local buildHooks = require("Core/BuildHooks")
local targetingCmake = false 
local targetingWindows = os.host() == "windows"
local bugHack = targetingCmake or targetingWindows

local kPathPrefix = "!"

local function configureProjectForSolution(prj)
    auFilter(auFilterConfig(Aurora.Settings.sNameOfDebug))
        defines { "DEBUG" }
        if (Aurora.Settings.bIsBuildDirWd) then
            debugdir(Aurora.Settings.sAbsDebug)
        end
        flags "NoIncrementalLink"
    auFilter {}

    auFilter(auFilterConfig({Aurora.Settings.sNameOfInternal, Aurora.Settings.sNameOfShip}))
        defines { "NDEBUG" }
        optimize "Speed"
    auFilter {}

    auFilter(auFilterConfig(Aurora.Settings.sNameOfInternal))
        defines { "STAGING" }
        if (Aurora.Settings.bIsBuildDirWd) then
            debugdir(Aurora.Settings.sAbsStage)
        end
        flags "NoIncrementalLink"
    auFilter {}

    auFilter(auFilterConfig(Aurora.Settings.sNameOfShip))
        defines { "SHIP" }
        if (Aurora.Settings.bIsBuildDirWd) then
            debugdir(Aurora.Settings.sAbsShip)
        end
        if (Aurora.Settings.bIsShipLTOByDefault) then
            flags "LinkTimeOptimization"
        end
    auFilter {}

    local function setTargetDir(id)
        local name = Aurora.Settings["sNameOf" .. id]
        auFilter(auFilterConfig(name))
            defines("AU_CFG_ID_" .. (id:upper()))
            local path = Aurora.Settings.sAbsCompilerWd .. "/Bin/" .. name
            if (Aurora.Settings.bSplitTargetDirByArch) then
                path = path .. "/%{cfg.architecture}"
            end
            targetdir(path)
        auFilter{}
    end

    setTargetDir("Debug")
    setTargetDir("Internal")
    setTargetDir("Ship")

    auFilterForConfigPlatforms(function(config, platformName, arch)
        local platform = Aurora.Platforms[platformName]

        if (Aurora.Settings.bDefinePartialABIInTargetName) then
            targetname(string.format("%s.%s.%s.%s", prj.name, config, platform.outputName, arch))
        end

        if (not(config == Aurora.Settings.sNameOfShip)) then return end

        if (platform.requiresElfStrip and not platform.supportsElfStrip) then
            symbols "Off"
        end
    end)
end

local function setBestDebugDir(dest)
    if (not Aurora.Settings.bIsBuildDirWd) then
        return
    end

    if (not dest or dest:starts(kPathPrefix)) then
        local append = dest and dest:sub(#kPathPrefix + 1)
        if (not append) then append = "" end

        filter(auFilterConfig(Aurora.Settings.sNameOfDebug))
            debugdir(Aurora.Settings.sAbsDebug .. "/" .. append)

        filter(auFilterConfig(Aurora.Settings.sNameOfInternal))
            debugdir(Aurora.Settings.sAbsStage .. "/" .. append)

        filter(auFilterConfig(Aurora.Settings.sNameOfShip))
            debugdir(Aurora.Settings.sAbsShip .. "/" .. append)

        filter {}
    else
        debugdir(auGetRoot() .. dest)
    end
end

local function configureProjectForCompiler()
    if (targetingCmake) then
        filter {"toolset:msc"}
    end 

    if (bugHack) then
		buildoptions {"-utf-8"}
    end
    
    if (targetingCmake) then
        filter {"toolset:msc", "files:**.cpp or files:**.cc or files:**.cxx"}
    elseif (bugHack) then
        filter {"files:**.cpp or files:**.cc or files:**.cxx"}
    end

    if (bugHack) then
        buildoptions {"/experimental:module-", "/Zc:__cplusplus"}
    end

    filter {}
end

local function configureProjectForPlatform(platform, projectType)
    if (platform == "linux") then
        if (Aurora.Settings.bStaticRuntime) then
            buildoptions "-static"
            linkoptions "-l:libc++abi.a"
            linkoptions "-l:libc++.a"
            linkoptions "-Wl,--as-needed"
        end
    end

    if (platform == "win32") then
        characterset(Aurora.Settings.sMsvcDefCharset)

        if (Aurora.Settings.bStaticRuntime) then
            staticruntime("On")
            links "libucrt.lib"
        else
            staticruntime("Off")
        end

        if (not Aurora.Settings.bBasicMitigations) then
            buildoptions {
                 --"/GS-",
                "/sdl-"
            }
            
            flags "NoBufferSecurityCheck"
        end

        if (Aurora.Settings.bHotswap) then
            justmycode("On")
        else
            justmycode("Off")
        end
        
        defines "_CRT_SECURE_NO_WARNINGS"
    else
        if ((projectType == "SharedLib") or
            (projectType == "StaticLib")) then
            pic "On"
        end
    end
end

local function configureProjectForPlatforms(projType)
    auFilterForPlatforms(function(platformName)
        configureProjectForPlatform(platformName, projType)
    end)
end

local function configureProjectErrors()
    if (not Aurora.Settings.bDisableWarningsThatAnnoyRec) then
        return
    end

    filter {"toolset:clang"}
        buildoptions {"-fms-extensions"}

        disablewarnings 
        {
            -- we live life on the edge
            "unused-result",
            
