import { Router } from "express";
import multer from "multer";
import { checkClarizenAuth, createClarizenClient, getApiKey } from "../clarizen/client.js";
import { ExcelParseError, parseExcelBuffer } from "../excel/parse.js";
import { buildWorkItemHeaderResolver } from "../import/field-headers.js";
import { processImport } from "../import/processor.js";
import { ClarizenApiError } from "@arco/clarizen-lib";

const upload = multer({
  storage: multer.memoryStorage(),
  limits: { fileSize: 10 * 1024 * 1024 },
  fileFilter: (_req, file, cb) => {
    const name = file.originalname.toLowerCase();
    if (name.endsWith(".xlsx") || name.endsWith(".xls")) {
      cb(null, true);
    } else {
      cb(new Error("Envie um arquivo .xlsx ou .xls"));
    }
  },
});

export const importRouter = Router();

importRouter.post(
  "/import",
  upload.single("file"),
  async (req, res) => {
    try {
      if (!getApiKey()) {
        res.status(500).json({
          error: "Defina CLARIZEN_API_KEY ou API_KEY_AW no arquivo .env",
        });
        return;
      }

      if (!req.file) {
        res.status(400).json({ error: "Nenhum arquivo enviado. Use o campo 'file'." });
        return;
      }

      const clarizen = createClarizenClient();
      const auth = await checkClarizenAuth(clarizen);
      if (!auth.ok) {
        res.status(auth.status ?? 502).json({
          error: `Falha de autenticação no Clarizen: ${auth.message}`,
        });
        return;
      }

      const resolver = await buildWorkItemHeaderResolver(clarizen);
      const parsed = parseExcelBuffer(req.file.buffer, resolver);
      const result = await processImport(clarizen, parsed);
      res.json({ ...result, headerMapping: resolver.mapping });
    } catch (err) {
      if (err instanceof ExcelParseError) {
        res.status(400).json({ error: err.message });
        return;
      }
      if (err instanceof multer.MulterError) {
        res.status(400).json({ error: err.message });
        return;
      }
      if (err instanceof Error && err.message.includes(".xlsx")) {
        res.status(400).json({ error: err.message });
        return;
      }
      if (err instanceof ClarizenApiError) {
        res.status(err.status >= 400 && err.status < 600 ? err.status : 502).json({
          error: err.message,
          errorCode: err.errorCode,
        });
        return;
      }
      console.error("[import]", err);
      res.status(500).json({
        error: err instanceof Error ? err.message : "Erro interno ao importar",
      });
    }
  },
);