import * as XLSX from "xlsx";
import * as crypto from "crypto";
import * as fs from "fs";
import * as path from "path";
import * as ftp from "basic-ftp";
import * as https from "https";
import * as http from "http";
import { getDb } from "./db";
import { veilleItems, aapItems, importLogs, appSettings } from "../drizzle/schema";
import { eq, inArray } from "drizzle-orm";

// ─── Types ───────────────────────────────────────────────────────────────────

export type SourceType = "local" | "onedrive" | "ftp" | "sharepoint";

export interface ImportConfig {
  sourceType: SourceType;
  veilleFilePath?: string;
  aapFilePath?: string;
  ftpHost?: string;
  ftpPort?: number;
  ftpUser?: string;
  ftpPassword?: string;
  ftpSecure?: boolean;
  onedriveToken?: string;
  sharepointSiteUrl?: string;
  sharepointToken?: string;
}

export interface ImportResult {
  fileType: "veille" | "aap";
  totalRows: number;
  newRows: number;
  skippedRows: number;
  errors: string[];
  status: "success" | "partial" | "error";
}

// ─── Utilitaires ─────────────────────────────────────────────────────────────

function makeDedupKey(titre: string, lien?: string | null): string {
  const raw = `${(titre || "").trim().toLowerCase()}|${(lien || "").trim().toLowerCase()}`;
  return crypto.createHash("md5").update(raw).digest("hex");
}

function parseDate(value: unknown): Date | null {
  if (!value) return null;
  if (value instanceof Date) return isNaN(value.getTime()) ? null : value;
  if (typeof value === "string") {
    const cleaned = value.replace("Z", "").trim();
    const d = new Date(cleaned);
    return isNaN(d.getTime()) ? null : d;
  }
  if (typeof value === "number") {
    // Excel serial date
    const d = XLSX.SSF.parse_date_code(value);
    if (d) return new Date(d.y, d.m - 1, d.d);
  }
  return null;
}

function normalizeStr(v: unknown): string | null {
  if (v === null || v === undefined) return null;
  const s = String(v).trim();
  return s === "" || s === "Non renseigné" ? null : s;
}

// ─── Téléchargement des fichiers selon la source ─────────────────────────────

async function downloadFile(
  filePath: string,
  config: ImportConfig
): Promise<Buffer> {
  switch (config.sourceType) {
    case "local": {
      if (!fs.existsSync(filePath)) {
        throw new Error(`Fichier introuvable : ${filePath}`);
      }
      return fs.readFileSync(filePath);
    }

    case "ftp": {
      const client = new ftp.Client();
      client.ftp.verbose = false;
      try {
        await client.access({
          host: config.ftpHost!,
          port: config.ftpPort || 21,
          user: config.ftpUser!,
          password: config.ftpPassword!,
          secure: config.ftpSecure || false,
        });
        const tmpPath = `/tmp/veille_import_${Date.now()}.xlsx`;
        await client.downloadTo(tmpPath, filePath);
        const buf = fs.readFileSync(tmpPath);
        fs.unlinkSync(tmpPath);
        return buf;
      } finally {
        client.close();
      }
    }

    case "onedrive":
    case "sharepoint": {
      const token =
        config.sourceType === "onedrive"
          ? config.onedriveToken
          : config.sharepointToken;
      if (!token) throw new Error("Token d'authentification manquant");

      return new Promise((resolve, reject) => {
        const url = new URL(filePath);
        const options = {
          hostname: url.hostname,
          path: url.pathname + url.search,
          headers: { Authorization: `Bearer ${token}` },
        };
        const protocol = url.protocol === "https:" ? https : http;
        protocol
          .get(options, (res) => {
            const chunks: Buffer[] = [];
            res.on("data", (c) => chunks.push(c));
            res.on("end", () => resolve(Buffer.concat(chunks)));
            res.on("error", reject);
          })
          .on("error", reject);
      });
    }

    default:
      throw new Error(`Source non supportée : ${config.sourceType}`);
  }
}

