-module(anthropic@streaming@decoder).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/anthropic/streaming/decoder.gleam").
-export([decode_event/1]).
-export_type([decode_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(
    " JSON decoder for streaming events\n"
    "\n"
    " This module decodes JSON data from SSE events into typed StreamEvent values.\n"
    " It handles all Anthropic streaming event types including message_start,\n"
    " content_block_start, content_block_delta, content_block_stop,\n"
    " message_delta, message_stop, ping, and error events.\n"
).

-type decode_error() :: {json_parse_error, binary()} |
    {unknown_event_type, binary()} |
    {missing_field, binary()} |
    {invalid_field_value, binary(), binary()}.

-file("src/anthropic/streaming/decoder.gleam", 152).
?DOC(" Decoder for content block in content_block_start\n").
-spec content_block_start_decoder() -> gleam@dynamic@decode:decoder(anthropic@message:content_block()).
content_block_start_decoder() ->
    gleam@dynamic@decode:field(
        <<"type"/utf8>>,
        {decoder, fun gleam@dynamic@decode:decode_string/1},
        fun(Block_type) -> case Block_type of
                <<"text"/utf8>> ->
                    gleam@dynamic@decode:optional_field(
                        <<"text"/utf8>>,
                        <<""/utf8>>,
                        {decoder, fun gleam@dynamic@decode:decode_string/1},
                        fun(Text) ->
                            gleam@dynamic@decode:success({text_block, Text})
                        end
                    );

                <<"tool_use"/utf8>> ->
                    gleam@dynamic@decode:field(
                        <<"id"/utf8>>,
                        {decoder, fun gleam@dynamic@decode:decode_string/1},
                        fun(Id) ->
                            gleam@dynamic@decode:field(
                                <<"name"/utf8>>,
                                {decoder,
                                    fun gleam@dynamic@decode:decode_string/1},
                                fun(Name) ->
                                    gleam@dynamic@decode:success(
                                        {tool_use_block, Id, Name, <<""/utf8>>}
                                    )
                                end
                            )
                        end
                    );

                _ ->
                    gleam@dynamic@decode:success({text_block, <<""/utf8>>})
            end end
    ).

-file("src/anthropic/streaming/decoder.gleam", 195).
?DOC(" Decoder for delta content\n").
-spec delta_decoder() -> gleam@dynamic@decode:decoder(anthropic@streaming:content_block_delta()).
delta_decoder() ->
    gleam@dynamic@decode:field(
        <<"type"/utf8>>,
        {decoder, fun gleam@dynamic@decode:decode_string/1},
        fun(Delta_type) -> case Delta_type of
                <<"text_delta"/utf8>> ->
                    gleam@dynamic@decode:field(
                        <<"text"/utf8>>,
                        {decoder, fun gleam@dynamic@decode:decode_string/1},
                        fun(Text) ->
                            gleam@dynamic@decode:success(
                                {text_content_delta, {text_delta, Text}}
                            )
                        end
                    );

                <<"input_json_delta"/utf8>> ->
                    gleam@dynamic@decode:field(
                        <<"partial_json"/utf8>>,
                        {decoder, fun gleam@dynamic@decode:decode_string/1},
                        fun(Partial_json) ->
                            gleam@dynamic@decode:success(
                                {input_json_content_delta,
                                    {input_json_delta, Partial_json}}
                            )
                        end
                    );

                _ ->
                    gleam@dynamic@decode:success(
                        {text_content_delta, {text_delta, <<""/utf8>>}}
                    )
            end end
    ).

-file("src/anthropic/streaming/decoder.gleam", 275).
?DOC(" Decoder for message delta usage\n").
-spec message_delta_usage_decoder() -> gleam@dynamic@decode:decoder(anthropic@streaming:message_delta_usage()).
message_delta_usage_decoder() ->
    gleam@dynamic@decode:field(
        <<"output_tokens"/utf8>>,
        {decoder, fun gleam@dynamic@decode:decode_int/1},
        fun(Output_tokens) ->
            gleam@dynamic@decode:success({message_delta_usage, Output_tokens})
        end
    ).

