feat: complete backend MVP (auth, habits, village, leaderboard)

server/api/auth/login.post.ts

@@ -1,9 +1,6 @@
-import { PrismaClient } from '@prisma/client';
-import { verifyPassword } from '../utils/password';
+import { verifyPassword } from '../../utils/password';
 import { useSession } from 'h3';
 
-const prisma = new PrismaClient();
-
 export default defineEventHandler(async (event) => {
   const body = await readBody(event);
   const { email, password } = body;
@@ -16,19 +13,22 @@ export default defineEventHandler(async (event) => {
     });
   }
 
+  const normalizedEmail = email.toLowerCase();
+
   // 2. Find the user
   const user = await prisma.user.findUnique({
-    where: { email },
+    where: { email: normalizedEmail },
   });
 
   if (!user) {
     throw createError({
-      statusCode: 401, // Unauthorized
+      statusCode: 401,
       statusMessage: 'Invalid credentials',
     });
   }
 
   // 3. Verify the password
+  // WARNING: This verifyPassword is a mock. Replace with a secure library like bcrypt before production.
   const isPasswordValid = await verifyPassword(password, user.password);
   if (!isPasswordValid) {
     throw createError({
@@ -39,7 +39,7 @@ export default defineEventHandler(async (event) => {
 
   // 4. Create and update the session
   const session = await useSession(event, {
-    password: process.env.SESSION_PASSWORD || 'your-super-secret-32-character-password', // Should be in .env
+    password: process.env.SESSION_PASSWORD, // Relies on fail-fast check in auth.ts
     maxAge: 60 * 60 * 24 * 7, // 1 week
   });
 
@@ -50,7 +50,19 @@ export default defineEventHandler(async (event) => {
     }
   });
 
-  // 5. Return user data
-  const { password: _password, ...userWithoutPassword } = user;
-  return { user: userWithoutPassword };
+  // 5. Return user data DTO
+  return {
+    user: {
+        id: user.id,
+        email: user.email,
+        nickname: user.nickname,
+        avatar: user.avatar,
+        coins: user.coins,
+        exp: user.exp,
+        soundOn: user.soundOn,
+        confettiOn: user.confettiOn,
+        createdAt: user.createdAt,
+        updatedAt: user.updatedAt,
+    }
+  };
 });

server/api/auth/logout.post.ts

@@ -2,7 +2,7 @@ import { useSession } from 'h3';
 
 export default defineEventHandler(async (event) => {
   const session = await useSession(event, {
-    password: process.env.SESSION_PASSWORD || 'your-super-secret-32-character-password',
+    password: process.env.SESSION_PASSWORD,
   });
 
   await session.clear();

server/api/auth/me.get.ts

@@ -1,38 +1,38 @@
-import { PrismaClient } from '@prisma/client';
-import { useSession } from 'h3';
-
-const prisma = new PrismaClient();
+import { getUserIdFromSession } from '../../utils/auth';
 
 export default defineEventHandler(async (event) => {
-  // 1. Get the session
-  const session = await useSession(event, {
-    password: process.env.SESSION_PASSWORD || 'your-super-secret-32-character-password',
-  });
+  // 1. Get user ID from session; this helper handles the 401 check.
+  const userId = await getUserIdFromSession(event);
 
-  // 2. Check if user is in session
-  if (!session.data?.user?.id) {
-    throw createError({
-      statusCode: 401,
-      statusMessage: 'Unauthorized',
-    });
-  }
-
-  // 3. Fetch the full user from the database
+  // 2. Fetch the full user from the database
   const user = await prisma.user.findUnique({
-    where: { id: session.data.user.id },
+    where: { id: userId },
   });
 
   if (!user) {
     // This case might happen if the user was deleted but the session still exists.
-    // Clear the invalid session.
+    // The helper can't handle this, so we clear the session here.
+    const session = await useSession(event, { password: process.env.SESSION_PASSWORD });
     await session.clear();
     throw createError({
       statusCode: 401,
-      statusMessage: 'Unauthorized',
+      statusMessage: 'Unauthorized: User not found.',
     });
   }
 
