git ssb

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const isArray = require('isarray')
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const positionChoiceError = require('../../errors/sync/positionChoiceError')
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const positionLateError = require('../../errors/sync/positionLateError')
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// Expects `poll` and `position` objects passed in to be of shape:
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// {
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//   key,
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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 chooseOneResults ({positions, poll}) {
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  return positions.reduce(function (results, position) {
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    const { author, content } = position.value
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    const { choice } = content.positionDetails
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    if (isInvalidChoice({position, poll})) {
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      results.errors.push(positionChoiceError({position}))
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      return results
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    }
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    if (isPositionLate({position, poll})) {
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      results.errors.push(positionLateError({position}))
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      return results
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    }
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    // TODO convert from Array to Object
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    // {
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    //   'kea': {
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    //     @piet: 'because things'
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    //   },
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    //   'hermit crab': {
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    //     @katie: 'scuttz..',
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    //     @mix: 'what she said'
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    //   } ]
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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: []})
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}
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function isInvalidChoice ({position, poll}) {
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  const { choice } = position.value.content.positionDetails
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  return choice >= poll.value.content.pollDetails.choices.length
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}
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function isPositionLate ({position, poll}) {
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  return position.value.timestamp > poll.value.content.closesAt
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}
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