-file("src/anthropic/streaming/decoder.gleam", 295).
?DOC(" Decoder for error inner content\n").
-spec error_inner_decoder() -> gleam@dynamic@decode:decoder(anthropic@streaming:stream_error()).
error_inner_decoder() ->
    gleam@dynamic@decode:field(
        <<"type"/utf8>>,
        {decoder, fun gleam@dynamic@decode:decode_string/1},
        fun(Error_type) ->
            gleam@dynamic@decode:field(
                <<"message"/utf8>>,
                {decoder, fun gleam@dynamic@decode:decode_string/1},
                fun(Message) ->
                    gleam@dynamic@decode:success(
                        {stream_error, Error_type, Message}
                    )
                end
            )
        end
    ).

-file("src/anthropic/streaming/decoder.gleam", 306).
?DOC(" Decoder for Usage\n").
-spec usage_decoder() -> gleam@dynamic@decode:decoder(anthropic@request:usage()).
usage_decoder() ->
    gleam@dynamic@decode:field(
        <<"input_tokens"/utf8>>,
        {decoder, fun gleam@dynamic@decode:decode_int/1},
        fun(Input_tokens) ->
            gleam@dynamic@decode:optional_field(
                <<"output_tokens"/utf8>>,
                0,
                {decoder, fun gleam@dynamic@decode:decode_int/1},
                fun(Output_tokens) ->
                    gleam@dynamic@decode:success(
                        {usage, Input_tokens, Output_tokens}
                    )
                end
            )
        end
    ).

-file("src/anthropic/streaming/decoder.gleam", 320).
?DOC(" Parse role from string\n").
-spec parse_role(binary()) -> anthropic@message:role().
parse_role(Str) ->
    case Str of
        <<"assistant"/utf8>> ->
            assistant;

        _ ->
            assistant
    end.

-file("src/anthropic/streaming/decoder.gleam", 107).
?DOC(" Decoder for MessageStart within the message field\n").
-spec message_start_decoder() -> gleam@dynamic@decode:decoder(anthropic@streaming:message_start()).
message_start_decoder() ->
    gleam@dynamic@decode:field(
        <<"id"/utf8>>,
        {decoder, fun gleam@dynamic@decode:decode_string/1},
        fun(Id) ->
            gleam@dynamic@decode:field(
                <<"type"/utf8>>,
                {decoder, fun gleam@dynamic@decode:decode_string/1},
                fun(Message_type) ->
                    gleam@dynamic@decode:field(
                        <<"role"/utf8>>,
                        {decoder, fun gleam@dynamic@decode:decode_string/1},
                        fun(Role_str) ->
                            gleam@dynamic@decode:field(
                                <<"model"/utf8>>,
                                {decoder,
                                    fun gleam@dynamic@decode:decode_string/1},
                                fun(Model) ->
                                    gleam@dynamic@decode:field(
                                        <<"usage"/utf8>>,
                                        usage_decoder(),
                                        fun(Usage) ->
                                            Role = parse_role(Role_str),
                                            gleam@dynamic@decode:success(
                                                {message_start,
                                                    Id,
                                                    Message_type,
                                                    Role,
                                                    Model,
                                                    Usage}
                                            )
                                        end
                                    )
                                end
                            )
                        end
                    )
                end
            )
        end
    ).

-file("src/anthropic/streaming/decoder.gleam", 328).
?DOC(" Parse stop reason from string\n").
-spec parse_stop_reason(binary()) -> gleam@option:option(anthropic@request:stop_reason()).
parse_stop_reason(Str) ->
    case Str of
        <<"end_turn"/utf8>> ->
            {some, end_turn};

        <<"max_tokens"/utf8>> ->
            {some, max_tokens};

        <<"stop_sequence"/utf8>> ->
            {some, stop_sequence};

        <<"tool_use"/utf8>> ->
            {some, tool_use};

        _ ->
            none
    end.

-file("src/anthropic/streaming/decoder.gleam", 256).
?DOC(" Decoder for message delta inner content\n").
-spec message_delta_inner_decoder() -> gleam@dynamic@decode:decoder(anthropic@streaming:message_delta()).
message_delta_inner_decoder() ->
    gleam@dynamic@decode:optional_field(
        <<"stop_reason"/utf8>>,
        none,
        begin
            _pipe = {decoder, fun gleam@dynamic@decode:decode_string/1},
            gleam@dynamic@decode:map(_pipe, fun(S) -> parse_stop_reason(S) end)
        end,
        fun(Stop_reason) ->
            gleam@dynamic@decode:optional_field(
                <<"stop_sequence"/utf8>>,
                none,
                begin
                    _pipe@1 = {decoder,
                        fun gleam@dynamic@decode:decode_string/1},
                    gleam@dynamic@decode:map(
                        _pipe@1,
                        fun(Field@0) -> {some, Field@0} end
                    )
                end,
                fun(Stop_sequence) ->
                    gleam@dynamic@decode:success(
                        {message_delta, Stop_reason, Stop_sequence}
                    )
                end
            )
        end
    ).