-  // 4. Return user data
-  const { password: _password, ...userWithoutPassword } = user;
-  return { user: userWithoutPassword };
+  // 3. Return user data DTO
+  return {
+    user: {
+        id: user.id,
+        email: user.email,
+        nickname: user.nickname,
+        avatar: user.avatar,
+        coins: user.coins,
+        exp: user.exp,
+        soundOn: user.soundOn,
+        confettiOn: user.confettiOn,
+        createdAt: user.createdAt,
+        updatedAt: user.updatedAt,
+    }
+  };
 });

server/api/auth/register.post.ts

@@ -1,7 +1,4 @@
-import { PrismaClient } from '@prisma/client';
-import { hashPassword } from '../utils/password';
-
-const prisma = new PrismaClient();
+import { hashPassword } from '../../utils/password';
 
 export default defineEventHandler(async (event) => {
   const body = await readBody(event);
@@ -21,10 +18,11 @@ export default defineEventHandler(async (event) => {
     });
   }
 
+  const normalizedEmail = email.toLowerCase(); // Normalize email
 
   // 2. Check if user already exists
   const existingUser = await prisma.user.findUnique({
-    where: { email },
+    where: { email: normalizedEmail },
   });
 
   if (existingUser) {
@@ -35,16 +33,25 @@ export default defineEventHandler(async (event) => {
   }
 
   // 3. Hash password and create user
+  // WARNING: This hashPassword is a mock. Replace with a secure library like bcrypt before production.
   const hashedPassword = await hashPassword(password);
   const user = await prisma.user.create({
     data: {
-      email,
+      email: normalizedEmail,
       password: hashedPassword,
       nickname: nickname || 'New Smurf',
     },
   });
 
-  // 4. Return the new user, excluding the password
-  const { password: _password, ...userWithoutPassword } = user;
-  return { user: userWithoutPassword };
+  // NOTE: Registration does not automatically log in the user.
+  // The user needs to explicitly call the login endpoint after registration.
+
+  // 4. Return the new user, excluding sensitive fields and shortening DTO
+  return {
+    user: {
+      id: user.id,
+      email: user.email,
+      nickname: user.nickname,
+    }
+  };
 });

server/api/habits/[id]/complete.post.ts

@@ -1,4 +1,4 @@
-import { useSession } from 'h3';
+import { getUserIdFromSession } from '../../../utils/auth';
 
 interface CompletionResponse {
   message: string;
@@ -8,20 +8,6 @@ interface CompletionResponse {
   updatedCoins: number;
 }
 
-/**
- * A helper function to safely get the authenticated user's ID from the session.
- */
-async function getUserIdFromSession(event: any): Promise<number> {
-  const session = await useSession(event, {
-    password: process.env.SESSION_PASSWORD,
-  });
-  const userId = session.data?.user?.id;
-  if (!userId) {
-    throw createError({ statusCode: 401, statusMessage: 'Unauthorized' });
-  }
-  return userId;
-}
-
 export default defineEventHandler(async (event): Promise<CompletionResponse> => {
   const userId = await getUserIdFromSession(event);
   const habitId = parseInt(event.context.params?.id || '', 10);

server/api/habits/index.get.ts

@@ -1,4 +1,5 @@
-import { useSession } from 'h3';
+import { getUserIdFromSession } from '../../utils/auth';
+import { Habit } from '@prisma/client';
 
 // DTO to shape the output
 interface HabitCompletionDto {
@@ -12,21 +13,6 @@ interface HabitDto {
   completions: HabitCompletionDto[];
 }
 
-/**
- * A helper function to safely get the authenticated user's ID from the session.
- */
-async function getUserIdFromSession(event: any): Promise<number> {
-  const session = await useSession(event, {
-    password: process.env.SESSION_PASSWORD,
-  });
-
-  const userId = session.data?.user?.id;
-  if (!userId) {
-    throw createError({ statusCode: 401, statusMessage: 'Unauthorized' });
-  }
-  return userId;
-}
-
 export default defineEventHandler(async (event): Promise<HabitDto[]> => {
   const userId = await getUserIdFromSession(event);
 

server/api/habits/index.post.ts

@@ -1,4 +1,4 @@
-import { useSession } from 'h3';
+import { getUserIdFromSession } from '../../utils/auth';
 
 interface HabitDto {
   id: number;
@@ -6,21 +6,6 @@ interface HabitDto {
   daysOfWeek: number[];
 }
 
