defmodule Eventos.Events do
  @moduledoc """
  The Events context.
  """

  import Ecto.Query, warn: false
  alias Eventos.Repo

  alias Eventos.Events.Event
  alias Eventos.Events.Comment
  alias Eventos.Actors.Actor

  @doc """
  Returns the list of events.

  ## Examples

      iex> list_events()
      [%Event{}, ...]

  """
  def list_events do
    events = Repo.all(Event)
    Repo.preload(events, [:organizer_actor])
  end

  def get_events_for_actor(%Actor{id: actor_id} = _actor, page \\ 1, limit \\ 10) do
    start = (page - 1) * limit

    query = from e in Event,
                 where: e.organizer_actor_id == ^actor_id,
                 limit: ^limit,
                 order_by: [desc: :id],
                 offset: ^start,
                 preload: [:organizer_actor, :category, :sessions, :tracks, :tags, :participants, :address]
    events = Repo.all(query)
    count_events = Repo.one(from e in Event, select: count(e.id), where: e.organizer_actor_id == ^actor_id)
    {:ok, events, count_events}
  end

  def count_local_events do
    Repo.one(
      from e in Event,
      select: count(e.id),
      where: e.local == ^true
    )
  end

  def count_local_comments do
    Repo.one(
      from c in Comment,
      select: count(c.id),
      where: c.local == ^true
    )
  end

  @doc """
  Gets a single event.

  Raises `Ecto.NoResultsError` if the Event does not exist.

  ## Examples

      iex> get_event!(123)
      %Event{}

      iex> get_event!(456)
      ** (Ecto.NoResultsError)

  """
  def get_event!(id), do: Repo.get!(Event, id)

  @doc """
  Gets an event by it's URL
  """
  def get_event_by_url!(url) do
    Repo.get_by(Event, url: url)
  end

  @doc """
  Gets a single event, with all associations loaded.
  """
  def get_event_full!(id) do
    event = Repo.get!(Event, id)
    Repo.preload(event, [:organizer_actor, :category, :sessions, :tracks, :tags, :participants, :address])
  end

  @doc """
  Gets an event by it's URL
  """
  def get_event_full_by_url!(url) do
    event = Repo.get_by(Event, url: url)
    Repo.preload(event, [:organizer_actor, :category, :sessions, :tracks, :tags, :participants, :address])
  end

  @spec get_event_full_by_name_and_slug!(String.t, String.t) :: Event.t
  def get_event_full_by_name_and_slug!(name, slug) do
    query = case String.split(name, "@") do
      [name, domain] -> from e in Event,
                             join: a in Actor,
                             on: a.id == e.organizer_actor_id and a.preferred_username == ^name and a.domain == ^domain,
                             where: e.slug == ^slug
      [name] -> from e in Event,
                     join: a in Actor,
                     on: a.id == e.organizer_actor_id and a.preferred_username == ^name and is_nil(a.domain),
                     where: e.slug == ^slug
    end
    event = Repo.one(query)
    Repo.preload(event, [:organizer_actor, :category, :sessions, :tracks, :tags, :participants, :address])
  end

  @doc """
  Find events by name
  """
  def find_events_by_name(name) do
    events = Repo.all from a in Event, where: ilike(a.title, ^like_sanitize(name))
    Repo.preload(events, [:organizer_actor])
  end

  @doc """
  Sanitize the LIKE queries
  """
  defp like_sanitize(value) do
    "%" <> String.replace(value, ~r/([\\%_])/, "\\1") <> "%"
  end

  @doc """
  Creates a event.

  ## Examples

      iex> create_event(%{field: value})
      {:ok, %Event{}}

      iex> create_event(%{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def create_event(attrs \\ %{}) do
    %Event{}
    |> Event.changeset(attrs)
    |> Repo.insert()
  end

  @doc """
  Updates a event.

  ## Examples

      iex> update_event(event, %{field: new_value})
      {:ok, %Event{}}

      iex> update_event(event, %{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def update_event(%Event{} = event, attrs) do
    event
    |> Event.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a Event.

  ## Examples

      iex> delete_event(event)
      {:ok, %Event{}}

      iex> delete_event(event)
      {:error, %Ecto.Changeset{}}

  """
  def delete_event(%Event{} = event) do
    Repo.delete(event)
  end

  @doc """
  Returns an `%Ecto.Changeset{}` for tracking event changes.

  ## Examples

      iex> change_event(event)
      %Ecto.Changeset{source: %Event{}}

  """
  def change_event(%Event{} = event) do
    Event.changeset(event, %{})
  end

  alias Eventos.Events.Category

  @doc """
  Returns the list of categories.

  ## Examples

      iex> list_categories()
      [%Category{}, ...]

  """
  def list_categories do
    Repo.all(Category)
  end

  @doc """
  Gets a single category.

  Raises `Ecto.NoResultsError` if the Category does not exist.

  ## Examples

      iex> get_category!(123)
      %Category{}

      iex> get_category!(456)
      ** (Ecto.NoResultsError)

  """
  def get_category!(id), do: Repo.get!(Category, id)

  @spec get_category_by_title(String.t) :: tuple()
  def get_category_by_title(title) when is_binary(title) do
    Repo.get_by(Category, title: title)
  end

  @doc """
  Creates a category.

