-module(anthropic@api).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/anthropic/api.gleam").
-export([chat/2, create_message/2, event_text/1, stream_text/1, stream_complete/1, stream_has_error/1, stream_message_id/1, stream_model/1, chat_stream/2, chat_stream_with_callback/3]).
-export_type([stream_result/0, stream_error/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(
    " API functions for Anthropic Messages API\n"
    "\n"
    " This module provides the core functions for interacting with Claude's\n"
    " Messages API, including message creation and response parsing.\n"
    "\n"
    " ## Quick Start\n"
    "\n"
    " For most use cases, use the unified chat functions:\n"
    "\n"
    " ```gleam\n"
    " import anthropic/api\n"
    " import anthropic/client\n"
    " import anthropic/types/request\n"
    " import anthropic/types/message.{user_message}\n"
    "\n"
    " // Initialize client\n"
    " let assert Ok(client) = client.init()\n"
    "\n"
    " // Create a request\n"
    " let req = request.new(\n"
    "   \"claude-sonnet-4-20250514\",\n"
    "   [user_message(\"Hello, Claude!\")],\n"
    "   1024,\n"
    " )\n"
    "\n"
    " // Non-streaming chat\n"
    " case api.chat(client, req) {\n"
    "   Ok(response) -> io.println(request.response_text(response))\n"
    "   Error(err) -> io.println(error.error_to_string(err))\n"
    " }\n"
    "\n"
    " // Streaming chat (batch mode - collects all events)\n"
    " case api.chat_stream(client, req) {\n"
    "   Ok(result) -> io.println(api.stream_text(result))\n"
    "   Error(err) -> io.println(error.error_to_string(err))\n"
    " }\n"
    " ```\n"
).

-type stream_result() :: {stream_result,
        list(anthropic@streaming:stream_event())}.

-type stream_error() :: {http_error, anthropic@error:anthropic_error()} |
    {sse_parse_error, binary()} |
    {event_decode_error, binary()} |
    {api_error, integer(), binary()}.

-file("src/anthropic/api.gleam", 86).
?DOC(" Parse a response body into CreateMessageResponse\n").
-spec parse_response(binary()) -> {ok,
        anthropic@request:create_message_response()} |
    {error, anthropic@error:anthropic_error()}.
parse_response(Body) ->
    anthropic@internal@decoder:parse_response_body(Body).

-file("src/anthropic/api.gleam", 119).
?DOC(
    " Send a chat message and receive a response (non-streaming)\n"
    "\n"
    " This is the primary function for interacting with Claude. It sends a message\n"
    " and returns the complete response.\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " import anthropic/api\n"
    " import anthropic/client\n"
    " import anthropic/types/request\n"
    " import anthropic/types/message.{user_message}\n"
    "\n"
    " let assert Ok(client) = client.init()\n"
    " let req = request.new(\n"
    "   \"claude-sonnet-4-20250514\",\n"
    "   [user_message(\"What is the capital of France?\")],\n"
    "   1024,\n"
    " )\n"
    "\n"
    " case api.chat(client, req) {\n"
    "   Ok(response) -> io.println(request.response_text(response))\n"
    "   Error(err) -> handle_error(err)\n"
    " }\n"
    " ```\n"
).
-spec chat(
    anthropic@client:client(),
    anthropic@request:create_message_request()
) -> {ok, anthropic@request:create_message_response()} |
    {error, anthropic@error:anthropic_error()}.
chat(Client, Message_request) ->
    gleam@result:'try'(
        anthropic@internal@validation:validate_request_or_error(Message_request),
        fun(_) ->
            Body = anthropic@request:request_to_json_string(Message_request),
            gleam@result:'try'(
                anthropic@client:post_and_handle(
                    Client,
                    <<"/v1/messages"/utf8>>,
                    Body
                ),
                fun(Response_body) -> parse_response(Response_body) end
            )
        end
    ).

