using NUnit.Framework;
using UnityEngine;
using YachtDice.Inventory;
using YachtDice.Modifiers;

namespace YachtDice.Tests
{

public sealed class InventoryModelTests
{
    private InventoryModel inventory;

    [SetUp]
    public void SetUp()
    {
        inventory = new InventoryModel(3);
    }

    private ModifierData CreateTestData(string id = "test",
        ModifierDurability durability = ModifierDurability.Permanent, int maxUses = 0)
    {
        return ModifierData.CreateForTest(id, ModifierScope.SelectedCategory,
            ModifierEffectType.AddFlatToFinalScore, 10f,
            durability: durability, maxUses: maxUses);
    }

    [Test]
    public void AddModifier_IncreasesCount()
    {
        inventory.AddModifier(CreateTestData());

        Assert.AreEqual(1, inventory.OwnedModifiers.Count);
    }

    [Test]
    public void TryActivate_SucceedsWithinSlotLimit()
    {
        inventory.AddModifier(CreateTestData("a"));
        var mod = inventory.OwnedModifiers[0];

        bool result = inventory.TryActivate(mod);

        Assert.IsTrue(result);
        Assert.IsTrue(mod.IsActive);
        Assert.AreEqual(1, inventory.ActiveCount);
    }

    [Test]
    public void TryActivate_FailsWhenSlotsFull()
    {
        for (int i = 0; i < 3; i++)
        {
            inventory.AddModifier(CreateTestData($"m{i}"));
            inventory.TryActivate(inventory.OwnedModifiers[i]);
        }

        inventory.AddModifier(CreateTestData("extra"));
        var extra = inventory.OwnedModifiers[3];
        bool result = inventory.TryActivate(extra);

        Assert.IsFalse(result);
        Assert.IsFalse(extra.IsActive);
        Assert.AreEqual(3, inventory.ActiveCount);
    }

    [Test]
    public void Deactivate_FreesSlot()
    {
        inventory.AddModifier(CreateTestData());
        var mod = inventory.OwnedModifiers[0];
        inventory.TryActivate(mod);

        inventory.Deactivate(mod);

        Assert.IsFalse(mod.IsActive);
        Assert.AreEqual(0, inventory.ActiveCount);
    }

    [Test]
    public void RemoveModifier_DeactivatesAndRemoves()
    {
        inventory.AddModifier(CreateTestData());
        var mod = inventory.OwnedModifiers[0];
        inventory.TryActivate(mod);

        inventory.RemoveModifier(mod);

        Assert.AreEqual(0, inventory.OwnedModifiers.Count);
        Assert.AreEqual(0, inventory.ActiveCount);
    }

    [Test]
    public void ConsumeUseOnActive_DecrementsUses()
    {
        inventory.AddModifier(CreateTestData("ltd", ModifierDurability.LimitedUses, 3));
        var mod = inventory.OwnedModifiers[0];
        inventory.TryActivate(mod);

        inventory.ConsumeUseOnActive();

        Assert.AreEqual(2, mod.RemainingUses);
    }

    [Test]
    public void ConsumeUseOnActive_RemovesExpired()
    {
        inventory.AddModifier(CreateTestData("ltd", ModifierDurability.LimitedUses, 1));
        var mod = inventory.OwnedModifiers[0];
        inventory.TryActivate(mod);

        inventory.ConsumeUseOnActive();

        Assert.AreEqual(0, inventory.OwnedModifiers.Count);
    }

    [Test]
    public void ConsumeUseOnActive_IgnoresPermanent()
    {
        inventory.AddModifier(CreateTestData("perm", ModifierDurability.Permanent));
        var mod = inventory.OwnedModifiers[0];
        inventory.TryActivate(mod);

        inventory.ConsumeUseOnActive();

        Assert.AreEqual(1, inventory.OwnedModifiers.Count);
        Assert.IsTrue(mod.IsActive);
    }

    [Test]
    public void GetActiveModifierData_ReturnsOnlyActive()
    {
        inventory.AddModifier(CreateTestData("a"));
        inventory.AddModifier(CreateTestData("b"));
        inventory.TryActivate(inventory.OwnedModifiers[0]);

        var active = inventory.GetActiveModifierData();

        Assert.AreEqual(1, active.Count);
    }

    [Test]
    public void SetMaxActiveSlots_AllowsExpansion()
    {
        inventory.SetMaxActiveSlots(10);

        Assert.AreEqual(10, inventory.MaxActiveSlots);
    }

    [Test]
    public void OnActiveModifiersChanged_FiredOnActivate()
    {
        bool fired = false;
        inventory.OnActiveModifiersChanged += _ => fired = true;
        inventory.AddModifier(CreateTestData());

        inventory.TryActivate(inventory.OwnedModifiers[0]);

        Assert.IsTrue(fired);
    }
}
}