import { ItemType, Store, StoreEntry } from "./types"


const defaultEndpoint = "http://slateport:4444"

export type APIEndPoint = {
  write: (json: string) => Promise<void>,
  read: () => Promise<Store>,
};

  const makeEndpoint = (key: string, method: string, endPointOverride?: string): string => {
    return `${endPointOverride ?? defaultEndpoint}\/${method}\/${key}\/`;
  }


  export const getAPI = (key: string, endPointOverride?: string): APIEndPoint => ({
    write: async (json: string) => {
      const rawResponse = await fetch(makeEndpoint(key, "write", endPointOverride), {
        method: 'POST',
        headers: {
        },
        body: json,
      });
      const resp = await rawResponse.text();
      return;
    },
    read: async () => {
      const rawResponse = await fetch(makeEndpoint(key, "read", endPointOverride), {
        method: 'POST'
      });
      const respText = await rawResponse.text();
      return JSON.parse(respText, ) as Store;
    }
  });

  export const ensureToday = (store: Store): Store => {
    const today : Date = new Date();
    const storeEntry = store.index.find(([key, dateString]) => {
      const date = new Date(dateString);
      const [y, m, d] = [today.getFullYear(), today.getMonth(), today.getDay()];
      return (date.getFullYear() === y && date.getMonth() === m && date.getDay() == d);
    });

    if (storeEntry !== undefined) return store;

    const indexKey = today.getDay() + today.getMonth() * 100 + today.getFullYear() * 10000;
    const entries = store.entries;
    const newEntry : StoreEntry = {
      items: [],
    }
    entries[indexKey] = newEntry;

    return {
      entries: entries,
      index: [[indexKey, today.toString()], ...store.index ],
      version: store.version,
    };
  }

  export const addEntry = (store: Store, entry: ItemType): Store => {
    const [storeIndex, dateString] = getToday(ensureToday(store))!;
    const today = store.entries[storeIndex];
    today.items = [...today.items, entry];
    store.entries[storeIndex] = today;
    return store;
  }

  export const removeEntry = (store: Store, entry: ItemType): Store => {
    const [storeIndex, dateString] = getToday(ensureToday(store))!;
    const today = store.entries[storeIndex];
    today.items = today.items.filter((item) => JSON.stringify(item) !== JSON.stringify(entry));
    store.entries[storeIndex] = today;
    return store;
  }

  export const getToday = (store: Store) => {
    if (!store) return;
    const today : Date = new Date();
    const storeEntry = store.index.find(([key, dateString]) => {
      const date = new Date(dateString);
      const [y, m, d] = [today.getFullYear(), today.getMonth(), today.getDay()];
      return (date.getFullYear() === y && date.getMonth() === m && date.getDay() == d);
    });
    return storeEntry;
  };