#ifndef CCNR_H
#define CCNR_H

//heads
#include <vector>
#include <iostream>
#include <fstream>
#include <sstream>
#include <cmath>
#include <cstdlib>
#include <string.h>
#include <stdio.h>
#include <ctime>
#include <vector>
//these two h files are for timing under linux
#include <sys/times.h> 
#include <unistd.h>
//---------------------
using namespace std;


//--------------------------
//functions in basis.h & basis.cpp
struct lit {
	unsigned char sense:1;	//is 1 for true literals, 0 for false literals.
	int clause_num:31;		//clause num, begin with 0
	int var_num;			//variable num, begin with 1
	lit(int the_lit, int the_clause) {
		var_num = abs(the_lit);
		clause_num = the_clause;
		sense = the_lit>0 ? 1: 0;
		}
	struct lit& operator^=(const struct lit &l) {
		sense ^= l.sense;
		clause_num ^= l.clause_num;
		var_num ^= l.var_num;
		return *this;
	}
	void reset(void) {
		sense = 0;
		clause_num = 0;
		var_num = 0;
	}
	bool operator==(const struct lit &l) const {
		return sense == l.sense && clause_num == l.clause_num && var_num == l.var_num;
	}
	bool operator!=(const struct lit &l) const {
		return !(*this == l);
	}
};
struct variable {
	vector<lit> literals;
	vector<int>	neighbor_var_nums;	
	long long	score;
	long long	last_flip_step;
	int			unsat_appear;	
	bool		cc_value;
	bool		is_in_ccd_vars;
};
struct clause {
	vector<lit> 	literals;	
	int		sat_count;
	int		sat_var;	
	long long	weight;
};
//timing
static struct tms _start_time;	
static double get_runtime() {
	struct tms stop;
	times(&stop);
	return (double) (stop.tms_utime - _start_time.tms_utime +stop.tms_stime - _start_time.tms_stime) / sysconf(_SC_CLK_TCK);
}
static void  start_timing() { times(&_start_time);}
//;;;;;;;


//---------------------------
//functions in mersenne.h & mersenne.cpp

class Mersenne {
  static const int N = 624;
  unsigned int mt[N];
  int mti;
public:
  Mersenne();             // seed with time-dependent value
  Mersenne(int seed);     // seed with int value; see comments for the seed() method
  Mersenne(unsigned int *array, int count); // seed with array
  Mersenne(const Mersenne &copy);
  Mersenne &operator=(const Mersenne &copy);
  void seed(int s);
  void seed(unsigned int *array, int len);
  unsigned int next32();  // generates random integer in [0..2^32-1]
  int next31();           // generates random integer in [0..2^31-1]
  double nextClosed();    // generates random float in [0..1], 2^53 possible values
  double nextHalfOpen();  // generates random float in [0..1), 2^53 possible values
  double nextOpen();      // generates random float in (0..1), 2^53 possible values
  int next(int bound);    // generates random integer in [0..bound), bound < 2^31
};

class ls_solver {
public:
	ls_solver();
	bool 	parse_arguments(int argc, char ** argv);
	bool	build_instance(string inst);
	bool	local_search( const vector<bool>* init_solution = 0);	
	void 	print_solution(bool need_verify=0);
	void	simple_print();
	int		get_best_cost() {return _best_found_cost;}	
	void	run(int argc, char ** argv);	
//private:
	//formula
	string				_inst_file;
	vector<variable> 	_vars;
	vector<clause>  	_clauses;
	int		_num_vars;
	int		_num_clauses;
	int		_additional_len;
	//data structure used
	vector<int>		_unsat_clauses;
	vector<int>		_index_in_unsat_clauses;
	vector<int>		_unsat_vars;
	vector<int>		_index_in_unsat_vars;
	vector<int>		_ccd_vars;
	//solution information
	vector<bool> 	_solution;
	int		_best_found_cost;
	double	_best_cost_time;
	long long 	_step;
	long long	_max_steps;
	int			_max_tries;
	int			_time_limit;
	//aiding data structure
	Mersenne		_random_gen;		//random generator
	int				_random_seed;
	//algorithmic parameters
	///////////////////////////
	bool 	_aspiration_active;
	int 	_aspiration_score;
	//clause weighting
	int   	_swt_threshold;
	float 	_swt_p;//w=w*p+ave_w*q
	float 	_swt_q;
	int		_avg_clause_weight;
	long long		_delta_total_clause_weight;
	//main functions
	void	initialize(const vector<bool>* init_solution = 0);
	void	initialize_variable_datas();
	void	clear_prev_data();
	int		pick_var();
	void	flip(int flipv);
	void	update_cc_after_flip(int flipv);
	void 	update_clause_weights();
	void	smooth_clause_weights();
	//funcitons for basic operations
	void	sat_a_clause(int the_clause);
	void	unsat_a_clause(int the_clause);
	//functions for buiding data structure
	bool	make_space();
	void	build_neighborhood();
	int		get_cost() {return _unsat_clauses.size();}
		
};

#endif