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#include "aoc.h"
#include "icc.h"
#include "util.h"
#include "allocator.h"
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
void
run_amp(struct icc *icc, int phase, int input, int *out)
{
int in_cnt, out_cnt;
in_cnt = out_cnt = 0;
while (icc->state != ICC_HALT) {
icc_step_inst(icc);
switch (icc->state) {
case ICC_INPUT:
assert(in_cnt <= 1);
icc->in = (in_cnt == 0) ? phase : input;
in_cnt++;
break;
case ICC_OUTPUT:
assert(out_cnt == 0);
*out = icc->out;
out_cnt++;
break;
}
}
}
void
bf_phase(struct icc *icc, struct dvec *inst, size_t *state,
size_t max_depth, size_t depth, int in, int *max, size_t *maxstate)
{
size_t i, k;
int out;
if (depth == max_depth) {
aoc_debug("SETTING %i%i%i%i%i -> %i\n", state[0], state[1],
state[2], state[3], state[4], in);
if (*max == 0 || in > *max) {
*max = in;
memcpy(maxstate, state, sizeof(int) * max_depth);
}
return;
}
for (i = 0; i < max_depth; i++) {
/* dont reuse phase setting */
for (k = 0; k < depth; k++)
if (state[k] == i) break;
if (k != depth) continue;
state[depth] = i;
icc_reset(icc, inst);
aoc_debug("START AMP %i (%i):\n", depth, i);
run_amp(icc, (int) i, in, &out);
aoc_debug("END AMP %i (%i): %i -> %i\n", depth, i, in, out);
bf_phase(icc, inst, state, max_depth,
depth + 1, out, max, maxstate);
}
}
int
run_phase_loop(struct icc *iccs, struct dvec *inst, size_t *state, size_t n)
{
size_t i;
int passes, done;
int *ins, out, in_cnt;
ins = malloc(n * sizeof(int));
assert(ins != NULL);
for (i = 0; i < n; i++)
icc_reset(&iccs[i], inst);
ins[0] = 0;
passes = done = 0;
while (!done) {
for (i = 0; i < n; i++) {
in_cnt = 0;
aoc_debug("START AMP %i (%i):\n", i, state[i]);
while (iccs[i].state != ICC_HALT) {
icc_step_inst(&iccs[i]);
switch (iccs[i].state) {
case ICC_INPUT:
iccs[i].in =
(!passes && !in_cnt
? (int) state[i] : ins[i]);
in_cnt++;
break;
case ICC_OUTPUT:
ins[(i+1) % n] = iccs[i].out;
break;
}
if (iccs[i].state == ICC_OUTPUT)
break;
}
if (iccs[i].state == ICC_HALT)
done = 1;
aoc_debug("END AMP %i (%i): %i -> %i\n", i,
state[i], ins[i], ins[(i+1) % n]);
}
passes += 1;
}
out = ins[0];
free(ins);
return out;
}
void
bf_phase_loop(size_t *state, size_t max_depth, size_t depth,
struct icc *iccs, void *inst, int *max, size_t *maxstate)
{
size_t i, k;
int out;
if (depth == max_depth) {
out = run_phase_loop(iccs, inst, state, max_depth);
aoc_debug("SETTING %i%i%i%i%i -> %i\n", state[0], state[1],
state[2], state[3], state[4], out);
if (*max == 0 || out > *max) {
*max = out;
memcpy(maxstate, state, sizeof(int) * max_depth);
}
return;
}
for (i = 0; i < max_depth; i++) {
for (k = 0; k < depth; k++)
if (state[k] - 5 == i) break;
if (k != depth) continue;
state[depth] = i + 5;
bf_phase_loop(state, max_depth, depth + 1, iccs, inst, max, maxstate);
}
}
void
part1(void)
{
struct icc icc;
struct dvec inst;
size_t state[5], maxstate[5];
int max;
icc_init(&icc);
icc_parse_inst(&icc, aoc.input, aoc.input_size);
dvec_init(&inst, sizeof(int), 0, &stdlib_heap_allocator);
dvec_copy(&inst, &icc.instructions);
max = 0;
bf_phase(&icc, &inst, state, 5, 0, 0, &max, maxstate);
aoc_debug("\nMAX SETTING: %i%i%i%i%i\n", maxstate[0], maxstate[1],
maxstate[2], maxstate[3], maxstate[4]);
aoc.answer = aprintf("%i", max);
aoc.solution = "24625";
dvec_deinit(&inst);
icc_deinit(&icc);
}
void
part2(void)
{
size_t state[5], maxstate[5];
struct icc iccs[5];
struct dvec inst;
int i, max;
icc_init(&iccs[0]);
icc_parse_inst(&iccs[0], aoc.input, aoc.input_size);
dvec_init(&inst, sizeof(int), 0, &stdlib_heap_allocator);
dvec_copy(&inst, &iccs[0].instructions);
for (i = 1; i < 5; i++) {
icc_init(&iccs[i]);
icc_copy(&iccs[i], &iccs[0]);
}
max = 0;
bf_phase_loop(state, 5, 0, iccs, &inst, &max, maxstate);
aoc_debug("\nMAX SETTING: %i%i%i%i%i\n", maxstate[0], maxstate[1],
maxstate[2], maxstate[3], maxstate[4]);
aoc.answer = aprintf("%i", max);
aoc.solution = "36497698";
dvec_deinit(&inst);
for (i = 0; i < 5; i++)
icc_deinit(&iccs[i]);
}
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