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

function createIssuesStore() {
  const { subscribe, set, update } = writable({issues: [], issues_idx: {}, issues_nb_responses: 0, issues_need_info: 0});

  return {
    subscribe,
    update: (res_issues, cb=null) => {
      if (res_issues.status === 200) {
        res_issues.json().then((issues) => {
	  const issues_idx = {};
	  let issues_nb_responses = 0;
	  let issues_need_info = 0;
	  issues.forEach(function(issue, k) {
	    issues_idx[issue.id] = issue;
	    issues_nb_responses += issue.texts.length;
	    if (issue.state == 'need-info') issues_need_info++;
            issues[k].texts.reverse();
	  })
          update((i) => (Object.assign(i, {issues, issues_idx, issues_nb_responses, issues_need_info})));

          if (cb) {
            cb(issues, issues_idx, issues_nb_responses, issues_need_info);
          }
        });
      } else if (res_issues.status === 404) {
        update((i) => ({issues: [], issues_idx: {}, issues_nb_responses: 0, issues_need_info: 0}));
      }
    },
  };
}

export const issuesStore = createIssuesStore();

export const issues = derived(
  issuesStore,
  ($issuesStore) => ($issuesStore.issues),
);

export const issues_idx = derived(
  issuesStore,
  ($issuesStore) => ($issuesStore.issues_idx),
);

export const issues_nb_responses = derived(
  issuesStore,
  ($issuesStore) => ($issuesStore.issues_nb_responses),
);

export const issues_need_info = derived(
  issuesStore,
  ($issuesStore) => ($issuesStore.issues_need_info),
);

export const issues_known_responses = writable(0);