#include "interpret.h"
#include "lex.h"
#include <unistd.h> /* chdir (POSIX) */
#include <sys/types.h> /* mode_t (POSIX) */
#include <sys/stat.h> /* umask (POSIX) */
#include <dirent.h> /* opendir readdir closedir */
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>

#if INT_MAX >= 100000000000
#error int_to_string requires truncation on this compiler.
#endif
static void int_to_string(const int *const n,
	char (*const a)[12]) { sprintf(*a, "%d", *n); }
#define ARRAY_NAME int
#define ARRAY_TYPE int
#define ARRAY_EXPECT_TRAIT
#include "../src/array.h"
#define ARRAY_TO_STRING &int_to_string
#include "../src/array.h"
static int int_cmp(const int *const a, const int *const b)
	{ return (*b < *a) - (*a < *b); }
static int void_int_cmp(const void *const a, const void *const b)
	{ return int_cmp(a, b); }

int main(int argc, char **argv) {
	int success = EXIT_FAILURE;
	DIR *dir = 0;
	struct dirent *de;
	struct int_array years = ARRAY_IDLE, months = ARRAY_IDLE, days = ARRAY_IDLE;
	int *y, *y_end;

	/* Get the years list as directories matching a year in order. */
	errno = 0;
	if(argc != 2) { fprintf(stderr, "Needs journal location.\n"
		"(should contain <year>/<month>/<day>.txt)\n"); goto finally; }
	if(chdir(argv[1]) == -1 || !(dir = opendir("."))) goto catch;
	while((de = readdir(dir))) {
		struct stat st;
		int year, *p;
		if(!looks_like_year(de->d_name, &year)) continue;
		if(stat(de->d_name, &st)) goto catch;
		if(!S_ISDIR(st.st_mode)) continue;
		if(!(p = int_array_new(&years))) goto catch;
		*p = year;
	}
	closedir(dir), dir = 0;
	qsort(years.data, years.size, sizeof *years.data, &void_int_cmp);
	fprintf(stderr, "%s: %s.\n", argv[1], int_array_to_string(&years));

	/* Go though each year. */
	for(y = years.data, y_end = y + years.size; y < y_end; y++) {
		char temp[64];
		int *m, *m_end;
		sprintf(temp, "%d", *y);

		/* Get the months as directories. */
		if(chdir(temp) == -1 || !(dir = opendir("."))) goto catch;
		while((de = readdir(dir))) {
			struct stat st;
			int month, *p;
			if(!(month = looks_like_month(de->d_name))) continue;
			if(stat(de->d_name, &st)) goto catch;
			if(!S_ISDIR(st.st_mode)) continue;
			if(!(p = int_array_new(&months))) goto catch;
			*p = month;
		}
		closedir(dir), dir = 0;
		qsort(months.data, months.size, sizeof *months.data, &void_int_cmp);
		fprintf(stderr, "%s: %s.\n", temp, int_array_to_string(&months));

		/* Go though each month. */
		for(m = months.data, m_end = m + months.size; m < m_end; m++) {
			int *d, *d_end;
			sprintf(temp, "%.2d", *m);

			/* Get the days as files. */
			if(chdir(temp) == -1 || !(dir = opendir("."))) goto catch;
			while((de = readdir(dir))) {
				struct stat st;
				int day, *p;
				/* fixme: Have yyyy-mm-dd to figure out how many days. */
				if(!(day = looks_like_day(de->d_name))) continue;
				if(stat(de->d_name, &st)) goto catch;
				if(S_ISDIR(st.st_mode)) continue;
				if(!(p = int_array_new(&days))) goto catch;
				*p = day;
			}
			closedir(dir), dir = 0;
			qsort(days.data, days.size, sizeof *days.data, &void_int_cmp);
			fprintf(stderr, "%s: %s.\n", temp, int_array_to_string(&days));

			for(d = days.data, d_end = d + days.size; d < d_end; d++) {
				printf("%d-%.2d-%.2d\n", *y, *m, *d);
			}

			int_array_clear(&days);
			if(chdir("..") == -1) goto catch;
		}

		int_array_clear(&months);
		if(chdir("..") == -1) goto catch;
	}
	{ success = EXIT_SUCCESS; goto finally; }
catch:
	perror("interpret");
finally:
	if(dir) closedir(dir);
	int_array_(&years);
	int_array_(&months);
	return EXIT_FAILURE;
}