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#pragma once
#include <functional>
#include <vector>
#include "types.h"
#include "graph.h"
template <class R_t, class X_t>
class state_t {
private:
// updating fourier terms F requires many cos and sin calls, faster to do it beforehand.
std::vector<std::vector<double>> precomputed_cos;
std::vector<std::vector<double>> precomputed_sin;
public:
D_t D;
L_t L;
v_t nv;
v_t ne;
graph_t g;
double T;
std::vector<X_t> spins;
R_t R;
double E;
typename X_t::M_t M; // the "sum" of the spins, like the total magnetization
v_t last_cluster_size;
std::vector<typename X_t::F_t> ReF;
std::vector<typename X_t::F_t> ImF;
std::function <double(const X_t&, const X_t&)> J;
std::function <double(const X_t&)> H;
state_t(D_t D, L_t L, double T, std::function <double(const X_t&, const X_t&)> J, std::function <double(const X_t&)> H) : D(D), L(L), g(D, L), T(T), R(), J(J), H(H) {
nv = g.nv;
ne = g.ne;
g.add_ext();
spins.resize(nv);
E = - (double)ne * J(spins[0], spins[0]) - (double)nv * H(spins[0]);
M = spins[0] * nv;
last_cluster_size = 0;
ReF.resize(D);
ImF.resize(D);
for (D_t i = 0; i < D; i++) {
ReF[i] = spins[0] * 0.0;
ImF[i] = spins[0] * 0.0;
}
precomputed_cos.resize(nv);
precomputed_sin.resize(nv);
for (v_t i = 0; i < nv; i++) {
precomputed_cos[i].resize(D);
precomputed_sin[i].resize(D);
for (D_t j = 0; j < D; j++) {
precomputed_cos[i][j] = cos(2 * M_PI * g.coordinate[i][j] / (double)L);
precomputed_sin[i][j] = sin(2 * M_PI * g.coordinate[i][j] / (double)L);
}
}
}
void update_magnetization(const X_t& s_old, const X_t& s_new) {
M += s_new - s_old;
}
void update_energy(const double& dE) {
E += dE;
}
void update_fourierZero(v_t v, const X_t& s_old, const X_t& s_new) {
#ifdef DIMENSION
for (D_t i = 0; i < DIMENSION; i++) {
#else
for (D_t i = 0; i < D; i++) {
#endif
ReF[i] += (s_new - s_old) * precomputed_cos[v][i];
ImF[i] += (s_new - s_old) * precomputed_sin[v][i];
}
}
};
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