#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "defines.h"

char* text(char *path, unsigned long *file_size);

char* get_mimetype(char *path){
	static char *cmd_str = "file --mime-type -b ./\"";
	unsigned long cmd_len = strlen(cmd_str);
	unsigned int path_len = strlen(path);

	char *cmd = malloc((cmd_len + path_len) + 2);
	memset(cmd, ' ', cmd_len + path_len);
	memcpy(cmd, cmd_str, cmd_len);
	memcpy(cmd + cmd_len, path, path_len);
	cmd[cmd_len + path_len] = '\"';
	cmd[cmd_len + path_len + 1] = '\0';

	FILE *cmd_open = popen(cmd, "r");
	char *line;
	size_t size = 0;
	getline(&line, &size, cmd_open);
	pclose(cmd_open);
	return line;
}
char* preview_file(char *path, unsigned long file_size){ 
	/* this calls "file" on path */

	char *file_buffer;


	char *mime = get_mimetype(path);

	unsigned int mime_len = strlen(mime);

	if (strstr(mime, "text")) {
		file_buffer = text(path, &file_size);
	} else {

		file_buffer = malloc(mime_len + 1);
		memset(file_buffer, ' ', mime_len);
		memcpy(file_buffer, mime, mime_len);
		file_buffer[mime_len] = '\0';
	}
	free(mime);
	return file_buffer;

}



char* text(char *path, unsigned long *file_size){

	char *file_buffer = malloc(*file_size + 1);
	FILE *fp = fopen(path, "r");
	fread(file_buffer, *file_size, 1, fp);
	file_buffer[*file_size] = '\0';

	return file_buffer;
}