using System.Collections.Generic;
using UnityEngine;

namespace AibisDream.FrameAnimation
{
    [CreateAssetMenu(fileName = "FrameAnimationGraph", menuName = "AibisDream/Frame Animation/Frame Animation Graph")]
    public sealed class FrameAnimationGraph : ScriptableObject
    {
        [SerializeField] private string id = string.Empty;
        [SerializeField] private string displayName = string.Empty;
        [SerializeField] private List<FrameClip> clips = new List<FrameClip>();
        [SerializeField] private List<AnimationNode> nodes = new List<AnimationNode>();
        [SerializeField] private List<AnimationEdge> edges = new List<AnimationEdge>();
        [SerializeField] private List<AnimationFlow> flows = new List<AnimationFlow>();
        [SerializeField] private List<FrameAnimationImportSource> importSources =
            new List<FrameAnimationImportSource>();
        [SerializeField] private FrameAnimationGraphSettings settings = new FrameAnimationGraphSettings();
        [SerializeField] private FrameAnimationGraphEditorData editorData = new FrameAnimationGraphEditorData();

        public string Id => id;
        public string DisplayName => displayName;
        public IReadOnlyList<FrameClip> Clips => clips;
        public IReadOnlyList<AnimationNode> Nodes => nodes;
        public IReadOnlyList<AnimationEdge> Edges => edges;
        public IReadOnlyList<AnimationFlow> Flows => flows;
        public IReadOnlyList<FrameAnimationImportSource> ImportSources => importSources;
        public FrameAnimationGraphSettings Settings => settings;
        public FrameAnimationGraphEditorData EditorData => editorData;

        private void OnEnable()
        {
            EnsureCollections();
        }

#if UNITY_EDITOR
        private void OnValidate()
        {
            EnsureCollections();
            EnsureMissingInternalIds();
        }
#endif

        internal void Configure(
            string graphId,
            string graphDisplayName,
            IEnumerable<FrameClip> graphClips,
            IEnumerable<AnimationNode> graphNodes,
            IEnumerable<AnimationEdge> graphEdges,
            IEnumerable<AnimationFlow> graphFlows,
            string defaultPlayableId)
        {
            id = graphId ?? string.Empty;
            displayName = graphDisplayName ?? id;
            clips = graphClips != null ? new List<FrameClip>(graphClips) : new List<FrameClip>();
            nodes = graphNodes != null ? new List<AnimationNode>(graphNodes) : new List<AnimationNode>();
            edges = graphEdges != null ? new List<AnimationEdge>(graphEdges) : new List<AnimationEdge>();
            flows = graphFlows != null ? new List<AnimationFlow>(graphFlows) : new List<AnimationFlow>();
            importSources ??= new List<FrameAnimationImportSource>();
            settings ??= new FrameAnimationGraphSettings();
            settings.SetDefaultPlayableId(defaultPlayableId);
            editorData ??= new FrameAnimationGraphEditorData();
            EnsureMissingInternalIds();
        }

        internal void EnsureMissingInternalIds()
        {
            if (nodes != null)
            {
                foreach (var node in nodes)
                {
                    node?.EnsureInternalId();
                }
            }

            if (edges != null)
            {
                foreach (var edge in edges)
                {
                    edge?.EnsureInternalId();
                }
            }

            if (importSources != null)
            {
                foreach (var source in importSources)
                {
                    source?.EnsureInternalId();
                }
            }
        }

        internal void AddImportedClip(FrameClip clip)
        {
            EnsureCollections();
            if (clip != null && !clips.Contains(clip))
            {
                clips.Add(clip);
            }
        }

        internal void AddClip(FrameClip clip)
        {
            AddImportedClip(clip);
        }

        internal bool RemoveClip(FrameClip clip)
        {
            EnsureCollections();
            return clip != null && clips.Remove(clip);
        }

        internal void AddFlow(AnimationFlow flow)
        {
            EnsureCollections();
            if (flow != null && !flows.Contains(flow))
            {
                flows.Add(flow);
            }
        }

        internal bool RemoveFlow(AnimationFlow flow)
        {
            EnsureCollections();
            return flow != null && flows.Remove(flow);
        }

        internal void AddNode(AnimationNode node)
        {
            EnsureCollections();
            if (node != null && !nodes.Contains(node))
            {
                node.EnsureInternalId();
                nodes.Add(node);
            }
        }

        internal bool RemoveNode(AnimationNode node)
        {
            EnsureCollections();
            return node != null && nodes.Remove(node);
        }

        internal void AddEdge(AnimationEdge edge)
        {
            EnsureCollections();
            if (edge != null && !edges.Contains(edge))
            {
                edge.EnsureInternalId();
                edges.Add(edge);
            }
        }

        internal bool RemoveEdge(AnimationEdge edge)
        {
            EnsureCollections();
            return edge != null && edges.Remove(edge);
        }

        internal void AddImportSource(FrameAnimationImportSource source)
        {
            EnsureCollections();
            if (source != null && !importSources.Contains(source))
            {
                source.EnsureInternalId();
                importSources.Add(source);
            }
        }

        internal bool RemoveImportSource(FrameAnimationImportSource source)
        {
            EnsureCollections();
            return source != null && importSources.Remove(source);
        }

        internal void SetId(string value)
        {
            id = value ?? string.Empty;
        }

        internal void SetDisplayName(string value)
        {
            displayName = value ?? string.Empty;
        }

        private void EnsureCollections()
        {
            clips ??= new List<FrameClip>();
            nodes ??= new List<AnimationNode>();
            edges ??= new List<AnimationEdge>();
            flows ??= new List<AnimationFlow>();
            importSources ??= new List<FrameAnimationImportSource>();
            settings ??= new FrameAnimationGraphSettings();
            editorData ??= new FrameAnimationGraphEditorData();
        }
    }
}