import { describe, expect, it } from "vitest";

import type { ResumableUploadCheckpoint } from "../../src/application/ports/browser-transfer/resumable-upload.ts";
import { RESUMABLE_UPLOAD_PROTOCOL } from "../../src/application/ports/browser-transfer/resumable-upload.ts";
import {
  createIndexedDbResumableUploadCheckpointRuntime,
  createIndexedDbResumableUploadCheckpointStore,
  uploadCheckpointDatabaseName,
} from "../../src/adapters/browser-transfer/resumable-upload/indexeddb-checkpoint-store.ts";
import { MemoryIndexedDbFactory } from "../helpers/memory-indexeddb.ts";

const scope = Object.freeze({
  authorityToken: "authority_token_01",
  namespaceToken: "namespace_token_01",
  partitionToken: "partition_token_01",
});

function checkpoint(
  revision: number,
  overrides: Partial<ResumableUploadCheckpoint> = {},
): ResumableUploadCheckpoint {
  return {
    schemaVersion: 1,
    protocol: RESUMABLE_UPLOAD_PROTOCOL,
    revision,
    state: "ACTIVE",
    uploadKey: "upload_key_01",
    requestBindingSha256: "a".repeat(64),
    fingerprint: {
      algorithm: "SHA-256-PARTS-V1",
      digestHex: "b".repeat(64),
      byteLength: 4,
      partSizeBytes: 4,
      partCount: 1,
    },
    sessionId: "session_01",
    sessionExpiresAtEpochMs: 5_000,
    sessionMaxConcurrency: 1,
    acceptedParts: [],
    updatedAtEpochMs: 1_000,
    ...overrides,
  };
}

function deletingFactory(
  memory: MemoryIndexedDbFactory,
  mode: "SUCCESS" | "BLOCKED",
): IDBFactory {
  return {
    open: memory.factory.open.bind(memory.factory),
    cmp: memory.factory.cmp.bind(memory.factory),
    deleteDatabase: () => {
      const request = {
        result: undefined,
        error: null,
        transaction: null,
        source: null,
        readyState: "pending",
        onsuccess: null,
        onerror: null,
        onblocked: null,
        onupgradeneeded: null,
        addEventListener() {},
        removeEventListener() {},
        dispatchEvent: () => true,
      } as unknown as IDBOpenDBRequest;
      queueMicrotask(() => {
        if (mode === "SUCCESS") {
          request.onsuccess?.(new Event("success"));
        } else {
          request.onblocked?.({
            oldVersion: 1,
            newVersion: null,
          } as IDBVersionChangeEvent);
        }
      });
      return request;
    },
    databases: async () => [],
  } as IDBFactory;
}

describe("IndexedDB resumable upload checkpoint", () => {
  it("length-prefixes scope tuples so delimiter placement cannot collide", () => {
    const first = uploadCheckpointDatabaseName({
      authorityToken: "aaaaaaaa-bbbbbbbb",
      namespaceToken: "cccccccc",
      partitionToken: "dddddddd",
    });
    const second = uploadCheckpointDatabaseName({
      authorityToken: "aaaaaaaa",
      namespaceToken: "bbbbbbbb-cccccccc",
      partitionToken: "dddddddd",
    });

    expect(first).not.toBe(second);
    expect(first).toContain("17:aaaaaaaa-bbbbbbbb");
    expect(second).toContain("8:aaaaaaaa");
  });

  it("commits CAS only at transaction completion and rejects stale revisions", async () => {
    const memory = new MemoryIndexedDbFactory();
    const store = createIndexedDbResumableUploadCheckpointStore({
      scope,
      factory: memory.factory,
    });
    const first = checkpoint(1);
    expect(
      await store.compareAndSwap({
        expectedRevision: null,
        checkpoint: first,
      }),
    ).toEqual({ ok: true, value: first });
    expect(await store.read(first.uploadKey)).toEqual({
      ok: true,
      value: first,
    });

    memory.failNextWriteCommit(
      new DOMException("commit failed", "UnknownError"),
    );
    const failed = await store.compareAndSwap({
      expectedRevision: 1,
      checkpoint: checkpoint(2, { state: "ABORT_PENDING" }),
    });
    expect(failed).toMatchObject({
      ok: false,
      error: { code: "UNAVAILABLE" },
    });
    expect(await store.read(first.uploadKey)).toEqual({
      ok: true,
      value: first,
    });

    expect(
      await store.compareAndSwap({
        expectedRevision: 2,
        checkpoint: checkpoint(3),
      }),
    ).toMatchObject({
      ok: false,
      error: { code: "CONFLICT", recovery: "RECONCILE" },
    });
  });

  it("rejects unknown persisted fields so URLs and credentials cannot enter a checkpoint", async () => {
    const memory = new MemoryIndexedDbFactory();
    const store = createIndexedDbResumableUploadCheckpointStore({
      scope,
      factory: memory.factory,
    });
    const smuggled = {
      ...checkpoint(1),
      signedUrl: "https://object.invalid/secret?signature=value",
    } as unknown as ResumableUploadCheckpoint;
    expect(
      await store.compareAndSwap({
        expectedRevision: null,
        checkpoint: smuggled,
      }),
    ).toMatchObject({
      ok: false,
      error: { code: "INVALID_INPUT" },
    });
    expect(await store.read("upload_key_01")).toEqual({
      ok: true,
      value: null,
    });
  });

  it("closes the bound partition before successful lifecycle deletion", async () => {
    const memory = new MemoryIndexedDbFactory();
    const runtime = createIndexedDbResumableUploadCheckpointRuntime({
      scope,
      factory: deletingFactory(memory, "SUCCESS"),
      blockedTimeoutMs: 10,
    });
    expect(
      await runtime.store.compareAndSwap({
        expectedRevision: null,
        checkpoint: checkpoint(1),
      }),
    ).toMatchObject({ ok: true });
    expect(await runtime.admin.deletePartition()).toEqual({
      ok: true,
      value: { state: "DELETED" },
    });
    expect(await runtime.store.read("upload_key_01")).toMatchObject({
      ok: false,
      error: { code: "UNAVAILABLE", recovery: "RESUME" },
    });
  });

  it("bounds a partition deletion blocked by another browser context", async () => {
    const memory = new MemoryIndexedDbFactory();
    const runtime = createIndexedDbResumableUploadCheckpointRuntime({
      scope,
      factory: deletingFactory(memory, "BLOCKED"),
      blockedTimeoutMs: 1,
    });
    expect(await runtime.admin.deletePartition()).toMatchObject({
      ok: false,
      error: {
        code: "BLOCKED",
        retryable: true,
        recovery: "RELOAD_OTHER_CONTEXTS",
      },
    });
  });

  it("never reports a false abort after irreversible deleteDatabase dispatch", async () => {
    const memory = new MemoryIndexedDbFactory();
    const runtime = createIndexedDbResumableUploadCheckpointRuntime({
      scope,
      factory: deletingFactory(memory, "SUCCESS"),
    });
    const controller = new AbortController();
    const deletion = runtime.admin.deletePartition(controller.signal);
    controller.abort();
    expect(await deletion).toEqual({
      ok: true,
      value: { state: "DELETED" },
    });

    const preAborted = new AbortController();
    preAborted.abort();
    const second = createIndexedDbResumableUploadCheckpointRuntime({
      scope: { ...scope, partitionToken: "partition_token_02" },
      factory: deletingFactory(new MemoryIndexedDbFactory(), "SUCCESS"),
    });
    expect(
      await second.admin.deletePartition(preAborted.signal),
    ).toMatchObject({
      ok: false,
      error: { code: "ABORTED" },
    });
  });
});