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#include "transformations.h"
int edge_slice(int e); /* Return slice (e=0, s=1, m=2) to which e belongs */
Cube rotate_via_compose(Transformation r, Cube c, PieceFilter f);
bool read_rtables_file();
bool write_rtables_file();
/* Values mod 3 to determine from which side to take the state to convert */
int epose_source[NTRANS]; /* 0 = epose, 1 = eposs, 2 = eposm */
int eposs_source[NTRANS];
int eposm_source[NTRANS];
int eofb_source[NTRANS]; /* 0 = eoud, 1 = eorl, 2 = eofb */
int eorl_source[NTRANS];
int eoud_source[NTRANS];
int coud_source[NTRANS]; /* 0 = coud, 1 = corl, 2 = cofb */
int cofb_source[NTRANS];
int corl_source[NTRANS];
/* Transition tables for rotations (n+1 is mirror) */
uint16_t epose_rtable[NTRANS][factorial12/factorial8];
uint16_t eposs_rtable[NTRANS][factorial12/factorial8];
uint16_t eposm_rtable[NTRANS][factorial12/factorial8];
uint16_t eo_rtable[NTRANS][pow2to11];
uint16_t cp_rtable[NTRANS][factorial8];
uint16_t co_rtable[NTRANS][pow3to7];
uint16_t cpos_rtable[NTRANS][factorial6];
/* Same for moves */
uint16_t moves_rtable[NTRANS][NMOVES];
NissMove rotation_niss[NTRANS][6];
int edge_slice(int e) {
if (e == FR || e == FL || e == BL || e == BR)
return 0;
if (e == UR || e == UL || e == DR || e == DL)
return 1;
return 2;
}
Cube rotate_via_compose(Transformation r, Cube c, PieceFilter f) {
if (r != mirror) {
return apply_alg_filtered(rotation_niss[r], c, f);
} else {
static int zero12[12] = {0,0,0,0,0,0,0,0,0,0,0,0},
zero8[12] = {0,0,0,0,0,0,0,0},
mirror_ep[12] = {UF,UR,UB,UL,DF,DR,DB,DL,FL,FR,BR,BL},
mirror_cp[8] = {UFL, UFR, UBR, UBL, DFL, DFR, DBR, DBL},
mirror_cpos[6] =
{U_center,D_center,L_center,R_center,F_center,B_center};
return move_via_arrays((CubeArray){
.ep = mirror_ep, .eofb = zero12, .eorl = zero12, .eoud = zero12,
.cp = mirror_cp, .coud = zero8, .corl = zero8, .cofb = zero8,
.cpos = mirror_cpos}, c, f);
}
}
bool read_rtables_file() {
FILE *ttf;
long unsigned int me[12] = { factorial12/factorial8, factorial12/factorial8,
factorial12/factorial8, pow2to11, pow2to11, pow2to11,
factorial8, pow3to7, pow3to7, pow3to7, factorial6, NMOVES };
if ((ttf = fopen("rtables", "rb")) != NULL) {
bool r = true;
for (int m = 0; m < NTRANS; m++) {
r = r && fread(epose_rtable[m], sizeof(uint16_t), me[0], ttf) == me[0];
r = r && fread(eposs_rtable[m], sizeof(uint16_t), me[1], ttf) == me[1];
r = r && fread(eposm_rtable[m], sizeof(uint16_t), me[2], ttf) == me[2];
r = r && fread(eo_rtable[m], sizeof(uint16_t), me[3], ttf) == me[3];
r = r && fread(cp_rtable[m], sizeof(uint16_t), me[6], ttf) == me[6];
r = r && fread(co_rtable[m], sizeof(uint16_t), me[7], ttf) == me[7];
r = r && fread(cpos_rtable[m], sizeof(uint16_t), me[10], ttf) == me[10];
r = r && fread(moves_rtable[m], sizeof(uint16_t), me[11], ttf) == me[11];
}
fclose(ttf);
return r;
} else return false;
}
bool write_rtables_file() {
FILE *ttf;
long unsigned int me[12] = { factorial12/factorial8, factorial12/factorial8,
factorial12/factorial8, pow2to11, pow2to11, pow2to11,
factorial8, pow3to7, pow3to7, pow3to7, factorial6, NMOVES };
if ((ttf = fopen("rtables", "wb")) != NULL) {
bool r = true;
for (int m = 0; m < NTRANS; m++) {
r = r && fwrite(epose_rtable[m], sizeof(uint16_t), me[0], ttf) == me[0];
r = r && fwrite(eposs_rtable[m], sizeof(uint16_t), me[1], ttf) == me[1];
r = r && fwrite(eposm_rtable[m], sizeof(uint16_t), me[2], ttf) == me[2];
r = r && fwrite(eo_rtable[m], sizeof(uint16_t), me[3], ttf) == me[3];
r = r && fwrite(cp_rtable[m], sizeof(uint16_t), me[6], ttf) == me[6];
r = r && fwrite(co_rtable[m], sizeof(uint16_t), me[7], ttf) == me[7];
r = r && fwrite(cpos_rtable[m], sizeof(uint16_t), me[10],ttf) == me[10];
r = r && fwrite(moves_rtable[m], sizeof(uint16_t), me[11],ttf) == me[11];
