// @vitest-environment happy-dom
import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
import { afterEach, describe, expect, it, vi } from "vitest";

import {
  KILL_SESSION_EVENT,
  RENAME_SESSION_EVENT,
  SESSION_SELECT_EVENT,
  SPAWN_SIMILAR_EVENT,
} from "../../uiEvents.js";
import { COMMAND_SPECS, type Command } from "../../commands.js";
import type { Session } from "../../types.js";
import { CommandBar, SPAWN_DIRECTORY_EVENT, type CommandBarProps } from "./CommandBar.js";

vi.mock("../../api.js", async (importOriginal) => ({
  ...(await importOriginal<Record<string, unknown>>()),
  listDir: vi.fn(async () => ({ path: "", entries: [] })),
  projects: vi.fn(async () => []),
  recentDirs: vi.fn(async () => ({ dirs: [] })),
}));

function session(id: string, over: Partial<Session> = {}): Session {
  return {
    id,
    cwd: "/home/me/dev/api",
    command: "bash",
    env: {},
    metadata: { name: id },
    status: "Running",
    created_at: "2026-01-01T00:00:00Z",
    ...over,
  };
}

function command(over: Partial<Command> = {}): Command {
  return {
    id: "cmd",
    label: "A command",
    group: "Test",
    keys: ["a"],
    scope: "global",
    run: () => {},
    ...over,
  };
}

const sessions = [
  session("api", { current_cwd: "/home/me/dev/api", last_focused_at: "2026-01-01T11:00:00Z" }),
  session("worker", {
    current_cwd: "/home/me/dev/worker",
    last_focused_at: "2026-01-01T10:00:00Z",
  }),
  session("notes", { current_cwd: "/home/me/notes" }),
];

function open(over: Partial<CommandBarProps> = {}) {
  return render(
    <CommandBar
      sessions={sessions}
      homeDir="/home/me"
      commands={[]}
      onOpenSession={() => {}}
      onClose={() => {}}
      {...over}
    />,
  );
}

function input(): HTMLInputElement {
  return screen.getByRole("combobox") as HTMLInputElement;
}

function type(value: string): void {
  fireEvent.change(input(), { target: { value } });
}

function press(key: string, init: Record<string, unknown> = {}): void {
  fireEvent.keyDown(input(), { key, ...init });
}

function rowNames(): string[] {
  return [...document.querySelectorAll(".cmdbar-row-name")].map((r) => r.textContent ?? "");
}

function activeName(): string | undefined {
  return document.querySelector(".cmdbar-row.is-active .cmdbar-row-name")?.textContent ?? undefined;
}

afterEach(() => {
  cleanup();
  vi.clearAllMocks();
});

describe("the overlay", () => {
  it("is a registry command, so the help overlay lists it", () => {
    const spec = COMMAND_SPECS.find((s) => s.id === "bar.open");
    expect(spec?.keys).toEqual(["ctrl-k"]);
    expect(spec?.scope).toBe("global");
  });

  it("lists sessions by recency under a kind header on an empty query", () => {
    open();
    expect([...document.querySelectorAll(".cmdbar-group-title")].map((h) => h.textContent)).toEqual([
      "Sessions",
    ]);
    expect(rowNames()).toEqual(["api", "worker", "notes"]);
    expect(activeName()).toBe("api");
  });

  it("ranks a typed query through the matcher and highlights the matched range", () => {
    open();
    type("wor");
    expect(rowNames()).toEqual(["worker"]);
    expect([...document.querySelectorAll(".cmdbar-row-name mark")].map((m) => m.textContent)).toEqual(
      ["wor"],
    );
  });

  it("highlights inside the directory when that is the field that matched", () => {
    open();
    type("dev/wor");
    expect(rowNames()).toEqual(["worker"]);
    expect(
      [...document.querySelectorAll(".cmdbar-row-meta mark")].map((m) => m.textContent).join(""),
    ).toBe("dev/wor");
  });

  it("renders a no-results state rather than an empty list", () => {
    open();
    type("zzz");
    expect(rowNames()).toEqual([]);
    expect(screen.getByText("No matches")).toBeDefined();
  });

  it("moves the highlight with the arrows and ctrl-p/ctrl-n, without wrapping", () => {
    open();
    press("ArrowUp");
    expect(activeName()).toBe("api");
    press("ArrowDown");
    expect(activeName()).toBe("worker");
    press("n", { ctrlKey: true });
    expect(activeName()).toBe("notes");
    press("ArrowDown");
    expect(activeName()).toBe("notes");
    press("p", { ctrlKey: true });
    expect(activeName()).toBe("worker");
  });

