feat: auto-create tournament when uploading matches without selection

src/app/admin/matches/upload/page.tsx

@@ -82,7 +82,7 @@ export default function UploadMatchesPage() {
       .catch((err) => console.error("Failed to fetch players:", err))
   }, [])
 
-  const createDefaultTournament = async () => {
+  const createDefaultTournament = async (): Promise<{ id: number; name: string } | null> => {
     try {
       const response = await fetch(`${window.location.origin}/api/tournaments`, {
         method: "POST",
@@ -99,9 +99,12 @@ export default function UploadMatchesPage() {
         setTournaments(newTournaments)
         setSelectedTournament(data.tournament.id.toString())
         setManualTournament(data.tournament.id.toString())
+        return data.tournament
       }
+      return null
     } catch (err) {
       console.error("Failed to create default tournament:", err)
+      return null
     }
   }
 
@@ -128,17 +131,24 @@ export default function UploadMatchesPage() {
       return
     }
 
-    if (!selectedTournament) {
-      setCsvError("Please select a tournament")
-      return
-    }
-
     setIsCsvLoading(true)
 
     try {
+      let tournamentId = selectedTournament
+      
+      // If no tournament is selected, create a default one
+      if (!tournamentId) {
+        const newTournament = await createDefaultTournament()
+        if (newTournament) {
+          tournamentId = newTournament.id.toString()
+        } else {
+          throw new Error("Failed to create default tournament")
+        }
+      }
+
       const formData = new FormData()
       formData.append("csvFile", selectedFile)
-      formData.append("eventId", selectedTournament)
+      formData.append("eventId", tournamentId)
 
       const response = await fetch(`${window.location.origin}/api/matches/upload`, {
         method: "POST",
@@ -207,11 +217,6 @@ export default function UploadMatchesPage() {
     setManualError("")
     setManualSuccess("")
 
-    if (!manualTournament) {
-      setManualError("Please select a tournament")
-      return
-    }
-
     // Validate at least one match has required data
     const validMatches = manualMatches.filter(
       (m) =>
@@ -226,8 +231,20 @@ export default function UploadMatchesPage() {
     setIsManualLoading(true)
 
     try {
+      let tournamentId = manualTournament
+      
+      // If no tournament is selected, create a default one
+      if (!tournamentId) {
+        const newTournament = await createDefaultTournament()
+        if (newTournament) {
+          tournamentId = newTournament.id.toString()
+        } else {
+          throw new Error("Failed to create default tournament")
+        }
+      }
+
       const matchesData = validMatches.map((m) => ({
-        eventId: parseInt(manualTournament),
+        eventId: parseInt(tournamentId),
         round: m.round ? parseInt(m.round) : undefined,
         table: m.table || undefined,
         team1P1Name: m.team1P1,