import { fetchList, fetchStatistic } from '@api/statistics';
import { StoreType, storage } from 'src/storage';

const NAMESPACE = 'statistics';

function saveData<T>(key: string, data: T) {
  const namespacedKey = `${NAMESPACE}:${key}`;
  const jsonData = JSON.stringify(data);
  storage.set(namespacedKey, jsonData);
}

function loadData<T>(key: string): T | null {
  const namespacedKey = `${NAMESPACE}:${key}`;
  const jsonData = storage.get(namespacedKey, StoreType.STRING) as string;

  return jsonData ? JSON.parse(jsonData) : null;
}

function structureList(listData: Sublist[]) {
  const structuredData: StructuredData = {};
  const baseCategoryName = 'NOMADS STATISTICS';
  const list = [];

  listData.forEach((category) => {
    const categoryName = category.name.split('<br/>')[0];

    if (categoryName === baseCategoryName) {
      if (!structuredData[baseCategoryName]) {
        structuredData[baseCategoryName] = {
          name: baseCategoryName,
          sublists: []
        };
      }

      const descriptor = category.name.split('<br/>')[1].replace(/<[^>]*>?/gm, '');

      const sublist: Sublist | null =
        structuredData[baseCategoryName].sublists?.find((el) => el.name === descriptor) || null;

      if (!sublist) {
        structuredData[baseCategoryName].sublists?.push({
          name: descriptor,
          list: category.list.map((item) => ({
            name: item.name,
            url1: item.url1,
            url2: item.url2 || null
          }))
        });
      }
    } else {
      list.push(category);
    }
  });

  structuredData[baseCategoryName] && list.push(structuredData[baseCategoryName]);
  saveData('list', list);
}

export async function fetchAndSaveStatistics(token: string) {
  const list = await fetchList(token);

  if (list && list.result === 'OK') {
    structureList(list.data);

    for (const category of list.data) {
      for (const item of category.list) {
        const statsData = await fetchStatistic(token, item.url1, item.url2 ?? 'null');

        if (statsData && statsData.result === 'OK') {
          const statsKey = item.url2 ? `stats_${item.url1}_${item.url2}` : `stats_${item.url1}`;

          saveData(statsKey, JSON.stringify(statsData.data));
        }
      }
    }
  }
}

export function getStatistic(url1: string, url2?: string | null): Statistic | null {
  const statsKey = `stats_${url1}${url2 ? `_${url2}` : ''}`;
  return loadData<Statistic>(statsKey);
}

export function getList(): List[] | null {
  return loadData<List[]>('list');
}

interface ListData {
  name: string;
  url1: string;
  url2?: string | null;
}

interface List {
  name: string;
  list?: ListData[];
  sublists?: Sublist[];
}

interface Sublist {
  name: string;
  list: ListData[];
}

interface StructuredData {
  [key: string]: List;
}

interface Statistic {
  data: {
    url1: string;
    url2: string;
    type: number;
    name: string;
    comment: string;
    ranking: Type1[] | Type2[] | Type3[];
  }[];
}

interface Type1 {
  region_id: number;
  cnt: number;
  region_name: string;
  country: string;
  flag: string;
}

interface Type2 {
  cnt: number;
  mega_id: number;
  mega_name: string;
  dare_name: string;
  dare_flag: string;
  dare_id: number;
}

interface Type3 {
  year: number;
  user: number;
  cnt: number;
  first_name: string;
  last_name: string;
  flag: string;
}