#nullable enable

using System.Collections;
using System.Linq;
using NUnit.Framework;
using ReplacedPerson.Runtime;
using TMPro;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.SceneManagement;
using UnityEngine.TestTools;
using UnityEngine.UI;

namespace ReplacedPerson.Tests
{
    public sealed class ReplacedPersonSceneTests
    {
        [UnityTest]
        public IEnumerator EntryScene_HasResponsiveCanvasAndAllScreens()
        {
            SceneManager.LoadScene("ReplacedPerson");
            yield return null;
            var root = GameObject.Find("ReplacedPersonDemo");
            Assert.That(root, Is.Not.Null);
            var camera = Camera.main;
            Assert.That(camera, Is.Not.Null);
            Assert.That(camera!.enabled, Is.True);
            Assert.That(camera.cullingMask, Is.Zero);
            var canvas = root.transform.Find("Canvas")!.GetComponent<Canvas>();
            var scaler = canvas.GetComponent<CanvasScaler>();
            Assert.That(canvas.renderMode, Is.EqualTo(RenderMode.ScreenSpaceOverlay));
            Assert.That(scaler.referenceResolution, Is.EqualTo(new Vector2(1920, 1080)));
            Assert.That(root.transform.Find("Canvas/SafeAreaRoot")!.GetComponent<ReplacedSafeArea>(), Is.Not.Null);
            Assert.That(root.GetComponentsInChildren<TMP_Text>(true), Has.Length.GreaterThan(20));
            Assert.That(root.GetComponentsInChildren<Button>(true), Has.Length.GreaterThan(12));
            Assert.That(root.transform.Find("Canvas/SafeAreaRoot/Screens/BattleScreen/LogPanel/CardDetailText"), Is.Not.Null);
            foreach (var audioName in new[] { "ui_click", "card_draw", "card_select", "lock", "dice_roll", "hit", "victory", "defeat", "error" })
                Assert.That(Resources.Load<AudioClip>("ReplacedPersonAudio/" + audioName), Is.Not.Null, audioName);
        }

        [UnityTest]
        public IEnumerator GameService_CompletesARealRoundWithAi()
        {
            var service = new ReplacedPersonGameService();
            var match = service.StartAi("greed.tutorial", 123);
            while ((match.State.Phase == Core.ReplacedMatchPhase.AwaitingLead ? match.State.LeadPlayer : 1 - match.State.LeadPlayer) != 0)
                yield return null;
            var player = match.State.Players[0];
            var submission = new Core.ReplacedTurnSubmission
            {
                NormalCardIds = new System.Collections.Generic.List<string> { player.NormalHand[0] },
                EndCardIds = new System.Collections.Generic.List<string> { player.EndHand[0] },
                RerollSlot = 0
            };
            Assert.That(service.SubmitPlayer(submission).Accepted, Is.True);
            Assert.That(match.State.Round, Is.GreaterThanOrEqualTo(2));
            service.Dispose();
            yield return null;
        }

        [UnityTest]
        public IEnumerator DraggingCard_RestoresItsHandOrderAndLayoutPosition()
        {
            var canvasObject = new GameObject("DragTestCanvas", typeof(RectTransform), typeof(Canvas));
            canvasObject.GetComponent<Canvas>().renderMode = RenderMode.ScreenSpaceOverlay;
            var hand = new GameObject("Hand", typeof(RectTransform), typeof(HorizontalLayoutGroup));
            hand.transform.SetParent(canvasObject.transform, false);
            var handRect = hand.GetComponent<RectTransform>();
            handRect.sizeDelta = new Vector2(480, 160);
            var layout = hand.GetComponent<HorizontalLayoutGroup>();
            layout.spacing = 8;
            layout.childControlWidth = false;
            layout.childControlHeight = false;
            layout.childForceExpandWidth = false;
            layout.childForceExpandHeight = false;

            CreateDragCard(hand.transform, "CardA");
            var dragged = CreateDragCard(hand.transform, "CardB");
            CreateDragCard(hand.transform, "CardC");
            Canvas.ForceUpdateCanvases();
            LayoutRebuilder.ForceRebuildLayoutImmediate(handRect);

            var originalIndex = dragged.transform.GetSiblingIndex();
            var originalPosition = dragged.GetComponent<RectTransform>().anchoredPosition;
            var clicked = false;
            dragged.GetComponent<Button>().onClick.AddListener(() => clicked = true);
            var eventSystem = EventSystem.current;
            var ownsEventSystem = eventSystem == null;
            if (eventSystem == null)
                eventSystem = new GameObject("DragTestEventSystem", typeof(EventSystem)).GetComponent<EventSystem>();
            var pointer = new PointerEventData(eventSystem) { position = new Vector2(540, 360), delta = new Vector2(80, 30) };
            var handler = dragged.GetComponent<ReplacedCardDragHandler>();

            handler.OnBeginDrag(pointer);
            handler.OnDrag(pointer);
            Assert.That(dragged.transform.GetSiblingIndex(), Is.EqualTo(originalIndex));
            Assert.That(dragged.GetComponent<RectTransform>().anchoredPosition, Is.EqualTo(originalPosition));
            Assert.That(GameObject.Find("CardDragGhost"), Is.Not.Null);
            handler.OnEndDrag(pointer);

