using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using System.Xml.Serialization;
using UnityEngine;

namespace RimWorldAnimationStudio
{
    public class AnimationStage
    {
        // Data to/from animationDef
        public string stageName;
        public int? playTimeTicks;
        public int? playTimeTicksQuick;
        public bool? isLooping;
        [XmlArray("animationClips"), XmlArrayItem("li")] public List<PawnAnimationClip> animationClips;

        // Data serialization control
        public bool ShouldSerializeanimationClips() { return animationClips.NotNullOrEmpty(); }

        // Data helper functions
        [XmlIgnore] public string StageName
        {
            get { return string.IsNullOrEmpty(stageName) ? stageName = "NewStage" : stageName; }
            set { stageName = value; }
        }

        [XmlIgnore] public int PlayTimeTicks
        {
            get { return playTimeTicks.HasValue ? playTimeTicks.Value : 0; }
            set { playTimeTicks = value; }
        }

        [XmlIgnore] public int PlayTimeTicksQuick
        {
            get { return playTimeTicksQuick.HasValue ? playTimeTicksQuick.Value : 0; }
            set { playTimeTicksQuick = value; }
        }

        [XmlIgnore] public bool IsLooping
        {
            get { return isLooping == true; }
            set { isLooping = value; }
        }

        [XmlIgnore] public List<PawnAnimationClip> AnimationClips
        {
            get { return animationClips.NullOrEmpty() ? animationClips = new List<PawnAnimationClip>() : animationClips; }
            set { animationClips = value.NotNullOrEmpty() ? value : null; }
        }

        [XmlIgnore] public int StageLoopsNormal
        {
            get { return Mathf.CeilToInt(PlayTimeTicks / Workspace.StageWindowSize); }
            set { value = Math.Max(1, value); PlayTimeTicks = value * Workspace.StageWindowSize; IsLooping = value > 1; }
        }

        [XmlIgnore] public int StageLoopsQuick
        {
            get { return Mathf.CeilToInt(PlayTimeTicksQuick / Workspace.StageWindowSize); }
            set { value = Math.Max(0, Math.Min(value, StageLoopsNormal)); PlayTimeTicksQuick = value * Workspace.StageWindowSize; }
        }

        // Local data
        [XmlIgnore] public int stageWindowSize = -1;

        // Methods
        public void Initialize()
        {
            foreach (PawnAnimationClip clip in AnimationClips)
            {
                clip.BuildSimpleCurves();

                if (clip.duration > PlayTimeTicks)
                { PlayTimeTicks = clip.duration; }
            }
        }

        public int GetStageID()
        {
            if (Workspace.animationDef == null) return -1;

            return Workspace.animationDef.AnimationStages.IndexOf(this);
        }

        public void StretchStageWindow(int newStageWindowSize)
        {
            ResizeStageWindow(newStageWindowSize);

            float scale = (float)newStageWindowSize / Workspace.StageWindowSize;

            foreach (PawnAnimationClip clip in AnimationClips)
            {
                foreach (PawnKeyframe keyframe in clip.Keyframes)
                {
                    keyframe.atTick = keyframe.atTick == Constants.minTick ? Constants.minTick : Mathf.CeilToInt((float)keyframe.atTick.Value * scale);
                    keyframe.TickDuration = 0;
                }

                clip.BuildSimpleCurves();
            }

            EventsManager.OnStageWindowSizeChanged(this);
        }

        public void ResizeStageWindow(int newStageWindowSize)
        {       
            Workspace.GetCurrentAnimationStage().PlayTimeTicks = newStageWindowSize * StageLoopsNormal;
            Workspace.GetCurrentAnimationStage().PlayTimeTicksQuick = newStageWindowSize * StageLoopsQuick;
            Workspace.GetCurrentAnimationStage().stageWindowSize = newStageWindowSize;

            EventsManager.OnStageWindowSizeChanged(this);
        }

        public void AddAnimationClip(int actorID = -1)
        {
            PawnAnimationClip clip = new PawnAnimationClip();
            PawnKeyframe lastkeyframe = null;

            if (actorID >= 0)
            { lastkeyframe = Workspace.GetPawnAnimationClip(actorID)?.Keyframes?.Last(); }

            if (lastkeyframe != null)
            {
                PawnKeyframe keyframeA = lastkeyframe.GetClone();
                keyframeA.GenerateKeyframeID(actorID);
                keyframeA.atTick = null;
                keyframeA.TickDuration = Constants.defaultAnimationClipLength - 1;

                clip.Keyframes.Add(keyframeA);

                PawnKeyframe keyframeB = lastkeyframe.GetClone();
                keyframeB.GenerateKeyframeID(actorID);
                keyframeB.atTick = null;
                keyframeB.TickDuration = 1;

                clip.Keyframes.Add(keyframeB);
            }

            else
            {
                PawnKeyframe keyframeA = new PawnKeyframe();
                keyframeA.TickDuration = Constants.defaultAnimationClipLength - 1;

                clip.Keyframes.Add(keyframeA);

                PawnKeyframe keyframeB = new PawnKeyframe();

                clip.Keyframes.Add(keyframeB);
            }

            animationClips.Add(clip);
        }

        public AnimationStage GetClone()
        {
            AnimationStage clone = this.Copy();

            foreach (PawnAnimationClip clip in clone.animationClips)
            {
                foreach (PawnKeyframe keyframe in clip.Keyframes)
                { keyframe.GenerateKeyframeID(keyframe.actorID); }
            }

            return clone;
        }

        // Pre-save / post-load
        public void OnPreSave()
        {
            foreach (PawnAnimationClip clip in AnimationClips)
            { clip.Keyframes = clip.Keyframes.OrderBy(x => x.atTick).ToList(); }
        }

        public void OnPostLoad()
        {

        }
    }
}