import fs from "fs";
import path from "path";
import { db } from "../db";
import { conversationMessages, conversationMembers, users, bots, type Bot, type User } from "@shared/schema";
import { eq, and } from "drizzle-orm";
import { eventBus } from "../routes/shared";
import { enrichMessage, getMembersForSSE } from "../routes/messenger.helpers";
import { notificationService } from "../services/notification.service";
import { getOrCreateVpnSubscription, extractRoomUrl } from "./vpn.service";
import { VPN_BOT_LOGIN } from "./vpn.config";

const APPS_BASE_URL = process.env.APP_URL
  ? `${process.env.APP_URL.replace(/\/$/, "")}/apps`
  : "https://iistwin.ru/apps";

const ANDROID_FILE = "Olcbox-1.0.112-android-release.apk";
const IOS_FILE = "Olcbox-1.0.112-ios-unsigned.ipa";

const INSTRUCTIONS_TEXT = `Привет! Для получения корпоративного VPN:

1. Открой Яндекс Телемост (приложение или https://telemost.yandex.ru).
2. Создай новую видеовстречу.
3. Пришли сюда ссылку на встречу. Примеры того, что подходит:

• https://telemost.yandex.ru/j/abc123def456
• telemost.yandex.ru/j/abc123def456
• abc123def456

Можно прислать и сопроводительный текст — я сам найду ссылку.`;

const PLATFORM_PROMPT = `Ссылка принята. Выбери платформу, и я пришлю подходящий файл приложения olcbox.`;

const PLATFORM_BUTTONS: BotButton[] = [
  { text: "Android", callbackData: "platform:android", style: "primary" },
  { text: "iPhone (iOS)", callbackData: "platform:ios", style: "secondary" },
];

const IOS_WARNING = `⚠️ Файл для iOS не подписан. Как его установить на iPhone — честно, не знаю, придётся разбираться самому (AltStore, enterprise-сертификат и т.п.).`;

function formatUserName(user: User): string {
  const parts = [user.firstName, user.lastName].filter(Boolean);
  return parts.join(" ") || user.email || "Сотрудник";
}

type Attachment = { url: string; name: string; size: number; mimeType?: string };

type BotButton = { text: string; callbackData: string; style?: 'primary' | 'secondary' | 'destructive' | 'outline'; row?: number };

export async function sendVpnBotMessage(
  conversationId: number,
  text: string,
  organizationId: number,
  attachments?: Attachment[],
  buttons?: BotButton[],
): Promise<void> {
  const [msg] = await db
    .insert(conversationMessages)
    .values({
      conversationId,
      authorId: null,
      botId: (await getVpnBotId(organizationId)) ?? null,
      message: text.trim(),
      replyToId: null,
      mentionedUserIds: null,
      attachments: attachments?.length ? attachments : null,
      botButtons: buttons?.length ? buttons : null,
    })
    .returning();

  const enriched = await enrichMessage(msg.id);
  const members = await getMembersForSSE(conversationId, organizationId);

  for (const { userId: memberId, orgId: memberOrgId } of members) {
    eventBus.publishEvent({
      type: "conv_message_created",
      data: { conversationId, message: enriched },
      organizationId: memberOrgId,
      userId: memberId,
    });
  }

  const memberMuteRows = await db
    .select({ userId: conversationMembers.userId, mutedAt: conversationMembers.mutedAt, externalOrgId: conversationMembers.externalOrgId })
    .from(conversationMembers)
    .where(eq(conversationMembers.conversationId, conversationId));

  const memberOrgMap = new Map(
    memberMuteRows.map(r => [r.userId, { orgId: r.externalOrgId ?? organizationId, mutedAt: r.mutedAt ?? null }]),
  );

  notificationService.notifyMessengerMessage({
    conversationId,
    authorId: -1,
    authorName: "ВПН бот",
    chatName: "ВПН бот",
    chatType: "bot_direct",
    messageText: text.trim(),
    mentionedUserIds: [],
    memberOrgMap,
  }).catch(err => console.error("[VPN Bot] notify error:", err));
}

async function getVpnBotId(organizationId: number): Promise<number | null> {
  const [bot] = await db
    .select({ id: bots.id })
    .from(bots)
    .where(and(eq(bots.organizationId, organizationId), eq(bots.login, VPN_BOT_LOGIN)))
    .limit(1);
  return bot?.id ?? null;
}

