import { Queue, Worker, type ConnectionOptions, type Job } from "bullmq";
import { Prisma } from "@prisma/client";
import { prisma } from "./utils/prisma";

type JsonObject = Record<string, unknown>;

type OmniInboundEnvelopeV1 = {
  version: 1;
  idempotencyKey: string;
  provider: string;
  channel: "TELEGRAM" | "WHATSAPP" | "INSTAGRAM" | "PHONE" | "EMAIL" | "INTERNAL";
  direction: "IN" | "OUT";
  providerEventId: string;
  providerMessageId: string | null;
  eventType: string;
  occurredAt: string;
  receivedAt: string;
  payloadRaw: unknown;
  payloadNormalized: {
    threadExternalId: string | null;
    contactExternalId: string | null;
    text: string | null;
    businessConnectionId: string | null;
    updateId?: string | null;
    [key: string]: unknown;
  };
};

export const RECEIVER_FLOW_QUEUE_NAME = (process.env.RECEIVER_FLOW_QUEUE_NAME || "receiver.flow").trim();
const TELEGRAM_PLACEHOLDER_PREFIX = "Telegram ";
const TELEGRAM_AUDIO_FILE_MARKER = "tg-file:";
const TELEGRAM_WAVE_BINS = 96;

function redisConnectionFromEnv(): ConnectionOptions {
  const raw = (process.env.REDIS_URL || "redis://localhost:6379").trim();
  const parsed = new URL(raw);
  return {
    host: parsed.hostname,
    port: parsed.port ? Number(parsed.port) : 6379,
    username: parsed.username ? decodeURIComponent(parsed.username) : undefined,
    password: parsed.password ? decodeURIComponent(parsed.password) : undefined,
    db: parsed.pathname && parsed.pathname !== "/" ? Number(parsed.pathname.slice(1)) : undefined,
    maxRetriesPerRequest: null,
  };
}

function normalizeText(input: unknown) {
  const t = String(input ?? "").trim();
  return t || "[no text]";
}

type TelegramInboundMedia = {
  kind: "voice" | "audio" | "video_note" | null;
  fileId: string | null;
  durationSec: number | null;
  label: string | null;
};

function parseTelegramInboundMedia(normalized: OmniInboundEnvelopeV1["payloadNormalized"]): TelegramInboundMedia {
  const kindRaw = String(normalized.mediaKind ?? "").trim().toLowerCase();
  const kind: TelegramInboundMedia["kind"] =
    kindRaw === "voice" || kindRaw === "audio" || kindRaw === "video_note"
      ? kindRaw
      : null;

  const fileId = asString(normalized.mediaFileId);
  const durationRaw = normalized.mediaDurationSec;
  const durationParsed =
    typeof durationRaw === "number"
      ? durationRaw
      : typeof durationRaw === "string"
        ? Number(durationRaw)
        : Number.NaN;
  const durationSec =
    Number.isFinite(durationParsed) && durationParsed > 0
      ? Math.max(1, Math.round(durationParsed))
      : null;

  const label = asString(normalized.mediaTitle);
  return { kind, fileId, durationSec, label };
}

function fallbackTextFromMedia(media: TelegramInboundMedia) {
  if (!media.kind) return null;
  if (media.kind === "voice") return "[voice message]";
  if (media.kind === "video_note") return "[video note]";
  if (media.label) return `[audio] ${media.label}`;
  return "[audio]";
}

function buildFallbackWaveform(seedText: string, bins = TELEGRAM_WAVE_BINS) {
  let seed = 0;
  for (let i = 0; i < seedText.length; i += 1) {
    seed = (seed * 33 + seedText.charCodeAt(i)) >>> 0;
  }

  const random = () => {
    seed = (seed * 1664525 + 1013904223) >>> 0;
    return seed / 0xffffffff;
  };

  const out: number[] = [];
  let smooth = 0;
  for (let i = 0; i < bins; i += 1) {
    const t = i / Math.max(1, bins - 1);
    const burst = Math.max(0, Math.sin(t * Math.PI * (2 + (seedText.length % 5))));
    const noise = (random() * 2 - 1) * 0.6;
    smooth = smooth * 0.72 + noise * 0.28;
    const value = Math.max(0.06, Math.min(1, 0.12 + Math.abs(smooth) * 0.42 + burst * 0.4));
    out.push(Number(value.toFixed(4)));
  }
  return out;
}

