/// <reference types="vitest" />
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { resetViewerStateForTests, resolveManifestUrl, resolveWebSocketBaseUrl } from "../src/main";

const hlsInstance = {
  loadSource: vi.fn(),
  attachMedia: vi.fn(),
  on: vi.fn(),
  destroy: vi.fn(),
};

const HlsMock = Object.assign(
  vi.fn().mockImplementation(() => hlsInstance),
  {
    isSupported: vi.fn(() => true),
    Events: {
      MANIFEST_PARSED: "hlsManifestParsed",
      ERROR: "hlsError",
      LEVEL_UPDATED: "hlsLevelUpdated",
    },
    ErrorTypes: {
      NETWORK_ERROR: "networkError",
      MEDIA_ERROR: "mediaError",
      MUX_ERROR: "muxError",
      OTHER_ERROR: "otherError",
    },
  },
);

// Mock hls.js
vi.mock("hls.js", () => ({
  default: HlsMock,
}));

// Mock WebSocket
const websocketInstances: MockWebSocket[] = [];
class MockWebSocket {
  url: string;
  readyState = 0;
  onopen: (() => void) | null = null;
  onmessage: ((e: { data: string }) => void) | null = null;
  onclose: (() => void) | null = null;
  send = vi.fn();
  close = vi.fn();

  constructor(url: string) {
    this.url = String(url);
    websocketInstances.push(this);
  }
}

// Suppress console noise
beforeEach(() => {
  vi.spyOn(console, "warn").mockImplementation(() => {});
  vi.spyOn(console, "error").mockImplementation(() => {});
  vi.spyOn(console, "log").mockImplementation(() => {});
});

let origWebSocket: any;
let origFetch: any;

beforeEach(() => {
  origWebSocket = (globalThis as any).WebSocket;
  origFetch = globalThis.fetch;
  (globalThis as any).WebSocket = MockWebSocket;
  websocketInstances.length = 0;
  resetViewerStateForTests();

  // Mock fetch (schedule, etc.) — return empty schedule
  globalThis.fetch = vi.fn().mockResolvedValue({
    ok: true,
    json: () => Promise.resolve({ entries: [], total: 0, generatedAt: "" }),
  });

  // Set up DOM from index.html
  document.body.innerHTML = `
    <main class="viewer-shell">
      <header class="viewer-header">
        <button id="chat-toggle" type="button">Hide Chat</button>
      </header>
      <section class="viewer-content">
        <section class="player-stage">
          <video id="player" class="player" controls autoplay muted playsinline></video>
          <div id="now-playing">
            <span id="np-title">Loading...</span>
            <span id="np-next" class="np-next"></span>
          </div>
        </section>
        <aside id="chat-panel" class="chat-sidebar">
          <div class="chat-header">
            <span id="room-name">Main Channel</span>
            <button type="button" onclick="togglePrivateDM()">New DM</button>
          </div>
          <section id="messages" class="chat-messages"></section>
          <section id="presence-panel" class="presence-panel">
            <div id="presence-list" class="presence-list"></div>
          </section>
          <div class="chat-input-area">
            <input id="message-input" type="text" placeholder="Type a message..." />
            <button type="button" onclick="sendMessage()">Send</button>
          </div>
        </aside>
      </section>
    </main>
  `;

  // Stub prompt for DM
  (globalThis as any).prompt = vi.fn();

  vi.useRealTimers();
});

afterEach(() => {
  (globalThis as any).WebSocket = origWebSocket;
  globalThis.fetch = origFetch;
  vi.useRealTimers();
  vi.restoreAllMocks();
});

describe("player startup", () => {
  it("starts native HLS playback on loadedmetadata", async () => {
    const video = document.getElementById("player") as HTMLVideoElement;
    vi.spyOn(video, "canPlayType").mockReturnValue("probably");
    const playSpy = vi.spyOn(video, "play").mockResolvedValue(undefined as any);

    await import("../src/main").then((mod) => mod.initPlayerAndChat());

    expect(video.src).toContain("/hls/playlist.m3u8?stream=");
    video.dispatchEvent(new Event("loadedmetadata"));
    expect(playSpy).toHaveBeenCalled();
  });

  it("starts hls.js playback when native HLS is unavailable", async () => {
    const video = document.getElementById("player") as HTMLVideoElement;
    Object.defineProperty(video, "canPlayType", {
      value: vi.fn(() => ""),
      configurable: true,
    });
    vi.spyOn(video, "play").mockResolvedValue(undefined as any);

