using System.Collections.Generic;
using System.IO;
using System.Linq;
using UnityEditor;
using UnityEditor.Animations;
using UnityEngine;

namespace MegaKoop.Game.EditorExtensions
{
    public class AutoAnimatorControllerBuilder : EditorWindow
    {
        private const string ANIM_BASE_PATH = "Assets/Kevin Iglesias/Human Animations/Animations/Male";
        private string controllerSavePath = "Assets/Game/ThirdPersonController.controller";
        private bool assignToSelected = true;

        private AnimationClip idleClip;
        private AnimationClip walkForward, walkBackward, walkLeft, walkRight;
        private AnimationClip walkForwardLeft, walkForwardRight, walkBackwardLeft, walkBackwardRight;
        private AnimationClip crouchIdle;
        private AnimationClip jumpBegin, jumpFall, jumpLand;
        private AnimationClip deathClip;

        [MenuItem("MegaKoop/Animator/Auto Build Controller")]
        public static void ShowWindow()
        {
            var window = GetWindow<AutoAnimatorControllerBuilder>(true, "Auto Animator Builder");
            window.minSize = new Vector2(500, 650);
            window.Show();
        }

        private void OnEnable()
        {
            AutoDiscoverAnimations();
        }

        private void OnGUI()
        {
            EditorGUILayout.LabelField("Automatický Animator Controller Builder", EditorStyles.boldLabel);
            EditorGUILayout.Space(6);

            EditorGUILayout.HelpBox(
                "Tento nástroj automaticky najde animace ve složce Kevin Iglesias a vytvoří kompletní Animator Controller.\n" +
                "Stiskněte 'Najít Animace' pro aktualizaci nebo 'Vytvořit Controller' pro vygenerování.",
                MessageType.Info);

            EditorGUILayout.Space(8);

            if (GUILayout.Button("Najít Animace", GUILayout.Height(30)))
            {
                AutoDiscoverAnimations();
            }

            EditorGUILayout.Space(8);
            EditorGUILayout.LabelField("Nalezené Animace:", EditorStyles.boldLabel);

            DrawClipField("Idle", idleClip);
            DrawClipField("Walk Forward", walkForward);
            DrawClipField("Walk Backward", walkBackward);
            DrawClipField("Walk Left", walkLeft);
            DrawClipField("Walk Right", walkRight);
            DrawClipField("Walk Forward Left", walkForwardLeft);
            DrawClipField("Walk Forward Right", walkForwardRight);
            DrawClipField("Walk Backward Left", walkBackwardLeft);
            DrawClipField("Walk Backward Right", walkBackwardRight);
            DrawClipField("Crouch Idle", crouchIdle);
            DrawClipField("Jump Begin", jumpBegin);
            DrawClipField("Jump Fall", jumpFall);
            DrawClipField("Jump Land", jumpLand);
            DrawClipField("Death", deathClip);

            EditorGUILayout.Space(10);
            EditorGUILayout.LabelField("Nastavení:", EditorStyles.boldLabel);

            assignToSelected = EditorGUILayout.Toggle("Přiřadit na vybraný objekt", assignToSelected);

            EditorGUILayout.BeginHorizontal();
            controllerSavePath = EditorGUILayout.TextField("Cesta uložení", controllerSavePath);
            if (GUILayout.Button("...", GUILayout.Width(32)))
            {
                string path = EditorUtility.SaveFilePanelInProject(
                    "Uložit Animator Controller",
                    "ThirdPersonController",
                    "controller",
                    "Vyberte umístění pro Animator Controller");
                if (!string.IsNullOrEmpty(path)) controllerSavePath = path;
            }
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.Space(12);

            using (new EditorGUI.DisabledScope(!CanBuild()))
            {
                if (GUILayout.Button("Vytvořit Animator Controller", GUILayout.Height(40)))
                {
                    BuildController();
                }
            }

            if (!CanBuild())
            {
                EditorGUILayout.HelpBox("Pro vytvoření controlleru musí být nalezeny minimálně: Idle, Walk Forward/Backward/Left/Right, Jump Begin/Fall/Land.", MessageType.Warning);
            }
        }

