using Vanguard.Rules.Cards;
using Vanguard.Rules.Decks;
using Xunit;

namespace Vanguard.Rules.Tests;

public class DeckValidatorTests
{
    private readonly CardCatalog _catalog = TestCatalog.Instance;

    [Fact]
    public void Legal_Deck_Has_No_Violations()
    {
        var deck = BuildLegalDeck();

        Assert.Empty(DeckValidator.Validate(_catalog, deck));
    }

    [Fact]
    public void Deck_Must_Have_Fifty_Cards()
    {
        var deck = BuildLegalDeck();
        deck.RemoveAt(0);

        var violations = DeckValidator.Validate(_catalog, deck);

        Assert.Contains(violations, v => v.Code == "deck.size");
    }

    [Fact]
    public void Copy_Limit_Counts_By_Name_Across_Printings()
    {
        var deck = DeckWith(("BT01/002EN", 4), ("TD01/005EN", 4));

        var violations = DeckValidator.Validate(_catalog, deck);

        var copies = Assert.Single(violations, v => v.Code == "deck.copies");
        Assert.Contains("Blaster Blade", copies.Message);
    }

    [Fact]
    public void Copy_Limit_Counts_Parallel_Art_As_Same_Card()
    {
        var deck = DeckWith(("BT01/002EN", 4), ("BT01/S02EN", 4));

        var violations = DeckValidator.Validate(_catalog, deck);

        Assert.Contains(violations, v => v.Code == "deck.copies");
    }

    [Fact]
    public void Sentinel_Limit_Is_Four()
    {
        var deck = DeckWith(("BT01/011EN", 4), ("BT01/015EN", 1));

        var violations = DeckValidator.Validate(_catalog, deck);

        Assert.Contains(violations, v => v.Code == "deck.sentinel");
    }

    [Fact]
    public void Heal_Limit_Is_Four()
    {
        var deck = DeckWith(("BT01/047EN", 4), ("BT01/053EN", 1));

        var violations = DeckValidator.Validate(_catalog, deck);

        Assert.Contains(violations, v => v.Code == "deck.heal");
    }

    [Fact]
    public void Unknown_Printing_Is_Reported()
    {
        var deck = BuildLegalDeck();
        deck[0] = "BT99/999EN";

        var violations = DeckValidator.Validate(_catalog, deck);

        Assert.Contains(violations, v => v.Code == "deck.unknown-printing");
    }

    private List<string> BuildLegalDeck() => DeckWith();

    /// <summary>
    /// Собирает колоду на 50 карт: сначала заданные принты, затем по 4 копии
    /// каждого имени, кроме Sentinel и Heal (чтобы не упираться в их лимиты).
    /// </summary>
    private List<string> DeckWith(params (string PrintingId, int Count)[] seed)
    {
        var deck = new List<string>();
        var usedNames = new HashSet<string>(StringComparer.Ordinal);

        foreach (var (printingId, count) in seed)
        {
            deck.AddRange(Enumerable.Repeat(printingId, count));
            usedNames.Add(_catalog.Printing(printingId).NameId);
        }

        foreach (var group in _catalog.Printings
                     .Where(p => !p.IsParallel)
                     .GroupBy(p => p.NameId)
                     .OrderBy(g => g.Key, StringComparer.Ordinal))
        {
            if (deck.Count >= DeckValidator.RequiredSize)
                break;

            if (usedNames.Contains(group.Key))
                continue;

            var card = _catalog.Card(group.Key);
            if (card.IsSentinel || card.Trigger == TriggerType.Heal)
                continue;

            var printingId = group.First().PrintingId;
            usedNames.Add(group.Key);

            for (var i = 0; i < DeckValidator.MaxCopiesPerName && deck.Count < DeckValidator.RequiredSize; i++)
                deck.Add(printingId);
        }

        return deck;
    }
}