using System;
using Godot;

namespace AceFieldNewHorizon.Scripts.Entities;

public partial class Player : CharacterBody2D
{
    [Export] public float MaxSpeed = 400.0f;
    [Export] public float SprintMultiplier = 1.8f; // 80% faster when sprinting
    [Export] public float Acceleration = 1500.0f;
    [Export] public float SprintAcceleration = 1800.0f; // Slightly faster acceleration when sprinting
    [Export] public float Deceleration = 1200.0f;
    [Export] public float RotationSpeed = 3.0f;

    public override void _Process(double delta)
    {
        // Get direction to mouse and calculate angle
        var mousePos = GetGlobalMousePosition();
        var direction = GlobalPosition.DirectionTo(mousePos);
        Rotation = direction.Angle();
    }

    public override void _PhysicsProcess(double delta)
    {
        // Get movement input
        var moveForward = Input.GetActionStrength("move_up") - Input.GetActionStrength("move_down");
        var moveHorizontal = Input.GetActionStrength("move_right") - Input.GetActionStrength("move_left");
        var isSprinting = Input.IsActionPressed("move_sprint");
        
        // Calculate movement parameters based on sprint state
        var currentMaxSpeed = isSprinting ? MaxSpeed * SprintMultiplier : MaxSpeed;
        var currentAcceleration = isSprinting ? SprintAcceleration : Acceleration;
        
        // Calculate desired movement direction
        var forwardVector = Vector2.Right.Rotated(Rotation);
        var rightVector = new Vector2(-forwardVector.Y, forwardVector.X);
        
        // Calculate target velocity based on input
        var targetVelocity = (forwardVector * moveForward + rightVector * moveHorizontal).Normalized() * currentMaxSpeed;
        
        // Apply acceleration or deceleration
        var currentSpeed = Velocity.Length();
        var isAccelerating = targetVelocity != Vector2.Zero;
        
        if (isAccelerating)
        {
            // Accelerate towards target velocity
            Velocity = Velocity.MoveToward(targetVelocity, (float)(currentAcceleration * delta));
        }
        else
        {
            // Apply deceleration when no input
            if (currentSpeed > 0)
            {
                var decelAmount = (float)(Deceleration * delta);
                if (currentSpeed <= decelAmount)
                    Velocity = Vector2.Zero;
                else
                    Velocity = Velocity.Normalized() * (currentSpeed - decelAmount);
            }
        }
        
        // Apply the movement
        MoveAndSlide();
    }
}