using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

[SelectionBase]
public class Player : MonoBehaviour {
  [Header("Asset/Prefab")]
  [SerializeField] public BuilderHandlerRunner Builder;

  [Header("Movement")]
  [SerializeField] private Rigidbody2D RigidBody;
  [SerializeField] private Animator Animator;
  [SerializeField] private SpriteRenderer Renderer;

  [Header("Character Class")]
  [SerializeField] private ParticleSystem Aura;
  [SerializeField] private GameObject[] ClassIndicators;

  [Header("Movement Attributes")]
  [SerializeField] private float MoveSpeed = 8;
  [SerializeField] private float DashMultiplier = 60;
  [SerializeField] private float DriftSpeed = 60;
  [SerializeField] private float DriftFactorial = 0.85f;

  [Header("VFX")]
  [SerializeField] private GameObject VfxDash;
  private VfxHandlerBase VfxDashHandler;

  private Vector2 MoveDirection = Vector2.zero;
  private Directions FaceDir = Directions.Down;

  private bool isDashing;
  private Vector2 DriftDirection = Vector2.zero;
  private float Drift = 0;

  private readonly int AnimMoveRight = Animator.StringToHash("Anim_Player_MoveRight");
  private readonly int AnimIdleRight = Animator.StringToHash("Anim_Player_IdleRight");


  private enum Directions { Left, Right, Up, Down }

  void Awake() {
    Builder = GetComponent<BuilderHandlerRunner>();
    VfxDashHandler = new VfxHandlerBase(VfxDash, 5, 5);
    SetClass(1);
  }

  private void Update() {
    GatherInput();
    KeyPressActions();
  }
  private void GatherInput() {
    MoveDirection.x = Input.GetAxisRaw("Horizontal");
    MoveDirection.y = Input.GetAxisRaw("Vertical");
  }

  private void KeyPressActions() {
    if (Input.GetKeyDown(KeyCode.LeftShift) || Input.GetKeyDown(KeyCode.RightShift)) {
      Dash(MoveDirection);
    } else if (Input.GetKeyDown(KeyCode.F1)) {
      SetClass(0);
    } else if (Input.GetKeyDown(KeyCode.F2)) {
      SetClass(1);
    } else if (Input.GetKeyDown(KeyCode.F3)) {
      SetClass(2);
    } else if (Input.GetKeyDown(KeyCode.F4)) {
      SetClass(3);
    }
  }

  private void Dash(Vector2 direction) {
    if (Drift > 0.5f) return;
    isDashing = true;

    RigidBody.linearVelocity = direction.normalized * MoveSpeed * DashMultiplier;
    float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg + 180;
    if (direction.normalized != Vector2.zero)
      VfxDashHandler.PlayAll(this.transform.position, Quaternion.Euler(0f, 0f, angle));
    DriftDirection = direction.normalized;
    Drift = DriftSpeed;
    isDashing = false;
  }

  private void SetClass(int classIdx) {
    Builder.SetBuildMode(classIdx == 3);

    foreach (var (indicator, i) in ClassIndicators.Select((obj, i) => (obj, i)))
      if (i != classIdx) {
        indicator.transform.localScale = Vector3.one;
        indicator.transform.rotation = Quaternion.identity;
      } else {
        indicator.transform.localScale = Vector3.one * 2;
        indicator.transform.rotation = Quaternion.AngleAxis(90, Vector3.forward);
      }

    RawImage image = ClassIndicators[classIdx].GetComponent<RawImage>();
    var main = Aura.main; 
    main.startColor = image.color;
  }



  private void FixedUpdate() {
    MovementUpdate();
    CalculateFacingDirection();
    UpdateAnimation();
  }

  private void MovementUpdate() {
    if (isDashing) return;

    RigidBody.linearVelocity = MoveDirection.normalized * MoveSpeed;
    if (Drift > 0.2f) {
      RigidBody.linearVelocity += DriftDirection * Drift;
      Drift *= DriftFactorial;
    } else {
      Drift = 0f;
    }
  }


  private void CalculateFacingDirection() {
    if (MoveDirection.x != 0)
      if (MoveDirection.x < 0)
        FaceDir = Directions.Left;
      else
        FaceDir = Directions.Right;
  }

  private void UpdateAnimation() {
    Renderer.flipX = (FaceDir == Directions.Left);
    Animator.CrossFade((MoveDirection.sqrMagnitude > 0) ? AnimMoveRight : AnimIdleRight, 0);
  }



  void OnDrawGizmos() {
  }









  public List<CharacterClass> classes; // assign in Inspector

  [HideInInspector] public int maxHealth;
  [HideInInspector] public int maxMana;
  [HideInInspector] public float attackPower;
  [HideInInspector] public List<Ability> abilities;

  //void Awake() {
  //  //InitializeCharacter();
  //}

  void InitializeCharacter() {
    maxHealth = 0;
    maxMana = 0;
    attackPower = 1f;
    abilities = new List<Ability>();

    foreach (var cc in classes) {
      maxHealth += cc.baseHealth;
      maxMana += cc.baseMana;
      attackPower *= cc.attackMultiplier;
      abilities.AddRange(cc.abilities);
    }

    Debug.Log($"{name} initialized as {string.Join(", ", classes.ConvertAll(c => c.className))} with {abilities.Count} abilities.");
  }

  public void UseAbility(int index) {
    if (index < 0 || index >= abilities.Count) return;
    var ability = abilities[index];
    ability.Use(this);
  }
}