Añadida funcionalidad de intervalos en cartas blancas

backend/api/services/docit2mf_build_service.py

@@ -0,0 +1,61 @@
+# services/docit2mf_build_service.py
+
+from typing import List, Union
+from api.models.docit2mf_models import DoCIT2MFRequest
+from api.models.docmf_models import DoCMFRequest
+from api.services.docmf_build_service import build_doc_mf_level
+
+
+def _extract_bounds(values: List[Union[int, List[int], tuple]], mode: str) -> List[int]:
+    """
+    Devuelve una lista de enteros:
+    - Si el valor es un entero → se usa tal cual para LMF y UMF
+    - Si es un intervalo [min,max] → se usa min o max según mode
+    """
+    result = []
+    for item in values:
+        if isinstance(item, int):
+            # valor fijo → mismo para LMF y UMF
+            result.append(item)
+        else:
+            lo, hi = item
+            result.append(lo if mode == "min" else hi)
+    return result
+
+
+def build_it2mf_from_level(level: DoCIT2MFRequest):
+    # LMF (mínimos)
+    left_min = _extract_bounds(level.left_blank_cards, "min")
+    right_min = _extract_bounds(level.right_blank_cards, "min")
+
+    lower_level = DoCMFRequest(
+        term=level.term,
+        core=level.core,
+        support=level.support,
+        left_nodes_x=level.left_nodes_x,
+        left_blank_cards=left_min,
+        right_nodes_x=level.right_nodes_x,
+        right_blank_cards=right_min,
+    )
+    lower = build_doc_mf_level(lower_level)
+
+    # UMF (máximos)
+    left_max = _extract_bounds(level.left_blank_cards, "max")
+    right_max = _extract_bounds(level.right_blank_cards, "max")
+
+    upper_level = DoCMFRequest(
+        term=level.term,
+        core=level.core,
+        support=level.support,
+        left_nodes_x=level.left_nodes_x,
+        left_blank_cards=left_max,
+        right_nodes_x=level.right_nodes_x,
+        right_blank_cards=right_max,
+    )
+    upper = build_doc_mf_level(upper_level)
+
+    return {
+        "term": level.term,
+        "lower": lower,
+        "upper": upper
+    }