import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { escapeRegExp, formatEnvelopeTimestamp } from "../../test/helpers/envelope-timestamp.js";

let createTelegramBot: typeof import("./bot.js").createTelegramBot;
let resetInboundDedupe: typeof import("../auto-reply/reply/inbound-dedupe.js").resetInboundDedupe;

const { sessionStorePath } = vi.hoisted(() => ({
  sessionStorePath: `/tmp/clawdbot-telegram-${Math.random().toString(16).slice(2)}.json`,
}));

const { loadWebMedia } = vi.hoisted(() => ({
  loadWebMedia: vi.fn(),
}));

vi.mock("../web/media.js", () => ({
  loadWebMedia,
}));

const { loadConfig } = vi.hoisted(() => ({
  loadConfig: vi.fn(() => ({})),
}));
vi.mock("../config/config.js", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../config/config.js")>();
  return {
    ...actual,
    loadConfig,
  };
});

vi.mock("../config/sessions.js", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../config/sessions.js")>();
  return {
    ...actual,
    resolveStorePath: vi.fn((storePath) => storePath ?? sessionStorePath),
  };
});

const { readTelegramAllowFromStore, upsertTelegramPairingRequest } = vi.hoisted(() => ({
  readTelegramAllowFromStore: vi.fn(async () => [] as string[]),
  upsertTelegramPairingRequest: vi.fn(async () => ({
    code: "PAIRCODE",
    created: true,
  })),
}));

vi.mock("./pairing-store.js", () => ({
  readTelegramAllowFromStore,
  upsertTelegramPairingRequest,
}));

const useSpy = vi.fn();
const middlewareUseSpy = vi.fn();
const onSpy = vi.fn();
const stopSpy = vi.fn();
const commandSpy = vi.fn();
const botCtorSpy = vi.fn();
const answerCallbackQuerySpy = vi.fn(async () => undefined);
const sendChatActionSpy = vi.fn();
const setMessageReactionSpy = vi.fn(async () => undefined);
const setMyCommandsSpy = vi.fn(async () => undefined);
const sendMessageSpy = vi.fn(async () => ({ message_id: 77 }));
const sendAnimationSpy = vi.fn(async () => ({ message_id: 78 }));
const sendPhotoSpy = vi.fn(async () => ({ message_id: 79 }));
type ApiStub = {
  config: { use: (arg: unknown) => void };
  answerCallbackQuery: typeof answerCallbackQuerySpy;
  sendChatAction: typeof sendChatActionSpy;
  setMessageReaction: typeof setMessageReactionSpy;
  setMyCommands: typeof setMyCommandsSpy;
  sendMessage: typeof sendMessageSpy;
  sendAnimation: typeof sendAnimationSpy;
  sendPhoto: typeof sendPhotoSpy;
};
const apiStub: ApiStub = {
  config: { use: useSpy },
  answerCallbackQuery: answerCallbackQuerySpy,
  sendChatAction: sendChatActionSpy,
  setMessageReaction: setMessageReactionSpy,
  setMyCommands: setMyCommandsSpy,
  sendMessage: sendMessageSpy,
  sendAnimation: sendAnimationSpy,
  sendPhoto: sendPhotoSpy,
};

vi.mock("grammy", () => ({
  Bot: class {
    api = apiStub;
    use = middlewareUseSpy;
    on = onSpy;
    stop = stopSpy;
    command = commandSpy;
    constructor(
      public token: string,
      public options?: { client?: { fetch?: typeof fetch } },
    ) {
      botCtorSpy(token, options);
    }
  },
  InputFile: class {},
  webhookCallback: vi.fn(),
}));

const sequentializeMiddleware = vi.fn();
const sequentializeSpy = vi.fn(() => sequentializeMiddleware);
let _sequentializeKey: ((ctx: unknown) => string) | undefined;
vi.mock("@grammyjs/runner", () => ({
  sequentialize: (keyFn: (ctx: unknown) => string) => {
    _sequentializeKey = keyFn;
    return sequentializeSpy();
  },
}));

const throttlerSpy = vi.fn(() => "throttler");

vi.mock("@grammyjs/transformer-throttler", () => ({
  apiThrottler: () => throttlerSpy(),
}));

vi.mock("../auto-reply/reply.js", () => {
  const replySpy = vi.fn(async (_ctx, opts) => {
    await opts?.onReplyStart?.();
    return undefined;
  });
  return { getReplyFromConfig: replySpy, __replySpy: replySpy };
});

let replyModule: typeof import("../auto-reply/reply.js");

const getOnHandler = (event: string) => {
  const handler = onSpy.mock.calls.find((call) => call[0] === event)?.[1];
  if (!handler) throw new Error(`Missing handler for event: ${event}`);
  return handler as (ctx: Record<string, unknown>) => Promise<void>;
};

