export const checkSchema = (schema, message) => {
    // check first level fields (main_ingest_body)
    // all of them are mandatory
    const messageFirstLevelFields = Object.keys(message)
    const typeMappings = {
        'int': 'number',
        'string': 'string',
        'boolean': 'boolean',
        'object': 'object'
    }

    for (let field of Object.keys(schema.main_ingest_body)) {
        if (field === 'required') {
            continue
        }

        if (field === 'ip') {
            // pending to discuss where the IP is ingested, in the SDK
            // or the server
            continue
        }

        const requiredFields = new Set(schema.main_ingest_body.required)

        if (message[field] === undefined && requiredFields.has(field)) {
            throw new Error('schema-validation-missing-field')
        }

        if (typeof (message[field]) !== typeMappings[schema.main_ingest_body[field].type]) {
            throw new Error('schema-validation-type-missmatch')
        }

        if (schema.main_ingest_body[field].enum !== undefined) {
            if (!schema.main_ingest_body[field].enum.includes(message[field])) {
                throw new Error('schema-validation-invalid-value')
            }
        }
    }

    for (let field of Object.keys(message)) {
        if (schema.main_ingest_body[field] === undefined) {
            throw new Error('schema-validation-extra-field')
        }

    }

}