concat method

@override AIChatMessage concat(ChatMessage other)

Merges this message with another by concatenating the content.

Implementation

@override
AIChatMessage concat(final ChatMessage other) {
  if (other is! AIChatMessage) {
    return this;
  }

  final toolCalls = <AIChatMessageToolCall>[];
  if (this.toolCalls.isNotEmpty || other.toolCalls.isNotEmpty) {
    final thisToolCallsById = {
      for (final toolCall in this.toolCalls) toolCall.id: toolCall,
    };
    final otherToolCallsById = {
      for (final toolCall in other.toolCalls)
        (toolCall.id.isNotEmpty
            ? toolCall.id
            : (this.toolCalls.lastOrNull?.id ?? '')): toolCall,
    };
    final toolCallsIds = {
      ...thisToolCallsById.keys,
      ...otherToolCallsById.keys,
    };

    for (final id in toolCallsIds) {
      final thisToolCall = thisToolCallsById[id];
      final otherToolCall = otherToolCallsById[id];
      toolCalls.add(
        AIChatMessageToolCall(
          id: id,
          name: (thisToolCall?.name ?? '') + (otherToolCall?.name ?? ''),
          argumentsRaw: (thisToolCall?.argumentsRaw ?? '') +
              (otherToolCall?.argumentsRaw ?? ''),
          arguments: {
            ...?thisToolCall?.arguments,
            ...?otherToolCall?.arguments,
          },
        ),
      );
    }
  }

  return AIChatMessage(
    content: content + other.content,
    toolCalls: toolCalls,
  );
}