Extend lookup table model

Author: jacob720

src/daq_config_server/models/converters/lookup_tables/_models.py

@@ -17,3 +17,24 @@ def check_row_length_matches_n_columns(self):
                     f"of columns: {self.column_names}"
                 )
         return self
+
+    def get_value(
+        self,
+        column_name: str,
+        value: int | float,
+        target_column_name: str,
+        value_must_exist: bool = True,
+    ) -> int | float:
+        column_index = self.column_names.index(column_name)
+        column = [row[column_index] for row in self.rows]
+        target_column_index = self.column_names.index(target_column_name)
+
+        closest_value = (
+            min(column, key=lambda x: abs(x - value)) if not value_must_exist else value
+        )
+        target_row = self.rows[column.index(closest_value)]
+
+        return target_row[target_column_index]
+
+    def columns(self) -> list[list[int | float]]:
+        return [[row[i] for row in self.rows] for i in range(len(self.column_names))]