import * as tslib_1 from "tslib";
import { forEach } from 'lodash';
import { addUpdateExpression } from './param-util';
export function prepareAndAddUpdateExpressions(metadata, params, updateDefFns) {
    if (updateDefFns && updateDefFns.length) {
        var sortedByActionKeyWord = updateDefFns
            .map(function (updateDefFn) {
            return updateDefFn(params.ExpressionAttributeNames, metadata);
        })
            .reduce(function (result, expr) {
            if (!result[expr.type]) {
                result[expr.type] = [];
            }
            result[expr.type].push(expr);
            return result;
        }, {});
        var actionStatements_1 = [];
        var attributeValues_1 = {};
        var attributeNames_1 = {};
        forEach(sortedByActionKeyWord, function (value, key) {
            var statements = [];
            if (value && value.length) {
                value.forEach(function (updateExpression) {
                    statements.push(updateExpression.statement);
                    attributeValues_1 = tslib_1.__assign({}, attributeValues_1, updateExpression.attributeValues);
                    attributeNames_1 = tslib_1.__assign({}, attributeNames_1, updateExpression.attributeNames);
                });
                actionStatements_1.push(key + " " + statements.join(', '));
            }
        });
        var expression = {
            statement: actionStatements_1.join(' '),
            attributeValues: attributeValues_1,
            attributeNames: attributeNames_1,
        };
        addUpdateExpression(expression, params);
    }
    else {
        throw new Error('at least one update operation must be defined');
    }
}
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