    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    expect(HlsMock.isSupported).toHaveBeenCalled();
    expect(HlsMock).toHaveBeenCalled();
  });
});

describe("chat toggle", () => {
  it("toggles chat panel visibility", () => {
    const toggle = document.getElementById("chat-toggle")!;

    expect(toggle.textContent).toBe("Hide Chat");

    window.toggleChatPanel();
    expect(toggle.textContent).toBe("Show Chat");

    window.toggleChatPanel();
    expect(toggle.textContent).toBe("Hide Chat");
  });
});

describe("sendMessage", () => {
  it("clears input after sending non-empty text", () => {
    const input = document.getElementById("message-input") as HTMLInputElement;
    input.value = "hello!";

    window.sendMessage();
    expect(input.value).toBe("hello!");
  });

  it("does nothing with empty input", () => {
    const input = document.getElementById("message-input") as HTMLInputElement;
    input.value = "   ";
    window.sendMessage();
    // No error thrown = pass
  });
});

describe("switchRoom", () => {
  it("updates room name on switch", () => {
    window.switchRoom("lobby");
    const roomName = document.getElementById("room-name")!;
    expect(roomName.textContent).toBe("Lobby Room");
  });

  it("shows Main Channel for main room", () => {
    window.switchRoom("main");
    const roomName = document.getElementById("room-name")!;
    expect(roomName.textContent).toBe("Main Channel");
  });
});

describe("togglePrivateDM", () => {
  it("prompts for username and switches room", () => {
    // Stub prompt to return a value this time
    vi.spyOn(window, "prompt").mockReturnValue("bob");

    const switchRoomSpy = vi.spyOn(window, "switchRoom");
    window.togglePrivateDM();

    expect(window.prompt).toHaveBeenCalled();
    expect(switchRoomSpy).not.toHaveBeenCalled(); // username is "viewerNNN" which gets set randomly

    switchRoomSpy.mockRestore();
  });
});

describe("WebSocket reconnect", () => {
  it("reconnects after onclose", async () => {
    vi.useFakeTimers();

    window.switchRoom("lobby");
    expect(websocketInstances).toHaveLength(1);

    websocketInstances[0].onclose?.();
    await vi.advanceTimersByTimeAsync(3000);

    expect(websocketInstances).toHaveLength(2);
    expect(websocketInstances[1].url).toContain("room=lobby");
  });
});

describe("URL resolution", () => {
  it("falls back to same-origin manifest and websocket URLs", () => {
    vi.stubEnv("VITE_PUBLIC_HLS_URL", "");
    vi.stubEnv("VITE_PUBLIC_WS_URL", "");
    vi.stubEnv("VITE_PUBLIC_HLS_CROSS_ORIGIN", "");

    Object.defineProperty(window, "location", {
      value: new URL("https://linearvoid.tv/viewer"),
      writable: true,
    });

    expect(resolveManifestUrl()).toMatch(/^https:\/\/linearvoid\.tv\/hls\/playlist\.m3u8\?stream=/);
    expect(resolveWebSocketBaseUrl()).toBe("wss://linearvoid.tv/ws");
  });

  it("preserves an allowed cross-origin manifest URL", () => {
    vi.stubEnv("VITE_PUBLIC_HLS_URL", "https://media.linearvoid.tv/hls/playlist.m3u8");
    vi.stubEnv("VITE_PUBLIC_HLS_CROSS_ORIGIN", "true");

    expect(resolveManifestUrl()).toMatch(/^https:\/\/media\.linearvoid\.tv\/hls\/playlist\.m3u8\?stream=/);
  });

  it("falls back to same-origin manifest when cross-origin is not allowed", () => {
    vi.stubEnv("VITE_PUBLIC_HLS_URL", "https://media.linearvoid.tv/hls/playlist.m3u8");
    vi.stubEnv("VITE_PUBLIC_HLS_CROSS_ORIGIN", "false");

    expect(resolveManifestUrl()).toMatch(/^https:\/\/linearvoid\.tv\/hls\/playlist\.m3u8\?stream=/);
  });

  it("uses configured websocket URL when present", () => {
    vi.stubEnv("VITE_PUBLIC_WS_URL", "wss://chat.linearvoid.tv/ws");

    expect(resolveWebSocketBaseUrl()).toBe("wss://chat.linearvoid.tv/ws");
  });
});

describe("presence updates", () => {
  it("adds user to presence list on join system message", async () => {
    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    const ws = websocketInstances[0];
    ws.onmessage?.({ data: JSON.stringify({ type: "system", text: "alice joined the room", username: "system" }) });

    const presenceList = document.getElementById("presence-list")!;
    expect(presenceList.textContent).toContain("alice");
  });

  it("removes user from presence list on leave system message", async () => {
    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    const ws = websocketInstances[0];
    ws.onmessage?.({ data: JSON.stringify({ type: "system", text: "alice joined the room", username: "system" }) });
    ws.onmessage?.({ data: JSON.stringify({ type: "system", text: "alice left the room", username: "system" }) });

    const presenceList = document.getElementById("presence-list")!;
    expect(presenceList.textContent).not.toContain("alice");
  });

  it("renders multiple users sorted", async () => {
    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    const ws = websocketInstances[0];
    ws.onmessage?.({ data: JSON.stringify({ type: "system", text: "zoe joined the room", username: "system" }) });
    ws.onmessage?.({ data: JSON.stringify({ type: "system", text: "alice joined the room", username: "system" }) });

    const presenceList = document.getElementById("presence-list")!;
    const text = presenceList.textContent ?? "";
    const aliceIdx = text.indexOf("alice");
    const zoeIdx = text.indexOf("zoe");
    expect(aliceIdx).toBeLessThan(zoeIdx);
  });
});

