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

import * as db from "./offlineStore";
import type { NoteMeta, Notebook } from "./types";

const note = (id: string, over: Partial<NoteMeta> = {}): NoteMeta => ({
  id,
  title: `Note ${id}`,
  folderId: "nb1",
  starred: false,
  trashed: false,
  createdAt: "2026-01-01T00:00:00.000Z",
  updatedAt: "2026-01-01T00:00:00.000Z",
  ...over,
});

const notebook = (id: string, sortOrder = 0): Notebook => ({ id, name: `NB ${id}`, cover: 0, sortOrder });

beforeEach(async () => {
  await db.clearAll();
});

describe("notes", () => {
  it("stores and reads back a note", async () => {
    await db.putNote(note("a"));
    expect(await db.getNote("a")).toMatchObject({ id: "a", title: "Note a" });
  });

  it("returns undefined for a note that does not exist", async () => {
    expect(await db.getNote("nope")).toBeUndefined();
  });

  it("writes a batch in one transaction", async () => {
    await db.putNotes([note("a"), note("b"), note("c")]);
    expect((await db.getAllNotes()).length).toBe(3);
  });

  it("deleting a note also drops its body, leaving nothing orphaned", async () => {
    await db.putNote(note("a"));
    await db.putNoteContent("a", "content", null);
    await db.deleteNote("a");
    expect(await db.getNote("a")).toBeUndefined();
    expect(await db.getNoteContent("a")).toBeUndefined();
  });
});

describe("note content", () => {
  it("keeps content, drawing and revision together", async () => {
    const strokes = {
      v: 1,
      w: 1200,
      h: 1600,
      strokes: [{ t: "pen" as const, c: "#fff", s: 5, p: [0, 0, 1, 1] }],
    };
    await db.putNoteContent("a", "body", null, strokes, "2026-02-02T00:00:00.000Z");
    const got = await db.getNoteContent("a");
    expect(got?.content).toBe("body");
    expect(got?.drawingStrokes?.strokes.length).toBe(1);
    expect(got?.updatedAt).toBe("2026-02-02T00:00:00.000Z");
  });

  it("defaults the drawing fields rather than leaving them undefined", async () => {
    await db.putNoteContent("a", "body", null);
    const got = await db.getNoteContent("a");
    expect(got?.drawingStrokes).toBeNull();
    expect(got?.updatedAt).toBeNull();
  });

  it("overwrites an existing body", async () => {
    await db.putNoteContent("a", "first", null);
    await db.putNoteContent("a", "second", null);
    expect((await db.getNoteContent("a"))?.content).toBe("second");
  });
});

describe("notebooks", () => {
  it("returns notebooks in sort order, not insertion order", async () => {
    await db.putNotebooks([notebook("c", 2), notebook("a", 0), notebook("b", 1)]);
    expect((await db.getAllNotebooks()).map((n) => n.id)).toEqual(["a", "b", "c"]);
  });
});

describe("sync queue", () => {
  it("preserves insertion order", async () => {
    await db.enqueue({ action: "first", data: {} });
    await db.enqueue({ action: "second", data: {} });
    expect((await db.peekQueue()).map((e) => e.action)).toEqual(["first", "second"]);
  });

  it("counts what is waiting", async () => {
    await db.enqueue({ action: "a", data: {} });
    await db.enqueue({ action: "b", data: {} });
    expect(await db.getQueueSize()).toBe(2);
  });

  it("removes only the dequeued entry", async () => {
    await db.enqueue({ action: "keep", data: {} });
    await db.enqueue({ action: "drop", data: {} });
    const [, second] = await db.peekQueue();
    await db.dequeue(second!.queueId);
    expect((await db.peekQueue()).map((e) => e.action)).toEqual(["keep"]);
  });

  it("records a failed attempt without losing the entry — the bug that silently ate offline edits", async () => {
    await db.enqueue({ action: "updateNote", data: { id: "a" } });
    const [entry] = await db.peekQueue();
    await db.updateQueueEntry(entry!.queueId, { attempts: 1, lastError: "boom" });

    const [updated] = await db.peekQueue();
    expect(updated!.attempts).toBe(1);
    expect(updated!.lastError).toBe("boom");
    expect(updated!.action).toBe("updateNote");
    expect(updated!.data).toEqual({ id: "a" });
  });

  it("ignores an update for an entry that is already gone", async () => {
    await expect(db.updateQueueEntry(9999, { attempts: 1 })).resolves.toBeUndefined();
  });
});

describe("attachments", () => {
  /* jsdom's Blob is a stub without `arrayBuffer`, and fake-indexeddb's
   * structured clone flattens it to `{}` — so real Blob fidelity cannot be
   * asserted here. A byte array clones faithfully and still exercises the
   * store's own logic; that images survive a round trip through a real browser
   * is covered by the end-to-end suite instead. */
  it("round-trips binary payloads", async () => {
    const bytes = new Uint8Array([1, 2, 3, 250]);
    await db.putAttachmentBlob("att1", bytes as unknown as Blob);
    const got = (await db.getAttachmentBlob("att1")) as unknown as Uint8Array;
    expect(got).not.toBeNull();
    expect(Array.from(got)).toEqual([1, 2, 3, 250]);
  });

  it("returns null for an attachment that was never cached", async () => {
    expect(await db.getAttachmentBlob("missing")).toBeNull();
  });
});

describe("meta", () => {
  it("stores arbitrary values", async () => {
    await db.setMeta("user", { id: "u1", username: "marc" });
    expect(await db.getMeta("user")).toEqual({ id: "u1", username: "marc" });
  });

  it("returns null for an unset key", async () => {
    expect(await db.getMeta("nothing")).toBeNull();
  });

  it("deletes a key", async () => {
    await db.setMeta("token", "abc");
    await db.deleteMeta("token");
    expect(await db.getMeta("token")).toBeNull();
  });
});

describe("clearAll", () => {
  it("wipes every store, as logout must", async () => {
    await db.putNote(note("a"));
    await db.putNoteContent("a", "body", null);
    await db.putNotebook(notebook("nb1"));
    await db.enqueue({ action: "x", data: {} });
    await db.setMeta("token", "abc");
    await db.putAttachmentBlob("att", new Blob(["x"]));

    await db.clearAll();

    expect(await db.getAllNotes()).toEqual([]);
    expect(await db.getNoteContent("a")).toBeUndefined();
    expect(await db.getAllNotebooks()).toEqual([]);
    expect(await db.getQueueSize()).toBe(0);
    expect(await db.getMeta("token")).toBeNull();
    expect(await db.getAttachmentBlob("att")).toBeNull();
  });
});