#include "vxBoot/builtin.h"
#include "vxBoot/terminal.h"
#include "vxBoot/fs/smemfs.h"

#include <gint/bfile.h>

#include <string.h>

/* ls_help() : Display the hep message */
static void ls_help(void)
{
	terminal_write(
"NAME\n"
"    ls - list directory contents\n"
"\n"
"SYNOPSIS\n"
"    ls [-h|--help]\n"
"\n"
"DESCRIPTION\n"
"    List file information about FILEs (from the root directory only). The"
"    display is inspired from the utilitary `tree` in UNIX environment.\n"
"\n"
"    -h,--help\n"
"           Display this help message\n"
	);
}

/* inode_walk() : walk onto the filesystem and display files */
static void inode_walk(struct smemfs_inode *inode, int level, uint32_t bitmap)
{
	const char *records;

	if (inode == NULL)
		return;

	/* handle indentation */
	for (int i = 0; i < level; ++i) {
		records = "\t";
		if ((bitmap & (1 << i)) != 0)
			records = "|\t";
		terminal_write(records);
	}

	/* handle file name and sibling dependencies */
	records = "|-- (%x) %s";
	bitmap |= 1 << level;
	if (inode->sibling == NULL) {
		records = "`-- (%x) %s";
		bitmap &= ~(1 << level);
	}
	terminal_write(records, inode->type, inode->name);

	/* handle file type */
	if (inode->type == BFile_Type_Directory) {
		terminal_write(":\n");
		inode_walk(inode->child, level + 1, bitmap);
		inode_walk(inode->sibling, level, bitmap);
		return;
	}
	terminal_write("\n");
	inode_walk(inode->sibling, level, bitmap);
}

/* ls_main() : entry of the "ls" builtin */
int ls_main(int argc, char **argv)
{
	if (smemfs_superblock.fake_root_inode != SMEMFS_FAKE_ROOT_INODE) {
		terminal_write("smemfs not mounted !\n");
		return (84);
	}
	if (argc > 1 && strcmp(argv[1], "-help") == 0) {
		ls_help();
		return (0);
	}
	terminal_write("/:\n");
	inode_walk(smemfs_superblock.root_inode, 0, 0x00000000);
	return (0);
}