import "dotenv/config";
import { Queue, Worker, type Job } from "bullmq";
import IORedis from "ioredis";
import { createContext } from "./context.js";
import { processScanJob } from "./processors/scans.js";
import { processModerateRecipe } from "./processors/moderation.js";
import { processTranslateRecipe } from "./processors/translation.js";
import { processGenerateWeekPlan } from "./processors/weekplan.js";
import {
  processExpiryNotifications,
  processMealBoxReminders,
  processMemorySync,
  processOutbox,
  processRetention,
  processStoreNotification,
  processSubscriptionSweep,
  processTrainingExport,
} from "./processors/maintenance.js";

/**
 * workern. Konsumerar kön "<slug>-jobs" (spec §50):
 *   App → signed S3 upload → API job → worker → AAMOS → result → app
 *
 * Jobbnamn = jobbtyp (spec §54). Deterministiska jobb rör aldrig AAMOS;
 * AI-jobb går alltid via de typade kontrakten i @app/ai-contracts.
 */

import { JOB_QUEUE_NAME as QUEUE_NAME } from "@app/shared-types";
const connection = new IORedis(process.env.REDIS_URL ?? "redis://localhost:6379", {
  maxRetriesPerRequest: null,
});
const ctx = createContext();

const worker = new Worker(
  QUEUE_NAME,
  async (job: Job) => {
    const data = job.data as Record<string, unknown>;
    const jobType = (data.jobType as string) ?? job.name;
    log(`▶ ${jobType} (${job.id})`);

    switch (jobType) {
      case "ANALYZE_FRIDGE_IMAGE":
      case "ANALYZE_PANTRY_IMAGE":
      case "ANALYZE_MEAL_IMAGE":
      case "READ_RECEIPT":
      case "READ_NUTRITION_LABEL":
      case "READ_EXPIRY_DATE":
        return processScanJob(ctx, String(data.scanJobId));

      case "MODERATE_RECIPE":
        return processModerateRecipe(ctx, String(data.recipeId));

      case "TRANSLATE_RECIPE":
        return processTranslateRecipe(ctx, {
          recipeId: String(data.recipeId),
          targetLanguageTag: String(data.targetLanguageTag),
        });

      case "GENERATE_WEEK_PLAN":
        return processGenerateWeekPlan(ctx, data as never);

      case "PROCESS_STORE_NOTIFICATION":
        return processStoreNotification(ctx, String(data.notificationId));

      case "SEND_EXPIRY_NOTIFICATION": {
        const expiry = await processExpiryNotifications(ctx);
        const boxes = await processMealBoxReminders(ctx);
        log(`Notiser: ${expiry} bäst före, ${boxes} matlådor`);
        return;
      }

      case "UPDATE_USER_MEMORY": {
        const updates = await processMemorySync(ctx);
        log(`Minnesuppdateringar: ${updates}`);
        return;
      }

      case "VERIFY_SUBSCRIPTION": {
        const expired = await processSubscriptionSweep(ctx);
        log(`Prenumerationssvep: ${expired} markerade som utgångna`);
        return;
      }

      case "BUILD_TRAINING_SAMPLE": {
        const exported = await processTrainingExport(ctx);
        log(`Träningsexport: ${exported} korrigeringar (med samtycke)`);
        return;
      }

      case "RUN_RETENTION": {
        const removed = await processRetention(ctx);
        log(`Retention: ${JSON.stringify(removed)}`);
        return;
      }

      case "PUBLISH_OUTBOX": {
        const published = await processOutbox(ctx);
        if (published > 0) log(`Outbox: ${published} events publicerade`);
        return;
      }

      // Deterministiska/planerade jobb som inte kräver egen processor ännu
      case "NORMALIZE_PRODUCTS":
      case "DEDUPLICATE_INVENTORY":
      case "CALCULATE_NUTRITION":
      case "GENERATE_RECIPE_OPTIONS":
      case "RANK_RECIPES":
      case "RUN_AI_EVALUATION":
        log(`${jobType}: hanteras synkront i API:t eller aktiveras i senare fas`);
        return;

      default:
        throw new Error(`Okänd jobbtyp: ${jobType}`);
    }
  },
  {
    connection,
    concurrency: Number(process.env.WORKER_CONCURRENCY ?? 5),
  },
);

worker.on("completed", (job) => log(`✓ ${job.name} (${job.id})`));
worker.on("failed", (job, err) => {
  console.error(`✗ ${job?.name} (${job?.id}): ${err.message}`);
  void alertWebhook(`Worker-jobb misslyckades: ${job?.name} (${job?.id}): ${err.message}`);
});

/** Larm till valfri webhook (Slack/Discord/Teams …) – fire-and-forget. */
async function alertWebhook(text: string): Promise<void> {
  const url = process.env.ERROR_WEBHOOK_URL;
  if (!url) return;
  try {
    await fetch(url, {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: JSON.stringify({ text }),
      signal: AbortSignal.timeout(5000),
    });
  } catch {
    // Larmet får aldrig fälla arbetsflödet.
  }
}

// --- Återkommande jobb via BullMQ Job Schedulers (spec §54) ---
const queue = new Queue(QUEUE_NAME, { connection });
async function registerRepeatableJobs() {
  await queue.upsertJobScheduler(
    "scheduler-outbox",
    { every: 30_000 },
    { name: "PUBLISH_OUTBOX", data: { jobType: "PUBLISH_OUTBOX" } },
  );
  await queue.upsertJobScheduler(
    "scheduler-expiry",
    { pattern: "0 7 * * *", tz: "Europe/Stockholm" },
    { name: "SEND_EXPIRY_NOTIFICATION", data: { jobType: "SEND_EXPIRY_NOTIFICATION" } },
  );
  await queue.upsertJobScheduler(
    "scheduler-memory",
    { pattern: "30 3 * * *", tz: "Europe/Stockholm" },
    { name: "UPDATE_USER_MEMORY", data: { jobType: "UPDATE_USER_MEMORY" } },
  );
  await queue.upsertJobScheduler(
    "scheduler-subs",
    { pattern: "15 4 * * *", tz: "Europe/Stockholm" },
    { name: "VERIFY_SUBSCRIPTION", data: { jobType: "VERIFY_SUBSCRIPTION" } },
  );
  await queue.upsertJobScheduler(
    "scheduler-retention",
    { pattern: "45 4 * * *", tz: "Europe/Stockholm" },
    { name: "RUN_RETENTION", data: { jobType: "RUN_RETENTION" } },
  );
  await queue.upsertJobScheduler(
    "scheduler-training",
    { pattern: "45 2 * * 0", tz: "Europe/Stockholm" },
    { name: "BUILD_TRAINING_SAMPLE", data: { jobType: "BUILD_TRAINING_SAMPLE" } },
  );
}

registerRepeatableJobs()
  .then(() => log("Worker igång. Väntar på jobb …"))
  .catch((err) => {
    console.error("Kunde inte registrera återkommande jobb:", err);
  });

const shutdown = async () => {
  log("Stänger ner …");
  await worker.close();
  await queue.close();
  connection.disconnect();
  await ctx.close();
  process.exit(0);
};
process.on("SIGTERM", () => void shutdown());
process.on("SIGINT", () => void shutdown());

function log(msg: string) {
  console.log(`[worker ${new Date().toISOString()}] ${msg}`);
}