using AcDream.Core.Spells;
using Xunit;

namespace AcDream.Core.Tests.Spells;

public sealed class SpellbookTests
{
    [Fact]
    public void OnSpellLearned_FiresEvent_Idempotent()
    {
        var book = new Spellbook();
        int events = 0;
        book.SpellLearned += _ => events++;

        book.OnSpellLearned(0x3E1);   // Flame Bolt I
        book.OnSpellLearned(0x3E1);   // duplicate — no event

        Assert.Equal(1, events);
        Assert.Equal(1, book.LearnedCount);
        Assert.True(book.Knows(0x3E1));
    }

    [Fact]
    public void OnSpellForgotten_FiresEvent()
    {
        var book = new Spellbook();
        book.OnSpellLearned(0x3E1);

        uint seen = 0;
        book.SpellForgotten += id => seen = id;

        book.OnSpellForgotten(0x3E1);
        Assert.Equal(0x3E1u, seen);
        Assert.False(book.Knows(0x3E1));
    }

    [Fact]
    public void OnEnchantmentAdded_FiresEvent_StoresByLayer()
    {
        var book = new Spellbook();
        ActiveEnchantmentRecord added = default;
        book.EnchantmentAdded += r => added = r;

        book.OnEnchantmentAdded(spellId: 42, layerId: 7, duration: 300f, casterGuid: 0xBEEF);

        Assert.Equal(42u, added.SpellId);
        Assert.Equal(7u, added.LayerId);
        Assert.Equal(300f, added.Duration, 4);
        Assert.Equal(1, book.ActiveCount);
    }

    [Fact]
    public void OnEnchantmentAdded_SameLayer_Replaces()
    {
        var book = new Spellbook();
        book.OnEnchantmentAdded(42, 7, 300f, 0);
        book.OnEnchantmentAdded(42, 7, 600f, 0);   // refresh

        Assert.Equal(1, book.ActiveCount);
        foreach (var e in book.ActiveEnchantments)
            Assert.Equal(600f, e.Duration, 4);
    }

    [Fact]
    public void OnEnchantmentRemoved_FiresEvent()
    {
        var book = new Spellbook();
        book.OnEnchantmentAdded(42, 7, 300f, 0);

        uint removedSpell = 0;
        book.EnchantmentRemoved += r => removedSpell = r.SpellId;

        book.OnEnchantmentRemoved(7, 42);
        Assert.Equal(42u, removedSpell);
        Assert.Equal(0, book.ActiveCount);
    }

    [Fact]
    public void OnPurgeAll_RemovesAllEnchantments_FiresPerRecord()
    {
        var book = new Spellbook();
        book.OnEnchantmentAdded(1, 1, 100f, 0);
        book.OnEnchantmentAdded(2, 2, 100f, 0);
        book.OnEnchantmentAdded(3, 3, 100f, 0);

        int removals = 0;
        book.EnchantmentRemoved += _ => removals++;

        book.OnPurgeAll();
        Assert.Equal(3, removals);
        Assert.Equal(0, book.ActiveCount);
    }
}