        private void DrawClipField(string label, AnimationClip clip)
        {
            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.LabelField(label, GUILayout.Width(150));
            GUI.enabled = false;
            EditorGUILayout.ObjectField(clip, typeof(AnimationClip), false);
            GUI.enabled = true;
            EditorGUILayout.EndHorizontal();
        }

        private void AutoDiscoverAnimations()
        {
            Debug.Log("Hledám animace v Kevin Iglesias složce...");

            idleClip = LoadAnimationClip("Idles/HumanM@Idle01.fbx");
            
            walkForward = LoadAnimationClip("Movement/Walk/HumanM@Walk01_Forward.fbx");
            walkBackward = LoadAnimationClip("Movement/Walk/HumanM@Walk01_Backward.fbx");
            walkLeft = LoadAnimationClip("Movement/Walk/HumanM@Walk01_Left.fbx");
            walkRight = LoadAnimationClip("Movement/Walk/HumanM@Walk01_Right.fbx");
            walkForwardLeft = LoadAnimationClip("Movement/Walk/HumanM@Walk01_ForwardLeft.fbx");
            walkForwardRight = LoadAnimationClip("Movement/Walk/HumanM@Walk01_ForwardRight.fbx");
            walkBackwardLeft = LoadAnimationClip("Movement/Walk/HumanM@Walk01_BackwardLeft.fbx");
            walkBackwardRight = LoadAnimationClip("Movement/Walk/HumanM@Walk01_BackwardRight.fbx");

            crouchIdle = LoadAnimationClip("Movement/Crouch/HumanM@Crouch01_Idle.fbx");

            jumpBegin = LoadAnimationClip("Movement/Jump/HumanM@Jump01 - Begin.fbx");
            jumpFall = LoadAnimationClip("Movement/Jump/HumanM@Fall01.fbx");
            jumpLand = LoadAnimationClip("Movement/Jump/HumanM@Jump01 - Land.fbx");

            deathClip = LoadAnimationClip("Combat/HumanM@Death01.fbx");

            Debug.Log("Hledání dokončeno.");
            Repaint();
        }

        private AnimationClip LoadAnimationClip(string relativePath)
        {
            string fullPath = Path.Combine(ANIM_BASE_PATH, relativePath).Replace("\\", "/");
            
            // Load all assets from the FBX file
            var assets = AssetDatabase.LoadAllAssetsAtPath(fullPath);
            if (assets == null || assets.Length == 0)
            {
                Debug.LogWarning($"Nelze najít assets v: {fullPath}");
                return null;
            }

            // Find animation clips (excluding preview clips)
            var clips = new List<AnimationClip>();
            foreach (var asset in assets)
            {
                if (asset is AnimationClip clip && !clip.name.Contains("__preview__"))
                {
                    clips.Add(clip);
                }
            }

            if (clips.Count == 0)
            {
                Debug.LogWarning($"Žádné AnimationClip v: {fullPath}");
                return null;
            }

            // Return the first valid clip
            var result = clips[0];
            Debug.Log($"Načteno: {result.name} z {fullPath}");
            return result;
        }

        private bool CanBuild()
        {
            return idleClip != null &&
                   walkForward != null && walkBackward != null && walkLeft != null && walkRight != null &&
                   jumpBegin != null && jumpFall != null && jumpLand != null &&
                   !string.IsNullOrEmpty(controllerSavePath);
        }

        private void BuildController()
        {
            Debug.Log("=== Vytváření Animator Controller ===");
            Debug.Log($"Idle: {(idleClip != null ? idleClip.name : "CHYBÍ")}");
            Debug.Log($"Walk Forward: {(walkForward != null ? walkForward.name : "CHYBÍ")}");
            Debug.Log($"Walk Backward: {(walkBackward != null ? walkBackward.name : "CHYBÍ")}");
            Debug.Log($"Walk Left: {(walkLeft != null ? walkLeft.name : "CHYBÍ")}");
            Debug.Log($"Walk Right: {(walkRight != null ? walkRight.name : "CHYBÍ")}");
            Debug.Log($"Jump Begin: {(jumpBegin != null ? jumpBegin.name : "CHYBÍ")}");
            Debug.Log($"Jump Fall: {(jumpFall != null ? jumpFall.name : "CHYBÍ")}");
            Debug.Log($"Jump Land: {(jumpLand != null ? jumpLand.name : "CHYBÍ")}");
            
            var controller = AnimatorController.CreateAnimatorControllerAtPath(controllerSavePath);
            AddParameters(controller);

            var root = controller.layers[0].stateMachine;