            -- warning: unused unused enumeration
            "unused-value",

            -- :(
            "unknown-warning-option"
        }

    filter{}

    if (targetingCmake) then
        filter {"toolset:msc"}
    end 
        
    if (bugHack) then
        disablewarnings
        {
            "4996", -- The whiny C99 is no longer supported nag
                    -- please needlessly use '_s' and '_'d functions __error__
                    

            "4251", -- MSVC's hurrdurr abis will break if you dynamically link classes
                    -- counter: sod off again. we have full control of the build process, and we only link against 
                    --          dynamic c/stl runtimes. which brainlet thought this was a good idea?
                    --          even microsofts own documentation doesn't state what is guaranteed to be safe.
                    --          dont mix optimizations, mitigation flags, and so on.
                    --          rtti works; the stl doesn't abuse inline/module specific globals; who cares?
        
            "4244" -- conversion from 'double' to 'float', possible loss of data
                    -- this warning is extremely important; however, we're developing a game engine and utilities
                    -- pragma warning push + disable + pop and/or static_casts to hint we expect floating point precision 
                    -- loss is extremely annoying and impractical. further, projects including harfbuzz, freetype,  
                    -- and v8 don't seem to care about this warning either
        }
    end
        
    filter {}
end

local function configureProjectForDebug(prj)
    local debugDir = nil
    
    if (not Aurora.Settings.bIsBuildDirWd) then
        debugdir(Aurora.Settings.sAbsWd)
        return
    end

    if (type(prj.dest) == "string") then
        debugDir = prj.dest
    end
    
    if (type(prj.dest) == "table")  then
        debugDir = prj.dest[1]
    end
    
    setBestDebugDir(debugDir)
end

local function configureProjectForTarget()
    auRequire("Core/Target").startProject()
end

local function configureProjectForLd(prj)
    -- I'm not going to deal with this argument
    -- 
    -- I don't care for the opinions of greybeards who are stuck in the opinions put forth by AT&Ts meme of an OS
    -- In *NIX land, you have +X, use it. I don't want to hear about how operating systems that have more aggressive
    -- executable policies than macos and windows, with their vast ecosystem of file system sandboxing extensions, 
    -- can't cope with loosely following the intentions of the NT loader for the sake of uniformity across platforms.   
    -- 
    -- https://docs.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-search-order#standard-search-order-for-desktop-applications
    --
    -- inb4 LD_LIBRARY_PATH screeching as if users should be expected to mess around with env vars before launching
    -- each application. no, just no.
    -- 
    -- inb4 muh security. A malcious dependency injection would be the product of a hostile manipulation of the accessible
    --  file system files and/or directories. Both are systematic issues we aren't going to make a dent in. The latter being
    --  the fundamental issue your administrators should be focused on mitigating; sandbox all apps that could perform hostile IO.
    -- If an attacker can write a malicious module or system lib proxy somewhere, you've failed basic attack mitigation,
    --  and you're going to be pwned on non-POSIX targets no matter what. 
    -- Elevation exploits shouldn't be a problem so long as the linkoptions order is maintained so that $origin and then 
    --  system libraries are considered before any malcious user-installed libraries could possibly be loaded.
    -- If you're running a broken arse system with missing protected libraries and you run software as write-level groups,
    --  you have bigger issues than my 'lets treat POSIX systems more like NT for cross-compatibility and sanity' assumption.
    -- If you're worried about ld.so running unsigned code, go complain to glib iq-lets who maintain ld.so and force them
    --  into developing actual .text and .rodata signature validation with respect to a global root-writable certificate,
    --  instead of spreading the ball of responsiblity like hot-fucking-potato in a game of respecting the UNIX :tm: way 
    --  of doing things (IE, expecting the user to know how to lockdown vendor supplied packages, RO all LD_LIBRARY_PATHs 
    --  and other undocumented vendor paths, and do god knows what to harden specific softwares dumped without thought
    --  across an arahic FHS/XDG tree, while the developers do jack shit to improve stability, maintainablity, and security).
    --
    -- Change my mind (without parroting what some dude said on some forum over a decade ago)
    -- Don't like it? Disable: Aurora.Settings.bForceWin32EscLd

    if (prj.projectType ~= "SharedLib" and
        prj.projectType ~= "WindowedApp" and
        prj.projectType ~= "ConsoleApp") then
        return
    end

    if (not Aurora.Settings.bForceWin32EscLd) then
        return
    end

    auFilterForConfigPlatforms(function(config, platformName, arch)
        local platform = Aurora.Platforms[platformName]
        if (not platform) then
            return
        end