function buildWaveformFromBytes(bytes: Uint8Array, bins = TELEGRAM_WAVE_BINS) {
  if (!bytes.length) return [];
  const bucketSize = Math.max(1, Math.ceil(bytes.length / bins));
  const raw = new Array<number>(bins).fill(0);

  for (let i = 0; i < bins; i += 1) {
    const start = i * bucketSize;
    const end = Math.min(bytes.length, start + bucketSize);
    if (start >= end) continue;

    let energy = 0;
    for (let j = start; j < end; j += 1) {
      energy += Math.abs(bytes[j] - 128) / 128;
    }
    raw[i] = energy / (end - start);
  }

  const smooth: number[] = [];
  let prev = 0;
  for (const value of raw) {
    prev = prev * 0.78 + value * 0.22;
    smooth.push(prev);
  }

  const maxValue = Math.max(...smooth, 0);
  if (maxValue <= 0) return [];

  return smooth.map((value) => {
    const normalized = value / maxValue;
    const mapped = Math.max(0.06, Math.min(1, normalized * 0.9 + 0.06));
    return Number(mapped.toFixed(4));
  });
}

async function fetchTelegramFileBytes(fileId: string) {
  const token = String(process.env.TELEGRAM_BOT_TOKEN ?? "").trim();
  if (!token) return null;

  const base = String(process.env.TELEGRAM_API_BASE ?? "https://api.telegram.org").replace(/\/+$/, "");

  const metaRes = await fetch(`${base}/bot${token}/getFile`, {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({ file_id: fileId }),
  });
  const metaJson = (await metaRes.json().catch(() => null)) as
    | { ok?: boolean; result?: { file_path?: string } }
    | null;
  const filePath = String(metaJson?.result?.file_path ?? "").trim();
  if (!metaRes.ok || !metaJson?.ok || !filePath) return null;

  const fileRes = await fetch(`${base}/file/bot${token}/${filePath}`);
  if (!fileRes.ok) return null;
  return new Uint8Array(await fileRes.arrayBuffer());
}

async function resolveInboundWaveform(media: TelegramInboundMedia, text: string) {
  const fallback = buildFallbackWaveform(`${media.fileId ?? "none"}:${media.durationSec ?? "0"}:${text}`);
  const fileId = media.fileId;
  if (!fileId) return fallback;

  try {
    const bytes = await fetchTelegramFileBytes(fileId);
    if (!bytes?.length) return fallback;
    const fromFile = buildWaveformFromBytes(bytes);
    return fromFile.length ? fromFile : fallback;
  } catch {
    return fallback;
  }
}

function parseOccurredAt(input: string | null | undefined) {
  const d = new Date(String(input ?? ""));
  if (Number.isNaN(d.getTime())) return new Date();
  return d;
}

function asString(input: unknown) {
  if (typeof input !== "string") return null;
  const trimmed = input.trim();
  return trimmed || null;
}

function safeDirection(input: unknown): "IN" | "OUT" {
  return input === "OUT" ? "OUT" : "IN";
}

function isUniqueConstraintError(error: unknown) {
  return error instanceof Prisma.PrismaClientKnownRequestError && error.code === "P2002";
}

type ContactProfile = {
  displayName: string;
  avatarUrl: string | null;
};

function buildContactProfile(
  normalized: OmniInboundEnvelopeV1["payloadNormalized"],
  externalContactId: string,
): ContactProfile {
  // Use only normalized contact-* fields (counterparty), avoid sender/chat fallbacks
  // to prevent accidental renames to the business owner name on OUT events.
  const firstName = asString(normalized.contactFirstName);
  const lastName = asString(normalized.contactLastName);
  const username = asString(normalized.contactUsername);
  const title = asString(normalized.contactTitle);

  const fullName = [firstName, lastName].filter(Boolean).join(" ");
  const displayName =
    fullName ||
    (username ? `@${username.replace(/^@/, "")}` : null) ||
    title ||
    `${TELEGRAM_PLACEHOLDER_PREFIX}${externalContactId}`;

  return {
    displayName,
    avatarUrl: asString(normalized.contactAvatarUrl),
  };
}

async function maybeHydrateContact(contactId: string, profile: ContactProfile) {
  const current = await prisma.contact.findUnique({
    where: { id: contactId },
    select: { name: true, avatarUrl: true },
  });
  if (!current) return;

