import { beforeEach, describe, expect, it } from "vitest";
import {
  type CommentInput,
  countCommentsByStatus,
  createComment,
  deleteComment,
  listApprovedComments,
  listCommentsForAdmin,
  setCommentStatus,
} from "@/lib/services/comments";
import { createPost, type PostInput } from "@/lib/services/posts";
import { resetDb } from "../helpers/db";

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

const commentInput = (
  postId: number,
  overrides: Partial<CommentInput> = {},
): CommentInput => ({
  postId,
  parentId: null,
  authorName: "Alice",
  authorEmail: "alice@example.com",
  emailPublic: false,
  body: "Nice post!",
  ...overrides,
});

beforeEach(resetDb);

describe("comment moderation", () => {
  it("stores new comments as pending and hides them publicly", async () => {
    const post = await createPost(postInput());
    const result = await createComment(commentInput(post.id));
    expect(result.ok).toBe(true);

    expect(await listApprovedComments(post.id)).toEqual([]);
    const counts = await countCommentsByStatus();
    expect(counts).toEqual({ pending: 1, approved: 0 });
  });

  it("shows comments publicly only after approval", async () => {
    const post = await createPost(postInput());
    const created = await createComment(commentInput(post.id));
    if (!created.ok) throw new Error("expected ok");

    await setCommentStatus(created.comment.id, "approved");
    const visible = await listApprovedComments(post.id);
    expect(visible).toHaveLength(1);
    expect(visible[0].authorName).toBe("Alice");
  });

  it("rejects comments on drafts and unknown posts", async () => {
    const draft = await createPost(postInput({ status: "draft" }));
    expect((await createComment(commentInput(draft.id))).ok).toBe(false);
    expect((await createComment(commentInput(999_999))).ok).toBe(false);
  });

  it("hides private emails and shows public ones", async () => {
    const post = await createPost(postInput());
    const priv = await createComment(commentInput(post.id));
    const pub = await createComment(
      commentInput(post.id, { authorName: "Bob", authorEmail: "bob@example.com", emailPublic: true }),
    );
    if (!priv.ok || !pub.ok) throw new Error("expected ok");
    await setCommentStatus(priv.comment.id, "approved");
    await setCommentStatus(pub.comment.id, "approved");

    const visible = await listApprovedComments(post.id);
    expect(visible.find((c) => c.authorName === "Alice")?.authorEmail).toBeNull();
    expect(visible.find((c) => c.authorName === "Bob")?.authorEmail).toBe("bob@example.com");

    // The admin list always carries the address.
    const admin = await listCommentsForAdmin();
    expect(admin.map((c) => c.authorEmail).sort()).toEqual([
      "alice@example.com",
      "bob@example.com",
    ]);
  });
});

describe("threading", () => {
  it("only allows replies to approved comments on the same post", async () => {
    const post = await createPost(postInput());
    const other = await createPost(postInput());
    const parent = await createComment(commentInput(post.id));
    if (!parent.ok) throw new Error("expected ok");

    // Parent still pending → no replies.
    const early = await createComment(
      commentInput(post.id, { parentId: parent.comment.id, body: "too early" }),
    );
    expect(early.ok).toBe(false);

    await setCommentStatus(parent.comment.id, "approved");
    const reply = await createComment(
      commentInput(post.id, { parentId: parent.comment.id, authorName: "Bob", body: "A reply" }),
    );
    expect(reply.ok).toBe(true);

    // Approved parent, but wrong post.
    const crossPost = await createComment(
      commentInput(other.id, { parentId: parent.comment.id }),
    );
    expect(crossPost.ok).toBe(false);
  });

  it("builds a nested tree and hides replies under pending parents", async () => {
    const post = await createPost(postInput());
    const a = await createComment(commentInput(post.id, { body: "root A" }));
    if (!a.ok) throw new Error();
    await setCommentStatus(a.comment.id, "approved");
    const b = await createComment(
      commentInput(post.id, { parentId: a.comment.id, authorName: "Bob", body: "reply B" }),
    );
    if (!b.ok) throw new Error();
    await setCommentStatus(b.comment.id, "approved");
    const c = await createComment(
      commentInput(post.id, { parentId: b.comment.id, authorName: "Cleo", body: "reply C" }),
    );
    if (!c.ok) throw new Error();

    // C not yet approved → depth-2 tree shows A > B only.
    let tree = await listApprovedComments(post.id);
    expect(tree).toHaveLength(1);
    expect(tree[0].replies).toHaveLength(1);
    expect(tree[0].replies[0].replies).toHaveLength(0);

    // Approve C → full chain visible.
    await setCommentStatus(c.comment.id, "approved");
    tree = await listApprovedComments(post.id);
    expect(tree[0].replies[0].replies[0].body).toBe("reply C");

    // Unapprove B → C disappears with it (thread context preserved).
    await setCommentStatus(b.comment.id, "pending");
    tree = await listApprovedComments(post.id);
    expect(tree[0].replies).toHaveLength(0);
  });

  it("deleting a comment removes its whole subtree", async () => {
    const post = await createPost(postInput());
    const a = await createComment(commentInput(post.id));
    if (!a.ok) throw new Error();
    await setCommentStatus(a.comment.id, "approved");
    const b = await createComment(commentInput(post.id, { parentId: a.comment.id }));
    if (!b.ok) throw new Error();

    await deleteComment(a.comment.id);
    const counts = await countCommentsByStatus();
    expect(counts).toEqual({ pending: 0, approved: 0 });
  });
});