using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.InputSystem;
[RequireComponent(typeof(Rigidbody), typeof(SphereCollider))]
public sealed class CoinRunLab : MonoBehaviour
{
    [SerializeField] private float acceleration = 4f;
    private Rigidbody body;
    private InputAction move;
    private Vector2 input;
    private RunState state;
    private bool reported;
    private void Awake()
    {
        body = GetComponent<Rigidbody>();
        body.useGravity = false;
        body.constraints = RigidbodyConstraints.FreezePositionY | RigidbodyConstraints.FreezeRotation;
        state = new RunState(3, 15.0);
        move = new InputAction("Move", InputActionType.Value);
        move.AddCompositeBinding("2DVector").With("Up", "<Keyboard>/w").With("Down", "<Keyboard>/s").With("Left", "<Keyboard>/a").With("Right", "<Keyboard>/d");
    }
    private void OnEnable() { if (move != null) move.Enable(); }
    private void OnDisable() { if (move != null) move.Disable(); }
    private void OnDestroy() { if (move != null) move.Dispose(); }
    private void Update()
    {
        if (state.Phase != RunPhase.Running) return;
        input = move.ReadValue<Vector2>();
        state.Tick(Time.deltaTime);
        ReportOutcome();
    }
    private void FixedUpdate()
    {
        if (state.Phase != RunPhase.Running) return;
        body.AddForce(new Vector3(input.x, 0f, input.y) * acceleration, ForceMode.Acceleration);
    }
    private void OnTriggerEnter(Collider other)
    {
        if (!isActiveAndEnabled || state == null) return;
        if (!other.CompareTag("Collectible") || !state.Collect(other.gameObject.GetInstanceID())) return;
        other.gameObject.SetActive(false);
        Debug.Log("Score: " + state.Score + "/3", this);
        ReportOutcome();
    }
    private void ReportOutcome()
    {
        if (reported || state.Phase == RunPhase.Running) return;
        reported = true;
        body.linearVelocity = Vector3.zero;
        body.angularVelocity = Vector3.zero;
        Debug.Log("Run: " + state.Phase, this);
    }
    public enum RunPhase { Running, Won, Lost }
    public sealed class RunState
    {
        private readonly HashSet<int> collected = new HashSet<int>();
        private readonly int target;
        public int Score { get; private set; }
        public double Remaining { get; private set; }
        public RunPhase Phase { get; private set; }
        public RunState(int target, double seconds) { if (target < 1 || seconds <= 0 || double.IsNaN(seconds) || double.IsInfinity(seconds)) throw new ArgumentOutOfRangeException(); this.target = target; Remaining = seconds; }
        public bool Collect(int id) { if (Phase != RunPhase.Running || !collected.Add(id)) return false; Score++; if (Score >= target) Phase = RunPhase.Won; return true; }
        public void Tick(double seconds) { if (seconds < 0 || double.IsNaN(seconds) || double.IsInfinity(seconds)) throw new ArgumentOutOfRangeException(); if (Phase != RunPhase.Running) return; Remaining = Math.Max(0, Remaining - seconds); if (Remaining == 0) Phase = RunPhase.Lost; }
    }
}