import { stringify } from '@substrate-system/json-canon'
import type { DidDocument, Service } from './types.js'

export type DidArgs = {
    host:string;
    aka?:string[],
    publicKey:string;
    service?:Service[]
}

/**
 * Create a canonical JSON string from the given DID data. The JSON returned
 * here is stable, so you can use it for things like cryptographic signatures.
 *
 * @param {DidArgs} args DID data
 * @returns {string}
 */
export function json (args:DidArgs):string {
    return stringify(did(args))
}

export function did ({
    host,
    aka,
    publicKey,
    service,
}:DidArgs):DidDocument {
    const newDid:DidDocument = {
        '@context': [
            'https://www.w3.org/ns/did/v1',
            'https://w3id.org/security/multikey/v1'
        ],
        id: `did:web:${host}`,
        verificationMethod: [
            {
                id: `did:web:${host}#main-key`,
                type: 'Multikey',
                controller: `did:web:${host}`,
                publicKeyMultibase: publicKey
            }
        ],
        authentication: [`did:web:${host}#main-key`],
        assertionMethod: [`did:web:${host}#main-key`]
    }

    if (aka) newDid.alsoKnownAs = aka
    if (service) newDid.service = service

    return newDid
}