import type { Bot } from "grammy";

import { resolveAckReaction } from "../agents/identity.js";
import { hasControlCommand } from "../auto-reply/command-detection.js";
import { normalizeCommandBody } from "../auto-reply/commands-registry.js";
import { formatInboundEnvelope, resolveEnvelopeFormatOptions } from "../auto-reply/envelope.js";
import {
  buildPendingHistoryContextFromMap,
  recordPendingHistoryEntryIfEnabled,
  type HistoryEntry,
} from "../auto-reply/reply/history.js";
import { finalizeInboundContext } from "../auto-reply/reply/inbound-context.js";
import { buildMentionRegexes, matchesMentionWithExplicit } from "../auto-reply/reply/mentions.js";
import { formatLocationText, toLocationContext } from "../channels/location.js";
import { recordInboundSession } from "../channels/session.js";
import { formatCliCommand } from "../cli/command-format.js";
import { readSessionUpdatedAt, resolveStorePath } from "../config/sessions.js";
import type { ClawdbotConfig } from "../config/config.js";
import type { DmPolicy, TelegramGroupConfig, TelegramTopicConfig } from "../config/types.js";
import { logVerbose, shouldLogVerbose } from "../globals.js";
import { recordChannelActivity } from "../infra/channel-activity.js";
import { resolveAgentRoute } from "../routing/resolve-route.js";
import { shouldAckReaction as shouldAckReactionGate } from "../channels/ack-reactions.js";
import { resolveMentionGatingWithBypass } from "../channels/mention-gating.js";
import { resolveControlCommandGate } from "../channels/command-gating.js";
import { logInboundDrop } from "../channels/logging.js";
import {
  buildGroupLabel,
  buildSenderLabel,
  buildSenderName,
  buildTelegramGroupFrom,
  buildTelegramGroupPeerId,
  buildTypingThreadParams,
  expandTextLinks,
  normalizeForwardedContext,
  describeReplyTarget,
  extractTelegramLocation,
  hasBotMention,
  resolveTelegramForumThreadId,
} from "./bot/helpers.js";
import {
  firstDefined,
  isSenderAllowed,
  normalizeAllowFromWithStore,
  resolveSenderAllowMatch,
} from "./bot-access.js";
import { upsertTelegramPairingRequest } from "./pairing-store.js";
import type { TelegramContext } from "./bot/types.js";

type TelegramMediaRef = { path: string; contentType?: string };

type TelegramMessageContextOptions = {
  forceWasMentioned?: boolean;
  messageIdOverride?: string;
};

type TelegramLogger = {
  info: (obj: Record<string, unknown>, msg: string) => void;
};

type ResolveTelegramGroupConfig = (
  chatId: string | number,
  messageThreadId?: number,
) => { groupConfig?: TelegramGroupConfig; topicConfig?: TelegramTopicConfig };

type ResolveGroupActivation = (params: {
  chatId: string | number;
  agentId?: string;
  messageThreadId?: number;
  sessionKey?: string;
}) => boolean | undefined;

type ResolveGroupRequireMention = (chatId: string | number) => boolean;

type BuildTelegramMessageContextParams = {
  primaryCtx: TelegramContext;
  allMedia: TelegramMediaRef[];
  storeAllowFrom: string[];
  options?: TelegramMessageContextOptions;
  bot: Bot;
  cfg: ClawdbotConfig;
  account: { accountId: string };
  historyLimit: number;
  groupHistories: Map<string, HistoryEntry[]>;
  dmPolicy: DmPolicy;
  allowFrom?: Array<string | number>;
  groupAllowFrom?: Array<string | number>;
  ackReactionScope: "off" | "group-mentions" | "group-all" | "direct" | "all";
  logger: TelegramLogger;
  resolveGroupActivation: ResolveGroupActivation;
  resolveGroupRequireMention: ResolveGroupRequireMention;
  resolveTelegramGroupConfig: ResolveTelegramGroupConfig;
};

