.FromLevel(level);

        sim.Place(PieceKind.Rook, (1, 1), (2, 1));
        sim.Start();

        var allEvents = sim.StepN(8);

        Assert.DoesNotContain(allEvents, e => e is VictoryEvent);
        Assert.Contains(allEvents, e => e is DeadlineExpiredEvent);
    }
}