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<?php |
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/** |
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* AgentLoop — one frontend-driven iteration of the WPFunnels AI agent. |
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* |
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* Each step() call performs exactly ONE model request plus its tool batch, |
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* then returns; the client immediately requests the next step while status is 'running'. |
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* This bounds every HTTP request to a single model round-trip — avoiding PHP timeouts. |
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* |
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* States returned by step(): |
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* running — tools executed; client should call step() again |
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* pending_confirmation — a destructive tool awaits user approval (confirm()) |
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* done — final assistant text produced |
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* rate_limited — provider throttled this request; client should wait |
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* `retry_after` seconds and call step() again (same |
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* turn — nothing was persisted for this attempt) |
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* error — provider or loop failure (message included) |
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* |
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* @package WPFunnels\AI |
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* @since 3.13.0 |
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*/ |
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|
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namespace WPFunnels\AI; |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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use WPFunnels\AI\Settings\AISettings; |
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|
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/** |
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* Class AgentLoop |
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*/ |
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class AgentLoop { |
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|
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/** |
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* Maximum autonomous model iterations per turn. |
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*/ |
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public const MAX_STEPS_PER_TURN = 25; |
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|
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/** |
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* Run one loop iteration for a conversation. |
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* |
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* @param int $conversation_id Conversation ID. |
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* @param int $user_id Current user ID. Defaults to get_current_user_id(). |
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* @return array |
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*/ |
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public static function step( $conversation_id, $user_id = 0 ) { |
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$user_id = $user_id ? (int) $user_id : get_current_user_id(); |
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$conversation = ConversationStore::getOwnedConversation( $conversation_id, $user_id ); |
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|
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if ( ! $conversation ) { |
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return self::errorState( 'Conversation not found or access denied.' ); |
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} |
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|
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if ( 'awaiting_confirmation' === $conversation['status'] ) { |
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return [ |
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'status' => 'pending_confirmation', |
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'pending' => self::pendingForClient( $conversation['pending'] ), |
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]; |
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} |
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|
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$messages = ConversationStore::getMessages( $conversation_id ); |
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if ( empty( $messages ) ) { |
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return self::errorState( 'Conversation has no messages yet.' ); |
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} |
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|
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$steps_this_turn = ConversationStore::assistantStepsThisTurn( $messages ); |
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|
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// Turn budget check. |
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if ( $steps_this_turn >= self::MAX_STEPS_PER_TURN ) { |
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$note = 'I hit the step limit for this request. Here is where things stand — tell me to continue if you want me to keep going.'; |
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ConversationStore::appendMessage( $conversation_id, 'assistant', [ 'text' => $note, 'tool_calls' => [] ] ); |
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ConversationStore::updateConversation( $conversation_id, [ 'status' => 'idle' ] ); |
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return [ |
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'status' => 'done', |
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'message' => $note, |
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]; |
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} |
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|
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$provider = AIInit::activeProvider(); |
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if ( is_wp_error( $provider ) ) { |
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return self::errorState( $provider->get_error_message(), $provider->get_error_code() ); |
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} |
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|
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$system = SystemPrompt::build( (string) $conversation['context_type'], (int) $conversation['context_id'] ); |
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$tools = ToolGateway::toolDefinitions(); |
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|
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// First model call of the turn must call a tool — otherwise the model can |
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// answer with pure narration ("I'll do X now...", no tool_calls), which |
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// this loop would then treat as a finished turn (see below) and nothing |
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// ever gets built. Once real progress has been made this turn, later |
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// steps go back to 'auto' so the model can produce its final text reply. |
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$force_tool_use = 0 === $steps_this_turn && ! empty( $tools ); |
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|
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$response = $provider->chat( $system, $messages, $tools, $force_tool_use ); |
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if ( is_wp_error( $response ) ) { |
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if ( 'ai_rate_limited' === $response->get_error_code() ) { |
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// Transient — nothing was persisted for this attempt (no message |
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// appended, turn budget untouched), so the client can just wait |
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// out the provider's own cooldown and call step() again for the |
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// SAME turn, instead of surfacing a dead-end error banner over |
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// what is normally a few-second throttle. |
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$data = $response->get_error_data(); |
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$retry_after = ! empty( $data['retry_after'] ) ? (float) $data['retry_after'] : 5.0; |
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return [ |
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'status' => 'rate_limited', |
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'message' => $response->get_error_message(), |
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'retry_after' => $retry_after, |
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]; |
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} |
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return self::errorState( $response->get_error_message(), $response->get_error_code() ); |
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} |
