feat: add delete player functionality to admin panel

src/app/api/admin/players/[id]/route.ts

@@ -2,6 +2,89 @@ import { NextResponse } from "next/server";
 import { prisma } from "@/lib/prisma";
 import { hasRole } from "@/lib/permissions";
 
+/**
+ * DELETE /api/admin/players/[id]
+ * 
+ * Delete a player
+ * Requires: club_admin or site_admin role
+ * Note: Player can only be deleted if they have no matches
+ */
+export async function DELETE(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await params;
+    const playerId = parseInt(id);
+
+    // Validate player ID
+    if (isNaN(playerId)) {
+      return NextResponse.json(
+        { error: "Invalid player ID" },
+        { status: 400 }
+      );
+    }
+
+    // Check permissions - only club_admin and site_admin can delete players
+    const permission = await hasRole('club_admin');
+    if (!permission.allowed) {
+      return NextResponse.json(
+        { error: permission.reason || "Not authorized to delete players" },
+        { status: 403 }
+      );
+    }
+
+    // Verify player exists
+    const existingPlayer = await prisma.player.findUnique({
+      where: { id: playerId },
+      include: {
+        matchesAsP1: true,
+        matchesAsP2: true,
+        matchesAsP3: true,
+        matchesAsP4: true,
+      },
+    });
+
+    if (!existingPlayer) {
+      return NextResponse.json(
+        { error: "Player not found" },
+        { status: 404 }
+      );
+    }
+
+    // Check if player has any matches
+    const hasMatches =
+      existingPlayer.matchesAsP1.length > 0 ||
+      existingPlayer.matchesAsP2.length > 0 ||
+      existingPlayer.matchesAsP3.length > 0 ||
+      existingPlayer.matchesAsP4.length > 0;
+
+    if (hasMatches) {
+      return NextResponse.json(
+        { error: "Cannot delete player with match history" },
+        { status: 400 }
+      );
+    }
+
+    // Delete the player (this will also delete associated ratings via cascade)
+    await prisma.player.delete({
+      where: { id: playerId },
+    });
+
+    return NextResponse.json({
+      success: true,
+      message: "Player deleted successfully",
+    });
+  } catch (error: unknown) {
+    console.error("Error deleting player:", error);
+    const message = error instanceof Error ? error.message : "Failed to delete player";
+    return NextResponse.json(
+      { error: message },
+      { status: 500 }
+    );
+  }
+}
+
 /**
  * PATCH /api/admin/players/[id]
  *