const ORIGINAL_TZ = process.env.TZ;
describe("createTelegramBot", () => {
  beforeEach(async () => {
    vi.resetModules();
    ({ resetInboundDedupe } = await import("../auto-reply/reply/inbound-dedupe.js"));
    ({ createTelegramBot } = await import("./bot.js"));
    replyModule = await import("../auto-reply/reply.js");
    process.env.TZ = "UTC";
    resetInboundDedupe();
    loadConfig.mockReturnValue({
      channels: {
        telegram: { dmPolicy: "open", allowFrom: ["*"] },
      },
    });
    loadWebMedia.mockReset();
    sendAnimationSpy.mockReset();
    sendPhotoSpy.mockReset();
    setMessageReactionSpy.mockReset();
    answerCallbackQuerySpy.mockReset();
    setMyCommandsSpy.mockReset();
    middlewareUseSpy.mockReset();
    sequentializeSpy.mockReset();
    botCtorSpy.mockReset();
    _sequentializeKey = undefined;
  });
  afterEach(() => {
    process.env.TZ = ORIGINAL_TZ;
  });

  // groupPolicy tests

  it("accepts group messages when mentionPatterns match (without @botUsername)", async () => {
    onSpy.mockReset();
    const replySpy = replyModule.__replySpy as unknown as ReturnType<typeof vi.fn>;
    replySpy.mockReset();

    loadConfig.mockReturnValue({
      agents: {
        defaults: {
          envelopeTimezone: "utc",
        },
      },
      identity: { name: "Bert" },
      messages: { groupChat: { mentionPatterns: ["\\bbert\\b"] } },
      channels: {
        telegram: {
          groupPolicy: "open",
          groups: { "*": { requireMention: true } },
        },
      },
    });

    createTelegramBot({ token: "tok" });
    const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;

    await handler({
      message: {
        chat: { id: 7, type: "group", title: "Test Group" },
        text: "bert: introduce yourself",
        date: 1736380800,
        message_id: 1,
        from: { id: 9, first_name: "Ada" },
      },
      me: { username: "clawdbot_bot" },
      getFile: async () => ({ download: async () => new Uint8Array() }),
    });

    expect(replySpy).toHaveBeenCalledTimes(1);
    const payload = replySpy.mock.calls[0][0];
    expect(payload.WasMentioned).toBe(true);
    expect(payload.SenderName).toBe("Ada");
    expect(payload.SenderId).toBe("9");
    const expectedTimestamp = formatEnvelopeTimestamp(new Date("2025-01-09T00:00:00Z"));
    const timestampPattern = escapeRegExp(expectedTimestamp);
    expect(payload.Body).toMatch(
      new RegExp(`^\\[Telegram Test Group id:7 (\\+\\d+[smhd] )?${timestampPattern}\\]`),
    );
  });

  it("skips group messages when another user is explicitly mentioned", async () => {
    onSpy.mockReset();
    const replySpy = replyModule.__replySpy as unknown as ReturnType<typeof vi.fn>;
    replySpy.mockReset();

    loadConfig.mockReturnValue({
      agents: {
        defaults: {
          envelopeTimezone: "utc",
        },
      },
      identity: { name: "Bert" },
      messages: { groupChat: { mentionPatterns: ["\\bbert\\b"] } },
      channels: {
        telegram: {
          groupPolicy: "open",
          groups: { "*": { requireMention: true } },
        },
      },
    });

    createTelegramBot({ token: "tok" });
    const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;

    await handler({
      message: {
        chat: { id: 7, type: "group", title: "Test Group" },
        text: "bert: hello @alice",
        entities: [{ type: "mention", offset: 12, length: 6 }],
        date: 1736380800,
        message_id: 3,
        from: { id: 9, first_name: "Ada" },
      },
      me: { username: "clawdbot_bot" },
      getFile: async () => ({ download: async () => new Uint8Array() }),
    });

    expect(replySpy).not.toHaveBeenCalled();
  });

  it("keeps group envelope headers stable (sender identity is separate)", async () => {
    onSpy.mockReset();
    const replySpy = replyModule.__replySpy as unknown as ReturnType<typeof vi.fn>;
    replySpy.mockReset();

    loadConfig.mockReturnValue({
      agents: {
        defaults: {
          envelopeTimezone: "utc",
        },
      },
      channels: {
        telegram: {
          groupPolicy: "open",
          groups: { "*": { requireMention: false } },
        },
      },
    });

    createTelegramBot({ token: "tok" });
    const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;

    await handler({
      message: {
        chat: { id: 42, type: "group", title: "Ops" },
        text: "hello",
        date: 1736380800,
        message_id: 2,
        from: {
          id: 99,
          first_name: "Ada",
          last_name: "Lovelace",
          username: "ada",
        },
      },
      me: { username: "clawdbot_bot" },
      getFile: async () => ({ download: async () => new Uint8Array() }),
    });