-file("src/anthropic/api.gleam", 74).
?DOC(
    " Create a message using the Anthropic Messages API\n"
    "\n"
    " @deprecated Use `api.chat` instead for a more intuitive API\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " // Prefer using api.chat instead:\n"
    " case api.chat(client, request) {\n"
    "   Ok(response) -> io.println(response_text(response))\n"
    "   Error(err) -> io.println(error_to_string(err))\n"
    " }\n"
    " ```\n"
).
-spec create_message(
    anthropic@client:client(),
    anthropic@request:create_message_request()
) -> {ok, anthropic@request:create_message_response()} |
    {error, anthropic@error:anthropic_error()}.
create_message(Client, Message_request) ->
    chat(Client, Message_request).

-file("src/anthropic/api.gleam", 283).
?DOC(
    " Extract text from a single streaming event\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " list.each(result.events, fn(event) {\n"
    "   case api.event_text(event) {\n"
    "     Ok(text) -> io.print(text)\n"
    "     Error(_) -> Nil\n"
    "   }\n"
    " })\n"
    " ```\n"
).
-spec event_text(anthropic@streaming:stream_event()) -> {ok, binary()} |
    {error, nil}.
event_text(Event) ->
    case Event of
        {content_block_delta_event_variant, Delta_event} ->
            case erlang:element(3, Delta_event) of
                {text_content_delta, Text_delta} ->
                    {ok, erlang:element(2, Text_delta)};

                _ ->
                    {error, nil}
            end;

        _ ->
            {error, nil}
    end.

-file("src/anthropic/api.gleam", 265).
?DOC(
    " Get the full text from a streaming result\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " case api.chat_stream(client, request) {\n"
    "   Ok(result) -> io.println(api.stream_text(result))\n"
    "   Error(_) -> io.println(\"Error\")\n"
    " }\n"
    " ```\n"
).
-spec stream_text(stream_result()) -> binary().
stream_text(Result) ->
    _pipe = erlang:element(2, Result),
    _pipe@1 = gleam@list:filter_map(_pipe, fun event_text/1),
    gleam@string:join(_pipe@1, <<""/utf8>>).

-file("src/anthropic/api.gleam", 296).
?DOC(" Check if a streaming result completed successfully\n").
-spec stream_complete(stream_result()) -> boolean().
stream_complete(Result) ->
    gleam@list:any(erlang:element(2, Result), fun(Event) -> case Event of
                message_stop_event ->
                    true;

                _ ->
                    false
            end end).

-file("src/anthropic/api.gleam", 306).
?DOC(" Check if a streaming result contains an error\n").
-spec stream_has_error(stream_result()) -> boolean().
stream_has_error(Result) ->
    gleam@list:any(erlang:element(2, Result), fun(Event) -> case Event of
                {error_event, _} ->
                    true;

                _ ->
                    false
            end end).

-file("src/anthropic/api.gleam", 316).
?DOC(" Get the message ID from a streaming result\n").
-spec stream_message_id(stream_result()) -> {ok, binary()} | {error, nil}.
stream_message_id(Result) ->
    _pipe = erlang:element(2, Result),
    gleam@list:find_map(_pipe, fun(Event) -> case Event of
                {message_start_event, Msg} ->
                    {ok, erlang:element(2, Msg)};

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

-file("src/anthropic/api.gleam", 327).
?DOC(" Get the model from a streaming result\n").
-spec stream_model(stream_result()) -> {ok, binary()} | {error, nil}.
stream_model(Result) ->
    _pipe = erlang:element(2, Result),
    gleam@list:find_map(_pipe, fun(Event) -> case Event of
                {message_start_event, Msg} ->
                    {ok, erlang:element(5, Msg)};