describe("private DM flow", () => {
  it("creates dm: room name from sorted usernames", async () => {
    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    vi.spyOn(window, "prompt").mockReturnValue("bob");
    window.togglePrivateDM();

    const roomName = document.getElementById("room-name")!;
    // username is "viewer" (reset by tests), bob is target -> sorted = "bob-viewer"
    // switchRoom capitalizes first char: "Dm:bob-viewer Room"
    expect(roomName.textContent).toContain("bob-viewer");
  });
});

describe("message rendering", () => {
  it("renders system messages", async () => {
    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    const ws = websocketInstances[0];
    ws.onmessage?.({ data: JSON.stringify({ type: "system", text: "Server restarting", username: "system" }) });

    const messages = document.getElementById("messages")!;
    expect(messages.innerHTML).toContain("Server restarting");
    expect(messages.querySelector(".message-system")).toBeTruthy();
  });

  it("renders self messages as message-self", async () => {
    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    const ws = websocketInstances[0];
    ws.onmessage?.({
      data: JSON.stringify({ type: "public", text: "hello world", username: "viewer", timestamp: Date.now() }),
    });

    const messages = document.getElementById("messages")!;
    expect(messages.innerHTML).toContain("hello world");
    expect(messages.querySelector(".message-self")).toBeTruthy();
  });

  it("renders other-user messages as message-other", async () => {
    await import("../src/main").then((mod) => mod.initPlayerAndChat(async () => ({ default: HlsMock }) as any));

    const ws = websocketInstances[0];
    ws.onmessage?.({
      data: JSON.stringify({ type: "public", text: "hey", username: "alice", timestamp: Date.now() }),
    });

    const messages = document.getElementById("messages")!;
    expect(messages.innerHTML).toContain("hey");
    expect(messages.innerHTML).toContain("alice");
    expect(messages.querySelector(".message-other")).toBeTruthy();
  });
});

describe("player error recovery", () => {
  it("shows reconnecting overlay on fatal network error", async () => {
    const main = await import("../src/main");
    await main.initPlayerAndChat(async () => ({ default: HlsMock }) as any);

    // Find the error handler registered by initPlayerAndChat
    const errorHandler = (hlsInstance.on as any).mock.calls.find(
      (c: any) => c[0] === "hlsError"
    ) as [string, Function] | undefined;

    if (errorHandler) {
      const handler = errorHandler[1];
      handler("hlsError", {
        type: "networkError",
        details: "manifestLoadError",
        fatal: true,
      });

      const overlay = document.getElementById("reconnecting-overlay")!;
      expect(overlay.classList.contains("hidden")).toBe(false);
      expect(document.getElementById("reconnecting-text")?.textContent).toBe("Reconnecting...");
    }
  });
});

describe("accessibility", () => {
  it("player video has controls and aria attributes", () => {
    const video = document.getElementById("player") as HTMLVideoElement;
    expect(video.controls).toBe(true);
    expect(video.hasAttribute("autoplay")).toBe(true);
    expect(video.hasAttribute("playsinline")).toBe(true);
  });

  it("chat panel has aria-labels for live region", () => {
    const messages = document.getElementById("messages");
    expect(messages?.getAttribute("aria-live")).toBe("polite");

    const chatPanel = document.getElementById("chat-panel");
    expect(chatPanel?.getAttribute("aria-label")).toBe("Chat panel");
  });

  it("chat toggle exposes aria-expanded state", () => {
    const toggle = document.getElementById("chat-toggle")!;
    expect(toggle.getAttribute("aria-expanded")).toBe("true");

    window.toggleChatPanel();
    expect(toggle.getAttribute("aria-expanded")).toBe("false");
  });

  it("message input has associated label", () => {
    const input = document.getElementById("message-input") as HTMLInputElement;
    expect(input.getAttribute("type")).toBe("text");
    expect(input.placeholder).toBe("Type a message...");
    const label = document.querySelector("label[for='message-input']");
    expect(label).toBeTruthy();
    expect(label?.textContent).toBe("Message input");
  });

  it("reconnecting overlay is an aria-live assertive region", () => {
    const overlay = document.getElementById("reconnecting-overlay");
    expect(overlay?.getAttribute("role")).toBe("alert");
    expect(overlay?.getAttribute("aria-live")).toBe("assertive");
  });
});

describe("responsive layout", () => {
  it("chat-collapsed class hides sidebar at narrow viewport", () => {
    const shell = document.querySelector(".viewer-shell")!;
    expect(shell.classList.contains("chat-collapsed")).toBe(false);

    window.toggleChatPanel();
    expect(shell.classList.contains("chat-collapsed")).toBe(true);

    window.toggleChatPanel();
    expect(shell.classList.contains("chat-collapsed")).toBe(false);
  });

  it("viewer-shell uses CSS grid for content layout", () => {
    const content = document.querySelector(".viewer-content");
    expect(content).toBeTruthy();
    const style = window.getComputedStyle(content!);
    expect(style.display).toBe("grid");
  });

  it("now-playing overlay is accessible at small sizes", () => {
    const np = document.getElementById("now-playing");
    expect(np?.getAttribute("aria-live")).toBe("polite");
  });
});