#include "list_handling.h"
#include "parse_ics.h"
#include "string_handling.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>

void parse_event(char event_string[], struct event **head) {
	char *start_date = strstr(event_string, "\r\nDTSTART");
	char *end_date = strstr(event_string, "\r\nDTEND");
	char *summary = strstr(event_string, "\r\nSUMMARY");

	char *start_date_str = malloc(256);
	char *end_date_str = malloc(256);
	char *summary_str = malloc(512);

	memset(start_date_str, '\0', 256);
	memset(end_date_str, '\0', 256);
	memset(summary_str, '\0', 512);

	assert(start_date != NULL);
	assert(end_date != NULL);
	assert(summary != NULL);

	strncpy(start_date_str, start_date, strchr(start_date, '\r') - start_date);

	strncpy(end_date_str, end_date, strchr(end_date, '\r') -  end_date);

	strncpy(summary_str, summary, strchr(summary, '\r') - summary);

	// parse dates
	remove_whitespace(start_date_str);
	cut_string(start_date_str, ':', 1);

	remove_whitespace(end_date_str);
	cut_string(end_date_str, ':', 1);
	
	sorted_insert(head, start_date_str, end_date_str, summary_str);

	free(start_date_str);
	free(end_date_str);
	free(summary_str);
}

// the unfolded string has a semicolon
// as a separator between what where previously separate lines
void unfolding_string(char* folded_string, char* unfolded_string) {
	int j = 0;
	for (int i = 0; i < strlen(folded_string); i++) {
		if (folded_string[i] == '\r' && folded_string[i+1] == '\n') {
			while (isblank(folded_string[i+2])) {
				i++;
				if (! isblank(folded_string[i+2]))
					folded_string[i+1] = ';';
			}
		} else {
			unfolded_string[j] = folded_string[i];
			j++;
		}
	}
}