import { FeatureCollection, Feature, Point } from "geojson";
import * as fs from 'fs';
import * as path from 'path';
import csvParser from 'csv-parser';


let counter = 0;
let counter_features = 0;
let counter_missing_lat = 0;
let counter_missing_lon = 0;


function csvToGeoJSON(options: Options): FeatureCollection<Point> {
  const { dir, file, latColumn, lonColumn, hasHeaders } = options;

  console.log(`options latColumn:  ${latColumn}`);
  console.log(`options lonColumn:  ${lonColumn}`);

  const filePath = path.join(dir, file);
  const features: Feature<Point>[] = [];
  let geoJSON: FeatureCollection<Point> = {
    type: 'FeatureCollection',
    features,
  };


  let headers: string[] = [];
  let headersFound = false;
  let limitOffset = 100000000;

  fs.createReadStream(filePath)
    .pipe(csvParser({ headers: hasHeaders }))
    .on('data', (row) => {
      counter += 1;
      if (!headersFound && hasHeaders) {
        let keys = Object.keys(row);
        keys.forEach((key) => {
          headers.push(row[key]);
        });
        headersFound = true;
        console.log(`headers:  ${headers}`);
      }
      if (counter > limitOffset) {
        return;
      }
      if (headers.indexOf(latColumn) && headers.indexOf(lonColumn)) {
        const lat = parseFloat(row['_' + headers.indexOf(latColumn)]);
        const lon = parseFloat(row['_' + headers.indexOf(lonColumn)]);

        // Si pas d'entêtes, utiliser des noms de colonnes génériques
        if (!hasHeaders) {
          const properties: { [key: string]: any } = {};
          Object.keys(row).forEach((key, index) => {
            properties[headers[index]] = row[key];
          });
          row = properties;
        } else {
          let keys = Object.keys(row);
          // Utiliser les entêtes comme noms de propriétés
          const properties: { [key: string]: any } = {};
          headers.forEach((header, index) => {

            properties[header] = row['_' + index];
          });
          row = properties;
        }

        // filtrer la ligne du header si présente
        if (lon && lat) {
          if (hasHeaders && counter > 1 || !hasHeaders || counter > limitOffset) {
            features.push({
              type: 'Feature',
              geometry: {
                type: 'Point',
                coordinates: [lon, lat],
              },
              properties: row,
            });
            counter_features += 1;
          }
        }
        if (headers.indexOf(latColumn) === -1) {
          console.log('!!! no latColumn', row);
          counter_missing_lat += 1;
        }
        if (headers.indexOf(lonColumn) === -1) {
          console.log('!!! no lonColumn', row);
          counter_missing_lon += 1;
        }
      }
    })
    .on('end', () => {
      geoJSON = {
        type: 'FeatureCollection',
        features,
      };
      fs.writeFileSync(`${dir}/${file}.geojson`, JSON.stringify(geoJSON, null, 2));
      console.log(`GeoJSON créé avec succès : ${file}.geojson`);
      console.log(`geoJSON lines:  ${counter}`);
      console.log(`geoJSON lines missing lat:  ${counter_missing_lat}`);
      console.log(`geoJSON lines missing lon:  ${counter_missing_lon}`);
      console.log(`geoJSON lines features:  ${counter_features}`);
    });

  return geoJSON;
}

function checkFile(args: Options) {
  let filePath = path.join(args.dir, args.file);
  let lineCount = 0;

  // Vérifier si le fichier existe
  if (!fs.existsSync(filePath)) {
    throw new Error(`Le fichier CSV ${filePath} n'existe pas`);
  } else {
    console.log(`Le fichier CSV ${filePath} existe`);
  }

  fs.createReadStream(filePath)
    .on('data', () => {
      lineCount++;
    })
    .on('end', () => {
      console.log(`Nombre de lignes dans le fichier CSV : ${Math.floor(lineCount)}`);
    });


}
function countGeoJSONFeatures(args: Options) {
  const filePath = path.join(args.dir, `${args.file}.geojson`);

  // Vérifier si le fichier GeoJSON existe
  if (!fs.existsSync(filePath)) {
    console.log(`Le fichier GeoJSON ${filePath} n'existe pas`);
    return;
  }

  // Lire et parser le fichier GeoJSON
  const geoJSON = JSON.parse(fs.readFileSync(filePath, 'utf8'));

  // Compter le nombre de features
  const featureCount = geoJSON.features?.length || 0;

  console.log(`Nombre de features dans le GeoJSON : ${featureCount}`);
  return featureCount;
}

export {
  csvToGeoJSON,
  checkFile,
  countGeoJSONFeatures
};