using UnityEngine;

#if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
using UnityEngine.InputSystem;
#endif

public enum InputSourceType
{
    None,
    Mouse,
    Touch
}

public struct InputEvent
{
    public bool IsPressed;          // true = down, false = up
    public Vector3 Position;        // pointer/touch position
    public InputSourceType Source;  // Mouse or Touch
}

public static class CrossPlatformInput
{
    /// <summary>
    /// Detects if a primary press just began this frame (mouse or touch).
    /// </summary>
    public static InputEvent GetPrimaryDown()
    {
#if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
        // New Input System
        if (Touchscreen.current != null && Touchscreen.current.primaryTouch.press.wasPressedThisFrame)
            return new InputEvent { IsPressed = true, Position = Touchscreen.current.primaryTouch.position.ReadValue(), Source = InputSourceType.Touch };

        if (Mouse.current?.leftButton.wasPressedThisFrame == true)
            return new InputEvent { IsPressed = true, Position = Mouse.current.position.ReadValue(), Source = InputSourceType.Mouse };

        return default;
#else
        // Legacy Input Manager
        if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
            return new InputEvent { IsPressed = true, Position = Input.GetTouch(0).position, Source = InputSourceType.Touch };

        if (Input.GetMouseButtonDown(0))
            return new InputEvent { IsPressed = true, Position = Input.mousePosition, Source = InputSourceType.Mouse };

        return default;
#endif
    }

    /// <summary>
    /// Detects if a primary press just ended this frame (mouse or touch).
    /// </summary>
    public static InputEvent GetPrimaryUp()
    {
#if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
        // New Input System
        if (Touchscreen.current != null && Touchscreen.current.primaryTouch.press.wasReleasedThisFrame)
            return new InputEvent { IsPressed = false, Position = Touchscreen.current.primaryTouch.position.ReadValue(), Source = InputSourceType.Touch };

        if (Mouse.current?.leftButton.wasReleasedThisFrame == true)
            return new InputEvent { IsPressed = false, Position = Mouse.current.position.ReadValue(), Source = InputSourceType.Mouse };

        return default;
#else
        // Legacy Input Manager
        if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Ended)
            return new InputEvent { IsPressed = false, Position = Input.GetTouch(0).position, Source = InputSourceType.Touch };

        if (Input.GetMouseButtonUp(0))
            return new InputEvent { IsPressed = false, Position = Input.mousePosition, Source = InputSourceType.Mouse };

        return default;
#endif
    }

    /// <summary>
    /// Gets current position of primary pointer (mouse or touch).
    /// Returns Vector3.zero if no input is active.
    /// </summary>
    public static Vector3 GetPrimaryPosition()
    {
#if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
        if (Touchscreen.current != null)
            return Touchscreen.current.primaryTouch.position.ReadValue();

        if (Mouse.current != null)
            return Mouse.current.position.ReadValue();

        return Vector3.zero;
#else
        if (Input.touchCount > 0)
            return Input.GetTouch(0).position;

        return Input.mousePosition;
#endif
    }
}