#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"

using namespace std;

namespace sibs
{
    Result<bool> GlobalLib::validatePackageExists(const string &globalLibRootDir, const string &name)
    {
        string packageDir = globalLibRootDir + "/";
        packageDir += name;
        FileType packageDirFileType = getFileType(packageDir.c_str());
        switch(packageDirFileType)
        {
            case FileType::FILE_NOT_FOUND:
            {
                string errMsg = "Global lib dependency not found: ";
                errMsg += name;
                return Result<bool>::Err(errMsg, DependencyError::DEPENDENCY_NOT_FOUND);
            }
            case FileType::REGULAR:
            {
                string errMsg = "Corrupt library directory. ";
                errMsg += 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 char *sourceFileExtensions[] = { "c", "cc", "cpp", "cxx" };
    bool isSourceFile(tinydir_file *file)
    {
        if(!file->is_reg)
            return false;

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

        return false;
    }

    bool isPathSubPathOf(const char *path, const string &subPathOf)
    {
        return _tinydir_strncmp(path, subPathOf.c_str(), subPathOf.size()) == 0;
    }

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

        string packageDir = globalLibRootDir + "/";
        packageDir += name;

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

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

        packageDir += "/";
        packageDir += version;

        string projectConfFilePath = packageDir;
        projectConfFilePath += "/project.conf";

        FileType projectConfFileType = getFileType(projectConfFilePath.c_str());
        switch(projectConfFileType)
        {
            case FileType::FILE_NOT_FOUND:
            {
                string errMsg = "Global lib dependency found: ";
                errMsg += packageDir;
                errMsg += ", but it's missing a project.conf file";
                return Result<string>::Err(errMsg);
            }
            case FileType::DIRECTORY:
            {
                string errMsg = "Global lib dependency found: ";
                errMsg += packageDir;
                errMsg += ", but it's corrupt (Found directory instead of file)";
                return Result<string>::Err(errMsg);
            }
        }

        SibsConfig sibsConfig(packageDir, parentConfig.getOptimizationLevel());
        Result<bool> result = Config::readFromFile(projectConfFilePath.c_str(), sibsConfig);
        if(result.isErr())
            return Result<string>::Err(result.getErrMsg());

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

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

        backend::Ninja ninja;
        FileWalkCallbackFunc collectSourceFiles = [&ninja, &sibsConfig, &collectSourceFiles](tinydir_file *file)
        {
            if(file->is_reg)
            {
                if (isSourceFile(file))
                {
                    ninja.addSourceFile(file->path + sibsConfig.getProjectPath().size() + 1);
                }
                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(file->path, sibsConfig.getTestPath()))
                    ninja.addTestSourceDir(file->path);
                else
                    walkDir(file->path, collectSourceFiles);
            }
        };
        walkDir(packageDir.c_str(), collectSourceFiles);

        // TODO: Dont do this. Unit tests wont be built. Need to call the below ninja.createBuildFile
        if(ninja.getSourceFiles().empty())
        {
            return Result<string>::Ok("No source files in dependency (header only library?)");
        }
        else
        {
            string buildPath = packageDir + "/sibs-build/";
            switch(sibsConfig.getOptimizationLevel())
            {
                case OPT_LEV_DEBUG:
                    buildPath += "debug";
                    break;
                case OPT_LEV_RELEASE:
                    buildPath += "release";
                    break;
            }

            string libPath = buildPath;
            libPath += "/lib";
            libPath += name;
            if(sibsConfig.getPackageType() == PackageType::STATIC)
            {
                libPath += ".a";
                string libPathCmd = "'";
                libPathCmd += libPath;
                libPathCmd += "'";
                staticLinkerFlagCallbackFunc(libPathCmd);
                libPath += ".a";
            }
            else
            {
                libPath += ".so";
                string libPathCmd = "'";
                libPathCmd += libPath;
                libPathCmd += "'";
                dynamicLinkerFlagCallbackFunc(libPathCmd);
            }

            // TODO: Use different directories depending on the project type, but .o build files should be in the same directory
            // no matter what project type, since they are used for executables, static/dynamic libraries
            Result<bool> createBuildDirResult = createDirectoryRecursive(buildPath.c_str());
            if(createBuildDirResult.isErr())
                return Result<string>::Err(createBuildDirResult);

            Result<bool> buildFileResult = ninja.build(sibsConfig, buildPath.c_str(), staticLinkerFlagCallbackFunc, dynamicLinkerFlagCallbackFunc);
            if (buildFileResult.isErr())
                return Result<string>::Err(buildFileResult.getErrMsg());

            return Result<string>::Ok(libPath);
        }
    }

    Result<bool> GlobalLib::downloadDependency(const Dependency &dependency)
    {
        string url = "https://github.com/DEC05EBA/";
        url += dependency.name;
        url += "/archive/";
        url += dependency.version;
        url += ".tar.gz";

        string libPath = getHomeDir();
        libPath += "/.sibs/lib/";
        libPath += dependency.name;
        libPath += "/";
        libPath += dependency.version;

        string libArchivedFilePath = getHomeDir();
        libArchivedFilePath += "/.sibs/archive/";
        libArchivedFilePath += dependency.name;
        Result<bool> createArchiveDirResult = createDirectoryRecursive(libArchivedFilePath.c_str());
        if(createArchiveDirResult.isErr())
            return createArchiveDirResult;

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

        return Archive::extract(libArchivedFilePath.c_str(), libPath.c_str());
    }
}