        if (not platform.elfSupportsRPath) then
            return
        end

        linkoptions { "-Wl,-rpath,'$$ORIGIN'",
                      "-Wl,-rpath,'/lib'" }
        
        if (arch == "x86_64" or arch == "arm") then
            linkoptions { "-Wl,-rpath,'/lib64'" }
        elseif (arch == "x86_32") then
            linkoptions { "-Wl,-rpath,'/lib32'" }
        end

        linkoptions { "-Wl,-rpath,'/usr/lib'" }
        
        if (arch == "x86_64" or arch == "arm") then
            linkoptions { "-Wl,-rpath,'/usr/lib64'" }
        elseif (arch == "x86_32") then
            linkoptions { "-Wl,-rpath,'/usr/lib32'" }
        end

        linkoptions { "-Wl,-rpath,'.'" }

        linkoptions { "-Wl,-rpath,'/usr/local/lib'" }
        
        if (arch == "x86_64" or arch == "arm") then
            linkoptions { "-Wl,-rpath,'/usr/local/lib64'" }
        elseif (arch == "x86_32") then
            linkoptions { "-Wl,-rpath,'/usr/local/lib32'" }
        end

    end)
end

local function processorDispatchRun(processor)

    processor:process()
    -- TODO: m4/protobuf/etc support
end

local function processorTranslateDep(this, dep) 
    if (not this._info.translations) then
        return dep
    end

    local override = this._info.translations[dep]
    if (override) then
        return override
    end

    return dep
end

local function processorGetInfo(this)
    return this._info
end

local function expendBaseProcessor(prj)
    prj.processor._info = prj.info
    prj.processor.dispatch = processorDispatchRun
    prj.processor.translateDep = processorTranslateDep
    prj.processor.getInfo = processorGetInfo
    prj.processor.getMeta = processorGetInfo
end

local function setupProject(prj) 
    print("project", prj.name)

    project(prj.name)
    language("C++") -- C and MASM drivers are still available to files requiring different compilers
    justmycode("Off") -- HACK: default off

    targetname(prj.name) -- TODO (reece): you know what to do
    kind(prj.projectType)

    cppdialect(Aurora.Settings.sCppVersion)
    targetprefix(Aurora.Settings.sLibPrefix)

    objdir(Aurora.Settings.sAbsCompilerWd .. "/" .. prj.name .. "/%{cfg.architecture}")

    configureProjectForSolution(prj)
    configureProjectErrors()
    configureProjectForCompiler()
    configureProjectForPlatforms(prj.projectType)
    configureProjectForTarget()
    configureProjectForDebug(prj)
    configureProjectForLd(prj)

    defines "_AU_HAS_ATOMIC_INTRINS"
    defines("_AU_BUILDING_" .. string.upper(prj.projectType))
    
    if (prj.root) then
        location(prj.root)
    else
        location(os.getcwd())
    end

    defines
    {
        "_ITERATOR_DEBUG_LEVEL=0",
    }

    if (Aurora.Settings.bIncludeAuIncludeIfExists) then
        local commonInclude = auGetRoot() .. "/Include"
        if (os.isdir(commonInclude)) then 
            includedirs(commonInclude)
            files(commonInclude .. "/**.h*")
        end
    end

    -- add includes, if available
    auForEach(prj.inc, function(path)
        print("", "include", _G.path.normalize(path))
        includedirs(path)
        
        files(path .. "/**.h")
        files(path .. "/**.hpp")
        files(path .. "/**.inl")
        files(path .. "/**.inc")
        files(path .. "/**.ipp")
    end)

    -- add sources, if available
    auForEach(prj.src, function(path, root)
        print("", "source", _G.path.normalize(path))
        
        --if (string.sub(path, -2) == ".*") then
        if (string.find(path, "*")) then
            files {path}
            return
        end

        if (os.isfile(path)) then
            files {path}
            return
        end
        
        if (not root) then
            includedirs(path)
        end

        files
        {
            path .. "/**.*pp",
            path .. "/**.inl",
            path .. "/**.inc",
            path .. "/**.c",
            path .. "/**.cc",
            path .. "/**.cxx",
            path .. "/**.h",
            path .. "/**.asm",
            path .. "/**.masm" -- required explicitly
        }
    end, root)

    buildHooks.startProject(prj.name, prj.projectType)

    auForEach(prj.dest, function(v)
        buildHooks.addDest(prj.name, prj.projectType, v)
    end)

    print()
end

local function setupProjectCompat(name, projectType, src, inc, dest, root) 
    local project = 
    {
        name = name,
        projectType = projectType,
        src = src,
        inc = inc,
        dest = dest,
        root = root
    }

    setupProject(project)
end

return 
{
    expendBaseProcessor = expendBaseProcessor,
    setupProjectCompat = setupProjectCompat,
    startProject = setupProject
}