/**
 * 小游戏 / 真机包体可能裁剪 sp.SkeletonData 上的部分实例方法，但引擎在设置 skeletonData、
 * _updateSkeletonData、部分 Inspector 枚举更新时仍会调用它们。
 *
 * 这里**一次性**在原型与资源实例上补齐「赋值 skeletonData 相关链路」可能用到的 API，
 * 避免每出现一种 `xxx is not a function` 再补一处。（实现需与 engine `cocos/spine/skeleton-data.ts` 行为一致。）
 *
 * 已覆盖：resetEnums、isEmpty、getRuntimeData、getSkinsEnum、getAnimsEnum
 * sp.Skeleton 原型：resetEnums（少数版本会从组件侧调用）
 */
import { Enum, error, murmurhash2_32_gc, sp } from 'cc';

function noop() {
    // 运行态无编辑器枚举 UI，空实现即可
}

function mergedUUIDForSkeletonData(this: any): string {
    const textures = this.textures || [];
    const hashContent = [this._atlasText ?? '', ...textures.map((t: { getId: () => string }) => t.getId())].join('');
    const id = this._uuid ?? this.uuid ?? '';
    return `${id}${murmurhash2_32_gc(hashContent, 668)}`;
}

function skeletonDataGetRuntimeData(this: any, quiet?: boolean): any {
    if (this._skeletonCache) {
        return this._skeletonCache;
    }

    if (!(this.textures && this.textures.length > 0) && this.textureNames && this.textureNames.length > 0) {
        if (!quiet) {
            error(`${this.name} no textures found!`);
        }
        return null;
    }

    const wasm = sp.spine?.wasmUtil as typeof sp.spine.wasmUtil | undefined;
    if (!wasm || typeof wasm.querySpineSkeletonDataByUUID !== 'function') {
        return null;
    }
    const heap = wasm.wasm?.HEAPU8;
    if (!heap) {
        return null;
    }

    const uuid = mergedUUIDForSkeletonData.call(this);
    let spData: any;
    try {
        spData = wasm.querySpineSkeletonDataByUUID(uuid);
    } catch {
        spData = null;
    }
    if (spData) {
        this._skeletonCache = spData;
    } else {
        const texturesArr = this.textures || [];
        const size = texturesArr.length;
        const textureUUIDs: string[] = [];
        for (let i = 0; i < size; ++i) {
            const tex = texturesArr[i];
            textureUUIDs.push(tex.uuid || tex.getId());
        }
        const names = this.textureNames || [];
        if (this._skeletonJson) {
            try {
                const jsonStr =
                    typeof this.skeletonJsonStr === 'string'
                        ? this.skeletonJsonStr
                        : JSON.stringify(this._skeletonJson);
                this._skeletonCache = wasm.createSpineSkeletonDataWithJson(jsonStr, this._atlasText ?? '', names, textureUUIDs);
                wasm.registerSpineSkeletonDataWithUUID(this._skeletonCache, uuid);
            } catch (e) {
                if (!quiet) {
                    console.warn('[SpineRuntimePatch] createSpineSkeletonDataWithJson failed', this.name, e);
                }
                return null;
            }
        } else {
            const native = this._nativeAsset;
            if (!native) {
                return null;
            }
            const rawData = new Uint8Array(native);
            const byteSize = rawData.length;
            if (byteSize === 0) {
                return null;
            }
            // 与 engine 一致：先拷到 wasm 堆再解码；任一步失败都要 freeStoreMemory，否则堆状态异常会触发后续 memory access out of bounds
            const ptr = wasm.createStoreMemory(byteSize);
            try {
                const wasmMem = heap.subarray(ptr, ptr + byteSize);
                wasmMem.set(rawData);
                this._skeletonCache = wasm.createSpineSkeletonDataWithBinary(
                    byteSize,
                    this._atlasText ?? '',
                    names,
                    textureUUIDs
                );
                wasm.registerSpineSkeletonDataWithUUID(this._skeletonCache, uuid);
            } catch (e) {
                if (!quiet) {
                    console.warn(
                        '[SpineRuntimePatch] createSpineSkeletonDataWithBinary failed (资源与 Spine 运行时版本不匹配或二进制损坏时常见)',
                        this.name,
                        e
                    );
                }
                this._skeletonCache = null;
                return null;
            } finally {
                try {
                    wasm.freeStoreMemory();
                } catch {
                    /* ignore */
                }
            }
        }
    }
    return this._skeletonCache;
}

function skeletonDataIsEmpty(this: any): boolean {
    const atlas = this._atlasText;
    const atlasLen = typeof atlas === 'string' ? atlas.length : 0;
    return atlasLen === 0 && !this._skeletonJson && !this._nativeAsset;
}

function skinNameToKey(name: unknown): string {
    if (typeof name === 'string') return name;
    if (name && typeof (name as { str?: string }).str === 'string') return (name as { str: string }).str;
    return String(name ?? '');
}