  it("puts the highlight back on the best row whenever the query changes", () => {
    open();
    press("ArrowDown");
    expect(activeName()).toBe("worker");
    type("o");
    expect(activeName()).toBe(rowNames()[0]);
  });

  it("opens the highlighted session through the caller's open path on Enter", () => {
    const onOpenSession = vi.fn();
    const onClose = vi.fn();
    open({ onOpenSession, onClose });
    press("ArrowDown");
    press("Enter");
    expect(onOpenSession).toHaveBeenCalledWith("worker");
    expect(onClose).toHaveBeenCalled();
  });

  it("raises the shared select event when the caller supplies no handler", () => {
    const listener = vi.fn();
    document.addEventListener(SESSION_SELECT_EVENT, listener);
    open({ onOpenSession: undefined });
    press("Enter");
    document.removeEventListener(SESSION_SELECT_EVENT, listener);
    expect((listener.mock.calls[0][0] as CustomEvent).detail).toBe("api");
  });

  it("Enter on an empty result list does nothing", () => {
    const onOpenSession = vi.fn();
    const onClose = vi.fn();
    open({ onOpenSession, onClose });
    type("zzz");
    press("Enter");
    expect(onOpenSession).not.toHaveBeenCalled();
    expect(onClose).not.toHaveBeenCalled();
  });

  it("closes on Escape and on a press outside the panel", () => {
    const onClose = vi.fn();
    open({ onClose });
    press("Escape");
    expect(onClose).toHaveBeenCalledTimes(1);
    fireEvent.mouseDown(document.querySelector(".cmdbar-overlay") as HTMLElement);
    expect(onClose).toHaveBeenCalledTimes(2);
  });

  it("stays open for a press inside the panel", () => {
    const onClose = vi.fn();
    open({ onClose });
    fireEvent.mouseDown(document.querySelector(".cmdbar-panel") as HTMLElement);
    expect(onClose).not.toHaveBeenCalled();
  });

  it("returns the keyboard to whatever held it when it opened", () => {
    const before = document.createElement("input");
    document.body.appendChild(before);
    before.focus();
    const view = open();
    expect(document.activeElement).toBe(input());
    view.unmount();
    expect(document.activeElement).toBe(before);
    before.remove();
  });

  it("clicking a row opens that session", () => {
    const onOpenSession = vi.fn();
    open({ onOpenSession });
    fireEvent.click(document.querySelectorAll(".cmdbar-row")[1]);
    expect(onOpenSession).toHaveBeenCalledWith("worker");
  });
});

describe("the sigils", () => {
  const commands = [
    command({ id: "help.toggle", label: "Show help", keys: ["?"] }),
    command({ id: "spawn.open", label: "Open the spawn form", keys: ["n"], run: vi.fn() }),
  ];

  it("lists every command in registry order under `>`, with its chord and no header", () => {
    open({ commands });
    type(">");
    expect(rowNames()).toEqual(["Show help", "Open the spawn form"]);
    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
    expect([...document.querySelectorAll(".cmdbar-row-keys kbd")].map((k) => k.textContent)).toEqual(
      ["?", "n"],
    );
  });

  it("matches a command on its label and never on its chord", () => {
    open({ commands });
    type(">help");
    expect(rowNames()).toEqual(["Show help"]);
    type(">?");
    expect(rowNames()).toEqual([]);
  });

  it("runs the highlighted command on Enter", () => {
    const run = vi.fn();
    open({ commands: [command({ label: "Run me", run })] });
    type(">run");
    press("Enter");
    expect(run).toHaveBeenCalled();
  });

  it("keeps the list mixed with no sigil, and returns to it when the sigil goes", () => {
    open({ commands });
    type(">show");
    expect(rowNames()).toEqual(["Show help"]);
    type("");
    expect(rowNames()).toEqual(["api", "worker", "notes"]);
  });

  it("lists recent dirs then projects under `~`", async () => {
    open({ loadDirectories: async () => ["/home/me/dev/api", "/srv/x"] });
    type("~");
    await waitFor(() => expect(rowNames()).toEqual(["~/dev/api", "/srv/x"]));
    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
  });

  it("fills the list in from /api/dirs as a path is typed", async () => {
    const listDirEntries = vi.fn(async () => ["maestro", "api"]);
    open({ loadDirectories: async () => ["/home/me/notes"], listDirEntries });
    // The second `~` is a literal query character and reaches the matcher.
    type("~~/dev/mae");
    await waitFor(() => expect(rowNames()).toEqual(["~/dev/maestro"]));
    expect(listDirEntries).toHaveBeenCalledWith("~/dev/");
  });

