-module(tinman).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/tinman.gleam").
-export([os/0, hostname/0, endianness/0, runtime/0, process_id/0, is_test/0, is_online/0, used_memory/0, cpu_count/0, available_parallelism/0, end_of_line/0, path_delimiter/0, path_separator/0, executable_extension/0, parse_version/1, runtime_version/0, libc/0, user_name/0, user_id/0, group_id/0, is_admin/0, os_version/0, total_disk_space/0, free_disk_space/0, total_memory/0, free_memory/0, container_runtime/0, is_ci/0, is_in_ssh/0, is_tty/0, cpu_architecture/0]).
-export_type([operating_system/0, cpu_architecture/0, runtime/0, libc/0, endianness/0, container_runtime/0, version/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

?MODULEDOC(
    " Tinman allows you to query information about the operating system, runtime\n"
    " and environment.\n"
    "\n"
    " It's useful for working around platform quirks or setting up global\n"
    " resource limits at startup. It's **not** suitable as a monitoring library.\n"
    "\n"
).

-type operating_system() :: linux | macos | windows | free_bsd | open_bsd.

-type cpu_architecture() :: x64 | arm64 | arm | riscv64.

-type runtime() :: beam | atom_vm | node | deno | bun.

-type libc() :: glibc | musl.

-type endianness() :: big_endian | little_endian.

-type container_runtime() :: docker | podman | wsl.

-type version() :: {version, integer(), integer(), integer()}.

-file("src/tinman.gleam", 70).
?DOC(
    " Returns the operating system platform.\n"
    " Returns `Error(Nil)` if the platform cannot be determined or is unknown.\n"
).
-spec os() -> {ok, operating_system()} | {error, nil}.
os() ->
    case tinman_ffi:platform() of
        <<"linux"/utf8>> ->
            {ok, linux};

        <<"darwin"/utf8>> ->
            {ok, macos};

        <<"win32"/utf8>> ->
            {ok, windows};

        <<"freebsd"/utf8>> ->
            {ok, free_bsd};

        <<"openbsd"/utf8>> ->
            {ok, open_bsd};

        _ ->
            {error, nil}
    end.

-file("src/tinman.gleam", 128).
?DOC(" Returns the hostname of the system.\n").
-spec hostname() -> binary().
hostname() ->
    tinman_ffi:hostname().

-file("src/tinman.gleam", 133).
?DOC(" Returns the byte order of the system.\n").
-spec endianness() -> endianness().
endianness() ->
    tinman_ffi:endianness().

-file("src/tinman.gleam", 157).
?DOC(
    " Returns the current runtime (Erlang, Node, Deno, or Bun).\n"
    " Returns `Error(Nil)` if the runtime cannot be determined.\n"
).
-spec runtime() -> {ok, runtime()} | {error, nil}.
runtime() ->
    case tinman_ffi:runtime() of
        <<"BEAM"/utf8>> ->
            {ok, beam};

        <<"ATOM"/utf8>> ->
            {ok, atom_vm};

        <<"node"/utf8>> ->
            {ok, node};

        <<"deno"/utf8>> ->
            {ok, deno};

        <<"bun"/utf8>> ->
            {ok, bun};

        _ ->
            {error, nil}
    end.

-file("src/tinman.gleam", 188).
?DOC(" Returns the runtimes operating system process ID.\n").
-spec process_id() -> integer().
process_id() ->
    tinman_ffi:process_id().

-file("src/tinman.gleam", 221).
?DOC(
    " Returns whether the program is running in test mode.\n"
    "\n"
    " Checks if the entrypoint module is `_test`, which is the case when running\n"
    " with `gleam test`.\n"
).
-spec is_test() -> boolean().
is_test() ->
    tinman_ffi:is_test().

-file("src/tinman.gleam", 228).
?DOC(
    " Returns whether the system appears to be online.\n"
    "\n"
    " Checks if there is an active non-loopback network interface available.\n"
).
-spec is_online() -> boolean().
is_online() ->
    tinman_ffi:is_online().

