feat: Add photo management features, duplicate detection, attempt limits, and admin deletion

- Add duplicate photo detection (file hash and URL checking)
- Add max attempts per photo with UI counter
- Simplify penalty system (auto-enable when points > 0)
- Prevent scores from going below 0
- Add admin photo deletion functionality
- Improve navigation with always-visible logout
- Prevent users from guessing their own photos

app/api/photos/[photoId]/guess/route.ts

@@ -0,0 +1,144 @@
+import { NextRequest, NextResponse } from "next/server"
+import { auth } from "@/lib/auth"
+import { prisma } from "@/lib/prisma"
+import { normalizeString } from "@/lib/utils"
+
+export async function POST(
+  req: NextRequest,
+  { params }: { params: Promise<{ photoId: string }> }
+) {
+  try {
+    const session = await auth()
+
+    if (!session) {
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+    }
+
+    const { photoId } = await params
+    const { guessText } = await req.json()
+
+    if (!guessText || !guessText.trim()) {
+      return NextResponse.json(
+        { error: "Guess text is required" },
+        { status: 400 }
+      )
+    }
+
+    const photo = await prisma.photo.findUnique({
+      where: { id: photoId },
+    })
+
+    if (!photo) {
+      return NextResponse.json({ error: "Photo not found" }, { status: 404 })
+    }
+
+    // Prevent users from guessing their own photos
+    if (photo.uploaderId === session.user.id) {
+      return NextResponse.json(
+        { error: "You cannot guess on your own photos" },
+        { status: 403 }
+      )
+    }
+
+    // Check if user already has a correct guess
+    const existingCorrectGuess = await prisma.guess.findFirst({
+      where: {
+        userId: session.user.id,
+        photoId: photoId,
+        correct: true,
+      },
+    })
+
+    if (existingCorrectGuess) {
+      return NextResponse.json(
+        { error: "You already guessed this correctly" },
+        { status: 400 }
+      )
+    }
+
+    // Check max attempts limit
+    const photoWithMaxAttempts = photo as typeof photo & { maxAttempts: number | null }
+    if (photoWithMaxAttempts.maxAttempts !== null && photoWithMaxAttempts.maxAttempts > 0) {
+      const userGuessCount = await prisma.guess.count({
+        where: {
+          userId: session.user.id,
+          photoId: photoId,
+        },
+      })
+
+      if (userGuessCount >= photoWithMaxAttempts.maxAttempts) {
+        return NextResponse.json(
+          { error: `You have reached the maximum number of attempts (${photoWithMaxAttempts.maxAttempts}) for this photo` },
+          { status: 400 }
+        )
+      }
+    }
+
+    // Check if guess is correct (case-insensitive, trimmed)
+    const normalizedGuess = normalizeString(guessText)
+    const normalizedAnswer = normalizeString(photo.answerName)
+    const isCorrect = normalizedGuess === normalizedAnswer
+
+    // Create the guess
+    const guess = await prisma.guess.create({
+      data: {
+        userId: session.user.id,
+        photoId: photoId,
+        guessText: guessText.trim(),
+        correct: isCorrect,
+      },
+    })
+
+    // Update user points based on guess result
+    let pointsChange = 0
+    const photoWithPenalty = photo as typeof photo & { penaltyEnabled: boolean; penaltyPoints: number }
+    
+    if (isCorrect) {
+      // Award points for correct answer
+      pointsChange = photo.points
+      await prisma.user.update({
+        where: { id: session.user.id },
+        data: {
+          points: {
+            increment: photo.points, // Award points based on photo difficulty
+          },
+        },
+      })
+    } else if (photoWithPenalty.penaltyEnabled && photoWithPenalty.penaltyPoints > 0) {
+      // Deduct points for wrong answer if penalty is enabled
+      // First, get current user points to prevent going below 0
+      const currentUser = await prisma.user.findUnique({
+        where: { id: session.user.id },
+        select: { points: true },
+      })
+      
+      if (currentUser) {
+        const currentPoints = currentUser.points
+        const penaltyAmount = photoWithPenalty.penaltyPoints
+        const newPoints = Math.max(0, currentPoints - penaltyAmount)
+        const actualDeduction = currentPoints - newPoints
+        
+        pointsChange = -actualDeduction
+        
+        await prisma.user.update({
+          where: { id: session.user.id },
+          data: {
+            points: newPoints,
+          },
+        })
+      }
+    }
+
+    return NextResponse.json({ 
+      guess, 
+      correct: isCorrect,
+      pointsChange 
+    })
+  } catch (error) {
+    console.error("Error submitting guess:", error)
+    return NextResponse.json(
+      { error: "Internal server error" },
+      { status: 500 }
+    )
+  }
+}