import "fake-indexeddb/auto";
import { describe, expect, it } from "vitest";
import { createServerClient, type ProseMirrorDoc, type Character, type StorageAdapter, type WorldItem } from "@pubscript/core";
import { storageLocal } from "@pubscript/core/local";

const doc = (text: string): ProseMirrorDoc => ({ type: "doc", content: [{ type: "text", text }] });

/**
 * A minimal in-memory REST mock implementing exactly the endpoints the
 * `StorageAdapter` scenario exercises. This lets us run the *server* adapter
 * in Node without a live server, and compare it against the *local* adapter.
 */
function mockServerFetch(): typeof fetch {
  const projects = new Map<string, any>();
  const chapters = new Map<string, any>();
  const entities = new Map<string, any>();
  const boards = new Map<string, any>();
  const sessions = new Map<string, any>();
  let n = 0;
  const id = () => `id-${++n}`;

  const handler = async (url: string, init?: RequestInit): Promise<Response> => {
    const u = new URL(url);
    const method = (init?.method ?? "GET").toUpperCase();
    const body = init?.body ? (JSON.parse(init.body as string) as any) : undefined;
    const json = (data: unknown, status = 200) =>
      new Response(JSON.stringify(data), { status, headers: { "content-type": "application/json" } });

    if (method === "POST" && u.pathname === "/api/projects") {
      const p = {
        id: id(), projectId: "", title: body.title, ownerId: "u1", sharedWith: [],
        settings: body.settings ?? {}, cover: body.cover ?? { color: "#000" }, createdAt: "t", updatedAt: "t",
      };
      p.projectId = p.id;
      projects.set(p.id, p);
      return json({ project: p });
    }
    if (method === "GET" && u.pathname === "/api/projects") return json({ projects: [...projects.values()] });

    let m = u.pathname.match(/^\/api\/projects\/([^/]+)$/);
    if (method === "GET" && m) {
      const p = projects.get(m[1]!);
      return p ? json({ project: p }) : json({ error: "not_found" }, 404);
    }

    m = u.pathname.match(/^\/api\/chapters\/([^/]+)\/autosave$/);
    if (method === "POST" && m) {
      const existing = chapters.get(m[1]!);
      const rev = (existing?.rev ?? 0) + 1;
      const ch = { id: m[1]!, projectId: "proj", title: "Untitled", doc: body.doc, rev, meta: { wordCount: body.wordCount, scenes: 0, updatedAt: "t" } };
      chapters.set(m[1]!, ch);
      return json({ chapter: ch, rev });
    }
    m = u.pathname.match(/^\/api\/chapters\/([^/]+)$/);
    if (method === "GET" && m) {
      const ch = chapters.get(m[1]!);
      return ch ? json({ chapter: ch }) : json({ error: "not_found" }, 404);
    }

    m = u.pathname.match(/^\/api\/projects\/([^/]+)\/entities$/);
    if (method === "POST" && m) {
      const e = { id: body.id ?? id(), projectId: m[1]!, ...body };
      entities.set(`${m[1]!}|${body.kind}|${e.id}`, e);
      return json({ entity: e });
    }
    if (method === "GET" && m) {
      const projectId = m[1]!;
      const kind = u.searchParams.get("kind");
      const q = u.searchParams.get("q") ?? "";
      const all = [...entities.values()].filter((e) => e.projectId === projectId && (!kind || e.kind === kind));
      const filtered = q
        ? all.filter((e) => JSON.stringify(e).toLowerCase().includes(q.toLowerCase()))
        : all;
      return json({ entities: filtered });
    }
    m = u.pathname.match(/^\/api\/projects\/([^/]+)\/entities\/([^/]+)\/([^/]+)$/);
    if (method === "GET" && m) {
      const projectId = m[1]!;
      const kind = m[2]!;
      const id = m[3]!;
      const e = entities.get(`${projectId}|${kind}|${id}`);
      return e ? json({ entity: e }) : json({ error: "not_found" }, 404);
    }
    if (method === "DELETE" && m) {
      const projectId = m[1]!;
      const kind = m[2]!;
      const id = m[3]!;
      entities.delete(`${projectId}|${kind}|${id}`);
      return json({ ok: true });
    }
    m = u.pathname.match(/^\/api\/projects\/([^/]+)\/boards$/);
    if (method === "POST" && m) {
      const b = { id: body.id ?? id(), projectId: m[1]!, nodes: body.nodes ?? [], edges: body.edges ?? [] };
      boards.set(b.id, b);
      return json({ board: b });
    }
    m = u.pathname.match(/^\/api\/projects\/([^/]+)\/ai\/sessions$/);
    if (method === "POST" && m) {
      const now = new Date().toISOString();
      const s = { id: body.id ?? id(), projectId: m[1]!, title: body.title ?? "", kind: body.kind ?? "session", messages: body.messages ?? [], suggestions: body.suggestions ?? [], notes: body.notes ?? [], createdAt: body.createdAt ?? now, updatedAt: body.updatedAt ?? now, lastMessageAt: body.lastMessageAt ?? null };
      sessions.set(s.id, s);
      return json({ session: s });
    }
    return json({ error: "not_found" }, 404);
  };

  return (async (input: string | URL | Request, init?: RequestInit) =>
    handler(typeof input === "string" ? input : input.toString(), init)) as unknown as typeof fetch;
}