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

-file("src/anthropic/api.gleam", 342).
?DOC(" Parse SSE body text into streaming events\n").
-spec parse_sse_body(binary()) -> {ok, stream_result()} |
    {error, stream_error()}.
parse_sse_body(Body) ->
    State = anthropic@internal@sse:new_parser_state(),
    Parse_result = anthropic@internal@sse:parse_chunk(State, Body),
    Events = begin
        _pipe = erlang:element(2, Parse_result),
        gleam@list:filter_map(
            _pipe,
            fun(Sse_event) ->
                case anthropic@streaming@decoder:decode_event(Sse_event) of
                    {ok, Event} ->
                        {ok, Event};

                    {error, _} ->
                        {error, nil}
                end
            end
        )
    end,
    Remaining_events = case anthropic@internal@sse:flush(
        erlang:element(3, Parse_result)
    ) of
        {ok, Sse_event@1} ->
            case anthropic@streaming@decoder:decode_event(Sse_event@1) of
                {ok, Event@1} ->
                    [Event@1];

                {error, _} ->
                    []
            end;

        {error, _} ->
            []
    end,
    {ok, {stream_result, lists:append(Events, Remaining_events)}}.

-file("src/anthropic/api.gleam", 422).
?DOC(" Convert ConnectError to string\n").
-spec connect_error_to_string(gleam@httpc:connect_error()) -> binary().
connect_error_to_string(Err) ->
    case Err of
        {posix, Code} ->
            <<"POSIX error: "/utf8, Code/binary>>;

        {tls_alert, Code@1, Detail} ->
            <<<<<<"TLS alert "/utf8, Code@1/binary>>/binary, ": "/utf8>>/binary,
                Detail/binary>>
    end.

-file("src/anthropic/api.gleam", 406).
?DOC(" Convert httpc error to AnthropicError\n").
-spec http_error_to_anthropic_error(gleam@httpc:http_error()) -> anthropic@error:anthropic_error().
http_error_to_anthropic_error(Err) ->
    case Err of
        invalid_utf8_response ->
            anthropic@error:http_error(<<"Invalid UTF-8 in response"/utf8>>);

        {failed_to_connect, Ip4, Ip6} ->
            anthropic@error:network_error(
                <<<<<<<<"Failed to connect to server (IPv4: "/utf8,
                                (connect_error_to_string(Ip4))/binary>>/binary,
                            ", IPv6: "/utf8>>/binary,
                        (connect_error_to_string(Ip6))/binary>>/binary,
                    ")"/utf8>>
            );

        response_timeout ->
            anthropic@error:timeout_error(0)
    end.

-file("src/anthropic/api.gleam", 370).
?DOC(" Make a streaming HTTP request using gleam_httpc\n").
-spec make_streaming_request(anthropic@client:client(), binary()) -> {ok,
        gleam@http@response:response(binary())} |
    {error, anthropic@error:anthropic_error()}.
make_streaming_request(Api_client, Body) ->
    Base_url = erlang:element(3, erlang:element(2, Api_client)),
    Full_url = <<Base_url/binary, "/v1/messages"/utf8>>,
    gleam@result:'try'(
        begin
            _pipe = gleam@http@request:to(Full_url),
            gleam@result:map_error(
                _pipe,
                fun(_) ->
                    anthropic@error:config_error(
                        <<"Invalid URL: "/utf8, Full_url/binary>>
                    )
                end
            )
        end,
        fun(Req) ->
            Req@1 = begin
                _pipe@1 = Req,
                _pipe@2 = gleam@http@request:set_method(_pipe@1, post),
                _pipe@3 = gleam@http@request:set_header(
                    _pipe@2,
                    <<"content-type"/utf8>>,
                    <<"application/json"/utf8>>
                ),
                _pipe@4 = gleam@http@request:set_header(
                    _pipe@3,
                    <<"x-api-key"/utf8>>,
                    anthropic@config:api_key_to_string(
                        erlang:element(2, erlang:element(2, Api_client))
                    )
                ),
                _pipe@5 = gleam@http@request:set_header(
                    _pipe@4,
                    <<"anthropic-version"/utf8>>,
                    <<"2023-06-01"/utf8>>
                ),
                _pipe@6 = gleam@http@request:set_header(
                    _pipe@5,
                    <<"accept"/utf8>>,
                    <<"text/event-stream"/utf8>>
                ),
                gleam@http@request:set_body(_pipe@6, Body)
            end,
            _pipe@7 = gleam@httpc:configure(),
            _pipe@8 = gleam@httpc:timeout(
                _pipe@7,
                erlang:element(5, erlang:element(2, Api_client))
            ),
            _pipe@9 = gleam@httpc:dispatch(_pipe@8, Req@1),
            gleam@result:map_error(
                _pipe@9,
                fun(Err) -> http_error_to_anthropic_error(Err) end
            )
        end
    ).

