/*******************************************************************************
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*******************************************************************************/
/* includes */

#include "command.h"
#include "mvUart.h"
#include "lib_utils.h"
#include "printf.h"

int do_help(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_md(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_mw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_mm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_cmp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_cp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int ir_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int training_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_mtest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);

/* Commands Table
 * Every new command is added here, Thus it must be declared in
 * this file, or include the file declaring it
 * For example, To add new command that is implemented in 'hello_world' function
 * this line is added to the declaration:
 *	{ "hello", 2, hello_world, "prints hello world", ""}
 */
cmd_tbl_t commands[] = {
	{ "?", 2, do_help, "prints help message of command", "command-name"},
	{ "md", 3, do_mem_md, "memory display", "[.b, .w, .l] address [# of objects]"},
	{ "mw",	4, do_mem_mw, "memory write (fill)", "[.b, .w, .l] address value [count]"},
	{ "mm",	2, do_mem_mm, "memory modify (auto-incrementing address)", "[.b, .w, .l] address"},
	{ "cmp", 4, do_mem_cmp, "memory compare", "[.b, .w, .l] addr1 addr2 count"},
	{ "cp", 4, do_mem_cp, "memory copy", "[.b, .w, .l] source target count"},
	{ "ir", 2, ir_cmd, "ir	- reading and changing MV internal register values.\n", "address"},
	{ "training", 1, training_cmd, "training	- prints the results of the DDR3 Training.\n"},
	{ "mtest", 5, do_mem_mtest, "simple RAM read/write test", "[start [end [pattern [iterations]]]]"}
};

/* local functions definitions */
cmd_tbl_t *find_cmd(const char *cmd);
void cmd_usage(const cmd_tbl_t *cmdtp);

/*******************************************************************************
* do_help
*
* DESCRIPTION:
* Command that prints the help message of commands
*
*******************************************************************************/
int do_help(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	cmd_tbl_t *cmd;

	if (argc <= 1)
		return 0;

	cmd = find_cmd(argv[1]);
	if (cmd == NULL) {
		mvPrintf("Command not found");
		return 0;
	}

	cmd_usage(cmd);
	return 0;
}

int do_mem_md(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_mw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_mm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_cmp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_cp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int ir_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int training_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
int do_mem_mtest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);

/*******************************************************************************
* cmd_get_data_size
*
* DESCRIPTION:
* Check for a size specification .b, .w or .l.
*
* INPUT:
*	arg		- command (e.g. "mw.l")
*	default_size	- default size to return if no size was specified
*
* RETURN:
*	if size was specified, return corresponding size
*		(.b = 1, .w = 2, .l = 4)
*	otherwise, return default_size
*
*******************************************************************************/
int cmd_get_data_size(char *arg, int default_size)
{
	int len = strlen(arg);
	if (len > 2 && arg[len-2] == '.') {
		switch (arg[len-1]) {
		case 'b':
			return 1;
		case 'w':
			return 2;
		case 'l':
			return 4;
		case 's':
			return -2;
		default:
			return -1;
		}
	}
	return default_size;
}

/*******************************************************************************
* find_cmd_tbl
*
* DESCRIPTION:
* search for command in command table
*
* INPUT:
*	cmd		- command (e.g. "ir")
*	table		- commands table
*	table_len	- commands table length
*
* RETURN:
*	if command was found, cmd_tbl_t entry corresponding the command
*	otherwise, NULL
*
*******************************************************************************/
cmd_tbl_t *find_cmd_tbl(const char *cmd, cmd_tbl_t *table, int table_len)
{
	cmd_tbl_t *cmdtp;
	cmd_tbl_t *cmdtp_temp = table;	/*Init value */
	const char *p;
	int len;
	int n_found = 0;

	if (!cmd)
		return NULL;
	/*
	 * Some commands allow length modifiers (like "cp.b");
	 * compare command name only until first dot.
	 */
	len = ((p = strchr(cmd, '.')) == NULL) ? strlen(cmd) : (p - cmd);

	for (cmdtp = table;
	     cmdtp != table + table_len;
	     cmdtp++) {
		if (strncmp(cmd, cmdtp->name, len) == 0) {
			if (len == strlen(cmdtp->name))
				return cmdtp;	/* full match */

			cmdtp_temp = cmdtp;	/* abbreviated command ? */
			n_found++;
		}
	}
	if (n_found == 1) {			/* exactly one match */
		return cmdtp_temp;
	}

	return NULL;	/* not found or ambiguous command */
}

/*******************************************************************************
* find_cmd
*
* DESCRIPTION:
* wrapper function for 'find_cmd_tbl'
*
*******************************************************************************/
cmd_tbl_t *find_cmd(const char *cmd)
{
	return find_cmd_tbl(cmd, commands, sizeof(commands)/sizeof(struct cmd_tbl_s));
}

