// SPDX-FileCopyrightText: 2024 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#include "XdsIntegrateParser.h"

#include <fstream>
#include <sstream>
#include <stdexcept>

IntegrateMap ParseXdsIntegrateHkl(const std::string& filename) {
    std::ifstream in(filename);
    if (!in.is_open()) {
        throw std::runtime_error("Failed to open INTEGRATE.HKL file: " + filename);
    }

    IntegrateMap result;
    std::string line;

    while (std::getline(in, line)) {
        if (line.empty()) continue;
        char c0 = line.front();
        if (c0 == '!' || c0 == '#') continue;

        std::istringstream iss(line);
        int32_t h, k, l;
        double I, sigma;

        if (!(iss >> h >> k >> l >> I >> sigma)) {
            continue;
        }

        HKLData entry;
        entry.h = h;
        entry.k = k;
        entry.l = l;
        entry.I = I;
        entry.sigma = sigma;

        double v = 0.0;
        while (iss >> v) {
            entry.tail.push_back(v);
        }

        result[hkl_key_16(h, k, l)].push_back(std::move(entry));
    }

    return result;
}