import "dotenv/config";
import express from "express";
import { createServer } from "http";
import net from "net";
import { createExpressMiddleware } from "@trpc/server/adapters/express";
import * as cron from "node-cron";
import { registerOAuthRoutes } from "./oauth";
import { appRouter } from "../routers";
import { createContext } from "./context";
import { serveStatic, setupVite } from "./vite";
import { runFullImport } from "../importer";
import uploadRoutes from "../uploadRoutes";
import scheduledRoutes from "../scheduledRoutes";
import { ensureAdminExists } from "../localAuth";
import { getSetting } from "../db";
import { runRssFetch } from "../rssEngine";

function isPortAvailable(port: number): Promise<boolean> {
  return new Promise(resolve => {
    const server = net.createServer();
    server.listen(port, () => { server.close(() => resolve(true)); });
    server.on("error", () => resolve(false));
  });
}

async function findAvailablePort(startPort: number = 3000): Promise<number> {
  for (let port = startPort; port < startPort + 20; port++) {
    if (await isPortAvailable(port)) return port;
  }
  throw new Error(`No available port found starting from ${startPort}`);
}

// ─── Tâche d'import quotidien + lecture RSS ──────────────────────────────────
let cronJob: ReturnType<typeof cron.schedule> | null = null;

export async function scheduleDailyImport() {
  const importTime = (await getSetting("import_time")) || "06:00";
  const fetchMode = (await getSetting("fetch_mode")) || "daily";
  const fetchIntervalMinutes = parseInt((await getSetting("fetch_interval_minutes")) || "1440", 10);
  const fetchWeekDay = (await getSetting("fetch_week_day")) || "1"; // 0=dim, 1=lun, ..., 6=sam
  const fetchMonthDay = (await getSetting("fetch_month_day")) || "1"; // 1-28

  const [hour, minute] = importTime.split(":").map(Number);
  const h = hour ?? 6;
  const m = minute ?? 0;

  let cronExpr: string;
  let cronLabel: string;

  if (fetchMode === "interval") {
    const intervalMin = Math.max(60, fetchIntervalMinutes);
    if (intervalMin % 60 === 0) {
      const hours = intervalMin / 60;
      cronExpr = hours === 24 ? `0 ${m} ${h} * * *` : `0 ${m} */${hours} * * *`;
    } else {
      cronExpr = `0 */${intervalMin} * * * *`;
    }
    const hours = intervalMin / 60;
    cronLabel = `Mode intervalle — toutes les ${hours >= 1 ? hours + "h" : intervalMin + "min"} (${cronExpr})`;
  } else if (fetchMode === "weekly") {
    // hebdomadaire : le jour choisi à l'heure choisie
    cronExpr = `0 ${m} ${h} * * ${fetchWeekDay}`;
    const jours = ["dimanche", "lundi", "mardi", "mercredi", "jeudi", "vendredi", "samedi"];
    cronLabel = `Mode hebdomadaire — chaque ${jours[parseInt(fetchWeekDay)] ?? "lundi"} à ${importTime} (${cronExpr})`;
  } else if (fetchMode === "monthly") {
    // mensuel : le jour du mois choisi à l'heure choisie
    const day = Math.min(28, Math.max(1, parseInt(fetchMonthDay)));
    cronExpr = `0 ${m} ${h} ${day} * *`;
    cronLabel = `Mode mensuel — le ${day} de chaque mois à ${importTime} (${cronExpr})`;
  } else {
    // daily (défaut)
    cronExpr = `0 ${m} ${h} * * *`;
    cronLabel = `Mode quotidien — tous les jours à ${importTime} (${cronExpr})`;
  }

  console.log(`[Cron] ${cronLabel}`);

  if (cronJob) {
    cronJob.stop();
    cronJob = null;
  }
  cronJob = cron.schedule(cronExpr, async () => {
    console.log(`[Cron] Import automatique démarré à ${new Date().toISOString()}`);
    try {
      // 1. Import des fichiers Excel (Veille + AAP)
      const result = await runFullImport();
      console.log(`[Cron] Import Excel terminé — Veille: +${result.veille.newRows} | AAP: +${result.aap.newRows}`);
    } catch (e) {
      console.error("[Cron] Erreur lors de l'import Excel:", e);
    }
    try {
      // 2. Lecture des flux RSS
      const rssSummary = await runRssFetch();
      console.log(
        `[Cron] Lecture RSS terminée — ${rssSummary.totalFeeds} flux, ` +
        `+${rssSummary.totalNewItems} nouveaux articles, ` +
        `${rssSummary.errorFeeds} erreur(s)`
      );
    } catch (e) {
      console.error("[Cron] Erreur lors de la lecture RSS:", e);
    }
  });
}

/**
 * Stub conservé pour compatibilité avec les imports existants dans routers.ts.
 * La lecture RSS est désormais intégrée dans scheduleDailyImport().
 */
export async function scheduleRssFetch() {
  // No-op : la lecture RSS est pilotée par le cron d'import quotidien (import_time)
  console.log("[RSS Cron] Planificateur RSS indépendant désactivé — la lecture est pilotée par le cron d'import quotidien.");
}

async function startServer() {
  const app = express();
  const server = createServer(app);

  app.use(express.json({ limit: "50mb" }));
  app.use(express.urlencoded({ limit: "50mb", extended: true }));

  registerOAuthRoutes(app);
  app.use(uploadRoutes);
  app.use(scheduledRoutes);
  app.use(
    "/api/trpc",
    createExpressMiddleware({ router: appRouter, createContext })
  );

  if (process.env.NODE_ENV === "development") {
    await setupVite(app, server);
  } else {
    serveStatic(app);
  }

  const preferredPort = parseInt(process.env.PORT || "3000");
  const port = await findAvailablePort(preferredPort);
  if (port !== preferredPort) {
    console.log(`Port ${preferredPort} is busy, using port ${port} instead`);
  }

  server.listen(port, async () => {
    console.log(`Server running on http://localhost:${port}/`);
    // Initialisation post-démarrage
    try {
      await ensureAdminExists();
      await scheduleDailyImport();
    } catch (e) {
      console.error("[Init] Erreur d'initialisation:", e);
    }
  });
}

startServer().catch(console.error);