import type { OpenClawPluginApi } from "openclaw/plugin-sdk";
import { evaluateDecision, type Decision, type DirigentConfig } from "../rules.js";
import { checkTurn } from "../turn-manager.js";
import { deriveDecisionInputFromPrompt } from "../decision-input.js";

type DebugConfig = {
  enableDebugLogs?: boolean;
  debugLogChannelIds?: string[];
};

type DecisionRecord = {
  decision: Decision;
  createdAt: number;
  needsRestore?: boolean;
};

type BeforeModelResolveDeps = {
  api: OpenClawPluginApi;
  baseConfig: DirigentConfig;
  sessionDecision: Map<string, DecisionRecord>;
  sessionAllowed: Map<string, boolean>;
  sessionChannelId: Map<string, string>;
  sessionAccountId: Map<string, string>;
  recordDiscussionSession?: (channelId: string, sessionKey: string) => void;
  forceNoReplySessions: Set<string>;
  policyState: { channelPolicies: Record<string, unknown> };
  DECISION_TTL_MS: number;
  ensurePolicyStateLoaded: (api: OpenClawPluginApi, config: DirigentConfig) => void;
  resolveAccountId: (api: OpenClawPluginApi, agentId: string) => string | undefined;
  pruneDecisionMap: () => void;
  shouldDebugLog: (config: DirigentConfig & DebugConfig, channelId?: string) => boolean;
  ensureTurnOrder: (api: OpenClawPluginApi, channelId: string) => Promise<void> | void;
  isMultiMessageMode: (channelId: string) => boolean;
  discussionService?: {
    isClosedDiscussion: (channelId: string) => boolean;
  };
};

export function registerBeforeModelResolveHook(deps: BeforeModelResolveDeps): void {
  const {
    api,
    baseConfig,
    sessionDecision,
    sessionAllowed,
    sessionChannelId,
    sessionAccountId,
    recordDiscussionSession,
    forceNoReplySessions,
    policyState,
    DECISION_TTL_MS,
    ensurePolicyStateLoaded,
    resolveAccountId,
    pruneDecisionMap,
    shouldDebugLog,
    ensureTurnOrder,
    isMultiMessageMode,
    discussionService,
  } = deps;

  api.on("before_model_resolve", async (event, ctx) => {
    const key = ctx.sessionKey;
    if (!key) return;

    const live = baseConfig as DirigentConfig & DebugConfig;
    ensurePolicyStateLoaded(api, live);

    if (forceNoReplySessions.has(key)) {
      return {
        model: ctx.model,
        provider: ctx.provider,
        noReply: true,
      };
    }

    const prompt = ((event as Record<string, unknown>).prompt as string) || "";

    if (live.enableDebugLogs) {
      api.logger.info(
        `dirigent: DEBUG_BEFORE_MODEL_RESOLVE ctx=${JSON.stringify({ sessionKey: ctx.sessionKey, messageProvider: ctx.messageProvider, agentId: ctx.agentId })} ` +
          `promptPreview=${prompt.slice(0, 300)}`,
      );
    }

    const derived = deriveDecisionInputFromPrompt({
      prompt,
      messageProvider: ctx.messageProvider,
      sessionKey: key,
      ctx: ctx as Record<string, unknown>,
      event: event as Record<string, unknown>,
    });

    const hasConvMarker = prompt.includes("Conversation info (untrusted metadata):");
    if (live.discordOnly !== false && (!hasConvMarker || derived.channel !== "discord")) return;

    if (derived.channelId) {
      sessionChannelId.set(key, derived.channelId);
      recordDiscussionSession?.(derived.channelId, key);
      if (discussionService?.isClosedDiscussion(derived.channelId)) {
        sessionAllowed.set(key, false);
        api.logger.info(`dirigent: before_model_resolve forcing no-reply for closed discussion channel=${derived.channelId} session=${key}`);
        return {
          model: ctx.model,
          provider: ctx.provider,
          noReply: true,
        };
      }
      
      if (isMultiMessageMode(derived.channelId)) {
        sessionAllowed.set(key, false);
        api.logger.info(`dirigent: before_model_resolve forcing no-reply for multi-message mode channel=${derived.channelId} session=${key}`);
        return {
          model: ctx.model,
          provider: ctx.provider,
          noReply: true,
        };
      }
    }
    const resolvedAccountId = resolveAccountId(api, ctx.agentId || "");
    if (resolvedAccountId) {
      sessionAccountId.set(key, resolvedAccountId);
    }

    let rec = sessionDecision.get(key);
    if (!rec || Date.now() - rec.createdAt > DECISION_TTL_MS) {
      if (rec) sessionDecision.delete(key);
      const decision = evaluateDecision({
        config: live,
        channel: derived.channel,
        channelId: derived.channelId,
        channelPolicies: policyState.channelPolicies as Record<string, any>,
        senderId: derived.senderId,
        content: derived.content,
      });
      rec = { decision, createdAt: Date.now() };
      sessionDecision.set(key, rec);
      pruneDecisionMap();
      if (shouldDebugLog(live, derived.channelId)) {
        api.logger.info(
          `dirigent: debug before_model_resolve recompute session=${key} ` +
            `channel=${derived.channel} channelId=${derived.channelId ?? ""} senderId=${derived.senderId ?? ""} ` +
            `convSenderId=${String((derived.conv as Record<string, unknown>).sender_id ?? "")} ` +
            `convSender=${String((derived.conv as Record<string, unknown>).sender ?? "")} ` +
            `convChannelId=${String((derived.conv as Record<string, unknown>).channel_id ?? "")} ` +
            `decision=${decision.reason} shouldNoReply=${decision.shouldUseNoReply} shouldInject=${decision.shouldInjectEndMarkerPrompt}`,
        );
      }
    }

    if (derived.channelId) {
      await ensureTurnOrder(api, derived.channelId);
      const accountId = resolveAccountId(api, ctx.agentId || "");
      if (accountId) {
        const turnCheck = checkTurn(derived.channelId, accountId);
        if (!turnCheck.allowed) {
          sessionAllowed.set(key, false);
          api.logger.info(
            `dirigent: before_model_resolve blocking out-of-turn speaker session=${key} channel=${derived.channelId} accountId=${accountId} currentSpeaker=${turnCheck.currentSpeaker}`,
          );
          return {
            model: ctx.model,
            provider: ctx.provider,
            noReply: true,
          };
        }
        sessionAllowed.set(key, true);
      }
    }

    if (!rec.decision.shouldUseNoReply) return;

    const out: Record<string, unknown> = { noReply: true };
    if (rec.decision.provider) out.provider = rec.decision.provider;
    if (rec.decision.model) out.model = rec.decision.model;
    return out;
  });
}