const cloud = require('wx-server-sdk');

cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });

function validatePayload(event) {
    const id = String(event.id || '').trim();
    const name = String(event.name || '').trim();
    const icon = String(event.icon || '').trim();
    const color = String(event.color || '').trim();
    const sortOrder = Number(event.sortOrder || 0);
    const parentId =
        event.parentId === undefined || event.parentId === null
            ? null
            : String(event.parentId).trim();

    if (!id) throw new Error('分类 id 不能为空');
    if (!name) throw new Error('分类名称不能为空');
    if (!icon) throw new Error('分类图标不能为空');
    if (!color) throw new Error('分类颜色不能为空');
    if (!Number.isFinite(sortOrder)) throw new Error('分类排序不合法');

    return {
        id,
        name,
        icon,
        color,
        sortOrder,
        parentId,
    };
}

exports.main = async (event) => {
    try {
        const payload = validatePayload(event);
        const db = cloud.database();
        const collection = db.collection('categories');

        try {
            await collection.doc(payload.id).get();
        } catch (error) {
            return {
                success: false,
                message: '分类不存在，无法更新',
            };
        }

        await collection.doc(payload.id).update({
            data: {
                name: payload.name,
                icon: payload.icon,
                color: payload.color,
                sortOrder: payload.sortOrder,
                parentId: payload.parentId,
            },
        });

        return {
            success: true,
            data: {
                _id: payload.id,
                name: payload.name,
                icon: payload.icon,
                color: payload.color,
                sortOrder: payload.sortOrder,
                parentId: payload.parentId,
            },
        };
    } catch (error) {
        return {
            success: false,
            message: error instanceof Error ? error.message : '更新分类失败',
        };
    }
};