#include "../include/GlobalLib.hpp"
#include "../include/FileUtil.hpp"
#include "../backend/ninja/Ninja.hpp"
#include "../include/Conf.hpp"
#include "../include/curl.hpp"
#include "../include/Archive.hpp"
#include "../include/CmakeModule.hpp"
#include "../include/Dependency.hpp"
#include "../include/GitRepository.hpp"

using namespace std;

namespace sibs
{
    Result<bool> GlobalLib::validatePackageExists(const FileString &globalLibRootDir, const std::string &name)
    {
        FileString packageDir = globalLibRootDir + TINYDIR_STRING("/");
#if OS_FAMILY == OS_FAMILY_POSIX
        packageDir += name;
#else
        packageDir += utf8To16(name);
#endif
        FileType packageDirFileType = getFileType(packageDir.c_str());
        switch(packageDirFileType)
        {
            case FileType::FILE_NOT_FOUND:
            {
                string errMsg = "Global lib dependency not found: ";
                errMsg += toUtf8(packageDir);
                return Result<bool>::Err(errMsg, DependencyError::DEPENDENCY_NOT_FOUND);
            }
            case FileType::REGULAR:
            {
                string errMsg = "Corrupt library directory. ";
                errMsg += toUtf8(packageDir);
                errMsg += " is a file, expected it to be a directory";
                return Result<bool>::Err(errMsg);
            }
            case FileType::DIRECTORY:
            {
                return Result<bool>::Ok(true);
            }
            default:
            {
                return Result<bool>::Err("Unexpected error!");
            }
        }
    }

    const _tinydir_char_t *sourceFileExtensions[] = { TINYDIR_STRING("c"),TINYDIR_STRING("cc"), TINYDIR_STRING("cpp"), TINYDIR_STRING("cxx") };
    bool isSourceFile(tinydir_file *file)
    {
        if(!file->is_reg)
            return false;

        for(const _tinydir_char_t *sourceFileExtension : sourceFileExtensions)
        {
            if(_tinydir_strcmp(sourceFileExtension, file->extension) == 0)
                return true;
        }

        return false;
    }

    bool isPathSubPathOf(const _tinydir_char_t *path, const FileString &subPathOf)
    {
        return _tinydir_strncmp(path, subPathOf.c_str(), subPathOf.size()) == 0;
    }
    
    Result<bool> GlobalLib::getLibs(const std::vector<PackageListDependency*> &libs, const SibsConfig &parentConfig, const FileString &globalLibRootDir, LinkerFlagCallbackFunc staticLinkerFlagCallbackFunc, LinkerFlagCallbackFunc dynamicLinkerFlagCallbackFunc, GlobalIncludeDirCallbackFunc globalIncludeDirCallback)
    {
        for(PackageListDependency *globalLibDependency : libs)
        {
            printf("Dependency %s is missing from pkg-config, trying global lib\n", globalLibDependency->name.c_str());
            Result<bool> globalLibLinkerFlagsResult = GlobalLib::getLibsLinkerFlags(parentConfig, globalLibRootDir, globalLibDependency->name, globalLibDependency->version, staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
            if(!globalLibLinkerFlagsResult)
            {
                if(globalLibLinkerFlagsResult.getErrorCode() == GlobalLib::DependencyError::DEPENDENCY_NOT_FOUND || globalLibLinkerFlagsResult.getErrorCode() == GlobalLib::DependencyError::DEPENDENCY_VERSION_NO_MATCH)
                {
                    printf("Dependency not found in global lib, trying to download from github\n");
                    // TODO: Download several dependencies at the same time by adding them to a list
                    // and then iterate them and download them all using several threads.
                    // All dependecies should be downloaded at the same time, this includes dependencies of dependencies.
                    // If a dependency is missing, fail build BEFORE downloading dependencies and before compiling anything.
                    // You do not want to possibly wait several minutes only for build to fail when there is no compilation error.

                    // TODO: If return error is invalid url, then the message should be converted to
                    // invalid package name/version. A check should be done if it is the name or version
                    // that is invalid.
                    Result<bool> downloadDependencyResult = GlobalLib::downloadDependency(globalLibDependency);
                    if(!downloadDependencyResult)
                        return downloadDependencyResult;

                    globalLibLinkerFlagsResult = GlobalLib::getLibsLinkerFlags(parentConfig, globalLibRootDir, globalLibDependency->name, globalLibDependency->version, staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
                    if(!globalLibLinkerFlagsResult)
                        return globalLibLinkerFlagsResult;
                }
                else
                {
                    return globalLibLinkerFlagsResult;
                }
            }
        }
        