-file("src/tinman.gleam", 261).
?DOC(" Returns the memory used by the runtime and your program.\n").
-spec used_memory() -> integer().
used_memory() ->
    tinman_ffi:used_memory().

-file("src/tinman.gleam", 402).
?DOC(
    " Returns the number of logical CPU cores.\n"
    " Returns `Error(Nil)` if the CPU count cannot be determined.\n"
    "\n"
    " > *Note:* Usually you want to use `available_parallelism` instead!\n"
).
-spec cpu_count() -> {ok, integer()} | {error, nil}.
cpu_count() ->
    tinman_ffi:cpu_count().

-file("src/tinman.gleam", 411).
?DOC(
    " Returns the recommended level of parallelism.\n"
    "\n"
    " This is the number of available schedulers on Erlang, or the number of\n"
    " runtime threads on Javascript. Note that Javascript itself is always\n"
    " single-threaded by default.\n"
).
-spec available_parallelism() -> integer().
available_parallelism() ->
    tinman_ffi:available_parallelism().

-file("src/tinman.gleam", 474).
?DOC(
    " Returns the end-of-line marker for the current platform.\n"
    " `\"\\n\"` on Unix-like systems, `\"\\r\\n\"` on Windows.\n"
).
-spec end_of_line() -> binary().
end_of_line() ->
    case tinman_ffi:is_windows() of
        true ->
            <<"\r\n"/utf8>>;

        false ->
            <<"\n"/utf8>>
    end.

-file("src/tinman.gleam", 484).
?DOC(
    " Returns the path delimiter - the character used inside the `PATH` environment\n"
    " variable to separate multiple paths - for the current platform.\n"
    " `\":\"` on Unix-like systems, `\";\"` on Windows.\n"
).
-spec path_delimiter() -> binary().
path_delimiter() ->
    case tinman_ffi:is_windows() of
        true ->
            <<";"/utf8>>;

        false ->
            <<":"/utf8>>
    end.

-file("src/tinman.gleam", 494).
?DOC(
    " Returns the path separator - the character used inside paths to separate\n"
    " files and directories - for the current platform.\n"
    " `\"/\"` on Unix-like systems, `\"\\\\\"` on Windows.\n"
).
-spec path_separator() -> binary().
path_separator() ->
    case tinman_ffi:is_windows() of
        true ->
            <<"\\"/utf8>>;

        false ->
            <<"/"/utf8>>
    end.

-file("src/tinman.gleam", 503).
?DOC(
    " Returns the executable file extension for the current platform.\n"
    " `\".exe\"` on Windows, `\"\"` (empty string) on Unix-like systems.\n"
).
-spec executable_extension() -> binary().
executable_extension() ->
    case tinman_ffi:is_windows() of
        true ->
            <<".exe"/utf8>>;

        false ->
            <<""/utf8>>
    end.

-file("src/tinman.gleam", 512).
-spec int(binary()) -> {ok, integer()} | {error, nil}.
int(S) ->
    gleam_stdlib:parse_int(gleam@string:trim(S)).

-file("src/tinman.gleam", 527).
-spec split_whitespace(binary()) -> list(binary()).
split_whitespace(Text) ->
    _pipe = Text,
    _pipe@1 = gleam@string:split(_pipe, <<" "/utf8>>),
    gleam@list:filter(_pipe@1, fun(S) -> S /= <<""/utf8>> end).

-file("src/tinman.gleam", 531).
-spec extract_column(binary(), integer()) -> {ok, binary()} | {error, nil}.
extract_column(Line, Column) ->
    _pipe = Line,
    _pipe@1 = split_whitespace(_pipe),
    _pipe@2 = gleam@list:drop(_pipe@1, Column - 1),
    gleam@list:first(_pipe@2).

-file("src/tinman.gleam", 359).
-spec parse_df_column(binary(), integer()) -> {ok, integer()} | {error, nil}.
parse_df_column(Line, Column) ->
    gleam@result:'try'(
        extract_column(Line, Column),
        fun(Kb_str) ->
            gleam@result:'try'(int(Kb_str), fun(Kb) -> {ok, Kb * 1024} end)
        end
    ).

