{ lib, stdenvNoCC, buildPackages, fetchurl, xar, cpio, pkgs, python3, pbzx, MacOSX-SDK }:

# TODO: reorganize to make this just frameworks, and move libs to default.nix

let
  stdenv = stdenvNoCC;

  standardFrameworkPath = name: private:
    "/System/Library/${lib.optionalString private "Private"}Frameworks/${name}.framework";

  mkDepsRewrites = deps:
  let
    mergeRewrites = x: y: {
      prefix = lib.mergeAttrs (x.prefix or {}) (y.prefix or {});
      const = lib.mergeAttrs (x.const or {}) (y.const or {});
    };

    rewriteArgs = { prefix ? {}, const ? {} }: lib.concatLists (
      (lib.mapAttrsToList (from: to: [ "-p" "${from}:${to}" ]) prefix) ++
      (lib.mapAttrsToList (from: to: [ "-c" "${from}:${to}" ]) const)
    );

    rewrites = depList: lib.fold mergeRewrites {}
      (map (dep: dep.tbdRewrites)
        (lib.filter (dep: dep ? tbdRewrites) depList));
  in
    lib.escapeShellArgs (rewriteArgs (rewrites (builtins.attrValues deps)));

  mkFramework = { name, deps, private ? false }:
    let self = stdenv.mkDerivation {
      pname = "apple-${lib.optionalString private "private-"}framework-${name}";
      version = MacOSX-SDK.version;

      dontUnpack = true;

      # because we copy files from the system
      preferLocalBuild = true;

      disallowedRequisites = [ MacOSX-SDK ];

      nativeBuildInputs = [ buildPackages.darwin.rewrite-tbd ];

      installPhase = ''
        mkdir -p $out/Library/Frameworks

        cp -r ${MacOSX-SDK}${standardFrameworkPath name private} $out/Library/Frameworks

        if [[ -d ${MacOSX-SDK}/usr/lib/swift/${name}.swiftmodule ]]; then
          mkdir -p $out/lib/swift
          cp -r -t $out/lib/swift \
            ${MacOSX-SDK}/usr/lib/swift/${name}.swiftmodule \
            ${MacOSX-SDK}/usr/lib/swift/libswift${name}.tbd
        fi

        # Fix and check tbd re-export references
        chmod u+w -R $out
        find $out -name '*.tbd' -type f | while read tbd; do
          echo "Fixing re-exports in $tbd"
          rewrite-tbd \
            -p ${standardFrameworkPath name private}/:$out/Library/Frameworks/${name}.framework/ \
            -p /usr/lib/swift/:$out/lib/swift/ \
            ${mkDepsRewrites deps} \
            -r ${builtins.storeDir} \
            "$tbd"
        done
      '';

      propagatedBuildInputs = builtins.attrValues deps;

      passthru = {
        tbdRewrites = {
          prefix."${standardFrameworkPath name private}/" = "${self}/Library/Frameworks/${name}.framework/";
        };
      };

      meta = with lib; {
        description = "Apple SDK framework ${name}";
        maintainers = with maintainers; [ copumpkin ];
        platforms   = platforms.darwin;
      };
    };
  in self;

  framework = name: deps: mkFramework { inherit name deps; private = false; };
  privateFramework = name: deps: mkFramework { inherit name deps; private = true; };
in rec {
  libs = {
    xpc = stdenv.mkDerivation {
      name   = "apple-lib-xpc";
      dontUnpack = true;

      installPhase = ''
        mkdir -p $out/include
        pushd $out/include >/dev/null
        cp -r "${MacOSX-SDK}/usr/include/xpc" $out/include/xpc
        cp "${MacOSX-SDK}/usr/include/launch.h" $out/include/launch.h
        popd >/dev/null
      '';
    };

    Xplugin = stdenv.mkDerivation {
      name   = "apple-lib-Xplugin";
      dontUnpack = true;

      propagatedBuildInputs = with frameworks; [
        OpenGL ApplicationServices Carbon IOKit CoreGraphics CoreServices CoreText
      ];

      installPhase = ''
        mkdir -p $out/include $out/lib
        ln -s "${MacOSX-SDK}/include/Xplugin.h" $out/include/Xplugin.h
        cp ${MacOSX-SDK}/usr/lib/libXplugin.1.tbd $out/lib
        ln -s libXplugin.1.tbd $out/lib/libXplugin.tbd
      '';
    };

    utmp = stdenv.mkDerivation {
      name   = "apple-lib-utmp";
      dontUnpack = true;

      installPhase = ''
        mkdir -p $out/include
        pushd $out/include >/dev/null
        ln -s "${MacOSX-SDK}/include/utmp.h"
        ln -s "${MacOSX-SDK}/include/utmpx.h"
        popd >/dev/null
      '';
    };

    sandbox = stdenv.mkDerivation {
      name = "apple-lib-sandbox";

      dontUnpack = true;
      dontBuild = true;

      installPhase = ''
        mkdir -p $out/include $out/lib
        ln -s "${MacOSX-SDK}/usr/include/sandbox.h" $out/include/sandbox.h
        cp "${MacOSX-SDK}/usr/lib/libsandbox.1.tbd" $out/lib
        ln -s libsandbox.1.tbd $out/lib/libsandbox.tbd
      '';
    };

    libDER = stdenv.mkDerivation {
      name = "apple-lib-libDER";
      dontUnpack = true;
      installPhase = ''
        mkdir -p $out/include
        cp -r ${MacOSX-SDK}/usr/include/libDER $out/include
      '';
    };

    simd = stdenv.mkDerivation {
      name = "apple-lib-simd";
      dontUnpack = true;
      installPhase = ''
        mkdir -p $out/include
        cp -r ${MacOSX-SDK}/usr/include/simd $out/include
      '';
    };
  };

  overrides = super: {
    CoreFoundation = lib.overrideDerivation super.CoreFoundation (drv: {
      setupHook = ./cf-setup-hook.sh;
    });

    # This framework doesn't exist in newer SDKs (somewhere around 10.13), but
    # there are references to it in nixpkgs.
    QuickTime = throw "QuickTime framework not available";

    # Seems to be appropriate given https://developer.apple.com/forums/thread/666686
    JavaVM = super.JavaNativeFoundation;

    CoreVideo = lib.overrideDerivation super.CoreVideo (drv: {
      installPhase = drv.installPhase + ''
        # When used as a module, complains about a missing import for
        # Darwin.C.stdint. Apparently fixed in later SDKs.
        awk -i inplace '/CFBase.h/ { print "#include <stdint.h>" } { print }' \
          $out/Library/Frameworks/CoreVideo.framework/Headers/CVBase.h
      '';
    });
  };

  bareFrameworks = (
    lib.mapAttrs framework (import ./frameworks.nix {
      inherit frameworks libs;
      inherit (pkgs.darwin.apple_sdk_11_0) libnetwork;
      libobjc = pkgs.darwin.apple_sdk_11_0.objc4;
    })
  ) // (
    lib.mapAttrs privateFramework (import ./private-frameworks.nix {
      inherit frameworks;
      libobjc = pkgs.darwin.apple_sdk_11_0.objc4;
    })
  );

  frameworks = bareFrameworks // overrides bareFrameworks;
}