/** @license 2023 Neil Edelman, distributed under the terms of the
 [MIT License](https://opensource.org/licenses/MIT).

 Scan source files for meanings.

 @std C99 */

#include "journal.h"
#include "scan.h"
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h> /* getcwd, chdir */

int main(void) {
	const char *intent = "start";
	struct journal jrnl = {0};
	struct scan scn = {0};
	int showhelp = 1;
	FILE *fpwhere = 0;
	char cwd[PATH_MAX], jdir[PATH_MAX];

	errno = 0;

	intent = "current directory";
	if(!getcwd(cwd, sizeof(cwd))) goto catch;

	intent = "interpret";
	if(!(fpwhere = fopen(intent, "r"))) goto catch;
	if(!fgets(jdir, sizeof jdir, fpwhere)) {
		if(!errno) errno = EDOM;
		fprintf(stderr, "first line error\n");
		goto catch;
	}
	if(fgetc(fpwhere) != EOF) {
		fprintf(stderr, "expected eof\n");
		errno = EDOM; goto catch;
	}
	/* Could be something other than EOF. */
	if(errno || (fclose(fpwhere) == EOF && (fpwhere = 0, 1))) goto catch;
	fpwhere = 0;
	jdir[strcspn(jdir, "\n")] = '\0'; /* Strip. */
	if(chdir(jdir)) {
		fprintf(stderr, "while switching to directory: %s\n", jdir);
		goto catch;
	}
	showhelp = 0;

	intent = "journal";
	jrnl = journal();
	fprintf(stderr, "Journal: %s.\n", journal_to_string(&jrnl));
	if(errno) goto catch;

	intent = cwd;
	if(chdir(cwd)) goto catch;

	intent = "parse";
	scn = scan(&jrnl);
	//fprintf(stderr, "Scan: %s.\n", scan_to_string(&scrs));
	// <- Not sure what that would do.
	if(errno) goto catch;

	intent = "score.gnu";
	if(!freopen(intent, "w", stdout)) goto catch;
	scan_score_graph(&scn);

	intent = "labs.csv";
	if(!freopen(intent, "w", stdout)) goto catch;
	scan_labs_graph(&scn);

	intent = "glider.gnu";
	if(!freopen(intent, "w", stdout)) goto catch;
	scan_glider_graph(&scn);

	intent = "flight.gnu";
	if(!freopen(intent, "w", stdout)) goto catch;
	scan_flight_graph(&scn);

	intent = "kjv.gnu";
	if(!freopen(intent, "w", stdout)) goto catch;
	scan_kjv_graph(&scn);

	intent = "dream.gnu";
	if(!freopen(intent, "w", stdout)) goto catch;
	scan_dream_graph(&scn);

	intent = 0;
	goto finally;
catch:
	perror(intent);
finally:
	/* fixme: ~scan should be idempotent but it's not on disabling ASLR, which
	 debug mode is in. */
	if(fpwhere && fclose(fpwhere) == EOF)
		intent = "interpret", perror(intent);
	scan_(&scn);
	journal_(&jrnl);
	if(intent && showhelp)
		fprintf(stderr, "\nMeant to be run in a directory with a file called "
		"\"interpret\".\n"
		"The contents of that file shall be a directory wherein\n"
		"<year>/<month>/<day>.txt, eg 2000/12/01.txt.\n"
		"Loads all journal entries and parses them, outputting to the "
		"current directory.\n\n");
	return intent ? EXIT_FAILURE : EXIT_SUCCESS;
}