-file("src/tinman.gleam", 540).
?DOC(false).
-spec parse_version(binary()) -> {ok, version()} | {error, nil}.
parse_version(Version_string) ->
    Version_string@2 = case Version_string of
        <<"v"/utf8, Version_string@1/binary>> ->
            Version_string@1;

        Other ->
            Other
    end,
    case gleam@string:split(Version_string@2, <<"."/utf8>>) of
        [Major, Minor, Patch | _] ->
            gleam@result:'try'(
                gleam_stdlib:parse_int(Major),
                fun(Major@1) ->
                    gleam@result:'try'(
                        gleam_stdlib:parse_int(Minor),
                        fun(Minor@1) ->
                            gleam@result:'try'(
                                gleam_stdlib:parse_int(Patch),
                                fun(Patch@1) ->
                                    {ok, {version, Major@1, Minor@1, Patch@1}}
                                end
                            )
                        end
                    )
                end
            );

        [Major@2, Minor@2] ->
            gleam@result:'try'(
                gleam_stdlib:parse_int(Major@2),
                fun(Major@3) ->
                    gleam@result:'try'(
                        gleam_stdlib:parse_int(Minor@2),
                        fun(Minor@3) -> {ok, {version, Major@3, Minor@3, 0}} end
                    )
                end
            );

        [Major@4] ->
            gleam@result:'try'(
                gleam_stdlib:parse_int(Major@4),
                fun(Major@5) -> {ok, {version, Major@5, 0, 0}} end
            );

        _ ->
            {error, nil}
    end.

-file("src/tinman.gleam", 177).
?DOC(
    " Returns the runtime version.\n"
    " Returns `Error(Nil)` if the version cannot be determined or parsed.\n"
    "\n"
    " > **Note:** On Erlang, this is the version of the Erlang runtime system (ERTS),\n"
    " > not the version of the OTP release!\n"
).
-spec runtime_version() -> {ok, version()} | {error, nil}.
runtime_version() ->
    parse_version(tinman_ffi:runtime_version()).

-file("src/tinman.gleam", 93).
?DOC(
    " Returns the C standard library type (Linux only).\n"
    " Returns `Error(Nil)` on non-Linux systems or if detection fails.\n"
).
-spec libc() -> {ok, libc()} | {error, nil}.
libc() ->
    tinman_ffi:libc_type().

-file("src/tinman.gleam", 418).
?DOC(
    " Returns the current username.\n"
    " Returns `Error(Nil)` if the username cannot be determined.\n"
).
-spec user_name() -> binary().
user_name() ->
    Whoami = gleam@string:trim(tinman_ffi:os_cmd(<<"whoami"/utf8>>)),
    case tinman_ffi:is_windows() of
        true ->
            case gleam@string:split(Whoami, <<"\\"/utf8>>) of
                [_, Name | _] ->
                    Name;

                [Name@1] ->
                    Name@1;

                [] ->
                    Whoami
            end;

        false ->
            Whoami
    end.

-file("src/tinman.gleam", 435).
?DOC(
    " Returns the current user ID.\n"
    " Returns `Error(Nil)` if the user ID cannot be determined.\n"
).
-spec user_id() -> {ok, integer()} | {error, nil}.
user_id() ->
    case tinman_ffi:is_windows() of
        true ->
            {error, nil};

        false ->
            int(tinman_ffi:os_cmd(<<"id -u"/utf8>>))
    end.

-file("src/tinman.gleam", 445).
?DOC(
    " Returns the current group ID.\n"
    " Returns `Error(Nil)` if the group ID cannot be determined.\n"
).
-spec group_id() -> {ok, integer()} | {error, nil}.
group_id() ->
    case tinman_ffi:is_windows() of
        true ->
            {error, nil};

        false ->
            int(tinman_ffi:os_cmd(<<"id -g"/utf8>>))
    end.