        for(GitDependency *gitDependency : parentConfig.getGitDependencies())
        {
            Result<bool> gitLibLinkerFlagsResult = GlobalLib::getLibsLinkerFlags(parentConfig, globalLibRootDir, gitDependency, staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
            if(!gitLibLinkerFlagsResult)
            {
                if(gitLibLinkerFlagsResult.getErrorCode() == GlobalLib::DependencyError::DEPENDENCY_NOT_FOUND)
                {
                    printf("Dependency %s not found in global lib, trying to download from git\n", gitDependency->name.c_str());
                    // TODO: Download several dependencies at the same time by adding them to a list
                    // and then iterate them and download them all using several threads.
                    // All dependecies should be downloaded at the same time, this includes dependencies of dependencies.
                    // If a dependency is missing, fail build BEFORE downloading dependencies and before compiling anything.
                    // You do not want to possibly wait several minutes only for build to fail when there is no compilation error.

                    // TODO: If return error is invalid url, then the message should be converted to
                    // invalid package name/version. A check should be done if it is the name or version
                    // that is invalid.
                    Result<bool> downloadDependencyResult = GlobalLib::downloadDependency(gitDependency);
                    if(!downloadDependencyResult)
                        return downloadDependencyResult;

                    gitLibLinkerFlagsResult = GlobalLib::getLibsLinkerFlags(parentConfig, globalLibRootDir, gitDependency, staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
                    if(!gitLibLinkerFlagsResult)
                        return gitLibLinkerFlagsResult;
                }
                else
                {
                    return gitLibLinkerFlagsResult;
                }
            }
        }
        return Result<bool>::Ok(true);
    }

    Result<bool> GlobalLib::getLibsLinkerFlags(const SibsConfig &parentConfig, const FileString &globalLibRootDir, const std::string &name, const std::string &version, LinkerFlagCallbackFunc staticLinkerFlagCallbackFunc, LinkerFlagCallbackFunc dynamicLinkerFlagCallbackFunc, GlobalIncludeDirCallbackFunc globalIncludeDirCallback)
    {
        Result<bool> packageExistsResult = validatePackageExists(globalLibRootDir, name);
        if (packageExistsResult.isErr())
            return packageExistsResult;

#if OS_FAMILY == OS_FAMILY_POSIX
        FileString namePlatformNative = name;
        FileString versionPlatformNative = version;
#else
        FileString namePlatformNative = utf8To16(name);
        FileString versionPlatformNative = utf8To16(version);
#endif

        FileString packageDir = globalLibRootDir + TINYDIR_STRING("/");
        packageDir += namePlatformNative;

        // TODO: Instead of checking if version is exact match, check if package has same major version
        // and same or newer minor version
        FileString foundVersion;
        walkDir(packageDir.c_str(), [&foundVersion, &versionPlatformNative](tinydir_file *file)
        {
            if(file->is_dir)
            {
                //printf("version: %s\n", file->name);
                if(_tinydir_strcmp(versionPlatformNative.c_str(), file->name) == 0)
                    foundVersion = file->name;
            }
        });

        if(foundVersion.empty())
            return Result<bool>::Err("Global lib dependency found, but version doesn't match dependency version", DependencyError::DEPENDENCY_VERSION_NO_MATCH);

        packageDir += TINYDIR_STRING("/");
        packageDir += versionPlatformNative;

        return GlobalLib::getLibsLinkerFlagsCommon(parentConfig, packageDir, name, staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
    }
    
    Result<bool> GlobalLib::getLibsLinkerFlags(const SibsConfig &parentConfig, const FileString &globalLibRootDir, GitDependency *gitDependency, LinkerFlagCallbackFunc staticLinkerFlagCallbackFunc, LinkerFlagCallbackFunc dynamicLinkerFlagCallbackFunc, GlobalIncludeDirCallbackFunc globalIncludeDirCallback)
    {
        Result<bool> packageExistsResult = validatePackageExists(globalLibRootDir, gitDependency->name);
        if (packageExistsResult.isErr())
            return packageExistsResult;

#if OS_FAMILY == OS_FAMILY_POSIX
        FileString namePlatformNative = gitDependency->name;
        FileString versionPlatformNative = gitDependency->revision;
#else
        FileString namePlatformNative = utf8To16(name);
        FileString versionPlatformNative = utf8To16(version);
#endif

        FileString packageDir = globalLibRootDir + TINYDIR_STRING("/");
        packageDir += namePlatformNative;
        packageDir += TINYDIR_STRING("/");
        packageDir += versionPlatformNative;
        
