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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 <vector>
#include <unordered_map>
#include <cassert>
#include <stdexcept>

namespace sibs
{
    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
    };
    
    enum class CVersion
    {
        C89, // aka ansi
        C99,
        C11
    };
    
    enum class CPPVersion
    {
        CPP11,
        CPP14,
        CPP17
    };

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

    struct SourceFile
    {
        Language language;
        std::string filepath;
    };
    
    const StringView CONFIGS[] = {
        "config.win",
        "config.win.static.debug",
        "config.win.static.release",

        "config.linux",
        "config.linux.static.debug",
        "config.linux.static.release",

        "config.macos",
        "config.macos.static.debug",
        "config.macos.static.release",

        "config.bsd",
        "config.bsd.static.debug",
        "config.bsd.static.release",

        "config.openbsd",
        "config.openbsd.static.debug",
        "config.openbsd.static.release",

        "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",

        "config.macos32",
        "config.macos32.static.debug",
        "config.macos32.static.release"

        "config.macos64",
        "config.macos64.static.debug",
        "config.macos64.static.release",

        "config.openbsd32",
        "config.openbsd32.static.debug",
        "config.openbsd32.static.release",

        "config.openbsd64",
        "config.openbsd64.static.debug",
        "config.openbsd64.static.release"
    };
    const int NUM_CONFIGS = 3 * 13;
    const int CONFIGS_GENERIC_OFFSET = 3 * 5;

    #if OS_TYPE == OS_TYPE_WINDOWS
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_WIN32;
            #define SYSTEM_PLATFORM_NAME  "win32"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 0
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 1
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 2
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_WIN64;
            #define SYSTEM_PLATFORM_NAME  "win64"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 3
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 4
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 5
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION L"lib"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION L"dll"

            #define SYSTEM_GENERIC_PLATFORM_NAME "win"
            #define CONFIG_GENERIC_SYSTEM_PLATFORM 0
            #define CONFIG_GENERIC_STATIC_DEBUG_PLATFORM 1
            #define CONFIG_GENERIC_STATIC_RELEASE_PLATFORM 2
    #elif OS_TYPE == OS_TYPE_LINUX
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_LINUX32;
            #define SYSTEM_PLATFORM_NAME  "linux32"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 6
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 7
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 8
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_LINUX64;
            #define SYSTEM_PLATFORM_NAME  "linux64"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 9
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 10
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 11
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "so"

            #define SYSTEM_GENERIC_PLATFORM_NAME "linux"
            #define CONFIG_GENERIC_SYSTEM_PLATFORM 3
            #define CONFIG_GENERIC_STATIC_DEBUG_PLATFORM 4
            #define CONFIG_GENERIC_STATIC_RELEASE_PLATFORM 5
    #elif OS_TYPE == OS_TYPE_APPLE
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_MACOS32;
            #define SYSTEM_PLATFORM_NAME  "macos32"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 12
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 13
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 14
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_MACOS64;
            #define SYSTEM_PLATFORM_NAME  "macos64"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 15
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 16
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 17
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "dylib"

            #define SYSTEM_GENERIC_PLATFORM_NAME "macos"
            #define CONFIG_GENERIC_SYSTEM_PLATFORM 6
            #define CONFIG_GENERIC_STATIC_DEBUG_PLATFORM 7
            #define CONFIG_GENERIC_STATIC_RELEASE_PLATFORM 8
    #elif OS_TYPE == OS_TYPE_OPENBSD
        #ifdef SIBS_ENV_32BIT
            const Platform SYSTEM_PLATFORM = PLATFORM_OPENBSD32;
            #define SYSTEM_PLATFORM_NAME  "openbsd32"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 18
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 19
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 20
        #else
            const Platform SYSTEM_PLATFORM = PLATFORM_OPENBSD64;
            #define SYSTEM_PLATFORM_NAME  "openbsd64"
            #define CONFIG_SYSTEM_PLATFORM CONFIGS_GENERIC_OFFSET + 21
            #define CONFIG_STATIC_DEBUG_PLATFORM CONFIGS_GENERIC_OFFSET + 22
            #define CONFIG_STATIC_RELEASE_PLATFORM CONFIGS_GENERIC_OFFSET + 23
        #endif
            #define CONFIG_STATIC_LIB_FILE_EXTENSION "a"
            #define CONFIG_DYNAMIC_LIB_FILE_EXTENSION "so"

            // TODO: Also add "bsd" platform
            #define SYSTEM_GENERIC_PLATFORM_NAME "openbsd"
            #define CONFIG_GENERIC_SYSTEM_PLATFORM 9
            #define CONFIG_GENERIC_STATIC_DEBUG_PLATFORM 10
            #define CONFIG_GENERIC_STATIC_RELEASE_PLATFORM 11
    #endif

    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, 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(false),
            showWarnings(false),
            zigTestAllFiles(false),
            packaging(false)
        {
            cmakeDirGlobal = projectPath;
            cmakeDirStatic = cmakeDirGlobal;
            cmakeDirDynamic = cmakeDirGlobal;
            switch(optimizationLevel)
            {
                case OPT_LEV_DEBUG:
                    cmakeArgsGlobal = TINYDIR_STRING("-G Ninja \"-DCMAKE_BUILD_TYPE=Debug\"");
                    break;
                case OPT_LEV_RELEASE:
                    cmakeArgsGlobal = TINYDIR_STRING("-G Ninja \"-DCMAKE_BUILD_TYPE=Release\"");
                    break;
            }
        }
        
        SibsConfig operator=(SibsConfig &other) = delete;
        
        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;
        }
        
        void setTestPath(const FileString &testPath)
        {
            this->testPath = testPath;
        }

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

        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.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 FileString& getCmakeArgs() const
        {
            return cmakeArgsGlobal;
        }
        
        // Get cmake args for static build. This is a combination of args under [cmake] and under [cmake.static]
        FileString getCmakeArgsStatic() const
        {
			FileString result;
            result.reserve(cmakeArgsGlobal.size() + 1 + cmakeArgsStatic.size());
            result += cmakeArgsGlobal;
            result += TINYDIR_STRING(" ");
            result += cmakeArgsStatic;
            return result;
        }
        
        // Get cmake args for dynamic build. This is a combination of args under [cmake] and under [cmake.dynamic]
        FileString getCmakeArgsDynamic() const
        {
			FileString result;
            result.reserve(cmakeArgsGlobal.size() + 1 + cmakeArgsDynamic.size());
            result += cmakeArgsGlobal;
            result += TINYDIR_STRING(" ");
            result += cmakeArgsDynamic;
            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;
        }
        
        bool getSanitize() const
        {
            return sanitize;
        }
        
        void setSanitize(bool 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 zigTestAllFiles;
        bool packaging;
    protected:
        virtual void processObject(StringView name) override;
        virtual void processField(StringView name, const ConfigValue &value) override;
        void parseDependencies(const StringView &name, const ConfigValue &value);
        virtual void finished() override;
        void failInvalidFieldUnderObject(const StringView &fieldName) const;
        void validatePackageTypeDefined() const;
    private:
        void parseCLang(const StringView &fieldName, const ConfigValue &fieldValue);
        void parseCppLang(const StringView &fieldName, const ConfigValue &fieldValue);
        void parsePlatformBuildTypeConfigs(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, 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<GitDependency*> gitDependencies;
        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;
        FileString cmakeArgsGlobal;
		FileString cmakeArgsStatic;
		FileString cmakeArgsDynamic;
        CVersion cVersion;
        CPPVersion cppVersion;
        bool useCmake;
        bool buildTests;
        bool finishedProcessing;
        bool mainProject;
        bool 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