#include "core/resources/resource_helper.hpp"

#include <fstream>
#include <iostream>
#include <string>

namespace Resource::Helper {

    namespace {

        std::string g_data_root;

    }  // namespace

    void setDataRoot(const std::string& absolute_path) {
        g_data_root = absolute_path;
        if (!g_data_root.empty() && g_data_root.back() != '/') {
            g_data_root += '/';
        }
    }

    auto resolve(const std::string& filepath) -> std::string {
        if (filepath.empty() || filepath.front() == '/') { return filepath; }
        if (g_data_root.empty()) { return filepath; }
        return g_data_root + filepath;
    }

    auto loadFile(const std::string& filepath) -> std::vector<std::uint8_t> {
        const auto FULL = resolve(filepath);
        std::ifstream file(FULL, std::ios::binary | std::ios::ate);
        if (!file) {
            std::cerr << "Resource::Helper: cannot open " << FULL << '\n';
            return {};
        }
        std::streamsize size = file.tellg();
        file.seekg(0, std::ios::beg);
        std::vector<std::uint8_t> data(static_cast<std::size_t>(size));
        if (!file.read(reinterpret_cast<char*>(data.data()), size)) {
            std::cerr << "Resource::Helper: failed to read " << FULL << '\n';
            return {};
        }
        return data;
    }

}  // namespace Resource::Helper