/*
 *  shell implementation for finsh shell.
 *
 * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
 *
 *  This file is part of RT-Thread (http://www.rt-thread.org)
 *  Maintainer: bernard.xiong <bernard.xiong at gmail.com>
 *
 *  All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-04-30     Bernard      the first version for FinSH
 * 2006-05-08     Bernard      change finsh thread stack to 2048
 * 2006-06-03     Bernard      add support for skyeye
 * 2006-09-24     Bernard      remove the code related with hardware
 * 2010-01-18     Bernard      fix down then up key bug.
 * 2010-03-19     Bernard      fix backspace issue and fix device read in shell.
 * 2010-04-01     Bernard      add prompt output when start and remove the empty history
 * 2011-02-23     Bernard      fix variable section end issue of finsh shell
 *                             initialization when use GNU GCC compiler.
 */

#include <rtthread.h>
#include <rthw.h>

#include "finsh.h"
#include "shell.h"

#ifdef FINSH_USING_MSH
#include "msh.h"
#endif

#ifdef _WIN32
#include <stdio.h> /* for putchar */
#endif

/* finsh thread */
static struct rt_thread finsh_thread;
ALIGN(RT_ALIGN_SIZE)
static char finsh_thread_stack[FINSH_THREAD_STACK_SIZE];
struct finsh_shell* shell;

#if !defined (RT_USING_NEWLIB) && !defined (RT_USING_MINILIBC)
int strcmp (const char *s1, const char *s2)
{
	while (*s1 && *s1 == *s2) s1++, s2++;

	return (*s1 - *s2);
}

#ifdef RT_USING_HEAP
char *strdup(const char *s)
{
	size_t len = strlen(s) + 1;
	char *tmp = (char *)rt_malloc(len);

	if(!tmp) return NULL;

	rt_memcpy(tmp, s, len);
	return tmp;
}
#endif

#endif

#if defined(RT_USING_DFS) && defined(DFS_USING_WORKDIR)
#include <dfs_posix.h>
const char* finsh_get_prompt()
{
	#define _PROMPT "finsh "
	static char finsh_prompt[RT_CONSOLEBUF_SIZE + 1] = {_PROMPT};
	
	/* get current working directory */
	getcwd(&finsh_prompt[6], RT_CONSOLEBUF_SIZE - 8);
	strcat(finsh_prompt, ">");

	return finsh_prompt;
}
#endif

static rt_err_t finsh_rx_ind(rt_device_t dev, rt_size_t size)
{
	RT_ASSERT(shell != RT_NULL);

	/* release semaphore to let finsh thread rx data */
	rt_sem_release(&shell->rx_sem);

	return RT_EOK;
}

/**
 * @ingroup finsh
 *
 * This function sets the input device of finsh shell.
 *
 * @param device_name the name of new input device.
 */
void finsh_set_device(const char* device_name)
{
	rt_device_t dev = RT_NULL;

	RT_ASSERT(shell != RT_NULL);
	dev = rt_device_find(device_name);
	if (dev != RT_NULL && rt_device_open(dev, RT_DEVICE_OFLAG_RDWR) == RT_EOK)
	{
		if (shell->device != RT_NULL)
		{
			/* close old finsh device */
			rt_device_close(shell->device);
		}

		shell->device = dev;
		rt_device_set_rx_indicate(dev, finsh_rx_ind);
	}
	else
	{
		rt_kprintf("finsh: can not find device:%s\n", device_name);
	}
}

/**
 * @ingroup finsh
 *
 * This function returns current finsh shell input device.
 *
 * @return the finsh shell input device name is returned.
 */
const char* finsh_get_device()
{
	RT_ASSERT(shell != RT_NULL);
	return shell->device->parent.name;
}

/**
 * @ingroup finsh
 *
 * This function set the echo mode of finsh shell.
 *
 * FINSH_OPTION_ECHO=0x01 is echo mode, other values are none-echo mode.
 *
 * @param echo the echo mode
 */
void finsh_set_echo(rt_uint32_t echo)
{
	RT_ASSERT(shell != RT_NULL);
	shell->echo_mode = (rt_uint8_t)echo;
}

