-module(telega@file).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/telega/file.gleam").
-export([from_string/1, from_file/1, from_file_with_name/2, from_bytes/2, read_file/1, to_json_value/1, requires_multipart/1, get_attach_name/1, to_multipart_file/1, download_by_path/2, download_file/2, download_to_file/3, get_file_info/2]).
-export_type([media_input/0, multipart_file/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(
    " File handling utilities for Telegram Bot API\n"
    " Provides types and functions for working with files in media uploads\n"
).

-type media_input() :: {url, binary()} |
    {file_id, binary()} |
    {local_file, binary(), binary()} |
    {bytes, bitstring(), binary(), binary()}.

-type multipart_file() :: {multipart_file,
        binary(),
        binary(),
        bitstring(),
        gleam@option:option(binary())}.

-file("src/telega/file.gleam", 33).
?DOC(" Creates a MediaInput from a string that could be URL or file ID\n").
-spec from_string(binary()) -> media_input().
from_string(Value) ->
    case {gleam_stdlib:string_starts_with(Value, <<"http://"/utf8>>),
        gleam_stdlib:string_starts_with(Value, <<"https://"/utf8>>)} of
        {true, _} ->
            {url, Value};

        {_, true} ->
            {url, Value};

        {_, _} ->
            {file_id, Value}
    end.

-file("src/telega/file.gleam", 44).
?DOC(" Creates a MediaInput from a local file path\n").
-spec from_file(binary()) -> media_input().
from_file(Path) ->
    Attach_name = <<"file_"/utf8,
        (gleam@string:replace(Path, <<"/"/utf8>>, <<"_"/utf8>>))/binary>>,
    {local_file, Path, Attach_name}.

-file("src/telega/file.gleam", 50).
?DOC(" Creates a MediaInput from a local file path with custom attach name\n").
-spec from_file_with_name(binary(), binary()) -> media_input().
from_file_with_name(Path, Attach_name) ->
    {local_file, Path, Attach_name}.

-file("src/telega/file.gleam", 55).
?DOC(" Creates a MediaInput from bytes\n").
-spec from_bytes(bitstring(), binary()) -> media_input().
from_bytes(Data, Filename) ->
    Attach_name = <<"bytes_"/utf8, Filename/binary>>,
    {bytes, Data, Filename, Attach_name}.

-file("src/telega/file.gleam", 61).
?DOC(" Reads a file and creates a MediaInput with its contents\n").
-spec read_file(binary()) -> {ok, media_input()} |
    {error, simplifile:file_error()}.
read_file(Path) ->
    gleam@result:'try'(
        simplifile_erl:read_bits(Path),
        fun(Data) ->
            Filename = case gleam@string:split(Path, <<"/"/utf8>>) of
                [] ->
                    <<"file"/utf8>>;

                Parts ->
                    case gleam@list:last(Parts) of
                        {ok, Name} ->
                            Name;

                        {error, _} ->
                            <<"file"/utf8>>
                    end
            end,
            {ok, from_bytes(Data, Filename)}
        end
    ).

-file("src/telega/file.gleam", 77).
?DOC(
    " Gets the string representation for JSON encoding\n"
    " For local files and bytes, returns the attach:// reference\n"
).
-spec to_json_value(media_input()) -> binary().
to_json_value(Input) ->
    case Input of
        {url, Url} ->
            Url;

        {file_id, Id} ->
            Id;

        {local_file, _, Attach_name} ->
            <<"attach://"/utf8, Attach_name/binary>>;

        {bytes, _, _, Attach_name@1} ->
            <<"attach://"/utf8, Attach_name@1/binary>>
    end.

-file("src/telega/file.gleam", 87).
?DOC(" Checks if this MediaInput requires multipart upload\n").
-spec requires_multipart(media_input()) -> boolean().
requires_multipart(Input) ->
    case Input of
        {local_file, _, _} ->
            true;

        {bytes, _, _, _} ->
            true;

        {url, _} ->
            false;

        {file_id, _} ->
            false
    end.

-file("src/telega/file.gleam", 95).
?DOC(" Gets the attach name if this is a local file or bytes\n").
-spec get_attach_name(media_input()) -> gleam@option:option(binary()).
get_attach_name(Input) ->
    case Input of
        {local_file, _, Name} ->
            {some, Name};

        {bytes, _, _, Name} ->
            {some, Name};

        _ ->
            none
    end.

