#!/usr/bin/env python3

from . import randomSAT

class Random_instance_pool:
    
    def __init__(self, parameter_range):
        self.__parameter_range = parameter_range
    
    def __iter__(self):
        return self
            
    def __next__(self):
        params = self.__parameter_range.next()
        
        return randomSAT.generateRandomKSAT(params.number_of_clauses,
                                            params.number_of_variables,
                                            params.variables_per_clause)
    
    
class Instance_parameters:
    
    def __init__(self,
                 number_of_clauses,
                 number_of_variables,
                 variables_per_clause = 3):
        
        self.number_of_clauses = number_of_clauses
        self.number_of_variables = number_of_variables
        self.variables_per_clause = variables_per_clause
        
    def __str__(self):
        return ("number of clauses: {}\n"
                "number of variables: {}\n"
                "variables per clause: {}").format(self.number_of_clauses,
                                                    self.number_of_variables,
                                                    self.variables_per_clause)
        
class Instance_parameter_variable_range:
    
    def __init__(self, start_parameter, variable_range): 
        self.start_parameter = start_parameter
        self.__variable_range = variable_range
        
    def __iter__(self):
        return self
    
    def __next__(self):
        self.start_parameter.number_of_variables = self.__variable_range.next()
        
        return self.start_parameter
    
    def next(self):
        return self.__next__()
        
    
class Manual_range:
    
    def __init__(self, start, stop, step = 1):
        self.start = start
        self.stop = stop
        self.step = step
        
        self.__current = start
        
    def __iter__(self):
        return self
    
    def __next__(self):
        if self.__current >= self.stop:
            raise StopIteration
        
        self.__current += self.step
        
        return self.__current
    
    def next(self):
        return self.__next__()