defmodule Microwaveprop.AccountsTest do
  use Microwaveprop.DataCase

  import Microwaveprop.AccountsFixtures

  alias Microwaveprop.Accounts
  alias Microwaveprop.Accounts.User
  alias Microwaveprop.Accounts.UserToken

  describe "get_user_by_email/1" do
    test "does not return the user if the email does not exist" do
      refute Accounts.get_user_by_email("unknown@example.com")
    end

    test "returns the user if the email exists" do
      %{id: id} = user = user_fixture()
      assert %User{id: ^id} = Accounts.get_user_by_email(user.email)
    end
  end

  describe "get_user_by_callsign/1" do
    test "returns the user for an exact callsign match" do
      %{id: id} = user = user_fixture(%{callsign: "W5ISP"})
      assert %User{id: ^id} = Accounts.get_user_by_callsign(user.callsign)
    end

    test "is case-insensitive so /u/w5isp and /u/W5ISP both resolve" do
      %{id: id} = user_fixture(%{callsign: "W5ISP"})
      assert %User{id: ^id} = Accounts.get_user_by_callsign("w5isp")
    end

    test "returns nil when no user matches" do
      refute Accounts.get_user_by_callsign("NO1SUCH")
    end

    test "returns nil for nil or empty callsign" do
      refute Accounts.get_user_by_callsign(nil)
      refute Accounts.get_user_by_callsign("")
    end
  end

  describe "get_user_by_email_and_password/2" do
    test "does not return the user if the email does not exist" do
      refute Accounts.get_user_by_email_and_password("unknown@example.com", "hello world!")
    end

    test "does not return the user if the password is not valid" do
      user = user_fixture()
      refute Accounts.get_user_by_email_and_password(user.email, "invalid")
    end

    test "returns the user if the email and password are valid" do
      %{id: id} = user = user_fixture()

      assert %User{id: ^id} =
               Accounts.get_user_by_email_and_password(user.email, valid_user_password())
    end
  end

  describe "get_user!/1" do
    test "raises if id is invalid" do
      assert_raise Ecto.NoResultsError, fn ->
        Accounts.get_user!("11111111-1111-1111-1111-111111111111")
      end
    end

    test "returns the user with the given id" do
      %{id: id} = user = user_fixture()
      assert %User{id: ^id} = Accounts.get_user!(user.id)
    end
  end

  describe "register_user/1" do
    test "requires callsign, name, email, and password" do
      {:error, changeset} = Accounts.register_user(%{})

      assert %{
               callsign: ["can't be blank"],
               name: ["can't be blank"],
               email: ["can't be blank"],
               password: ["can't be blank"]
             } = errors_on(changeset)
    end

    test "validates email format" do
      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(email: "not valid"))

      assert %{email: ["must have the @ sign and no spaces"]} = errors_on(changeset)
    end

    test "validates maximum email length for security" do
      too_long = String.duplicate("db", 100)

      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(email: too_long))

      assert "should be at most 160 character(s)" in errors_on(changeset).email
    end

    test "validates email uniqueness" do
      %{email: email} = user_fixture()

      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(email: email))

      assert "has already been taken" in errors_on(changeset).email

      # Uppercased should also collide (citext column).
      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(email: String.upcase(email)))

      assert "has already been taken" in errors_on(changeset).email
    end

    test "validates callsign format" do
      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(callsign: "no"))

      assert "must be 3-10 letters and digits" in errors_on(changeset).callsign
    end

    test "normalizes callsign to uppercase and enforces uniqueness" do
      %{callsign: callsign} = user_fixture(callsign: "w5test")
      assert callsign == "W5TEST"

      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(callsign: "w5test"))

      assert "has already been taken" in errors_on(changeset).callsign
    end

    test "validates password confirmation matches" do
      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(password: "hello world!", password_confirmation: "mismatch!!!!"))

