using System;
using UnityEngine;
using UnityEngine.InputSystem;

public class CameraController : MonoBehaviour
{
    [SerializeField] private float moveSpeed;
    [SerializeField] private float rotationSpeed;
    [SerializeField] private float zoomSpeed;
    [SerializeField] private float minZoom;
    [SerializeField] private float maxZoom;
    [SerializeField] private Texture2D defaultCursor, buildCursor, destroyCursor, attackCursor, interactCursor, constructionCursor;
    private Vector2 moveInput;
    private float rotateInput;
    private float zoomInput;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        Cursor.lockState = CursorLockMode.Confined;
    }

    // Update is called once per frame
    void Update()
    {
        ApplyCursorTexture();
        ApplyMovement();
        ApplyRotation();
        ApplyZoom();
    }

    private void ApplyCursorTexture()
    {
        var camera = Camera.main;
        if (camera == null)
            return;

        Vector2 mousePosition = Mouse.current.position.ReadValue();
        Ray ray = camera.ScreenPointToRay(mousePosition);

        if (Physics.Raycast(ray, out RaycastHit hitInfo, Mathf.Infinity))
        {
            if (hitInfo.collider.TryGetComponent(out Building building))
            {
                Building.BuildingState buildingState = building.GetBuildingState();
                switch (buildingState)
                {
                    case Building.BuildingState.Unbuilt:
                        Cursor.SetCursor(buildCursor, Vector2.zero, CursorMode.Auto);
                        break;
                    case Building.BuildingState.Constructing:
                        Cursor.SetCursor(constructionCursor, Vector2.zero, CursorMode.Auto);
                        break;
                    case Building.BuildingState.Active:
                        Cursor.SetCursor(interactCursor, Vector2.zero, CursorMode.Auto);
                        break;
                    case Building.BuildingState.Destroyed:
                        Cursor.SetCursor(destroyCursor, Vector2.zero, CursorMode.Auto);
                        break;
                }
            }
            else
            {
                Cursor.SetCursor(defaultCursor, Vector2.zero, CursorMode.Auto);
            }

        }
    }

    // called when we press down the left mouse interact input
    public void OnInteractInput(InputAction.CallbackContext context)
    {
        if (!context.performed)
            return;

        var camera = Camera.main;
        if (camera == null)
            return;

        Vector2 mousePosition = Mouse.current.position.ReadValue();
        Ray ray = camera.ScreenPointToRay(mousePosition);

        if (Physics.Raycast(ray, out RaycastHit hitInfo, Mathf.Infinity))
        {
            if (hitInfo.collider.TryGetComponent(out Building building))
            {
                //building.Interact();
            }
        }
    }

    public void OnMoveInput(InputAction.CallbackContext context)
    {
        moveInput = context.ReadValue<Vector2>();
    }

    public void OnRotateInput(InputAction.CallbackContext context)
    {
        rotateInput = context.ReadValue<float>();
    }

    public void OnZoomInput(InputAction.CallbackContext context)
    {
        zoomInput = context.ReadValue<float>();
    }

    private void ApplyMovement()
    {
        if (moveInput == Vector2.zero)
            return;

        Vector3 moveDirection = new Vector3(moveInput.x, 0f, moveInput.y);
        transform.Translate(moveDirection * moveSpeed * Time.deltaTime, Space.World);
    }

    private void ApplyRotation()
    {
        if (Mathf.Approximately(rotateInput, 0f))
            return;

        transform.Rotate(Vector3.up, rotateInput * rotationSpeed * Time.deltaTime);
    }

    private void ApplyZoom()
    {
        if (Mathf.Approximately(zoomInput, 0f))
            return;

        float newY = Mathf.Clamp(transform.position.y + zoomInput * zoomSpeed * Time.deltaTime, minZoom, maxZoom);
        transform.position = new Vector3(transform.position.x, newY, transform.position.z);
    }
}