export const buildTelegramMessageContext = async ({
  primaryCtx,
  allMedia,
  storeAllowFrom,
  options,
  bot,
  cfg,
  account,
  historyLimit,
  groupHistories,
  dmPolicy,
  allowFrom,
  groupAllowFrom,
  ackReactionScope,
  logger,
  resolveGroupActivation,
  resolveGroupRequireMention,
  resolveTelegramGroupConfig,
}: BuildTelegramMessageContextParams) => {
  const msg = primaryCtx.message;
  recordChannelActivity({
    channel: "telegram",
    accountId: account.accountId,
    direction: "inbound",
  });
  const chatId = msg.chat.id;
  const isGroup = msg.chat.type === "group" || msg.chat.type === "supergroup";
  const messageThreadId = (msg as { message_thread_id?: number }).message_thread_id;
  const isForum = (msg.chat as { is_forum?: boolean }).is_forum === true;
  const resolvedThreadId = resolveTelegramForumThreadId({
    isForum,
    messageThreadId,
  });
  const { groupConfig, topicConfig } = resolveTelegramGroupConfig(chatId, resolvedThreadId);
  const peerId = isGroup ? buildTelegramGroupPeerId(chatId, resolvedThreadId) : String(chatId);
  const route = resolveAgentRoute({
    cfg,
    channel: "telegram",
    accountId: account.accountId,
    peer: {
      kind: isGroup ? "group" : "dm",
      id: peerId,
    },
  });
  const mentionRegexes = buildMentionRegexes(cfg, route.agentId);
  const effectiveDmAllow = normalizeAllowFromWithStore({ allowFrom, storeAllowFrom });
  const groupAllowOverride = firstDefined(topicConfig?.allowFrom, groupConfig?.allowFrom);
  const effectiveGroupAllow = normalizeAllowFromWithStore({
    allowFrom: groupAllowOverride ?? groupAllowFrom,
    storeAllowFrom,
  });
  const hasGroupAllowOverride = typeof groupAllowOverride !== "undefined";

  if (isGroup && groupConfig?.enabled === false) {
    logVerbose(`Blocked telegram group ${chatId} (group disabled)`);
    return null;
  }
  if (isGroup && topicConfig?.enabled === false) {
    logVerbose(
      `Blocked telegram topic ${chatId} (${resolvedThreadId ?? "unknown"}) (topic disabled)`,
    );
    return null;
  }

  const sendTyping = async () => {
    await bot.api.sendChatAction(chatId, "typing", buildTypingThreadParams(resolvedThreadId));
  };

  const sendRecordVoice = async () => {
    try {
      await bot.api.sendChatAction(
        chatId,
        "record_voice",
        buildTypingThreadParams(resolvedThreadId),
      );
    } catch (err) {
      logVerbose(`telegram record_voice cue failed for chat ${chatId}: ${String(err)}`);
    }
  };

  // DM access control (secure defaults): "pairing" (default) / "allowlist" / "open" / "disabled"
  if (!isGroup) {
    if (dmPolicy === "disabled") return null;

    if (dmPolicy !== "open") {
      const candidate = String(chatId);
      const senderUsername = msg.from?.username ?? "";
      const allowMatch = resolveSenderAllowMatch({
        allow: effectiveDmAllow,
        senderId: candidate,
        senderUsername,
      });
      const allowMatchMeta = `matchKey=${allowMatch.matchKey ?? "none"} matchSource=${
        allowMatch.matchSource ?? "none"
      }`;
      const allowed =
        effectiveDmAllow.hasWildcard || (effectiveDmAllow.hasEntries && allowMatch.allowed);
      if (!allowed) {
        if (dmPolicy === "pairing") {
          try {
            const from = msg.from as
              | {
                  first_name?: string;
                  last_name?: string;
                  username?: string;
                  id?: number;
                }
              | undefined;
            const telegramUserId = from?.id ? String(from.id) : candidate;
            const { code, created } = await upsertTelegramPairingRequest({
              chatId: candidate,
              username: from?.username,
              firstName: from?.first_name,
              lastName: from?.last_name,
            });
            if (created) {
              logger.info(
                {
                  chatId: candidate,
                  username: from?.username,
                  firstName: from?.first_name,
                  lastName: from?.last_name,
                  matchKey: allowMatch.matchKey ?? "none",
                  matchSource: allowMatch.matchSource ?? "none",
                },
                "telegram pairing request",
              );
              await bot.api.sendMessage(
                chatId,
                [
                  "Clawdbot: access not configured.",
                  "",
                  `Your Telegram user id: ${telegramUserId}`,
                  "",
                  `Pairing code: ${code}`,
                  "",
                  "Ask the bot owner to approve with:",
                  formatCliCommand("clawdbot pairing approve telegram <code>"),
                ].join("\n"),
              );
            }
          } catch (err) {
            logVerbose(`telegram pairing reply failed for chat ${chatId}: ${String(err)}`);
          }
        } else {
          logVerbose(
            `Blocked unauthorized telegram sender ${candidate} (dmPolicy=${dmPolicy}, ${allowMatchMeta})`,
          );
        }
        return null;
      }
    }
  }

