defmodule Diffuser.Accounts do
  @moduledoc """
  The Accounts context.
  """

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

  alias Diffuser.Accounts.User
  alias Diffuser.Generator.PromptRequest

  @doc """
  Returns the list of users.

  ## Examples

      iex> list_users()
      [%User{}, ...]

  """
  def list_users do
    Repo.all(User)
  end

  @doc """
  Gets a single user.

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

  ## Examples

      iex> get_user!(123)
      %User{}

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

  """
  def get_user!(id), do: Repo.get!(User, id) |> Repo.preload(votes: [:prompt_request])

  @doc """
  Creates a user.

  ## Examples

      iex> create_user(%{field: value})
      {:ok, %User{}}

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

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

  @doc """
  Updates a user.

  ## Examples

      iex> update_user(user, %{field: new_value})
      {:ok, %User{}}

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

  """
  def update_user(%User{} = user, attrs) do
    user
    |> User.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a user.

  ## Examples

      iex> delete_user(user)
      {:ok, %User{}}

      iex> delete_user(user)
      {:error, %Ecto.Changeset{}}

  """
  def delete_user(%User{} = user) do
    Repo.delete(user)
  end

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

  ## Examples

      iex> change_user(user)
      %Ecto.Changeset{data: %User{}}

  """
  def change_user(%User{} = user, attrs \\ %{}) do
    User.changeset(user, attrs)
  end

  alias Diffuser.Accounts.Vote

  @doc """
  Returns the list of votes.

  ## Examples

      iex> list_votes()
      [%Vote{}, ...]

  """
  def list_votes do
    Repo.all(Vote)
  end

  @doc """
  Gets a single vote.

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

  ## Examples

      iex> get_vote!(123)
      %Vote{}

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

  """
  def get_vote!(id), do: Repo.get!(Vote, id)

  @doc """
  Creates a vote.

  ## Examples

      iex> create_vote(%{field: value})
      {:ok, %Vote{}}

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

  """
  def create_vote(%{user: user} = attrs) do
    %Vote{}
    |> Vote.changeset(attrs)
    |> Ecto.Changeset.put_assoc(:user, user)
    |> Repo.insert()
  end

  @doc """
  Updates a vote.

  ## Examples

      iex> update_vote(vote, %{field: new_value})
      {:ok, %Vote{}}

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

  """
  def update_vote(%Vote{} = vote, attrs) do
    vote
    |> Vote.changeset(attrs)
    |> Repo.update()
  end

  @doc """
  Deletes a vote.

  ## Examples

      iex> delete_vote(vote)
      {:ok, %Vote{}}

      iex> delete_vote(vote)
      {:error, %Ecto.Changeset{}}

  """
  def delete_vote(%Vote{} = vote) do
    Repo.delete(vote)
  end

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

  ## Examples

      iex> change_vote(vote)
      %Ecto.Changeset{data: %Vote{}}

  """
  def change_vote(%Vote{} = vote, attrs \\ %{}) do
    Vote.changeset(vote, attrs)
  end

  def upvote(user, %PromptRequest{id: pr}),
    do: create_vote(%{prompt_request_id: pr, user: user})
end