import { computed, Ref } from 'vue';
import { useI18n } from 'vue-i18n';

import { useDate } from '~/compositions/useDate';
import { useElapsedTime } from '~/compositions/useElapsedTime';
import { Pipeline } from '~/lib/api/types';
import { convertEmojis } from '~/utils/emoji';

const { toLocaleString, timeAgo, prettyDuration } = useDate();

export default (pipeline: Ref<Pipeline | undefined>) => {
  const sinceRaw = computed(() => {
    if (!pipeline.value) {
      return undefined;
    }

    const start = pipeline.value.created_at || 0;

    return start * 1000;
  });

  const sinceUnderOneHour = computed(
    () => sinceRaw.value !== undefined && sinceRaw.value > 0 && sinceRaw.value <= 1000 * 60 * 60,
  );
  const { time: sinceElapsed } = useElapsedTime(sinceUnderOneHour, sinceRaw);

  const i18n = useI18n();
  const since = computed(() => {
    if (sinceRaw.value === 0) {
      return i18n.t('time.not_started');
    }

    if (sinceElapsed.value === undefined) {
      return null;
    }

    // TODO check whether elapsed works
    return timeAgo(sinceElapsed.value);
  });

  const durationRaw = computed(() => {
    if (!pipeline.value) {
      return undefined;
    }

    const start = pipeline.value.started_at || 0;
    const end = pipeline.value.finished_at || pipeline.value.updated_at || 0;

    if (start === 0 || end === 0) {
      return 0;
    }

    // only calculate time based no now() for running pipelines
    if (pipeline.value.status === 'running') {
      return Date.now() - start * 1000;
    }

    return (end - start) * 1000;
  });

  const running = computed(() => pipeline.value !== undefined && pipeline.value.status === 'running');
  const { time: durationElapsed } = useElapsedTime(running, durationRaw);

  const duration = computed(() => {
    if (durationElapsed.value === undefined) {
      return null;
    }

    if (durationRaw.value === 0) {
      return i18n.t('time.not_started');
    }

    return prettyDuration(durationElapsed.value);
  });

  const message = computed(() => {
    if (!pipeline.value) {
      return '';
    }

    return convertEmojis(pipeline.value.message);
  });

  const title = computed(() => message.value.split('\n')[0]);

  const prettyRef = computed(() => {
    if (pipeline.value?.event === 'push' || pipeline.value?.event === 'deployment') {
      return pipeline.value.branch;
    }

    if (pipeline.value?.event === 'cron') {
      return pipeline.value.ref.replaceAll('refs/heads/', '');
    }

    if (pipeline.value?.event === 'tag') {
      return pipeline.value.ref.replaceAll('refs/tags/', '');
    }

    if (pipeline.value?.event === 'pull_request' || pipeline.value?.event === 'pull_request_closed') {
      return `#${pipeline.value.ref
        .replaceAll('refs/pull/', '')
        .replaceAll('refs/merge-requests/', '')
        .replaceAll('/merge', '')
        .replaceAll('/head', '')}`;
    }

    return pipeline.value?.ref;
  });

  const created = computed(() => {
    if (!pipeline.value) {
      return undefined;
    }

    const start = pipeline.value.created_at || 0;

    return toLocaleString(new Date(start * 1000));
  });

  return { since, duration, message, title, prettyRef, created };
};