// deck.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors

import {type Geocoder} from './geocoder';

const CURRENT_LOCATION = 'current';
const LOCAL_STORAGE_KEY = 'deck-geocoder-history';

export type GeocoderHistoryProps = {
  maxEntries?: number;
};

/**
 * An internal, experimental helper class for storing a list of locations in local storage.
 * @todo Remove the UI related state.
 */
export class GeocoderHistory {
  props: Required<GeocoderHistoryProps>;
  addressText = '';
  errorText = '';
  addressHistory: string[] = [];

  constructor(props: GeocoderHistoryProps) {
    this.props = {maxEntries: 5, ...props};
    this.addressHistory = this.loadPreviousAddresses();
  }

  /** PErform geocoding */
  async geocode(geocoder: Geocoder, address: string, apiKey: string) {
    this.errorText = '';
    this.addressText = address;
    try {
      const coordinates = await geocoder.geocode(address, apiKey);
      if (coordinates) {
        this.storeAddress(this.addressText);
        return coordinates;
      }
      this.errorText = 'Invalid address';
    } catch (error) {
      this.errorText = `${(error as Error).message}`;
    }
    return null;
  }

  loadPreviousAddresses(): string[] {
    try {
      const stored = window.localStorage.getItem(LOCAL_STORAGE_KEY);
      const list = stored && JSON.parse(stored);
      const addresses = Array.isArray(list)
        ? list.filter((v): v is string => typeof v === 'string')
        : [];
      return addresses;
    } catch {
      // ignore
    }
    return [];
  }

  storeAddress(address: string) {
    const cleaned = address.trim();
    if (!cleaned || cleaned === CURRENT_LOCATION) {
      return;
    }
    const deduped = [cleaned, ...this.addressHistory.filter(a => a !== cleaned)];
    this.addressHistory = deduped.slice(0, this.props.maxEntries);
    try {
      window.localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(this.addressHistory));
    } catch {
      // ignore
    }
  }
}