  const updates: Prisma.ContactUpdateInput = {};
  const currentName = asString(current.name);
  const nextName = asString(profile.displayName);

  if (nextName && (!currentName || currentName.startsWith(TELEGRAM_PLACEHOLDER_PREFIX)) && currentName !== nextName) {
    updates.name = nextName;
  }

  const currentAvatar = asString(current.avatarUrl);
  if (profile.avatarUrl && !currentAvatar) {
    updates.avatarUrl = profile.avatarUrl;
  }

  if (Object.keys(updates).length === 0) return;
  await prisma.contact.update({
    where: { id: contactId },
    data: updates,
  });
}

async function resolveTeamId(env: OmniInboundEnvelopeV1) {
  const n = env.payloadNormalized ?? ({} as OmniInboundEnvelopeV1["payloadNormalized"]);
  const bcId = String(n.businessConnectionId ?? "").trim();
  if (bcId) {
    const linked = await prisma.telegramBusinessConnection.findFirst({
      where: { businessConnectionId: bcId },
      orderBy: { updatedAt: "desc" },
      select: { teamId: true },
    });
    if (linked?.teamId) return linked.teamId;
  }

  const externalContactId = String(n.contactExternalId ?? n.threadExternalId ?? "").trim();
  if (externalContactId) {
    const pseudo = `link:${externalContactId}`;
    const linked = await prisma.telegramBusinessConnection.findFirst({
      where: { businessConnectionId: pseudo },
      orderBy: { updatedAt: "desc" },
      select: { teamId: true },
    });
    if (linked?.teamId) return linked.teamId;
  }

  const fallbackTeamId = String(process.env.DEFAULT_TEAM_ID || "").trim();
  if (fallbackTeamId) return fallbackTeamId;

  const demo = await prisma.team.findFirst({
    where: { id: "demo-team" },
    select: { id: true },
  });
  return demo?.id ?? null;
}

async function resolveContact(input: {
  teamId: string;
  externalContactId: string;
  profile: ContactProfile;
}) {
  const existingIdentity = await prisma.omniContactIdentity.findFirst({
    where: {
      teamId: input.teamId,
      channel: "TELEGRAM",
      externalId: input.externalContactId,
    },
    select: { contactId: true },
  });
  if (existingIdentity?.contactId) {
    await maybeHydrateContact(existingIdentity.contactId, input.profile);
    return existingIdentity.contactId;
  }

  const contact = await prisma.contact.create({
    data: {
      teamId: input.teamId,
      name: input.profile.displayName,
      avatarUrl: input.profile.avatarUrl,
    },
    select: { id: true },
  });

  try {
    await prisma.omniContactIdentity.create({
      data: {
        teamId: input.teamId,
        contactId: contact.id,
        channel: "TELEGRAM",
        externalId: input.externalContactId,
      },
    });
  } catch (error) {
    if (!isUniqueConstraintError(error)) throw error;

    const concurrentIdentity = await prisma.omniContactIdentity.findFirst({
      where: {
        teamId: input.teamId,
        channel: "TELEGRAM",
        externalId: input.externalContactId,
      },
      select: { contactId: true },
    });
    if (!concurrentIdentity?.contactId) throw error;

    await prisma.contact.delete({ where: { id: contact.id } }).catch(() => undefined);
    await maybeHydrateContact(concurrentIdentity.contactId, input.profile);
    return concurrentIdentity.contactId;
  }

  return contact.id;
}

async function upsertThread(input: {
  teamId: string;
  contactId: string;
  externalChatId: string;
  businessConnectionId: string | null;
  title: string | null;
}) {
  const existing = await prisma.omniThread.findFirst({
    where: {
      teamId: input.teamId,
      channel: "TELEGRAM",
      externalChatId: input.externalChatId,
      businessConnectionId: input.businessConnectionId,
    },
    select: { id: true, title: true },
  });

  if (existing) {
    const data: Prisma.OmniThreadUpdateInput = {
      contact: { connect: { id: input.contactId } },
    };
    if (input.title && !existing.title) {
      data.title = input.title;
    }

    await prisma.omniThread.update({
      where: { id: existing.id },
      data,
    });
    return existing;
  }

