const cloud = require('wx-server-sdk');
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });

const db = cloud.database();

exports.main = async (event) => {
    const wxContext = cloud.getWXContext();
    const openid = wxContext.OPENID;
    const { action } = event;

    switch (action) {
        case 'clearProfile':
            return await handleClearProfile(openid);
        case 'deleteAccount':
            return await handleDeleteAccount(openid);
        default:
            return { code: -1, message: '未知操作' };
    }
};

async function handleClearProfile(openid) {
    const usersCollection = db.collection('users');
    const { data } = await usersCollection.where({ openid }).limit(1).get();

    if (data.length === 0) {
        return { code: -1, message: '用户不存在' };
    }

    await usersCollection.doc(data[0]._id).update({
        data: {
            nickName: null,
            avatarUrl: null,
            lastActiveAt: db.serverDate(),
        },
    });

    return { code: 0, message: '已清除头像和昵称' };
}

async function handleDeleteAccount(openid) {
    const usersCollection = db.collection('users');
    const { data } = await usersCollection.where({ openid }).limit(1).get();

    if (data.length === 0) {
        return { code: -1, message: '用户不存在' };
    }

    await usersCollection.doc(data[0]._id).remove();

    return { code: 0, message: '账户已注销' };
}