// ─── Lecture des paramètres depuis la BDD ────────────────────────────────────

export async function getImportConfig(): Promise<ImportConfig> {
  const db = await getDb();
  if (!db) return { sourceType: "local" };

  const rows = await db.select().from(appSettings);
  const map: Record<string, string> = {};
  for (const r of rows) {
    if (r.key && r.value) map[r.key] = r.value;
  }

  return {
    sourceType: (map["source_type"] as SourceType) || "local",
    veilleFilePath: map["veille_file_path"] || "",
    aapFilePath: map["aap_file_path"] || "",
    ftpHost: map["ftp_host"],
    ftpPort: map["ftp_port"] ? parseInt(map["ftp_port"]) : 21,
    ftpUser: map["ftp_user"],
    ftpPassword: map["ftp_password"],
    ftpSecure: map["ftp_secure"] === "true",
    onedriveToken: map["onedrive_token"],
    sharepointSiteUrl: map["sharepoint_site_url"],
    sharepointToken: map["sharepoint_token"],
  };
}

// ─── Import Veille Stratégique ───────────────────────────────────────────────

const VEILLE_SHEETS: Record<string, "reglementaire" | "concurrentielle" | "technologique" | "generale"> = {
  réglementaire: "reglementaire",
  reglementaire: "reglementaire",
  concurrentielle: "concurrentielle",
  technologique: "technologique",
  générale: "generale",
  generale: "generale",
};

export async function importVeille(config: ImportConfig): Promise<ImportResult> {
  const startedAt = new Date();
  const errors: string[] = [];
  let totalRows = 0;
  let newRows = 0;
  let skippedRows = 0;

  const db = await getDb();
  if (!db) throw new Error("Base de données indisponible");

  const filePath = config.veilleFilePath;
  if (!filePath) throw new Error("Chemin du fichier Veille non configuré");

  let buffer: Buffer;
  try {
    buffer = await downloadFile(filePath, config);
  } catch (e: unknown) {
    const msg = e instanceof Error ? e.message : String(e);
    await logImport(db, "veille", filePath, "error", 0, 0, 0, msg, null, startedAt);
    return { fileType: "veille", totalRows: 0, newRows: 0, skippedRows: 0, errors: [msg], status: "error" };
  }

  const workbook = XLSX.read(buffer, { type: "buffer", cellDates: true });

  for (const sheetName of workbook.SheetNames) {
    const normalized = sheetName.toLowerCase().trim();
    if (normalized === "poubelle") continue;
    const typeVeille = VEILLE_SHEETS[normalized];
    if (!typeVeille) continue;

    const sheet = workbook.Sheets[sheetName];
    const rows = XLSX.utils.sheet_to_json<Record<string, unknown>>(sheet, { defval: null });

    for (const row of rows) {
      totalRows++;
      const titre = normalizeStr(row["Titre"]);
      if (!titre) { skippedRows++; continue; }

      const lien = normalizeStr(row["Lien"]);
      const dedupKey = makeDedupKey(titre, lien);

      // Vérifier si déjà présent
      const existing = await db
        .select({ id: veilleItems.id })
        .from(veilleItems)
        .where(eq(veilleItems.dedupKey, dedupKey))
        .limit(1);

      if (existing.length > 0) { skippedRows++; continue; }

      // Extraire la date depuis la colonne Source (qui contient une date ISO)
      const sourceRaw = row["Source"];
      const datePublication = parseDate(sourceRaw);

      // La vraie source (URL) semble être dans Lien pour certaines feuilles
      const sourceStr = normalizeStr(sourceRaw instanceof Date ? null : sourceRaw);

      try {
        await db.insert(veilleItems).values({
          dedupKey,
          titre,
          categorie: normalizeStr(row["Catégorie"]),
          niveau: normalizeStr(row["Niveau"]),
          territoire: normalizeStr(row["Territoire"]),
          resume: normalizeStr(row[" Résumé"] ?? row["Résumé"] ?? row["Resume"]),
          source: sourceStr,
          passage: normalizeStr(row["passage"] ?? row["Passage"]),
          lien,
          typeVeille,
          datePublication,
        });
        newRows++;
      } catch (e: unknown) {
        const msg = e instanceof Error ? e.message : String(e);
        errors.push(`[${sheetName}] ${titre?.substring(0, 50)}: ${msg}`);
        skippedRows++;
      }
    }
  }

  const status = errors.length === 0 ? "success" : newRows > 0 ? "partial" : "error";
  await logImport(db, "veille", filePath, status, totalRows, newRows, skippedRows, errors.join("\n") || null, { errors }, startedAt);

  return { fileType: "veille", totalRows, newRows, skippedRows, errors, status };
}

