import type { ResourceContextVersion } from '../context.js';
import type { KNOWN_RESOURCE_TYPE_ID, ResourceOf, ResourceRevisionOf } from '../known-resource-types.js';
import { ResourcePermission } from '../permission.js';

/** 通用迁移过程 */
export function preMigrate<T extends KNOWN_RESOURCE_TYPE_ID>(type: T, resource: ResourceOf<T>): void {
    if (resource == null || typeof resource != 'object') {
        throw new TypeError(`Invalid ${type} object`);
    }
    const revision = resource?.revision;
    if (revision == null || typeof revision !== 'object') {
        throw new TypeError(`Invalid ${type} revision object`);
    }
    const revVersion = revision.version ?? 1;
    if (typeof revVersion != 'number' || !Number.isFinite(revVersion)) {
        throw new TypeError(`Invalid ${type} revision version: ${JSON.stringify(revVersion)}`);
    }

    // 初始化缺失字段
    resource.name ??= '';
    resource.description ??= '';
    resource.tags ??= [];
    resource.keywords ??= [];
    resource.context ??= { version: 4 as ResourceContextVersion };
    resource.context.version ??= 4 as ResourceContextVersion;
    resource.permissions ??= {
        moderator: ResourcePermission.EMPTY,
        member: ResourcePermission.EMPTY,
        everyone: ResourcePermission.EMPTY,
    };

    revision.version = revVersion;
    revision.author ??= '';
    revision.message ??= '';
    revision.documentation ??= '';
}

/** revision 迁移 */
export async function migrateRevision<T extends KNOWN_RESOURCE_TYPE_ID>(
    type: T,
    revision: ResourceRevisionOf<T>,
    migrator: (resource: ResourceOf<T>) => Promise<void>,
): Promise<void> {
    const resource = {
        revision,
        context: { version: revision.version as number as ResourceContextVersion },
    } as ResourceOf<T>;
    await migrator(resource);
}