using Chessistics.Engine.Loading;
using Chessistics.Engine.Model;
using System.Text.Json;
using Xunit;

namespace Chessistics.Tests.Loading;

public class LevelLoaderTests
{
    private const string ValidJson = """
    {
      "id": 1,
      "name": "Premier Convoi",
      "description": "Acheminez du bois de la scierie au depot.",
      "width": 4,
      "height": 4,
      "productions": [
        { "col": 0, "row": 0, "name": "Scierie", "cargo": "wood", "interval": 2 }
      ],
      "demands": [
        { "col": 3, "row": 0, "name": "Depot Royal", "cargo": "wood", "amount": 3, "deadline": 30 }
      ],
      "walls": [],
      "stock": [
        { "kind": "rook", "count": 3 }
      ]
    }
    """;

    [Fact]
    public void LoadsValidJson()
    {
        var level = LevelLoader.Load(ValidJson);

        Assert.Equal(1, level.Id);
        Assert.Equal("Premier Convoi", level.Name);
        Assert.Equal(4, level.Width);
        Assert.Equal(4, level.Height);

        Assert.Single(level.Productions);
        var prod = level.Productions[0];
        Assert.Equal(new Coords(0, 0), prod.Position);
        Assert.Equal("Scierie", prod.Name);
        Assert.Equal(CargoType.Wood, prod.Cargo);
        Assert.Single(level.Demands);
        var demand = level.Demands[0];
        Assert.Equal(new Coords(3, 0), demand.Position);
        Assert.Equal("Depot Royal", demand.Name);
        Assert.Equal(CargoType.Wood, demand.Cargo);
        Assert.Equal(3, demand.Amount);
        Assert.Equal(30, demand.Deadline);

        Assert.Empty(level.Walls);

        Assert.Single(level.Stock);
        Assert.Equal(PieceKind.Rook, level.Stock[0].Kind);
        Assert.Equal(3, level.Stock[0].Count);
    }

    [Fact]
    public void InvalidJson_Throws()
    {
        Assert.Throws<JsonException>(() => LevelLoader.Load("not json at all"));
    }

    [Fact]
    public void MissingName_Throws()
    {
        var json = """
        {
          "id": 1, "name": "", "width": 4, "height": 4,
          "productions": [{ "col": 0, "row": 0, "name": "S", "cargo": "wood", "interval": 2 }],
          "demands": [{ "col": 3, "row": 0, "name": "D", "cargo": "wood", "amount": 1, "deadline": 10 }],
          "stock": [{ "kind": "rook", "count": 1 }]
        }
        """;
        Assert.Throws<JsonException>(() => LevelLoader.Load(json));
    }

    [Fact]
    public void MissingStock_Throws()
    {
        var json = """
        {
          "id": 1, "name": "Test", "width": 4, "height": 4,
          "productions": [{ "col": 0, "row": 0, "name": "S", "cargo": "wood", "interval": 2 }],
          "demands": [{ "col": 3, "row": 0, "name": "D", "cargo": "wood", "amount": 1, "deadline": 10 }],
          "stock": []
        }
        """;
        Assert.Throws<JsonException>(() => LevelLoader.Load(json));
    }

    [Fact]
    public void LoadsLevelWithWalls()
    {
        var json = """
        {
          "id": 3, "name": "Le Col", "width": 6, "height": 6,
          "productions": [{ "col": 0, "row": 0, "name": "Scierie", "cargo": "wood", "interval": 2 }],
          "demands": [{ "col": 5, "row": 5, "name": "Depot", "cargo": "wood", "amount": 2, "deadline": 40 }],
          "walls": [{ "col": 2, "row": 2 }, { "col": 2, "row": 3 }],
          "stock": [{ "kind": "rook", "count": 4 }, { "kind": "knight", "count": 2 }]
        }
        """;
        var level = LevelLoader.Load(json);

        Assert.Equal(2, level.Walls.Count);
        Assert.Contains(new Coords(2, 2), level.Walls);
        Assert.Contains(new Coords(2, 3), level.Walls);
        Assert.Equal(2, level.Stock.Count);
    }
}