package rosa

import (
	"regexp"
	"strings"

	"hakurei.app/internal/pkg"
)

func (t Toolchain) newLLVM() (pkg.Artifact, string) {
	const (
		version  = "22.1.4"
		checksum = "Bk3t-tV5sD5T0bqefFMcLeFuAwXnhFipywZmqst5hAZs97QQWGKB_5XyAFjj5tDB"
	)

	cache := []KV{
		{"CMAKE_BUILD_TYPE", "Release"},

		{"ENABLE_LINKER_BUILD_ID", "ON"},
		{"COMPILER_RT_USE_BUILTINS_LIBRARY", "ON"},
		{"COMPILER_RT_DEFAULT_TARGET_ONLY", "ON"},
		{"COMPILER_RT_BUILD_GWP_ASAN", "OFF"},
		{"LIBCXX_CXX_ABI", "libcxxabi"},
		{"LIBCXX_USE_COMPILER_RT", "ON"},
		{"LIBCXX_ENABLE_STATIC_ABI_LIBRARY", "OFF"},
		{"LIBCXX_HAS_MUSL_LIBC", "ON"},
		{"LIBCXX_HARDENING_MODE", "fast"},
		{"LIBCXXABI_USE_LLVM_UNWINDER", "ON"},
		{"LIBCXXABI_ENABLE_STATIC_UNWINDER", "OFF"},
		{"LIBCXXABI_USE_COMPILER_RT", "ON"},
		{"LLVM_INSTALL_BINUTILS_SYMLINKS", "ON"},
		{"LLVM_INSTALL_UTILS", "ON"},
		{"LLVM_BUILD_LLVM_DYLIB", "ON"},
		{"LLVM_LINK_LLVM_DYLIB", "ON"},
		{"LLVM_APPEND_VC_REV", "OFF"},
		{"LLVM_ENABLE_RTTI", "ON"},
		{"LLVM_ENABLE_ZLIB", "FORCE_ON"},
		{"LLVM_ENABLE_ZSTD", "FORCE_ON"},
		{"LLVM_ENABLE_PER_TARGET_RUNTIME_DIR", "ON"},
		{"CLANG_DEFAULT_RTLIB", "compiler-rt"},
		{"CLANG_DEFAULT_UNWINDLIB", "libunwind"},
		{"CLANG_DEFAULT_CXX_STDLIB", "libc++"},
		{"CLANG_CONFIG_FILE_SYSTEM_DIR", "/system/etc/clang"},
		{"LLVM_ENABLE_FFI", "OFF"},
		{"LLVM_ENABLE_LIBXML2", "OFF"},
		{"LLVM_ENABLE_LIBCXX", "ON"},
		{"LLVM_ENABLE_LLD", "ON"},
		{"LIBUNWIND_ENABLE_ASSERTIONS", "OFF"},
		{"LIBUNWIND_USE_COMPILER_RT", "ON"},

		{"LLVM_HOST_TRIPLE", `"${ROSA_TRIPLE}"`},
		{"LLVM_DEFAULT_TARGET_TRIPLE", `"${ROSA_TRIPLE}"`},
		{"LLVM_ENABLE_PROJECTS", "'clang;lld;libclc'"},
		{"LLVM_ENABLE_RUNTIMES", "'compiler-rt;libcxx;libcxxabi;libunwind'"},
	}

	if !t.isStage0() {
		skipChecks := []string{
			// expensive, pointless to run here
			"benchmarks",
			// LLVM ERROR: Tried to execute an unknown external function: roundevenf
			"ExecutionEngine/Interpreter/intrinsics.ll",
			// clang: deadlocks with LLVM_BUILD_LLVM_DYLIB
			"crash-recovery-modules",
			// clang: fatal error: '__config_site' file not found
			"CodeGen/PowerPC/ppc-xmmintrin.c",
			"CodeGen/PowerPC/ppc-mmintrin.c",
			"CodeGen/PowerPC/ppc-emmintrin.c",
			"CodeGen/PowerPC/ppc-pmmintrin.c",
			"CodeGen/PowerPC/ppc-tmmintrin.c",
			"CodeGen/PowerPC/ppc-smmintrin.c",
			"CodeGenCUDA/amdgpu-alias-undef-symbols.cu",
			// cxx: fails on musl
			"close.dont-get-rid-of-buffer",
			"re/re.traits",
			"std/time",
			"localization/locales",
			"localization/locale.categories",
			"selftest/dsl/dsl.sh.py",
			"input.output/iostream.format",
			"locale-specific_form",
			// cxx: deadlocks
			"std/thread/thread.jthread",
			// unwind: fails on musl
			"eh_frame_fde_pc_range",
		}
		for i, s := range skipChecks {
			s = regexp.QuoteMeta(s)
			s = strings.ReplaceAll(s, "/", "\\/")
			skipChecks[i] = s
		}

		if presetOpts&OptLLVMNoLTO == 0 {
			cache = append(cache, []KV{
				// very expensive
				{"LLVM_ENABLE_LTO", "Thin"},
			}...)
		}

		cache = append(cache, []KV{
			// symbols: clock_gettime, mallopt
			{"COMPILER_RT_INCLUDE_TESTS", "OFF"},

			{"LLVM_LIT_ARGS", "'" + strings.Join([]string{
				"--verbose",
				"--filter-out='\\''" + strings.Join(skipChecks, "|") + "'\\''",
			}, " ") + "'"},
		}...)
	}

	return t.NewPackage("llvm", version, t.NewPatchedSource("llvm", version, newFromGitHub(
		"llvm/llvm-project",
		"llvmorg-"+version,
		checksum,
	), true, llvmPatches...), nil, &CMakeHelper{
		Append: []string{"llvm"},

		Cache: cache,
		Script: `
ln -s ld.lld /work/system/bin/ld

ln -s clang /work/system/bin/cc
ln -s clang++ /work/system/bin/c++
`,

		// LLVM_LINK_LLVM_DYLIB causes llvm test suite to leak system
		// installation into test environment, and the tests end up testing the
		// system installation instead. Tests are disabled on stage0 and relies
		// on 3-stage determinism to test later stages.
		SkipTest: t.isStage0(),

		Test: `
chmod +w /bin && ln -s \
	../system/bin/chmod \
	../system/bin/mkdir \
	../system/bin/rm \
	../system/bin/tr \
	../system/bin/awk \
	/bin
ninja ` + jobsFlagE + ` check-all
`,
	},
		Python,
		Perl,
		Diffutils,
		Bash,
		Gawk,
		Coreutils,
		Findutils,

		Zlib,
		Zstd,
		muslHeaders,
		KernelHeaders,
	), version
}
func init() {
	artifactsM[LLVM] = Metadata{
		f: Toolchain.newLLVM,

		Name:        "llvm",
		Description: "a collection of modular and reusable compiler and toolchain technologies",
		Website:     "https://llvm.org",

		Dependencies: P{
			Zlib,
			Zstd,
			Musl,
		},

		ID: 1830,
	}
}