-/**
- * A helper function to safely get the authenticated user's ID from the session.
- */
-async function getUserIdFromSession(event: any): Promise<number> {
-  const session = await useSession(event, {
-    password: process.env.SESSION_PASSWORD,
-  });
-
-  const userId = session.data?.user?.id;
-  if (!userId) {
-    throw createError({ statusCode: 401, statusMessage: 'Unauthorized' });
-  }
-  return userId;
-}
-
 export default defineEventHandler(async (event): Promise<HabitDto> => {
   const userId = await getUserIdFromSession(event);
   const { name, daysOfWeek } = await readBody(event);

server/api/health.get.ts

@@ -0,0 +1,10 @@
+import prisma from '../utils/prisma'
+
+export default defineEventHandler(async () => {
+  const users = await prisma.user.findMany()
+
+  return {
+    ok: true,
+    usersCount: users.length,
+  }
+})

server/api/leaderboard.get.ts

@@ -0,0 +1,44 @@
+// server/api/leaderboard.get.ts
+
+export default defineEventHandler(async () => {
+  // --- MVP Compromise: Monthly EXP ---
+  // The current schema does not support tracking monthly EXP.
+  // For MVP, we will use the total cumulative `User.exp` as a stand-in
+  // for "current month's EXP". This should be revisited if true monthly
+  // tracking becomes a requirement.
+  const users = await prisma.user.findMany({
+    select: {
+      nickname: true,
+      avatar: true,
+      exp: true,
+    },
+    orderBy: {
+      exp: 'desc',
+    },
+    take: 50, // Limit to top 50 users
+  });
+
+  // --- Rank Calculation ---
+  let currentRank = 0;
+  let previousExp = -1; // Ensure any valid EXP is greater than this
+  
+  // To handle shared ranks, we iterate through the sorted users.
+  // If the current user's EXP is different from the previous user's EXP,
+  // their rank is their position in the 1-based sorted list.
+  // If their EXP is the same, they share the rank of the previous user.
+  const leaderboard = users.map((user, index) => {
+    if (user.exp !== previousExp) {
+      currentRank = index + 1; // Ranks are 1-based
+    }
+    previousExp = user.exp; // Update previous EXP for the next iteration
+
+    return {
+      rank: currentRank,
+      nickname: user.nickname,
+      avatar: user.avatar,
+      exp: user.exp,
+    };
+  });
+
+  return { leaderboard };
+});

server/api/quests/daily-visit.post.ts

@@ -1,4 +1,4 @@
-import { useSession } from 'h3';
+import { getUserIdFromSession } from '../../utils/auth';
 
 interface DailyVisitResponse {
   message: string;
@@ -9,20 +9,6 @@ interface DailyVisitResponse {
   updatedCoins: number;
 }
 
-/**
- * A helper function to safely get the authenticated user's ID from the session.
- */
-async function getUserIdFromSession(event: any): Promise<number> {
-  const session = await useSession(event, {
-    password: process.env.SESSION_PASSWORD,
-  });
-  const userId = session.data?.user?.id;
-  if (!userId) {
-    throw createError({ statusCode: 401, statusMessage: 'Unauthorized' });
-  }
-  return userId;
-}
-
 /**
  * Creates a Date object for the start of a given day in UTC.
  */