    expect(replySpy).toHaveBeenCalledTimes(1);
    const payload = replySpy.mock.calls[0][0];
    expect(payload.SenderName).toBe("Ada Lovelace");
    expect(payload.SenderId).toBe("99");
    expect(payload.SenderUsername).toBe("ada");
    const expectedTimestamp = formatEnvelopeTimestamp(new Date("2025-01-09T00:00:00Z"));
    const timestampPattern = escapeRegExp(expectedTimestamp);
    expect(payload.Body).toMatch(
      new RegExp(`^\\[Telegram Ops id:42 (\\+\\d+[smhd] )?${timestampPattern}\\]`),
    );
  });
  it("reacts to mention-gated group messages when ackReaction is enabled", async () => {
    onSpy.mockReset();
    setMessageReactionSpy.mockReset();
    const replySpy = replyModule.__replySpy as unknown as ReturnType<typeof vi.fn>;
    replySpy.mockReset();

    loadConfig.mockReturnValue({
      messages: {
        ackReaction: "👀",
        ackReactionScope: "group-mentions",
        groupChat: { mentionPatterns: ["\\bbert\\b"] },
      },
      channels: {
        telegram: {
          groupPolicy: "open",
          groups: { "*": { requireMention: true } },
        },
      },
    });

    createTelegramBot({ token: "tok" });
    const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;

    await handler({
      message: {
        chat: { id: 7, type: "group", title: "Test Group" },
        text: "bert hello",
        date: 1736380800,
        message_id: 123,
        from: { id: 9, first_name: "Ada" },
      },
      me: { username: "clawdbot_bot" },
      getFile: async () => ({ download: async () => new Uint8Array() }),
    });

    expect(setMessageReactionSpy).toHaveBeenCalledWith(7, 123, [{ type: "emoji", emoji: "👀" }]);
  });
  it("clears native commands when disabled", () => {
    loadConfig.mockReturnValue({
      commands: { native: false },
    });

    createTelegramBot({ token: "tok" });

    expect(setMyCommandsSpy).toHaveBeenCalledWith([]);
  });
  it("skips group messages when requireMention is enabled and no mention matches", async () => {
    onSpy.mockReset();
    const replySpy = replyModule.__replySpy as unknown as ReturnType<typeof vi.fn>;
    replySpy.mockReset();

    loadConfig.mockReturnValue({
      messages: { groupChat: { mentionPatterns: ["\\bbert\\b"] } },
      channels: {
        telegram: {
          groupPolicy: "open",
          groups: { "*": { requireMention: true } },
        },
      },
    });

    createTelegramBot({ token: "tok" });
    const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;

    await handler({
      message: {
        chat: { id: 7, type: "group", title: "Test Group" },
        text: "hello everyone",
        date: 1736380800,
        message_id: 2,
        from: { id: 9, first_name: "Ada" },
      },
      me: { username: "clawdbot_bot" },
      getFile: async () => ({ download: async () => new Uint8Array() }),
    });

    expect(replySpy).not.toHaveBeenCalled();
  });
  it("allows group messages when requireMention is enabled but mentions cannot be detected", async () => {
    onSpy.mockReset();
    const replySpy = replyModule.__replySpy as unknown as ReturnType<typeof vi.fn>;
    replySpy.mockReset();

    loadConfig.mockReturnValue({
      messages: { groupChat: { mentionPatterns: [] } },
      channels: {
        telegram: {
          groupPolicy: "open",
          groups: { "*": { requireMention: true } },
        },
      },
    });

    createTelegramBot({ token: "tok" });
    const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;

    await handler({
      message: {
        chat: { id: 7, type: "group", title: "Test Group" },
        text: "hello everyone",
        date: 1736380800,
        message_id: 3,
        from: { id: 9, first_name: "Ada" },
      },
      me: {},
      getFile: async () => ({ download: async () => new Uint8Array() }),
    });

    expect(replySpy).toHaveBeenCalledTimes(1);
    const payload = replySpy.mock.calls[0][0];
    expect(payload.WasMentioned).toBe(false);
  });
  it("includes reply-to context when a Telegram reply is received", async () => {
    onSpy.mockReset();
    sendMessageSpy.mockReset();
    const replySpy = replyModule.__replySpy as unknown as ReturnType<typeof vi.fn>;
    replySpy.mockReset();

    createTelegramBot({ token: "tok" });
    const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;

    await handler({
      message: {
        chat: { id: 7, type: "private" },
        text: "Sure, see below",
        date: 1736380800,
        reply_to_message: {
          message_id: 9001,
          text: "Can you summarize this?",
          from: { first_name: "Ada" },
        },
      },
      me: { username: "clawdbot_bot" },
      getFile: async () => ({ download: async () => new Uint8Array() }),
    });

    expect(replySpy).toHaveBeenCalledTimes(1);
    const payload = replySpy.mock.calls[0][0];
    expect(payload.Body).toContain("[Replying to Ada id:9001]");
    expect(payload.Body).toContain("Can you summarize this?");
    expect(payload.ReplyToId).toBe("9001");
    expect(payload.ReplyToBody).toBe("Can you summarize this?");
    expect(payload.ReplyToSender).toBe("Ada");
  });
});
