-module(glean@provider).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/glean/provider.gleam").
-export([default_settings/0, result_text/1, result_tool_calls/1]).
-export_type([provider/0, generate_request/0, generate_result/0, generated_content/0, model_settings/0, tool_spec/0, tool_choice/0, response_format/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.

-type provider() :: {provider,
        binary(),
        binary(),
        fun((generate_request()) -> {ok, generate_result()} |
            {error, glean@error:glean_error()}),
        fun((generate_request(), fun((glean@stream:stream_event()) -> nil)) -> {ok,
                generate_result()} |
            {error, glean@error:glean_error()})}.

-type generate_request() :: {generate_request,
        list(glean@message:message()),
        model_settings(),
        list(tool_spec()),
        tool_choice(),
        response_format()}.

-type generate_result() :: {generate_result,
        list(generated_content()),
        glean@error:finish_reason(),
        glean@stream:usage(),
        binary()}.

-type generated_content() :: {generated_text, binary()} |
    {generated_reasoning, binary()} |
    {generated_tool_call, binary(), binary(), binary()}.

-type model_settings() :: {model_settings,
        gleam@option:option(integer()),
        gleam@option:option(float()),
        gleam@option:option(float()),
        gleam@option:option(integer()),
        gleam@option:option(list(binary())),
        gleam@option:option(integer()),
        gleam@option:option(float()),
        gleam@option:option(float())}.

-type tool_spec() :: {tool_spec, binary(), binary(), glean@schema:schema()}.

-type tool_choice() :: auto | required | no_tools | {specific_tool, binary()}.

-type response_format() :: text_format |
    {json_format,
        gleam@option:option(glean@schema:schema()),
        gleam@option:option(binary())}.

-file("src/glean/provider.gleam", 96).
?DOC(" Default model settings (all None — provider uses its defaults).\n").
-spec default_settings() -> model_settings().
default_settings() ->
    {model_settings, none, none, none, none, none, none, none, none}.

-file("src/glean/provider.gleam", 115).
-spec collect_text_content(list(generated_content()), binary()) -> binary().
collect_text_content(Content, Acc) ->
    case Content of
        [] ->
            Acc;

        [{generated_text, Text} | Rest] ->
            collect_text_content(Rest, <<Acc/binary, Text/binary>>);

        [_ | Rest@1] ->
            collect_text_content(Rest@1, Acc)
    end.

-file("src/glean/provider.gleam", 110).
?DOC(" Extract all text content from a generate result.\n").
-spec result_text(generate_result()) -> binary().
result_text(Result) ->
    _pipe = erlang:element(2, Result),
    collect_text_content(_pipe, <<""/utf8>>).

-file("src/glean/provider.gleam", 131).
-spec collect_tool_call_content(
    list(generated_content()),
    list({binary(), binary(), binary()})
) -> list({binary(), binary(), binary()}).
collect_tool_call_content(Content, Acc) ->
    case Content of
        [] ->
            lists:reverse(Acc);

        [{generated_tool_call, Id, Name, Args} | Rest] ->
            collect_tool_call_content(Rest, [{Id, Name, Args} | Acc]);

        [_ | Rest@1] ->
            collect_tool_call_content(Rest@1, Acc)
    end.

-file("src/glean/provider.gleam", 124).
?DOC(" Extract tool calls from generated content.\n").
-spec result_tool_calls(generate_result()) -> list({binary(),
    binary(),
    binary()}).
result_tool_calls(Result) ->
    _pipe = erlang:element(2, Result),
    collect_tool_call_content(_pipe, []).