using System;
using System.Collections;
using System.Collections.Generic;
using NUnit.Framework;
using UnityEngine;
using UnityEngine.TestTools;

namespace NEG.Utils.Achievments.Tests
{
    using AchievmentTypes;
    using static Internal.Extensions;

    public class ConfigTests
    {
        public const string AchievmentsLabel = "TestAchievments";

        public const string AchievmentIdToggle = "TOGGLE";
        public const string AchievmentIdInt = "INT";
        public const string AchievmentIdFloat = "FLOAT";
        public const string AchievmentIdInvalid = "huptyrz";
        public const int RandomProgress = 15;
        public const int ProgressChangeDelta = 15;
        public const int CompletedProgress = 100;
        public const int OvershootProgress = 150;

        #region Id And Types
        [Test]
        public void AchivmentInvalidId()
        {
            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel).Build();

            TestInvalidId(AchievmentIdInvalid, (id) => manager.GetAchievmentForId(id), "Get");
        }

        [Test]
        public void AchivmentInvalidType()
        {
            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel).Build();

            manager.TestInvalidType<IntAchievmentData, ToggleAchievmentData>(AchievmentIdToggle, "Toggle");
            manager.TestInvalidType<FloatAchievmentData, IntAchievmentData>(AchievmentIdInt, "Int");
            manager.TestInvalidType<ToggleAchievmentData, FloatAchievmentData>(AchievmentIdFloat, "Float");
        }

        [Test]
        public void AchivmentCorrectIdAndType()
        {
            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel).Build();
            
            manager.TestValidIdAndType<ToggleAchievmentData>(AchievmentIdToggle, "Toggle");
            manager.TestValidIdAndType<IntAchievmentData>(AchievmentIdInt, "Int");
            manager.TestValidIdAndType<FloatAchievmentData>(AchievmentIdFloat, "Float");
        }
        #endregion

        #region Toggle
        [Test]
        public void AchivmentToggleSet()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            manager.SetToggleAchivment(AchievmentIdToggle);
            callbackTester.TestCompleted<ToggleAchievmentData>(AchievmentIdToggle);
            callbackTester.Reset();
            
            manager.SetToggleAchivment(AchievmentIdToggle);
            callbackTester.TestNoChanges();
        }

        #endregion

        #region Int
        [Test]
        public void AchivmentIntSetLess()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            //Set progress to some value progress
            manager.SetIntProgress(AchievmentIdInt, RandomProgress);
            var data = callbackTester.GetChanged<IntAchievmentData>();

            Assert.AreEqual(RandomProgress, data.CurrentProgress);
            Assert.IsFalse(data.IsCompleted);
            callbackTester.Reset();
        }

        [Test]
        public void AchivmentIntSetEqual()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            //Set progress to some value equal to required value
            manager.SetIntProgress(AchievmentIdInt, CompletedProgress);
            var data = callbackTester.GetChanged<IntAchievmentData>();
            Assert.AreEqual(CompletedProgress, data.CurrentProgress);
            callbackTester.TestCompleted<IntAchievmentData>(AchievmentIdInt);
            callbackTester.Reset();

            //Do that again, this time nothing sould change
            manager.SetIntProgress(AchievmentIdInt, CompletedProgress);
            callbackTester.TestNoChanges();
            callbackTester.Reset();

        }

        [Test]
        public void AchivmentIntSetGreater()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            //Set progress to some value greater than required
            manager.SetIntProgress(AchievmentIdInt, OvershootProgress);
            var data = callbackTester.GetChanged<IntAchievmentData>();
            //Testing against completed progress, should be clamped down
            Assert.AreEqual(CompletedProgress, data.CurrentProgress);
            callbackTester.TestCompleted<IntAchievmentData>(AchievmentIdInt);
            callbackTester.Reset();

            //Do that again, this time nothing sould change
            manager.SetIntProgress(AchievmentIdInt, OvershootProgress);
            callbackTester.TestNoChanges();
            callbackTester.Reset();
        }

        [Test]
        public void AchivmentIntChangeCompletion()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();
            
