using System;
using System.Linq;
using UnityEditor;
using UnityEngine;

namespace AibisDream.FrameAnimation.Editor
{
    public static class FrameAnimationPreviewSampleBuilder
    {
        private const string Folder = "Assets/GameContent/Test/FrameAnimation/Preview";
        private const string GraphPath = Folder + "/PreviewSampleGraph.asset";
        private const string TexturePath = "Assets/GameContent/Test/AnimatorRaw/手接树叶特写.png";

        [MenuItem("Tools/Frame Animation/Create Phase 5 Preview Sample")]
        public static void BuildFromCommandLine()
        {
            if (AssetDatabase.LoadAssetAtPath<FrameAnimationGraph>(GraphPath) != null)
            {
                Debug.Log($"Frame Animation preview sample already exists; preserved without overwrite: {GraphPath}");
                return;
            }
            EnsureFolder(Folder);
            var sprites = AssetDatabase.LoadAllAssetsAtPath(TexturePath).OfType<Sprite>()
                .OrderBy(sprite => sprite.name, StringComparer.Ordinal).ToArray();
            if (sprites.Length < 6)
            {
                throw new InvalidOperationException("第五阶段预览样例需要至少 6 个已切分 Sprite。");
            }

            var graph = ScriptableObject.CreateInstance<FrameAnimationGraph>();
            graph.name = "PreviewSampleGraph";
            AssetDatabase.CreateAsset(graph, GraphPath);
            var action = CreateClip(graph, "PreviewAction", "Preview Action", FrameClipEndBehavior.HoldLastFrame,
                new[]
                {
                    new FrameAnimationFrame(sprites[0], 100, sprites[0].name, 0),
                    new FrameAnimationFrame(sprites[1], 160, sprites[1].name, 1),
                    new FrameAnimationFrame(sprites[2], 220, sprites[2].name, 2)
                });
            var withEmpty = CreateClip(graph, "PreviewEmpty", "Preview Empty Frame", FrameClipEndBehavior.HoldLastFrame,
                new[]
                {
                    new FrameAnimationFrame(sprites[3], 120, sprites[3].name, 3),
                    new FrameAnimationFrame(null, 300, "empty", -1),
                    new FrameAnimationFrame(sprites[4], 120, sprites[4].name, 4)
                });
            var idle = CreateClip(graph, "PreviewIdle", "Preview Idle Loop", FrameClipEndBehavior.Loop,
                new[]
                {
                    new FrameAnimationFrame(sprites[4], 140, sprites[4].name, 4),
                    new FrameAnimationFrame(sprites[5], 140, sprites[5].name, 5)
                });

            var finiteA = new AnimationNode(action.Id, "Finite Action", speedOverride: 2f,
                internalId: "51000000000000000000000000000001");
            var finiteB = new AnimationNode(withEmpty.Id, "Finite Empty",
                endBehaviorOverride: FrameClipEndBehavior.HoldLastFrame,
                internalId: "51000000000000000000000000000002");
            var loopA = new AnimationNode(action.Id, "Loop Intro", internalId: "51000000000000000000000000000003");
            var loopB = new AnimationNode(idle.Id, "Loop Terminal",
                endBehaviorOverride: FrameClipEndBehavior.Loop,
                internalId: "51000000000000000000000000000004");
            var blocked = new AnimationNode(withEmpty.Id, "Zero Speed Block", speedOverride: 0f,
                internalId: "51000000000000000000000000000005");
            var clear = new AnimationNode(action.Id, "Clear Terminal",
                endBehaviorOverride: FrameClipEndBehavior.Clear,
                internalId: "51000000000000000000000000000006");
            var hidden = new AnimationNode(idle.Id, "Hide Terminal",
                endBehaviorOverride: FrameClipEndBehavior.HideTarget,
                internalId: "51000000000000000000000000000007");
            var finiteFlow = new AnimationFlow("PreviewFiniteFlow", "Finite Flow", finiteA.InternalId);
            var loopFlow = new AnimationFlow("PreviewLoopFlow", "Loop Flow", loopA.InternalId);
            var blockedFlow = new AnimationFlow("PreviewBlockedFlow", "Zero Speed Flow", blocked.InternalId);
            var clearFlow = new AnimationFlow("PreviewClearFlow", "Clear Flow", clear.InternalId);
            var hideFlow = new AnimationFlow("PreviewHideFlow", "Hide Flow", hidden.InternalId);
            graph.Configure(
                "PreviewSampleGraph",
                "Phase 5 Preview Sample",
                new[] { action, withEmpty, idle },
                new[] { finiteA, finiteB, loopA, loopB, blocked, clear, hidden },
                new[]
                {
                    new AnimationEdge(finiteA.InternalId, finiteB.InternalId, "52000000000000000000000000000001"),
                    new AnimationEdge(loopA.InternalId, loopB.InternalId, "52000000000000000000000000000002")
                },
                new[] { finiteFlow, loopFlow, blockedFlow, clearFlow, hideFlow },
                finiteFlow.Id);

            var positions = new[]
            {
                (finiteA, new Vector2(80f, 80f)), (finiteB, new Vector2(420f, 80f)),
                (loopA, new Vector2(80f, 320f)), (loopB, new Vector2(420f, 320f)),
                (blocked, new Vector2(80f, 560f)), (clear, new Vector2(420f, 560f)),
                (hidden, new Vector2(760f, 560f))
            };
            foreach (var item in positions)
            {
                graph.EditorData.GetOrCreateNodeData(item.Item1.InternalId, item.Item2);
            }
            var colors = new[]
            {
                new Color(0.25f, 0.65f, 0.95f), new Color(0.55f, 0.4f, 0.9f),
                new Color(0.9f, 0.55f, 0.2f), new Color(0.3f, 0.75f, 0.5f), new Color(0.85f, 0.35f, 0.45f)
            };
            var flows = graph.Flows.ToArray();
            for (var index = 0; index < flows.Length; index++)
            {
                graph.EditorData.GetOrCreateFlowData(flows[index].Id, colors[index]);
            }
            EditorUtility.SetDirty(graph);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Debug.Log($"Frame Animation phase 5 preview sample created: {GraphPath}");
        }

        private static FrameClip CreateClip(
            FrameAnimationGraph graph,
            string id,
            string displayName,
            FrameClipEndBehavior endBehavior,
            FrameAnimationFrame[] frames)
        {
            var clip = ScriptableObject.CreateInstance<FrameClip>();
            clip.name = id;
            clip.Configure(id, displayName, frames, 1f, endBehavior);
            AssetDatabase.AddObjectToAsset(clip, graph);
            return clip;
        }

        private static void EnsureFolder(string path)
        {
            var segments = path.Split('/');
            var current = segments[0];
            for (var index = 1; index < segments.Length; index++)
            {
                var next = current + "/" + segments[index];
                if (!AssetDatabase.IsValidFolder(next)) AssetDatabase.CreateFolder(current, segments[index]);
                current = next;
            }
        }
    }
}