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#ifndef SIBS_CONF_HPP
#define SIBS_CONF_HPP

#include "FileUtil.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 _tinydir_char_t *filepath, const ConfigCallback &callback);
    };

    enum OptimizationLevel
    {
        OPT_LEV_NONE,
        OPT_LEV_DEBUG,
        OPT_LEV_RELEASE
    };

    enum class Compiler
    {
        GCC,
        MSVC
    };

    enum Platform
    {
        PLATFORM_ANY,

        PLATFORM_LINUX32,
        PLATFORM_LINUX64,

        PLATFORM_WIN32,
        PLATFORM_WIN64
    };
    
    const StringView CONFIGS[] = {
        "config.win32",
        "config.win32.static.debug",
        "config.win32.static.release",
        
        "config.win64",
        "config.win64.static.debug",
        "config.win64.static.release",
        
        "config.linux32",
        "config.linux32.static.debug",
        "config.linux32.static.release",
        
        "config.linux64",
        "config.linux64.static.debug",
        "config.linux64.static.release"
    };
    const int NUM_CONFIGS = 12;

    // TODO: Detect this at runtime?
    #if OS_TYPE == OS_TYPE_WINDOWS
        #ifdef SIBS_ENV_32BIT
            #define SYSTEM_PLATFORM Platform::PLATFORM_WIN32
            #define CONFIG_SYSTEM_PLATFORM 0
            #define CONFIG_STATIC_DEBUG_PLATFORM 1
            #define CONFIG_STATIC_RELEASE_PLATFORM 2
        #else
            #define SYSTEM_PLATFORM Platform::PLATFORM_WIN64
            #define CONFIG_SYSTEM_PLATFORM 3
            #define CONFIG_STATIC_DEBUG_PLATFORM 4
            #define CONFIG_STATIC_RELEASE_PLATFORM 5
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "lib"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "dll"
    #elif OS_TYPE == OS_TYPE_LINUX
        #ifdef SIBS_ENV_32BIT
            #define SYSTEM_PLATFORM Platform::PLATFORM_LINUX32
            #define CONFIG_SYSTEM_PLATFORM 6
            #define CONFIG_STATIC_DEBUG_PLATFORM 7
            #define CONFIG_STATIC_RELEASE_PLATFORM 8
        #else
            #define SYSTEM_PLATFORM Platform::PLATFORM_LINUX64
            #define CONFIG_SYSTEM_PLATFORM 9
            #define CONFIG_STATIC_DEBUG_PLATFORM 10
            #define CONFIG_STATIC_RELEASE_PLATFORM 11
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "so"
    #endif

    bool containsPlatform(const std::vector<Platform> &platforms, Platform platform);
    const char* asString(Platform platform);
    const char* asString(OptimizationLevel optLevel);
    bool directoryToIgnore(const FileString &dir, const std::vector<std::string> &ignoreDirList);
    bool isProjectNameValid(const std::string &projectName);

    class SibsConfig : public ConfigCallback
    {
    public:
        SibsConfig(Compiler _compiler, const FileString &_projectPath, OptimizationLevel _optimizationLevel = OPT_LEV_DEBUG) : 
            compiler(_compiler), 
            projectPath(_projectPath), 
            packageType((PackageType)-1), 
            optimizationLevel(_optimizationLevel), 
            finishedProcessing(false), 
            useCmake(false)
        {
            cmakeDirGlobal = projectPath;
            cmakeDirStatic = cmakeDirGlobal;
            cmakeDirDynamic = cmakeDirGlobal;
            switch(optimizationLevel)
            {
                case OPT_LEV_DEBUG:
                    cmakeArgsGlobal = "-G Ninja \"-DCMAKE_BUILD_TYPE=Debug\"";
                    break;
                case OPT_LEV_RELEASE:
                    cmakeArgsGlobal = "-G Ninja \"-DCMAKE_BUILD_TYPE=Release\"";
                    break;
            }
        }
        
        virtual ~SibsConfig(){}

        Compiler getCompiler() const
        {
            return compiler;
        }

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

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

        virtual const FileString& getTestPath() const
        {
            return testPath;
        }

