git ssb

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var Sustained = require('./sustained')
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var Value = require('mutant/value')
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module.exports = function (root, delay) {
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  var target = Value()
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  root.addEventListener('mouseover', (ev) => {
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    var anchor = null
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    for (var n = ev.target; n.parentNode; n = n.parentNode) {
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      if (n.nodeName === 'A') {
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        anchor = n
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        break
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      }
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    }
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    target.set(anchor)
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  })
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  root.addEventListener('mouseleave', (ev) => {
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    target.set(false)
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  })
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  var active = Value(false)
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  var result = Sustained(Sustained(target, 50), delay || 500, (v) => {
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    // immediately switch to new hover (with 50 ms delay) if there is a current hover in place
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    return v === undefined || (active() && v && v !== result())
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  })
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  result.cancel = () => target.set(undefined)
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  result.active = active
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  return result
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}
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