module.exports = exports = search

var npm = require('./npm.js')
var columnify = require('columnify')
var updateIndex = require('./cache/update-index.js')

search.usage = 'npm search [--long] [search terms ...]' +
               '\n\naliases: s, se'

search.completion = function (opts, cb) {
  var compl = {}
  var partial = opts.partialWord
  var ipartial = partial.toLowerCase()
  var plen = partial.length

  // get the batch of data that matches so far.
  // this is an example of using npm.commands.search programmatically
  // to fetch data that has been filtered by a set of arguments.
  search(opts.conf.argv.remain.slice(2), true, function (er, data) {
    if (er) return cb(er)
    Object.keys(data).forEach(function (name) {
      data[name].words.split(' ').forEach(function (w) {
        if (w.toLowerCase().indexOf(ipartial) === 0) {
          compl[partial + w.substr(plen)] = true
        }
      })
    })
    cb(null, Object.keys(compl))
  })
}

function search (args, silent, staleness, cb) {
  if (typeof cb !== 'function') {
    cb = staleness
    staleness = 600
  }
  if (typeof cb !== 'function') {
    cb = silent
    silent = false
  }

  var searchopts = npm.config.get('searchopts')
  var searchexclude = npm.config.get('searchexclude')

  if (typeof searchopts !== 'string') searchopts = ''
  searchopts = searchopts.split(/\s+/)
  var opts = searchopts.concat(args).map(function (s) {
    return s.toLowerCase()
  }).filter(function (s) { return s })

  if (typeof searchexclude === 'string') {
    searchexclude = searchexclude.split(/\s+/)
  } else {
    searchexclude = []
  }
  searchexclude = searchexclude.map(function (s) {
    return s.toLowerCase()
  })

  getFilteredData(staleness, opts, searchexclude, function (er, data) {
    // now data is the list of data that we want to show.
    // prettify and print it, and then provide the raw
    // data to the cb.
    if (er || silent) return cb(er, data)
    console.log(prettify(data, args))
    cb(null, data)
  })
}

function getFilteredData (staleness, args, notArgs, cb) {
  updateIndex(staleness, function (er, data) {
    if (er) return cb(er)
    return cb(null, filter(data, args, notArgs))
  })
}

function filter (data, args, notArgs) {
  // data={<name>:{package data}}
  return Object.keys(data).map(function (d) {
    return data[d]
  }).filter(function (d) {
    return typeof d === 'object'
  }).map(stripData).map(getWords).filter(function (data) {
    return filterWords(data, args, notArgs)
  }).reduce(function (l, r) {
    l[r.name] = r
    return l
  }, {})
}

function stripData (data) {
  return {
    name: data.name,
    description: npm.config.get('description') ? data.description : '',
    maintainers: (data.maintainers || []).map(function (m) {
      return '=' + m.name
    }),
    url: !Object.keys(data.versions || {}).length ? data.url : null,
    keywords: data.keywords || [],
    version: Object.keys(data.versions || {})[0] || [],
    time: data.time &&
          data.time.modified &&
          (new Date(data.time.modified).toISOString() // remove time
            .split('T').join(' ')
            .replace(/:[0-9]{2}\.[0-9]{3}Z$/, ''))
            .slice(0, -5) ||
          'prehistoric'
  }
}

function getWords (data) {
  data.words = [ data.name ]
               .concat(data.description)
               .concat(data.maintainers)
               .concat(data.url && ('<' + data.url + '>'))
               .concat(data.keywords)
               .map(function (f) { return f && f.trim && f.trim() })
               .filter(function (f) { return f })
               .join(' ')
               .toLowerCase()
  return data
}

function filterWords (data, args, notArgs) {
  var words = data.words
  for (var i = 0, l = args.length; i < l; i++) {
    if (!match(words, args[i])) return false
  }
  for (i = 0, l = notArgs.length; i < l; i++) {
    if (match(words, notArgs[i])) return false
  }
  return true
}

function match (words, arg) {
  if (arg.charAt(0) === '/') {
    arg = arg.replace(/\/$/, '')
    arg = new RegExp(arg.substr(1, arg.length - 1))
    return words.match(arg)
  }
  return words.indexOf(arg) !== -1
}

