/**
 * DTP-19 — CdnUploadToken issuance and verification.
 */

import { describe, expect, it } from "@suaveplan/testing/runner";
import type { CdnUploadToken } from "../src/index.js";
import {
    canonicalSerializeUploadToken,
    type DriveTemplateError,
    DTP_CODES,
    signUploadToken,
    UPLOAD_TOKEN_TTL_DEFAULT_MS,
    UPLOAD_TOKEN_TTL_MAX_MS,
    verifyUploadToken,
} from "../src/index.js";
import { makeKeys } from "./_helpers.js";

const NOW = 2_000_000_000;

function baseToken(): Omit<CdnUploadToken, "serverSignature" | "expiresAt"> {
    return {
        fileId: "f".repeat(64),
        chunkId: 12,
        chunkHash: "blake3:abcdef",
        uploaderPubkey: "pubkey-hex",
    };
}

describe("DTP-19 — CdnUploadToken", () => {
    it("default TTL pinned at 60s; max at 5m", { timeout: 5000 }, () => {
        expect(UPLOAD_TOKEN_TTL_DEFAULT_MS).toBe(60_000);
        expect(UPLOAD_TOKEN_TTL_MAX_MS).toBe(300_000);
    });

    it("valid token accepted", { timeout: 5000 }, () => {
        const keys = makeKeys();
        const tok = signUploadToken(
            { ...baseToken(), expiresAt: NOW + 30_000 },
            keys.secret,
            { clock: () => NOW }
        );
        expect(verifyUploadToken(tok, keys.publicHex, () => NOW + 1_000)).toBe(
            true
        );
    });

    it("expired token rejected", { timeout: 5000 }, () => {
        const keys = makeKeys();
        const tok = signUploadToken(
            { ...baseToken(), expiresAt: NOW + 30_000 },
            keys.secret,
            { clock: () => NOW }
        );
        try {
            verifyUploadToken(tok, keys.publicHex, () => NOW + 100_000);
            throw new Error("expected expired");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.CDN_BAD_SIGNATURE
            );
        }
    });

    it("tampered token rejected", { timeout: 5000 }, () => {
        const keys = makeKeys();
        const tok = signUploadToken(
            { ...baseToken(), expiresAt: NOW + 30_000 },
            keys.secret,
            { clock: () => NOW }
        );
        const tampered = { ...tok, chunkId: tok.chunkId + 1 };
        try {
            verifyUploadToken(tampered, keys.publicHex, () => NOW);
            throw new Error("expected sig failure");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.CDN_BAD_SIGNATURE
            );
        }
    });

    it("token signed by wrong key rejected", { timeout: 5000 }, () => {
        const k1 = makeKeys();
        const k2 = makeKeys();
        const tok = signUploadToken(
            { ...baseToken(), expiresAt: NOW + 30_000 },
            k1.secret,
            { clock: () => NOW }
        );
        try {
            verifyUploadToken(tok, k2.publicHex, () => NOW);
            throw new Error("expected sig failure");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.CDN_BAD_SIGNATURE
            );
        }
    });

    it("invalid server pubkey hex rejected", { timeout: 5000 }, () => {
        const keys = makeKeys();
        const tok = signUploadToken(
            { ...baseToken(), expiresAt: NOW + 30_000 },
            keys.secret,
            { clock: () => NOW }
        );
        try {
            verifyUploadToken(tok, "not-hex", () => NOW);
            throw new Error("expected pubkey rejection");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.CDN_BAD_SIGNATURE
            );
        }
    });

    it("ttlMs out of range rejected at sign", { timeout: 5000 }, () => {
        const keys = makeKeys();
        expect(() =>
            signUploadToken({ ...baseToken(), expiresAt: 0 }, keys.secret, {
                clock: () => NOW,
                ttlMs: 0,
            })
        ).toThrow();
        expect(() =>
            signUploadToken({ ...baseToken(), expiresAt: 0 }, keys.secret, {
                clock: () => NOW,
                ttlMs: UPLOAD_TOKEN_TTL_MAX_MS + 1,
            })
        ).toThrow();
    });

    it("canonicalSerializeUploadToken is deterministic", {
        timeout: 5000,
    }, () => {
        const tok = { ...baseToken(), expiresAt: NOW + 30_000 };
        const a = canonicalSerializeUploadToken(tok);
        const b = canonicalSerializeUploadToken(tok);
        expect(a).toEqual(b);
    });

    it("default options use Date.now() as clock", { timeout: 5000 }, () => {
        const keys = makeKeys();
        const tok = signUploadToken(
            { ...baseToken(), expiresAt: 0 },
            keys.secret
        );
        expect(tok.expiresAt).toBeGreaterThan(0);
    });

    it("malformed signature buffer triggers verify catch arm", {
        timeout: 5000,
    }, () => {
        const keys = makeKeys();
        const tok = signUploadToken(
            { ...baseToken(), expiresAt: NOW + 30_000 },
            keys.secret,
            { clock: () => NOW }
        );
        const broken = { ...tok, serverSignature: new Uint8Array(8) };
        try {
            verifyUploadToken(broken, keys.publicHex, () => NOW);
            throw new Error("expected rejection");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.CDN_BAD_SIGNATURE
            );
        }
    });
});