server/api/village/harvest.post.ts

@@ -0,0 +1,72 @@
+import { getUserIdFromSession } from '../../utils/auth';
+import { CROP_HARVEST_REWARD, isCropGrown } from '../../utils/village';
+import { CropType } from '@prisma/client';
+
+// --- Handler ---
+export default defineEventHandler(async (event) => {
+    const userId = await getUserIdFromSession(event);
+    const { fieldId } = await readBody(event);
+
+    // 1. --- Validation ---
+    if (typeof fieldId !== 'number') {
+        throw createError({ statusCode: 400, statusMessage: 'Invalid request body. "fieldId" is required.' });
+    }
+    
+    // 2. --- Find the target field and validate its state ---
+    const field = await prisma.villageObject.findFirst({
+        where: {
+            id: fieldId,
+            type: 'FIELD',
+            village: { userId: userId }, // Ensures ownership
+        },
+    });
+
+    if (!field) {
+        throw createError({ statusCode: 404, statusMessage: 'Field not found or you do not own it.' });
+    }
+
+    if (!field.cropType || !field.plantedAt) {
+        throw createError({ statusCode: 400, statusMessage: 'Nothing is planted in this field.' });
+    }
+
+    if (!isCropGrown(field.plantedAt, field.cropType)) {
+        throw createError({ statusCode: 400, statusMessage: 'Crop is not yet fully grown.' });
+    }
+
+    // 3. --- Grant rewards and clear field in a transaction ---
+    const reward = CROP_HARVEST_REWARD[field.cropType];
+
+    const [, , updatedField] = await prisma.$transaction([
+        // Grant EXP and Coins
+        prisma.user.update({
+            where: { id: userId },
+            data: {
+                exp: { increment: reward.exp },
+                coins: { increment: reward.coins },
+            },
+        }),
+        // Clear the crop from the field
+        prisma.villageObject.update({
+            where: { id: fieldId },
+            data: {
+                cropType: null,
+                plantedAt: null,
+            },
+        }),
+        // Re-fetch the field to return its cleared state
+        prisma.villageObject.findUniqueOrThrow({ where: { id: fieldId } }),
+    ]);
+
+    return {
+        message: `${field.cropType} harvested successfully!`,
+        reward: reward,
+        updatedField: {
+            id: updatedField.id,
+            type: updatedField.type,
+            x: updatedField.x,
+            y: updatedField.y,
+            cropType: updatedField.cropType,
+            isGrown: false,
+        }
+    };
+});

server/api/village/index.get.ts

@@ -0,0 +1,50 @@
+import { getUserIdFromSession } from '../../utils/auth';
+import { isCropGrown } from '../../utils/village';
+import { CropType, VillageObjectType } from '@prisma/client';
+
+// --- DTOs ---
+interface VillageObjectDto {
+    id: number;
+    type: VillageObjectType;
+    x: number;
+    y: number;
+    cropType: CropType | null;
+    isGrown: boolean | null;
+}
+
+interface VillageDto {
+    objects: VillageObjectDto[];
+}
+
+// --- Handler ---
+
+export default defineEventHandler(async (event): Promise<VillageDto> => {
+    const userId = await getUserIdFromSession(event);
+
+    let village = await prisma.village.findUnique({
+        where: { userId },
+        include: { objects: true },
+    });
+
+    // If the user has no village yet, create one automatically.
+    if (!village) {
+        village = await prisma.village.create({
+            data: { userId },
+            include: { objects: true },
+        });
+    }
+
+    // Map Prisma objects to clean DTOs, computing `isGrown`.
+    const objectDtos: VillageObjectDto[] = village.objects.map(obj => ({
+        id: obj.id,
+        type: obj.type,
+        x: obj.x,
+        y: obj.y,
+        cropType: obj.cropType,
+        isGrown: obj.type === 'FIELD' ? isCropGrown(obj.plantedAt, obj.cropType) : null,
+    }));
+
+    return {
+        objects: objectDtos,
+    };
+});

