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,
        }
    };
});