/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: Process.hpp
    Date: 2021-6-10
    Author: Reece
***/
#pragma once

#include "Paths.hpp"
#include "ProcessMap.hpp"
#include "IProcessSectionMapView.hpp"
#include "IProcessSectionView.hpp"

namespace Aurora::Process
{
    /**
     * @brief Aborts the current process with the provided exitcode
     * @param exitcode 
     * @return 
    */
    AUKN_SYM AU_NORETURN void Exit(AuUInt32 exitcode);

    AUE_DEFINE(EModulePath, 
    (
        eModulePathCWD,
        eModulePathSystemDir, /// /usr/lib/, windir/system32
        eModulePathUserDir,   /// /usr/local/lib
        eProcessDirectory,    /// 
        //eOSSpecified,       /// LD_LIBRARY_PATH + /etc/ld.so.conf, AddDllDirectory
        eSpecified
    ));


    // eModulePathSystemDir -> why /usr/lib and not /lib?
    // https://www.freedesktop.org/wiki/Software/systemd/TheCaseForTheUsrMerge/
    // Arch 2012: https://archlinux.org/news/the-lib-directory-becomes-a-symlink/
    // Ubuntu 2018 (mandatory 2021+): https://lists.ubuntu.com/archives/ubuntu-devel-announce/2018-November/001253.html https://wiki.debian.org/UsrMerge
    // Fedora (2011?): https://fedoraproject.org/wiki/Features/UsrMove
    
    static AuList<EModulePath> kUserOverloadableSearchPath  = {EModulePath::eSpecified, EModulePath::eModulePathCWD, EModulePath::eProcessDirectory, EModulePath::eModulePathUserDir, EModulePath::eModulePathSystemDir};
    static AuList<EModulePath> kAdminOverloadableSearchPath = {EModulePath::eSpecified, EModulePath::eModulePathSystemDir, EModulePath::eProcessDirectory, EModulePath::eModulePathCWD, EModulePath::eModulePathUserDir};
    static AuList<EModulePath> kSpecifiedPath               = {EModulePath::eSpecified};
    static AuList<EModulePath> kCWDPath                     = {EModulePath::eModulePathCWD};
    static AuList<EModulePath> kProcPath                    = {EModulePath::eProcessDirectory};

    struct ModuleLoadRequest
    {
        inline ModuleLoadRequest(const AuList<AuString> &directories, const AuString &mod) : mod(mod), specifiedSearchPaths(&directories), searchPath(&kSpecifiedPath)
        {}

        inline ModuleLoadRequest(const AuList<AuString> &directories, const AuString &mod, const AuString &version) : mod(mod), version(version), specifiedSearchPaths(&directories), searchPath(&kSpecifiedPath)
        {}
        
        inline ModuleLoadRequest(const AuString &mod) : mod(mod), searchPath(&kAdminOverloadableSearchPath) 
        {}
        
        inline ModuleLoadRequest(const AuString &mod, const AuString &version) : mod(mod), version(version), searchPath(&kAdminOverloadableSearchPath) 
        {}

        AuString mod;
        AuString version;
        AuList<AuString> const * specifiedSearchPaths {};
        AuList<EModulePath> const * searchPath {};
        bool verify {}; // always effectively true if the executable is signed and enableMitigations is true
        bool unixCheckPlusX {};
        bool enableMitigations {true};
    };

    /**
     * @brief Loads a dynamic link module into cache, by the name of 'mod', somewhere in the directories specified by 'searchPath'. 
     *        You should not provide a suffix, platform extension, or the full aurora dll string. Path resolution will take care of
     *        resolving the Aurora ABI, falling back to mod.platformext.
     * @param request 
     * @return 
    */
    AUKN_SYM bool LoadModule(const ModuleLoadRequest &request);


    AUKN_SYM AuMach GetProcAddress(AuString mod, AuString symbol);
}