server/api/village/objects.post.ts

@@ -0,0 +1,78 @@
+import { getUserIdFromSession } from '../../utils/auth';
+import { VILLAGE_GRID_SIZE, ITEM_COSTS } from '../../utils/village';
+import { VillageObjectType } from '@prisma/client';
+
+// --- Handler ---
+export default defineEventHandler(async (event) => {
+    const userId = await getUserIdFromSession(event);
+    const { type, x, y } = await readBody(event);
+
+    // 1. --- Validation ---
+    if (!type || typeof x !== 'number' || typeof y !== 'number') {
+        throw createError({ statusCode: 400, statusMessage: 'Invalid request body. "type", "x", and "y" are required.' });
+    }
+    if (x < 0 || x >= VILLAGE_GRID_SIZE.width || y < 0 || y >= VILLAGE_GRID_SIZE.height) {
+        throw createError({ statusCode: 400, statusMessage: 'Object placed outside of village bounds.' });
+    }
+    const cost = ITEM_COSTS[type as VillageObjectType];
+    if (cost === undefined) {
+        throw createError({ statusCode: 400, statusMessage: 'Cannot place objects of this type.' });
+    }
+
+    // 2. --- Fetch current state and enforce rules ---
+    const village = await prisma.village.findUnique({
+        where: { userId },
+        include: { objects: true },
+    });
+
+    if (!village) {
+        // This should not happen if GET /village is called first, but as a safeguard:
+        throw createError({ statusCode: 404, statusMessage: 'Village not found.' });
+    }
+
+    // Rule: Cell must be empty
+    if (village.objects.some(obj => obj.x === x && obj.y === y)) {
+        throw createError({ statusCode: 409, statusMessage: 'A building already exists on this cell.' });
+    }
+
+    // Rule: Fields require available workers
+    if (type === 'FIELD') {
+        const houseCount = village.objects.filter(obj => obj.type === 'HOUSE').length;
+        const fieldCount = village.objects.filter(obj => obj.type === 'FIELD').length;
+        if (fieldCount >= houseCount) {
+            throw createError({ statusCode: 400, statusMessage: 'Not enough available workers to build a new field. Build more houses first.' });
+        }
+    }
+
+    // 3. --- Perform atomic transaction ---
+    try {
+        const [, newObject] = await prisma.$transaction([
+            prisma.user.update({
+                where: { id: userId, coins: { gte: cost } },
+                data: { coins: { decrement: cost } },
+            }),
+            prisma.villageObject.create({
+                data: {
+                    villageId: village.id,
+                    type,
+                    x,
+                    y,
+                },
+            }),
+        ]);
+
+        setResponseStatus(event, 201);
+        return {
+            id: newObject.id,
+            type: newObject.type,
+            x: newObject.x,
+            y: newObject.y,
+            cropType: null,
+            isGrown: null,
+        };
+
+    } catch (e) {
+        // Catches failed transactions, likely from the user.update 'where' clause (insufficient funds)
+        throw createError({ statusCode: 402, statusMessage: 'Insufficient coins to build.' });
+    }
+});

server/api/village/objects/[id].delete.ts

@@ -0,0 +1,74 @@
+import { getUserIdFromSession } from '../../../utils/auth';
+import { OBSTACLE_CLEAR_COST } from '../../../utils/village';
+
+export default defineEventHandler(async (event) => {
+    // 1. Get objectId from params
+    const objectId = parseInt(event.context.params?.id || '', 10);
+    if (isNaN(objectId)) {
+        throw createError({ statusCode: 400, statusMessage: 'Invalid object ID.' });
+    }
+
+    const userId = await getUserIdFromSession(event);
+
+    // 2. Find village + objects
+    const village = await prisma.village.findUnique({
+        where: { userId },
+        include: { objects: true }
+    });
+
+    if (!village) {
+        // This case is unlikely if user has ever fetched their village, but is a good safeguard.
+        throw createError({ statusCode: 404, statusMessage: 'Village not found.' });
+    }
+
+    // 3. Find the object
+    const objectToDelete = village.objects.find(o => o.id === objectId);
+
+    // 4. If not found -> 404
+    if (!objectToDelete) {
+        throw createError({ statusCode: 404, statusMessage: 'Object not found.' });
+    }
+
+    // 5. If OBSTACLE
+    if (objectToDelete.type === 'OBSTACLE') {
+        const cost = OBSTACLE_CLEAR_COST[objectToDelete.obstacleMetadata || 'DEFAULT'] ?? OBSTACLE_CLEAR_COST.DEFAULT;
+        
+        try {
+            // Atomically check coins, deduct, and delete
+            await prisma.$transaction([
+                prisma.user.update({
+                    where: { id: userId, coins: { gte: cost } },
+                    data: { coins: { decrement: cost } },
+                }),
+                prisma.villageObject.delete({ where: { id: objectId } }),
+            ]);
+        } catch (e) {
+            // The transaction fails if the user update fails due to insufficient coins
+            throw createError({ statusCode: 402, statusMessage: 'Insufficient coins to clear obstacle.' });
+        }
+
+    // 6. If HOUSE
+    } else if (objectToDelete.type === 'HOUSE') {
+        const houseCount = village.objects.filter(o => o.type === 'HOUSE').length;
+        const fieldCount = village.objects.filter(o => o.type === 'FIELD').length;
+
+        // Check if removing this house violates the worker rule
+        if (fieldCount > (houseCount - 1)) {
+            throw createError({ 
+                statusCode: 400, 
+                statusMessage: `Cannot remove house. You have ${fieldCount} fields and need at least ${fieldCount} workers.` 
+            });
+        }
+        
+        // Delete the house (no cost)
+        await prisma.villageObject.delete({ where: { id: objectId } });
+
+    // 7. Otherwise (FIELD, ROAD, FENCE)
+    } else {
+        // Delete the object (no cost)
+        await prisma.villageObject.delete({ where: { id: objectId } });
+    }
+
+    // 8. Return success message
+    return { message: "Object removed successfully" };
+});