            // States
            var idle = root.AddState("Idle", new Vector3(250, 50, 0));
            idle.motion = idleClip;
            root.defaultState = idle;

            var move = root.AddState("Move", new Vector3(250, 150, 0));
            move.motion = CreateMoveBlendTree(controller);

            AnimatorState crouch = null;
            if (crouchIdle != null)
            {
                crouch = root.AddState("Crouch", new Vector3(250, 250, 0));
                crouch.motion = crouchIdle;
            }

            var jumpBeginState = root.AddState("Jump Begin", new Vector3(500, 50, 0));
            jumpBeginState.motion = jumpBegin;

            var jumpFallState = root.AddState("Jump Fall", new Vector3(500, 150, 0));
            jumpFallState.motion = jumpFall;

            var jumpLandState = root.AddState("Jump Land", new Vector3(500, 250, 0));
            jumpLandState.motion = jumpLand;

            AnimatorState death = null;
            if (deathClip != null)
            {
                death = root.AddState("Death", new Vector3(250, 350, 0));
                death.motion = deathClip;
            }

            // Transitions: Idle <-> Move
            var idleToMove = idle.AddTransition(move);
            idleToMove.hasExitTime = false;
            idleToMove.duration = 0.1f;
            idleToMove.AddCondition(AnimatorConditionMode.Greater, 0.1f, "Speed");

            var moveToIdle = move.AddTransition(idle);
            moveToIdle.hasExitTime = false;
            moveToIdle.duration = 0.1f;
            moveToIdle.AddCondition(AnimatorConditionMode.Less, 0.1f, "Speed");

            // Crouch transitions
            if (crouch != null)
            {
                var anyToCrouch = root.AddAnyStateTransition(crouch);
                anyToCrouch.hasExitTime = false;
                anyToCrouch.duration = 0.1f;
                anyToCrouch.AddCondition(AnimatorConditionMode.If, 0f, "IsCrouching");

                var crouchToIdle = crouch.AddTransition(idle);
                crouchToIdle.hasExitTime = false;
                crouchToIdle.duration = 0.1f;
                crouchToIdle.AddCondition(AnimatorConditionMode.IfNot, 0f, "IsCrouching");
                crouchToIdle.AddCondition(AnimatorConditionMode.Less, 0.1f, "Speed");

                var crouchToMove = crouch.AddTransition(move);
                crouchToMove.hasExitTime = false;
                crouchToMove.duration = 0.1f;
                crouchToMove.AddCondition(AnimatorConditionMode.IfNot, 0f, "IsCrouching");
                crouchToMove.AddCondition(AnimatorConditionMode.Greater, 0.1f, "Speed");
            }

            // Jump transitions: AnyState -> Jump Begin
            var anyToJumpBegin = root.AddAnyStateTransition(jumpBeginState);
            anyToJumpBegin.hasExitTime = false;
            anyToJumpBegin.duration = 0.05f;
            anyToJumpBegin.canTransitionToSelf = false;
            anyToJumpBegin.AddCondition(AnimatorConditionMode.If, 0f, "Jump");

            // Jump Begin -> Jump Fall (automatic after animation)
            var jumpBeginToFall = jumpBeginState.AddTransition(jumpFallState);
            jumpBeginToFall.hasExitTime = true;
            jumpBeginToFall.exitTime = 0.8f;
            jumpBeginToFall.duration = 0.05f;
            jumpBeginToFall.hasFixedDuration = true;

            // Jump Fall -> Jump Land (when grounded)
            var jumpFallToLand = jumpFallState.AddTransition(jumpLandState);
            jumpFallToLand.hasExitTime = false;
            jumpFallToLand.duration = 0.05f;
            jumpFallToLand.hasFixedDuration = true;
            jumpFallToLand.AddCondition(AnimatorConditionMode.If, 0f, "IsGrounded");

