using System.IO;
using Chessistics.Engine.Loading;
using Chessistics.Engine.Model;
using Xunit;

namespace Chessistics.Tests.Loading;

public class Campaign01Tests
{
    private static CampaignDef LoadRealCampaign()
    {
        var repoRoot = Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..");
        var path = Path.GetFullPath(Path.Combine(repoRoot, "Data", "campaigns", "campaign_01.json"));
        return CampaignLoader.Load(File.ReadAllText(path));
    }

    [Fact]
    public void Campaign_HasExpectedStructure()
    {
        var c = LoadRealCampaign();
        Assert.Equal(9, c.Missions.Count);
        Assert.Equal(4, c.InitialWidth);
        Assert.Equal(4, c.InitialHeight);
    }

    [Fact]
    public void Mission8_AddsTwoTransformersAndExpandsTo12x10()
    {
        var c = LoadRealCampaign();
        var m8 = c.Missions[7];
        Assert.Equal("L'Expansion Finale", m8.Name);
        Assert.Equal(12, m8.TerrainPatch.NewWidth);
        Assert.Equal(10, m8.TerrainPatch.NewHeight);

        var transformers = m8.TerrainPatch.Cells.Where(p => p.Type == CellType.Transformer).ToList();
        Assert.Equal(2, transformers.Count);
        Assert.Contains(transformers, t => t.Transformer!.Name == "Forge Est");
        Assert.Contains(transformers, t => t.Transformer!.Name == "Armurerie Est");
    }

    [Fact]
    public void Mission9_CathedralDemandsAllThreeCargoTypes()
    {
        var c = LoadRealCampaign();
        var m9 = c.Missions[8];
        Assert.Equal("Le Couronnement", m9.Name);
        Assert.Equal(12, m9.TerrainPatch.NewWidth);
        Assert.Equal(12, m9.TerrainPatch.NewHeight);

        var demands = m9.TerrainPatch.Cells.Where(p => p.Type == CellType.Demand).ToList();
        Assert.Equal(3, demands.Count);
        var types = demands.Select(d => d.Demand!.Cargo).ToHashSet();
        Assert.Contains(CargoType.Tools, types);
        Assert.Contains(CargoType.Arms, types);
        Assert.Contains(CargoType.Gold, types);
    }

    [Fact]
    public void Mission7_RenamedToComptoir()
    {
        var c = LoadRealCampaign();
        var m7 = c.Missions[6];
        Assert.Equal("Le Comptoir", m7.Name);
    }

    [Fact]
    public void AllTerrainPatchesAreNonRegressive()
    {
        // Subsequent missions must only grow the board, never shrink it.
        var c = LoadRealCampaign();
        int w = c.InitialWidth, h = c.InitialHeight;
        for (int i = 0; i < c.Missions.Count; i++)
        {
            var tp = c.Missions[i].TerrainPatch;
            Assert.True(tp.NewWidth >= w, $"Mission {i}: width shrunk from {w} to {tp.NewWidth}");
            Assert.True(tp.NewHeight >= h, $"Mission {i}: height shrunk from {h} to {tp.NewHeight}");
            w = tp.NewWidth;
            h = tp.NewHeight;
        }
    }
}