-file("src/tinman.gleam", 455).
?DOC(
    " Returns whether the current user has administrator/root privileges.\n"
    " On Unix-like systems, checks if the user ID is `0` (root).\n"
    " On Windows, checks if we can successfully run a utility with elevated privileges.\n"
).
-spec is_admin() -> boolean().
is_admin() ->
    case tinman_ffi:is_windows() of
        true ->
            Output = tinman_ffi:os_cmd(<<"fltmc >nul 2>&1 && echo OK"/utf8>>),
            gleam_stdlib:contains_string(Output, <<"OK"/utf8>>);

        false ->
            case user_id() of
                {ok, 0} ->
                    true;

                _ ->
                    false
            end
    end.

-file("src/tinman.gleam", 516).
-spec powershell(binary()) -> binary().
powershell(Cmd) ->
    case tinman_ffi:os_cmd(
        <<<<"pwsh -NoProfile -NonInteractive -Command \""/utf8, Cmd/binary>>/binary,
            "\" 2>nul"/utf8>>
    ) of
        <<""/utf8>> ->
            tinman_ffi:os_cmd(
                <<<<"powershell -NoProfile -NonInteractive -Command \""/utf8,
                        Cmd/binary>>/binary,
                    "\""/utf8>>
            );

        Output ->
            Output
    end.

-file("src/tinman.gleam", 109).
?DOC(
    " Returns the operating system version.\n"
    " Returns `Error(Nil)` if the version cannot be determined or parsed.\n"
).
-spec os_version() -> {ok, version()} | {error, nil}.
os_version() ->
    case tinman_ffi:is_windows() of
        true ->
            parse_version(
                powershell(
                    <<"[System.Environment]::OSVersion.Version.ToString()"/utf8>>
                )
            );

        false ->
            tinman_ffi:version()
    end.

-file("src/tinman.gleam", 327).
?DOC(
    " Returns the total disk space in bytes for the root/system drive.\n"
    " Uses `df` on Unix-like systems and PowerShell on Windows.\n"
    " Returns `Error(Nil)` if the information cannot be determined.\n"
).
-spec total_disk_space() -> {ok, integer()} | {error, nil}.
total_disk_space() ->
    case tinman_ffi:is_windows() of
        true ->
            int(
                powershell(
                    <<"(Get-PSDrive C).Used + (Get-PSDrive C).Free"/utf8>>
                )
            );

        false ->
            Output = tinman_ffi:os_cmd(<<"df -k / | tail -n 1"/utf8>>),
            parse_df_column(Output, 2)
    end.

-file("src/tinman.gleam", 344).
?DOC(
    " Returns the free disk space in bytes for the root/system drive.\n"
    " Uses `df` on Unix-like systems and PowerShell on Windows.\n"
    " Returns `Error(Nil)` if the information cannot be determined.\n"
).
-spec free_disk_space() -> {ok, integer()} | {error, nil}.
free_disk_space() ->
    case tinman_ffi:is_windows() of
        true ->
            int(powershell(<<"(Get-PSDrive C).Free"/utf8>>));

        false ->
            Output = tinman_ffi:os_cmd(<<"df -k / | tail -n 1"/utf8>>),
            parse_df_column(Output, 4)
    end.

-file("src/tinman.gleam", 307).
-spec cgroup(binary()) -> {ok, integer()} | {error, nil}.
cgroup(Path) ->
    case tinman_ffi:read_file(<<"/sys/fs/cgroup/"/utf8, Path/binary>>) of
        {ok, Content} ->
            int(Content);

        {error, _} ->
            {error, nil}
    end.

-file("src/tinman.gleam", 293).
-spec cgroup_memory_limit() -> {ok, integer()} | {error, nil}.
cgroup_memory_limit() ->
    case cgroup(<<"memory.max"/utf8>>) of
        {ok, Val} ->
            {ok, Val};

        {error, _} ->
            cgroup(<<"memory/memory.limit_in_bytes"/utf8>>)
    end.