  const botUsername = primaryCtx.me?.username?.toLowerCase();
  const senderId = msg.from?.id ? String(msg.from.id) : "";
  const senderUsername = msg.from?.username ?? "";
  if (isGroup && hasGroupAllowOverride) {
    const allowed = isSenderAllowed({
      allow: effectiveGroupAllow,
      senderId,
      senderUsername,
    });
    if (!allowed) {
      logVerbose(
        `Blocked telegram group sender ${senderId || "unknown"} (group allowFrom override)`,
      );
      return null;
    }
  }
  const allowForCommands = isGroup ? effectiveGroupAllow : effectiveDmAllow;
  const senderAllowedForCommands = isSenderAllowed({
    allow: allowForCommands,
    senderId,
    senderUsername,
  });
  const useAccessGroups = cfg.commands?.useAccessGroups !== false;
  const hasControlCommandInMessage = hasControlCommand(msg.text ?? msg.caption ?? "", cfg, {
    botUsername,
  });
  const commandGate = resolveControlCommandGate({
    useAccessGroups,
    authorizers: [{ configured: allowForCommands.hasEntries, allowed: senderAllowedForCommands }],
    allowTextCommands: true,
    hasControlCommand: hasControlCommandInMessage,
  });
  const commandAuthorized = commandGate.commandAuthorized;
  const historyKey = isGroup ? buildTelegramGroupPeerId(chatId, resolvedThreadId) : undefined;

  let placeholder = "";
  if (msg.photo) placeholder = "<media:image>";
  else if (msg.video) placeholder = "<media:video>";
  else if (msg.audio || msg.voice) placeholder = "<media:audio>";
  else if (msg.document) placeholder = "<media:document>";

  const locationData = extractTelegramLocation(msg);
  const locationText = locationData ? formatLocationText(locationData) : undefined;
  const rawTextSource = msg.text ?? msg.caption ?? "";
  const rawText = expandTextLinks(rawTextSource, msg.entities ?? msg.caption_entities).trim();
  let rawBody = [rawText, locationText].filter(Boolean).join("\n").trim();
  if (!rawBody) rawBody = placeholder;
  if (!rawBody && allMedia.length === 0) return null;

  let bodyText = rawBody;
  if (!bodyText && allMedia.length > 0) {
    bodyText = `<media:image>${allMedia.length > 1 ? ` (${allMedia.length} images)` : ""}`;
  }
  const hasAnyMention = (msg.entities ?? msg.caption_entities ?? []).some(
    (ent) => ent.type === "mention",
  );
  const explicitlyMentioned = botUsername ? hasBotMention(msg, botUsername) : false;
  const computedWasMentioned = matchesMentionWithExplicit({
    text: msg.text ?? msg.caption ?? "",
    mentionRegexes,
    explicit: {
      hasAnyMention,
      isExplicitlyMentioned: explicitlyMentioned,
      canResolveExplicit: Boolean(botUsername),
    },
  });
  const wasMentioned = options?.forceWasMentioned === true ? true : computedWasMentioned;
  if (isGroup && commandGate.shouldBlock) {
    logInboundDrop({
      log: logVerbose,
      channel: "telegram",
      reason: "control command (unauthorized)",
      target: senderId ?? "unknown",
    });
    return null;
  }
  const activationOverride = resolveGroupActivation({
    chatId,
    messageThreadId: resolvedThreadId,
    sessionKey: route.sessionKey,
    agentId: route.agentId,
  });
  const baseRequireMention = resolveGroupRequireMention(chatId);
  const requireMention = firstDefined(
    activationOverride,
    topicConfig?.requireMention,
    groupConfig?.requireMention,
    baseRequireMention,
  );
  // Reply-chain detection: replying to a bot message acts like an implicit mention.
  const botId = primaryCtx.me?.id;
  const replyFromId = msg.reply_to_message?.from?.id;
  const implicitMention = botId != null && replyFromId === botId;
  const canDetectMention = Boolean(botUsername) || mentionRegexes.length > 0;
  const mentionGate = resolveMentionGatingWithBypass({
    isGroup,
    requireMention: Boolean(requireMention),
    canDetectMention,
    wasMentioned,
    implicitMention: isGroup && Boolean(requireMention) && implicitMention,
    hasAnyMention,
    allowTextCommands: true,
    hasControlCommand: hasControlCommandInMessage,
    commandAuthorized,
  });
  const effectiveWasMentioned = mentionGate.effectiveWasMentioned;
  if (isGroup && requireMention && canDetectMention) {
    if (mentionGate.shouldSkip) {
      logger.info({ chatId, reason: "no-mention" }, "skipping group message");
      recordPendingHistoryEntryIfEnabled({
        historyMap: groupHistories,
        historyKey: historyKey ?? "",
        limit: historyLimit,
        entry: historyKey
          ? {
              sender: buildSenderLabel(msg, senderId || chatId),
              body: rawBody,
              timestamp: msg.date ? msg.date * 1000 : undefined,
              messageId: typeof msg.message_id === "number" ? String(msg.message_id) : undefined,
            }
          : null,
      });
      return null;
    }
  }

