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package game
import (
"context"
"log/slog"
"os"
"regexp"
"strings"
"albatross-2026-backend/db"
"albatross-2026-backend/taskqueue"
)
type TaskQueueInterface interface {
EnqueueTaskRunTestcase(gameID, userID, submissionID, testcaseID int, language, code, stdin, stdout string) error
}
type TaskWorkerInterface interface {
Run() error
Results() chan taskqueue.TaskResult
}
var whitespaceRe = regexp.MustCompile(`\s+`)
type Hub struct {
q db.Querier
txm db.TxManager
ctx context.Context
taskQueue TaskQueueInterface
taskWorker TaskWorkerInterface
}
func NewGameHub(q db.Querier, txm db.TxManager, taskQueue TaskQueueInterface, taskWorker TaskWorkerInterface) *Hub {
return &Hub{
q: q,
txm: txm,
ctx: context.Background(),
taskQueue: taskQueue,
taskWorker: taskWorker,
}
}
func (hub *Hub) Run() {
go func() {
if err := hub.taskWorker.Run(); err != nil {
slog.Error("task worker failed", "error", err)
os.Exit(1)
}
}()
go hub.processTaskResults()
}
func (hub *Hub) CalcCodeSize(code string, language string) int {
trimmed := whitespaceRe.ReplaceAllString(code, "")
if language == "php" {
return len(strings.TrimSuffix(strings.TrimPrefix(strings.TrimPrefix(trimmed, "<?php"), "<?"), "?>"))
}
return len(trimmed)
}
func (hub *Hub) EnqueueTestTasks(ctx context.Context, submissionID, gameID, userID int, language, code string) error {
rows, err := hub.q.ListTestcasesByGameID(ctx, int32(gameID))
if err != nil {
return err
}
for _, row := range rows {
err := hub.taskQueue.EnqueueTaskRunTestcase(
gameID,
userID,
submissionID,
int(row.TestcaseID),
language,
normalizeCRLF(code),
normalizeCRLF(row.Stdin),
row.Stdout,
)
if err != nil {
return err
}
}
return nil
}
func (hub *Hub) processTaskResults() {
for taskResult := range hub.taskWorker.Results() {
switch taskResult := taskResult.(type) {
case *taskqueue.TaskResultRunTestcase:
if err := hub.processTaskResultRunTestcase(taskResult); err != nil {
slog.Error("failed to process testcase result", "error", err, "submissionID", taskResult.TaskPayload.SubmissionID)
continue
}
aggregatedStatus, err := hub.q.AggregateTestcaseResults(hub.ctx, int32(taskResult.TaskPayload.SubmissionID))
if err != nil {
slog.Error("failed to aggregate testcase results", "error", err, "submissionID", taskResult.TaskPayload.SubmissionID)
continue
}
if aggregatedStatus == "running" {
continue
}
if err := hub.updateSubmissionAndGameState(taskResult, aggregatedStatus); err != nil {
slog.Error("failed to update submission and game state", "error", err, "submissionID", taskResult.TaskPayload.SubmissionID)
continue
}
default:
slog.Error("unexpected task result type", "type", taskResult.Type())
continue
}
}
}
func (hub *Hub) updateSubmissionAndGameState(taskResult *taskqueue.TaskResultRunTestcase, aggregatedStatus string) error {
return hub.txm.RunInTx(hub.ctx, func(qtx db.Querier) error {
if err := qtx.UpdateSubmissionStatus(hub.ctx, db.UpdateSubmissionStatusParams{
SubmissionID: int32(taskResult.TaskPayload.SubmissionID),
Status: aggregatedStatus,
}); err != nil {
return err
}
if err := qtx.UpdateGameStateStatus(hub.ctx, db.UpdateGameStateStatusParams{
GameID: int32(taskResult.TaskPayload.GameID),
UserID: int32(taskResult.TaskPayload.UserID),
Status: aggregatedStatus,
}); err != nil {
return err
}
if aggregatedStatus == "success" {
if err := qtx.SyncGameStateBestScoreSubmission(hub.ctx, db.SyncGameStateBestScoreSubmissionParams{
GameID: int32(taskResult.TaskPayload.GameID),
UserID: int32(taskResult.TaskPayload.UserID),
}); err != nil {
return err
}
}
return nil
})
}
func (hub *Hub) processTaskResultRunTestcase(
taskResult *taskqueue.TaskResultRunTestcase,
) error {
if taskResult.Err != nil {
return taskResult.Err
}
if taskResult.Status != "success" {
if err := hub.q.CreateTestcaseResult(hub.ctx, db.CreateTestcaseResultParams{
SubmissionID: int32(taskResult.TaskPayload.SubmissionID),
TestcaseID: int32(taskResult.TaskPayload.TestcaseID),
Status: taskResult.Status,
Stdout: taskResult.Stdout,
Stderr: taskResult.Stderr,
}); err != nil {
return err
}
return nil
}
var status string
if isTestcaseResultCorrect(taskResult.TaskPayload.Stdout, taskResult.Stdout) {
status = "success"
} else {
status = "wrong_answer"
}
if err := hub.q.CreateTestcaseResult(hub.ctx, db.CreateTestcaseResultParams{
SubmissionID: int32(taskResult.TaskPayload.SubmissionID),
TestcaseID: int32(taskResult.TaskPayload.TestcaseID),
Status: status,
Stdout: taskResult.Stdout,
Stderr: taskResult.Stderr,
}); err != nil {
return err
}
return nil
}
func normalizeCRLF(s string) string {
return strings.ReplaceAll(strings.ReplaceAll(s, "\r\n", "\n"), "\r", "\n")
}
func normalizeTestcaseResultOutput(s string) string {
return normalizeCRLF(strings.TrimSpace(s))
}
func isTestcaseResultCorrect(expectedStdout, actualStdout string) bool {
expectedStdout = normalizeTestcaseResultOutput(expectedStdout)
actualStdout = normalizeTestcaseResultOutput(actualStdout)
return actualStdout == expectedStdout
}
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