ADD: added initial page with login

backend/internal/tournament/handler.go

@@ -0,0 +1,89 @@
+package tournament
+
+import (
+	"net/http"
+	"volleyball/internal/common"
+
+	"github.com/gin-gonic/gin"
+)
+
+var tournaments = []Tournament{
+	{
+		ID:              "1",
+		Name:            "Beach Cup",
+		Location:        "Berlin",
+		MaxParticipants: 8,
+		Teams: []Team{
+			{ID: "t1", Name: "Smasher"},
+			{ID: "t2", Name: "Blockbuster"},
+		},
+		OrganizerId: "system-user-id",
+	},
+	{
+		ID:              "2",
+		Name:            "City Open",
+		Location:        "Hamburg",
+		MaxParticipants: 10,
+		Teams:           []Team{},
+		OrganizerId:     "other-user",
+	},
+}
+
+func ListTournaments(c *gin.Context) {
+	c.JSON(http.StatusOK, tournaments)
+}
+
+func GetTournament(c *gin.Context) {
+	id := c.Param("id")
+	for _, t := range tournaments {
+		if t.ID == id {
+			c.JSON(http.StatusOK, t)
+			return
+		}
+	}
+	common.RespondError(c, http.StatusNotFound, "Tournament not found")
+}
+
+func JoinTournament(c *gin.Context) {
+	id := c.Param("id")
+	var team Team
+	if err := c.ShouldBindJSON(&team); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid team data"})
+		return
+	}
+
+	for i, t := range tournaments {
+		if t.ID == id {
+			tournaments[i].Teams = append(tournaments[i].Teams, team)
+			c.JSON(http.StatusOK, tournaments[i])
+			return
+		}
+	}
+	c.JSON(http.StatusNotFound, gin.H{"error": "Tournament not found"})
+}
+
+func UpdateTournament(c *gin.Context) {
+	id := c.Param("id")
+	userId := c.GetString("userId")
+
+	var updated Tournament
+	if err := c.ShouldBindJSON(&updated); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid data"})
+		return
+	}
+
+	for i, t := range tournaments {
+		if t.ID == id {
+			if t.OrganizerId != userId {
+				c.JSON(http.StatusForbidden, gin.H{"error": "No permission"})
+				return
+			}
+			tournaments[i].Name = updated.Name
+			tournaments[i].Location = updated.Location
+			tournaments[i].MaxParticipants = updated.MaxParticipants
+			c.JSON(http.StatusOK, tournaments[i])
+			return
+		}
+	}
+	c.JSON(http.StatusNotFound, gin.H{"error": "Tournament not found"})
+}