server/api/village/objects/[id].patch.ts

@@ -0,0 +1,73 @@
+import { getUserIdFromSession } from '../../../utils/auth';
+import { VILLAGE_GRID_SIZE, MOVE_COST, isCropGrown } from '../../../utils/village';
+
+// --- Handler ---
+export default defineEventHandler(async (event) => {
+    const userId = await getUserIdFromSession(event);
+    const objectId = parseInt(event.context.params?.id || '', 10);
+    const { x, y } = await readBody(event);
+
+    // 1. --- Validation ---
+    if (isNaN(objectId)) {
+        throw createError({ statusCode: 400, statusMessage: 'Invalid object ID.' });
+    }
+    if (typeof x !== 'number' || typeof y !== 'number') {
+        throw createError({ statusCode: 400, statusMessage: 'Invalid request body. "x" and "y" are required.' });
+    }
+    if (x < 0 || x >= VILLAGE_GRID_SIZE.width || y < 0 || y >= VILLAGE_GRID_SIZE.height) {
+        throw createError({ statusCode: 400, statusMessage: 'Cannot move object outside of village bounds.' });
+    }
+
+    // 2. --- Fetch state and enforce rules ---
+    const village = await prisma.village.findUnique({
+        where: { userId },
+        include: { objects: true },
+    });
+
+    if (!village) {
+        throw createError({ statusCode: 404, statusMessage: 'Village not found.' });
+    }
+
+    const objectToMove = village.objects.find(obj => obj.id === objectId);
+
+    // Rule: Object must exist and belong to the user (implicit via village)
+    if (!objectToMove) {
+        throw createError({ statusCode: 404, statusMessage: 'Object not found.' });
+    }
+
+    // Rule: Cannot move obstacles
+    if (objectToMove.type === 'OBSTACLE') {
+        throw createError({ statusCode: 400, statusMessage: 'Cannot move obstacles. They must be cleared.' });
+    }
+
+    // Rule: Target cell must be empty (and not the same cell)
+    if (village.objects.some(obj => obj.x === x && obj.y === y)) {
+        throw createError({ statusCode: 409, statusMessage: 'Target cell is already occupied.' });
+    }
+
+    // 3. --- Perform atomic transaction ---
+    try {
+        const [, updatedObject] = await prisma.$transaction([
+            prisma.user.update({
+                where: { id: userId, coins: { gte: MOVE_COST } },
+                data: { coins: { decrement: MOVE_COST } },
+            }),
+            prisma.villageObject.update({
+                where: { id: objectId },
+                data: { x, y },
+            }),
+        ]);
+
+        return {
+            id: updatedObject.id,
+            type: updatedObject.type,
+            x: updatedObject.x,
+            y: updatedObject.y,
+            cropType: updatedObject.cropType,
+            isGrown: isCropGrown(updatedObject.plantedAt, updatedObject.cropType),
+        };
+
+    } catch (e) {
+        throw createError({ statusCode: 402, statusMessage: 'Insufficient coins to move object.' });
+    }
+});

