import { beforeEach, describe, expect, it } from "vitest";
import { db } from "@/db";
import { tags } from "@/db/schema";
import { verifyPassword } from "@/lib/auth/password";
import { buildSiteExport, importSiteExport } from "@/lib/services/import-export";
import { createPost, getPostById, listAllPosts, type PostInput } from "@/lib/services/posts";
import {
  createUser,
  deleteUser,
  getAllowedTagIds,
  getUserWithTags,
  listUsersWithTags,
  updateUser,
} from "@/lib/services/users";
import { resetDb } from "../helpers/db";

const postInput = (overrides: Partial<PostInput> = {}): PostInput => ({
  title: `Post ${Math.random().toString(36).slice(2, 8)}`,
  slug: "",
  body: "body",
  authorName: "Someone",
  featuredImageUrl: null,
  featuredImageAlt: null,
  status: "published",
  tagIds: [],
  newTagNames: [],
  ...overrides,
});

async function seedTags(...names: string[]) {
  return db
    .insert(tags)
    .values(names.map((name) => ({ name, slug: name.toLowerCase() })))
    .returning();
}

async function seedAdmin() {
  const [admin] = await db
    .insert((await import("@/db/schema")).users)
    .values({ username: "boss", passwordHash: "x", role: "admin" })
    .returning();
  return admin;
}

beforeEach(resetDb);

describe("account management", () => {
  it("creates author accounts with tag grants", async () => {
    const [design, writing] = await seedTags("Design", "Writing");
    const user = await createUser({
      username: "casey",
      password: "hunter2hunter2",
      tagIds: [design.id, writing.id],
    });
    expect(user.role).toBe("author");
    expect((await getAllowedTagIds(user.id)).sort()).toEqual(
      [design.id, writing.id].sort(),
    );

    const listed = await listUsersWithTags();
    expect(listed.find((u) => u.username === "casey")?.tags.map((t) => t.name).sort()).toEqual(
      ["Design", "Writing"],
    );
  });

  it("hashes passwords and updates them only when provided", async () => {
    const user = await createUser({ username: "casey", password: "first-password", tagIds: [] });
    const { users } = await import("@/db/schema");
    const { eq } = await import("drizzle-orm");
    const [row] = await db.select().from(users).where(eq(users.id, user.id));
    expect(row.passwordHash).not.toContain("first-password");
    expect(await verifyPassword(row.passwordHash, "first-password")).toBe(true);

    await updateUser(user.id, { password: null, tagIds: [] });
    const [same] = await db.select().from(users).where(eq(users.id, user.id));
    expect(same.passwordHash).toBe(row.passwordHash);

    await updateUser(user.id, { password: "second-password", tagIds: [] });
    const [changed] = await db.select().from(users).where(eq(users.id, user.id));
    expect(await verifyPassword(changed.passwordHash, "second-password")).toBe(true);
  });

  it("replaces tag grants on update", async () => {
    const [design, writing] = await seedTags("Design", "Writing");
    const user = await createUser({
      username: "casey",
      password: "hunter2hunter2",
      tagIds: [design.id],
    });
    await updateUser(user.id, { password: null, tagIds: [writing.id] });
    expect(await getAllowedTagIds(user.id)).toEqual([writing.id]);
  });

  it("refuses to delete the admin and keeps a deleted author's posts", async () => {
    const admin = await seedAdmin();
    expect((await deleteUser(admin.id)).ok).toBe(false);

    const author = await createUser({ username: "casey", password: "hunter2hunter2", tagIds: [] });
    const post = await createPost(postInput(), author.id);
    expect((await deleteUser(author.id)).ok).toBe(true);

    // Post survives, now unowned.
    const kept = await getPostById(post.id);
    expect(kept).not.toBeNull();
    expect(kept?.authorId).toBeNull();
    expect(await getUserWithTags(author.id)).toBeNull();
  });
});

describe("post ownership", () => {
  it("stamps the creating account and filters listAllPosts by author", async () => {
    const admin = await seedAdmin();
    const author = await createUser({ username: "casey", password: "hunter2hunter2", tagIds: [] });

    await createPost(postInput({ title: "Admin post" }), admin.id);
    await createPost(postInput({ title: "Casey post" }), author.id);

    const all = await listAllPosts();
    expect(all).toHaveLength(2);
    const mine = await listAllPosts({ authorId: author.id });
    expect(mine.map((p) => p.title)).toEqual(["Casey post"]);
  });

  it("round-trips ownership through export/import by username", async () => {
    await seedAdmin();
    const author = await createUser({ username: "casey", password: "hunter2hunter2", tagIds: [] });
    const post = await createPost(postInput({ title: "Owned" }), author.id);

    const snapshot = await buildSiteExport();
    expect(snapshot.posts.find((p) => p.slug === post.slug)?.authorUsername).toBe("casey");

    await importSiteExport(snapshot);
    const restored = (await listAllPosts({ authorId: author.id })).find(
      (p) => p.title === "Owned",
    );
    expect(restored).toBeDefined();
    expect(restored?.authorId).toBe(author.id);
  });

  it("leaves posts unowned when the export references an unknown username", async () => {
    await seedAdmin();
    const author = await createUser({ username: "casey", password: "hunter2hunter2", tagIds: [] });
    await createPost(postInput({ title: "Orphan-to-be" }), author.id);

    const snapshot = await buildSiteExport();
    await deleteUser(author.id);
    await importSiteExport(snapshot);

    const [post] = await listAllPosts();
    expect(post.authorId).toBeNull();
  });
});