  // ACK reactions
  const ackReaction = resolveAckReaction(cfg, route.agentId);
  const removeAckAfterReply = cfg.messages?.removeAckAfterReply ?? false;
  const shouldAckReaction = () =>
    Boolean(
      ackReaction &&
      shouldAckReactionGate({
        scope: ackReactionScope,
        isDirect: !isGroup,
        isGroup,
        isMentionableGroup: isGroup,
        requireMention: Boolean(requireMention),
        canDetectMention,
        effectiveWasMentioned,
        shouldBypassMention: mentionGate.shouldBypassMention,
      }),
    );
  const api = bot.api as unknown as {
    setMessageReaction?: (
      chatId: number | string,
      messageId: number,
      reactions: Array<{ type: "emoji"; emoji: string }>,
    ) => Promise<void>;
  };
  const reactionApi =
    typeof api.setMessageReaction === "function" ? api.setMessageReaction.bind(api) : null;
  const ackReactionPromise =
    shouldAckReaction() && msg.message_id && reactionApi
      ? reactionApi(chatId, msg.message_id, [{ type: "emoji", emoji: ackReaction }]).then(
          () => true,
          (err) => {
            logVerbose(`telegram react failed for chat ${chatId}: ${String(err)}`);
            return false;
          },
        )
      : null;

  const replyTarget = describeReplyTarget(msg);
  const forwardOrigin = normalizeForwardedContext(msg);
  const replySuffix = replyTarget
    ? `\n\n[Replying to ${replyTarget.sender}${
        replyTarget.id ? ` id:${replyTarget.id}` : ""
      }]\n${replyTarget.body}\n[/Replying]`
    : "";
  const forwardPrefix = forwardOrigin
    ? `[Forwarded from ${forwardOrigin.from}${
        forwardOrigin.date ? ` at ${new Date(forwardOrigin.date * 1000).toISOString()}` : ""
      }]\n`
    : "";
  const groupLabel = isGroup ? buildGroupLabel(msg, chatId, resolvedThreadId) : undefined;
  const senderName = buildSenderName(msg);
  const conversationLabel = isGroup
    ? (groupLabel ?? `group:${chatId}`)
    : buildSenderLabel(msg, senderId || chatId);
  const storePath = resolveStorePath(cfg.session?.store, {
    agentId: route.agentId,
  });
  const envelopeOptions = resolveEnvelopeFormatOptions(cfg);
  const previousTimestamp = readSessionUpdatedAt({
    storePath,
    sessionKey: route.sessionKey,
  });
  const body = formatInboundEnvelope({
    channel: "Telegram",
    from: conversationLabel,
    timestamp: msg.date ? msg.date * 1000 : undefined,
    body: `${forwardPrefix}${bodyText}${replySuffix}`,
    chatType: isGroup ? "group" : "direct",
    sender: {
      name: senderName,
      username: senderUsername || undefined,
      id: senderId || undefined,
    },
    previousTimestamp,
    envelope: envelopeOptions,
  });
  let combinedBody = body;
  if (isGroup && historyKey && historyLimit > 0) {
    combinedBody = buildPendingHistoryContextFromMap({
      historyMap: groupHistories,
      historyKey,
      limit: historyLimit,
      currentMessage: combinedBody,
      formatEntry: (entry) =>
        formatInboundEnvelope({
          channel: "Telegram",
          from: groupLabel ?? `group:${chatId}`,
          timestamp: entry.timestamp,
          body: `${entry.body} [id:${entry.messageId ?? "unknown"} chat:${chatId}]`,
          chatType: "group",
          senderLabel: entry.sender,
          envelope: envelopeOptions,
        }),
    });
  }

