#ifndef __CMD_H
#define __CMD_H

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#include "debug.h"
#include "queue.h"

#define CMDT_NONE   0
#define CMDT_INT    1
#define CMDT_HEX    2
#define CMDT_BIN    3
#define CMDT_QSTR   4
#define CMDT_STR    5
#define CMDT_WORD   6
#define CMDT_SP     7

#define CMDE_NONE         0 //do nothing
#define CMDE_AUTOCOMPLETE 1 //try to auto complete first command
#define CMDE_ALIAS        2 //command aliases

#define CMD_EOK  0   //all ok
#define CMD_EEXE 1   //command execution error
#define CMD_ECMD 2   //unknown command

#define CMD_HISTORY_SIZE 16 //fixed size history

/*
Arch

[CLI]------->[PARSE]
[FILE]----/

[PARSE]-------->[[EXEC]->[HISTORY] other extra features]
[CMDLIST]----/
*/

/*
Token list that comes from parser
*/

typedef struct cmd_tok_t
{
	char             *s,*e;
	int               sz;
	int               type;
	struct cmd_tok_t *next;
} cmd_tok_t;

/*
Argument list passed to callback cmd functions
*/

typedef struct cmd_arg_t
{
	int    argc;
	char **argv;
	int   *type;

	/* bad practice stuff */
	int    __sub_cmd; // if 1 then dont free argv stuff
} cmd_arg_t;

/*
Table of defined commands
*/

typedef struct cmd_table_t
{
	char *cmd;
	int (*clb)(cmd_arg_t*); //callback to command
	int (*hlp)(cmd_arg_t*); //help command
	int (*pre)(cmd_arg_t*); //preconditions for execution
	int (*autocpl)(cmd_arg_t*); //autocomplete according to context
} cmd_table_t;

/*
autocomplete suggestions from command list. Used for autcomplet "<TAB>"
*/
struct cmd_acq_t
{
	char *suggestion;
	SLIST_ENTRY(cmd_acq_t) next_sugg;
};
SLIST_HEAD(cmd_acq_head_t,cmd_acq_t);

/*
Contain all non cli parsing execution things.
Manage history and logging
Manage command loading from file
Manage autocomplete
*/
typedef struct cmd_mng_t
{
	int  flag_history;
	/*simple que*/
	int  history_size;
	char *history[CMD_HISTORY_SIZE];
	
	//not yet ready
	//int flag_logging;

	// flag turn on/off autocomplete
	int flag_autocomplete;
	
	cmd_table_t *table;
} cmd_mng_t;

cmd_tok_t* cmd_tok_create(  char *s, char *e, int sz, int type );
int        cmd_tok_add( cmd_tok_t *tok, cmd_tok_t *next );
int        cmd_tok_print( cmd_tok_t *tok );
void       cmd_tok_destroy( cmd_tok_t *tok ); //clean token by ->next token
int        cmd_tok_count( cmd_tok_t *tok );

cmd_arg_t* cmd_arg_create(  cmd_tok_t *tok );
cmd_arg_t* cmd_arg_sub( cmd_arg_t *arg ); //just return without first arg
cmd_arg_t* cmd_arg_sub_empty();
void       cmd_arg_destroy( cmd_arg_t *arg );

int        cmd_exec( cmd_table_t *tbl, cmd_arg_t *arg );
int        cmd_exec_ev( cmd_table_t *tbl, cmd_arg_t *arg, int event ); //auto complete and all other
char*      cmd_ac( cmd_table_t *tbl, const char *s ); //autocomplete
struct cmd_acq_head_t* cmd_acq( cmd_table_t *tbl, const char *s ); //autocomplete
void       cmd_acq_free( struct cmd_acq_head_t *acq );

/*
If history is on.
PARAM:
	cmng  - cli manager
	index - index value in history
RETURN:
	return non-NULL value if there something
*/
char* cmd_mng_history( cmd_mng_t *cmng, int index );

/*
PARAM:
	cmng
	cmd   - non complete command, not to execute, seach for suggestions
RETURN:
	[FREE] return string list of autocomplete commands
*/
char* cmd_mng_autocomplete( cmd_mng_t *cmng, char *cmd, size_t cmd_sz );
/*
PARAM:
	cmng
	cmd   -  command to execute expect NULL at the end
RETURN:
	return  result of execution
*/
int   cmd_mng_exec( cmd_mng_t *cmng, const char *cmd, size_t sz_cmd );
/*
Free resources that where givent to cmd manager, like history
*/
int   cmd_mng_free( cmd_mng_t *cmng);


#define STR_AC_EQ(A,B)  (strncmp_ac((A),(B),strlen(A))==(strlen(A)+1))
#define STR_AC_PEQ(A,B) (strncmp_ac((A),(B),strlen(A))<(strlen(A)))

/*
Clothest match function
AA AB  = (1) equile <100%
AA AA  = (3) equite 100% 
AA AAA = (2) equile 100% but there is more
A  B   = (0) not equile at all
*/
int strncmp_ac( const char *s1, const char *s2, const int n);

#endif