git ssb

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var MutantMap = require('./map')
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var MutantArray = require('./array')
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module.exports = MutantMappedArray
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function MutantMappedArray (defaultItems, lambda, opts) {
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  opts = opts || {}
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  var list = MutantArray(defaultItems, {
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    comparer: opts.comparer,
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    fixedIndexing: true
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  })
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  var obs = MutantMap(list, lambda, opts)
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  obs.set = list.set
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  obs.push = function (item) {
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    list.push(item)
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    return obs.get(obs.getLength() - 1)
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  }
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  obs.insert = function (item, at) {
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    list.insert(item, at)
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    return obs.get(at)
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  }
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  obs.remove = function (mappedItem) {
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    var index = obs.indexOf(mappedItem)
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    if (~index) {
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      list.deleteAt(index)
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      return true
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    }
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  }
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  obs.move = function (mappedItem, targetIndex) {
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    var currentIndex = obs.indexOf(mappedItem)
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    if (~currentIndex && currentIndex !== targetIndex) {
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      var item = list.get(currentIndex)
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      if (currentIndex < targetIndex) {
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        list.transaction(function () {
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          list.insert(item, targetIndex + 1)
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          list.deleteAt(currentIndex)
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        })
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      } else if (currentIndex > targetIndex) {
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        list.transaction(function () {
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          list.insert(item, targetIndex)
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          list.deleteAt(currentIndex + 1)
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        })
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      }
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      if (typeof opts.onMove === 'function') {
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        opts.onMove(mappedItem, currentIndex, targetIndex)
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      }
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    }
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  }
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  return obs
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}
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