-file("src/anthropic/streaming/decoder.gleam", 339).
?DOC(" Format decode errors to string\n").
-spec format_errors(list(gleam@dynamic@decode:decode_error())) -> binary().
format_errors(Errors) ->
    _pipe = Errors,
    _pipe@1 = gleam@list:map(
        _pipe,
        fun(E) ->
            <<<<<<"expected "/utf8, (erlang:element(2, E))/binary>>/binary,
                    ", got "/utf8>>/binary,
                (erlang:element(3, E))/binary>>
        end
    ),
    gleam@string:join(_pipe@1, <<"; "/utf8>>).

-file("src/anthropic/streaming/decoder.gleam", 91).
?DOC(" Decode a message_start event\n").
-spec decode_message_start(gleam@dynamic:dynamic_()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_message_start(Json) ->
    Decoder = begin
        gleam@dynamic@decode:field(
            <<"message"/utf8>>,
            message_start_decoder(),
            fun(Message) -> gleam@dynamic@decode:success(Message) end
        )
    end,
    case gleam@dynamic@decode:run(Json, Decoder) of
        {ok, Msg} ->
            {ok, {message_start_event, Msg}};

        {error, Errors} ->
            {error,
                {json_parse_error,
                    <<"Failed to decode message_start: "/utf8,
                        (format_errors(Errors))/binary>>}}
    end.

-file("src/anthropic/streaming/decoder.gleam", 126).
?DOC(" Decode a content_block_start event\n").
-spec decode_content_block_start(gleam@dynamic:dynamic_()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_content_block_start(Json) ->
    Decoder = begin
        gleam@dynamic@decode:field(
            <<"index"/utf8>>,
            {decoder, fun gleam@dynamic@decode:decode_int/1},
            fun(Index) ->
                gleam@dynamic@decode:field(
                    <<"content_block"/utf8>>,
                    content_block_start_decoder(),
                    fun(Content_block) ->
                        gleam@dynamic@decode:success({Index, Content_block})
                    end
                )
            end
        )
    end,
    case gleam@dynamic@decode:run(Json, Decoder) of
        {ok, {Index@1, Block}} ->
            {ok,
                {content_block_start_event,
                    {content_block_start, Index@1, Block}}};

        {error, Errors} ->
            {error,
                {json_parse_error,
                    <<"Failed to decode content_block_start: "/utf8,
                        (format_errors(Errors))/binary>>}}
    end.

-file("src/anthropic/streaming/decoder.gleam", 170).
?DOC(" Decode a content_block_delta event\n").
-spec decode_content_block_delta(gleam@dynamic:dynamic_()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_content_block_delta(Json) ->
    Decoder = begin
        gleam@dynamic@decode:field(
            <<"index"/utf8>>,
            {decoder, fun gleam@dynamic@decode:decode_int/1},
            fun(Index) ->
                gleam@dynamic@decode:field(
                    <<"delta"/utf8>>,
                    delta_decoder(),
                    fun(Delta) ->
                        gleam@dynamic@decode:success({Index, Delta})
                    end
                )
            end
        )
    end,
    case gleam@dynamic@decode:run(Json, Decoder) of
        {ok, {Index@1, Delta@1}} ->
            {ok,
                {content_block_delta_event_variant,
                    {content_block_delta_event, Index@1, Delta@1}}};

        {error, Errors} ->
            {error,
                {json_parse_error,
                    <<"Failed to decode content_block_delta: "/utf8,
                        (format_errors(Errors))/binary>>}}
    end.