/**
 * @ingroup finsh
 *
 * This function gets the echo mode of finsh shell.
 *
 * @return the echo mode
 */
rt_uint32_t finsh_get_echo()
{
	RT_ASSERT(shell != RT_NULL);

	return shell->echo_mode;
}

void finsh_auto_complete(char* prefix)
{
	extern void list_prefix(char* prefix);

	rt_kprintf("\n");
#ifdef FINSH_USING_MSH
	if (msh_is_used() == RT_TRUE)
	{
		msh_auto_complete(prefix);
	}
	else 
#endif
	{
		list_prefix(prefix);
	}

	rt_kprintf("%s%s", FINSH_PROMPT, prefix);
}

void finsh_run_line(struct finsh_parser* parser, const char *line)
{
	const char* err_str;

	rt_kprintf("\n");
	finsh_parser_run(parser, (unsigned char*)line);

	/* compile node root */
	if (finsh_errno() == 0)
	{
		finsh_compiler_run(parser->root);
	}
	else
	{
		err_str = finsh_error_string(finsh_errno());
		rt_kprintf("%s\n", err_str);
	}

	/* run virtual machine */
	if (finsh_errno() == 0)
	{
		char ch;
		finsh_vm_run();

		ch = (unsigned char)finsh_stack_bottom();
		if (ch > 0x20 && ch < 0x7e)
		{
			rt_kprintf("\t'%c', %d, 0x%08x\n",
				(unsigned char)finsh_stack_bottom(),
				(unsigned int)finsh_stack_bottom(),
				(unsigned int)finsh_stack_bottom());
		}
		else
		{
			rt_kprintf("\t%d, 0x%08x\n",
				(unsigned int)finsh_stack_bottom(),
				(unsigned int)finsh_stack_bottom());
		}
	}

    finsh_flush(parser);
}

#ifdef FINSH_USING_HISTORY
rt_bool_t finsh_handle_history(struct finsh_shell* shell, char ch)
{
	/*
	 * handle up and down key
	 * up key  : 0x1b 0x5b 0x41
	 * down key: 0x1b 0x5b 0x42
	 */
	if (ch == 0x1b)
	{
		shell->stat = WAIT_SPEC_KEY;
		return RT_TRUE;
	}

	if ((shell->stat == WAIT_SPEC_KEY))
	{
		if (ch == 0x5b)
		{
			shell->stat = WAIT_FUNC_KEY;
			return RT_TRUE;
		}

		shell->stat = WAIT_NORMAL;
		return RT_FALSE;
	}

	if (shell->stat == WAIT_FUNC_KEY)
	{
		shell->stat = WAIT_NORMAL;

		if (ch == 0x41) /* up key */
		{
			/* prev history */
			if (shell->current_history > 0)shell->current_history --;
			else
			{
				shell->current_history = 0;
				return RT_TRUE;
			}

			/* copy the history command */
			memcpy(shell->line, &shell->cmd_history[shell->current_history][0],
				FINSH_CMD_SIZE);
			shell->line_position = strlen(shell->line);
			shell->use_history = 1;
		}
		else if (ch == 0x42) /* down key */
		{
			/* next history */
			if (shell->current_history < shell->history_count - 1)
				shell->current_history ++;
			else
			{
				/* set to the end of history */
				if (shell->history_count != 0)
				{
					shell->current_history = shell->history_count - 1;
				}
				else return RT_TRUE;
			}

			memcpy(shell->line, &shell->cmd_history[shell->current_history][0],
				FINSH_CMD_SIZE);
			shell->line_position = strlen(shell->line);
			shell->use_history = 1;
		}

		if (shell->use_history)
		{
#if defined(_WIN32)
			int i;
			rt_kprintf("\r");

			for(i=0; i<= 60; i++)
				putchar(' ');
			rt_kprintf("\r");