            Assert.That(dragged.transform.GetSiblingIndex(), Is.EqualTo(originalIndex));
            Assert.That(dragged.GetComponent<RectTransform>().anchoredPosition, Is.EqualTo(originalPosition));
            Assert.That(clicked, Is.True);

            Object.Destroy(canvasObject);
            if (ownsEventSystem) Object.Destroy(eventSystem.gameObject);
            yield return null;
        }

        [UnityTest]
        public IEnumerator DraggingConfiguredCard_ReportsDropWithoutInvokingClick()
        {
            var canvasObject = new GameObject("ConfiguredDragCanvas", typeof(RectTransform), typeof(Canvas));
            canvasObject.GetComponent<Canvas>().renderMode = RenderMode.ScreenSpaceOverlay;
            var dragged = CreateDragCard(canvasObject.transform, "ConfiguredCard");
            var clicked = false;
            var dropped = false;
            var dropPosition = Vector2.zero;
            dragged.GetComponent<Button>().onClick.AddListener(() => clicked = true);
            dragged.GetComponent<ReplacedCardDragHandler>().Configure(position =>
            {
                dropped = true;
                dropPosition = position;
            });
            var eventSystem = EventSystem.current;
            var ownsEventSystem = eventSystem == null;
            if (eventSystem == null)
                eventSystem = new GameObject("ConfiguredDragEventSystem", typeof(EventSystem)).GetComponent<EventSystem>();
            var start = new PointerEventData(eventSystem) { position = new Vector2(100, 100) };
            var end = new PointerEventData(eventSystem) { position = new Vector2(240, 140), delta = new Vector2(140, 40) };
            var handler = dragged.GetComponent<ReplacedCardDragHandler>();

            handler.OnBeginDrag(start);
            handler.OnDrag(end);
            handler.OnEndDrag(end);

            Assert.That(dropped, Is.True);
            Assert.That(clicked, Is.False);
            Assert.That(dropPosition, Is.EqualTo(end.position));
            yield return null;
            Assert.That(GameObject.Find("CardDragGhost"), Is.Null);

            Object.Destroy(canvasObject);
            if (ownsEventSystem) Object.Destroy(eventSystem.gameObject);
            yield return null;
        }

        [UnityTest]
        public IEnumerator BattleHand_DuplicateCopyCancelsAndDragChangesExecutionOrder()
        {
            SceneManager.LoadScene("ReplacedPerson");
            yield return null;
            var root = GameObject.Find("ReplacedPersonDemo");
            Assert.That(root, Is.Not.Null);
            var safe = root.transform.Find("Canvas/SafeAreaRoot")!;
            safe.Find("Screens/TitleScreen/Actions/ContinueButton")!.GetComponent<Button>().onClick.Invoke();
            safe.Find("Screens/ChapterScreen/Footer/StartBattleButton")!.GetComponent<Button>().onClick.Invoke();
            var phaseMotion = safe.Find("Screens/BattleScreen")!.GetComponent<ReplacedBattlePhaseMotion>();
            Assert.That(phaseMotion, Is.Not.Null);
            Assert.That(phaseMotion!.IsVisible, Is.True);
            Assert.That(phaseMotion.CurrentTitle, Is.EqualTo("先手骰"));

            var match = ReplacedPersonGameService.Current!.Match!;
            var player = match.State.Players[0];
            player.NormalHand.Clear();
            player.NormalHand.AddRange(new[] { "counter.instant", "counter.instant", "counter.stance", "attack.kill", "dodge.flash" });
            player.EndHand.Clear();
            player.EndHand.Add("end.inherit");
            root.SendMessage("RefreshBattle", SendMessageOptions.DontRequireReceiver);
            yield return null;

            var selection = safe.Find("Screens/BattleScreen/PlayerArea/SelectionText")!.GetComponent<TMP_Text>();
            Card(safe, 0).GetComponent<Button>().onClick.Invoke();
            yield return null;
            Assert.That(selection.text, Does.Contain("1. 一瞬千击"));
            Assert.That(Card(safe, 0).Find("Label")!.GetComponent<TMP_Text>().text, Does.StartWith("[1] 一瞬千击"));
            Assert.That(Card(safe, 1).Find("Label")!.GetComponent<TMP_Text>().text, Does.StartWith("一瞬千击"));

