load("//bazel:macros.bzl", "exports_files_legacy")
load("@rules_cc//cc:defs.bzl", "cc_toolchain", "cc_toolchain_suite")
load(":linux_amd64_toolchain_config.bzl", "provide_linux_amd64_toolchain_config")
load(":mac_m1_toolchain_config.bzl", "provide_mac_m1_toolchain_config")

licenses(["notice"])

exports_files_legacy()

# https://bazel.build/reference/be/c-cpp#cc_toolchain_suite
# cc_toolchain_suite will fetch deps for toolchains it will not use, which
# is why we split up the suites by OS. When attempting to fetch "@clang_linux_amd64//:all_files",
# a script compiled for linux to extract ar archives will break on other platforms.
cc_toolchain_suite(
    name = "clang_suite_linux",
    toolchains = {
        # The key is target_cpu|compiler
        # compiler appears to be a string we can choose arbitrarily
        # https://bazel.build/reference/command-line-reference?hl=en#flag--compiler
        "k8|host_is_linux_amd64": ":linux_amd64_host",
        "x86_64|host_is_linux_amd64": ":linux_amd64_host",
        "k8": ":linux_amd64_host",
    },
)

cc_toolchain_suite(
    name = "clang_suite_mac",
    toolchains = {
        "arm64|host_is_mac_m1": ":mac_m1_host",
        "darwin|host_is_mac_m1": ":mac_m1_host",
        "darwin_arm64|host_is_mac_m1": ":mac_m1_host",
        "darwin_x86_64": ":mac_m1_host",
    },
)

filegroup(name = "not_implemented")

filegroup(
    name = "archive_linux_amd64_files",
    srcs = [
        "linux_trampolines/ar_trampoline_linux.sh",
        "@clang_linux_amd64//:archive_files",
    ],
)

filegroup(
    name = "compile_linux_amd64_files",
    srcs = [
        "linux_trampolines/IWYU_mapping.imp",
        "linux_trampolines/clang_trampoline_linux.sh",
        "@clang_linux_amd64//:compile_files",
    ],
)

filegroup(
    name = "link_linux_amd64_files",
    srcs = [
        # Bazel assumes it is talking to Clang when linking.
        "linux_trampolines/clang_trampoline_linux.sh",
        "@clang_linux_amd64//:link_files",
    ],
)

filegroup(
    name = "all_mac_m1_files",
    srcs = [
        "mac_trampolines/ar_trampoline_mac.sh",
        "mac_trampolines/clang_trampoline_mac.sh",
        "mac_trampolines/lld_trampoline_mac.sh",
        "@clang_mac_m1//:all_files",
    ],
)

provide_linux_amd64_toolchain_config(
    name = "linux_amd64_toolchain_config",
)

provide_mac_m1_toolchain_config(
    name = "mac_m1_toolchain_config",
)

# https://bazel.build/reference/be/c-cpp#cc_toolchain
cc_toolchain(
    name = "linux_amd64_host",
    all_files = ":not_implemented",
    ar_files = ":archive_linux_amd64_files",
    compiler_files = ":compile_linux_amd64_files",
    dwp_files = ":not_implemented",
    linker_files = ":link_linux_amd64_files",
    objcopy_files = ":not_implemented",
    strip_files = ":not_implemented",
    supports_param_files = False,
    toolchain_config = ":linux_amd64_toolchain_config",
)

cc_toolchain(
    name = "mac_m1_host",
    all_files = ":all_mac_m1_files",
    ar_files = ":all_mac_m1_files",
    compiler_files = ":all_mac_m1_files",
    dwp_files = ":not_implemented",
    linker_files = ":all_mac_m1_files",
    objcopy_files = ":not_implemented",
    strip_files = ":not_implemented",
    supports_param_files = False,
    toolchain_config = ":mac_m1_toolchain_config",
)