      assert "does not match password" in errors_on(changeset).password_confirmation
    end

    test "validates password length" do
      {:error, changeset} =
        Accounts.register_user(valid_user_attributes(password: "short"))

      assert "should be at least 8 character(s)" in errors_on(changeset).password
    end

    test "registers a valid user but leaves them unconfirmed" do
      attrs = valid_user_attributes()
      {:ok, user} = Accounts.register_user(attrs)

      assert user.email == attrs.email
      assert user.callsign == String.upcase(attrs.callsign)
      assert user.name == attrs.name
      assert is_binary(user.hashed_password)
      assert is_nil(user.password)
      assert is_nil(user.confirmed_at)
      refute user.is_admin
    end

    test "grants is_admin to the configured admin email" do
      {:ok, user} =
        Accounts.register_user(valid_user_attributes(email: User.admin_email()))

      assert user.is_admin
    end

    test "grants is_admin regardless of email case" do
      upper = String.upcase(User.admin_email())
      {:ok, user} = Accounts.register_user(valid_user_attributes(email: upper))
      assert user.is_admin
    end

    test "does not grant is_admin to other emails" do
      {:ok, user} = Accounts.register_user(valid_user_attributes())
      refute user.is_admin
    end
  end

  describe "deliver_user_confirmation_instructions/2" do
    test "sends token through notification" do
      user = unconfirmed_user_fixture()

      token =
        extract_user_token(fn url ->
          Accounts.deliver_user_confirmation_instructions(user, url)
        end)

      {:ok, token} = Base.url_decode64(token, padding: false)
      assert user_token = Repo.get_by(UserToken, token: :crypto.hash(:sha256, token))
      assert user_token.user_id == user.id
      assert user_token.sent_to == user.email
      assert user_token.context == "confirm"
    end

    test "returns {:error, :already_confirmed} when the user is already confirmed" do
      user = user_fixture()

      assert {:error, :already_confirmed} =
               Accounts.deliver_user_confirmation_instructions(user, & &1)
    end
  end

  describe "confirm_user_by_token/1" do
    setup do
      user = unconfirmed_user_fixture()

      token =
        extract_user_token(fn url ->
          Accounts.deliver_user_confirmation_instructions(user, url)
        end)

      %{user: user, token: token}
    end

    test "confirms the user with a valid token", %{user: user, token: token} do
      assert {:ok, {confirmed_user, _}} = Accounts.confirm_user_by_token(token)
      assert confirmed_user.id == user.id
      assert confirmed_user.confirmed_at
      refute Repo.get_by(UserToken, user_id: user.id)
    end

    test "does not confirm with invalid token" do
      assert {:error, :not_found} = Accounts.confirm_user_by_token("oops")
    end

    test "does not confirm with expired token", %{token: token} do
      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: ~N[2020-01-01 00:00:00]])
      assert {:error, :not_found} = Accounts.confirm_user_by_token(token)
    end
  end

  describe "deliver_user_reset_password_instructions/2" do
    test "sends token through notification" do
      user = user_fixture()

      token =
        extract_user_token(fn url ->
          Accounts.deliver_user_reset_password_instructions(user, url)
        end)

      {:ok, token} = Base.url_decode64(token, padding: false)
      assert user_token = Repo.get_by(UserToken, token: :crypto.hash(:sha256, token))
      assert user_token.user_id == user.id
      assert user_token.sent_to == user.email
      assert user_token.context == "reset_password"
    end
  end

  describe "get_user_by_reset_password_token/1" do
    setup do
      user = user_fixture()

      token =
        extract_user_token(fn url ->
          Accounts.deliver_user_reset_password_instructions(user, url)
        end)

      %{user: user, token: token}
    end

    test "returns the user with valid token", %{user: %{id: id}, token: token} do
      assert %User{id: ^id} = Accounts.get_user_by_reset_password_token(token)
    end

    test "does not return the user with invalid token" do
      refute Accounts.get_user_by_reset_password_token("oops")
    end

    test "does not return the user if token expired", %{token: token} do
      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: ~N[2020-01-01 00:00:00]])
      refute Accounts.get_user_by_reset_password_token(token)
    end

    test "does not return the user with a confirm-context token" do
      user = unconfirmed_user_fixture()

      confirm_token =
        extract_user_token(fn url ->
          Accounts.deliver_user_confirmation_instructions(user, url)
        end)

