git ssb

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const nest = require('depnest')
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const Url = require('url')
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const { isMsg } = require('ssb-ref')
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exports.gives = nest('app.async.catchLinkClick')
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exports.needs = nest({
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  'sbot.async.get': 'first'
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})
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exports.create = function (api) {
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  return nest('app.async.catchLinkClick', catchLinkClick)
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  function catchLinkClick (root, cb) {
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    root.addEventListener('click', (ev) => {
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      if (ev.target.tagName === 'INPUT' && ev.target.type === 'file') return
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      if (ev.defaultPrevented) return // TODO check this is in the right place
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      ev.preventDefault()
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      ev.stopPropagation()
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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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      if (!anchor) return true
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      const href = anchor.getAttribute('href')
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      if (!href) return
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      const url = Url.parse(href)
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      const opts = {
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        isExternal: !!url.host
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      }
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      if (isMsg(href)) {
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        api.sbot.async.get(href, (err, data) => {
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          // NOTE the catchLinkClick cb has signature (link, opts)
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          cb(err || {key: href, value: data}, opts)
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        })
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        return
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      }
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      cb(href, opts)
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    })
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  }
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}
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