8967edee8d
Removing both from courseware and courseHome reducers. This makes it easier for various portions of the app to find out what the current course is without being aware of which page is loaded. In this MFE, we can basically always assume _some_ course is loaded.
25 lines
1.2 KiB
JavaScript
25 lines
1.2 KiB
JavaScript
/* eslint-disable import/prefer-default-export */
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import { useSelector } from 'react-redux';
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import { useModel } from '../../../../generic/model-store';
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import { sequenceIdsSelector } from '../../../data/selectors';
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export function useSequenceNavigationMetadata(currentSequenceId, currentUnitId) {
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const sequenceIds = useSelector(sequenceIdsSelector);
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const sequence = useModel('sequences', currentSequenceId);
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const courseStatus = useSelector(state => state.activeCourse.courseStatus);
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// If we don't know the sequence and unit yet, then assume no.
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if (courseStatus !== 'loaded' || !currentSequenceId || !currentUnitId) {
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return { isFirstUnit: false, isLastUnit: false };
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}
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const isFirstSequence = sequenceIds.indexOf(currentSequenceId) === 0;
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const isFirstUnitInSequence = sequence.unitIds.indexOf(currentUnitId) === 0;
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const isFirstUnit = isFirstSequence && isFirstUnitInSequence;
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const isLastSequence = sequenceIds.indexOf(currentSequenceId) === sequenceIds.length - 1;
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const isLastUnitInSequence = sequence.unitIds.indexOf(currentUnitId) === sequence.unitIds.length - 1;
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const isLastUnit = isLastSequence && isLastUnitInSequence;
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return { isFirstUnit, isLastUnit };
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}
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