  try {
    return await prisma.omniThread.create({
      data: {
        teamId: input.teamId,
        contactId: input.contactId,
        channel: "TELEGRAM",
        externalChatId: input.externalChatId,
        businessConnectionId: input.businessConnectionId,
        title: input.title,
      },
      select: { id: true },
    });
  } catch (error) {
    if (!isUniqueConstraintError(error)) throw error;

    const concurrentThread = await prisma.omniThread.findFirst({
      where: {
        teamId: input.teamId,
        channel: "TELEGRAM",
        externalChatId: input.externalChatId,
        businessConnectionId: input.businessConnectionId,
      },
      select: { id: true },
    });
    if (!concurrentThread) throw error;

    await prisma.omniThread.update({
      where: { id: concurrentThread.id },
      data: { contact: { connect: { id: input.contactId } } },
    });
    return concurrentThread;
  }
}

async function upsertContactInbox(input: {
  teamId: string;
  contactId: string;
  channel: "TELEGRAM";
  sourceExternalId: string;
  title: string | null;
}) {
  return prisma.contactInbox.upsert({
    where: {
      teamId_channel_sourceExternalId: {
        teamId: input.teamId,
        channel: input.channel,
        sourceExternalId: input.sourceExternalId,
      },
    },
    create: {
      teamId: input.teamId,
      contactId: input.contactId,
      channel: input.channel,
      sourceExternalId: input.sourceExternalId,
      title: input.title,
    },
    update: {
      contactId: input.contactId,
      ...(input.title ? { title: input.title } : {}),
    },
    select: { id: true },
  });
}

async function handleReadBusinessMessage(env: OmniInboundEnvelopeV1) {
  const teamId = await resolveTeamId(env);
  if (!teamId) return;

  const n = env.payloadNormalized ?? ({} as OmniInboundEnvelopeV1["payloadNormalized"]);
  const externalChatId = String(n.threadExternalId ?? n.contactExternalId ?? "").trim();
  if (!externalChatId) return;

  const thread = await prisma.omniThread.findFirst({
    where: { teamId, channel: "TELEGRAM", externalChatId },
    select: { contactId: true },
  });
  if (!thread) return;

  const teamUsers = await prisma.teamMember.findMany({
    where: { teamId },
    select: { userId: true },
  });
  const now = new Date();
  // ContactThreadRead is not in omni_chat's Prisma schema, use raw upsert
  await Promise.all(
    teamUsers.map((u) =>
      prisma.$executeRaw`
        INSERT INTO "ContactThreadRead" ("id", "teamId", "userId", "contactId", "readAt")
        VALUES (gen_random_uuid(), ${teamId}, ${u.userId}, ${thread.contactId}, ${now})
        ON CONFLICT ("userId", "contactId") DO UPDATE SET "readAt" = ${now}
      `,
    ),
  );
  console.log(`[omni_chat] read_business_message: marked contact ${thread.contactId} as read for ${teamUsers.length} users`);
}

async function ingestInbound(env: OmniInboundEnvelopeV1) {
  if (env.channel !== "TELEGRAM") return;

  if (env.eventType === "read_business_message") {
    await handleReadBusinessMessage(env);
    return;
  }

  const teamId = await resolveTeamId(env);
  if (!teamId) {
    console.warn("[omni_chat] skip inbound: team not resolved", env.providerEventId);
    return;
  }

  const n = env.payloadNormalized ?? ({} as OmniInboundEnvelopeV1["payloadNormalized"]);
  const externalContactId = String(n.contactExternalId ?? n.threadExternalId ?? "").trim();
  const externalChatId = String(n.threadExternalId ?? n.contactExternalId ?? "").trim();

  if (!externalContactId || !externalChatId) {
    console.warn("[omni_chat] skip inbound: missing contact/chat ids", env.providerEventId);
    return;
  }

  const businessConnectionId = String(n.businessConnectionId ?? "").trim() || null;
  const media = parseTelegramInboundMedia(n);
  const text = normalizeText(asString(n.text) ?? fallbackTextFromMedia(media));
  const isAudioLike = Boolean(media.fileId) && (media.kind === "voice" || media.kind === "audio" || media.kind === "video_note");
  const contactMessageKind: "MESSAGE" | "CALL" = isAudioLike ? "CALL" : "MESSAGE";
  const contactMessageAudioUrl = isAudioLike ? `${TELEGRAM_AUDIO_FILE_MARKER}${media.fileId}` : null;
  const waveformPeaks = isAudioLike ? await resolveInboundWaveform(media, text) : null;
  const occurredAt = parseOccurredAt(env.occurredAt);
  const direction = safeDirection(env.direction);
  const contactProfile = buildContactProfile(n, externalContactId);

