"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var helper_1 = require("../helper");
var partition_1 = require("../util/partition");
var statistics = tslib_1.__importStar(require("../util/statistics"));
function pivot(rows, options) {
    var e_1, _a;
    var _b = helper_1.mergeOptions(options, { op: 'sum' }), field = _b.field, value = _b.value, groupBy = _b.groupBy, op = _b.op;
    if (!(op in statistics)) {
        throw new Error('unknown op');
    }
    var groups = partition_1.partition(rows, groupBy);
    var result = [];
    var _loop_1 = function (group) {
        var row = {};
        (Array.isArray(groupBy) ? groupBy : [groupBy]).forEach(function (item) { return (row[item] = group[0][item]); });
        var fields = group.map(function (item) { return item[field]; });
        fields.forEach(function (target) {
            row[target] = statistics[op](group.filter(function (item) { return item[field] === target; }).map(function (item) { return item[value]; }));
        });
        result.push(row);
    };
    try {
        for (var _c = tslib_1.__values(Object.values(groups)), _d = _c.next(); !_d.done; _d = _c.next()) {
            var group = _d.value;
            _loop_1(group);
        }
    }
    catch (e_1_1) { e_1 = { error: e_1_1 }; }
    finally {
        try {
            if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
        }
        finally { if (e_1) throw e_1.error; }
    }
    return result;
}
exports.pivot = pivot;