// Simple in-memory state for the platform-selection step.
// Key = conversationId. TTL cleanup runs every 5 minutes.
const pendingPlatform = new Map<number, { roomUrl: string; createdAt: number }>();

function cleanPending() {
  const cutoff = Date.now() - 10 * 60 * 1000;
  for (const [key, value] of pendingPlatform.entries()) {
    if (value.createdAt < cutoff) pendingPlatform.delete(key);
  }
}
setInterval(cleanPending, 5 * 60 * 1000);

function detectPlatform(text: string): "android" | "ios" | null {
  const lower = text.toLowerCase();
  if (/\b(android|андроид|samsung|xiaomi|pixel|huawei|honор|poco|redmi|galaxy)\b/i.test(lower)) {
    return "android";
  }
  if (/\b(iphone|ios|айфон|ipad|apple)\b/i.test(lower)) {
    return "ios";
  }
  return null;
}

function getFileAttachment(filename: string): Attachment {
  const filePath = path.join("/app/apps", filename);
  let size = 0;
  try {
    size = fs.statSync(filePath).size;
  } catch (e) {
    console.error(`[VPN Bot] could not stat ${filePath}:`, e);
  }
  const ext = path.extname(filename).toLowerCase();
  const mimeType = ext === ".apk" ? "application/vnd.android.package-archive" : "application/octet-stream";
  return {
    url: `${APPS_BASE_URL}/${filename}`,
    name: filename,
    size,
    mimeType,
  };
}

export async function handleVpnBotDirectMessage({
  bot,
  conversationId,
  message,
  user,
  organizationId,
}: {
  bot: Bot;
  conversationId: number;
  message: string;
  user: User;
  organizationId: number;
}): Promise<void> {
  const text = message.trim();
  const lower = text.toLowerCase();

  if (lower === "статус" || lower === "status") {
    await sendVpnBotMessage(
      conversationId,
      "Статус подписки пока не реализован. Пришлите ссылку на встречу для получения подписки.",
      organizationId,
    );
    return;
  }

  // Continue platform-selection dialog (text fallback)
  const pending = pendingPlatform.get(conversationId);
  if (pending) {
    const platform = detectPlatform(text);
    if (!platform) {
      await sendVpnBotMessage(conversationId, PLATFORM_PROMPT, organizationId, undefined, PLATFORM_BUTTONS);
      return;
    }
    pendingPlatform.delete(conversationId);
    await processPlatformSelection({ conversationId, user, organizationId, roomUrl: pending.roomUrl, platform });
    return;
  }

  const roomUrl = extractRoomUrl(text);
  if (!roomUrl) {
    await sendVpnBotMessage(conversationId, INSTRUCTIONS_TEXT, organizationId);
    return;
  }

  // Start platform-selection dialog with buttons
  pendingPlatform.set(conversationId, { roomUrl, createdAt: Date.now() });
  await sendVpnBotMessage(conversationId, PLATFORM_PROMPT, organizationId, undefined, PLATFORM_BUTTONS);
}

async function processPlatformSelection({
  conversationId,
  user,
  organizationId,
  roomUrl,
  platform,
}: {
  conversationId: number;
  user: User;
  organizationId: number;
  roomUrl: string;
  platform: "android" | "ios";
}): Promise<void> {
  try {
    const userName = formatUserName(user);
    const result = await getOrCreateVpnSubscription(organizationId, user.id, userName, roomUrl);

    if (platform === "android") {
      await sendVpnBotMessage(
        conversationId,
        "Установи приложение olcbox из прикреплённого APK, затем добавь подписку по ссылке ниже.",
        organizationId,
        [getFileAttachment(ANDROID_FILE)],
      );
    } else {
      await sendVpnBotMessage(
        conversationId,
        `${IOS_WARNING}\n\nПосле установки добавь подписку по ссылке ниже.`,
        organizationId,
        [getFileAttachment(IOS_FILE)],
      );
    }

    const subscriptionText = result.isNew
      ? `Подписка готова:\n${result.subscriptionUrl}\n\nTelegram и WhatsApp пойдут через латвийский сервер, российские сайты — напрямую.\nСсылка привязана к первому устройству, на котором её активируют.`
      : `У вас уже есть подписка для этой комнаты:\n${result.subscriptionUrl}`;

    await sendVpnBotMessage(conversationId, subscriptionText, organizationId);
  } catch (err: any) {
    console.error("[VPN Bot] handle platform selection error:", err);
    const userMessage = err instanceof Error ? err.message : "Произошла ошибка. Попробуйте позже.";
    await sendVpnBotMessage(conversationId, userMessage, organizationId);
  }
}

export async function handleVpnBotCallback({
  bot,
  conversationId,
  messageId,
  callbackData,
  user,
  organizationId,
}: {
  bot: Bot;
  conversationId: number;
  messageId: number;
  callbackData: string;
  user: User;
  organizationId: number;
}): Promise<void> {
  if (callbackData === "platform:android" || callbackData === "platform:ios") {
    const pending = pendingPlatform.get(conversationId);
    if (!pending) {
      await sendVpnBotMessage(
        conversationId,
        "Сессия выбора платформы истекла. Пришли ссылку на встречу заново.",
        organizationId,
      );
      return;
    }
    const platform = callbackData === "platform:android" ? "android" : "ios";
    pendingPlatform.delete(conversationId);
    await processPlatformSelection({ conversationId, user, organizationId, roomUrl: pending.roomUrl, platform });
    return;
  }

  await sendVpnBotMessage(
    conversationId,
    `Неизвестное действие: ${callbackData}`,
    organizationId,
  );
}