            Card(safe, 0).GetComponent<Button>().onClick.Invoke();
            yield return null;
            Assert.That(selection.text, Does.Contain("普通牌执行：未选择"));

            foreach (var handIndex in new[] { 0, 2, 3 })
            {
                Card(safe, handIndex).GetComponent<Button>().onClick.Invoke();
                yield return null;
            }
            Assert.That(selection.text, Does.Contain("1. 一瞬千击 → 2. 架势 → 3. 杀"));

            var source = Card(safe, 3);
            var target = Card(safe, 0);
            var sourceRect = (RectTransform)source;
            var targetRect = (RectTransform)target;
            var originalPosition = sourceRect.anchoredPosition;
            var startPosition = RectTransformUtility.WorldToScreenPoint(null, sourceRect.TransformPoint(sourceRect.rect.center));
            var targetCenter = RectTransformUtility.WorldToScreenPoint(null, targetRect.TransformPoint(targetRect.rect.center));
            var endPosition = new Vector2(targetCenter.x - targetRect.rect.width * .25f, targetCenter.y);
            var begin = new PointerEventData(EventSystem.current) { position = startPosition };
            var end = new PointerEventData(EventSystem.current) { position = endPosition, delta = endPosition - startPosition };
            var handler = source.GetComponent<ReplacedCardDragHandler>();

            handler.OnBeginDrag(begin);
            handler.OnDrag(end);
            handler.OnEndDrag(end);
            Assert.That(sourceRect.anchoredPosition, Is.EqualTo(originalPosition));
            yield return null;

            Assert.That(selection.text, Does.Contain("1. 杀 → 2. 一瞬千击 → 3. 架势"));
            Assert.That(Card(safe, 3).Find("Label")!.GetComponent<TMP_Text>().text, Does.StartWith("[1] 杀"));
            Assert.That(Card(safe, 0).Find("Label")!.GetComponent<TMP_Text>().text, Does.StartWith("[2] 一瞬千击"));
            Assert.That(Card(safe, 2).Find("Label")!.GetComponent<TMP_Text>().text, Does.StartWith("[3] 架势"));
            Assert.That(GameObject.Find("CardDragGhost"), Is.Null);
            Assert.That(match.State.Players[0].NormalHand.Count(id => id == "counter.instant"), Is.EqualTo(2));
        }

        [UnityTest]
        public IEnumerator SlotResolutionMotion_PresentsClashDiceAndFinalResult()
        {
            var slot = new GameObject("AnimatedSlot", typeof(RectTransform), typeof(CanvasRenderer), typeof(Image));
            var textObject = new GameObject("Text", typeof(RectTransform), typeof(CanvasRenderer), typeof(TextMeshProUGUI));
            textObject.transform.SetParent(slot.transform, false);
            var textRect = textObject.GetComponent<RectTransform>();
            textRect.anchorMin = Vector2.zero;
            textRect.anchorMax = Vector2.one;
            var motion = slot.AddComponent<ReplacedSlotResolutionMotion>();
            motion.Play(new Core.ReplacedSlotResolution
            {
                SlotIndex = 0,
                PlayerOneType = Core.ReplacedEffectType.Counter,
                PlayerTwoType = Core.ReplacedEffectType.Attack,
                PlayerOneRoll = 5,
                PlayerTwoRoll = 2,
                PlayerOneValue = 17,
                PlayerTwoValue = 8,
                DamageToPlayerTwo = 6,
                Summary = "反击 6"
            }, 0);

            yield return new WaitForSecondsRealtime(.72f);
            Assert.That(motion.IsPlaying, Is.True);
            Assert.That(slot.transform.Find("PlayerToken")!.gameObject.activeSelf, Is.True);
            Assert.That(textObject.GetComponent<TMP_Text>().text, Does.Contain("投掷中"));
            Assert.That(slot.transform.Find("PlayerToken/Label")!.GetComponent<TMP_Text>().text, Does.Contain("D6"));
            yield return new WaitForSecondsRealtime(1.9f);
            Assert.That(motion.IsPlaying, Is.False);
            Assert.That(textObject.GetComponent<TMP_Text>().text, Does.Contain("反击 6"));
            Assert.That(slot.transform.Find("PlayerToken")!.gameObject.activeSelf, Is.False);
            Object.Destroy(slot);
            yield return null;
        }

        private static GameObject CreateDragCard(Transform parent, string name)
        {
            var card = new GameObject(name, typeof(RectTransform), typeof(CanvasRenderer), typeof(Image), typeof(Button),
                typeof(LayoutElement), typeof(ReplacedCardDragHandler));
            card.transform.SetParent(parent, false);
            card.GetComponent<RectTransform>().sizeDelta = new Vector2(120, 140);
            card.GetComponent<LayoutElement>().preferredWidth = 120;
            return card;
        }

        private static Transform Card(Transform safeArea, int handIndex)
        {
            return safeArea.Find("Screens/BattleScreen/PlayerArea/NormalHand/Normal_" + handIndex)!;
        }
    }
}