import { mkdtempSync, mkdirSync, realpathSync, rmSync, symlinkSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { searchHomeDirectories, searchWorkspaceEntries } from "./directory-suggestions.js";

const isWindows = process.platform === "win32";

describe("searchHomeDirectories", () => {
  let tempRoot: string;
  let homeDir: string;
  let outsideDir: string;

  beforeEach(() => {
    tempRoot = realpathSync(mkdtempSync(path.join(tmpdir(), "directory-suggestions-")));
    homeDir = path.join(tempRoot, "home");
    outsideDir = path.join(tempRoot, "outside");

    mkdirSync(homeDir, { recursive: true });
    mkdirSync(outsideDir, { recursive: true });

    mkdirSync(path.join(homeDir, "projects", "paseo"), { recursive: true });
    mkdirSync(path.join(homeDir, "projects", "playground"), { recursive: true });
    mkdirSync(path.join(homeDir, "documents", "plans"), { recursive: true });
    mkdirSync(path.join(homeDir, ".hidden", "cache"), { recursive: true });
    writeFileSync(path.join(homeDir, "projects", "README.md"), "not a directory\n");

    mkdirSync(path.join(outsideDir, "outside-match"), { recursive: true });
    symlinkSync(path.join(outsideDir, "outside-match"), path.join(homeDir, "outside-link"));
  });

  afterEach(() => {
    rmSync(tempRoot, { recursive: true, force: true });
  });

  it("returns an empty list for blank queries", async () => {
    await expect(
      searchHomeDirectories({
        homeDir,
        query: "   ",
        limit: 10,
      }),
    ).resolves.toEqual([]);
  });

  it("returns only existing directories", async () => {
    const results = await searchHomeDirectories({
      homeDir,
      query: "proj",
      limit: 10,
    });

    expect(results).toContain(path.join(homeDir, "projects"));
    expect(results).toContain(path.join(homeDir, "projects", "paseo"));
    expect(results).not.toContain(path.join(homeDir, "projects", "README.md"));
  });

  it("supports home-relative path query syntax", async () => {
    const results = await searchHomeDirectories({
      homeDir,
      query: "~/projects/pa",
      limit: 10,
    });

    expect(results).toEqual([path.join(homeDir, "projects", "paseo")]);
  });

  it("prioritizes exact segment matches before segment-prefix matches", async () => {
    const exactSegmentPath = path.join(homeDir, "something", "faro", "something-else");
    const prefixSegmentPath = path.join(homeDir, "something", "somethingelse", "faro-bla");
    mkdirSync(exactSegmentPath, { recursive: true });
    mkdirSync(prefixSegmentPath, { recursive: true });

    const results = await searchHomeDirectories({
      homeDir,
      query: "faro",
      limit: 30,
    });

    const exactIndex = results.indexOf(exactSegmentPath);
    const prefixIndex = results.indexOf(prefixSegmentPath);
    expect(exactIndex).toBeGreaterThanOrEqual(0);
    expect(prefixIndex).toBeGreaterThanOrEqual(0);
    expect(exactIndex).toBeLessThan(prefixIndex);
  });

  it("prioritizes partial matches that appear earlier in the path", async () => {
    const earlierPath = path.join(homeDir, "farofoo");
    const laterPath = path.join(homeDir, "x", "y", "farofoo");
    mkdirSync(earlierPath, { recursive: true });
    mkdirSync(laterPath, { recursive: true });

    const results = await searchHomeDirectories({
      homeDir,
      query: "arofo",
      limit: 30,
    });

    const earlierIndex = results.indexOf(earlierPath);
    const laterIndex = results.indexOf(laterPath);
    expect(earlierIndex).toBeGreaterThanOrEqual(0);
    expect(laterIndex).toBeGreaterThanOrEqual(0);
    expect(earlierIndex).toBeLessThan(laterIndex);
  });

  it.skipIf(isWindows)("returns home-root suggestions when query is '~'", async () => {
    const results = await searchHomeDirectories({
      homeDir,
      query: "~",
      limit: 20,
    });

    expect(results).toContain(path.join(homeDir, "projects"));
    expect(results).toContain(path.join(homeDir, "documents"));
    expect(results).not.toContain(path.join(homeDir, ".hidden"));
  });

  it("does not return hidden directories during tree search", async () => {
    const results = await searchHomeDirectories({
      homeDir,
      query: "cache",
      limit: 20,
    });

    expect(results).not.toContain(path.join(homeDir, ".hidden", "cache"));
  });

  it("does not return paths that escape home through symlinks", async () => {
    const results = await searchHomeDirectories({
      homeDir,
      query: "outside",
      limit: 20,
    });