        // TODO: Check path is valid git repository by using git_repository_open_ext
        
        // TODO: Pull if revision == HEAD, fail build if there are conflicts.
        // TODO: When building a sibs project, put a symlink in libs directory.
        // This allows you to have dependency on a project and make changes to it without pushing
        // to remote before the dependant project can see the changes.
        //GitRepository gitRepo;
        //gitRepo.pull(gitDependency, packageDir);

        return GlobalLib::getLibsLinkerFlagsCommon(parentConfig, packageDir, gitDependency->name, staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
    }
    
    Result<bool> GlobalLib::getLibsLinkerFlagsCommon(const SibsConfig &parentConfig, const FileString &packageDir, const string &dependencyName, LinkerFlagCallbackFunc staticLinkerFlagCallbackFunc, LinkerFlagCallbackFunc dynamicLinkerFlagCallbackFunc, GlobalIncludeDirCallbackFunc globalIncludeDirCallback)
    {
        FileString projectConfFilePath = packageDir;
        projectConfFilePath += TINYDIR_STRING("/project.conf");

        FileType projectConfFileType = getFileType(projectConfFilePath.c_str());
        if(projectConfFileType != FileType::REGULAR)
        {
            string errMsg = "Dependency not found: ";
            errMsg += toUtf8(packageDir);
            return Result<bool>::Err(errMsg, DependencyError::DEPENDENCY_NOT_FOUND);
        }
        
        SibsConfig sibsConfig(parentConfig.getCompiler(), packageDir, parentConfig.getOptimizationLevel(), false);
        Result<bool> result = Config::readFromFile(projectConfFilePath.c_str(), sibsConfig);
        if (result.isErr())
            return result;

        if(sibsConfig.getPackageName().empty())
            return Result<bool>::Err("project.conf is missing required field package.name");

        if(sibsConfig.getPackageType() == PackageType::EXECUTABLE)
        {
            string errMsg = "The dependency ";
            errMsg += dependencyName;
            errMsg += " is an executable. Only libraries can be dependencies";
            return Result<bool>::Err(errMsg);
        }

        if (!containsPlatform(sibsConfig.getPlatforms(), SYSTEM_PLATFORM))
        {
            string errMsg = "The dependency ";
            errMsg += dependencyName;
            errMsg += " does not support your platform (";
            errMsg += asString(SYSTEM_PLATFORM);
            errMsg += ")";
            return Result<bool>::Err(errMsg);
        }
        
        FileString buildPath = packageDir + TINYDIR_STRING("/sibs-build/");
        switch (sibsConfig.getOptimizationLevel())
        {
            case OPT_LEV_DEBUG:
            {
                buildPath += TINYDIR_STRING("debug");
                // TODO: Check if this dependency is static or dynamic and decide which lib path to use from that
                for(const string &staticLib : sibsConfig.getDebugStaticLibs())
                {
                    string staticLibCmd = "\"";
                    staticLibCmd += staticLib;
                    staticLibCmd += "\"";
                    staticLinkerFlagCallbackFunc(staticLibCmd);
                }
                break;
            }
            case OPT_LEV_RELEASE:
            {
                buildPath += TINYDIR_STRING("release");
                // TODO: Check if this dependency is static or dynamic and decide which lib path to use from that
                for (const string &staticLib : sibsConfig.getReleaseStaticLibs())
                {
                    string staticLibCmd = "\"";
                    staticLibCmd += staticLib;
                    staticLibCmd += "\"";
                    staticLinkerFlagCallbackFunc(staticLibCmd);
                }
                break;
            }
        }
        
        if(sibsConfig.shouldUseCmake())
        {
            CmakeModule cmakeModule;
            return cmakeModule.compile(sibsConfig, buildPath, staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
        }
        else
        {
            backend::Ninja ninja;
            // TODO: Use same source file finder as in main.cpp
            FileWalkCallbackFunc collectSourceFiles = [&ninja, &sibsConfig, &collectSourceFiles](tinydir_file *file)
            {
                FileString pathNative = file->path;
    #if OS_FAMILY == OS_FAMILY_WINDOWS
                replaceChar(pathNative, L'/', L'\\');
    #endif
                if(file->is_reg)
                {
                    if (isSourceFile(file))
                    {
                        string fileNameNative = toUtf8(pathNative.c_str() + sibsConfig.getProjectPath().size() + 1);
                        ninja.addSourceFile(fileNameNative.c_str());
                    }
                    else
                    {
                        //printf("Ignoring non-source file: %s\n", file->path + projectPath.size());
                    }
                }
                else
                {
                    // TODO: If compiling without "test" option, do not add test source dir to ninja. Ninja logic will then not build tests...
                    // OR I believe there is no reason to run tests in dependencies. The main projects tests should cover that?
                    // But you might want to know exactly which dependency is causing issue and which part of it...
                    if (!sibsConfig.getTestPath().empty() && isPathSubPathOf(pathNative.c_str(), sibsConfig.getTestPath()))
                    {
                        string filePathUtf8 = toUtf8(pathNative.c_str());
                        ninja.addTestSourceDir(filePathUtf8.c_str());
                    }
                    else if(!directoryToIgnore(pathNative, sibsConfig.getIgnoreDirs()))
                        walkDir(file->path, collectSourceFiles);
                }
            };
            walkDir(packageDir.c_str(), collectSourceFiles);

