using System;
using System.Collections.Generic;
using UnityEngine;

namespace AibisDream.FrameAnimation
{
    [Serializable]
    public sealed class FrameAnimationFrame
    {
        [SerializeField] private Sprite sprite;
        [SerializeField] private int durationMs = 100;
        [SerializeField] private string frameName = string.Empty;
        [SerializeField] private int sourceIndex = -1;

        public Sprite Sprite => sprite;
        public int DurationMs => durationMs;
        public string FrameName => frameName;
        public int SourceIndex => sourceIndex;

        public FrameAnimationFrame()
        {
        }

        internal FrameAnimationFrame(Sprite sprite, int durationMs, string frameName, int sourceIndex)
        {
            this.sprite = sprite;
            this.durationMs = durationMs;
            this.frameName = frameName ?? string.Empty;
            this.sourceIndex = sourceIndex;
        }
    }

    [Serializable]
    public sealed class FrameClipImportInfo
    {
        [SerializeField] private string importSourceId = string.Empty;
        [SerializeField] private string sourceTagName = string.Empty;
        [SerializeField] private bool isMissingFromSource;

        public string ImportSourceId => importSourceId;
        public string SourceTagName => sourceTagName;
        public bool IsMissingFromSource => isMissingFromSource;

        internal FrameClipImportInfo(string importSourceId, string sourceTagName, bool isMissingFromSource)
        {
            this.importSourceId = importSourceId ?? string.Empty;
            this.sourceTagName = sourceTagName ?? string.Empty;
            this.isMissingFromSource = isMissingFromSource;
        }

        internal void Update(string sourceId, string tagName, bool missingFromSource)
        {
            importSourceId = sourceId ?? string.Empty;
            sourceTagName = tagName ?? string.Empty;
            isMissingFromSource = missingFromSource;
        }
    }

    /// <summary>
    /// Editor-time source settings owned by an external FrameClip asset.
    /// This is intentionally separate from graph-owned FrameClipImportInfo.
    /// </summary>
    [Serializable]
    public sealed class FrameClipImportSource
    {
        [SerializeField] private Texture2D texture;
        [SerializeField] private TextAsset asepriteJson;
        [SerializeField] private Vector2 pivot = new Vector2(0.5f, 0.5f);
        [SerializeField] private bool manageSpriteSlicing;
        [SerializeField] private string lastSourceHash = string.Empty;
        [SerializeField] private string lastImportedTagName = string.Empty;

        public Texture2D Texture => texture;
        public TextAsset AsepriteJson => asepriteJson;
        public Vector2 Pivot => pivot;
        public bool ManageSpriteSlicing => manageSpriteSlicing;
        public string LastSourceHash => lastSourceHash;
        public string LastImportedTagName => lastImportedTagName;

        internal void SetLastImport(string sourceHash, string tagName)
        {
            lastSourceHash = sourceHash ?? string.Empty;
            lastImportedTagName = tagName ?? string.Empty;
        }
    }

    [Serializable]
    public sealed class AnimationFlow
    {
        [SerializeField] private string id = string.Empty;
        [SerializeField] private string displayName = string.Empty;
        [SerializeField] private string entryNodeId = string.Empty;
        [SerializeField] private bool hasEndBehaviorOverride;
        [SerializeField] private FrameClipEndBehavior endBehaviorOverride;

        public string Id => id;
        public string DisplayName => displayName;
        public string EntryNodeId => entryNodeId;
        public FrameClipEndBehavior? EndBehaviorOverride =>
            hasEndBehaviorOverride ? endBehaviorOverride : (FrameClipEndBehavior?)null;

        public AnimationFlow()
        {
        }

        internal AnimationFlow(
            string id,
            string displayName,
            string entryNodeId,
            FrameClipEndBehavior? endBehaviorOverride = null)
        {
            this.id = id ?? string.Empty;
            this.displayName = displayName ?? this.id;
            this.entryNodeId = entryNodeId ?? string.Empty;
            SetEndBehaviorOverride(endBehaviorOverride);
        }

        internal void SetEndBehaviorOverride(FrameClipEndBehavior? value)
        {
            hasEndBehaviorOverride = value.HasValue;
            endBehaviorOverride = value.GetValueOrDefault();
        }

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

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

        internal void SetEntryNodeId(string value)
        {
            entryNodeId = value ?? string.Empty;
        }
    }