      refute Accounts.get_user_by_reset_password_token(confirm_token)
    end
  end

  describe "reset_user_password/2" do
    setup do
      %{user: user_fixture()}
    end

    test "validates password length", %{user: user} do
      {:error, changeset} = Accounts.reset_user_password(user, %{password: "short"})
      assert %{password: ["should be at least 8 character(s)"]} = errors_on(changeset)
    end

    test "updates the password", %{user: user} do
      {:ok, {user, _tokens}} =
        Accounts.reset_user_password(user, %{password: "new valid password"})

      assert is_nil(user.password)
      assert Accounts.get_user_by_email_and_password(user.email, "new valid password")
    end

    test "deletes all tokens for the given user", %{user: user} do
      _ = Accounts.generate_user_session_token(user)
      {:ok, _} = Accounts.reset_user_password(user, %{password: "new valid password"})
      refute Repo.get_by(UserToken, user_id: user.id)
    end
  end

  describe "change_user_registration/2" do
    test "returns a changeset without hashing the password" do
      changeset = Accounts.change_user_registration(%User{})
      assert %Ecto.Changeset{} = changeset
      assert :callsign in changeset.required
      assert :name in changeset.required
      assert :email in changeset.required
      assert :password in changeset.required
    end
  end

  describe "sudo_mode?/2" do
    test "validates the authenticated_at time" do
      now = DateTime.utc_now()

      assert Accounts.sudo_mode?(%User{authenticated_at: DateTime.utc_now()})
      assert Accounts.sudo_mode?(%User{authenticated_at: DateTime.add(now, -19, :minute)})
      refute Accounts.sudo_mode?(%User{authenticated_at: DateTime.add(now, -21, :minute)})

      # minute override
      refute Accounts.sudo_mode?(
               %User{authenticated_at: DateTime.add(now, -11, :minute)},
               -10
             )

      # not authenticated
      refute Accounts.sudo_mode?(%User{})
    end
  end

  describe "change_user_email/3" do
    test "returns a user changeset" do
      assert %Ecto.Changeset{} = changeset = Accounts.change_user_email(%User{})
      assert changeset.required == [:email]
    end
  end

  describe "deliver_user_update_email_instructions/3" do
    setup do
      %{user: user_fixture()}
    end

    test "sends token through notification", %{user: user} do
      token =
        extract_user_token(fn url ->
          Accounts.deliver_user_update_email_instructions(user, "current@example.com", url)
        end)

      {:ok, token} = Base.url_decode64(token, padding: false)
      assert user_token = Repo.get_by(UserToken, token: :crypto.hash(:sha256, token))
      assert user_token.user_id == user.id
      assert user_token.sent_to == user.email
      assert user_token.context == "change:current@example.com"
    end
  end

  describe "update_user_email/2" do
    setup do
      user = user_fixture()
      email = unique_user_email()

      token =
        extract_user_token(fn url ->
          Accounts.deliver_user_update_email_instructions(%{user | email: email}, user.email, url)
        end)

      %{user: user, token: token, email: email}
    end

    test "updates the email with a valid token", %{user: user, token: token, email: email} do
      assert {:ok, %{email: ^email}} = Accounts.update_user_email(user, token)
      changed_user = Repo.get!(User, user.id)
      assert changed_user.email != user.email
      assert changed_user.email == email
      refute Repo.get_by(UserToken, user_id: user.id)
    end

    test "does not update email with invalid token", %{user: user} do
      assert Accounts.update_user_email(user, "oops") ==
               {:error, :transaction_aborted}

      assert Repo.get!(User, user.id).email == user.email
      assert Repo.get_by(UserToken, user_id: user.id)
    end

    test "does not update email if user email changed", %{user: user, token: token} do
      assert Accounts.update_user_email(%{user | email: "current@example.com"}, token) ==
               {:error, :transaction_aborted}

      assert Repo.get!(User, user.id).email == user.email
      assert Repo.get_by(UserToken, user_id: user.id)
    end

    test "does not update email if token expired", %{user: user, token: token} do
      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: ~N[2020-01-01 00:00:00]])

      assert Accounts.update_user_email(user, token) ==
               {:error, :transaction_aborted}

