using System.Collections;
using Drawing;
using Reset.Core;
using Sirenix.OdinInspector;
using UnityEngine;
using Unity.Netcode;

namespace Reset.Units{
    public class Player : Unit, IKillable, IInteractable{
        // IKillable
        [ShowInInspector]
        public float maxHealth{ get; set; }
        public float currentHealth{ get; set; }

        // State management (don't like this being used like this)
        public NetworkVariable<bool> _isDowned;
        public bool IsDowned{
            get{
                if (UnitIsLocal()){
                    _isDowned.Value = FSM.currentRootStateName == "Downed";
                }
                return _isDowned.Value;
            }
        }

        // References
        public GameObject pickupTarget; // NOTE: Might be removed in a refactor (https://thunderstar.codecks.io/card/15v-refactor-interaction-handler)
        
        // (TEMP) Revive UI
        // NOTE: When I make the actual UI it's a good idea to have them somehow inherit from a class or something that
        // will make them persist for more than a frame since Rpc calls will make it flash
        public float persistDrawingRevive;
        public float lastKnownReviveTime;

        void Awake(){

        }

        void AttachToGame(){
            if (IsLocalPlayer || !UnitIsNetworked()) { // 
                PlayerManager.Player = gameObject;

                PlayerManager.RequestNewController();
                GetComponent<LockOnManager>().AttachCamera(gameObject);
            }
        }

        public override void UnitStart(){
            base.UnitStart();

            SetPlayerName();
            AttachToGame();
            
            ((IKillable)this).IKillableInitialize();
        }

        private void SetPlayerName(){
            name = "Player";
            if (UnitIsNetworked()){
                name += IsLocalPlayer ? ", Local" : ", Network";
            }
        }

        protected override void Update(){
            base.Update();

            // Draw Revive UI for at least .5 seconds to prevent flashing
            if (persistDrawingRevive > 0) {
                persistDrawingRevive -= 1f * Time.deltaTime;
                DrawReviveBarRpc(lastKnownReviveTime);
            }
        }

        public void TakeDamage(DamageSource[] sources){
            foreach (DamageSource source in sources) {
                TakeDamage(source);
            }
        }

        public void TakeDamage(DamageSource source){ 
            // Calculate health after damage, locally
            float newHealth = ((IKillable)this).currentHealth - source.damageDealt;

            // Tell every unit to set the new health value
            if (UnitIsNetworked()) {
                SetHealthRpc(newHealth);    
            } else {
                SetHealth(newHealth);
            }
        }

        [Rpc(SendTo.Everyone)]
        public void SetHealthRpc(float health){
            // Set health to new value, clamped to 0
            SetHealth(health);

            // For local players, run things based on health value. 
            // This Rpc is global but only the owner checks health
            CheckHealth();
        }

        private void SetHealth(float health){

            health = Mathf.Max(health, 0f);
            currentHealth = health;
        }

        void CheckHealth(){
            if (UnitIsLocal()){
                if (currentHealth <= 0f) {
                    Down();
                }
            }
        }

        void Down(){ 
            Graph.SendEvent("Downed");
        }

        public void Kill(){
            Graph.SendEvent("Killed");
        }

        public void Interact(){
            // Interaction for picking up allies
            // Check if the other player can be interacted with at all 
            if (pickupTarget&& pickupTarget.GetComponent<Player>().CanInteract()) {
                // Tell the local player to start picking up the ally and switch states
                Graph.SendEvent("Picking Up Ally");
                
                // Tell the target player to start getting picked up.
                pickupTarget.GetComponent<Player>().StartPickupRpc();
                
                // Wait for the pickup timer to finish
                StartCoroutine(PickupTimer());
            }
        }

        [Rpc(SendTo.Owner)]
        public void StartPickupRpc(){
            // When picked up by another player, move into the pick up state
            Graph.SendEvent("Pick Up Start");
        }

        IEnumerator PickupTimer(){
            // Start a timer and wait for it to complete
            float elapsed = 0f;

            while (elapsed < 7f) {
                elapsed += 1f * Time.deltaTime;
                
                yield return null;
            }
            
            Graph.SendEvent("Pick Up Success");
        }

        public bool CanInteract(){
            return IsDowned;
        }

        public void CancelInteract(){
            Graph.SendEvent("Pick Up Failed");
        }

        public void OnObserverDetected(EnvironmentObserver observer){
            // Try and get a Player component from the current hit object
            // The rest of the logic will continue as expected so long as an
            pickupTarget = observer.hit.collider.gameObject;
            DrawInteractStatus();
        }
        
        void DrawInteractStatus(){
            using (Draw.WithColor(Color.blue)) {
                Draw.ingame.Label2D(transform.position + Vector3.up * 2.5f, "Interactable",
                    Color.orchid);
            }
        }
        
        [Rpc(SendTo.Everyone)]
        public void DrawReviveBarRpc(float elapsedTime){
            // Draw a (shoddy) UI bar that shows the revie progress
            using (Draw.ingame.WithLineWidth(5f)) {
                using (Draw.InLocalSpace(transform)){
                    // Set width of the bar
                    float width = .9f;
                    float widthDone = width * elapsedTime / 5f; // 5f assumes a 5 second revive time

                    // Clamp the red bar showing how much is progresseed to the max of width of the purple bar background (to prevent it going outside)
                    widthDone = Mathf.Clamp(widthDone, 0, width);
					    
                    // Draw background bar
                    Vector3 pos = Vector3.up * 1.8f + Vector3.left * width + Vector3.forward * +.01f;
                    Draw.ingame.Line(
                        transform.position + Camera.main.transform.rotation * pos, 
                        transform.position + Camera.main.transform.rotation * (pos + Vector3.right * width * 2f), 
                        Color.rebeccaPurple
                    );
					    
                    // Draw foreground bar
                    Vector3 donePos = Vector3.up * 1.8f + Vector3.left * widthDone;
                    Draw.ingame.Line(
                        transform.position + Camera.main.transform.rotation * donePos, 
                        transform.position + Camera.main.transform.rotation * (donePos + Vector3.right * widthDone * 2f), 
                        Color.red
                    );
                }
            }
            
            // Set last known time so that online players don't have flashing UIs
            lastKnownReviveTime = elapsedTime;
        }

        void LateUpdate(){
            // Clear the pickupTarget every frame 
            // NOTE: Will this work online?
            pickupTarget = null;
        }
    }
}