#!/usr/bin/env python3
import glob
import os
import subprocess
import sys
from dataclasses import dataclass
from typing import Iterable
from typing import Optional

LIBS = {}
MODS = {}
STD_MODULE = """module std [system] {
  textual header "/usr/include/alloca.h"
  textual header "/usr/include/assert.h"
  textual header "/usr/include/c++/13.2.1/algorithm"
  textual header "/usr/include/c++/13.2.1/array"
  textual header "/usr/include/c++/13.2.1/chrono"
  textual header "/usr/include/c++/13.2.1/cstddef"
  textual header "/usr/include/c++/13.2.1/cstdint"
  textual header "/usr/include/c++/13.2.1/cstdio"
  textual header "/usr/include/c++/13.2.1/cstdlib"
  textual header "/usr/include/c++/13.2.1/cstring"
  textual header "/usr/include/c++/13.2.1/iomanip"
  textual header "/usr/include/c++/13.2.1/iosfwd"
  textual header "/usr/include/c++/13.2.1/limits"
  textual header "/usr/include/c++/13.2.1/memory"
  textual header "/usr/include/c++/13.2.1/ostream"
  textual header "/usr/include/c++/13.2.1/random"
  textual header "/usr/include/c++/13.2.1/stdlib.h"
  textual header "/usr/include/c++/13.2.1/thread"
  textual header "/usr/include/c++/13.2.1/type_traits"
  textual header "/usr/include/c++/13.2.1/vector"
  textual header "/usr/include/errno.h"
  textual header "/usr/include/fortify/stdio.h"
  textual header "/usr/include/fortify/string.h"
  textual header "/usr/include/fortify/unistd.h"
  textual header "/usr/include/limits.h"
  textual header "/usr/include/stdarg.h"
  textual header "/usr/include/stdbool.h"
  textual header "/usr/include/stddef.h"
  textual header "/usr/include/stdint.h"
  textual header "/usr/include/sys/time.h"
  textual header "/usr/include/sys/types.h"
  textual header "/usr/include/time.h"
}
module "//c-toxcore/third_party:cmp" {
  header "third_party/cmp/cmp.h"
  use std
}
module "//c-toxcore/toxencryptsave:defines" {
  header "toxencryptsave/defines.h"
}
module "@com_google_googletest//:gtest" {
  textual header "/usr/include/gmock/gmock.h"
  textual header "/usr/include/gtest/gtest.h"
  use std
}
module "@libsodium" {
  textual header "/usr/include/sodium.h"
}
module "@pthread" {
  textual header "/usr/include/pthread.h"
}
module "@psocket" {
  textual header "/usr/include/arpa/inet.h"
  textual header "/usr/include/fcntl.h"
  textual header "/usr/include/fortify/sys/socket.h"
  textual header "/usr/include/linux/if.h"
  textual header "/usr/include/netdb.h"
  textual header "/usr/include/netinet/in.h"
  textual header "/usr/include/sys/epoll.h"
  textual header "/usr/include/sys/ioctl.h"
}
"""


@dataclass
class Context:
    pkg: str
    pkg_prefix: str

    def bzl_load(self, bzl: str, *syms: str) -> None:
        pass

    def bzl_exports_files(
            self,
            srcs: list[str],
            visibility: Optional[list[str]] = None,
    ) -> None:
        pass

    def bzl_cc_library(
            self,
            name: str,
            srcs: Iterable[str] = tuple(),
            hdrs: Iterable[str] = tuple(),
            deps: Iterable[str] = tuple(),
            visibility: Iterable[str] = tuple(),
            testonly: bool = False,
            copts: Iterable[str] = tuple(),
    ) -> None:
        LIBS[name] = {
            "srcs":
            srcs,
            "deps": [
                f"{self.pkg_prefix}{dep}" if dep[0] == ":" else dep
                for dep in deps
            ],
            "hdrs":
            hdrs,
        }

