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

import { closeSpawnModal, openSpawnModal } from "./spawnModal.js";
import type { Session } from "./types.js";

function stubFetch(): void {
  vi.stubGlobal(
    "fetch",
    vi.fn(async (input: RequestInfo | URL) => {
      const url = String(input);
      const body = url.includes("/api/info")
        ? { hostname: "h", version: "0", home_dir: "/home/user", presets: [] }
        : url.includes("/api/projects")
          ? []
          : url.includes("/api/names")
            ? { names: ["cello"] }
            : undefined;
      return new Response(JSON.stringify(body), { status: 200 });
    }),
  );
}

/** Drain the microtask queue so the form's initial loads land. */
async function flush(): Promise<void> {
  for (let i = 0; i < 20; i++) await Promise.resolve();
}

const modal = () => document.getElementById("modal-host");

describe("spawn modal", () => {
  beforeEach(() => {
    stubFetch();
    document.body.replaceChildren();
  });

  afterEach(() => {
    closeSpawnModal();
    vi.unstubAllGlobals();
  });

  it("mounts the shared spawn form inside a dialog", async () => {
    openSpawnModal({ onSuccess: () => {} });
    await flush();

    const host = modal()!;
    expect(host).toBeTruthy();
    expect(host.querySelector('[role="dialog"]')).toBeTruthy();
    expect(host.querySelector("form.spawn-form")).toBeTruthy();
    expect(host.querySelector("#spawn-title")?.textContent).toBe("Spawn session");
    // The modal adds the Cancel the shared form doesn't ship.
    expect(host.querySelector(".form-actions .cancel")).toBeTruthy();
  });

  it("opens with the project filter focused, harness before project", async () => {
    openSpawnModal({ onSuccess: () => {} });
    await flush();

    const form = modal()!.querySelector("form.spawn-form")!;
    expect(document.activeElement).toBe(form.querySelector(".project-filter"));
    const fields = [...form.querySelectorAll(".field .field-label")].map((el) => el.textContent);
    expect(fields.slice(0, 2)).toEqual(["Harness", "Project"]);
  });

  it("titles a seeded open as a clone", async () => {
    openSpawnModal({ seed: { command: "claude" }, onSuccess: () => {} });
    await flush();

    expect(modal()!.querySelector("#spawn-title")?.textContent).toBe("Spawn similar");
  });

  it("closes on Escape, on Cancel and on a backdrop click", async () => {
    for (const dismiss of [
      () => window.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape" })),
      () => (modal()!.querySelector(".form-actions .cancel") as HTMLButtonElement).click(),
      () => modal()!.dispatchEvent(new MouseEvent("click", { bubbles: true })),
      () => (modal()!.querySelector(".close") as HTMLButtonElement).click(),
    ]) {
      openSpawnModal({ onSuccess: () => {} });
      await flush();
      dismiss();
      expect(modal()).toBeNull();
    }
  });

  it("leaves no stray Escape handler behind after closing", async () => {
    openSpawnModal({ onSuccess: () => {} });
    await flush();
    closeSpawnModal();

    // A second Escape with no modal up must not throw on the torn-down form.
    window.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape" }));
    expect(modal()).toBeNull();
  });

  it("opening twice tears the first one down rather than stacking dialogs", async () => {
    openSpawnModal({ onSuccess: () => {} });
    await flush();
    openSpawnModal({ onSuccess: () => {} });
    await flush();

    expect(document.querySelectorAll("#modal-host")).toHaveLength(1);
    expect(document.querySelectorAll("form.spawn-form")).toHaveLength(1);
  });

  it("closes before handing the created session to its caller", async () => {
    const seen: Array<{ session: Session; stillOpen: boolean }> = [];
    vi.stubGlobal(
      "fetch",
      vi.fn(async (input: RequestInfo | URL, init?: RequestInit) => {
        const url = String(input);
        if (url.includes("/api/sessions") && init?.method === "POST") {
          return new Response(JSON.stringify({ id: "s1", cwd: "/x", command: "zsh" }), { status: 200 });
        }
        const body = url.includes("/api/info")
          ? { hostname: "h", version: "0", home_dir: "/home/user", presets: [] }
          : url.includes("/api/projects")
            ? []
            : url.includes("/api/names")
              ? { names: ["cello"] }
              : undefined;
        return new Response(JSON.stringify(body), { status: 200 });
      }),
    );

    openSpawnModal({
      // A plain, worktree-free spawn: the point here is where the created
      // session is handed over, not what the form validates.
      seed: { command: "zsh", cwd: "/x", cwdRawVisible: true, worktreeEnabled: false },
      onSuccess: (session) => seen.push({ session, stillOpen: modal() != null }),
    });
    await flush();
    (modal()!.querySelector("form.spawn-form") as HTMLFormElement).dispatchEvent(
      new Event("submit", { bubbles: true, cancelable: true }),
    );
    await flush();

    expect(seen).toHaveLength(1);
    expect(seen[0].session.id).toBe("s1");
    expect(seen[0].stillOpen).toBe(false);
  });
});