            //Add progresss one interval below completion
            for (int i = 0; i < CompletedProgress / ProgressChangeDelta; i++)
            {
                manager.ChangeIntProgress(AchievmentIdInt, ProgressChangeDelta);
                callbackTester.TestNotCompleted();
                var changed = callbackTester.GetChanged<IntAchievmentData>();

                Assert.AreEqual((i + 1) * ProgressChangeDelta, changed.CurrentProgress);
                callbackTester.Reset();
            }

            //Add progress one more time, should now be completed
            manager.ChangeIntProgress(AchievmentIdInt, ProgressChangeDelta);
            var changed1 = callbackTester.GetChanged<IntAchievmentData>();
            Assert.AreEqual(CompletedProgress, changed1.CurrentProgress);
            callbackTester.TestCompleted<IntAchievmentData>(AchievmentIdInt);
            callbackTester.Reset();

            //Do that again, this time nothing should change
            manager.ChangeIntProgress(AchievmentIdInt, ProgressChangeDelta);
            callbackTester.TestNoChanges();
            callbackTester.Reset();

            //Do that again, but down this time also nothing should change
            manager.ChangeIntProgress(AchievmentIdInt, -ProgressChangeDelta);
            callbackTester.TestNoChanges();
            callbackTester.Reset();
        }
        #endregion

        #region Float
        [Test]
        public void AchivmentFloatSetLess()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            //Set progress to some value progress
            manager.SetFloatProgress(AchievmentIdFloat, RandomProgress);
            var data = callbackTester.GetChanged<FloatAchievmentData>();

            Assert.AreEqual((float)RandomProgress, data.CurrentProgress);
            Assert.IsFalse(data.IsCompleted);
            callbackTester.Reset();
        }

        [Test]
        public void AchivmentFloatSetEqual()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            //Set progress to some value equal to required value
            manager.SetFloatProgress(AchievmentIdFloat, CompletedProgress);
            var data = callbackTester.GetChanged<FloatAchievmentData>();
            Assert.AreEqual((float)CompletedProgress, data.CurrentProgress);
            callbackTester.TestCompleted<FloatAchievmentData>(AchievmentIdFloat);
            callbackTester.Reset();

            //Do that again, this time nothing sould change
            manager.SetFloatProgress(AchievmentIdFloat, CompletedProgress);
            callbackTester.TestNoChanges();
            callbackTester.Reset();

        }

        [Test]
        public void AchivmentFloatSetGreater()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            //Set progress to some value greater than required
            manager.SetFloatProgress(AchievmentIdFloat, OvershootProgress);
            var data = callbackTester.GetChanged<FloatAchievmentData>();
            //Testing against completed progress, should be clamped down
            Assert.AreEqual((float)CompletedProgress, data.CurrentProgress);
            callbackTester.TestCompleted<FloatAchievmentData>(AchievmentIdFloat);
            callbackTester.Reset();

            //Do that again, this time nothing sould change
            manager.SetFloatProgress(AchievmentIdFloat, OvershootProgress);
            callbackTester.TestNoChanges();
            callbackTester.Reset();
        }

        [Test]
        public void AchivmentFloatChangeCompletion()
        {
            var callbackTester = new TestCallbackRereiver();

            AchievmentManager manager = AchievmentManager.Builder.FromLabeledConfig(AchievmentsLabel)
                .WithCallbackReciever(callbackTester)
                .Build();

            //Add progresss one interval below completion
            for (int i = 0; i < CompletedProgress / ProgressChangeDelta; i++)
            {
                manager.ChangeFloatProgress(AchievmentIdFloat, ProgressChangeDelta);
                callbackTester.TestNotCompleted();
                var changed = callbackTester.GetChanged<FloatAchievmentData>();

                Assert.AreEqual((i + 1) * ProgressChangeDelta, changed.CurrentProgress, 0.0f);
                callbackTester.Reset();
            }

            //Add progress one more time, should now be completed
            manager.ChangeFloatProgress(AchievmentIdFloat, ProgressChangeDelta);
            var changed1 = callbackTester.GetChanged<FloatAchievmentData>();
            Assert.AreEqual((float)CompletedProgress, changed1.CurrentProgress);
            callbackTester.TestCompleted<FloatAchievmentData>(AchievmentIdFloat);
            callbackTester.Reset();