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

        virtual const FileString& getProjectPath() const
        {
            return projectPath;
        }

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

        virtual const std::vector<std::string>& getGlobalIncludeDirs() const
        {
            return exposeIncludeDirs;
        }

        virtual const std::vector<Platform>& getPlatforms() const
        {
            return platforms;
        }

        virtual OptimizationLevel getOptimizationLevel() const
        {
            return optimizationLevel;
        }

        const std::vector<std::string>& getDebugStaticLibs() const
        {
            return debugStaticLibs;
        }

        const std::vector<std::string>& getReleaseStaticLibs() const
        {
            return releaseStaticLibs;
        }
        
        const std::vector<std::string>& getIgnoreDirs() const
        {
            return ignoreDirs;
        }
        
        const FileString& getCmakeDir() const
        {
            return cmakeDirGlobal;
        }
        
        const FileString& getCmakeDirStatic() const
        {
            return cmakeDirStatic;
        }
        
        const FileString& getCmakeDirDynamic() const
        {
            return cmakeDirDynamic;
        }
        
        // Get cmake args for all builds. This is args under [cmake] only
        const std::string& getCmakeArgs() const
        {
            return cmakeArgsGlobal;
        }
        
        // Get cmake args for static build. This is a combination of args under [cmake] and under [cmake.static]
        std::string getCmakeArgsStatic() const
        {
            std::string result;
            result.reserve(cmakeArgsGlobal.size() + 1 + cmakeArgsStatic.size());
            result += cmakeArgsGlobal;
            result += " ";
            result += cmakeArgsStatic;
            return result;
        }
        
        // Get cmake args for dynamic build. This is a combination of args under [cmake] and under [cmake.dynamic]
        std::string getCmakeArgsDynamic() const
        {
            std::string result;
            result.reserve(cmakeArgsGlobal.size() + 1 + cmakeArgsDynamic.size());
            result += cmakeArgsGlobal;
            result += " ";
            result += cmakeArgsDynamic;
            return result;
        }
        
        bool shouldUseCmake() const
        {
            return useCmake;
        }
        
        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;
        void failInvalidFieldUnderObject(const StringView &fieldName) const;
    private:
        void parsePlatformConfigs(const StringView &fieldName, const ConfigValue &fieldValue);
        void parsePlatformConfig(const StringView &fieldName, const ConfigValue &fieldValue);
        void parsePlatformConfigStaticDebug(const StringView &fieldName, const ConfigValue &fieldValue);
        void parsePlatformConfigStaticRelease(const StringView &fieldName, const ConfigValue &fieldValue);
        void parseCmake(const StringView &fieldName, const ConfigValue &fieldValue, std::string &cmakeDir, std::string &cmakeArgs);
        void validatePackageName() const;
    protected:
        StringView currentObject;
        Compiler compiler;
        FileString projectPath;
        std::string packageName;
        FileString testPath;
        PackageType packageType;
        std::vector<Dependency> dependencies;
        std::vector<std::string> includeDirs;
        std::vector<std::string> exposeIncludeDirs;
        std::vector<Platform> platforms;
        std::vector<std::string> ignoreDirs;
        std::unordered_map<std::string, std::string> defines;
        OptimizationLevel optimizationLevel;
        std::vector<std::string> debugStaticLibs;
        std::vector<std::string> releaseStaticLibs;
        FileString cmakeDirGlobal;
        FileString cmakeDirStatic;
        FileString cmakeDirDynamic;
        std::string cmakeArgsGlobal;
        std::string cmakeArgsStatic;
        std::string cmakeArgsDynamic;
        bool useCmake;
        bool finishedProcessing;
    };

    class SibsTestConfig : public SibsConfig
    {
    public:
        SibsTestConfig(Compiler _compiler, const FileString &_projectPath, OptimizationLevel _optimizationLevel) : SibsConfig(_compiler, _projectPath, _optimizationLevel)
        {
            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