  ## Examples

      iex> create_category(%{field: value})
      {:ok, %Category{}}

      iex> create_category(%{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def create_category(attrs \\ %{}) do
    %Category{}
    |> Category.changeset(attrs)
    |> Repo.insert()
  end

  @doc """
  Updates a category.

  ## Examples

      iex> update_category(category, %{field: new_value})
      {:ok, %Category{}}

      iex> update_category(category, %{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def update_category(%Category{} = category, attrs) do
    category
    |> Category.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a Category.

  ## Examples

      iex> delete_category(category)
      {:ok, %Category{}}

      iex> delete_category(category)
      {:error, %Ecto.Changeset{}}

  """
  def delete_category(%Category{} = category) do
    Repo.delete(category)
  end

  @doc """
  Returns an `%Ecto.Changeset{}` for tracking category changes.

  ## Examples

      iex> change_category(category)
      %Ecto.Changeset{source: %Category{}}

  """
  def change_category(%Category{} = category) do
    Category.changeset(category, %{})
  end

  alias Eventos.Events.Tag

  @doc """
  Returns the list of tags.

  ## Examples

      iex> list_tags()
      [%Tag{}, ...]

  """
  def list_tags do
    Repo.all(Tag)
  end

  @doc """
  Gets a single tag.

  Raises `Ecto.NoResultsError` if the Tag does not exist.

  ## Examples

      iex> get_tag!(123)
      %Tag{}

      iex> get_tag!(456)
      ** (Ecto.NoResultsError)

  """
  def get_tag!(id), do: Repo.get!(Tag, id)

  @doc """
  Creates a tag.

  ## Examples

      iex> create_tag(%{field: value})
      {:ok, %Tag{}}

      iex> create_tag(%{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def create_tag(attrs \\ %{}) do
    %Tag{}
    |> Tag.changeset(attrs)
    |> Repo.insert()
  end

  @doc """
  Updates a tag.

  ## Examples

      iex> update_tag(tag, %{field: new_value})
      {:ok, %Tag{}}

      iex> update_tag(tag, %{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def update_tag(%Tag{} = tag, attrs) do
    tag
    |> Tag.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a Tag.

  ## Examples

      iex> delete_tag(tag)
      {:ok, %Tag{}}

      iex> delete_tag(tag)
      {:error, %Ecto.Changeset{}}

  """
  def delete_tag(%Tag{} = tag) do
    Repo.delete(tag)
  end

  @doc """
  Returns an `%Ecto.Changeset{}` for tracking tag changes.

  ## Examples

      iex> change_tag(tag)
      %Ecto.Changeset{source: %Tag{}}

  """
  def change_tag(%Tag{} = tag) do
    Tag.changeset(tag, %{})
  end

  alias Eventos.Events.Participant

  @doc """
  Returns the list of participants.

  ## Examples

      iex> list_participants()
      [%Participant{}, ...]

  """
  def list_participants do
    Repo.all(Participant)
  end

  @doc """
  Gets a single participant.

  Raises `Ecto.NoResultsError` if the Participant does not exist.

  ## Examples

      iex> get_participant!(123)
      %Participant{}

      iex> get_participant!(456)
      ** (Ecto.NoResultsError)

  """
  def get_participant!(event_id, actor_id) do
    Repo.get_by!(Participant, [event_id: event_id, actor_id: actor_id])
  end

  @doc """
  Creates a participant.

  ## Examples

      iex> create_participant(%{field: value})
      {:ok, %Participant{}}

      iex> create_participant(%{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def create_participant(attrs \\ %{}) do
    %Participant{}
    |> Participant.changeset(attrs)
    |> Repo.insert()
  end

  @doc """
  Updates a participant.

  ## Examples

      iex> update_participant(participant, %{field: new_value})
      {:ok, %Participant{}}

      iex> update_participant(participant, %{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def update_participant(%Participant{} = participant, attrs) do
    participant
    |> Participant.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a Participant.

  ## Examples

      iex> delete_participant(participant)
      {:ok, %Participant{}}

      iex> delete_participant(participant)
      {:error, %Ecto.Changeset{}}

  """
  def delete_participant(%Participant{} = participant) do
    Repo.delete(participant)
  end

  @doc """
  Returns an `%Ecto.Changeset{}` for tracking participant changes.

  ## Examples

      iex> change_participant(participant)
      %Ecto.Changeset{source: %Participant{}}

  """
  def change_participant(%Participant{} = participant) do
    Participant.changeset(participant, %{})
  end

  def list_requests_for_actor(%Actor{} = actor) do
    Repo.all(from p in Participant, where: p.actor_id == ^actor.id and p.approved == false)
  end

  alias Eventos.Events.Session

  @doc """
  Returns the list of sessions.

  ## Examples

      iex> list_sessions()
      [%Session{}, ...]

