using UnityEngine;

namespace Code.Lab5
{
    public class ProjectileLauncher : MonoBehaviour
    {
        public GameObject projectilePrefab;
        public Transform target;
        public float launchSpeed = 20f;
        public bool useHighTrajectory;
        
        public float randomRadius = 10f;
        public Vector2 centerOffset = Vector2.zero;
        public GameObject targetCirclePrefab;
        public bool showTargetCircle = true;
        public float circleLifetime = 2f;

        private void Start()
        {
            if (target == null)
            {
                CreateNewRandomTarget();
            }
        }

        private void Update()
        {
            if (Input.GetKeyDown(KeyCode.Space))
            {
                LaunchProjectile();
            }
            
            if (Input.GetKeyDown(KeyCode.R))
            {
                CreateNewRandomTarget();
            }
        }

        private void CreateNewRandomTarget()
        {
            var center = new Vector3(
                transform.position.x + centerOffset.x,
                0.1f,
                transform.position.z + centerOffset.y
            );
            
            var randomCircle = Random.insideUnitCircle * randomRadius;
            
            var randomPosition = new Vector3(
                center.x + randomCircle.x,
                0.1f,
                center.z + randomCircle.y
            );
            
            if (target)
            {
                target.position = randomPosition;
            }
            else
            {
                var newTarget = new GameObject("RandomTarget")
                {
                    transform =
                    {
                        position = randomPosition
                    }
                };
                target = newTarget.transform;
            }
            
            if (showTargetCircle && targetCirclePrefab)
            {
                SpawnTargetCircle(randomPosition);
            }
        }

        private void SpawnTargetCircle(Vector3 position)
        {
            var circle = Instantiate(targetCirclePrefab, position, Quaternion.identity);
            var circlePos = circle.transform.position;
            circlePos.y = 0.05f;
            circle.transform.position = circlePos;
            
            if (circleLifetime > 0)
            {
                Destroy(circle, circleLifetime);
            }
        }

        private void LaunchProjectile()
        {
            if (!target) return;

            var direction = Projectile.GetFireDirection(
                transform.position, 
                target.position, 
                launchSpeed, 
                useHighTrajectory
            );

            if (direction == Vector3.zero) return;
            
            var projObj = Instantiate(projectilePrefab, transform.position, Quaternion.identity);
            var projectile = projObj.GetComponent<Projectile>();
            projectile.Set(transform.position, direction, launchSpeed);
                
            CreateNewRandomTarget();
        }

        public void SetTargetAtPosition(Vector3 position)
        {
            var targetPos = position;
            targetPos.y = 0.1f;
            
            if (target != null)
            {
                target.position = targetPos;
            }
            else
            {
                var newTarget = new GameObject("ManualTarget")
                {
                    transform =
                    {
                        position = targetPos
                    }
                };
                target = newTarget.transform;
            }
            
            if (showTargetCircle && targetCirclePrefab != null)
            {
                SpawnTargetCircle(targetPos);
            }
        }

        private void OnDrawGizmosSelected()
        {
            Gizmos.color = new Color(1f, 0f, 0f, 0.2f);
            var center = new Vector3(
                transform.position.x + centerOffset.x,
                0.1f,
                transform.position.z + centerOffset.y
            );
            Gizmos.DrawWireSphere(center, randomRadius);
            
            if (target != null)
            {
                var reachable = Projectile.IsTargetReachable(transform.position, target.position, launchSpeed);
                Gizmos.color = reachable ? Color.green : Color.red;
                Gizmos.DrawLine(transform.position, target.position);
                
                Gizmos.color = Color.yellow;
                Gizmos.DrawSphere(target.position, 0.2f);
            }
        }
    }
}