-file("src/tinman.gleam", 300).
-spec cgroup_memory_usage() -> {ok, integer()} | {error, nil}.
cgroup_memory_usage() ->
    case cgroup(<<"memory.current"/utf8>>) of
        {ok, Val} ->
            {ok, Val};

        {error, _} ->
            cgroup(<<"memory/memory.usage_in_bytes"/utf8>>)
    end.

-file("src/tinman.gleam", 314).
-spec meminfo(binary()) -> {ok, integer()} | {error, nil}.
meminfo(Key) ->
    gleam@result:'try'(
        tinman_ffi:read_file(<<"/proc/meminfo"/utf8>>),
        fun(Content) ->
            gleam@result:'try'(
                gleam@list:last(gleam@string:split(Content, Key)),
                fun(Rest) ->
                    gleam@result:'try'(
                        extract_column(Rest, 1),
                        fun(Kb_str) ->
                            gleam@result:'try'(
                                int(Kb_str),
                                fun(Kb) -> {ok, Kb * 1024} end
                            )
                        end
                    )
                end
            )
        end
    ).

-file("src/tinman.gleam", 239).
?DOC(
    " Returns the total available system memory in bytes. When running inside a\n"
    " container, memory limits applied to the container are respected.\n"
    "\n"
    " > *Note:* This information is not exposed by the Erlang runtime system,\n"
    " > and has to be queried from the operating system in various ways.\n"
    " > Doing so might be unexpectedly slow, especially on Windows!\n"
).
-spec total_memory() -> {ok, integer()} | {error, nil}.
total_memory() ->
    case os() of
        {ok, linux} ->
            case cgroup_memory_limit() of
                {ok, Limit} ->
                    {ok, Limit};

                {error, _} ->
                    meminfo(<<"MemTotal:"/utf8>>)
            end;

        {ok, macos} ->
            int(tinman_ffi:os_cmd(<<"sysctl -n hw.memsize"/utf8>>));

        {ok, free_bsd} ->
            int(tinman_ffi:os_cmd(<<"sysctl -n hw.physmem64"/utf8>>));

        {ok, open_bsd} ->
            int(tinman_ffi:os_cmd(<<"sysctl -n hw.physmem64"/utf8>>));

        {ok, windows} ->
            int(
                powershell(
                    <<"(Get-CimInstance Win32_OperatingSystem).TotalVisibleMemorySize * 1024"/utf8>>
                )
            );

        {error, _} ->
            {error, nil}
    end.

-file("src/tinman.gleam", 270).
?DOC(
    " Returns the available system memory in bytes. When running inside a container,\n"
    " memory limits applied to the container are respected.\n"
    "\n"
    " > *Note:* This information is not exposed by the Erlang runtime system,\n"
    " > and has to be queried from the operating system in various ways.\n"
    " > Doing so might be unexpectedly slow, especially on Windows!\n"
).
-spec free_memory() -> {ok, integer()} | {error, nil}.
free_memory() ->
    case os() of
        {ok, linux} ->
            case {cgroup_memory_limit(), cgroup_memory_usage()} of
                {{ok, Limit}, {ok, Usage}} ->
                    {ok, gleam@int:max(0, Limit - Usage)};

                {{error, _}, _} ->
                    meminfo(<<"MemAvailable:"/utf8>>);

                {_, {error, _}} ->
                    meminfo(<<"MemAvailable:"/utf8>>)
            end;

        {ok, macos} ->
            Cmd = <<"vm_stat | awk 'NR==1{page_size=$8} /Pages free/{free=$3} /Pages inactive/{inactive=$3} END{print (free+inactive)*page_size}'"/utf8>>,
            int(tinman_ffi:os_cmd(Cmd));

        {ok, free_bsd} ->
            int(tinman_ffi:os_cmd(<<"sysctl -n hw.usermem64"/utf8>>));

        {ok, open_bsd} ->
            int(tinman_ffi:os_cmd(<<"sysctl -n hw.usermem64"/utf8>>));

        {ok, windows} ->
            int(
                powershell(
                    <<"(Get-CimInstance Win32_OperatingSystem).FreePhysicalMemory * 1024"/utf8>>
                )
            );

        {error, _} ->
            {error, nil}
    end.