function prettify (data, args) {
  var searchsort = (npm.config.get('searchsort') || 'NAME').toLowerCase()
  var sortField = searchsort.replace(/^\-+/, '')
  var searchRev = searchsort.charAt(0) === '-'
  var truncate = !npm.config.get('long')

  if (Object.keys(data).length === 0) {
    return 'No match found for ' + (args.map(JSON.stringify).join(' '))
  }

  var lines = Object.keys(data).map(function (d) {
    // strip keyname
    return data[d]
  }).map(function (dat) {
    dat.author = dat.maintainers
    delete dat.maintainers
    dat.date = dat.time
    delete dat.time
    return dat
  }).map(function (dat) {
    // split keywords on whitespace or ,
    if (typeof dat.keywords === 'string') {
      dat.keywords = dat.keywords.split(/[,\s]+/)
    }
    if (Array.isArray(dat.keywords)) {
      dat.keywords = dat.keywords.join(' ')
    }

    // split author on whitespace or ,
    if (typeof dat.author === 'string') {
      dat.author = dat.author.split(/[,\s]+/)
    }
    if (Array.isArray(dat.author)) {
      dat.author = dat.author.join(' ')
    }
    return dat
  })

  lines.sort(function (a, b) {
    var aa = a[sortField].toLowerCase()
    var bb = b[sortField].toLowerCase()
    return aa === bb ? 0
         : aa < bb ? -1 : 1
  })

  if (searchRev) lines.reverse()

  var columns = npm.config.get('description')
               ? ['name', 'description', 'author', 'date', 'version', 'keywords']
               : ['name', 'author', 'date', 'version', 'keywords']

  var output = columnify(
    lines,
    {
        include: columns,
        truncate: truncate,
        config: {
          name: { maxWidth: 40, truncate: false, truncateMarker: '' },
          description: { maxWidth: 60 },
          author: { maxWidth: 20 },
          date: { maxWidth: 11 },
          version: { maxWidth: 11 },
          keywords: { maxWidth: Infinity }
        }
    }
  )
  output = trimToMaxWidth(output)
  output = highlightSearchTerms(output, args)

  return output
}

var colors = [31, 33, 32, 36, 34, 35 ]
var cl = colors.length

function addColorMarker (str, arg, i) {
  var m = i % cl + 1
  var markStart = String.fromCharCode(m)
  var markEnd = String.fromCharCode(0)

  if (arg.charAt(0) === '/') {
    return str.replace(
      new RegExp(arg.substr(1, arg.length - 2), 'gi'),
      function (bit) { return markStart + bit + markEnd }
    )
  }

  // just a normal string, do the split/map thing
  var pieces = str.toLowerCase().split(arg.toLowerCase())
  var p = 0

  return pieces.map(function (piece) {
    piece = str.substr(p, piece.length)
    var mark = markStart +
               str.substr(p + piece.length, arg.length) +
               markEnd
    p += piece.length + arg.length
    return piece + mark
  }).join('')
}

function colorize (line) {
  for (var i = 0; i < cl; i++) {
    var m = i + 1
    var color = npm.color ? '\u001B[' + colors[i] + 'm' : ''
    line = line.split(String.fromCharCode(m)).join(color)
  }
  var uncolor = npm.color ? '\u001B[0m' : ''
  return line.split('\u0000').join(uncolor)
}

function getMaxWidth () {
  var cols
  try {
    var tty = require('tty')
    var stdout = process.stdout
    cols = !tty.isatty(stdout.fd) ? Infinity : process.stdout.getWindowSize()[0]
    cols = (cols === 0) ? Infinity : cols
  } catch (ex) { cols = Infinity }
  return cols
}

function trimToMaxWidth (str) {
  var maxWidth = getMaxWidth()
  return str.split('\n').map(function (line) {
    return line.slice(0, maxWidth)
  }).join('\n')
}

function highlightSearchTerms (str, terms) {
  terms.forEach(function (arg, i) {
    str = addColorMarker(str, arg, i)
  })

  return colorize(str).trim()
}