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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 "Platform.hpp"
#include "Version.hpp"
#include <vector>
#include <unordered_map>
#include <cassert>
#include <stdexcept>

namespace sibs
{
    enum CPU
    {
        CPU_INVALID,
        CPU_BASELINE,
        CPU_NATIVE
    };

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

        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)
        {

        }
        
        ConfigValue(const std::unordered_map<std::string, StringView> &_map) :
            type(Type::OBJECT),
            map(_map)
        {

        }

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

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

        const std::vector<StringView> asList() const
        {
            assert(isList());
            return values;
        }
        
        const std::unordered_map<std::string, StringView>& asObject() const
        {
            assert(isObject());
            return map;
        }
    private:
        Type type;
        std::vector<StringView> values;
        std::unordered_map<std::string, StringView> map;
    };

    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;
    };

    enum OptimizationLevel
    {
        OPT_LEV_NONE,
        OPT_LEV_DEBUG,
        OPT_LEV_RELEASE
    };

    enum class Compiler
    {
        GCC,
        MSVC,
        MINGW_W64
    };
    
    enum class CVersion
    {
        C89, // aka ansi
        C99,
        C11,
        C20
    };
    
    enum class CPPVersion
    {
        CPP03,
        CPP98,
        CPP11,
        CPP14,
        CPP17,
        CPP20
    };

    enum class Language
    {
        NONE,
        C,
        CPP,
        ZIG
    };

    struct SourceFile
    {
        Language language;
        std::string filepath;
    };

    #if OS_TYPE == OS_TYPE_WINDOWS
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_WIN32;
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_WIN64;
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION L"lib"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION L"dll"
    #elif OS_TYPE == OS_TYPE_LINUX
        #ifdef SIBS_ARCH_ARM
            #ifdef SIBS_ENV_32BIT
                const Platform SYSTEM_PLATFORM = PLATFORM_LINUX_ARM32;
            #else
                const Platform SYSTEM_PLATFORM = PLATFORM_LINUX_ARM64;
            #endif
        #elif defined(SIBS_ARCH_X86)
            #ifdef SIBS_ENV_32BIT
                const Platform SYSTEM_PLATFORM = PLATFORM_LINUX_X86_32;
            #else
                const Platform SYSTEM_PLATFORM = PLATFORM_LINUX_X86_64;
            #endif
        #else
            #error "non arm/x86 linux platform"
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #ifdef __CYGWIN__
                #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "dll"
            #else
                #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "so"
            #endif
    #elif OS_TYPE == OS_TYPE_APPLE
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_MACOS32;
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_MACOS64;
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "dylib"
    #elif OS_TYPE == OS_TYPE_OPENBSD
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_OPENBSD32;
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_OPENBSD64;
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "so"
    #elif OS_TYPE == OS_TYPE_HAIKU
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_HAIKU32;
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_HAIKU64;
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "so"
    #endif

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

    enum class Sanitize {
        NONE,
        ADDRESS,
        UNDEFINED,
        LEAK,
        THREAD
    };

    const Sanitize SANITIZE_INVALID = (Sanitize)-1;

    class SibsConfig : public ConfigCallback
    {
    public:
        SibsConfig(Compiler _compiler, const FileString &_projectPath, OptimizationLevel _optimizationLevel, bool _buildTests) : 
            compiler(_compiler), 
            projectPath(_projectPath), 
            packageType((PackageType)-1), 
            optimizationLevel(_optimizationLevel), 
            finishedProcessing(false), 
            useCmake(false),
            buildTests(_buildTests),
            cVersion(CVersion::C11),
            cppVersion(CPPVersion::CPP14),
            mainProject(false),
            sanitize(Sanitize::NONE),
            showWarnings(false),
            errorOnWarning(false),
            enableExceptions(true),
            zigTestAllFiles(false),
            packaging(false),
            bundling(false),
            platform(SYSTEM_PLATFORM),
            use_lto(false),
            include_debug_symbols_in_release(false)
        {
            cmakeDirGlobal = projectPath;
            switch(optimizationLevel)
            {
                case OPT_LEV_DEBUG:
                    cmakeArgsGlobal = { TINYDIR_STRING("-G"), TINYDIR_STRING("Ninja"), TINYDIR_STRING("-DCMAKE_BUILD_TYPE=Debug") };
                    break;
                case OPT_LEV_RELEASE:
                    cmakeArgsGlobal = { TINYDIR_STRING("-G"), TINYDIR_STRING("Ninja"), TINYDIR_STRING("-DCMAKE_BUILD_TYPE=Release") };
                    break;
            }
        }
        
        SibsConfig operator=(SibsConfig &other) = delete;
        
        virtual ~SibsConfig();

        Compiler getCompiler() const
        {
            return compiler;
        }

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

        virtual PackageType getPackageType() const
        {
            return packageType;
        }

        virtual const FileString& getTestPath() const
        {
            return testPath;
        }
        
        void setTestPath(const FileString &testPath)
        {
            this->testPath = testPath;
        }

        virtual const std::vector<PackageListDependency>& getPackageListDependencies() const
        {
            return packageListDependencies;
        }

