-module(pig@agent@state).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/pig/agent/state.gleam").
-export([config/1, with_tools/2, with_system_prompt/2, with_max_iterations/2, with_model/2, with_agent_id/2, with_agent_name/2, with_agent_description/2, with_agent_version/2, with_provider_name/2, with_session_path/2, new/1, config_put_provider/2, add_message/2, history/1, increment_iterations/1, exceeded_max_iterations/1, tool_definitions/1, messages_for_provider/1, max_iterations_error/1]).
-export_type([agent_config/0, agent_state/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(
    " Agent state types and configuration.\n"
    "\n"
    " `AgentConfig` holds the immutable configuration for creating an agent.\n"
    " `AgentState` holds the runtime state (history, iterations).\n"
    " State is immutable — every mutation returns a new state.\n"
    "\n"
    " Note: hooks and dispatcher are runtime concerns, stored on\n"
    " `PigConfig` / `RuntimeConfig`, not here. The pure core (`update.gleam`)\n"
    " has no knowledge of hooks or the dispatcher.\n"
).

-type agent_config() :: {agent_config,
        fun((list(pig_protocol@message:message()), list(pig_protocol@tool_definition:tool_definition())) -> {ok,
                pig_protocol@inference:inference_result()} |
            {error, pig_protocol@error:ai_error()}),
        pig@tool:tool_registry(),
        gleam@option:option(binary()),
        integer(),
        binary(),
        gleam@option:option(binary()),
        gleam@option:option(binary()),
        gleam@option:option(binary()),
        gleam@option:option(binary()),
        gleam@option:option(binary()),
        gleam@option:option(binary())}.

-type agent_state() :: {agent_state,
        agent_config(),
        list(pig_protocol@message:message()),
        integer()}.

-file("src/pig/agent/state.gleam", 48).
?DOC(" Create an AgentConfig with defaults.\n").
-spec config(
    fun((list(pig_protocol@message:message()), list(pig_protocol@tool_definition:tool_definition())) -> {ok,
            pig_protocol@inference:inference_result()} |
        {error, pig_protocol@error:ai_error()})
) -> agent_config().
config(Provider) ->
    {agent_config,
        Provider,
        pig@tool:new_registry(),
        none,
        50,
        <<"unknown"/utf8>>,
        none,
        none,
        none,
        none,
        none,
        none}.

-file("src/pig/agent/state.gleam", 65).
?DOC(" Set the tool registry on the config.\n").
-spec with_tools(agent_config(), pig@tool:tool_registry()) -> agent_config().
with_tools(Config, Tools) ->
    {agent_config,
        erlang:element(2, Config),
        Tools,
        erlang:element(4, Config),
        erlang:element(5, Config),
        erlang:element(6, Config),
        erlang:element(7, Config),
        erlang:element(8, Config),
        erlang:element(9, Config),
        erlang:element(10, Config),
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 70).
?DOC(" Set the system prompt on the config.\n").
-spec with_system_prompt(agent_config(), binary()) -> agent_config().
with_system_prompt(Config, Prompt) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        {some, Prompt},
        erlang:element(5, Config),
        erlang:element(6, Config),
        erlang:element(7, Config),
        erlang:element(8, Config),
        erlang:element(9, Config),
        erlang:element(10, Config),
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 75).
?DOC(" Set the maximum number of loop iterations before forcing termination.\n").
-spec with_max_iterations(agent_config(), integer()) -> agent_config().
with_max_iterations(Config, Max) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        Max,
        erlang:element(6, Config),
        erlang:element(7, Config),
        erlang:element(8, Config),
        erlang:element(9, Config),
        erlang:element(10, Config),
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 80).
?DOC(" Set the model name for telemetry and logging.\n").
-spec with_model(agent_config(), binary()) -> agent_config().
with_model(Config, Model) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        erlang:element(5, Config),
        Model,
        erlang:element(7, Config),
        erlang:element(8, Config),
        erlang:element(9, Config),
        erlang:element(10, Config),
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 85).
?DOC(" Set the agent ID.\n").
-spec with_agent_id(agent_config(), binary()) -> agent_config().
with_agent_id(Config, Id) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        erlang:element(5, Config),
        erlang:element(6, Config),
        {some, Id},
        erlang:element(8, Config),
        erlang:element(9, Config),
        erlang:element(10, Config),
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 90).
?DOC(" Set the agent name.\n").
-spec with_agent_name(agent_config(), binary()) -> agent_config().
with_agent_name(Config, Name) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        erlang:element(5, Config),
        erlang:element(6, Config),
        erlang:element(7, Config),
        {some, Name},
        erlang:element(9, Config),
        erlang:element(10, Config),
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 95).
?DOC(" Set the agent description.\n").
-spec with_agent_description(agent_config(), binary()) -> agent_config().
with_agent_description(Config, Desc) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        erlang:element(5, Config),
        erlang:element(6, Config),
        erlang:element(7, Config),
        erlang:element(8, Config),
        {some, Desc},
        erlang:element(10, Config),
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 103).
?DOC(" Set the agent version.\n").
-spec with_agent_version(agent_config(), binary()) -> agent_config().
with_agent_version(Config, Version) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        erlang:element(5, Config),
        erlang:element(6, Config),
        erlang:element(7, Config),
        erlang:element(8, Config),
        erlang:element(9, Config),
        {some, Version},
        erlang:element(11, Config),
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 108).
?DOC(" Set the provider name.\n").
-spec with_provider_name(agent_config(), binary()) -> agent_config().
with_provider_name(Config, Name) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        erlang:element(5, Config),
        erlang:element(6, Config),
        erlang:element(7, Config),
        erlang:element(8, Config),
        erlang:element(9, Config),
        erlang:element(10, Config),
        {some, Name},
        erlang:element(12, Config)}.