/** The shared scenario both adapters must pass identically. */
async function runScenario(adapter: StorageAdapter) {
  const project = await adapter.createProject({ title: "Test Novel" });
  const fetched = await adapter.getProject(project.id);
  const list = await adapter.listProjects();

  const docId = "doc-1";
  await adapter.saveDocument({ id: docId, projectId: project.id, title: "Chapter 1", doc: doc("Hello world"), rev: 0 });
  const chapter = await adapter.getChapter(docId);
  const chapterText =
    chapter && "content" in (chapter.doc as object)
      ? ((chapter.doc as { content?: Array<{ text?: string }> }).content?.[0]?.text)
      : undefined;

  await adapter.saveEntity({
    id: "char-1", projectId: project.id, name: "Ada", role: "protagonist", bio: "x",
    appearance: "", voice: "", relationships: [], arc: "", status: "active", tags: [],
  });
  await adapter.saveBoard({
    id: "board-1", projectId: project.id,
    nodes: [{ id: "n1", type: "character", position: { x: 0, y: 0 }, data: { refId: "char-1" } }],
    edges: [],
  });
  await adapter.saveAISession({
    id: "sess-1", projectId: project.id, title: "Session", kind: "session",
    messages: [], suggestions: [], notes: [], createdAt: new Date().toISOString(), updatedAt: new Date().toISOString(), lastMessageAt: null,
  });

  const unsub = adapter.onEvent(() => {});
  expect(typeof unsub).toBe("function");
  unsub();

  return {
    title: project.title,
    hasId: typeof project.id === "string" && project.id.length > 0,
    fetchedTitle: fetched.title,
    listed: list.some((p) => p.title === "Test Novel"),
    chapterText,
    chapterRev: chapter?.rev,
  };
}

const EXPECTED = {
  title: "Test Novel",
  hasId: true,
  fetchedTitle: "Test Novel",
  listed: true,
  chapterText: "Hello world",
  chapterRev: 1,
};

/** Entity CRUD + search scenario both adapters must pass identically. */
async function entityScenario(adapter: StorageAdapter) {
  const projectId = "proj-ent";
  await adapter.createProject({ title: "Entities" });

  const ada: Character = {
    id: "ada",
    projectId,
    name: "Ada Lovelace",
    role: "protagonist",
    bio: "A mathematician and first computer programmer.",
    appearance: "sharp eyes, Victorian dress",
    voice: "precise, confident",
    relationships: [{ targetId: "babbage", kind: "ally", note: "worked together" }],
    arc: "From curiosity to genius.",
    status: "active",
    tags: ["math", "victorian"],
  };
  const babbage: Character = {
    id: "babbage",
    projectId,
    name: "Charles Babbage",
    role: "mentor",
    bio: "An obsessed inventor of computing machines.",
    appearance: "bearded, bespectacled",
    voice: "grumbly",
    relationships: [],
    arc: "",
    status: "active",
    tags: ["inventor"],
  };
  const clocktower: WorldItem = {
    id: "clocktower",
    projectId,
    kind: "location",
    name: "The Clocktower",
    fields: { era: "1840s", significance: "meeting place" },
  };

  await adapter.saveEntity(ada);
  await adapter.saveEntity(babbage);
  await adapter.saveEntity(clocktower);

  // list all
  const all = await adapter.listEntities(projectId);
  expect(all.map((e) => e.id).sort()).toEqual(["ada", "babbage", "clocktower"]);

  // list by kind
  const chars = await adapter.listEntities(projectId, "character");
  expect(chars.map((e) => e.id).sort()).toEqual(["ada", "babbage"]);

  // getEntity: found
  expect(((await adapter.getEntity(projectId, "character", "ada")) as Character | null)?.name).toBe("Ada Lovelace");

  // getEntity: not found
  expect(await adapter.getEntity(projectId, "character", "nope")).toBeNull();

  // search: fuzzy match, best-first
  const babbageRes = await adapter.searchEntities(projectId, "babbage");
  expect(babbageRes.map((e) => e.id)).toContain("babbage");
  const adaRes = await adapter.searchEntities(projectId, "ada");
  expect(adaRes[0]?.id).toBe("ada");

  // search: empty returns all
  expect((await adapter.searchEntities(projectId, "")).length).toBe(3);

  // delete
  await adapter.deleteEntity(projectId, "character", "ada");
  expect(await adapter.getEntity(projectId, "character", "ada")).toBeNull();
  expect((await adapter.listEntities(projectId)).map((e) => e.id)).toEqual(["babbage", "clocktower"]);
}

describe.each([
  { name: "local (IndexedDB)", adapter: storageLocal },
  { name: "server (REST)", adapter: createServerClient({ baseUrl: "http://test", fetch: mockServerFetch() }) },
])("$name adapter honors the entity contract", async ({ adapter }) => {
  it("lists, fetches, searches, and deletes entities", () => entityScenario(adapter));
});

describe("StorageAdapter contract (web/local vs server)", () => {
  it("local (IndexedDB) adapter honors the contract", async () => {
    await expect(runScenario(storageLocal)).resolves.toMatchObject(EXPECTED);
  });

  it("server (REST) adapter honors the contract", async () => {
    const client = createServerClient({ baseUrl: "http://test", fetch: mockServerFetch() });
    await expect(runScenario(client)).resolves.toMatchObject(EXPECTED);
  });
});