-file("src/telega/file.gleam", 158).
?DOC(" Simple MIME type detection based on file extension\n").
-spec detect_mime_type(binary()) -> gleam@option:option(binary()).
detect_mime_type(Filename) ->
    Extension = case gleam@string:split(Filename, <<"."/utf8>>) of
        [] ->
            <<""/utf8>>;

        Parts ->
            case gleam@list:last(Parts) of
                {ok, Ext} ->
                    string:lowercase(Ext);

                {error, _} ->
                    <<""/utf8>>
            end
    end,
    case Extension of
        <<"jpg"/utf8>> ->
            {some, <<"image/jpeg"/utf8>>};

        <<"jpeg"/utf8>> ->
            {some, <<"image/jpeg"/utf8>>};

        <<"png"/utf8>> ->
            {some, <<"image/png"/utf8>>};

        <<"gif"/utf8>> ->
            {some, <<"image/gif"/utf8>>};

        <<"webp"/utf8>> ->
            {some, <<"image/webp"/utf8>>};

        <<"mp4"/utf8>> ->
            {some, <<"video/mp4"/utf8>>};

        <<"avi"/utf8>> ->
            {some, <<"video/x-msvideo"/utf8>>};

        <<"mkv"/utf8>> ->
            {some, <<"video/x-matroska"/utf8>>};

        <<"webm"/utf8>> ->
            {some, <<"video/webm"/utf8>>};

        <<"mp3"/utf8>> ->
            {some, <<"audio/mpeg"/utf8>>};

        <<"ogg"/utf8>> ->
            {some, <<"audio/ogg"/utf8>>};

        <<"wav"/utf8>> ->
            {some, <<"audio/wav"/utf8>>};

        <<"pdf"/utf8>> ->
            {some, <<"application/pdf"/utf8>>};

        <<"zip"/utf8>> ->
            {some, <<"application/zip"/utf8>>};

        <<"json"/utf8>> ->
            {some, <<"application/json"/utf8>>};

        <<"xml"/utf8>> ->
            {some, <<"application/xml"/utf8>>};

        _ ->
            none
    end.

-file("src/telega/file.gleam", 117).
?DOC(" Converts MediaInput to MultipartFile for upload\n").
-spec to_multipart_file(media_input()) -> {ok,
        gleam@option:option(multipart_file())} |
    {error, simplifile:file_error()}.
to_multipart_file(Input) ->
    case Input of
        {url, _} ->
            {ok, none};

        {file_id, _} ->
            {ok, none};

        {local_file, Path, Attach_name} ->
            gleam@result:'try'(
                simplifile_erl:read_bits(Path),
                fun(Content) ->
                    Filename = case gleam@string:split(Path, <<"/"/utf8>>) of
                        [] ->
                            <<"file"/utf8>>;

                        Parts ->
                            case gleam@list:last(Parts) of
                                {ok, Name} ->
                                    Name;

                                {error, _} ->
                                    <<"file"/utf8>>
                            end
                    end,
                    {ok,
                        {some,
                            {multipart_file,
                                Attach_name,
                                Filename,
                                Content,
                                detect_mime_type(Filename)}}}
                end
            );

        {bytes, Data, Filename@1, Attach_name@1} ->
            {ok,
                {some,
                    {multipart_file,
                        Attach_name@1,
                        Filename@1,
                        Data,
                        detect_mime_type(Filename@1)}}}
    end.

-file("src/telega/file.gleam", 270).
?DOC(" Builds the full URL for downloading a file from Telegram\n").
-spec build_file_url(telega@client:telegram_client(), binary()) -> binary().
build_file_url(Client, File_path) ->
    Api_url = telega@client:get_api_url(Client),
    Base_url = case Api_url of
        <<"https://api.telegram.org/bot"/utf8>> ->
            <<"https://api.telegram.org/file"/utf8>>;

        Custom ->
            case gleam_stdlib:string_ends_with(Custom, <<"/bot"/utf8>>) of
                true ->
                    <<(gleam@string:drop_end(Custom, 4))/binary, "/file"/utf8>>;

                false ->
                    <<Custom/binary, "/file"/utf8>>
            end
    end,
    <<<<<<<<Base_url/binary, "/bot"/utf8>>/binary,
                (telega@client:get_token(Client))/binary>>/binary,
            "/"/utf8>>/binary,
        File_path/binary>>.

