require "rails_helper"

RSpec.describe "Registrations API", type: :request do
  describe "POST /api/register" do
    let(:valid_attributes) do
      {
        user: {
          nickname: "Sinbad",
          password: "password123"
        }
      }
    end

    context "with valid parameters" do
      it "registers a new user and returns 201 Created with token" do
        expect {
          post "/api/register", params: valid_attributes, as: :json
        }.to change(User, :count).by(1)

        expect(response).to have_http_status(:created)
        json = JSON.parse(response.body)

        expect(json["token"]).to be_present
        expect(json["user"]["nickname"]).to eq("Sinbad")
        expect(json["user"]["id"]).to eq(User.last.id)
        expect(json["user"]["avatar_url"]).to be_nil
        expect(json["user"]["created_at"]).to be_present
      end
    end

    context "with invalid parameters" do
      it "returns 422 Unprocessable Content when nickname is taken" do
        User.create!(nickname: "Sinbad", password: "password123")

        post "/api/register", params: valid_attributes, as: :json

        expect(response).to have_http_status(422)
        json = JSON.parse(response.body)
        expect(json["errors"]).to include("Nickname has already been taken")
      end

      it "returns 422 Unprocessable Content when password is too short" do
        invalid_attrs = { user: { nickname: "Sinbad", password: "123" } }
        post "/api/register", params: invalid_attrs, as: :json

        expect(response).to have_http_status(422)
        json = JSON.parse(response.body)
        expect(json["errors"]).to include("Password is too short (minimum is 6 characters)")
      end
    end
  end
end