import type { Request, Response, NextFunction } from 'express';
import * as cfdiService from '../services/cfdi.service.js';
import { AppError } from '../middlewares/error.middleware.js';
import type { CfdiFilters } from '@horux/shared';

export async function getCfdis(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    const filters: CfdiFilters = {
      tipo: req.query.tipo as any,
      estado: req.query.estado as any,
      fechaInicio: req.query.fechaInicio as string,
      fechaFin: req.query.fechaFin as string,
      rfc: req.query.rfc as string,
      emisor: req.query.emisor as string,
      receptor: req.query.receptor as string,
      search: req.query.search as string,
      page: parseInt(req.query.page as string) || 1,
      limit: parseInt(req.query.limit as string) || 20,
    };

    const result = await cfdiService.getCfdis(req.tenantPool, filters);
    res.json(result);
  } catch (error) {
    next(error);
  }
}

export async function getCfdiById(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    const cfdi = await cfdiService.getCfdiById(req.tenantPool, String(req.params.id));

    if (!cfdi) {
      return next(new AppError(404, 'CFDI no encontrado'));
    }

    res.json(cfdi);
  } catch (error) {
    next(error);
  }
}

export async function getXml(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    const xml = await cfdiService.getXmlById(req.tenantPool, String(req.params.id));

    if (!xml) {
      return next(new AppError(404, 'XML no encontrado para este CFDI'));
    }

    res.set('Content-Type', 'application/xml');
    res.set('Content-Disposition', `attachment; filename="cfdi-${req.params.id}.xml"`);
    res.send(xml);
  } catch (error) {
    next(error);
  }
}

export async function getEmisores(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    const search = (req.query.search as string) || '';
    if (search.length < 2) {
      return res.json([]);
    }

    const emisores = await cfdiService.getEmisores(req.tenantPool, search);
    res.json(emisores);
  } catch (error) {
    next(error);
  }
}

export async function getReceptores(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    const search = (req.query.search as string) || '';
    if (search.length < 2) {
      return res.json([]);
    }

    const receptores = await cfdiService.getReceptores(req.tenantPool, search);
    res.json(receptores);
  } catch (error) {
    next(error);
  }
}

export async function getResumen(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    const año = parseInt(req.query.año as string) || new Date().getFullYear();
    const mes = parseInt(req.query.mes as string) || new Date().getMonth() + 1;

    const resumen = await cfdiService.getResumenCfdis(req.tenantPool, año, mes);
    res.json(resumen);
  } catch (error) {
    next(error);
  }
}

export async function createCfdi(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    if (!['admin', 'contador'].includes(req.user!.role)) {
      return next(new AppError(403, 'No tienes permisos para agregar CFDIs'));
    }

    const cfdi = await cfdiService.createCfdi(req.tenantPool, req.body);
    res.status(201).json(cfdi);
  } catch (error: any) {
    if (error.message?.includes('duplicate')) {
      return next(new AppError(409, 'Este CFDI ya existe (UUID duplicado)'));
    }
    next(error);
  }
}

export async function createManyCfdis(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    if (!['admin', 'contador'].includes(req.user!.role)) {
      return next(new AppError(403, 'No tienes permisos para agregar CFDIs'));
    }

    if (!Array.isArray(req.body.cfdis)) {
      return next(new AppError(400, 'Se requiere un array de CFDIs'));
    }

    const batchInfo = {
      batchNumber: req.body.batchNumber || 1,
      totalBatches: req.body.totalBatches || 1,
      totalFiles: req.body.totalFiles || req.body.cfdis.length
    };

    console.log(`[CFDI Bulk] Lote ${batchInfo.batchNumber}/${batchInfo.totalBatches} - ${req.body.cfdis.length} CFDIs`);

    const result = await cfdiService.createManyCfdisBatch(req.tenantPool, req.body.cfdis);

    res.status(201).json({
      message: `Lote ${batchInfo.batchNumber} procesado`,
      batchNumber: batchInfo.batchNumber,
      totalBatches: batchInfo.totalBatches,
      inserted: result.inserted,
      duplicates: result.duplicates,
      errors: result.errors,
      errorMessages: result.errorMessages.slice(0, 5)
    });
  } catch (error: any) {
    console.error('[CFDI Bulk Error]', error.message, error.stack);
    next(new AppError(400, error.message || 'Error al procesar CFDIs'));
  }
}

export async function deleteCfdi(req: Request, res: Response, next: NextFunction) {
  try {
    if (!req.tenantPool) {
      return next(new AppError(400, 'Tenant no configurado'));
    }

    if (!['admin', 'contador'].includes(req.user!.role)) {
      return next(new AppError(403, 'No tienes permisos para eliminar CFDIs'));
    }

    await cfdiService.deleteCfdi(req.tenantPool, String(req.params.id));
    res.status(204).send();
  } catch (error) {
    next(error);
  }
}