import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { getDbPool } from '../../server/src/db/pool.js';
import { createScriptLogger } from './postal-logging.js';
import { assertGeometryIsWgs84, getFeatureGeometry, getStringProperty, normalizePostalCode, streamFeatureCollection, type PostalDatasetConfig } from './postal-import-utils.js';

const currentDir = path.dirname(fileURLToPath(import.meta.url));
const datasetsRoot = path.resolve(currentDir, '../datasets/postal');

const datasetConfigs: PostalDatasetConfig[] = [
  {
    countryCode: 'US',
    label: 'US ZIP/ZCTA',
    filePath: process.env.POSTAL_US_DATASET_PATH || path.join(datasetsRoot, 'us_zcta.geojson'),
    postalCodeKeys: ['postal_code', 'zip', 'zcta', 'GEOID20', 'ZCTA5CE20', 'ZCTA5CE10'],
    displayNameKeys: ['display_name', 'name', 'NAMELSAD20', 'GEOID20', 'postal_code'],
  },
  {
    countryCode: 'CA',
    label: 'Canada FSA',
    filePath: process.env.POSTAL_CA_DATASET_PATH || path.join(datasetsRoot, 'ca_fsa.geojson'),
    postalCodeKeys: ['postal_code', 'fsa', 'CFSAUID', 'CFSAUID24'],
    displayNameKeys: ['display_name', 'name', 'CFSAUID', 'postal_code'],
  },
];

const logEvery = Math.max(1, Number.parseInt(process.env.POSTAL_IMPORT_LOG_EVERY ?? '500', 10) || 500);

async function importDataset(config: PostalDatasetConfig) {
  const pool = getDbPool();
  const client = await pool.connect();
  const logger = createScriptLogger(`postal-import:${config.countryCode.toLowerCase()}`);
  let index = 0;

  try {
    let insertedCount = 0;
    let skippedCount = 0;

    logger.info(`Starting ${config.label} import from ${config.filePath}`);

    await client.query('begin');

    for await (const feature of streamFeatureCollection(config.filePath)) {
      index += 1;
      const rawPostalCode = getStringProperty(feature.properties, config.postalCodeKeys);

      if (!rawPostalCode) {
        skippedCount += 1;
        if (index % logEvery === 0) {
          logger.info(`Processed ${index} features, inserted ${insertedCount}, skipped ${skippedCount}`);
        }
        continue;
      }

      const normalizedPostalCode = normalizePostalCode(config.countryCode, rawPostalCode);
      if (!normalizedPostalCode) {
        skippedCount += 1;
        if (index % logEvery === 0) {
          logger.info(`Processed ${index} features, inserted ${insertedCount}, skipped ${skippedCount}`);
        }
        continue;
      }

      const displayName = getStringProperty(feature.properties, config.displayNameKeys) || normalizedPostalCode;
      const geometry = getFeatureGeometry(feature, config.filePath, index);
      assertGeometryIsWgs84(geometry, config.filePath, index);

      await client.query(
        `
          insert into public.postal_areas (
            country_code,
            postal_code,
            display_name,
            normalized_postal_code,
            geom,
            centroid,
            search_radius_m,
            metadata_json,
            created_at,
            updated_at
          )
          values (
            $1,
            $2,
            $3,
            $4,
            ST_Multi(ST_SetSRID(ST_GeomFromGeoJSON($5), 4326)),
            ST_Centroid(ST_SetSRID(ST_GeomFromGeoJSON($5), 4326))::geography,
            greatest(1000, round(sqrt(ST_Area(ST_Transform(ST_SetSRID(ST_GeomFromGeoJSON($5), 4326), 3857)) / pi()))::integer),
            $6::jsonb,
            now(),
            now()
          )
          on conflict (country_code, normalized_postal_code)
          do update set
            postal_code = excluded.postal_code,
            display_name = excluded.display_name,
            geom = excluded.geom,
            centroid = excluded.centroid,
            search_radius_m = excluded.search_radius_m,
            metadata_json = excluded.metadata_json,
            updated_at = now()
        `,
        [
          config.countryCode,
          rawPostalCode.trim(),
          displayName,
          normalizedPostalCode,
          JSON.stringify(geometry),
          JSON.stringify(feature.properties ?? {}),
        ],
      );

      insertedCount += 1;

      if (index % logEvery === 0) {
        logger.info(`Processed ${index} features, inserted ${insertedCount}, skipped ${skippedCount}`);
      }
    }

    await client.query('commit');
    logger.info(`Completed ${config.label} import. Inserted ${insertedCount} areas, skipped ${skippedCount}.`);
  } catch (error) {
    await client.query('rollback');
    logger.error(`Import failed after processing ${index} features.`);
    throw error;
  } finally {
    client.release();
  }
}

async function run() {
  const logger = createScriptLogger('postal-import');

  for (const config of datasetConfigs) {
    await importDataset(config);
  }

  logger.info('All postal datasets imported successfully.');
  await getDbPool().end();
}

await run();