import { describe, expect, it } from "vitest";
import {
  buildCommentBodySegments,
  encodeMentionToken,
  extractMentionIds,
  filterMentionCandidates,
  findActiveMentionQuery,
  insertMentionToken,
  toDisplayText,
} from "@/domain/work-orders/utils/comment-mentions";

describe("comment-mentions", () => {
  it("encodes and extracts mention ids from tokens", () => {
    const token = encodeMentionToken("user-1", "Jane Doe");
    const text = `Please review ${token} today`;

    expect(text).toBe("Please review @[user-1:Jane Doe] today");
    expect(extractMentionIds(text)).toEqual(["user-1"]);
    expect(toDisplayText(text)).toBe("Please review @Jane Doe today");
  });

  it("builds highlight segments from encoded tokens", () => {
    const text = `Hi ${encodeMentionToken("42", "Alex Smith")}!`;

    expect(buildCommentBodySegments(text)).toEqual([
      { type: "text", value: "Hi " },
      { type: "mention", userId: "42", label: "Alex Smith" },
      { type: "text", value: "!" },
    ]);
  });

  it("highlights plain @names when response mentions are provided", () => {
    const text = "Ping @Jane Doe about this";

    expect(
      buildCommentBodySegments(text, ["user-1"], [{ id: "user-1", name: "Jane Doe" }]),
    ).toEqual([
      { type: "text", value: "Ping " },
      { type: "mention", userId: "Jane Doe", label: "Jane Doe" },
      { type: "text", value: " about this" },
    ]);
  });

  it("does not highlight casual @names from the full user roster without mentions", () => {
    const text = "See @Jane Doe later";

    expect(buildCommentBodySegments(text, undefined, [{ id: "user-1", name: "Jane Doe" }])).toEqual(
      [{ type: "text", value: "See @Jane Doe later" }],
    );
  });

  it("highlights plain @names before encoded tokens when mentioned", () => {
    const encoded = encodeMentionToken("2", "Bob");
    const text = `Hi @Jane Doe and ${encoded}`;

    expect(
      buildCommentBodySegments(
        text,
        ["user-1", "2"],
        [
          { id: "user-1", name: "Jane Doe" },
          { id: "2", name: "Bob" },
        ],
      ),
    ).toEqual([
      { type: "text", value: "Hi " },
      { type: "mention", userId: "Jane Doe", label: "Jane Doe" },
      { type: "text", value: " and " },
      { type: "mention", userId: "2", label: "Bob" },
    ]);
  });

  it("does not highlight shorter mention names as prefixes of longer @words", () => {
    const text = "Check @Annual maintenance with @Ann";

    expect(buildCommentBodySegments(text, ["user-ann"], [{ id: "user-ann", name: "Ann" }])).toEqual(
      [
        { type: "text", value: "Check @Annual maintenance with " },
        { type: "mention", userId: "Ann", label: "Ann" },
      ],
    );
  });

  it("finds active mention query at cursor", () => {
    const text = "Hello @ja";
    const query = findActiveMentionQuery(text, text.length);

    expect(query).toEqual({ start: 6, query: "ja" });
    expect(findActiveMentionQuery("email@test.com", 13)).toBeNull();
  });

  it("filters mention candidates by query", () => {
    const candidates = [
      { id: "1", name: "Jane Doe" },
      { id: "2", name: "John Smith" },
    ];

    expect(filterMentionCandidates(candidates, "jo")).toEqual([{ id: "2", name: "John Smith" }]);
  });

  it("inserts encoded mention token replacing active query", () => {
    const text = "Hello @ja";
    const activeQuery = findActiveMentionQuery(text, text.length);

    expect(activeQuery).not.toBeNull();
    if (!activeQuery) {
      return;
    }

    const { nextText, nextCursor } = insertMentionToken(text, activeQuery.start, text.length, {
      id: "1",
      name: "Jane Doe",
    });

    expect(nextText).toBe("Hello @[1:Jane Doe] ");
    expect(nextCursor).toBe(nextText.length);
  });
});