}
fclose(ttf);
return r;
} else return false;
}
void init_transformations(bool read, bool write) {
/* Compute sources */
for (int i = 0; i < NTRANS; i++) {
Cube cube = {0};
if (i != mirror)
cube = apply_alg(rotation_algs[i], (Cube){0});
epose_source[i] = edge_slice(edge_at(cube, FR));
eposs_source[i] = edge_slice(edge_at(cube, UR));
eposm_source[i] = edge_slice(edge_at(cube, UF));
eofb_source[i] = center_at(cube, F_center)/2;
eorl_source[i] = center_at(cube, R_center)/2;
eoud_source[i] = center_at(cube, U_center)/2;
coud_source[i] = center_at(cube, U_center)/2;
cofb_source[i] = center_at(cube, F_center)/2;
corl_source[i] = center_at(cube, R_center)/2;
}
/*TODO: maybe move down*/
/* Compute rotation_niss array, necessary for rotate_via_compose */
for (int r = 0; r != mirror; r++) {
concat(rotation_algs[r], rotation_algs[r], rotation_niss[r]);
for (int i = len(rotation_algs[r]); rotation_niss[r][i].m != NULLMOVE; i++)
rotation_niss[r][i].inverse = true;
}
/* If I can read tables from file, I stop here */
if (read)
if (read_rtables_file())
return;
/* Initialize tables */
for (int m = 0; m < NTRANS; m++) {
int eparr[12] = {0,0,0,0,0,0,0,0,0,0,0,0}, cparr[8] = {0,0,0,0,0,0,0,0};
CubeArray epcp = { .ep = eparr, .cp = cparr };
cube_to_arrays(apply_alg(rotation_algs[m], (Cube){0}), &epcp,
(PieceFilter){.epose=true,.eposs=true,.eposm=true,.cp=true});
for (uint16_t i = 0; i < factorial12/factorial8; i++) {
Cube c[3] = { admissible_ep((Cube){ .epose = i}, pf_e),
admissible_ep((Cube){ .eposs = i}, pf_s),
admissible_ep((Cube){ .eposm = i}, pf_m) };
epose_rtable[m][i]=rotate_via_compose(m,c[epose_source[m]],pf_ep).epose;
eposs_rtable[m][i]=rotate_via_compose(m,c[eposs_source[m]],pf_ep).eposs;
eposm_rtable[m][i]=rotate_via_compose(m,c[eposm_source[m]],pf_ep).eposm;
}
for (uint16_t i = 0; i < pow2to11; i++ ) {
int eoarr[12];
int_to_sum_zero_array(i, 2, 12, eoarr);
apply_permutation(eparr, eoarr, 12);
eo_rtable[m][i] = digit_array_to_int(eoarr, 11, 2);
}
for (uint16_t i = 0; i < pow3to7; i++) {
int coarr[12];
int_to_sum_zero_array(i, 3, 8, coarr);
apply_permutation(cparr, coarr, 8);
co_rtable[m][i] = digit_array_to_int(coarr, 7, 3);
}
for (uint16_t i = 0; i < factorial8; i++)
cp_rtable[m][i] = rotate_via_compose(m, (Cube){.cp=i}, pf_cp).cp;
for (uint16_t i = 0; i < factorial6; i++)
cpos_rtable[m][i] = rotate_via_compose(m, (Cube){.cpos=i}, pf_cpos).cpos;
for (Move i = 0; i < NMOVES; i++) {
Cube aux = transform_cube(m, move_cube(i, (Cube){0}));
for (Move move = 0; move < NMOVES; move++)
if (is_solved(move_cube(inverse[move], aux)))
moves_rtable[m][i] = move;
}
}
if (write)
if (!write_rtables_file())
printf("Error in writing rtables: file not writable\n");
}
Cube transform_cube(Transformation t, Cube cube) {
Cube transformed = {0};
uint16_t aux_epos[3] = { cube.epose, cube.eposs, cube.eposm },
aux_eo[3] = { cube.eoud, cube.eorl, cube.eofb },
aux_co[3] = { cube.coud, cube.corl, cube.cofb };
transformed.epose = epose_rtable[t][aux_epos[epose_source[t]]];
transformed.eposs = eposs_rtable[t][aux_epos[eposs_source[t]]];
transformed.eposm = eposm_rtable[t][aux_epos[eposm_source[t]]];
transformed.eofb = eo_rtable[t][aux_eo[eofb_source[t]]];
transformed.eorl = eo_rtable[t][aux_eo[eorl_source[t]]];
transformed.eoud = eo_rtable[t][aux_eo[eoud_source[t]]];
transformed.coud = co_rtable[t][aux_co[coud_source[t]]];
transformed.corl = co_rtable[t][aux_co[corl_source[t]]];
transformed.cofb = co_rtable[t][aux_co[cofb_source[t]]];
transformed.cp = cp_rtable[t][cube.cp];
transformed.cpos = cpos_rtable[t][cube.cpos];
return transformed;
}
void transform_alg(Transformation t, NissMove *alg) {
for (int i = 0; alg[i].m; i++)
alg[i].m = moves_rtable[t][alg[i].m];
}
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