  it("spawns in the highlighted directory on Enter", async () => {
    const onSpawnDirectory = vi.fn();
    open({ loadDirectories: async () => ["/srv/x"], onSpawnDirectory });
    type("~");
    await waitFor(() => expect(rowNames()).toEqual(["/srv/x"]));
    press("Enter");
    expect(onSpawnDirectory).toHaveBeenCalledWith("/srv/x");
  });

  it("raises the spawn event when the caller supplies no handler", async () => {
    const listener = vi.fn();
    document.addEventListener(SPAWN_DIRECTORY_EVENT, listener);
    open({ loadDirectories: async () => ["/srv/x"] });
    type("~");
    await waitFor(() => expect(rowNames()).toEqual(["/srv/x"]));
    press("Enter");
    document.removeEventListener(SPAWN_DIRECTORY_EVENT, listener);
    expect((listener.mock.calls[0][0] as CustomEvent).detail).toBe("/srv/x");
  });
});

describe("the session action page", () => {
  function drill(over: Partial<CommandBarProps> = {}) {
    const view = open(over);
    press("Tab");
    return view;
  }

  it("lists kill, rename and spawn similar for the highlighted session", () => {
    drill();
    expect(rowNames()).toEqual(["Kill session", "Rename session", "Spawn similar"]);
  });

  it("names the session being acted on", () => {
    drill();
    expect(screen.getByText('Actions for "api"')).toBeDefined();
  });

  it("drops the kind headers, since the page is one kind", () => {
    drill();
    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
  });

  it("stays fuzzy-searchable over the three actions", () => {
    drill();
    type("ren");
    expect(rowNames()).toEqual(["Rename session"]);
  });

  it("does nothing on a command row", () => {
    open({ commands: [command({ label: "Show help" })] });
    type(">show");
    press("Tab");
    expect(rowNames()).toEqual(["Show help"]);
  });

  it("does nothing on a directory row", async () => {
    open({ loadDirectories: async () => ["/srv/x"] });
    type("~");
    await waitFor(() => expect(rowNames()).toEqual(["/srv/x"]));
    press("Tab");
    expect(rowNames()).toEqual(["/srv/x"]);
  });

  it("returns to the result list on Escape, with the previous query intact", () => {
    const onClose = vi.fn();
    open({ onClose });
    type("wor");
    press("Tab");
    expect(rowNames()).toEqual(["Kill session", "Rename session", "Spawn similar"]);
    press("Escape");
    expect(onClose).not.toHaveBeenCalled();
    expect(input().value).toBe("wor");
    expect(rowNames()).toEqual(["worker"]);
  });

  it("returns to the result list on backspace at an empty query", () => {
    drill();
    fireEvent.keyDown(input(), { key: "Backspace" });
    expect(rowNames()).toEqual(["api", "worker", "notes"]);
  });

  it("keeps backspace ordinary while the page's query has text", () => {
    drill();
    type("ren");
    fireEvent.keyDown(input(), { key: "Backspace" });
    expect(rowNames()).toEqual(["Rename session"]);
  });

  it("closes the bar when the page's Escape has already been used", () => {
    const onClose = vi.fn();
    drill({ onClose });
    press("Escape");
    press("Escape");
    expect(onClose).toHaveBeenCalledTimes(1);
  });

  it("raises kill, rename and spawn similar with the session, closing the bar", () => {
    for (const [query, key] of [
      ["kill", "onKillSession"],
      ["rename", "onRenameSession"],
      ["spawn", "onSpawnSimilar"],
    ] as const) {
      const handler = vi.fn();
      const onClose = vi.fn();
      drill({ [key]: handler, onClose });
      type(query);
      press("Enter");
      expect(handler).toHaveBeenCalledWith(expect.objectContaining({ id: "api" }));
      expect(onClose).toHaveBeenCalled();
      cleanup();
    }
  });

  it("hands each action to the flow it already has, by default", () => {
    for (const [query, event] of [
      ["kill", KILL_SESSION_EVENT],
      ["rename", RENAME_SESSION_EVENT],
      ["spawn", SPAWN_SIMILAR_EVENT],
    ] as const) {
      const listener = vi.fn();
      document.addEventListener(event, listener);
      drill();
      type(query);
      press("Enter");
      document.removeEventListener(event, listener);
      expect((listener.mock.calls[0][0] as CustomEvent).detail.id).toBe("api");
      cleanup();
    }
  });
});