            //Do that again, this time nothing should change
            manager.ChangeFloatProgress(AchievmentIdFloat, ProgressChangeDelta);
            callbackTester.TestNoChanges();
            callbackTester.Reset();

            //Do that again, but down this time also nothing should change
            manager.ChangeFloatProgress(AchievmentIdFloat, -ProgressChangeDelta);
            callbackTester.TestNoChanges();
            callbackTester.Reset();
        }
        #endregion

        private class TestCallbackRereiver : IAchievmentCallbackReciever
        {
            public AchievmentData LastDataUpdated { get; private set; } = null;
            public Type LastTypeSet { get; private set; } = null;
            public string LastIdSet { get; private set; } = null;
            
            public void Reset()
            {
                LastDataUpdated = null;
                LastTypeSet = null;
                LastIdSet = null;
            }

            public T GetChanged<T>() where T : AchievmentData
            {
                Assert.IsInstanceOf(typeof(T), LastDataUpdated);

                return (T)LastDataUpdated;
            }

            public void TestNoChanges()
            {
                Assert.IsNull(LastDataUpdated);
                Assert.IsNull(LastTypeSet);
                Assert.IsNull(LastIdSet);
            }

            public void TestNotCompleted()
            {
                //No need to also check LastTypeSet, they are both set or bot null
                Assert.IsNull(LastIdSet);
            }

            public void TestCompleted<Type>(string id)
            {
                Assert.AreEqual(typeof(Type), LastTypeSet);
                Assert.AreEqual(id, LastIdSet);
                //Shold not be null: if we axpect achievment to be completed it must have also been updated
                Assert.IsTrue(LastDataUpdated.IsCompleted);
            }

            public void AchievmentCompleted(AchievmentData achievment)
            {
                LastTypeSet = achievment.GetType();
                LastIdSet = achievment.Achievment.Id;
            }

            public void AchievmentStateChanged(AchievmentData achievment)
            {
                LastDataUpdated = achievment;
            }
        }
    }

    namespace Internal
    {
        public static class Extensions 
        { 
            public static void TestValidIdAndType<Type>(this AchievmentManager manager, string id, string testName) where Type : AchievmentData
            {
                TestValidIdAndType(id, (id) => manager.GetAchievmentForId<Type>(id), testName);
            }

            public static void TestValidIdAndType(string id, Action<string> manipulation, string testName)
            {
                Assert.DoesNotThrow(() => manipulation(id), $"{testName}: Invalid type or id");
            }

            public static void TestInvalidId(this AchievmentManager manager, string id, string testName)
            {
                TestInvalidId(id, (id) => manager.GetAchievmentForId(id), testName);
            }

            public static void TestInvalidId(string id, Action<string> manipulation, string testName)
            {
                var exception = Assert.Throws<AchievmentException>(() => manipulation(id), $"Expected to fail with {typeof(AchievmentTypeException)}");

                Assert.AreEqual(exception.Id, id, $"{testName}: Achievment id does not match");
            }

            public static void TestInvalidType<Expected, Actual>(this AchievmentManager manager, string id, string testName) where Expected : AchievmentData where Actual : AchievmentData
            {
                TestInvalidType<Expected, Actual>(id, (id) => manager.GetAchievmentForId<Expected>(id), testName);
            }
            
            public static void TestInvalidType<Expected, Actual>(string id, Action<string> manipulation, string testName) where Expected : AchievmentData where Actual : AchievmentData
            {
                var exception = Assert.Throws<AchievmentTypeException>(() => manipulation(id), $"Expected to fail with {typeof(AchievmentTypeException)}");

                Assert.AreEqual(id, exception.Id, $"{testName}: Achievment id does not match");
                Assert.AreSame(typeof(Expected), exception.Expected, $"{testName}: Target achievment type does not match");
                Assert.AreSame(typeof(Actual), exception.Actual, $"{testName}: Actual achievment type does not match");
            }

        }
    }
}