    def bzl_cc_test(
            self,
            name: str,
            srcs: Iterable[str] = tuple(),
            hdrs: Iterable[str] = tuple(),
            deps: Iterable[str] = tuple(),
            **kwargs: list[str],
    ) -> None:
        LIBS[name] = {
            "srcs":
            srcs,
            "deps": [
                f"{self.pkg_prefix}{dep}" if dep[0] == ":" else dep
                for dep in deps
            ],
            "hdrs":
            hdrs,
        }

    def bzl_cc_fuzz_test(self, name: str, **kwargs: list[str]) -> None:
        pass

    def bzl_select(self, selector: dict[str, list[str]]) -> list[str]:
        return selector["//tools/config:linux"]

    def bzl_glob(self, include: list[str]) -> list[str]:
        return [
            f[len(self.pkg) + 1:] for p in include
            for f in glob.glob(os.path.join(self.pkg, p))
        ]

    def bzl_alias(self, name: str, actual: str, visibility: list[str]) -> None:
        pass

    def bzl_sh_library(self, name: str, **kwargs: list[str]) -> None:
        pass


def main() -> None:
    srcs: list[str] = []
    for pkg in ("toxcore", ):
        # TODO(iphydf): Why does this break everything?
        # ctx = Context(pkg, "//c-toxcore/{pkg}")
        ctx = Context(pkg, "")
        with open(os.path.join(pkg, "BUILD.bazel"), "r") as fh:
            exec(
                fh.read(),
                {
                    "load": ctx.bzl_load,
                    "exports_files": ctx.bzl_exports_files,
                    "cc_library": ctx.bzl_cc_library,
                    "cc_test": ctx.bzl_cc_test,
                    "cc_fuzz_test": ctx.bzl_cc_fuzz_test,
                    "select": ctx.bzl_select,
                    "glob": ctx.bzl_glob,
                    "alias": ctx.bzl_alias,
                    "sh_library": ctx.bzl_sh_library,
                },
            )

        with open("module.modulemap", "w") as fh:
            fh.write(STD_MODULE)
            for name, lib in LIBS.items():
                fh.write(f'module "{ctx.pkg_prefix}:{name}"' + " {\n")
                for hdr in lib["hdrs"]:
                    fh.write(f'  header "{pkg}/{hdr}"\n')
                fh.write(f"  use std\n")
                for dep in lib.get("deps", []):
                    fh.write(f'  use "{dep}"\n')
                fh.write("}\n")

        for name, lib in LIBS.items():
            for src in lib.get("srcs", []):
                MODS[os.path.join(pkg, src)] = name
        srcs.extend(
            os.path.join(pkg, src)  # just within a package for now
            for lib in LIBS.values() for src in lib.get("srcs", []))
    # subprocess.run(["cat", "module.modulemap"], check=True)
    for src in sorted(
            set(srcs) - set([
                # TODO(iphydf): Figure out what's wrong here.
                "toxcore/crypto_core_test.cc",
                "toxcore/group_announce_test.cc",
                "toxcore/group_moderation_test.cc",
                "toxcore/mono_time_test.cc",
                "toxcore/network_test.cc",
                "toxcore/ping_array_test.cc",
                "toxcore/util_test.cc",
            ])):
        print(f"Validating {src}", file=sys.stderr)
        subprocess.run(
            [
                "clang",
                "-fsyntax-only",
                "-xc++",
                "-Wall",
                "-Werror",
                "-Wno-missing-braces",
                "-DTCP_SERVER_USE_EPOLL",
                "-std=c++23",
                "-fdiagnostics-color=always",
                "-fmodules",
                "-fmodules-strict-decluse",
                "-fmodule-map-file=module.modulemap",
                f"-fmodule-name={ctx.pkg_prefix}:{MODS[src]}",
                src,
            ],
            check=True,
        )


if __name__ == "__main__":
    main()