    expect(results).not.toContain(path.join(homeDir, "outside-link"));
    expect(results).not.toContain(path.join(outsideDir, "outside-match"));
  });

  it("respects the result limit", async () => {
    const results = await searchHomeDirectories({
      homeDir,
      query: "p",
      limit: 1,
    });

    expect(results).toHaveLength(1);
  });
});

describe("searchWorkspaceEntries", () => {
  let tempRoot: string;
  let workspaceDir: string;
  let outsideDir: string;

  beforeEach(() => {
    tempRoot = realpathSync(mkdtempSync(path.join(tmpdir(), "workspace-suggestions-")));
    workspaceDir = path.join(tempRoot, "workspace");
    outsideDir = path.join(tempRoot, "outside");

    mkdirSync(path.join(workspaceDir, "src", "components"), {
      recursive: true,
    });
    mkdirSync(path.join(workspaceDir, "docs"), { recursive: true });
    mkdirSync(path.join(outsideDir, "escaped"), { recursive: true });

    writeFileSync(path.join(workspaceDir, "README.md"), "# paseo\n");
    writeFileSync(
      path.join(workspaceDir, "src", "components", "chat-input.tsx"),
      "export const ChatInput = null;\n",
    );
    writeFileSync(path.join(workspaceDir, "docs", "notes.md"), "notes\n");

    symlinkSync(path.join(outsideDir, "escaped"), path.join(workspaceDir, "escaped-link"));
  });

  afterEach(() => {
    rmSync(tempRoot, { recursive: true, force: true });
  });

  it("returns relative file and directory suggestions for workspace queries", async () => {
    const results = await searchWorkspaceEntries({
      cwd: workspaceDir,
      query: "chat",
      limit: 20,
      includeFiles: true,
      includeDirectories: true,
    });

    expect(results).toContainEqual({
      path: "src/components/chat-input.tsx",
      kind: "file",
    });
    expect(results.some((entry) => entry.path === path.join(workspaceDir, "src"))).toBe(false);
  });

  it("filters entries by kind", async () => {
    const dirsOnly = await searchWorkspaceEntries({
      cwd: workspaceDir,
      query: "src",
      limit: 20,
      includeFiles: false,
      includeDirectories: true,
    });
    expect(dirsOnly.some((entry) => entry.kind === "file")).toBe(false);
    expect(dirsOnly.some((entry) => entry.path === "src")).toBe(true);

    const filesOnly = await searchWorkspaceEntries({
      cwd: workspaceDir,
      query: "readme",
      limit: 20,
      includeFiles: true,
      includeDirectories: false,
    });
    expect(filesOnly).toEqual([{ path: "README.md", kind: "file" }]);
  });

  it("supports path-style queries and does not escape cwd through symlinks", async () => {
    const pathResults = await searchWorkspaceEntries({
      cwd: workspaceDir,
      query: "src/co",
      limit: 20,
      includeFiles: true,
      includeDirectories: true,
    });
    expect(pathResults).toContainEqual({
      path: "src/components",
      kind: "directory",
    });

    const escapedResults = await searchWorkspaceEntries({
      cwd: workspaceDir,
      query: "escaped",
      limit: 20,
      includeFiles: true,
      includeDirectories: true,
    });
    expect(escapedResults.some((entry) => entry.path.includes("escaped-link"))).toBe(false);
  });

  it("ignores node_modules entries so deep workspace files still resolve under scan limits", async () => {
    mkdirSync(path.join(workspaceDir, "packages", "app", "src", "app"), { recursive: true });
    writeFileSync(path.join(workspaceDir, "packages", "app", "src", "app", "_layout.tsx"), "");

    for (let index = 0; index < 120; index += 1) {
      mkdirSync(path.join(workspaceDir, "node_modules", `pkg-${index}`), { recursive: true });
      writeFileSync(
        path.join(workspaceDir, "node_modules", `pkg-${index}`, "index.js"),
        "module.exports = {};\n",
      );
    }
    writeFileSync(path.join(workspaceDir, "node_modules", "_layout.tsx"), "");

    const results = await searchWorkspaceEntries({
      cwd: workspaceDir,
      query: "_layout.tsx",
      limit: 20,
      includeFiles: true,
      includeDirectories: true,
      maxEntriesScanned: 60,
    });

    expect(results).toContainEqual({
      path: "packages/app/src/app/_layout.tsx",
      kind: "file",
    });
    expect(results.some((entry) => entry.path.startsWith("node_modules/"))).toBe(false);
  });
});