#nullable enable
using Microsoft.Xna.Framework;
using System.Collections.Generic;
using System.Collections.Immutable;

namespace Barotrauma
{
    public enum FactionAffiliation
    {
        Positive,
        Neutral,
        Negative
    }

    class Faction
    {
        public Reputation Reputation { get; }
        public FactionPrefab Prefab { get; }

        public Faction(CampaignMetadata? metadata, FactionPrefab prefab)
        {
            Prefab = prefab;
            Reputation = new Reputation(metadata, this, prefab.MinReputation, prefab.MaxReputation, prefab.InitialReputation);
        }

        /// <summary>
        /// Get what kind of affiliation this faction has towards the player depending on who they chose to side with via talents
        /// </summary>
        /// <returns></returns>
        public static FactionAffiliation GetPlayerAffiliationStatus(Faction faction)
        {
            if (GameMain.GameSession?.Campaign?.Factions is not { } factions) { return FactionAffiliation.Neutral; }

            bool isHighest = true;
            foreach (Faction otherFaction in factions)
            {
                if (otherFaction == faction || otherFaction.Reputation.Value < faction.Reputation.Value) { continue; }

                isHighest = false;
                break;
            }

            return isHighest ? FactionAffiliation.Positive : FactionAffiliation.Negative;
        }

        public override string ToString()
        {
            return $"{base.ToString()} ({Prefab?.Identifier.ToString() ?? "null"})";
        }
    }

    internal class FactionPrefab : Prefab
    {
        public readonly static PrefabCollection<FactionPrefab> Prefabs = new PrefabCollection<FactionPrefab>();

        public LocalizedString Name { get; }

        public LocalizedString Description { get; }
        public LocalizedString ShortDescription { get; }

        public Identifier OpposingFaction { get; }

        public class HireableCharacter
        {
            public readonly Identifier NPCSetIdentifier;
            public readonly Identifier NPCIdentifier;
            public readonly float MinReputation;

            public HireableCharacter(ContentXElement element)
            {
                NPCSetIdentifier = element.GetAttributeIdentifier("from", element.GetAttributeIdentifier("npcsetidentifier", Identifier.Empty));
                NPCIdentifier = element.GetAttributeIdentifier("identifier", element.GetAttributeIdentifier("npcidentifier", Identifier.Empty));
                MinReputation = element.GetAttributeFloat("minreputation", 0.0f);
            }
        }

        public ImmutableArray<HireableCharacter> HireableCharacters;

        public class AutomaticMission
        {
            public readonly Identifier MissionTag;
            public readonly LevelData.LevelType LevelType;
            public readonly float MinReputation, MaxReputation;
            public readonly float MinProbability, MaxProbability;
            public readonly int MaxDistanceFromFactionOutpost;
            public readonly bool DisallowBetweenOtherFactionOutposts;

            public AutomaticMission(ContentXElement element, string parentDebugName)
            {
                MissionTag = element.GetAttributeIdentifier("missiontag", Identifier.Empty);
                LevelType = element.GetAttributeEnum("leveltype", LevelData.LevelType.LocationConnection);
                MinReputation = element.GetAttributeFloat("minreputation", 0.0f);
                MaxReputation = element.GetAttributeFloat("maxreputation", 0.0f);
                if (MinReputation > MaxReputation)
                {
                    DebugConsole.ThrowError($"Error in faction prefab \"{parentDebugName}\": MinReputation cannot be larger than MaxReputation.");
                }
                float probability = element.GetAttributeFloat("probability", 0.0f);
                MinProbability = element.GetAttributeFloat("minprobability", probability);
                MaxProbability = element.GetAttributeFloat("maxprobability", probability);
                MaxDistanceFromFactionOutpost = element.GetAttributeInt(nameof(MaxDistanceFromFactionOutpost), int.MaxValue);
                DisallowBetweenOtherFactionOutposts = element.GetAttributeBool(nameof(DisallowBetweenOtherFactionOutposts), false);
            }
        }

        public ImmutableArray<AutomaticMission> AutomaticMissions;

        public bool StartOutpost { get; }


        public int MenuOrder { get; }

        /// <summary>
        /// How low the reputation can drop on this faction
        /// </summary>
        public int MinReputation { get; }

        /// <summary>
        /// Maximum reputation level you can gain on this faction
        /// </summary>
        public int MaxReputation { get; }

        /// <summary>
        /// What reputation does this faction start with
        /// </summary>
        public int InitialReputation { get; }

        public float ControlledOutpostPercentage { get; }

        public float SecondaryControlledOutpostPercentage { get; }

#if CLIENT
        public Sprite? Icon { get; private set; }

        public Sprite? IconSmall { get; private set; }

        public Sprite? BackgroundPortrait { get; private set; }
#endif

        public Color IconColor { get; }

        public FactionPrefab(ContentXElement element, FactionsFile file) : base(file, element.GetAttributeIdentifier("identifier", string.Empty))
        {
            MenuOrder = element.GetAttributeInt("menuorder", 0);
            StartOutpost = element.GetAttributeBool("startoutpost", false);
            MinReputation = element.GetAttributeInt("minreputation", -100);
            MaxReputation = element.GetAttributeInt("maxreputation", 100);
            InitialReputation = element.GetAttributeInt("initialreputation", 0);
            ControlledOutpostPercentage = element.GetAttributeFloat("controlledoutpostpercentage", 0);
            SecondaryControlledOutpostPercentage = element.GetAttributeFloat("secondarycontrolledoutpostpercentage", 0);
            Name = element.GetAttributeString("name", null) ?? TextManager.Get($"faction.{Identifier}").Fallback("Unnamed");
            Description = element.GetAttributeString("description", null) ?? TextManager.Get($"faction.{Identifier}.description").Fallback("");
            ShortDescription = element.GetAttributeString("shortdescription", null) ?? TextManager.Get($"faction.{Identifier}.shortdescription").Fallback("");
            OpposingFaction = element.GetAttributeIdentifier(nameof(OpposingFaction), Identifier.Empty);

            List<HireableCharacter> hireableCharacters = new List<HireableCharacter>();
            List<AutomaticMission> automaticMissions = new List<AutomaticMission>();
            foreach (var subElement in element.Elements())
            {
                var subElementId = subElement.NameAsIdentifier();
                if (subElementId == "icon")
                {
                    IconColor = subElement.GetAttributeColor("color", Color.White);
#if CLIENT
                    Icon = new Sprite(subElement);
#endif
                }
                else if (subElementId == "iconsmall")
                {
#if CLIENT
                    IconSmall = new Sprite(subElement);
#endif
                }
                else if (subElementId == "portrait")
                {
#if CLIENT
                    BackgroundPortrait = new Sprite(subElement);
#endif
                }
                else if (subElementId == "hireable")
                {
                    hireableCharacters.Add(new HireableCharacter(subElement));
                }
                else if (subElementId == "mission" || subElementId == "automaticmission")
                {
                    automaticMissions.Add(new AutomaticMission(subElement, Identifier.ToString()));
                }
            }
            HireableCharacters = hireableCharacters.ToImmutableArray();
            AutomaticMissions = automaticMissions.ToImmutableArray();
        }

        public override string ToString()
        {
            return $"{base.ToString()} ({Identifier})";
        }

        public override void Dispose()
        {
#if CLIENT
            Icon?.Remove();
            Icon = null;
#endif
        }
    }
}