import {
  consumeToolboxTransfer,
  createToolboxTransfer,
  createToolboxTransferUrl,
  readToolboxTransferToken,
  type ToolboxTransfer,
  type ToolboxTransferStore,
} from "../src/index.js";
import { describe, expect, it } from "vitest";

class MemoryStore implements ToolboxTransferStore {
  readonly values = new Map<string, ToolboxTransfer>();

  async put(transfer: ToolboxTransfer): Promise<void> {
    this.values.set(transfer.token, transfer);
  }

  async take(
    token: string,
    expectedTargetAppId: string,
    now: number,
  ): Promise<ToolboxTransfer | undefined> {
    const value = this.values.get(token);
    if (value !== undefined && value.targetAppId !== expectedTargetAppId) {
      throw new Error("Artifact transfer was addressed to another application");
    }
    this.values.delete(token);
    return value === undefined || value.expiresAt <= now ? undefined : value;
  }

  async deleteExpired(now: number): Promise<number> {
    let count = 0;
    for (const [token, value] of this.values) {
      if (value.expiresAt <= now) {
        this.values.delete(token);
        count += 1;
      }
    }
    return count;
  }
}

const deterministicCrypto = {
  getRandomValues<T extends ArrayBufferView | null>(array: T): T {
    if (array instanceof Uint8Array)
      array.forEach((_value, index) => (array[index] = index));
    return array;
  },
};

describe("one-time artifact transfers", () => {
  it("stores, addresses and consumes an artifact exactly once", async () => {
    const store = new MemoryStore();
    const blob = new Blob(["hello"], { type: "text/plain" });
    const transfer = await createToolboxTransfer(
      {
        source: { appId: "de.add-ideas.file-tools", appVersion: "1.0.0" },
        targetAppId: "de.add-ideas.text-tools",
        files: [
          { blob, name: "hello.txt", mediaType: blob.type, size: blob.size },
        ],
      },
      { store, crypto: deterministicCrypto, now: () => 1_000 },
    );
    expect(transfer.token).toHaveLength(22);
    const url = createToolboxTransferUrl(
      "https://tools.test/apps/text/",
      transfer.token,
      { location: "https://tools.test/apps/file/" },
    );
    expect(readToolboxTransferToken(url)).toBe(transfer.token);
    const consumed = await consumeToolboxTransfer(
      transfer.token,
      "de.add-ideas.text-tools",
      { store, now: () => 2_000 },
    );
    expect(await consumed?.files[0]?.blob.text()).toBe("hello");
    expect(
      await consumeToolboxTransfer(transfer.token, "de.add-ideas.text-tools", {
        store,
        now: () => 2_000,
      }),
    ).toBeUndefined();
  });

  it("rejects expired, oversized and wrongly addressed transfers", async () => {
    const store = new MemoryStore();
    const blob = new Blob(["hello"]);
    const transfer = await createToolboxTransfer(
      {
        source: { appId: "source" },
        targetAppId: "target",
        ttlMs: 10,
        files: [{ blob, name: "a.bin", mediaType: "", size: blob.size }],
      },
      { store, crypto: deterministicCrypto, now: () => 10 },
    );
    await expect(
      consumeToolboxTransfer(transfer.token, "target", {
        store,
        now: () => 20,
      }),
    ).resolves.toBeUndefined();
    await expect(
      createToolboxTransfer(
        {
          source: { appId: "source" },
          targetAppId: "target",
          maxBytes: 4,
          files: [{ blob, name: "a.bin", mediaType: "", size: blob.size }],
        },
        { store, crypto: deterministicCrypto },
      ),
    ).rejects.toThrow(/exceeds/u);
    await expect(
      createToolboxTransfer(
        {
          source: { appId: "source" },
          targetAppId: "target",
          maxBytes: 512 * 1024 * 1024 + 1,
          files: [{ blob, name: "a.bin", mediaType: "", size: blob.size }],
        },
        { store, crypto: deterministicCrypto },
      ),
    ).rejects.toThrow(/invalid/iu);
    await expect(
      createToolboxTransfer(
        {
          source: { appId: "source" },
          targetAppId: "target",
          files: [{ blob, name: "a.bin", mediaType: "", size: blob.size }],
        },
        { store, crypto: deterministicCrypto, now: () => Number.NaN },
      ),
    ).rejects.toThrow(/creation time/iu);

    const addressed = await createToolboxTransfer(
      {
        source: { appId: "source" },
        targetAppId: "target",
        files: [{ blob, name: "a.bin", mediaType: "", size: blob.size }],
      },
      { store, crypto: deterministicCrypto },
    );
    await expect(
      consumeToolboxTransfer(addressed.token, "another-target", { store }),
    ).rejects.toThrow(/another application/u);
  });

  it("keeps opaque handoff tokens on-origin and rejects unsafe descriptors", async () => {
    const store = new MemoryStore();
    const blob = new Blob(["hello"]);
    await expect(
      createToolboxTransfer(
        {
          source: { appId: "source" },
          targetAppId: "target",
          files: [
            {
              blob,
              name: "../hello.txt",
              mediaType: "text/plain",
              size: blob.size,
            },
          ],
        },
        { store, crypto: deterministicCrypto },
      ),
    ).rejects.toThrow(/name is invalid/u);
    expect(() =>
      createToolboxTransferUrl(
        "https://other.test/apps/text/",
        "AAECAwQFBgcICQoLDA0ODw",
        { location: "https://tools.test/apps/file/" },
      ),
    ).toThrow(/current origin/u);
  });

  it("revalidates same-origin storage records at the consuming trust boundary", async () => {
    const store = new MemoryStore();
    const blob = new Blob(["hello"]);
    const transfer = await createToolboxTransfer(
      {
        source: { appId: "source" },
        targetAppId: "target",
        files: [{ blob, name: "hello.txt", mediaType: "text/plain", size: 5 }],
      },
      { store, crypto: deterministicCrypto, now: () => 100 },
    );
    store.values.set(transfer.token, {
      ...transfer,
      artifactVersion: 99 as 1,
    });
    await expect(
      consumeToolboxTransfer(transfer.token, "target", {
        store,
        now: () => 200,
      }),
    ).rejects.toThrow(/identity is invalid/u);
    expect(store.values.has(transfer.token)).toBe(false);
  });
});