-file("src/tinman.gleam", 138).
?DOC(
    " Returns the detected container runtime.\n"
    " Detects Docker, Podman, and WSL environments.\n"
    " Returns `Error(Nil)` if no container could be detected.\n"
).
-spec container_runtime() -> {ok, container_runtime()} | {error, nil}.
container_runtime() ->
    gleam@bool:guard(
        tinman_ffi:file_exists(<<"/.dockerenv"/utf8>>),
        {ok, docker},
        fun() ->
            gleam@bool:guard(
                tinman_ffi:file_exists(<<"/run/.containerenv"/utf8>>),
                {ok, podman},
                fun() ->
                    Version = begin
                        _pipe = tinman_ffi:read_file(<<"/proc/version"/utf8>>),
                        _pipe@1 = gleam@result:unwrap(_pipe, <<""/utf8>>),
                        string:lowercase(_pipe@1)
                    end,
                    gleam@bool:guard(
                        gleam_stdlib:contains_string(
                            Version,
                            <<"microsoft"/utf8>>
                        )
                        orelse gleam_stdlib:contains_string(
                            Version,
                            <<"wsl"/utf8>>
                        ),
                        {ok, wsl},
                        fun() -> {error, nil} end
                    )
                end
            )
        end
    ).

-file("src/tinman.gleam", 195).
?DOC(
    " Returns whether your program is running in a CI environment.\n"
    "\n"
    " Checks for `CI` and `CONTINUOUS_INTEGRATION` environment variables.\n"
).
-spec is_ci() -> boolean().
is_ci() ->
    (tinman_ffi:env(<<"CI"/utf8>>) /= <<""/utf8>>) orelse (tinman_ffi:env(
        <<"CONTINUOUS_INTEGRATION"/utf8>>
    )
    /= <<""/utf8>>).

-file("src/tinman.gleam", 202).
?DOC(
    " Returns whether your program is running in an SSH session.\n"
    "\n"
    " Checks for `SSH_CONNECTION`, `SSH_CLIENT`, and `SSH_TTY` environment variables.\n"
).
-spec is_in_ssh() -> boolean().
is_in_ssh() ->
    ((tinman_ffi:env(<<"SSH_CONNECTION"/utf8>>) /= <<""/utf8>>) orelse (tinman_ffi:env(
        <<"SSH_CLIENT"/utf8>>
    )
    /= <<""/utf8>>))
    orelse (tinman_ffi:env(<<"SSH_TTY"/utf8>>) /= <<""/utf8>>).

-file("src/tinman.gleam", 207).
?DOC(" Checks whether the program is running in an interactive terminal (TTY).\n").
-spec is_tty() -> boolean().
is_tty() ->
    tinman_ffi:is_tty() andalso (tinman_ffi:env(<<"TERM"/utf8>>) /= <<"DUMB"/utf8>>).

-file("src/tinman.gleam", 373).
?DOC(
    " Returns the CPU architecture.\n"
    " Returns `Error(Nil)` if the architecture cannot be determined or is unknown.\n"
).
-spec cpu_architecture() -> {ok, cpu_architecture()} | {error, nil}.
cpu_architecture() ->
    Arch = case tinman_ffi:is_windows() of
        true ->
            string:lowercase(tinman_ffi:env(<<"PROCESSOR_ARCHITECTURE"/utf8>>));

        false ->
            tinman_ffi:arch()
    end,
    case Arch of
        <<"x64"/utf8>> ->
            {ok, x64};

        <<"x86_64"/utf8>> ->
            {ok, x64};

        <<"amd64"/utf8>> ->
            {ok, x64};

        <<"arm64"/utf8>> ->
            {ok, arm64};

        <<"aarch64"/utf8>> ->
            {ok, arm64};

        <<"arm"/utf8>> ->
            {ok, arm};

        <<"riscv64"/utf8>> ->
            {ok, riscv64};

        _ ->
            {error, nil}
    end.