#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <conio.h>

typedef struct wpis {
	char* time;
	char* data;
	char* tags;
} wpis;

typedef struct node {
	wpis* w;
	struct node* next;
} node;

void read(char** target, char stop, FILE* in) {
	static char word[2048];
	int i = 0;
	char c;
	while ((c = getc(in)) != stop && c != EOF)
		word[i++] = c;
	word[i] = 0;
	int len = strlen(word);
	*target = (char*)malloc((len + 1) * sizeof(char));
	strcpy(*target, word);
}

void add(node* list) {
	wpis* w = (wpis*) malloc(sizeof(wpis));
	read(&w->time, ';', stdin);
	read(&w->data, ';', stdin);
	read(&w->tags, '\n', stdin);
	node* tmp = (node*)malloc(sizeof(node));
	tmp->next = list->next;
	tmp->w = w;
	list->next = tmp;
}

void print_all(node* root, FILE* out) {
	node* iter = root->next;
	while (iter != NULL) {
		wpis* w = iter->w;
		fprintf(out, "\n%s;%s;%s", w->time, w->data, w->tags);
		iter = iter->next;
	}
}

void save(node* root) {
	FILE* data = fopen("data.db", "w");
	print_all(root, data);
	fclose(data);
}

void read_from_file(node* list) {
	FILE* data = fopen("data.db", "r");
	if (data == NULL) return;
	getc(data);
	while (!feof(data)) {
		wpis* w = (wpis*) malloc(sizeof(wpis));
		read(&w->time, ';', data);
		read(&w->data, ';', data);
		read(&w->tags, '\n', data);
		node* tmp = (node*)malloc(sizeof(node));
		tmp->w = w;
		list->next = tmp;
		list = tmp;
		tmp->next = NULL;
	}
	fclose(data);
}

void show_all(node* root) {
	print_all(root, stdout);
	printf("\n");
}

void print_menu() {
	printf("1. Add\n");
	printf("2. Show All\n");
	printf("3. Show Tag\n");
	printf("4. Quit and save\n");
}

void show_tag(node* root, char* tag) {
	node* iter = root->next;
	while (iter != NULL) {
		wpis* w = iter->w;
		char* res = strstr(w->tags, tag);
		if (res != NULL) {
			printf("%s;%s;%s\n", w->time, w->data, w->tags);
		}
		iter = iter->next;
	}
}

bool file_exist() {
	FILE *file;
	if (file = fopen("data.db", "r")) {
		fclose(file);
		return true;
	}
	return false;
}

int main() {
	node* list = (node*) malloc(sizeof(node));
	list->next = NULL;
	read_from_file(list);

	bool run = true;
	while (run) {
		print_menu();
		int dec;
		scanf("%d", &dec);
		while (getchar() != '\n');
		if (dec == 1) {
			add(list);
			save(list);
			system("cls");
		}
		else if (dec == 2) {
			show_all(list);
			getchar();
			system("cls");
		}
		else if (dec == 3) {
			char* tag;
			read(&tag, '\n', stdin);
			show_tag(list, tag);
			getchar();
			system("cls");
		}
		else if (dec == 4) break;
	}

	save(list);
}