    [Serializable]
    public sealed class AnimationNode
    {
        [SerializeField] private string internalId = string.Empty;
        [SerializeField] private string displayName = string.Empty;
        [SerializeField] private AnimationNodeType type = AnimationNodeType.Clip;
        [SerializeField] private string clipId = string.Empty;
        [SerializeField] private bool hasEndBehaviorOverride;
        [SerializeField] private FrameClipEndBehavior endBehaviorOverride;
        [SerializeField] private bool hasSpeedOverride;
        [SerializeField] private float speedOverride = 1f;

        public string InternalId => internalId;
        public string DisplayName => displayName;
        public AnimationNodeType Type => type;
        public string ClipId => clipId;
        public FrameClipEndBehavior? EndBehaviorOverride =>
            hasEndBehaviorOverride ? endBehaviorOverride : (FrameClipEndBehavior?)null;
        public float? SpeedOverride => hasSpeedOverride ? speedOverride : (float?)null;

        public AnimationNode()
        {
        }

        internal AnimationNode(
            string clipId,
            string displayName = null,
            FrameClipEndBehavior? endBehaviorOverride = null,
            float? speedOverride = null,
            string internalId = null)
        {
            this.internalId = string.IsNullOrEmpty(internalId)
                ? FrameAnimationValueUtility.NewInternalId()
                : internalId;
            this.displayName = displayName ?? clipId ?? string.Empty;
            type = AnimationNodeType.Clip;
            this.clipId = clipId ?? string.Empty;
            SetEndBehaviorOverride(endBehaviorOverride);
            SetSpeedOverride(speedOverride);
        }

        internal void EnsureInternalId()
        {
            if (string.IsNullOrWhiteSpace(internalId))
            {
                internalId = FrameAnimationValueUtility.NewInternalId();
            }
        }

        internal void SetEndBehaviorOverride(FrameClipEndBehavior? value)
        {
            hasEndBehaviorOverride = value.HasValue;
            endBehaviorOverride = value.GetValueOrDefault();
        }

        internal void SetSpeedOverride(float? value)
        {
            hasSpeedOverride = value.HasValue;
            speedOverride = value.GetValueOrDefault(1f);
        }

        internal void SetClipId(string value)
        {
            clipId = value ?? string.Empty;
        }

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

    [Serializable]
    public sealed class AnimationEdge
    {
        [SerializeField] private string internalId = string.Empty;
        [SerializeField] private string fromNodeId = string.Empty;
        [SerializeField] private string toNodeId = string.Empty;
        [SerializeField] private string exitName = "default";
        [SerializeField] private AnimationEdgeCondition condition = AnimationEdgeCondition.Always;

        public string InternalId => internalId;
        public string FromNodeId => fromNodeId;
        public string ToNodeId => toNodeId;
        public string ExitName => exitName;
        public AnimationEdgeCondition Condition => condition;

        public AnimationEdge()
        {
        }

        internal AnimationEdge(string fromNodeId, string toNodeId, string internalId = null)
        {
            this.internalId = string.IsNullOrEmpty(internalId)
                ? FrameAnimationValueUtility.NewInternalId()
                : internalId;
            this.fromNodeId = fromNodeId ?? string.Empty;
            this.toNodeId = toNodeId ?? string.Empty;
            exitName = "default";
            condition = AnimationEdgeCondition.Always;
        }

        internal void EnsureInternalId()
        {
            if (string.IsNullOrWhiteSpace(internalId))
            {
                internalId = FrameAnimationValueUtility.NewInternalId();
            }
        }
    }

    [Serializable]
    public sealed class FrameAnimationImportSource
    {
        [SerializeField] private string internalId = string.Empty;
        [SerializeField] private string displayName = string.Empty;
        [SerializeField] private bool isEnabled = true;
        [SerializeField] private Texture2D texture;
        [SerializeField] private TextAsset asepriteJson;
        [SerializeField] private Vector2 pivot = new Vector2(0.5f, 0.5f);
        [SerializeField] private bool manageSpriteSlicing;
        [SerializeField] private FrameClipEndBehavior defaultNewClipEndBehavior =
            FrameClipEndBehavior.HoldLastFrame;
        [SerializeField] private string lastSourceHash = string.Empty;

        public string InternalId => internalId;
        public string DisplayName => displayName;
        public bool IsEnabled => isEnabled;
        public Texture2D Texture => texture;
        public TextAsset AsepriteJson => asepriteJson;
        public Vector2 Pivot => pivot;
        public bool ManageSpriteSlicing => manageSpriteSlicing;
        public FrameClipEndBehavior DefaultNewClipEndBehavior => defaultNewClipEndBehavior;
        public string LastSourceHash => lastSourceHash;

