/** @license 2022 Neil Edelman, distributed under the terms of the
 [MIT License](https://opensource.org/licenses/MIT).

 Scan journal entries for kjv references. */

#include "../src/journal.h"
#include "../src/scan_flight.h"
#include <inttypes.h> /* C99 */
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <limits.h>

/*!conditions:re2c*/

int flight_scan(union date32 date, const char *const buffer,
	struct flights *const f) {
	const char *YYCURSOR, *YYMARKER, *yyt1, *yyt2, *yyt3, *s0, *s1, *t0, *t1;
	enum flight_type type = Glider;
	enum YYCONDTYPE condition = yycline;
	size_t line = 1;
	char datestr[12] = {0};
	const char *why = "unexpected";
	assert(buffer && f);
	YYCURSOR = YYMARKER = yyt1 = buffer;
	/*!re2c /**/
	re2c:define:YYCTYPE = char;
	re2c:yyfill:enable = 0;
	re2c:define:YYGETCONDITION = "condition";
	re2c:define:YYSETCONDITION = "condition = @@;";
	re2c:define:YYGETCONDITION:naked = 1;
	re2c:define:YYSETCONDITION:naked = 1;

	unix_control = [\x01-\x08\x0b-\x1f\x7f];
	ws = [ \t];
	glyph = [^] \ ("\x00" | "\n" | unix_control | ws);
	natural = [1-9][0-9]*;
	keyword = [A-Za-z0-9][A-Za-z0-9_-]*;
	*/
	for( ; ; ) { /*!re2c /**/
		/* Default ignore. */
		<skip> [^\n\x00] { continue; }
		<skip> "\x00" { why = "no newline at end of file"; goto catch; }
		<line> "\x00" { return 1; }
		<line, skip> "\n" => line { line++; continue; }
		<line> * :=> skip
		<line> "::" / [^:] :=> score

		<score> * { why = "default score unrecognized"; goto catch; }
		<source> @s0 keyword @s1 / "\n" => skip { also_add_to_tree: {
			const struct pair keyword = pair(s0, s1);
			const union line64 key = { { (uint32_t)line, date } };
			size_t i, *pi;
			if(line > UINT32_MAX)
				{ errno = ERANGE; why = "too many lines of text"; goto catch; }
			if(!(i = scoremap_table_get(&s->map, keyword)))
				{ why = "keyword not introduced"; goto catch; }
			switch(score_tree_try(&s->dates, key, &pi)) {
			case TREE_PRESENT: why = "duplicate key"; /* _Sic_. */
			case TREE_ERROR: goto catch;
			case TREE_ABSENT: *pi = i; break;
			}
			/*date32_to_string(date, &datestr);
			printf("%s: <%.*s>\n", datestr, (int)(s1 - s0), s0);*/
			continue;
		} }
		/* This is lazy and will pickup trailing spaces. */
		<source> @s0 keyword @s1 ":" [^\x00\n]+ / "\n" => skip {
			struct pair keyword = pair(s0, s1);
			size_t *idx;
			struct score *score;
			switch(scoremap_table_assign(&s->map, keyword, &idx)) {
			case TABLE_PRESENT: errno = EDOM; why = "new keyword already used";
			case TABLE_ERROR: goto catch; /* /\ _Sic_. */
			case TABLE_ABSENT: *idx = 0; break; /* Good. */
			}
			if(!(source = scorelist_array_new(&s->list))) goto catch;
			*idx = (size_t)(score - s->list.data);
			score->name.a = s0, score->name.b = s1;
			score->desc.a = 0, score->desc.b = 0;
			date32_to_string(date, &datestr);
			fprintf(stderr, "%s: new source <%.*s> stored in list at %zu.\n",
				datestr, (int)(s1 - s0), s0, *idx);
			goto also_add_to_tree;
		}
	*/ }
	assert(0); /* Never gets here. */
catch:
	if(!errno) errno = EILSEQ;
	date32_to_string(date, &datestr);
	fprintf(stderr, "%s\n"
		"%s line %zu: %s.\n", buffer, datestr, line, why);
	return 0;
}