#include "game/config/manifest_loader.h"

#include "mars/parse/script.h"

namespace game::config {

int manifest_atoi(std::string_view text) {
    std::size_t i = 0;
    auto is_ws = [](char c) { return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\v' || c == '\f'; };
    while (i < text.size() && is_ws(text[i])) ++i;
    bool neg = false;
    if (i < text.size() && (text[i] == '+' || text[i] == '-')) {
        neg = text[i] == '-';
        ++i;
    }
    std::uint32_t acc = 0;
    for (; i < text.size() && text[i] >= '0' && text[i] <= '9'; ++i)
        acc = acc * 10u + static_cast<std::uint32_t>(text[i] - '0');
    const std::uint32_t v = neg ? (0u - acc) : acc;
    return static_cast<int>(static_cast<std::int32_t>(v));
}

namespace {

std::string_view clip(std::string_view t) {
    return t.size() > kManifestTokenMax ? t.substr(0, kManifestTokenMax) : t;
}

}  // namespace

std::vector<ManifestPair> manifest_pairs(std::string_view text) {
    using mars::parse::ReadStatus;
    using mars::parse::Script;
    std::vector<ManifestPair> out;
    Script s(text);
    int id = 0;  // only ever observed after a successful read (a failed first read ends the loop)
    for (;;) {
        Script::Raw t;
        if (s.read_token(t) == ReadStatus::Ok) id = manifest_atoi(clip(t.text));
        Script::Raw f;
        if (s.read_token(f) != ReadStatus::Ok) break;
        out.push_back(ManifestPair{id, std::string(clip(f.text))});
    }
    return out;
}

std::string weapon_path(std::string_view file) { return "Weapons/" + std::string(file); }

std::string section_manifest_path(std::string_view dir) {
    return std::string(dir) + "/" + kSectionManifestFile;
}

std::string section_path(std::string_view dir, std::string_view file) {
    return std::string(dir) + "/" + std::string(file);
}

}  // namespace game::config