evening_detective_server/internal/services/answer_service/service.go

package answer_service

import (
	"context"
	"errors"
	"evening_detective_server/internal/modules/storytelling"
	"evening_detective_server/internal/repos"
	"evening_detective_server/internal/repos/actions_repo"
	"evening_detective_server/internal/repos/games_repo"
	"evening_detective_server/internal/repos/team_answers_repo"
	"evening_detective_server/internal/repos/teams_repo"
	"evening_detective_server/internal/services/game_model"
	"evening_detective_server/internal/services/scenarios_service"
)

// AnswerService handles game answers.
type AnswerService struct {
	gamesRepo       *games_repo.GamesRepo
	teamsRepo       *teams_repo.TeamsRepo
	scenarioService *scenarios_service.ScenarioService
	answersRepo     *team_answers_repo.TeamAnswersRepo
	actionsRepo     *actions_repo.ActionsRepo
}

// NewAnswerService creates an answer service.
func NewAnswerService(
	gamesRepo *games_repo.GamesRepo,
	teamsRepo *teams_repo.TeamsRepo,
	scenarioService *scenarios_service.ScenarioService,
	answersRepo *team_answers_repo.TeamAnswersRepo,
	actionsRepo *actions_repo.ActionsRepo,
) *AnswerService {
	return &AnswerService{
		gamesRepo:       gamesRepo,
		teamsRepo:       teamsRepo,
		scenarioService: scenarioService,
		answersRepo:     answersRepo,
		actionsRepo:     actionsRepo,
	}
}

var (
	ErrTeamNotFound     = errors.New("команда не найдена")
	ErrGameNotFound     = errors.New("игра не найдена")
	ErrGameFinished     = errors.New("игра завершена, ответы больше нельзя изменять")
	ErrGameNotStarted   = errors.New("игра не начата, отвечать на вопросы нельзя")
	ErrQuestionNotFound = errors.New("вопрос не найден")
	ErrGameNotFinished  = errors.New("итоги доступны после завершения игры")
	ErrOfflineAnswers   = errors.New("в offline-игре ответы через сайт недоступны")
)

func (s *AnswerService) getTeamAndGame(ctx context.Context, teamID string, password string) (*repos.Team, *repos.Game, error) {
	team, err := s.teamsRepo.GetTeamByID(ctx, teamID)
	if err != nil {
		if errors.Is(err, teams_repo.ErrTeamNotFound) {
			return nil, nil, ErrTeamNotFound
		}
		return nil, nil, err
	}
	if team.Password != password || team.ParticipationStatus == "cancelled" {
		return nil, nil, ErrTeamNotFound
	}
	game, err := s.gamesRepo.GetGameByID(ctx, team.GameID)
	if err != nil {
		if errors.Is(err, games_repo.ErrGameNotFound) {
			return nil, nil, ErrGameNotFound
		}
		return nil, nil, err
	}
	return team, game, nil
}

func (s *AnswerService) getScenarioQuestionsByCode(ctx context.Context, scenarioID int) ([]*storytelling.Question, map[string]*storytelling.Question, error) {
	scenario, err := s.scenarioService.GetFullScenarioByID(ctx, scenarioID)
	if err != nil {
		return nil, nil, err
	}
	byCode := make(map[string]*storytelling.Question, len(scenario.Story.Questions))
	for _, question := range scenario.Story.Questions {
		byCode[question.Code] = question
	}
	return scenario.Story.Questions, byCode, nil
}

func (s *AnswerService) GetTeamAnswers(ctx context.Context, teamID string, password string) ([]Answer, error) {
	_, game, err := s.getTeamAndGame(ctx, teamID, password)
	if err != nil {
		return nil, err
	}
	if game.Format == "offline" {
		return nil, nil
	}
	_, byCode, err := s.getScenarioQuestionsByCode(ctx, game.ScenarioID)
	if err != nil {
		return nil, err
	}
	teamAnswers, err := s.answersRepo.GetAnswersByTeamID(ctx, teamID)
	if err != nil {
		return nil, err
	}
	answers := make([]Answer, 0, len(teamAnswers))
	for _, teamAnswer := range teamAnswers {
		if _, ok := byCode[teamAnswer.QuestionCode]; !ok {
			continue
		}
		answers = append(answers, Answer{
			QuestionCode: teamAnswer.QuestionCode,
			Text:         teamAnswer.Text,
		})
	}
	return answers, nil
}

func (s *AnswerService) SubmitTeamAnswers(ctx context.Context, teamID string, password string, answers []Answer) error {
	_, game, err := s.getTeamAndGame(ctx, teamID, password)
	if err != nil {
		return err
	}
	if game.Format == "offline" {
		return ErrOfflineAnswers
	}
	switch game.Status {
	case "run", "pause":
	default:
		if game.Status == "finish" {
			return ErrGameFinished
		}
		return ErrGameNotStarted
	}
	_, byCode, err := s.getScenarioQuestionsByCode(ctx, game.ScenarioID)
	if err != nil {
		return err
	}
	rows := make([]repos.TeamAnswer, 0, len(answers))
	for _, answer := range answers {
		if _, ok := byCode[answer.QuestionCode]; !ok {
			return ErrQuestionNotFound
		}
		rows = append(rows, repos.TeamAnswer{
			QuestionCode: answer.QuestionCode,
			Text:         answer.Text,
		})
	}
	return s.answersRepo.UpsertAnswers(ctx, teamID, rows)
}

