git ssb

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const isArray = require('isarray')
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const Position = require('../../position/sync/position')
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// Expects `poll` and `position` objects passed in to be of shape:
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// {
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//  value: {
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//    content: {...},
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//    timestamp: ...
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//    author: ...
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//  }
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// }
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//
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// postions must be of the correct type ie: type checked by the caller.
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module.exports = function ({positions, poll}) {
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  return positions.reduce(function (results, position) {
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    const { value: {author} } = position
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    const { positionDetails: {choice} } = Position(position)
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    if (isInvalidChoice({position, poll}) || isPositionAfterClose({position, poll})) {
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      results.errors.invalidPositions.push(position)
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      return results
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    }
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    if (!isArray(results[choice])) {
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      results[choice] = []
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    }
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    results[choice].push(author)
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    return results
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  }, {errors: {invalidPositions: []}})
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}
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function isInvalidChoice ({position, poll}) {
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  const { positionDetails: {choice} } = Position(position)
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  return choice >= poll.pollDetails.choices.length
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}
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function isPositionAfterClose ({position, poll}) {
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  return position.value.timestamp > poll.closesAt
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}
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