import { readFileSync } from "node:fs"
import { createSign } from "node:crypto";
import Fastify from "fastify";

const { private: M2M_PRIVATE_KEY, public: M2M_PUBLIC_KEY } = loadM2MKeys()
const M2M_ALGORITHM = "RSA-SHA512"

const ASSETS_FOLDER = "~/.assets/"
const ASSET_API_LANDING_MESSAGE = "asset-api v1.0.0"

const IDENTITY_API_ENDPOINT = "http://localhost:3000"

const fastify = new Fastify({
    logger: true,
})

fastify.get("/", async (request, reply) => {
    return signString(ASSET_API_LANDING_MESSAGE)
})

fastify.get("/crypto/cert", async (request, reply) => {
    return M2M_PUBLIC_KEY
})

fastify.get("/crypto/algo", (request, reply) => {
    return M2M_ALGORITHM
})

fastify.get("/asset", {
    async handler(request, reply) {
        let url = new URL(IDENTITY_API_ENDPOINT)
        url.pathname = "/auth/account/fromkey"

        let res = await fetch(url, {
            method: "POST",
            body: signString(JSON.stringify({
                session_key: request.query.session_key,
            }))
        })

        return await res.text()
    },
    schema: {
        query: {
            type: "object",
            properties: {
                id: { type: "string" },
                session_key: { type: "string" },
            },
            required: ["id", "session_key"],
        },
    },
})

fastify.listen({ port: 3001 })

function loadM2MKeys() {
    return {
        private: readFileSync("../.keys/m2m-dev.pem").toString("ascii"),
        public: readFileSync("../.keys/m2m-dev.pub").toString("ascii"),
    }
}

function signString(content) {
    let sign = createSign(M2M_ALGORITHM)
    sign.update(content)
    return `-----BEGIN SIGNED MESSAGE-----\n\n${content}\n\n-----BEGIN SIGNATURE-----\n\n${sign.sign(M2M_PRIVATE_KEY, "base64")}\n-----END SIGNATURE-----`
}