/** 与 engine skeleton-data.ts getSkinsEnum() 一致 */
function skeletonDataGetSkinsEnum(this: any): Record<string, number> | null {
    if (this._skinsEnum) {
        return this._skinsEnum;
    }
    const sd = this.getRuntimeData(true);
    if (!sd) return null;
    const skins = sd.skins;
    if (!skins || skins.length === 0) {
        this._skinsEnum = Enum({});
        return this._skinsEnum;
    }
    const enumDef: Record<string, number> = {};
    for (let i = 0; i < skins.length; i++) {
        const key = skinNameToKey(skins[i]?.name);
        enumDef[key] = i;
    }
    this._skinsEnum = Enum(enumDef);
    return this._skinsEnum;
}

/** 与 engine skeleton-data.ts getAnimsEnum() 一致 */
function skeletonDataGetAnimsEnum(this: any): Record<string, number> | null {
    if (this._animsEnum && Object.keys(this._animsEnum).length > 1) {
        return this._animsEnum;
    }
    const sd = this.getRuntimeData(true);
    if (!sd) return null;
    const anims = sd.animations;
    if (!anims || anims.length === 0) {
        const empty = Enum({ ' ': 0 });
        this._animsEnum = empty;
        return this._animsEnum;
    }
    const enumDef: Record<string, number> = { ' ': 0 };
    for (let i = 0; i < anims.length; i++) {
        const key = skinNameToKey(anims[i]?.name);
        enumDef[key] = i + 1;
    }
    this._animsEnum = Enum(enumDef);
    return this._animsEnum;
}

/** 与 sp.SkeletonData 上可能被裁掉的方法一一对应 */
const SKELETON_DATA_FALLBACKS: ReadonlyArray<{ name: string; impl: (...args: any[]) => any }> = [
    { name: 'resetEnums', impl: noop },
    { name: 'isEmpty', impl: skeletonDataIsEmpty },
    { name: 'getRuntimeData', impl: skeletonDataGetRuntimeData },
    { name: 'getSkinsEnum', impl: skeletonDataGetSkinsEnum },
    { name: 'getAnimsEnum', impl: skeletonDataGetAnimsEnum },
];

/**
 * 给 sp.SkeletonData / sp.Skeleton 打齐运行时可能被裁掉的方法（可重复调用）。
 */
export function patchSpineSkeletonDataRuntime(): void {
    try {
        const sdp = sp.SkeletonData?.prototype as unknown as Record<string, unknown> | undefined;
        if (sdp) {
            for (const { name, impl } of SKELETON_DATA_FALLBACKS) {
                if (typeof sdp[name] !== 'function') {
                    sdp[name] = impl;
                }
            }
        }
        const skp = sp.Skeleton?.prototype as { resetEnums?: unknown } | undefined;
        if (skp && typeof skp.resetEnums !== 'function') {
            skp.resetEnums = noop;
        }
    } catch {
        /* ignore */
    }
}

/**
 * 赋值 skeletonData 前调用：先打原型，再处理实例。
 *
 * 第二次进局等资源从缓存取出时，实例上常见 `resetEnums: null` / 非函数占位，照样会遮住原型链，
 * 而 sp.Skeleton 的 setter 首句是 `value.resetEnums()`，表现为「第一次正常、第二次 t.resetEnums is not a function」。
 *
 * 策略：
 * 1. 删掉可配置、且值为 undefined / null / 非函数的自有「方法名」占位（不动 accessor 描述符）。
 * 2. 按顺序对 SKELETON_DATA_FALLBACKS 五项做实例兜底：若仍拿不到可调用方法则 defineProperty（优先继承的原型方法，不解构覆盖）。
 */
export function ensureSpineSkeletonDataRuntime(asset: unknown): void {
    if (asset == null) return;
    patchSpineSkeletonDataRuntime();
    const a = asset as any;
    for (const { name } of SKELETON_DATA_FALLBACKS) {
        const own = Object.getOwnPropertyDescriptor(a, name);
        if (!own || own.configurable === false || !('value' in own)) continue;
        const v = own.value;
        if (v === undefined || v === null || typeof v !== 'function') {
            try {
                delete a[name];
            } catch {
                /* ignore */
            }
        }
    }
    for (const { name, impl } of SKELETON_DATA_FALLBACKS) {
        if (typeof a[name] === 'function') continue;
        try {
            Object.defineProperty(a, name, {
                value: impl,
                writable: true,
                configurable: true,
                enumerable: false,
            });
        } catch {
            try {
                a[name] = impl;
            } catch {
                /* ignore */
            }
        }
    }
}

/** 兼容旧名：历史代码与 GameController 等仍引用此名 */
export const patchSpineSkeletonResetEnums = patchSpineSkeletonDataRuntime;

/** 兼容旧名：LangSpine / SpineLoader / SetSpine 等仍引用此名 */
export const ensureSpineAssetResetEnums = ensureSpineSkeletonDataRuntime;

patchSpineSkeletonDataRuntime();