space_game_server/spec/game/game_spec.rb

# frozen_string_literal: true

# Nathan Hinton, 24 Dec 2025
# Test file for the game.

require 'rspec'
require 'socket'
require 'json'
require_relative '../../lib/game/game' # adjust the path if you keep the lib in another folder
require_relative '../../lib/game/planet' # adjust the path if you keep the lib in another folder

module Game
  RSpec.describe Game do
    let(:player_defaults) do
      {
        'credits'  => 1000,
        'metal'    => 200,
        'crystals' => 50,
        'fuel'     => 300
      }
    end

    let(:conf) do
      {
        'name'            => 'TestGalaxy',
        'width'           => 1000,
        'height'          => 800,
        'depth'           => 500,
        'time'            => 0.0,
        'player_defaults' => player_defaults,
        'players'         => [],
        'planets'         => [],
        'ships'           => []
      }
    end

    describe '#initialize' do
      it 'creates a game instance with the supplied config' do
        game = Game.new(conf)
        expect(game.name).to eq('TestGalaxy')
        expect(game.width).to eq(1000)
        expect(game.height).to eq(800)
        expect(game.depth).to eq(500)
        expect(game.players).to be_empty
      end

      it 'raises when a required key is missing' do
        bad_conf = conf.dup.delete('name')
        expect { Game.new(conf) }.not_to raise_error

        # Missing the mandatory “name” key
        conf_without_name = conf.merge('name' => nil)
        expect { Game.new(conf_without_name) }.to raise_error(ArgumentError)
      end
    end

    describe '#player_connect' do
      let(:game) { Game.new(conf) }
      let(:client_socket) { instance_double(TCPSocket) }

      context 'when the player already exists and is disconnected' do
        let(:player_id) { 'player123' }
        let(:existing_player) { instance_double('Player', player_id: player_id, connected?: false, connect: true) }

        before do
          allow(game).to receive(:player_registered?).with(player_id).and_return(existing_player)
          allow(existing_player).to receive(:connected?).and_return(false)
          allow(existing_player).to receive(:connect).with(client_socket)
        end

        it 're-connects the player and returns success' do
          cmd = { 'payload' => { 'player_id' => player_id, 'faction' => 'good' } }
          expect(game.player_connect(client_socket, cmd)).to eq({"payload"=>"success", "type"=>"update"})
          expect(existing_player).to have_received(:connect).with(client_socket)
        end
      end

      context 'when the player is already connected' do
        let(:player_id) { 'dup' }
        let(:existing_player) { instance_double('Player', player_id:, connected?: true) }

        before do
          allow(game).to receive(:player_registered?).with(player_id).and_return(existing_player)
        end

        it 'raises a GameError' do
          cmd = { 'payload' => { 'player_id' => player_id, 'faction' => 'good' } }
          expect { game.player_connect(client_socket, cmd) }
            .to raise_error(GameError, 'Player already connected!')
        end
      end

      context 'when the player is new' do
        let(:player_id) { 'newplayer' }

        before do
          allow(game).to receive(:player_registered?).with(player_id).and_return(false)
          allow(game).to receive(:create_player).with(player_id, 'evil').and_return(
            instance_double('Player', player_id:, connect: true)
          )
        end

        it 'creates a new player, connects them, and adds them to #players' do
          cmd = { 'payload' => { 'player_id' => player_id, 'faction' => 'evil'} }
          response = game.player_connect(client_socket, cmd)
          expect(response).to eq({"payload"=>"success", "type"=>"update"})
          expect(game.players).to include(an_object_having_attributes(player_id:))
        end
      end

      context 'when the command is missing a player_id' do
        it 'raises an ArgumentError' do
          expect { game.player_connect(client_socket, {}) }
            .to raise_error(ArgumentError, /player_id missing/)
        end
      end
    end

    describe '#create_player' do
      let(:game) { Game.new(conf) }
      let(:planet)  { Planet.new(1, 1, 0) }
      let(:planet2) { Planet.new(1, 1, 0)  }

      before do
        game.instance_variable_set('@planets', [planet, planet2])
      end

      it 'returns a Player instance with the requested id' do
        expect(game.create_player('foo', 'good')).to be_a(Player)
      end
    end

    describe '#player_registered?' do
      let(:game) { Game.new(conf) }

      it 'returns false if no players exist' do
        expect(game.player_registered?('foo')).to be false
      end

      it 'returns the Player when id matches' do
        new_player = instance_double('Player', player_id: 'match')
        game.instance_variable_set('@players', [new_player])
        allow(game).to receive(:players).and_return([new_player])
        expect(game.player_registered?('match')).to eq(new_player)
      end
    end

    describe '#info' do
      it 'returns the game time in JSON format' do
        game = Game.new(conf)
        expect(JSON.parse(game.info(0))['payload']['time']).to eq(0.0)
      end
    end

    describe '#save_game_state' do
      let(:game) { Game.new(conf) }
      let(:file_content) { StringIO.new }

      before do
        allow(File).to receive(:open).and_yield(file_content)
      end

      it 'writes a YAML configuration containing the game time and attributes' do
        game.save_game_state
        yaml_output = YAML.safe_load(file_content.string)

        expect(yaml_output['name']).to eq('TestGalaxy')
        expect(yaml_output['time']).to eq(0.0)
      end
    end
  end
end