#ifndef SIBS_CONF_HPP
#define SIBS_CONF_HPP

#include "Result.hpp"
#include "StringView.hpp"
#include "utils.hpp"
#include "Dependency.hpp"
#include <vector>
#include <cassert>
#include <stdexcept>

namespace sibs
{
    class ConfigValue
    {
    public:
        enum class Type
        {
            NONE,
            SINGLE,
            LIST
        };

        ConfigValue() : type(Type::NONE) {}

        ConfigValue(StringView value) :
            type(Type::SINGLE)
        {
            values.push_back(value);
        }

        ConfigValue(const std::vector<StringView> &_values) :
            type(Type::LIST),
            values(_values)
        {

        }

        bool isSingle() const { return type == Type::SINGLE; }
        bool isList() const { return type == Type::LIST; }

        StringView asSingle() const
        {
            assert(isSingle());
            return values[0];
        }

        const std::vector<StringView> asList() const
        {
            assert(isList());
            return values;
        }
    private:
        Type type;
        std::vector<StringView> values;
    };

    class Parser;

    class ParserException : public std::runtime_error
    {
    public:
        ParserException(const std::string &errMsg) : runtime_error(errMsg)
        {

        }
    };

    class ConfigCallback
    {
        friend class Parser;
    protected:
        virtual void processObject(StringView name) = 0;
        virtual void processField(StringView name, const ConfigValue &value) = 0;
        virtual void finished() = 0;
    };

    class Config
    {
    public:
        static Result<bool> readFromFile(const char *filepath, const ConfigCallback &callback);
    };

    class SibsConfig : public ConfigCallback
    {
    public:
        SibsConfig() : finishedProcessing(false) {}

        const std::string& getPackageName() const
        {
            assert(finishedProcessing);
            return packageName;
        }

        const std::vector<Dependency>& getDependencies() const
        {
            return dependencies;
        }
    protected:
        void processObject(StringView name) override;
        void processField(StringView name, const ConfigValue &value) override;

        void finished() override
        {
            finishedProcessing = true;
        }
    private:
        StringView currentObject;
        std::string packageName;
        std::vector<Dependency> dependencies;
        bool finishedProcessing;
    };
}

#endif //SIBS_CONF_HPP