      assert Repo.get!(User, user.id).email == user.email
      assert Repo.get_by(UserToken, user_id: user.id)
    end
  end

  describe "change_user_password/3" do
    test "returns a user changeset" do
      assert %Ecto.Changeset{} = changeset = Accounts.change_user_password(%User{})
      assert changeset.required == [:password]
    end

    test "allows fields to be set" do
      changeset =
        Accounts.change_user_password(
          %User{},
          %{
            "password" => "new valid password"
          },
          hash_password: false
        )

      assert changeset.valid?
      assert get_change(changeset, :password) == "new valid password"
      assert is_nil(get_change(changeset, :hashed_password))
    end
  end

  describe "update_user_password/2" do
    setup do
      %{user: user_fixture()}
    end

    test "validates password", %{user: user} do
      {:error, changeset} =
        Accounts.update_user_password(user, %{
          password: "short",
          password_confirmation: "other"
        })

      assert %{
               password: ["should be at least 8 character(s)"],
               password_confirmation: ["does not match password"]
             } = errors_on(changeset)
    end

    test "validates maximum values for password for security", %{user: user} do
      too_long = String.duplicate("db", 100)

      {:error, changeset} =
        Accounts.update_user_password(user, %{password: too_long})

      assert "should be at most 72 character(s)" in errors_on(changeset).password
    end

    test "updates the password", %{user: user} do
      {:ok, {user, expired_tokens}} =
        Accounts.update_user_password(user, %{
          password: "new valid password"
        })

      assert expired_tokens == []
      assert is_nil(user.password)
      assert Accounts.get_user_by_email_and_password(user.email, "new valid password")
    end

    test "deletes all tokens for the given user", %{user: user} do
      _ = Accounts.generate_user_session_token(user)

      {:ok, {_, _}} =
        Accounts.update_user_password(user, %{
          password: "new valid password"
        })

      refute Repo.get_by(UserToken, user_id: user.id)
    end
  end

  describe "generate_user_session_token/1" do
    setup do
      %{user: user_fixture()}
    end

    test "generates a token", %{user: user} do
      token = Accounts.generate_user_session_token(user)
      assert user_token = Repo.get_by(UserToken, token: token)
      assert user_token.context == "session"
      assert user_token.authenticated_at

      # Creating the same token for another user should fail
      assert_raise Ecto.ConstraintError, fn ->
        Repo.insert!(%UserToken{
          token: user_token.token,
          user_id: user_fixture().id,
          context: "session"
        })
      end
    end

    test "duplicates the authenticated_at of given user in new token", %{user: user} do
      user = %{user | authenticated_at: DateTime.add(DateTime.utc_now(:second), -3600)}
      token = Accounts.generate_user_session_token(user)
      assert user_token = Repo.get_by(UserToken, token: token)
      assert user_token.authenticated_at == user.authenticated_at
      assert DateTime.after?(user_token.inserted_at, user.authenticated_at)
    end
  end

  describe "get_user_by_session_token/1" do
    setup do
      user = user_fixture()
      token = Accounts.generate_user_session_token(user)
      %{user: user, token: token}
    end

    test "returns user by token", %{user: user, token: token} do
      assert {session_user, token_inserted_at} = Accounts.get_user_by_session_token(token)
      assert session_user.id == user.id
      assert session_user.authenticated_at
      assert token_inserted_at
    end

    test "does not return user for invalid token" do
      refute Accounts.get_user_by_session_token("oops")
    end

    test "does not return user for expired token", %{token: token} do
      dt = ~N[2020-01-01 00:00:00]
      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: dt, authenticated_at: dt])
      refute Accounts.get_user_by_session_token(token)
    end
  end

  describe "delete_user_session_token/1" do
    test "deletes the token" do
      user = user_fixture()
      token = Accounts.generate_user_session_token(user)
      assert Accounts.delete_user_session_token(token) == :ok
      refute Accounts.get_user_by_session_token(token)
    end
  end

  describe "inspect/2 for the User module" do
    test "does not include password" do
      refute inspect(%User{password: "123456"}) =~ "password: \"123456\""
    end
  end
end