            // Jump Land -> Idle (exit time)
            var jumpLandToIdle = jumpLandState.AddTransition(idle);
            jumpLandToIdle.hasExitTime = true;
            jumpLandToIdle.exitTime = 0.7f;
            jumpLandToIdle.duration = 0.1f;
            jumpLandToIdle.hasFixedDuration = true;
            jumpLandToIdle.AddCondition(AnimatorConditionMode.Less, 0.1f, "Speed");

            // Jump Land -> Move (exit time)
            var jumpLandToMove = jumpLandState.AddTransition(move);
            jumpLandToMove.hasExitTime = true;
            jumpLandToMove.exitTime = 0.7f;
            jumpLandToMove.duration = 0.1f;
            jumpLandToMove.hasFixedDuration = true;
            jumpLandToMove.AddCondition(AnimatorConditionMode.Greater, 0.1f, "Speed");

            // Death
            if (death != null)
            {
                var anyToDeath = root.AddAnyStateTransition(death);
                anyToDeath.hasExitTime = false;
                anyToDeath.duration = 0.2f;
                anyToDeath.AddCondition(AnimatorConditionMode.If, 0f, "IsDead");
            }

            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();

            Debug.Log($"Animator Controller vytvořen: {controllerSavePath}");

            if (assignToSelected && Selection.activeGameObject != null)
            {
                var go = Selection.activeGameObject;
                var anim = go.GetComponent<Animator>();
                if (anim == null) anim = go.AddComponent<Animator>();
                anim.runtimeAnimatorController = controller;

                Debug.Log($"Controller přiřazen na: {go.name}");
            }

            EditorGUIUtility.PingObject(controller);
        }

        private void AddParameters(AnimatorController controller)
        {
            controller.AddParameter("MoveX", AnimatorControllerParameterType.Float);
            controller.AddParameter("MoveZ", AnimatorControllerParameterType.Float);
            controller.AddParameter("Speed", AnimatorControllerParameterType.Float);
            controller.AddParameter("IsGrounded", AnimatorControllerParameterType.Bool);
            controller.AddParameter("IsCrouching", AnimatorControllerParameterType.Bool);
            controller.AddParameter("IsDead", AnimatorControllerParameterType.Bool);
            controller.AddParameter("Jump", AnimatorControllerParameterType.Trigger);
        }

        private Motion CreateMoveBlendTree(AnimatorController controller)
        {
            var tree = new BlendTree
            {
                name = "MoveTree",
                blendType = BlendTreeType.FreeformCartesian2D,
                useAutomaticThresholds = false,
                blendParameter = "MoveX",
                blendParameterY = "MoveZ"
            };

            AssetDatabase.AddObjectToAsset(tree, controller);

            var children = new List<ChildMotion>();

            if (walkForward != null) children.Add(new ChildMotion { motion = walkForward, position = new Vector2(0f, 1f), timeScale = 1f });
            if (walkBackward != null) children.Add(new ChildMotion { motion = walkBackward, position = new Vector2(0f, -1f), timeScale = 1f });
            if (walkLeft != null) children.Add(new ChildMotion { motion = walkLeft, position = new Vector2(-1f, 0f), timeScale = 1f });
            if (walkRight != null) children.Add(new ChildMotion { motion = walkRight, position = new Vector2(1f, 0f), timeScale = 1f });

            if (walkForwardLeft != null) children.Add(new ChildMotion { motion = walkForwardLeft, position = new Vector2(-0.707f, 0.707f), timeScale = 1f });
            if (walkForwardRight != null) children.Add(new ChildMotion { motion = walkForwardRight, position = new Vector2(0.707f, 0.707f), timeScale = 1f });
            if (walkBackwardLeft != null) children.Add(new ChildMotion { motion = walkBackwardLeft, position = new Vector2(-0.707f, -0.707f), timeScale = 1f });
            if (walkBackwardRight != null) children.Add(new ChildMotion { motion = walkBackwardRight, position = new Vector2(0.707f, -0.707f), timeScale = 1f });

            tree.children = children.ToArray();
            return tree;
        }
    }
}