-file("src/anthropic/streaming/decoder.gleam", 214).
?DOC(" Decode a content_block_stop event\n").
-spec decode_content_block_stop(gleam@dynamic:dynamic_()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_content_block_stop(Json) ->
    Decoder = begin
        gleam@dynamic@decode:field(
            <<"index"/utf8>>,
            {decoder, fun gleam@dynamic@decode:decode_int/1},
            fun(Index) -> gleam@dynamic@decode:success(Index) end
        )
    end,
    case gleam@dynamic@decode:run(Json, Decoder) of
        {ok, Index@1} ->
            {ok, {content_block_stop_event, {content_block_stop, Index@1}}};

        {error, Errors} ->
            {error,
                {json_parse_error,
                    <<"Failed to decode content_block_stop: "/utf8,
                        (format_errors(Errors))/binary>>}}
    end.

-file("src/anthropic/streaming/decoder.gleam", 233).
?DOC(" Decode a message_delta event\n").
-spec decode_message_delta(gleam@dynamic:dynamic_()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_message_delta(Json) ->
    Decoder = begin
        gleam@dynamic@decode:field(
            <<"delta"/utf8>>,
            message_delta_inner_decoder(),
            fun(Delta) ->
                gleam@dynamic@decode:field(
                    <<"usage"/utf8>>,
                    message_delta_usage_decoder(),
                    fun(Usage) ->
                        gleam@dynamic@decode:success({Delta, Usage})
                    end
                )
            end
        )
    end,
    case gleam@dynamic@decode:run(Json, Decoder) of
        {ok, {Delta@1, Usage@1}} ->
            {ok,
                {message_delta_event_variant,
                    {message_delta_event, Delta@1, Usage@1}}};

        {error, Errors} ->
            {error,
                {json_parse_error,
                    <<"Failed to decode message_delta: "/utf8,
                        (format_errors(Errors))/binary>>}}
    end.

-file("src/anthropic/streaming/decoder.gleam", 281).
?DOC(" Decode an error event\n").
-spec decode_error(gleam@dynamic:dynamic_()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_error(Json) ->
    Decoder = begin
        gleam@dynamic@decode:field(
            <<"error"/utf8>>,
            error_inner_decoder(),
            fun(Error) -> gleam@dynamic@decode:success(Error) end
        )
    end,
    case gleam@dynamic@decode:run(Json, Decoder) of
        {ok, Error@1} ->
            {ok, {error_event, Error@1}};

        {error, Errors} ->
            {error,
                {json_parse_error,
                    <<"Failed to decode error: "/utf8,
                        (format_errors(Errors))/binary>>}}
    end.

-file("src/anthropic/streaming/decoder.gleam", 71).
?DOC(" Decode a typed event from parsed JSON\n").
-spec decode_typed_event(binary(), gleam@dynamic:dynamic_()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_typed_event(Event_type, Json) ->
    case Event_type of
        <<"message_start"/utf8>> ->
            decode_message_start(Json);

        <<"content_block_start"/utf8>> ->
            decode_content_block_start(Json);

        <<"content_block_delta"/utf8>> ->
            decode_content_block_delta(Json);

        <<"content_block_stop"/utf8>> ->
            decode_content_block_stop(Json);

        <<"message_delta"/utf8>> ->
            decode_message_delta(Json);

        <<"error"/utf8>> ->
            decode_error(Json);

        _ ->
            {error, {unknown_event_type, Event_type}}
    end.

-file("src/anthropic/streaming/decoder.gleam", 60).
?DOC(" Decode an event that has JSON data\n").
-spec decode_data_event(binary(), binary()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_data_event(Event_type, Data) ->
    case gleam_json_ffi:decode(Data) of
        {error, _} ->
            {error,
                {json_parse_error,
                    <<"Failed to parse JSON: "/utf8, Data/binary>>}};

        {ok, Json} ->
            decode_typed_event(Event_type, Json)
    end.

-file("src/anthropic/streaming/decoder.gleam", 49).
?DOC(" Decode an SSE event into a StreamEvent\n").
-spec decode_event(anthropic@internal@sse:sse_event()) -> {ok,
        anthropic@streaming:stream_event()} |
    {error, decode_error()}.
decode_event(Sse_event) ->
    Event_type = anthropic@internal@sse:get_event_type(Sse_event),
    case Event_type of
        <<"ping"/utf8>> ->
            {ok, ping_event};

        <<"message_stop"/utf8>> ->
            {ok, message_stop_event};

        _ ->
            decode_data_event(
                Event_type,
                anthropic@internal@sse:get_data(Sse_event)
            )
    end.