  const contactId = await resolveContact({
    teamId,
    externalContactId,
    profile: contactProfile,
  });
  const thread = await upsertThread({
    teamId,
    contactId,
    externalChatId,
    businessConnectionId,
    title: asString(n.chatTitle),
  });
  const inbox = await upsertContactInbox({
    teamId,
    contactId,
    channel: "TELEGRAM",
    sourceExternalId: externalChatId,
    title: asString(n.chatTitle),
  });
  const rawEnvelope = {
    version: env.version,
    source: "omni_chat.receiver",
    provider: env.provider,
    channel: env.channel,
    direction,
    providerEventId: env.providerEventId,
    receivedAt: env.receivedAt,
    occurredAt: occurredAt.toISOString(),
    normalized: {
      text,
      threadExternalId: externalChatId,
      contactExternalId: externalContactId,
      businessConnectionId,
      mediaKind: media.kind,
      mediaFileId: media.fileId,
      mediaDurationSec: media.durationSec,
      mediaLabel: media.label,
    },
    payloadNormalized: n,
    payloadRaw: (env.payloadRaw ?? null) as Prisma.InputJsonValue,
  } as Prisma.InputJsonValue;

  if (env.providerMessageId) {
    await prisma.omniMessage.upsert({
      where: {
        threadId_providerMessageId: {
          threadId: thread.id,
          providerMessageId: env.providerMessageId,
        },
      },
      create: {
        teamId,
        contactId,
        threadId: thread.id,
        direction,
        channel: "TELEGRAM",
        status: "DELIVERED",
        text,
        providerMessageId: env.providerMessageId,
        providerUpdateId: String((n.updateId as string | null | undefined) ?? env.providerEventId),
        rawJson: rawEnvelope,
        occurredAt,
      },
      update: {
        text,
        providerUpdateId: String((n.updateId as string | null | undefined) ?? env.providerEventId),
        rawJson: rawEnvelope,
        occurredAt,
      },
    });
  } else {
    await prisma.omniMessage.create({
      data: {
        teamId,
        contactId,
        threadId: thread.id,
        direction,
        channel: "TELEGRAM",
        status: "DELIVERED",
        text,
        providerMessageId: null,
        providerUpdateId: String((n.updateId as string | null | undefined) ?? env.providerEventId),
        rawJson: rawEnvelope,
        occurredAt,
      },
    });
  }

  await prisma.contactMessage.create({
    data: {
      contactId,
      contactInboxId: inbox.id,
      kind: contactMessageKind,
      direction,
      channel: "TELEGRAM",
      content: text,
      audioUrl: contactMessageAudioUrl,
      durationSec: media.durationSec,
      ...(waveformPeaks ? { waveformJson: waveformPeaks as Prisma.InputJsonValue } : {}),
      occurredAt,
    },
  });
}

let workerInstance: Worker<OmniInboundEnvelopeV1, unknown, "ingest"> | null = null;

export function startReceiverWorker() {
  if (workerInstance) return workerInstance;

  const worker = new Worker<OmniInboundEnvelopeV1, unknown, "ingest">(
    RECEIVER_FLOW_QUEUE_NAME,
    async (job) => {
      await ingestInbound(job.data);
    },
    {
      connection: redisConnectionFromEnv(),
      concurrency: Number(process.env.OMNI_CHAT_WORKER_CONCURRENCY || 4),
    },
  );

  worker.on("failed", (job: Job<OmniInboundEnvelopeV1, unknown, "ingest"> | undefined, err: Error) => {
    console.error(`[omni_chat] receiver job failed id=${job?.id || "unknown"}: ${err?.message || err}`);
  });

  workerInstance = worker;
  return worker;
}

export async function closeReceiverWorker() {
  if (!workerInstance) return;
  await workerInstance.close();
  workerInstance = null;
}

export function receiverQueue() {
  return new Queue<OmniInboundEnvelopeV1, unknown, "ingest">(RECEIVER_FLOW_QUEUE_NAME, {
    connection: redisConnectionFromEnv(),
  });
}