#else
			rt_kprintf("\033[2K\r");
#endif
			rt_kprintf("%s%s", FINSH_PROMPT, shell->line);
			return RT_TRUE;;
		}
	}

	return RT_FALSE;
}

void finsh_push_history(struct finsh_shell* shell)
{
	if ((shell->use_history == 0) && (shell->line_position != 0))
	{
		/* push history */
		if (shell->history_count >= FINSH_HISTORY_LINES)
		{
			/* move history */
			int index;
			for (index = 0; index < FINSH_HISTORY_LINES - 1; index ++)
			{
				memcpy(&shell->cmd_history[index][0],
					&shell->cmd_history[index + 1][0], FINSH_CMD_SIZE);
			}
			memset(&shell->cmd_history[index][0], 0, FINSH_CMD_SIZE);
			memcpy(&shell->cmd_history[index][0], shell->line, shell->line_position);

			/* it's the maximum history */
			shell->history_count = FINSH_HISTORY_LINES;
		}
		else
		{
			memset(&shell->cmd_history[shell->history_count][0], 0, FINSH_CMD_SIZE);
			memcpy(&shell->cmd_history[shell->history_count][0], shell->line, shell->line_position);

			/* increase count and set current history position */
			shell->history_count ++;
		}
	}
	shell->current_history = shell->history_count;
}
#endif

#ifndef RT_USING_HEAP
struct finsh_shell _shell;
#endif
void finsh_thread_entry(void* parameter)
{
    char ch;

	/* normal is echo mode */
	shell->echo_mode = 1;

    finsh_init(&shell->parser);
	rt_kprintf(FINSH_PROMPT);

	while (1)
	{
		/* wait receive */
		if (rt_sem_take(&shell->rx_sem, RT_WAITING_FOREVER) != RT_EOK) continue;

		/* read one character from device */
		while (rt_device_read(shell->device, 0, &ch, 1) == 1)
		{
			/* handle history key */
			#ifdef FINSH_USING_HISTORY
			if (finsh_handle_history(shell, ch) == RT_TRUE) continue;
			#endif

			/* handle CR key */
			if (ch == '\r')
			{
				char next;

				if (rt_device_read(shell->device, 0, &next, 1) == 1)
					ch = next;
				else ch = '\r';
			}
			/* handle tab key */
			else if (ch == '\t')
			{
				/* auto complete */
				finsh_auto_complete(&shell->line[0]);
				/* re-calculate position */
				shell->line_position = strlen(shell->line);
				continue;
			}
			/* handle backspace key */
			else if (ch == 0x7f || ch == 0x08)
			{
				if (shell->line_position != 0)
				{
					rt_kprintf("%c %c", ch, ch);
				}
				if (shell->line_position <= 0) shell->line_position = 0;
				else shell->line_position --;
				shell->line[shell->line_position] = 0;
				continue;
			}

			/* handle end of line, break */
			if (ch == '\r' || ch == '\n')
			{
#ifdef FINSH_USING_MSH
				if (msh_is_used() == RT_TRUE && shell->line_position != 0)
				{
					rt_kprintf("\n");
					msh_exec(shell->line, shell->line_position);
					#ifdef FINSH_USING_HISTORY
					finsh_push_history(shell);
					#endif
				}
				else
#endif
				{
					/* add ';' and run the command line */
					shell->line[shell->line_position] = ';';

					#ifdef FINSH_USING_HISTORY
					finsh_push_history(shell);
					#endif

					if (shell->line_position != 0) finsh_run_line(&shell->parser, shell->line);
					else rt_kprintf("\n");
				}

				rt_kprintf(FINSH_PROMPT);
				memset(shell->line, 0, sizeof(shell->line));
				shell->line_position = 0;

				break;
			}

			/* it's a large line, discard it */
			if (shell->line_position >= FINSH_CMD_SIZE) shell->line_position = 0;

			/* normal character */
			shell->line[shell->line_position] = ch; ch = 0;
			if (shell->echo_mode) rt_kprintf("%c", shell->line[shell->line_position]);
			shell->line_position ++;
			shell->use_history = 0; /* it's a new command */
		} /* end of device read */
	}
}

void finsh_system_function_init(const void* begin, const void* end)
{
	_syscall_table_begin = (struct finsh_syscall*) begin;
	_syscall_table_end = (struct finsh_syscall*) end;
}

void finsh_system_var_init(const void* begin, const void* end)
{
	_sysvar_table_begin = (struct finsh_sysvar*) begin;
	_sysvar_table_end = (struct finsh_sysvar*) end;
}

