// @vitest-environment happy-dom
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";

import { createSpawnForm, type SpawnFormHandle } from "./spawnForm.js";
import type { Project } from "./types.js";

const NOW = "2026-08-23T12:00:00Z";

function project(overrides: Partial<Project>): Project {
  return {
    path: `/home/user/${overrides.name ?? "proj"}`,
    name: "proj",
    is_worktree: false,
    ...overrides,
  };
}

/** Three fetches gate the form's initial load: /api/info, /api/projects, and
 * the /api/names batch (#53). */
function stubFetch(info: unknown, projects: Project[]): void {
  vi.stubGlobal(
    "fetch",
    vi.fn(async (input: RequestInfo | URL) => {
      const url = String(input);
      const body = url.includes("/api/info")
        ? info
        : url.includes("/api/projects")
          ? projects
          : url.includes("/api/names")
            ? { names: ["allegro-cello", "presto-fugue", "adagio-lyre"] }
            : undefined;
      return new Response(JSON.stringify(body), { status: 200 });
    }),
  );
}

function rowPaths(form: HTMLFormElement): string[] {
  return [...form.querySelectorAll<HTMLButtonElement>(".project-row:not(.project-other)")].map(
    (r) => r.dataset.cwd ?? "",
  );
}

describe("spawnForm project picker", () => {
  let handle: SpawnFormHandle | null = null;

  beforeEach(() => {
    vi.useFakeTimers({ now: Date.parse(NOW) });
  });

  afterEach(() => {
    handle?.destroy();
    handle = null;
    vi.unstubAllGlobals();
    vi.useRealTimers();
  });

  async function mount(projects: Project[], seed?: Parameters<typeof createSpawnForm>[0]["seed"]) {
    stubFetch({ hostname: "h", version: "0", home_dir: "/home/user", presets: [] }, projects);
    handle = createSpawnForm({
      seed,
      onSuccess() {},
    });
    document.body.appendChild(handle.el);
    for (let i = 0; i < 20; i++) await Promise.resolve();
    return handle;
  }

  it("renders one row per project, fresh before stale", async () => {
    const fresh = project({ name: "fresh", path: "/home/user/fresh", last_activity: NOW });
    const stale = project({
      name: "stale",
      path: "/home/user/stale",
      last_activity: "2026-01-01T00:00:00Z",
    });
    const form = (await mount([stale, fresh])).el;
    expect(rowPaths(form)).toEqual(["/home/user/fresh", "/home/user/stale"]);
    const rows = [...form.querySelectorAll<HTMLButtonElement>(".project-row")];
    expect(rows[1].classList.contains("is-stale")).toBe(true);
    expect(rows[0].classList.contains("is-stale")).toBe(false);
  });

  it("nests worktrees under their base repository", async () => {
    const main = project({ name: "maestro", path: "/home/user/maestro" });
    const wt = project({
      name: "wt",
      path: "/elsewhere/wt",
      is_worktree: true,
      base_repo: main.path,
    });
    const form = (await mount([wt, main])).el;
    expect(rowPaths(form)).toEqual(["/home/user/maestro", "/elsewhere/wt"]);
    const [mainRow, wtRow] = [
      ...form.querySelectorAll(".project-row:not(.project-other)"),
    ];
    expect(wtRow.classList.contains("is-worktree")).toBe(true);
    expect(mainRow.classList.contains("is-worktree")).toBe(false);
  });

  it("filters rows as the operator types", async () => {
    const a = project({ name: "maestro", path: "/home/user/maestro" });
    const b = project({ name: "tea", path: "/home/user/work/tea" });
    const form = (await mount([a, b])).el;
    const filter = form.querySelector<HTMLInputElement>(".project-filter")!;
    filter.value = "tea";
    filter.dispatchEvent(new Event("input"));
    expect(rowPaths(form)).toEqual(["/home/user/work/tea"]);
    filter.value = "zzz";
    filter.dispatchEvent(new Event("input"));
    expect(rowPaths(form)).toEqual([]);
    expect(form.querySelector(".picker-empty")).toBeTruthy();
  });

  it("picking a project selects its cwd and pre-selects its last command", async () => {
    const p = project({
      name: "maestro",
      path: "/home/user/maestro",
      last_command: "claude",
    });
    const onChange = vi.fn();
    stubFetch(
      {
        hostname: "h",
        version: "0",
        home_dir: "/home/user",
        presets: [
          { id: "claude", label: "Claude", command: "claude" },
          { id: "custom", label: "Custom…", command: "" },
        ],
      },
      [p],
    );
    handle = createSpawnForm({ onSuccess() {}, onChange });
    const form = handle.el;
    document.body.appendChild(form);
    for (let i = 0; i < 20; i++) await Promise.resolve();
    onChange.mockClear();

    const row = form.querySelector<HTMLButtonElement>(".project-row")!;
    row.click();

    const values = form.querySelector<HTMLInputElement>("input[name=name]")!.value;
    const last = onChange.mock.lastCall![0];
    expect(last.cwd).toBe("/home/user/maestro");
    expect(last.command).toBe("claude");
    expect(values).toBeTruthy();
    // The raw input stays hidden — the picked row is the source of truth.
    expect((form.querySelector(".cwd-raw-wrap") as HTMLElement).hidden).toBe(true);
    expect(row.classList.contains("is-active")).toBe(true);
  });

  it("keeps an 'Other directory…' escape hatch that reveals the raw input", async () => {
    const p = project({ name: "maestro", path: "/home/user/maestro" });
    const form = (await mount([p])).el;
    const other = form.querySelector<HTMLButtonElement>(".project-other")!;
    other.click();
    expect((form.querySelector(".cwd-raw-wrap") as HTMLElement).hidden).toBe(false);
  });

  it("falls back to the raw input when no projects exist", async () => {
    const form = (await mount([])).el;
    expect((form.querySelector(".cwd-raw-wrap") as HTMLElement).hidden).toBe(false);
    const raw = form.querySelector<HTMLInputElement>(".cwd-raw")!;
    expect(raw.value).toBe("/home/user");
  });
});