#pragma once

#include "ddkit/base/IConfig.hpp"
#include <nlohmann/json.hpp>

#include <stdexcept>
#include <vector>
#include <memory>

namespace ddkit {
namespace base {

class Config : public IConfig {

public:
    // as both ctor-params are strings, make constructor-calls disambiguous:
    struct Text {
        explicit Text(const std::string& text)
            : m_text(text) {}
        std::string m_text;
    };
    struct Filename {
        explicit Filename(const std::string& filename)
            : m_filename(filename) {}
        std::string m_filename;
    };

    class FileNotFound : public std::runtime_error {
        public:
            FileNotFound(const std::string& filename) : std::runtime_error("could not open file \"" + filename + "\""){}
    };

    Config();
    Config(const nlohmann::json&);
    Config(const Text& text); // call: Config config((Config::Text("{ abc = 17 }")));
    Config(const Filename& filename);
    Config(const Config&);
    void operator=(Config const&);

    // IConfig
    bool hasKey(const std::string& key) const override;
    std::string getStringValue(const std::string& key) const override;
    int getIntValue(const std::string& key) const override;
    int64_t getInt64Value(const std::string& key) const override;
    bool getBoolValue(const std::string& key) const override;

    // todo array into IConfig?
    int getArraySize(const std::string& key) const;

    // no template-getter any more (error-prone in conjunction with type-casts)
    // no default-getter any more (error-prone in conjunction with typos)
    // no optional-getter any more (too much tmsif-API-logic, might be useful in other place)

    bool isInt64Value(const std::string& key) const; // int or int64
    bool isBoolValue(const std::string& key) const;
    bool isStringValue(const std::string& key) const;
    bool isArrayValue(const std::string& key) const;
    bool isListValue(const std::string& key) const; // has subKeys

    std::vector<std::string> getSubKeys(const std::string& key) const;

    Config getSubConfig(const std::string& key) const;

    operator std::string() const;

private:

    static nlohmann::json::json_pointer keyToJsonPointer(const std::string& key);
    nlohmann::json getValue(const std::string& key) const;
    bool hasKey(const nlohmann::json&, const std::string& key) const;
    bool hasKey(const nlohmann::json& jsonObj, const nlohmann::json::json_pointer& jsonPtr) const;

    nlohmann::json m_json;
};

} // namespace base
} // namespace ddkit