/**
 * Роуты для управления конфигурациями серверов
 */

const { s3, BUCKET_NAME, writeS3TextObject, deleteS3Object, headMeta } = require('../services/s3Service');
const { sendError, sendOk } = require('../middleware/errorHandler');
const { GetObjectCommand, DeleteObjectCommand } = require('@aws-sdk/client-s3');
const { streamToString } = require('../services/s3Service');
const { createJsonDataRoutes } = require('./jsonDataRoutes');
const { getS3TextWithHeaders, getS3JsonWithHeaders } = require('../utils/s3Helpers');

// GET /api/server-configs (список серверов)
const serverConfigsListRoutes = createJsonDataRoutes('server-configs.json', (server, i) => {
  if (!server.id || !server.name) {
    return `Server at index ${i} is missing required fields`;
  }
  return null;
});

// GET /api/server-configs/:serverId (конкретная конфигурация)
async function getServerConfig(req, res) {
  const { serverId } = req.params;
  await getS3TextWithHeaders(
    `filter-manager/config-${serverId}.txt`,
    req,
    res,
    {
      transform: (text) => ({ config: text }),
      defaultValue: '// Конфигурация не найдена'
    }
  );
}

// POST /api/server-configs/:serverId (сохранить конфигурацию)
async function postServerConfig(req, res) {
  const { serverId } = req.params;
  const { config } = req.body;
  
  if (!config) {
    return sendError(res, 400, 'Config is required', 'E_BAD_REQUEST');
  }

  try {
    const meta = await writeS3TextObject(`filter-manager/config-${serverId}.txt`, config);
    return sendOk(res, meta);
  } catch (error) {
    console.error(error);
    return sendError(res, 500, 'Error writing server config to S3', 'E_S3');
  }
}

// DELETE /api/server-configs/:serverId (удалить только конфигурацию)
async function deleteServerConfig(req, res) {
  const { serverId } = req.params;
  
  try {
    await deleteS3Object(`filter-manager/config-${serverId}.txt`);
    const meta = await headMeta(`filter-manager/config-${serverId}.txt`);
    return sendOk(res, meta);
  } catch (error) {
    console.error(error);
    return sendError(res, 500, 'Error deleting server config from S3', 'E_S3');
  }
}

// DELETE /api/server-configs/:serverId/complete (удалить конфигурацию и фильтры)
async function deleteServerComplete(req, res) {
  const { serverId } = req.params;
  
  try {
    await Promise.allSettled([
      deleteS3Object(`filter-manager/config-${serverId}.txt`),
      deleteS3Object(`filter-manager/server-filters-${serverId}.json`)
    ]);
    
    return res.json({ ok: true, etag: null, lastModified: null, contentLength: null });
  } catch (error) {
    console.error(error);
    return sendError(res, 500, 'Error deleting server files from S3', 'E_S3');
  }
}

// GET /api/server-filters/:serverId
async function getServerFilters(req, res) {
  const { serverId } = req.params;
  await getS3JsonWithHeaders(
    `filter-manager/server-filters-${serverId}.json`,
    req,
    res,
    { defaultValue: [] }
  );
}

// POST /api/server-filters/:serverId
async function postServerFilters(req, res) {
  const { serverId } = req.params;
  const { filters } = req.body;
  
  if (!Array.isArray(filters)) {
    return sendError(res, 400, 'Filters must be an array', 'E_BAD_REQUEST');
  }
  
  for (let i = 0; i < filters.length; i++) {
    const filter = filters[i];
    if (!filter.community || !filter.gateway) {
      return sendError(res, 400, `Filter at index ${i} is missing required fields`, 'E_SCHEMA');
    }
  }

  try {
    const { writeS3JsonObject } = require('../services/s3Service');
    const meta = await writeS3JsonObject(`filter-manager/server-filters-${serverId}.json`, filters);
    return sendOk(res, meta);
  } catch (error) {
    console.error(error);
    return sendError(res, 500, 'Error writing server filters to S3', 'E_S3');
  }
}

module.exports = {
  serverConfigsListRoutes,
  getServerConfig,
  postServerConfig,
  deleteServerConfig,
  deleteServerComplete,
  getServerFilters,
  postServerFilters,
};