using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Verse;
using RimWorld;

namespace RJW_BGS
{
    public class InheritanceUtility
    {
        public static List<GeneDef> AnimalInheritedGenes(Pawn father, Pawn mother)
        {
            List<GeneDef> genelist = new List<GeneDef>();
            //If Both are Humans, or Both are animals, do nothing & return empty GeneList 
            if (!mother.RaceProps.Humanlike && !father.RaceProps.Humanlike)
                return genelist;
            if (mother.RaceProps.Humanlike && father.RaceProps.Humanlike)
                return genelist;


            //One parent must be an animal and the other must be human, so only one needs to return
            if (father != null && !father.RaceProps.Humanlike)
            {
                return SelectGenes(father);
            }
            if (mother != null && !mother.RaceProps.Humanlike)
            {
                return SelectGenes(mother);
            }

            return genelist;
        }

        /// <summary>
        /// Looks up potential genes for an animal, 
        /// checks their chance and returns all 'triggered' genes.
        /// </summary>
        /// <param name="pawn">The animal for which to look up genes (Animals are Pawns in RW)</param>
        /// <returns>The genes that will be inherited from this animal.</returns>
        public static List<GeneDef> SelectGenes(Pawn pawn)
        {
            List<GeneDef> genelist = new List<GeneDef>();
            RaceGeneDef raceGeneDef = RJWcopy.GetRaceGeneDefInternal(pawn);
            if (raceGeneDef != null)
            {
                foreach (BestialityGeneInheritanceDef gene in raceGeneDef.genes)
                {
                    if (gene.chance >= Rand.Range(0.01f,1f))
                    {
                        genelist.Add(DefDatabase<GeneDef>.GetNamed(gene.defName));
                    }
                }
            }
            return genelist;
        }

        public static void AddGenes(Pawn pawn, List<GeneDef> genes)
        {
            foreach (GeneDef gene in genes)
            {
                pawn.genes.AddGene(gene, false);
            }
        }

        public static void NewGenes(Pawn mother, Pawn dad, Pawn baby)
        {
            if (baby.RaceProps.Humanlike)
            {
                if (baby.genes == null)
                {
                    baby.genes = new Pawn_GeneTracker(baby);
                }

                //Remove the hair and skin genes pawns always start with, should get correct ones from human parent anyway.
                for (int i = baby.genes.Endogenes.Count - 1; i >= 0; i--)
                {
                    baby.genes.RemoveGene(baby.genes.Endogenes[i]);
                }

                List<GeneDef> genes = PregnancyUtility.GetInheritedGenes(dad, mother);
                List<GeneDef> beastgenes = InheritanceUtility.AnimalInheritedGenes(dad, mother);
                InheritanceUtility.AddGenes(baby, beastgenes);
                InheritanceUtility.AddGenes(baby, genes);
                if(baby.genes.GetFirstEndogeneByCategory(EndogeneCategory.Melanin) == null)
                {
                    AddSkinColor(mother, dad, baby);
                }
            }
        }

        public static void AddSkinColor(Pawn mother, Pawn father, Pawn baby)
        {
            if (mother != null && mother.genes != null)
            {
                GeneDef gene = mother.genes.GetFirstEndogeneByCategory(EndogeneCategory.Melanin);
                if (gene != null)
                {
                    baby.genes.AddGene(gene, false);
                }
            }
            else if (father != null && father.genes != null)
            {
                GeneDef gene = father.genes.GetFirstEndogeneByCategory(EndogeneCategory.Melanin);
                if (gene != null)
                {
                    baby.genes.AddGene(gene, false);
                }
            }
            else
            {
                Log.Message("Could not find skincolor of " + baby.Name + "'s parents, giving random skincolor.");
                baby.genes.AddGene(PawnSkinColors.RandomSkinColorGene(baby), false);
            }
        }

    }
}