from typing import List


def _create_component_schema(component_name: str, field_names: List):
    """
    Build a schema for a given component and fieds list
    
    PARAMS
    ======
        component_name: string
            Name of the component to build a schema for
        
        field_names: list of strings
            Name of all the fields included in this component
            
    RETURNS
    =======
        component_schema: dict 
            A dictionnary containing the detailed schema for a given component
    """
    # Initialize the dictionary with the component name:
    component_schema = dict()
    component_schema['ComponentName'] = component_name
    
    # Loops through all the fields:
    col_list = []
    is_first_field = True
    component_schema['Columns'] = col_list
    for field_name in field_names:
        # The first field is considered to be the timestamp:
        if is_first_field:
            ts_col = dict()
            ts_col['Name'] = field_name
            ts_col['Type'] = 'DATETIME'
            col_list.append(ts_col)
            is_first_field = False
            
        # All the other fields are supposed to be float values:
        else:
            attr_col = dict()
            attr_col['Name'] = field_name
            attr_col['Type'] = 'DOUBLE'
            col_list.append(attr_col)
            
    return component_schema