#if defined(__ICCARM__)               /* for IAR compiler */
  #ifdef FINSH_USING_SYMTAB
    #pragma section="FSymTab"
    #pragma section="VSymTab"
  #endif
#elif defined(__ADSPBLACKFIN__) /* for VisaulDSP++ Compiler*/
  #ifdef FINSH_USING_SYMTAB
    extern "asm" int __fsymtab_start;
    extern "asm" int __fsymtab_end;
    extern "asm" int __vsymtab_start;
    extern "asm" int __vsymtab_end;
  #endif
#elif defined(_MSC_VER)
#pragma section("FSymTab$a", read)
const char __fsym_begin_name[] = "__start";
const char __fsym_begin_desc[] = "begin of finsh";
__declspec(allocate("FSymTab$a")) const struct finsh_syscall __fsym_begin = 
{
	__fsym_begin_name,
	__fsym_begin_desc,
	NULL
};

#pragma section("FSymTab$z", read)
const char __fsym_end_name[] = "__end";
const char __fsym_end_desc[] = "end of finsh";
__declspec(allocate("FSymTab$z")) const struct finsh_syscall __fsym_end = 
{
	__fsym_end_name,
	__fsym_end_desc,
	NULL
};
#endif

/*
 * @ingroup finsh
 *
 * This function will initialize finsh shell
 */
void finsh_system_init(void)
{
	rt_err_t result;

#ifdef FINSH_USING_SYMTAB
#ifdef __CC_ARM                 /* ARM C Compiler */
    extern const int FSymTab$$Base;
    extern const int FSymTab$$Limit;
    extern const int VSymTab$$Base;
    extern const int VSymTab$$Limit;
	finsh_system_function_init(&FSymTab$$Base, &FSymTab$$Limit);
	finsh_system_var_init(&VSymTab$$Base, &VSymTab$$Limit);
#elif defined (__ICCARM__)      /* for IAR Compiler */
    finsh_system_function_init(__section_begin("FSymTab"),
                               __section_end("FSymTab"));
    finsh_system_var_init(__section_begin("VSymTab"),
                          __section_end("VSymTab"));
#elif defined (__GNUC__)        /* GNU GCC Compiler */
	extern const int __fsymtab_start;
	extern const int __fsymtab_end;
	extern const int __vsymtab_start;
	extern const int __vsymtab_end;
	finsh_system_function_init(&__fsymtab_start, &__fsymtab_end);
	finsh_system_var_init(&__vsymtab_start, &__vsymtab_end);
#elif defined(__ADSPBLACKFIN__) /* for VisualDSP++ Compiler */
    finsh_system_function_init(&__fsymtab_start, &__fsymtab_end);
    finsh_system_var_init(&__vsymtab_start, &__vsymtab_end);
#elif defined(_MSC_VER)
	unsigned int *ptr_begin, *ptr_end;

	ptr_begin = (unsigned int*)&__fsym_begin; ptr_begin += (sizeof(struct finsh_syscall)/sizeof(unsigned int));
	while (*ptr_begin == 0) ptr_begin ++;

	ptr_end = (unsigned int*) &__fsym_end; ptr_end --;
	while (*ptr_end == 0) ptr_end --;

	finsh_system_function_init(ptr_begin, ptr_end);
#endif
#endif

	/* create or set shell structure */
#ifdef RT_USING_HEAP
	shell = (struct finsh_shell*)rt_malloc(sizeof(struct finsh_shell));
#else
	shell = &_shell;
#endif
	if (shell == RT_NULL)
	{
		rt_kprintf("no memory for shell\n");
		return;
	}
	
	memset(shell, 0, sizeof(struct finsh_shell));

	rt_sem_init(&(shell->rx_sem), "shrx", 0, 0);
	result = rt_thread_init(&finsh_thread,
		"tshell",
		finsh_thread_entry, RT_NULL,
		&finsh_thread_stack[0], sizeof(finsh_thread_stack),
		FINSH_THREAD_PRIORITY, 10);

	if (result == RT_EOK)
		rt_thread_startup(&finsh_thread);
}