using System.Collections;
using System.Reflection;
using BumpCombat.Constants;
using BumpCombat.Defense.Comparison;
using BumpCombat.Enemies;
using NUnit.Framework;
using UnityEditor;
using UnityEngine;
using UnityEngine.TestTools;
using Object = UnityEngine.Object;

namespace BumpCombat.Tests
{
    public sealed class Defense25DSkeletonCombatPlayModeTests
    {
        private Defense25DComparison world;
        private Defense25DComparisonSettings settings;
        private AnimationClip attackClip;
        private float previousTimeScale;

        [UnitySetUp]
        public IEnumerator SetUp()
        {
            previousTimeScale = Time.timeScale;
            Time.timeScale = 1f;
            settings = Object.Instantiate(AssetDatabase.LoadAssetAtPath<Defense25DComparisonSettings>(
                "Assets/_Project/Constants/Defense25DComparison/ComparisonSettings.asset"));
            Assert.That(settings, Is.Not.Null);
            world = new GameObject("Skeleton combat under test").AddComponent<Defense25DComparison>();
            world.Initialize(settings);
            world.AutoSpawn = false;
            world.ReadInput = false;
            world.SetPaused(false);
            Time.timeScale = 0f;
            yield return null;
        }

        [UnityTearDown]
        public IEnumerator TearDown()
        {
            if (world != null) Object.Destroy(world.gameObject);
            if (settings != null) Object.Destroy(settings);
            Time.timeScale = previousTimeScale;
            yield return null;
        }

        [UnityTest]
        public IEnumerator SkeletonSlashDamagesOnceWhenItsAuthoredActiveWindowBegins()
        {
            EnemyDefinition skeleton = AssetDatabase.LoadAssetAtPath<EnemyDefinition>(
                "Assets/_Project/Constants/Enemies/Skeleton.asset");
            attackClip = AssetDatabase.LoadAssetAtPath<AnimationClip>(
                "Assets/_Project/Art/Characters/Skeleton/Animations/Skeleton_Attack.anim");
            Assert.That(skeleton, Is.Not.Null);
            Assert.That(attackClip, Is.Not.Null);
            Defense25DEnemy enemy = world.Enemies[0];
            Assert.That(world.IsRunning, Is.True);
            enemy.Spawn(Vector2.zero);
            enemy.ConfigureSkeletonCombat(skeleton, 1.25f, attackClip);
            Assert.That(world.Settings.EnemyRadius, Is.EqualTo(.275f).Within(.0001f));
            Assert.That(world.Settings.EnemyColliderOffset, Is.EqualTo(new Vector2(0f, -.35f)));
            world.Player.ResetAt(new Vector2(.5f, 0f));
            Physics.SyncTransforms();

            SetGameTime(0f);
            Assert.That(enemy.StepSkeletonCombat(Time.fixedDeltaTime), Is.True);
            Assert.That(world.IsRunning, Is.True);
            Assert.That(enemy.IsAttacking, Is.True);
            SetGameTime(.699f);
            enemy.StepSkeletonCombat(Time.fixedDeltaTime);
            Assert.That(world.Player.DamageEvents, Is.Zero,
                "The warning phase must not deal damage.");

            SetGameTime(.7f);
            enemy.StepSkeletonCombat(Time.fixedDeltaTime);
            Assert.That(world.Player.DamageEvents, Is.EqualTo(1));
            Assert.That(world.Player.CurrentHealth, Is.EqualTo(world.Player.MaxHealth - 12f).Within(.001f));

            SetGameTime(.72f);
            enemy.StepSkeletonCombat(Time.fixedDeltaTime);
            Assert.That(world.Player.DamageEvents, Is.EqualTo(1),
                "A successful slash is latched for the rest of its active window.");
            yield return null;
        }

        private void SetGameTime(float value)
        {
            typeof(Defense25DComparison).GetProperty(nameof(Defense25DComparison.GameTime))
                .GetSetMethod(true).Invoke(world, new object[] { value });
        }
    }
}