local db = require("lapis.db")
local to_json = require("lapis.util").to_json
local autoload = require("lapis.util").autoload
local preload = require("lapis.db.model").preload

local models = autoload("models")


local function Trackhandler(self)
  local track_id = self.params.track

  local track = models.Tracks:find({ id = track_id })
  if not track then
    self:write({"Not Found", status = 404})
    return
  end

  local hidden_fields = {
      "unique_name",
      "created_at",
      "updated_at"
    }

  for i, field in ipairs(hidden_fields) do
    track[field] = nil
  end

  -- find the artist for this track
  local artists = db.query([[
    SELECT artist.name AS artist_name
    FROM track_artists
    INNER JOIN
        artists AS artist ON (track_artists.artist = artist.id)
    WHERE track_artists.track = ?
  ]], track["id"])

  track["artist"] = artists[1]["artist_name"]

  -- find all airtimes for this track
  local track_airtimes = 0
  local airtimes = db.query([[
    SELECT airtime, station AS station_id
    FROM airtimes
    WHERE track = ?
  ]], track["id"])

  track["airtimes"] = {}
  for i, airtime in ipairs(airtimes) do
    track["airtimes"][i] = airtime
    track_airtimes = track_airtimes + 1
  end
  track["total_airtimes"] = track_airtimes

  -- find all releases for this track
  local releases = db.query([[
    SELECT release.id AS release_id, release.name AS release_name
    FROM track_releases
    INNER JOIN
      releases AS release ON (track_releases.release = release.id)
    WHERE track = ?
  ]], track["id"])

  track["releases"] = {}
  for i, release in ipairs(releases) do
    track["releases"][i] = release
  end

  return { json = track }

end

return Trackhandler