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|
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// Persist the assistant response message. |
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ConversationStore::appendMessage( |
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$conversation_id, |
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'assistant', |
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[ |
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'text' => $response['text'], |
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'tool_calls' => $response['tool_calls'], |
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], |
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[ |
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'provider' => $provider->slug(), |
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'raw' => isset( $response['raw'] ) ? $response['raw'] : null, |
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'usage' => isset( $response['usage'] ) ? $response['usage'] : [], |
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] |
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); |
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|
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if ( empty( $response['tool_calls'] ) ) { |
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ConversationStore::updateConversation( $conversation_id, [ 'status' => 'idle' ] ); |
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return [ |
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'status' => 'done', |
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'message' => $response['text'], |
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]; |
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} |
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|
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$executed = []; |
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$pending = []; |
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$progress = null; |
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|
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foreach ( $response['tool_calls'] as $call ) { |
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$call_name = isset( $call['name'] ) ? (string) $call['name'] : ''; |
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$call_args = isset( $call['arguments'] ) && is_array( $call['arguments'] ) ? $call['arguments'] : []; |
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$call_id = isset( $call['id'] ) ? (string) $call['id'] : uniqid( 'call_' ); |
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|
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if ( ToolGateway::requiresConfirmation( $call_name ) ) { |
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$pending[] = [ |
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'id' => $call_id, |
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'name' => $call_name, |
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'arguments' => $call_args, |
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'summary' => ToolGateway::describeCall( $call_name, $call_args ), |
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'details' => ToolGateway::describeCallDetails( $call_name, $call_args ), |
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]; |
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continue; |
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} |
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|
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$result = ToolGateway::executeTool( $call_name, $call_args ); |
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|
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ConversationStore::appendMessage( |
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$conversation_id, |
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'tool', |
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[ |
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'tool_call_id' => $call_id, |
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'name' => $call_name, |
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'content' => $result['content'], |
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'is_error' => $result['is_error'], |
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'preview' => ToolGateway::previewFor( $call_name, $result ), |
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] |
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); |
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|
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$executed[] = [ |
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'tool' => $call_name, |
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'is_error' => $result['is_error'], |
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]; |
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|
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$tool_progress = ToolGateway::progressFor( $call_name ); |
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if ( $tool_progress ) { |
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$progress = $tool_progress; |
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} |
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|
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self::bindFunnelContext( $conversation_id, $call_name, $result ); |
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} |
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|
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if ( ! empty( $pending ) ) { |
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ConversationStore::updateConversation( |
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$conversation_id, |
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[ |
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'status' => 'awaiting_confirmation', |
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'pending' => $pending, |
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] |
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); |
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return [ |
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'status' => 'pending_confirmation', |
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'assistant_text' => $response['text'], |
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'executed' => $executed, |
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'pending' => self::pendingForClient( $pending ), |
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'progress' => $progress, |
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]; |
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} |
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|
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ConversationStore::updateConversation( $conversation_id, [ 'status' => 'idle' ] ); |
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|
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return [ |
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'status' => 'running', |
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'assistant_text' => $response['text'], |
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'executed' => $executed, |
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'progress' => $progress, |
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]; |
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} |
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|
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/** |
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* Resolve a pending confirmation: execute or deny queued tool calls. |
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* |
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* @param int $conversation_id Conversation ID. |
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* @param int $user_id User ID. |
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* @param bool $approve Whether approved. |
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* @param string $deny_reason Optional reason for denial. |
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* @return array |
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*/ |
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public static function confirm( $conversation_id, $user_id = 0, $approve = true, $deny_reason = '' ) { |
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$user_id = $user_id ? (int) $user_id : get_current_user_id(); |
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$conversation = ConversationStore::getOwnedConversation( $conversation_id, $user_id ); |
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|
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if ( ! $conversation ) { |
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return self::errorState( 'Conversation not found or access denied.' ); |
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} |
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|
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if ( 'awaiting_confirmation' !== $conversation['status'] || empty( $conversation['pending'] ) ) { |
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return self::errorState( 'Nothing is awaiting confirmation.' ); |
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} |
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|
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$executed = []; |
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foreach ( (array) $conversation['pending'] as $call ) { |
