#include <stdio.h>
#include "vmp.h"

int main(int argc, char** argv)
{

	/* Get input and output file name */
	if (argc != 2) {
		error("Usage: vmp <INPUT_FILE_NAME>\n", NO_ARG);
	}

	const char* in_file_name = argv[1];
	if (sizeof(in_file_name) <= 3) {
		error("File name is too short\n",IN_NAME_TOO_SHORT);
	}

	run(in_file_name);
	return 0;
}

void error(const char* msg, int code) {
	printf("%s", msg);
	exit(code);
}

void run(const char* in_file_name) {
	FILE* fd = fopen(in_file_name, "r");
	if (!fd) {
		error("Cannot open input file.\n", CANNOT_OPEN_FILE);
       	}

	char line[1024];
	while(fgets(line, sizeof(line), fd) != NULL) {
		int len = strlen(line);
		while (len > 0 && isspace(line[len - 1])) {
			line[--len] = '\0';
		}

		parse_and_output(line);
	}

	fclose(fd);
}

void parse_head(const char* line) {
	int level = 0;
	size_t i = 0;

	while(line[i] == '#' && i < strlen(line)) {
		level++;
		i++;
	}

	if (i < strlen(line) && line[i] == ' ' && level <=6 ) {
		printf("<h%d>", level);

		int start = i;
		int length = strlen(line);
		char head_text[512];
		strncpy(head_text, line + start + 1, length);

		printf("%s", head_text);
		printf("</h%d>", level);
	} else {
		int start = i;
		int length = strlen(line);
		char head_text[512];
		strncpy(head_text, line + start + 1, length);

		printf("%s", head_text);		
	}
}

void parse_and_output(const char* line) {
	int in_empty_line = 0;

	/* Empty */
	if (strcmp(line, "") == 0) {
		printf("<br>\n");
		in_empty_line = 1;
	} else {
		in_empty_line = 0;
		char line_head = line[0];

		if (line_head == '#') {
			parse_head(line);
		} else if (strcmp(line, "---") == 0) {
			printf("<hr>\n");
		}
	} 
}