#ifndef SIBS_CONF_HPP
#define SIBS_CONF_HPP

#include "Result.hpp"
#include "StringView.hpp"
#include "utils.hpp"
#include "Dependency.hpp"
#include "Package.hpp"
#include <vector>
#include <unordered_map>
#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;
    public:
        virtual ~ConfigCallback(){}
    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);
    };

    enum OptimizationLevel
    {
        OPT_LEV_NONE,
        OPT_LEV_DEBUG,
        OPT_LEV_RELEASE
    };

    const char* asString(OptimizationLevel optLevel);

    class SibsConfig : public ConfigCallback
    {
    public:
        SibsConfig(const std::string &_projectPath, OptimizationLevel _optimizationLevel = OPT_LEV_DEBUG) : projectPath(_projectPath), packageType((PackageType)-1), optimizationLevel(_optimizationLevel), finishedProcessing(false) {}
        virtual ~SibsConfig(){}

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

        virtual PackageType getPackageType() const
        {
            assert(finishedProcessing);
            return packageType;
        }

        virtual const std::string& getTestPath() const
        {
            return testPath;
        }

        virtual const std::vector<Dependency>& getDependencies() const
        {
            return dependencies;
        }

        virtual const std::string& getProjectPath() const
        {
            return projectPath;
        }

        virtual const std::vector<std::string>& getIncludeDirs() const
        {
            return includeDirs;
        }

        virtual OptimizationLevel getOptimizationLevel() const
        {
            return optimizationLevel;
        }
        
        void setPackageType(PackageType packageType)
        {
            this->packageType = packageType;
        }
        
        virtual bool isDefined(const std::string &name) const;
        virtual bool define(const std::string &name, const std::string &value);
        virtual const std::unordered_map<std::string, std::string>& getDefines() const;
    protected:
        virtual void processObject(StringView name) override;
        virtual void processField(StringView name, const ConfigValue &value) override;
        virtual void finished() override;
    protected:
        StringView currentObject;
        std::string projectPath;
        std::string packageName;
        std::string testPath;
        PackageType packageType;
        std::vector<Dependency> dependencies;
        std::vector<std::string> includeDirs;
        std::unordered_map<std::string, std::string> defines;
        OptimizationLevel optimizationLevel;
        bool finishedProcessing;
    };

    class SibsTestConfig : public SibsConfig
    {
    public:
        SibsTestConfig(const std::string &_projectPath) : SibsConfig(_projectPath)
        {
            packageName = "test";
        }

        virtual ~SibsTestConfig(){}

        PackageType getPackageType() const override
        {
            return PackageType::EXECUTABLE;
        }
    protected:
        void processObject(StringView name) override;
        void processField(StringView name, const ConfigValue &value) override;
        void finished() override;
    };
}

#endif //SIBS_CONF_HPP