        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<std::string>& getLibs() const
        {
            return libs;
        }

        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.empty() ? cmakeDirStatic : cmakeDirGlobal;
        }
        
        const FileString& getCmakeDirDynamic() const
        {
            return !cmakeDirDynamic.empty() ? cmakeDirDynamic : cmakeDirGlobal;
        }
        
        // Get cmake args for all builds. This is args under [cmake] only
        const std::vector<FileString>& getCmakeArgs() const
        {
            return cmakeArgsGlobal;
        }
        
        // Get cmake args for static build. This is a combination of args under [cmake] and under [cmake.static]
        std::vector<FileString> getCmakeArgsStatic() const
        {
			std::vector<FileString> result = cmakeArgsGlobal;
            result.insert(result.end(), cmakeArgsStatic.begin(), cmakeArgsStatic.end());
            return result;
        }
        
        // Get cmake args for dynamic build. This is a combination of args under [cmake] and under [cmake.dynamic]
        std::vector<FileString> getCmakeArgsDynamic() const
        {
            std::vector<FileString> result = cmakeArgsGlobal;
            result.insert(result.end(), cmakeArgsDynamic.begin(), cmakeArgsDynamic.end());
            return result;
        }
        
        CVersion getCversion() const
        {
            return cVersion;
        }
        
        CPPVersion getCppVersion() const
        {
            return cppVersion;
        }
        
        bool shouldUseCmake() const
        {
            return useCmake;
        }
        
        bool shouldBuildTests() const
        {
            return buildTests;
        }
        
        void setPackageType(PackageType packageType)
        {
            this->packageType = packageType;
        }
        
        bool isMainProject() const
        {
            return mainProject;
        }
        
        void setMainProject(bool mainProject)
        {
            this->mainProject = mainProject;
        }
        
        Sanitize getSanitize() const
        {
            return sanitize;
        }
        
        void setSanitize(Sanitize sanitize)
        {
            this->sanitize = sanitize;
        }
        
        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;

        virtual bool isTest() const { return false; }
        
        // Get define value by name. 
        // Return empty string if the value is empty or if the defined value doesn't exist
        const std::string& getDefinedValue(const std::string &name) const;
        
        std::vector<FileString> zigTestFiles;
        bool showWarnings;
        bool errorOnWarning;
        bool enableExceptions;
        bool zigTestAllFiles;
        bool packaging;
        bool bundling;
        std::string versionStr;
        PackageVersion version;
        Platform platform;
        CPU cpu = CPU_NATIVE;
        bool use_lto;
        bool include_debug_symbols_in_release;
        std::vector<std::string> includeDirs;
        std::vector<std::string> exposeIncludeDirs;
        std::vector<std::string> ignoreDirs;
        std::vector<std::string> libs;

        CVersion cVersion;
        CPPVersion cppVersion;
        std::string linker;
        bool testsBuildOnly = false;
        bool skipCompile = false;
        std::vector<FileString> testRunArgs;
    protected:
        virtual void processObject(StringView name) override;
        virtual void processField(StringView name, const ConfigValue &value) override;
        void parseConfig(const StringView &name, const ConfigValue &value);
        void parseDependencies(const StringView &name, const ConfigValue &value);
        virtual void finished() override;
        void failInvalidFieldUnderObject(const StringView &fieldName) const;
        void validatePackageTypeDefined() const;
        void parseCLang(const StringView &fieldName, const ConfigValue &fieldValue);
        void parseCppLang(const StringView &fieldName, const ConfigValue &fieldValue);
    private:
        void parsePlatformConfig(const StringView &fieldName, const ConfigValue &fieldValue);
        std::string parsePlatformConfigStatic(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, FileString &cmakeDir, std::vector<FileString> &cmakeArgs);
        void validatePackageName() const;
    protected:
        StringView currentObject;
        Compiler compiler;
        FileString projectPath;
        std::string packageName;
        FileString testPath;
        PackageType packageType;
        std::vector<PackageListDependency> packageListDependencies;
        std::vector<Platform> platforms;
        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::vector<FileString> cmakeArgsGlobal;
		std::vector<FileString> cmakeArgsStatic;
		std::vector<FileString> cmakeArgsDynamic;
        bool useCmake;
        bool buildTests;
        bool finishedProcessing;
        bool mainProject;
        Sanitize sanitize;
    };

    class SibsTestConfig : public SibsConfig
    {
    public:
        SibsTestConfig(Compiler _compiler, const FileString &_projectPath, OptimizationLevel _optimizationLevel) : SibsConfig(_compiler, _projectPath, _optimizationLevel, false)
        {
            packageName = "test";
            showWarnings = true;
        }

        virtual ~SibsTestConfig(){}

        bool isTest() const override { return true; }

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

    class Config
    {
    public:
        static Result<bool> readFromFile(const _tinydir_char_t *filepath, SibsConfig &config);
    };
    
    void readSibsConfig(const FileString &projectPath, const FileString &projectConfFilePath, SibsConfig &sibsConfig, FileString &buildPath);
}

#endif //SIBS_CONF_HPP