            if (!ninja.getSourceFiles().empty())
            {
                string libPath = toUtf8(buildPath);
                switch (sibsConfig.getCompiler())
                {
                    case Compiler::GCC:
                    {
                        libPath += "/lib";
                        libPath += dependencyName;
                        if (sibsConfig.getPackageType() == PackageType::STATIC)
                        {
                            libPath += ".a";
                            string libPathCmd = "'";
                            libPathCmd += libPath;
                            libPathCmd += "'";
                            staticLinkerFlagCallbackFunc(libPathCmd);
                        }
                        else
                        {
                            libPath += ".so";
                            string libPathCmd = "'";
                            libPathCmd += libPath;
                            libPathCmd += "'";
                            dynamicLinkerFlagCallbackFunc(libPathCmd);
                        }
                        break;
                    }
                    case Compiler::MSVC:
                    {
                        libPath += "/";
                        libPath += dependencyName;
                        if (sibsConfig.getPackageType() == PackageType::STATIC)
                        {
                            libPath += ".lib";
                            string libPathCmd = "\"";
                            libPathCmd += libPath;
                            libPathCmd += "\"";
                            staticLinkerFlagCallbackFunc(libPathCmd);
                        }
                        else
                        {
                            libPath += ".lib";
                            string libPathCmd = "\"";
                            libPathCmd += libPath;
                            libPathCmd += "\"";
                            dynamicLinkerFlagCallbackFunc(libPathCmd);
                        }
                        break;
                    }
                }
            }

            return ninja.build(sibsConfig, buildPath.c_str(), staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc, globalIncludeDirCallback);
        }
    }

    Result<bool> GlobalLib::downloadDependency(PackageListDependency *dependency)
    {
        Result<string> packageUrlResult = Package::getPackageUrl(dependency->name.c_str(), dependency->version.c_str(), SYSTEM_PLATFORM_NAME);
        if(!packageUrlResult)
            return Result<bool>::Err(packageUrlResult);
        
        const string &url = packageUrlResult.unwrap();

        Result<FileString> libPathResult = getHomeDir();
        if (!libPathResult)
            return Result<bool>::Err(libPathResult);
        FileString libPath = libPathResult.unwrap();
        libPath += TINYDIR_STRING("/.sibs/lib/");
        libPath += toFileString(dependency->name);
        libPath += TINYDIR_STRING("/");
        libPath += toFileString(dependency->version);

        FileString libArchivedFilePath = libPathResult.unwrap();
        libArchivedFilePath += TINYDIR_STRING("/.sibs/archive/");
        libArchivedFilePath += toFileString(dependency->name);
        Result<bool> createArchiveDirResult = createDirectoryRecursive(libArchivedFilePath.c_str());
        if(!createArchiveDirResult)
            return createArchiveDirResult;

        libArchivedFilePath += TINYDIR_STRING("/");
        libArchivedFilePath += toFileString(dependency->version);
        Result<bool> downloadResult = curl::downloadFile(url.c_str(), libArchivedFilePath.c_str());
        if(!downloadResult)
            return downloadResult;

        // Create build path. This is done here because we dont want to create it if download fails
        Result<bool> createLibDirResult = createDirectoryRecursive(libPath.c_str());
        if(!createLibDirResult)
            return createLibDirResult;

        return Archive::extract(libArchivedFilePath.c_str(), libPath.c_str());
    }
    
    Result<bool> GlobalLib::downloadDependency(GitDependency *dependency)
    {
        Result<FileString> libPathResult = getHomeDir();
        if (!libPathResult)
            return Result<bool>::Err(libPathResult);
        FileString libPath = libPathResult.unwrap();
        libPath += TINYDIR_STRING("/.sibs/lib/");
        libPath += toFileString(dependency->name);
        
        // We dont care if the directory already exists. Nothing will happen if it does
        Result<bool> createLibDirResult = createDirectoryRecursive(libPath.c_str());
        if(!createLibDirResult)
            return createLibDirResult;
        
        libPath += TINYDIR_STRING("/");
        libPath += toFileString(dependency->revision);

        GitRepository gitRepo;
        return gitRepo.clone(dependency, libPath);
    }
}