        public FrameAnimationImportSource()
        {
        }

        internal FrameAnimationImportSource(
            string sourceDisplayName,
            Texture2D sourceTexture,
            TextAsset sourceJson,
            Vector2 sourcePivot,
            bool ownsSpriteSlicing,
            FrameClipEndBehavior newClipEndBehavior = FrameClipEndBehavior.HoldLastFrame,
            string sourceInternalId = null)
        {
            internalId = string.IsNullOrWhiteSpace(sourceInternalId)
                ? FrameAnimationValueUtility.NewInternalId()
                : sourceInternalId;
            displayName = sourceDisplayName ?? string.Empty;
            isEnabled = true;
            texture = sourceTexture;
            asepriteJson = sourceJson;
            pivot = sourcePivot;
            manageSpriteSlicing = ownsSpriteSlicing;
            defaultNewClipEndBehavior = newClipEndBehavior;
        }

        internal void EnsureInternalId()
        {
            if (string.IsNullOrWhiteSpace(internalId))
            {
                internalId = FrameAnimationValueUtility.NewInternalId();
            }
        }

        internal void SetLastSourceHash(string value)
        {
            lastSourceHash = value ?? string.Empty;
        }
    }

    [Serializable]
    public sealed class FrameAnimationGraphSettings
    {
        [SerializeField] private string defaultPlayableId = string.Empty;
        [SerializeField] private FrameClipEndBehavior newManualClipDefaultEndBehavior =
            FrameClipEndBehavior.HoldLastFrame;

        public string DefaultPlayableId => defaultPlayableId;
        public FrameClipEndBehavior NewManualClipDefaultEndBehavior => newManualClipDefaultEndBehavior;

        internal void SetDefaultPlayableId(string value)
        {
            defaultPlayableId = value ?? string.Empty;
        }

        internal void SetNewManualClipDefaultEndBehavior(FrameClipEndBehavior value)
        {
            newManualClipDefaultEndBehavior = value;
        }
    }

    [Serializable]
    public sealed class AnimationNodeEditorData
    {
        [SerializeField] private string nodeId = string.Empty;
        [SerializeField] private Vector2 position;

        public string NodeId => nodeId;
        public Vector2 Position => position;

        internal AnimationNodeEditorData(string nodeId, Vector2 position)
        {
            this.nodeId = nodeId ?? string.Empty;
            this.position = position;
        }

        internal void SetPosition(Vector2 value)
        {
            position = value;
        }
    }

    [Serializable]
    public sealed class AnimationFlowEditorData
    {
        [SerializeField] private string flowId = string.Empty;
        [SerializeField] private Color color = Color.white;

        public string FlowId => flowId;
        public Color Color => color;

        internal AnimationFlowEditorData(string flowId, Color color)
        {
            this.flowId = flowId ?? string.Empty;
            this.color = color;
        }

        internal void SetFlowId(string value)
        {
            flowId = value ?? string.Empty;
        }

        internal void SetColor(Color value)
        {
            color = value;
        }
    }

    [Serializable]
    public sealed class FrameAnimationGraphEditorData
    {
        [SerializeField] private List<AnimationNodeEditorData> nodeEditorData = new List<AnimationNodeEditorData>();
        [SerializeField] private List<AnimationFlowEditorData> flowEditorData = new List<AnimationFlowEditorData>();

        public IReadOnlyList<AnimationNodeEditorData> NodeEditorData => nodeEditorData;
        public IReadOnlyList<AnimationFlowEditorData> FlowEditorData => flowEditorData;

        internal AnimationNodeEditorData GetOrCreateNodeData(string nodeId, Vector2 position)
        {
            nodeEditorData ??= new List<AnimationNodeEditorData>();
            var existing = nodeEditorData.Find(data => data != null && data.NodeId == nodeId);
            if (existing != null)
            {
                return existing;
            }
            var created = new AnimationNodeEditorData(nodeId, position);
            nodeEditorData.Add(created);
            return created;
        }

        internal bool RemoveNodeData(string nodeId)
        {
            nodeEditorData ??= new List<AnimationNodeEditorData>();
            return nodeEditorData.RemoveAll(data => data != null && data.NodeId == nodeId) > 0;
        }

        internal AnimationFlowEditorData GetOrCreateFlowData(string flowId, Color color)
        {
            flowEditorData ??= new List<AnimationFlowEditorData>();
            var existing = flowEditorData.Find(data => data != null && data.FlowId == flowId);
            if (existing != null)
            {
                return existing;
            }
            var created = new AnimationFlowEditorData(flowId, color);
            flowEditorData.Add(created);
            return created;
        }

        internal bool RemoveFlowData(string flowId)
        {
            flowEditorData ??= new List<AnimationFlowEditorData>();
            return flowEditorData.RemoveAll(data => data != null && data.FlowId == flowId) > 0;
        }
    }
}