export const runtime = 'nodejs'

export function toCamelCaseKey(key: string): string {
    return key.replace(/_([a-zA-Z])/g, (_, c: string) => c.toUpperCase());
}

export function toSnakeCaseKey(key: string): string {
    return key.replace(/[A-Z]/g, (m) => `_${m.toLowerCase()}`);
}

/**
 * 创建一个代理对象，使得读取属性时同时兼容 snake_case 与 camelCase 键名。
 * 访问顺序：原名 -> camelCase -> snake_case
 */
export function createCamelCompatibleProxy<T extends object>(root: T): T {
    const seen = new WeakMap<object, any>();

    const wrap = (value: any): any => {
        if (value === null || typeof value !== 'object') return value;
        if (seen.has(value)) return seen.get(value);
        const proxied = new Proxy(value, handler);
        seen.set(value, proxied);
        return proxied;
    };

    const handler: ProxyHandler<any> = {
        get(target, prop, receiver) {
            // 非字符串属性（如 Symbol、数字索引）直接透传
            if (typeof prop !== 'string') {
                return wrap(Reflect.get(target, prop, receiver));
            }

            const primary = prop;

            if (primary in target) return wrap(Reflect.get(target, primary, receiver));

            const camel = toCamelCaseKey(primary);
            if (camel in target) return wrap(Reflect.get(target, camel, receiver));

            const snake = toSnakeCaseKey(primary);
            if (snake in target) return wrap(Reflect.get(target, snake, receiver));

            return wrap(Reflect.get(target, prop, receiver));
        },
        has(target, prop) {
            if (typeof prop !== 'string') return prop in target;
            const primary = prop === 'auther' ? 'autherInfo' : prop;
            return (
                primary in target ||
                toCamelCaseKey(primary) in target ||
                toSnakeCaseKey(primary) in target
            );
        }
    };

    return wrap(root);
}

/** 选择首个可用 URL */
export function pickFirstUrl(list?: string[]) {
    return Array.isArray(list) && list.length ? list[0] : undefined;
}

// 别名，兼容旧命名
export const firstUrl = pickFirstUrl;