-file("src/pig/agent/state.gleam", 113).
?DOC(" Set the session path for persistence and replay.\n").
-spec with_session_path(agent_config(), binary()) -> agent_config().
with_session_path(Config, Path) ->
    {agent_config,
        erlang:element(2, Config),
        erlang:element(3, Config),
        erlang:element(4, Config),
        erlang:element(5, Config),
        erlang:element(6, Config),
        erlang:element(7, Config),
        erlang:element(8, Config),
        erlang:element(9, Config),
        erlang:element(10, Config),
        erlang:element(11, Config),
        {some, Path}}.

-file("src/pig/agent/state.gleam", 118).
?DOC(" Create initial agent state from config.\n").
-spec new(agent_config()) -> agent_state().
new(Config) ->
    {agent_state, Config, [], 0}.

-file("src/pig/agent/state.gleam", 123).
?DOC(" Replace the provider on an existing state.\n").
-spec config_put_provider(
    agent_state(),
    fun((list(pig_protocol@message:message()), list(pig_protocol@tool_definition:tool_definition())) -> {ok,
            pig_protocol@inference:inference_result()} |
        {error, pig_protocol@error:ai_error()})
) -> agent_state().
config_put_provider(St, Provider) ->
    {agent_state,
        begin
            _record = erlang:element(2, St),
            {agent_config,
                Provider,
                erlang:element(3, _record),
                erlang:element(4, _record),
                erlang:element(5, _record),
                erlang:element(6, _record),
                erlang:element(7, _record),
                erlang:element(8, _record),
                erlang:element(9, _record),
                erlang:element(10, _record),
                erlang:element(11, _record),
                erlang:element(12, _record)}
        end,
        erlang:element(3, St),
        erlang:element(4, St)}.

-file("src/pig/agent/state.gleam", 132).
?DOC(" Add a message to the end of history. Returns new state.\n").
-spec add_message(agent_state(), pig_protocol@message:message()) -> agent_state().
add_message(State, Msg) ->
    {agent_state,
        erlang:element(2, State),
        lists:append(erlang:element(3, State), [Msg]),
        erlang:element(4, State)}.

-file("src/pig/agent/state.gleam", 137).
?DOC(" Get the conversation history in order.\n").
-spec history(agent_state()) -> list(pig_protocol@message:message()).
history(State) ->
    erlang:element(3, State).

-file("src/pig/agent/state.gleam", 142).
?DOC(" Increment the iteration counter. Returns new state.\n").
-spec increment_iterations(agent_state()) -> agent_state().
increment_iterations(State) ->
    {agent_state,
        erlang:element(2, State),
        erlang:element(3, State),
        erlang:element(4, State) + 1}.

-file("src/pig/agent/state.gleam", 147).
?DOC(" Check if the agent has exceeded its maximum iterations.\n").
-spec exceeded_max_iterations(agent_state()) -> boolean().
exceeded_max_iterations(State) ->
    erlang:element(4, State) >= erlang:element(5, erlang:element(2, State)).

-file("src/pig/agent/state.gleam", 152).
?DOC(" Get tool definitions from the registry.\n").
-spec tool_definitions(agent_state()) -> list(pig_protocol@tool_definition:tool_definition()).
tool_definitions(State) ->
    pig@tool:list_definitions(erlang:element(3, erlang:element(2, State))).

-file("src/pig/agent/state.gleam", 159).
?DOC(
    " Get messages for a provider call.\n"
    "\n"
    " Prepends the system prompt as a `System` message if one is configured.\n"
).
-spec messages_for_provider(agent_state()) -> list(pig_protocol@message:message()).
messages_for_provider(State) ->
    case erlang:element(4, erlang:element(2, State)) of
        {some, Prompt} ->
            [{system, Prompt} | erlang:element(3, State)];

        none ->
            erlang:element(3, State)
    end.

-file("src/pig/agent/state.gleam", 167).
?DOC(" Build an `AiError` for exceeding max iterations.\n").
-spec max_iterations_error(agent_state()) -> pig_protocol@error:ai_error().
max_iterations_error(State) ->
    {api_error,
        <<<<"Agent exceeded maximum iterations ("/utf8,
                (erlang:integer_to_binary(
                    erlang:element(5, erlang:element(2, State))
                ))/binary>>/binary,
            ")"/utf8>>}.