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$call_name = isset( $call['name'] ) ? (string) $call['name'] : ''; |
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$call_args = isset( $call['arguments'] ) && is_array( $call['arguments'] ) ? $call['arguments'] : []; |
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$call_id = isset( $call['id'] ) ? (string) $call['id'] : uniqid( 'call_' ); |
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|
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if ( $approve ) { |
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$result = ToolGateway::executeTool( |
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$call_name, |
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array_merge( $call_args, [ 'confirm' => true ] ) |
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); |
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self::bindFunnelContext( $conversation_id, $call_name, $result ); |
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} else { |
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$result = [ |
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'content' => wp_json_encode( |
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[ |
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'error' => 'denied_by_user', |
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'message' => 'The user declined this action.' . ( $deny_reason ? ' Reason: ' . $deny_reason : '' ), |
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] |
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), |
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'is_error' => true, |
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]; |
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} |
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|
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ConversationStore::appendMessage( |
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$conversation_id, |
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'tool', |
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[ |
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'tool_call_id' => $call_id, |
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'name' => $call_name, |
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'content' => $result['content'], |
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'is_error' => $result['is_error'], |
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'preview' => $approve ? ToolGateway::previewFor( $call_name, $result ) : null, |
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] |
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); |
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|
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$executed[] = [ |
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'tool' => $call_name, |
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'is_error' => $result['is_error'], |
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'approved' => (bool) $approve, |
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]; |
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} |
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|
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ConversationStore::updateConversation( |
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$conversation_id, |
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[ |
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'status' => 'idle', |
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'pending' => null, |
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] |
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); |
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|
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return [ |
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'status' => 'running', |
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'executed' => $executed, |
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]; |
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} |
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|
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/** |
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* When create-funnel or step operations succeed, bind conversation to funnel. |
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* |
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* @param int $conversation_id Conversation ID. |
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* @param string $tool_name Tool name. |
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* @param array $result Execution result. |
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* @return void |
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*/ |
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private static function bindFunnelContext( $conversation_id, $tool_name, $result ) { |
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if ( ! empty( $result['is_error'] ) ) { |
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return; |
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} |
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|
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if ( ! in_array( $tool_name, [ 'wpfunnels/create-funnel', 'wpfunnels/create-step', 'wpfunnels/reorder-steps', 'wpfunnels/import-funnel-template' ], true ) ) { |
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return; |
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} |
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|
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$decoded = json_decode( (string) ( isset( $result['content'] ) ? $result['content'] : '' ), true ); |
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if ( ! empty( $decoded['funnel_id'] ) ) { |
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ConversationStore::updateConversation( |
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$conversation_id, |
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[ |
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'context_type' => 'funnel', |
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'context_id' => (int) $decoded['funnel_id'], |
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] |
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); |
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} |
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} |
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|
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/** |
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* Normalize pending calls for client responses. |
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* |
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* @param mixed $pending Pending array. |
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* @return array |
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*/ |
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public static function pendingForClient( $pending ) { |
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return array_map( |
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static function ( $call ) { |
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$name = isset( $call['name'] ) ? (string) $call['name'] : ''; |
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$args = isset( $call['arguments'] ) && is_array( $call['arguments'] ) ? $call['arguments'] : []; |
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|
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return [ |
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'tool' => $name, |
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'summary' => isset( $call['summary'] ) ? (string) $call['summary'] : ToolGateway::describeCall( $name, $args ), |
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'arguments' => $args, |
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'details' => isset( $call['details'] ) && is_array( $call['details'] ) |
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? $call['details'] |
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: ToolGateway::describeCallDetails( $name, $args ), |
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]; |
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}, |
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is_array( $pending ) ? $pending : [] |
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); |
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} |
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|
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/** |
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* Build error state payload. |
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* |
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* @param string $message Error message. |
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* @param string $code Error code. |
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* @return array |
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*/ |
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private static function errorState( $message, $code = 'ai_error' ) { |
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return [ |
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'status' => 'error', |
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'code' => $code, |
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'message' => $message, |
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]; |
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} |
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} |
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|