  """
  def list_sessions do
    Repo.all(Session)
  end

  @doc """
  Returns the list of sessions for an event
  """
  def list_sessions_for_event(event_id) do
    Repo.all(from s in Session, where: s.event_id == ^event_id)
  end

  @doc """
  Returns the list of sessions for a track
  """
  def list_sessions_for_track(track_id) do
    Repo.all(from s in Session, where: s.track_id == ^track_id)
  end

  @doc """
  Gets a single session.

  Raises `Ecto.NoResultsError` if the Session does not exist.

  ## Examples

      iex> get_session!(123)
      %Session{}

      iex> get_session!(456)
      ** (Ecto.NoResultsError)

  """
  def get_session!(id), do: Repo.get!(Session, id)

  @doc """
  Creates a session.

  ## Examples

      iex> create_session(%{field: value})
      {:ok, %Session{}}

      iex> create_session(%{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def create_session(attrs \\ %{}) do
    %Session{}
    |> Session.changeset(attrs)
    |> Repo.insert()
  end

  @doc """
  Updates a session.

  ## Examples

      iex> update_session(session, %{field: new_value})
      {:ok, %Session{}}

      iex> update_session(session, %{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def update_session(%Session{} = session, attrs) do
    session
    |> Session.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a Session.

  ## Examples

      iex> delete_session(session)
      {:ok, %Session{}}

      iex> delete_session(session)
      {:error, %Ecto.Changeset{}}

  """
  def delete_session(%Session{} = session) do
    Repo.delete(session)
  end

  @doc """
  Returns an `%Ecto.Changeset{}` for tracking session changes.

  ## Examples

      iex> change_session(session)
      %Ecto.Changeset{source: %Session{}}

  """
  def change_session(%Session{} = session) do
    Session.changeset(session, %{})
  end

  alias Eventos.Events.Track

  @doc """
  Returns the list of tracks.

  ## Examples

      iex> list_tracks()
      [%Track{}, ...]

  """
  def list_tracks do
    Repo.all(Track)
  end

  @doc """
  Gets a single track.

  Raises `Ecto.NoResultsError` if the Track does not exist.

  ## Examples

      iex> get_track!(123)
      %Track{}

      iex> get_track!(456)
      ** (Ecto.NoResultsError)

  """
  def get_track!(id), do: Repo.get!(Track, id)

  @doc """
  Creates a track.

  ## Examples

      iex> create_track(%{field: value})
      {:ok, %Track{}}

      iex> create_track(%{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def create_track(attrs \\ %{}) do
    %Track{}
    |> Track.changeset(attrs)
    |> Repo.insert()
  end

  @doc """
  Updates a track.

  ## Examples

      iex> update_track(track, %{field: new_value})
      {:ok, %Track{}}

      iex> update_track(track, %{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def update_track(%Track{} = track, attrs) do
    track
    |> Track.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a Track.

  ## Examples

      iex> delete_track(track)
      {:ok, %Track{}}

      iex> delete_track(track)
      {:error, %Ecto.Changeset{}}

  """
  def delete_track(%Track{} = track) do
    Repo.delete(track)
  end

  @doc """
  Returns an `%Ecto.Changeset{}` for tracking track changes.

  ## Examples

      iex> change_track(track)
      %Ecto.Changeset{source: %Track{}}

  """
  def change_track(%Track{} = track) do
    Track.changeset(track, %{})
  end

  alias Eventos.Events.Comment

  @doc """
  Returns the list of comments.

  ## Examples

      iex> list_comments()
      [%Comment{}, ...]

  """
  def list_comments do
    Repo.all(Comment)
  end

  @doc """
  Gets a single comment.

  Raises `Ecto.NoResultsError` if the Comment does not exist.

  ## Examples

      iex> get_comment!(123)
      %Comment{}

      iex> get_comment!(456)
      ** (Ecto.NoResultsError)

  """
  def get_comment!(id), do: Repo.get!(Comment, id)

  @doc """
  Creates a comment.

  ## Examples

      iex> create_comment(%{field: value})
      {:ok, %Comment{}}

      iex> create_comment(%{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def create_comment(attrs \\ %{}) do
    %Comment{}
    |> Comment.changeset(attrs)
    |> Repo.insert()
  end

  @doc """
  Updates a comment.

  ## Examples

      iex> update_comment(comment, %{field: new_value})
      {:ok, %Comment{}}

      iex> update_comment(comment, %{field: bad_value})
      {:error, %Ecto.Changeset{}}

  """
  def update_comment(%Comment{} = comment, attrs) do
    comment
    |> Comment.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a Comment.

  ## Examples

      iex> delete_comment(comment)
      {:ok, %Comment{}}

      iex> delete_comment(comment)
      {:error, %Ecto.Changeset{}}

  """
  def delete_comment(%Comment{} = comment) do
    Repo.delete(comment)
  end

  @doc """
  Returns an `%Ecto.Changeset{}` for tracking comment changes.

  ## Examples

      iex> change_comment(comment)
      %Ecto.Changeset{source: %Comment{}}

  """
  def change_comment(%Comment{} = comment) do
    Comment.changeset(comment, %{})
  end
end