func (s *AnswerService) GetGameAnswers(ctx context.Context, gameID int) (*GameAnswers, error) {
	game, err := s.gamesRepo.GetGameByID(ctx, gameID)
	if err != nil {
		return nil, mapAnswerError(err)
	}
	questions, byCode, err := s.getScenarioQuestionsByCode(ctx, game.ScenarioID)
	if err != nil {
		return nil, err
	}
	teams, err := s.teamsRepo.GetActiveTeamsByGameID(ctx, gameID)
	if err != nil {
		return nil, err
	}
	teamIDs := make([]string, 0, len(teams))
	for _, team := range teams {
		teamIDs = append(teamIDs, team.ID)
	}
	actionsCountByTeamIDs, err := s.actionsRepo.GetActionsCountByTeamIDs(ctx, teamIDs)
	if err != nil {
		return nil, err
	}
	rows, err := s.answersRepo.GetAnswersByGameID(ctx, gameID)
	if err != nil {
		return nil, err
	}
	answerByTeamAndCode := make(map[string]map[string]AnswerScore, len(teams))
	for _, row := range rows {
		if _, ok := byCode[row.QuestionCode]; !ok {
			continue
		}
		score := row.Score
		if answerByTeamAndCode[row.TeamID] == nil {
			answerByTeamAndCode[row.TeamID] = make(map[string]AnswerScore, len(questions))
		}
		answerByTeamAndCode[row.TeamID][row.QuestionCode] = AnswerScore{
			QuestionCode: row.QuestionCode,
			Text:         row.Text,
			Score:        score,
		}
	}
	teamAnswers := make([]TeamAnswers, 0, len(teams))
	for _, team := range teams {
		byCode := answerByTeamAndCode[team.ID]
		answers := make([]AnswerScore, 0, len(questions))
		for _, question := range questions {
			if answer, ok := byCode[question.Code]; ok {
				answers = append(answers, answer)
				continue
			}
			answers = append(answers, AnswerScore{QuestionCode: question.Code})
		}
		mappedTeam := game_model.MapTeam(team)
		mappedTeam.ActionsCount = actionsCountByTeamIDs[team.ID]
		teamAnswers = append(teamAnswers, TeamAnswers{
			Team:    mappedTeam,
			Answers: answers,
		})
	}
	return &GameAnswers{
		Questions: questions,
		Teams:     teamAnswers,
	}, nil
}

func (s *AnswerService) SetTeamAnswerScore(ctx context.Context, teamID string, questionCode string, score *int) error {
	team, err := s.teamsRepo.GetTeamByID(ctx, teamID)
	if err != nil {
		return mapAnswerError(err)
	}
	game, err := s.gamesRepo.GetGameByID(ctx, team.GameID)
	if err != nil {
		return mapAnswerError(err)
	}
	_, byCode, err := s.getScenarioQuestionsByCode(ctx, game.ScenarioID)
	if err != nil {
		return err
	}
	if _, ok := byCode[questionCode]; !ok {
		return ErrQuestionNotFound
	}
	return s.answersRepo.SetAnswerScore(ctx, teamID, questionCode, score)
}

func (s *AnswerService) GetGameResults(ctx context.Context, gameID int) (*GameResults, error) {
	game, err := s.gamesRepo.GetGameByID(ctx, gameID)
	if err != nil {
		return nil, mapAnswerError(err)
	}
	if game.Status != "finish" {
		return nil, ErrGameNotFinished
	}
	questions, byCode, err := s.getScenarioQuestionsByCode(ctx, game.ScenarioID)
	if err != nil {
		return nil, err
	}
	teams, err := s.teamsRepo.GetActiveTeamsByGameID(ctx, gameID)
	if err != nil {
		return nil, err
	}
	teamIDs := make([]string, 0, len(teams))
	for _, team := range teams {
		teamIDs = append(teamIDs, team.ID)
	}
	actionsCountByTeamIDs, err := s.actionsRepo.GetActionsCountByTeamIDs(ctx, teamIDs)
	if err != nil {
		return nil, err
	}
	rows, err := s.answersRepo.GetAnswersByGameID(ctx, gameID)
	if err != nil {
		return nil, err
	}
	answerByTeamAndCode := make(map[string]map[string]AnswerScore, len(teams))
	for _, row := range rows {
		if _, ok := byCode[row.QuestionCode]; !ok {
			continue
		}
		if answerByTeamAndCode[row.TeamID] == nil {
			answerByTeamAndCode[row.TeamID] = make(map[string]AnswerScore, len(questions))
		}
		answerByTeamAndCode[row.TeamID][row.QuestionCode] = AnswerScore{
			QuestionCode: row.QuestionCode,
			Text:         row.Text,
			Score:        row.Score,
		}
	}
	mappedTeams := make([]*game_model.Team, 0, len(teams))
	for _, team := range teams {
		mapped := game_model.MapTeam(team)
		mapped.ActionsCount = actionsCountByTeamIDs[team.ID]
		mappedTeams = append(mappedTeams, mapped)
	}
	return &GameResults{
		Questions: questions,
		Teams:     rankTeams(buildTeamResults(questions, mappedTeams, answerByTeamAndCode)),
	}, nil
}

func mapAnswerError(err error) error {
	if errors.Is(err, teams_repo.ErrTeamNotFound) {
		return ErrTeamNotFound
	}
	if errors.Is(err, games_repo.ErrGameNotFound) {
		return ErrGameNotFound
	}
	return err
}