-file("src/anthropic/api.gleam", 190).
?DOC(
    " Send a chat message with streaming response (batch mode)\n"
    "\n"
    " This function sends a message and returns all streaming events after\n"
    " the response completes. For true real-time streaming, use the sans-io\n"
    " functions in `anthropic/streaming/handler`.\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " import anthropic/api\n"
    " import anthropic/client\n"
    " import anthropic/types/request\n"
    " import anthropic/types/message.{user_message}\n"
    "\n"
    " let assert Ok(client) = client.init()\n"
    " let req = request.new(\n"
    "   \"claude-sonnet-4-20250514\",\n"
    "   [user_message(\"Tell me a story\")],\n"
    "   2048,\n"
    " )\n"
    "\n"
    " case api.chat_stream(client, req) {\n"
    "   Ok(result) -> io.println(api.stream_text(result))\n"
    "   Error(err) -> handle_stream_error(err)\n"
    " }\n"
    " ```\n"
).
-spec chat_stream(
    anthropic@client:client(),
    anthropic@request:create_message_request()
) -> {ok, stream_result()} | {error, stream_error()}.
chat_stream(Client, Message_request) ->
    Streaming_request = anthropic@request:with_stream(Message_request, true),
    case anthropic@internal@validation:validate_request_or_error(
        Streaming_request
    ) of
        {error, Err} ->
            {error, {http_error, Err}};

        {ok, _} ->
            Body = anthropic@request:request_to_json_string(Streaming_request),
            case make_streaming_request(Client, Body) of
                {error, Err@1} ->
                    {error, {http_error, Err@1}};

                {ok, Http_response} ->
                    case erlang:element(2, Http_response) of
                        200 ->
                            parse_sse_body(erlang:element(4, Http_response));

                        Status ->
                            {error,
                                {api_error,
                                    Status,
                                    erlang:element(4, Http_response)}}
                    end
            end
    end.

-file("src/anthropic/api.gleam", 238).
?DOC(
    " Send a streaming chat message with a callback for each event\n"
    "\n"
    " **Note**: Despite the callback, this function collects ALL events before\n"
    " calling the callbacks. It does NOT provide true real-time streaming.\n"
    " For real-time streaming, use the sans-io functions in `anthropic/streaming/handler`.\n"
    "\n"
    " ## Example\n"
    "\n"
    " ```gleam\n"
    " api.chat_stream_with_callback(client, request, fn(event) {\n"
    "   case api.event_text(event) {\n"
    "     Ok(text) -> io.print(text)\n"
    "     Error(_) -> Nil\n"
    "   }\n"
    " })\n"
    " ```\n"
).
-spec chat_stream_with_callback(
    anthropic@client:client(),
    anthropic@request:create_message_request(),
    fun((anthropic@streaming:stream_event()) -> nil)
) -> {ok, stream_result()} | {error, stream_error()}.
chat_stream_with_callback(Client, Message_request, Callback) ->
    gleam@result:'try'(
        chat_stream(Client, Message_request),
        fun(Stream_result) ->
            gleam@list:each(erlang:element(2, Stream_result), Callback),
            {ok, Stream_result}
        end
    ).