import { derived, writable } from 'svelte/store';

function createTeamsStore() {
  const { subscribe, set, update } = writable({teams:{}, teams_count: 0, rank: []});

  return {
    subscribe,
    update: (res_teams, cb=null) => {
      if (res_teams.status === 200) {
        res_teams.json().then((teams) => {
	  const teams_count = Object.keys(teams).length

	  const rank = [];
          for (const tid in teams) {
	    teams[tid].id = Number(tid);
	    rank.push(teams[tid]);
	  }
          rank.sort((a, b) => (a.rank > b.rank ? 1 : (a.rank == b.rank ? 0 : -1)));

          update((t) => (Object.assign(t, {teams, teams_count, rank})));

          if (cb) {
            cb(teams, teams_count, rank);
          }
        });
      }
    },
  };
}

export const teamsStore = createTeamsStore();

export const teams = derived(
  teamsStore,
  ($teamsStore) => ($teamsStore.teams)
);

export const teams_count = derived(
  teamsStore,
  ($teamsStore) => ($teamsStore.teams_count)
);

export const rank = derived(
  teamsStore,
  ($teamsStore) => ($teamsStore.rank)
);