// ─── Import Appels à Projets ─────────────────────────────────────────────────

const AAP_SHEETS: Record<string, "Handicap" | "PA" | "Enfance" | "Précarité" | "Sanitaire" | "Autre"> = {
  handicap: "Handicap",
  pa: "PA",
  enfance: "Enfance",
  "précarité": "Précarité",
  precarite: "Précarité",
  sanitaire: "Sanitaire",
  autre: "Autre",
};

export async function importAAP(config: ImportConfig): Promise<ImportResult> {
  const startedAt = new Date();
  const errors: string[] = [];
  let totalRows = 0;
  let newRows = 0;
  let skippedRows = 0;

  const db = await getDb();
  if (!db) throw new Error("Base de données indisponible");

  const filePath = config.aapFilePath;
  if (!filePath) throw new Error("Chemin du fichier AAP non configuré");

  let buffer: Buffer;
  try {
    buffer = await downloadFile(filePath, config);
  } catch (e: unknown) {
    const msg = e instanceof Error ? e.message : String(e);
    await logImport(db, "aap", filePath, "error", 0, 0, 0, msg, null, startedAt);
    return { fileType: "aap", totalRows: 0, newRows: 0, skippedRows: 0, errors: [msg], status: "error" };
  }

  const workbook = XLSX.read(buffer, { type: "buffer", cellDates: true });

  for (const sheetName of workbook.SheetNames) {
    const normalized = sheetName.toLowerCase().trim().replace(/é/g, "e").replace(/è/g, "e");
    const categorie = AAP_SHEETS[sheetName.toLowerCase().trim()] || AAP_SHEETS[normalized];
    if (!categorie) continue;

    const sheet = workbook.Sheets[sheetName];
    const rows = XLSX.utils.sheet_to_json<Record<string, unknown>>(sheet, { defval: null });

    for (const row of rows) {
      totalRows++;
      const titre = normalizeStr(row["Titre"]);
      if (!titre) { skippedRows++; continue; }

      const lien = normalizeStr(row["Lien"]);
      const dedupKey = makeDedupKey(titre, lien);

      const existing = await db
        .select({ id: aapItems.id })
        .from(aapItems)
        .where(eq(aapItems.dedupKey, dedupKey))
        .limit(1);

      if (existing.length > 0) { skippedRows++; continue; }

      const datePublication = parseDate(row["Date publication"]);
      const dateCloture = parseDate(row["Date clôture"]);

      try {
        await db.insert(aapItems).values({
          dedupKey,
          titre,
          categorie,
          region: normalizeStr(row["Région"]),
          departement: normalizeStr(row["Département"]),
          dateCloture,
          datePublication,
          lien,
        });
        newRows++;
      } catch (e: unknown) {
        const msg = e instanceof Error ? e.message : String(e);
        errors.push(`[${sheetName}] ${titre?.substring(0, 50)}: ${msg}`);
        skippedRows++;
      }
    }
  }

  const status = errors.length === 0 ? "success" : newRows > 0 ? "partial" : "error";
  await logImport(db, "aap", filePath, status, totalRows, newRows, skippedRows, errors.join("\n") || null, { errors }, startedAt);

  return { fileType: "aap", totalRows, newRows, skippedRows, errors, status };
}

// ─── Import complet (veille + AAP) ───────────────────────────────────────────

export async function runFullImport(): Promise<{ veille: ImportResult; aap: ImportResult }> {
  const config = await getImportConfig();
  const [veille, aap] = await Promise.all([
    importVeille(config),
    importAAP(config),
  ]);
  return { veille, aap };
}

// ─── Enregistrement des logs ─────────────────────────────────────────────────

async function logImport(
  db: Awaited<ReturnType<typeof getDb>>,
  fileType: "veille" | "aap",
  source: string,
  status: "success" | "partial" | "error",
  totalRows: number,
  newRows: number,
  skippedRows: number,
  errorMessage: string | null,
  details: unknown,
  startedAt: Date
) {
  if (!db) return;
  try {
    await db.insert(importLogs).values({
      fileType,
      source,
      status,
      totalRows,
      newRows,
      skippedRows,
      errorMessage,
      details: details as Record<string, unknown> | null,
      startedAt,
      completedAt: new Date(),
    });
  } catch (e) {
    console.error("[Import] Erreur lors de l'enregistrement du log:", e);
  }
}