using UnityEngine;
using Ashwild.Harvesting;
using Ashwild.Inventory;
using Ashwild.Network;

namespace Ashwild.Player
{
    /// <summary>
    /// Held-item logic for tools, placed on the tool's hand prefab (axe, pickaxe, ...).
    /// While the prefab is equipped it listens to the use input and harvests whatever
    /// the player aims at, scaled by the tool's own ItemData (ToolPower, HarvestType).
    /// No animation here — the FPS arm model plays its own; this is pure logic.
    /// </summary>
    [DisallowMultipleComponent]
    public class ToolBehaviour : MonoBehaviour, IHeldItemBehaviour
    {
        #region Serialized Fields

        [Header("Harvesting")]
        /// <summary>
        /// Maximum distance, in metres, at which a harvestable can be hit.
        /// </summary>
        [SerializeField] private float harvestRange = 3f;

        /// <summary>
        /// Layers the harvest ray is allowed to hit.
        /// </summary>
        [SerializeField] private LayerMask harvestMask = ~0;

        [Header("Damage")]
        /// <summary>
        /// Base damage before the tool's ToolPower multiplier is applied.
        /// </summary>
        [SerializeField] private float baseDamage = 10f;

        /// <summary>
        /// Damage multiplier when the tool does not match the target type (0 = strict).
        /// </summary>
        [SerializeField, Range(0f, 1f)] private float wrongToolMultiplier = 0.25f;

        [Header("Cooldown")]
        /// <summary>
        /// Minimum time, in seconds, between two swings.
        /// </summary>
        [SerializeField] private float swingCooldown = 0.5f;

        #endregion

        #region State

        /// <summary>
        /// Aim ray injected by the player when this item is drawn.
        /// </summary>
        private Transform raycastOrigin;

        /// <summary>
        /// The ItemData this held prefab represents, used for damage scaling.
        /// </summary>
        private ItemData item;

        /// <summary>
        /// Earliest time, in seconds, the next swing is allowed.
        /// </summary>
        private float nextSwingTime;

        #endregion

        #region Unity Lifecycle

        /// <summary>
        /// Subscribes to the use input for as long as this item is held.
        /// </summary>
        private void OnEnable()
        {
            PlayerEvents.AttackPressed += HandleAttackPressed;
        }

        /// <summary>
        /// Unsubscribes when the item is put away (the prefab is destroyed).
        /// </summary>
        private void OnDisable()
        {
            PlayerEvents.AttackPressed -= HandleAttackPressed;
        }

        #endregion

        #region IHeldItemBehaviour

        /// <summary>
        /// Links this tool to the player: stores the aim ray and the tool's ItemData.
        /// </summary>
        public void Setup(HeldItemContext context, ItemData item)
        {
            raycastOrigin = context != null ? context.RaycastOrigin : null;
            this.item = item;
        }

        #endregion

        #region Event Handlers

        /// <summary>
        /// Swings on use input (gated by lock, setup and cooldown) and harvests the
        /// aimed target.
        /// </summary>
        private void HandleAttackPressed()
        {
            if (PlayerEvents.InputLocked) return;
            if (raycastOrigin == null) return;
            if (Time.time < nextSwingTime) return;

            nextSwingTime = Time.time + swingCooldown;

            PlayerEvents.RaiseAttackSwung();
            TryHarvest();
        }

        #endregion

        #region Harvesting

        /// <summary>
        /// Raycasts forward and applies a hit to the harvestable found, or a blocked
        /// "clunk" when this tool deals no damage to that target type.
        /// </summary>
        private void TryHarvest()
        {
            if (!Physics.Raycast(raycastOrigin.position, raycastOrigin.forward, out RaycastHit hit, harvestRange, harvestMask))
                return;

            Harvestable harvestable = hit.collider.GetComponentInParent<Harvestable>();
            if (harvestable == null) return;

            Vector3 hitDirection = raycastOrigin.forward;
            float damage = CalculateDamage(harvestable.HarvestType);

            // No proper tool match: the hit is blocked — no resources, no damage,
            // just a small "clunk" so it reads as "you need a tool for this".
            if (damage <= 0f)
            {
                harvestable.PlayBlockedFeedback(hitDirection);
                return;
            }

            if (HarvestableRegistry.Instance == null)
            {
                Debug.LogError("[ToolBehaviour] No HarvestableRegistry in the scene — cannot harvest.", this);
                return;
            }

            // Already depleted (e.g. someone else just felled it): ignore.
            if (HarvestableRegistry.Instance.IsInactive(harvestable.Id)) return;

            // Play the hit feedback locally for instant response; the server replays it to others.
            harvestable.PlayHitEffect(hitDirection);

            // Server applies the damage authoritatively, grants loot, and handles depletion/respawn.
            ushort toolId = ItemDatabase.Instance != null ? ItemDatabase.Instance.GetId(item) : (ushort)0;
            HarvestableRegistry.Instance.RequestHitServerRpc(harvestable.Id, damage, toolId, hitDirection);

            PlayerEvents.RaiseHarvestableHit(harvestable, damage);
        }

        /// <summary>
        /// Damage against a target type: full when the tool matches, reduced (or zero)
        /// otherwise. Zero when this prefab has no ItemData.
        /// </summary>
        private float CalculateDamage(HarvestType targetType)
        {
            if (item == null) return 0f;

            if (item.HarvestType == targetType) return baseDamage * item.ToolPower;

            // Wrong tool type: reduced damage. Set wrongToolMultiplier to 0 for a strict "right tool only" rule.
            return baseDamage * item.ToolPower * wrongToolMultiplier;
        }

        #endregion
    }
}