import trim from require "lapis.util"

import Tracks from require "models"

process_tags = (tags_str) ->
  -- split into a table to garuntee uniqueness
  unique = {}
  for tag in tags_str\gmatch "%S+"
    unique[tag\lower!] = true
  -- place back into an array
  taglist = {}
  for tag in pairs unique
    table.insert taglist, tag
  table.sort taglist
  return " #{table.concat taglist, " "} "

update_track = (user_input) ->
  updates = {}
  -- automatic tags
  for field in *{"artist", "mood", "link", "genre"}
    if user_input[field] and #user_input[field] > 0
      if user_input.tags
        user_input.tags ..= " #{field}:#{user_input[field]\gsub "%s+", "_"}"
      else
        user_input.tags = "#{field}:#{user_input[field]\gsub "%s+", "_"}"
  -- update all fields
  for field in pairs Tracks.fields
    if user_input[field]
      switch field
        when "status"
          updates.status = tonumber user_input.status
        when "quality"
          updates.quality = tonumber user_input.quality
        when "tags"
          updates.tags = process_tags user_input.tags
        when "id"
          nil -- IDs cannot be modified
        else
          updates[field] = trim user_input[field]

  if user_input.id
    if track = Tracks\find id: tonumber user_input.id
      return track\update updates
  else
    return Tracks\create updates

return {
  :process_tags
  :update_track
  create_track: update_track
}