#include "nix/store/store-dir-config.hh"

namespace nix {

void checkName(std::string_view name)
{
    if (name.empty())
        throw BadStorePathName("name must not be empty");
    if (name.size() > StorePath::MaxPathLen)
        throw BadStorePathName("name '%s' must be no longer than %d characters", name, StorePath::MaxPathLen);
    // See nameRegexStr for the definition
    if (name[0] == '.') {
        // check against "." and "..", followed by end or dash
        if (name.size() == 1)
            throw BadStorePathName("name '%s' is not valid", name);
        if (name[1] == '-')
            throw BadStorePathName(
                "name '%s' is not valid: first dash-separated component must not be '%s'", name, ".");
        if (name[1] == '.') {
            if (name.size() == 2)
                throw BadStorePathName("name '%s' is not valid", name);
            if (name[2] == '-')
                throw BadStorePathName(
                    "name '%s' is not valid: first dash-separated component must not be '%s'", name, "..");
        }
    }
    for (auto c : name)
        if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '+' || c == '-'
              || c == '.' || c == '_' || c == '?' || c == '='))
            throw BadStorePathName("name '%s' contains illegal character '%s'", name, c);
}

static void checkPathName(std::string_view path, std::string_view name)
{
    try {
        checkName(name);
    } catch (BadStorePathName & e) {
        throw BadStorePath("path '%s' is not a valid store path: %s", path, Uncolored(e.message()));
    }
}

StorePath::StorePath(std::string_view _baseName)
    : baseName(_baseName)
{
    if (baseName.size() < HashLen + 1)
        throw BadStorePath("'%s' is too short to be a valid store path", baseName);
    for (auto c : hashPart())
        if (c == 'e' || c == 'o' || c == 'u' || c == 't' || !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z')))
            throw BadStorePath("store path '%s' contains illegal base-32 character '%s'", baseName, c);
    checkPathName(baseName, name());
}

StorePath::StorePath(const Hash & hash, std::string_view _name)
    : baseName((hash.to_string(HashFormat::Nix32, false) + "-").append(std::string(_name)))
{
    checkPathName(baseName, name());
}

bool StorePath::isDerivation() const noexcept
{
    return hasSuffix(name(), drvExtension);
}

void StorePath::requireDerivation() const
{
    if (!isDerivation())
        throw FormatError("store path '%s' is not a valid derivation path", to_string());
}

StorePath StorePath::dummy("ffffffffffffffffffffffffffffffff-x");

StorePath StorePath::random(std::string_view name)
{
    return StorePath(Hash::random(HashAlgorithm::SHA1), name);
}

} // namespace nix