using Barotrauma.Items.Components;
using FarseerPhysics;
using Microsoft.Xna.Framework;
using System;
using System.Linq;
using Barotrauma.Extensions;

namespace Barotrauma
{
    class AIObjectiveExtinguishFire : AIObjective
    {
        public override string DebugTag => "extinguish fire";
        public override bool ForceRun => true;
        public override bool ConcurrentObjectives => true;

        private readonly Hull targetHull;

        private AIObjectiveGetItem getExtinguisherObjective;
        private AIObjectiveGoTo gotoObjective;
        private float useExtinquisherTimer;

        public AIObjectiveExtinguishFire(Character character, Hull targetHull, AIObjectiveManager objectiveManager, float priorityModifier = 1) 
            : base(character, objectiveManager, priorityModifier)
        {
            this.targetHull = targetHull;
        }

        public override float GetPriority()
        {
            if (Character.CharacterList.Any(c => c.CurrentHull == targetHull && !HumanAIController.IsFriendly(c))) { return 0; }
            // Vertical distance matters more than horizontal (climbing up/down is harder than moving horizontally)
            float dist = Math.Abs(character.WorldPosition.X - targetHull.WorldPosition.X) + Math.Abs(character.WorldPosition.Y - targetHull.WorldPosition.Y) * 2.0f;
            float distanceFactor = MathHelper.Lerp(1, 0.1f, MathUtils.InverseLerp(0, 10000, dist));
            float severity = AIObjectiveExtinguishFires.GetFireSeverity(targetHull);
            float severityFactor = MathHelper.Lerp(0, 1, severity / 100);
            float devotion = Math.Min(Priority, 10) / 100;
            return MathHelper.Lerp(0, 100, MathHelper.Clamp(devotion + severityFactor * distanceFactor, 0, 1));
        }

        public override bool IsCompleted() => targetHull.FireSources.None();

        public override bool IsDuplicate(AIObjective otherObjective) => otherObjective is AIObjectiveExtinguishFire otherExtinguishFire && otherExtinguishFire.targetHull == targetHull;

        protected override void Act(float deltaTime)
        {
            var extinguisherItem = character.Inventory.FindItemByIdentifier("extinguisher") ?? character.Inventory.FindItemByTag("extinguisher");
            if (extinguisherItem == null || extinguisherItem.Condition <= 0.0f || !character.HasEquippedItem(extinguisherItem))
            {
                TryAddSubObjective(ref getExtinguisherObjective, () =>
                {
                    character.Speak(TextManager.Get("DialogFindExtinguisher"), null, 2.0f, "findextinguisher", 30.0f);
                    return new AIObjectiveGetItem(character, "extinguisher", objectiveManager, equip: true);
                });
            }
            else
            {
                var extinguisher = extinguisherItem.GetComponent<RepairTool>();
                if (extinguisher == null)
                {
#if DEBUG
                    DebugConsole.ThrowError("AIObjectiveExtinguishFire failed - the item \"" + extinguisherItem + "\" has no RepairTool component but is tagged as an extinguisher");
#endif
                    abandon = true;
                    return;
                }
                foreach (FireSource fs in targetHull.FireSources)
                {
                    bool inRange = fs.IsInDamageRange(character, MathHelper.Clamp(fs.DamageRange * 1.5f, extinguisher.Range * 0.5f, extinguisher.Range));
                    bool move = !inRange;
                    if (inRange || useExtinquisherTimer > 0.0f)
                    {
                        useExtinquisherTimer += deltaTime;
                        if (useExtinquisherTimer > 2.0f)
                        {
                            useExtinquisherTimer = 0.0f;
                        }
                        character.AIController.SteeringManager.Reset();
                        character.CursorPosition = fs.Position;
                        if (extinguisher.Item.RequireAimToUse)
                        {
                            bool isOperatingButtons = false;
                            if (SteeringManager == PathSteering)
                            {
                                var door = PathSteering.CurrentPath?.CurrentNode?.ConnectedDoor;
                                if (door != null && !door.IsOpen)
                                {
                                    isOperatingButtons = door.HasIntegratedButtons || door.Item.GetConnectedComponents<Controller>(true).Any();
                                }
                            }
                            if (!isOperatingButtons)
                            {
                                character.SetInput(InputType.Aim, false, true);
                            }
                        }
                        Limb sightLimb = null;
                        if (character.Inventory.IsInLimbSlot(extinguisherItem, InvSlotType.RightHand))
                        {
                            sightLimb = character.AnimController.GetLimb(LimbType.RightHand);
                        }
                        else if (character.Inventory.IsInLimbSlot(extinguisherItem, InvSlotType.LeftHand))
                        {
                            sightLimb = character.AnimController.GetLimb(LimbType.LeftHand);
                        }
                        if (!character.CanSeeTarget(fs, sightLimb))
                        {
                            move = true;
                        }
                        else
                        {
                            move = false;
                            extinguisher.Use(deltaTime, character);
                            if (!targetHull.FireSources.Contains(fs))
                            {                                
                                character.Speak(TextManager.GetWithVariable("DialogPutOutFire", "[roomname]", targetHull.Name, true), null, 0, "putoutfire", 10.0f);
                            }
                        }
                    }
                    if (move)
                    {
                        //go to the first firesource
                        TryAddSubObjective(ref gotoObjective, () => new AIObjectiveGoTo(fs, character, objectiveManager));
                    }
                    break;
                }
            }
        }
    }
}