-file("src/telega/file.gleam", 213).
?DOC(
    " Downloads a file using its file_path from the File object.\n"
    "\n"
    " Requires a `FetchBitsClient` to be configured on the client\n"
    " (via `client.set_fetch_bits_client`). Adapter packages like\n"
    " `telega_httpc` configure this automatically.\n"
).
-spec download_by_path(telega@client:telegram_client(), binary()) -> {ok,
        bitstring()} |
    {error, binary()}.
download_by_path(Client, File_path) ->
    Url = build_file_url(Client, File_path),
    gleam@result:'try'(case telega@client:get_fetch_bits_client(Client) of
            {some, F} ->
                {ok, F};

            none ->
                {error,
                    <<"No FetchBitsClient configured. Use client.set_fetch_bits_client or an adapter like telega_httpc that provides one."/utf8>>}
        end, fun(Fetch_bits) ->
            gleam@result:'try'(
                begin
                    _pipe = gleam@http@request:to(Url),
                    gleam@result:map_error(
                        _pipe,
                        fun(_) ->
                            <<"Failed to build request for: "/utf8, Url/binary>>
                        end
                    )
                end,
                fun(Req) ->
                    Bits_req = gleam@http@request:set_body(Req, <<>>),
                    gleam@result:'try'(
                        begin
                            _pipe@1 = Fetch_bits(Bits_req),
                            gleam@result:map_error(
                                _pipe@1,
                                fun(E) ->
                                    <<<<<<"Failed to download file from: "/utf8,
                                                Url/binary>>/binary,
                                            " — "/utf8>>/binary,
                                        (gleam@string:inspect(E))/binary>>
                                end
                            )
                        end,
                        fun(Resp) -> case erlang:element(2, Resp) of
                                200 ->
                                    {ok, erlang:element(4, Resp)};

                                Status ->
                                    {error,
                                        <<"Download failed with status: "/utf8,
                                            (erlang:integer_to_binary(Status))/binary>>}
                            end end
                    )
                end
            )
        end).

-file("src/telega/file.gleam", 191).
?DOC(
    " Downloads a file from Telegram servers\n"
    " First gets the file path using getFile API, then downloads the actual file\n"
).
-spec download_file(telega@client:telegram_client(), binary()) -> {ok,
        bitstring()} |
    {error, binary()}.
download_file(Client, File_id) ->
    gleam@result:'try'(
        begin
            _pipe = telega@api:get_file(Client, File_id),
            gleam@result:map_error(
                _pipe,
                fun(E) ->
                    <<"Failed to get file info: "/utf8,
                        (gleam@string:inspect(E))/binary>>
                end
            )
        end,
        fun(File_info) -> case erlang:element(5, File_info) of
                none ->
                    {error, <<"File path not available"/utf8>>};

                {some, Path} ->
                    download_by_path(Client, Path)
            end end
    ).

-file("src/telega/file.gleam", 249).
?DOC(" Downloads a file and saves it to disk\n").
-spec download_to_file(telega@client:telegram_client(), binary(), binary()) -> {ok,
        nil} |
    {error, binary()}.
download_to_file(Client, File_id, Save_path) ->
    gleam@result:'try'(
        download_file(Client, File_id),
        fun(Content) -> _pipe = simplifile_erl:write_bits(Save_path, Content),
            gleam@result:map_error(
                _pipe,
                fun(E) ->
                    <<"Failed to save file: "/utf8,
                        (gleam@string:inspect(E))/binary>>
                end
            ) end
    ).

-file("src/telega/file.gleam", 261).
?DOC(" Gets file information without downloading\n").
-spec get_file_info(telega@client:telegram_client(), binary()) -> {ok,
        telega@model@types:file()} |
    {error, binary()}.
get_file_info(Client, File_id) ->
    _pipe = telega@api:get_file(Client, File_id),
    gleam@result:map_error(
        _pipe,
        fun(E) ->
            <<"Failed to get file info: "/utf8,
                (gleam@string:inspect(E))/binary>>
        end
    ).