#pragma once

#include <stdexcept>
#include <string>

#include <valijson/internal/optional.hpp>

namespace valijson {
namespace internal {
namespace json_reference {

/**
  * @brief   Extract URI from JSON Reference relative to the current schema
  *
  * @param   jsonRef  JSON Reference to extract from
  *
  * @return  Optional string containing URI
  */
inline opt::optional<std::string> getJsonReferenceUri(
    const std::string &jsonRef)
{
    const size_t ptrPos = jsonRef.find('#');
    if (ptrPos == 0) {
        // The JSON Reference does not contain a URI, but might contain a
        // JSON Pointer that refers to the current document
        return opt::optional<std::string>();
    } else if (ptrPos != std::string::npos) {
        // The JSON Reference contains a URI and possibly a JSON Pointer
        return jsonRef.substr(0, ptrPos);
    }

    // The entire JSON Reference should be treated as a URI
    return jsonRef;
}

/**
  * @brief   Extract JSON Pointer portion of a JSON Reference
  *
  * @param   jsonRef  JSON Reference to extract from
  *
  * @return  Optional string containing JSON Pointer
  */
inline opt::optional<std::string> getJsonReferencePointer(
    const std::string &jsonRef)
{
    // Attempt to extract JSON Pointer if '#' character is present. Note
    // that a valid pointer would contain at least a leading forward
    // slash character.
    const size_t ptrPos = jsonRef.find('#');
    if (ptrPos != std::string::npos) {
        return jsonRef.substr(ptrPos + 1);
    }

    return opt::optional<std::string>();
}

} // namespace json_reference
} // namespace internal
} // namespace valijson