  const skillFilter = firstDefined(topicConfig?.skills, groupConfig?.skills);
  const systemPromptParts = [
    groupConfig?.systemPrompt?.trim() || null,
    topicConfig?.systemPrompt?.trim() || null,
  ].filter((entry): entry is string => Boolean(entry));
  const groupSystemPrompt =
    systemPromptParts.length > 0 ? systemPromptParts.join("\n\n") : undefined;
  const commandBody = normalizeCommandBody(rawBody, { botUsername });
  const ctxPayload = finalizeInboundContext({
    Body: combinedBody,
    RawBody: rawBody,
    CommandBody: commandBody,
    From: isGroup ? buildTelegramGroupFrom(chatId, resolvedThreadId) : `telegram:${chatId}`,
    To: `telegram:${chatId}`,
    SessionKey: route.sessionKey,
    AccountId: route.accountId,
    ChatType: isGroup ? "group" : "direct",
    ConversationLabel: conversationLabel,
    GroupSubject: isGroup ? (msg.chat.title ?? undefined) : undefined,
    GroupSystemPrompt: isGroup ? groupSystemPrompt : undefined,
    SenderName: senderName,
    SenderId: senderId || undefined,
    SenderUsername: senderUsername || undefined,
    Provider: "telegram",
    Surface: "telegram",
    MessageSid: options?.messageIdOverride ?? String(msg.message_id),
    ReplyToId: replyTarget?.id,
    ReplyToBody: replyTarget?.body,
    ReplyToSender: replyTarget?.sender,
    ForwardedFrom: forwardOrigin?.from,
    ForwardedFromType: forwardOrigin?.fromType,
    ForwardedFromId: forwardOrigin?.fromId,
    ForwardedFromUsername: forwardOrigin?.fromUsername,
    ForwardedFromTitle: forwardOrigin?.fromTitle,
    ForwardedFromSignature: forwardOrigin?.fromSignature,
    ForwardedDate: forwardOrigin?.date ? forwardOrigin.date * 1000 : undefined,
    Timestamp: msg.date ? msg.date * 1000 : undefined,
    WasMentioned: isGroup ? effectiveWasMentioned : undefined,
    MediaPath: allMedia[0]?.path,
    MediaType: allMedia[0]?.contentType,
    MediaUrl: allMedia[0]?.path,
    MediaPaths: allMedia.length > 0 ? allMedia.map((m) => m.path) : undefined,
    MediaUrls: allMedia.length > 0 ? allMedia.map((m) => m.path) : undefined,
    MediaTypes:
      allMedia.length > 0
        ? (allMedia.map((m) => m.contentType).filter(Boolean) as string[])
        : undefined,
    ...(locationData ? toLocationContext(locationData) : undefined),
    CommandAuthorized: commandAuthorized,
    MessageThreadId: resolvedThreadId,
    IsForum: isForum,
    // Originating channel for reply routing.
    OriginatingChannel: "telegram" as const,
    OriginatingTo: `telegram:${chatId}`,
  });

  await recordInboundSession({
    storePath,
    sessionKey: ctxPayload.SessionKey ?? route.sessionKey,
    ctx: ctxPayload,
    updateLastRoute: !isGroup
      ? {
          sessionKey: route.mainSessionKey,
          channel: "telegram",
          to: String(chatId),
          accountId: route.accountId,
        }
      : undefined,
    onRecordError: (err) => {
      logVerbose(`telegram: failed updating session meta: ${String(err)}`);
    },
  });

  if (replyTarget && shouldLogVerbose()) {
    const preview = replyTarget.body.replace(/\s+/g, " ").slice(0, 120);
    logVerbose(
      `telegram reply-context: replyToId=${replyTarget.id} replyToSender=${replyTarget.sender} replyToBody="${preview}"`,
    );
  }

  if (forwardOrigin && shouldLogVerbose()) {
    logVerbose(
      `telegram forward-context: forwardedFrom="${forwardOrigin.from}" type=${forwardOrigin.fromType}`,
    );
  }

  if (shouldLogVerbose()) {
    const preview = body.slice(0, 200).replace(/\n/g, "\\n");
    const mediaInfo = allMedia.length > 1 ? ` mediaCount=${allMedia.length}` : "";
    const topicInfo = resolvedThreadId != null ? ` topic=${resolvedThreadId}` : "";
    logVerbose(
      `telegram inbound: chatId=${chatId} from=${ctxPayload.From} len=${body.length}${mediaInfo}${topicInfo} preview="${preview}"`,
    );
  }

  return {
    ctxPayload,
    primaryCtx,
    msg,
    chatId,
    isGroup,
    resolvedThreadId,
    isForum,
    historyKey,
    historyLimit,
    groupHistories,
    route,
    skillFilter,
    sendTyping,
    sendRecordVoice,
    ackReactionPromise,
    reactionApi,
    removeAckAfterReply,
    accountId: account.accountId,
  };
};