static int cmd_call(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int result;

	result = (cmdtp->cmd)(cmdtp, flag, argc, argv);
	return result;
}

/*******************************************************************************
* cmd_usage
*
* DESCRIPTION:
* prints the help message of the command
*
* INPUT:
*	cmdtp	- command entry pointer
*
*
*******************************************************************************/
void cmd_usage(const cmd_tbl_t *cmdtp)
{
	mvPrintf("%s - %s\n\n", cmdtp->name, cmdtp->usage);
	mvPrintf("Usage:\n%s ", cmdtp->name);

	if (!cmdtp->help)
		return;

	mvPrintf("%s\n", cmdtp->help);
}

/*******************************************************************************
* cmd_process
*
* DESCRIPTION:
* search for command in command table and run it
*
* INPUT:
*	flag	- command flag
*	argc	- number of arguments
*	argv	- arguments array
*
* RETURN:
*	CMD_RET_SUCCESS(0), if command was ran successfully
*	CMD_RET_FAILURE(1), on failure
*	CMD_RET_USAGE(-1), on failure and need to print help message (future use)
*
*
*******************************************************************************/
enum command_ret_t cmd_process(int flag, int argc, char * const argv[])
{
	enum command_ret_t rc = CMD_RET_SUCCESS;
	cmd_tbl_t *cmdtp;

	/* Look up command in command table */
	cmdtp = find_cmd(argv[0]);
	if (cmdtp == NULL) {
		putstring("Unknown command\n");
		return 1;
	}

	/* found - check max args */
	if (argc > cmdtp->maxargs)
		rc = CMD_RET_USAGE;


	/* If OK so far, then do the command */
	if (!rc)
		rc = cmd_call(cmdtp, flag, argc, argv);

	if (rc == CMD_RET_USAGE)
		cmd_usage(cmdtp);

	return rc;
}

/*******************************************************************************
* parse_line
*
* DESCRIPTION:
* parse command and store arguments in argv
*
* INPUT:
*	line	- pointer to the beginning of the command string
*
* OUTPUT:
*	argv	- output array of the parsed arguments
*
* RETURN:
*	number of arguments
*
*******************************************************************************/
int parse_line(char *line, char *argv[])
{
	int nargs = 0;

	while (nargs < CONFIG_SYS_MAXARGS) {

		/* skip any white space */
		while (isblank1(*line))
			++line;

		if (*line == '\0') {	/* end of line, no more args	*/
			argv[nargs] = NULL;
			return nargs;
		}

		argv[nargs++] = line;	/* begin of argument string	*/

		/* find end of string */
		while (*line && !isblank1(*line))
			++line;

		if (*line == '\0') {	/* end of line, no more args	*/
			argv[nargs] = NULL;
			return nargs;
		}

		*line++ = '\0';		/* terminate current arg	 */
	}

	putstring("** Too many args **\n");

	return nargs;
}

/*******************************************************************************
* run_command
*
* DESCRIPTION:
* runs input command
*
* INPUT:
*	cmd	- input command string to run (including parameters).
*	flag	- command flag
*
*******************************************************************************/
void run_command(const char *cmd, int flag)
{
	char cmdbuf[CONFIG_SYS_CBSIZE];	/* working copy of cmd		*/
	char *token;			/* start of token in cmdbuf	*/
	char *sep;			/* end of token (separator) in cmdbuf */
	char *str = cmdbuf;
	char *argv[CONFIG_SYS_MAXARGS + 1];	/* NULL terminated	*/
	int argc, inquotes;

	if (!cmd || !*cmd)
		return;	/* empty command */

	if (strlen(cmd) >= CONFIG_SYS_CBSIZE) {
		putstring("## Command too long!\n");
		return;
	}

	strcpy(cmdbuf, cmd);

	/* Process separators */

	while (*str) {

		/*
		 * Find separator, or string end
		 * Allow simple escape of ';' by writing "\;"
		 */
		for (inquotes = 0, sep = str; *sep; sep++) {
			if ((*sep == '\'') &&
			    (*(sep - 1) != '\\'))
				inquotes = !inquotes;

			if (!inquotes &&
			    (*sep == ';') &&	/* separator		*/
			    (sep != str) &&	/* past string start	*/
			    (*(sep-1) != '\\'))	/* and NOT escaped	*/
				break;
		}

		/*
		 * Limit the token to data between separators
		 */
		token = str;
		if (*sep) {
			str = sep + 1;	/* start of command for next pass */
			*sep = '\0';
		} else
			str = sep;	/* no more commands for next pass */

		/* Extract arguments */
		argc = parse_line(token, argv);
		if (argc == 0)
			continue;

		cmd_process(flag, argc, argv);
	}
}