server/api/village/plant.post.ts

@@ -0,0 +1,63 @@
+import { getUserIdFromSession } from '../../utils/auth';
+import { PLANTING_COST, isCropGrown } from '../../utils/village';
+import { CropType } from '@prisma/client';
+
+// --- Handler ---
+export default defineEventHandler(async (event) => {
+    const userId = await getUserIdFromSession(event);
+    const { fieldId, cropType } = await readBody(event);
+
+    // 1. --- Validation ---
+    if (typeof fieldId !== 'number' || !cropType) {
+        throw createError({ statusCode: 400, statusMessage: 'Invalid request body. "fieldId" and "cropType" are required.' });
+    }
+    if (!Object.values(CropType).includes(cropType)) {
+        throw createError({ statusCode: 400, statusMessage: 'Invalid crop type.' });
+    }
+
+    // 2. --- Find the target field and validate its state ---
+    const field = await prisma.villageObject.findFirst({
+        where: {
+            id: fieldId,
+            type: 'FIELD',
+            village: { userId: userId }, // Ensures ownership
+        },
+    });
+
+    if (!field) {
+        throw createError({ statusCode: 404, statusMessage: 'Field not found or you do not own it.' });
+    }
+
+    if (field.cropType !== null) {
+        throw createError({ statusCode: 409, statusMessage: 'A crop is already planted in this field.' });
+    }
+
+    // 3. --- Perform atomic transaction ---
+    try {
+        const [, updatedField] = await prisma.$transaction([
+            prisma.user.update({
+                where: { id: userId, coins: { gte: PLANTING_COST } },
+                data: { coins: { decrement: PLANTING_COST } },
+            }),
+            prisma.villageObject.update({
+                where: { id: fieldId },
+                data: {
+                    cropType: cropType,
+                    plantedAt: new Date(),
+                },
+            }),
+        ]);
+
+        return {
+            id: updatedField.id,
+            type: updatedField.type,
+            x: updatedField.x,
+            y: updatedField.y,
+            cropType: updatedField.cropType,
+            isGrown: isCropGrown(updatedField.plantedAt, updatedField.cropType), // will be false
+        };
+
+    } catch (e) {
+        throw createError({ statusCode: 402, statusMessage: 'Insufficient coins to plant seeds.' });
+    }
+});

server/utils/auth.ts

@@ -0,0 +1,22 @@
+// server/utils/auth.ts
+import { useSession } from 'h3';
+
+if (!process.env.SESSION_PASSWORD) {
+  // Fail-fast if the session password is not configured
+  throw new Error('FATAL ERROR: SESSION_PASSWORD environment variable is not set. Session management will not work securely.');
+}
+
+/**
+ * A helper function to safely get the authenticated user's ID from the session.
+ * Throws a 401 Unauthorized error if the user is not authenticated.
+ */
+export async function getUserIdFromSession(event: any): Promise<number> {
+  const session = await useSession(event, {
+    password: process.env.SESSION_PASSWORD, // No fallback here, rely on the fail-fast check
+  });
+  const userId = session.data?.user?.id;
+  if (!userId) {
+    throw createError({ statusCode: 401, statusMessage: 'Unauthorized' });
+  }
+  return userId;
+}

server/utils/prisma.ts

@@ -0,0 +1,5 @@
+import { PrismaClient } from '@prisma/client'
+
+const prisma = new PrismaClient()
+
+export default prisma

server/utils/village.ts

@@ -0,0 +1,52 @@
+// server/utils/village.ts
+import { CropType, VillageObjectType } from '@prisma/client';
+
+// --- Game Economy & Rules ---
+export const VILLAGE_GRID_SIZE = { width: 15, height: 15 };
+
+export const ITEM_COSTS: Partial<Record<VillageObjectType, number>> = {
+  HOUSE: 50,
+  FIELD: 15,
+  ROAD: 5,
+  FENCE: 10,
+};
+
+export const OBSTACLE_CLEAR_COST: Record<string, number> = {
+  ROCK: 20,
+  BUSH: 5,
+  MUSHROOM: 10,
+  DEFAULT: 15, // Fallback cost for untyped obstacles
+};
+
+export const PLANTING_COST = 2; // A small, flat cost for seeds
+export const MOVE_COST = 1; // Cost to move any player-built item
+
+// --- Crop Timings (in milliseconds) ---
+export const CROP_GROWTH_TIME: Record<CropType, number> = {
+  BLUEBERRIES: 60 * 60 * 1000, // 1 hour
+  CORN: 4 * 60 * 60 * 1000,   // 4 hours
+};
+
+// --- Rewards ---
+export const CROP_HARVEST_REWARD: Record<CropType, { exp: number, coins: number }> = {
+  BLUEBERRIES: { exp: 5, coins: 0 },
+  CORN: { exp: 10, coins: 1 },
+};
+
+/**
+ * Checks if a crop is grown based on when it was planted.
+ * @param plantedAt The ISO string or Date object when the crop was planted.
+ * @param cropType The type of crop.
+ * @returns True if the crop has finished growing.
+ */
+export function isCropGrown(plantedAt: Date | null, cropType: CropType | null): boolean {
+  if (!plantedAt || !cropType) {
+    return false;
+  }
+  const growthTime = CROP_GROWTH_TIME[cropType];
+  if (growthTime === undefined) {
+    return false;
+  }
+
+  return (Date.now() - new Date(plantedAt).getTime()) > growthTime;
+}