/*
 *  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 <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(FINSH_USING_MSH) || (defined(RT_USING_DFS) && defined(DFS_USING_WORKDIR))
#if defined(RT_USING_DFS)
#include <dfs_posix.h>
#endif
const char* finsh_get_prompt()
{
    #define _MSH_PROMPT "msh "
    #define _PROMPT 	"finsh "
    static char finsh_prompt[RT_CONSOLEBUF_SIZE + 1] = {0};

#ifdef FINSH_USING_MSH
    if (msh_is_used()) strcpy(finsh_prompt, _MSH_PROMPT);
    else
#endif
    strcpy(finsh_prompt, _PROMPT);

#ifdef DFS_USING_WORKDIR
    /* get current working directory */
    getcwd(&finsh_prompt[rt_strlen(finsh_prompt)], RT_CONSOLEBUF_SIZE - rt_strlen(finsh_prompt));
#endif
    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_kprintf("finsh: can not find device: %s\n", device_name);
        return;
    }

    /* check whether it's a same device */
    if (dev == shell->device) return;
    /* open this device and set the new device in finsh shell */
    if (rt_device_open(dev, RT_DEVICE_OFLAG_RDWR) == RT_EOK)
    {
        if (shell->device != RT_NULL)
        {
            /* close old finsh device */
            rt_device_close(shell->device);
            rt_device_set_rx_indicate(dev, RT_NULL);
        }

        shell->device = dev;
        rt_device_set_rx_indicate(dev, finsh_rx_ind);
    }
}

/**
 * @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;
}

static void shell_auto_complete(char* prefix)
{

    rt_kprintf("\n");
#ifdef FINSH_USING_MSH
    if (msh_is_used() == RT_TRUE)
    {
        msh_auto_complete(prefix);
    }
    else 
#endif
    {
#ifndef FINSH_USING_MSH_ONLY        
        extern void list_prefix(char* prefix);
        list_prefix(prefix);
#endif
    }

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

#ifndef FINSH_USING_MSH_ONLY
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);
}
#endif

#ifdef FINSH_USING_HISTORY
static rt_bool_t shell_handle_history(struct finsh_shell* shell)
{
#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_FALSE;
}

static void shell_push_history(struct finsh_shell* shell)
{
    if (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;

#ifndef FINSH_USING_MSH_ONLY
    finsh_init(&shell->parser);
#endif
    rt_kprintf(FINSH_PROMPT);

    /* set console device as shell device */
    if (shell->device == RT_NULL)
    {
#ifdef RT_USING_CONSOLE
        shell->device = rt_console_get_device();
        RT_ASSERT(shell->device);
        rt_device_open(shell->device, RT_DEVICE_OFLAG_RDWR);
        rt_device_set_rx_indicate(shell->device, finsh_rx_ind);
#else
        RT_ASSERT(shell->device);
#endif
    }

    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 control key
             * up key  : 0x1b 0x5b 0x41
             * down key: 0x1b 0x5b 0x42
             * right key:0x1b 0x5b 0x43
             * left key: 0x1b 0x5b 0x44
             */
            if (ch == 0x1b)
            {
                shell->stat = WAIT_SPEC_KEY;
                continue;
            }
            else if (shell->stat == WAIT_SPEC_KEY)
            {
                if (ch == 0x5b)
                {
                    shell->stat = WAIT_FUNC_KEY;
                    continue;
                }

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

                if (ch == 0x41) /* up key */
                {
#ifdef FINSH_USING_HISTORY
                    /* prev history */
                    if (shell->current_history > 0)
                        shell->current_history --;
                    else
                    {
                        shell->current_history = 0;
                        continue;
                    }

                    /* copy the history command */
                    memcpy(shell->line, &shell->cmd_history[shell->current_history][0],
                           FINSH_CMD_SIZE);
                    shell->line_curpos = shell->line_position = strlen(shell->line);
                    shell_handle_history(shell);
#endif
                    continue;
                }
                else if (ch == 0x42) /* down key */
                {
#ifdef FINSH_USING_HISTORY
                    /* 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
                            continue;
                    }

                    memcpy(shell->line, &shell->cmd_history[shell->current_history][0],
                           FINSH_CMD_SIZE);
                    shell->line_curpos = shell->line_position = strlen(shell->line);
                    shell_handle_history(shell);
#endif
                    continue;
                }
                else if (ch == 0x44) /* left key */
                {
                    if (shell->line_curpos)
                    {
                        rt_kprintf("\b");
                        shell->line_curpos --;
                    }

                    continue;
                }
                else if (ch == 0x43) /* right key */
                {
                    if (shell->line_curpos < shell->line_position)
                    {
                        rt_kprintf("%c", shell->line[shell->line_curpos]);
                        shell->line_curpos ++;
                    }

                    continue;
                }

            }

            /* 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')
            {
                int i;
                /* move the cursor to the beginning of line */
                for (i = 0; i < shell->line_curpos; i++)
                    rt_kprintf("\b");

                /* auto complete */
                shell_auto_complete(&shell->line[0]);
                /* re-calculate position */
                shell->line_curpos = shell->line_position = strlen(shell->line);

                continue;
            }
            /* handle backspace key */
            else if (ch == 0x7f || ch == 0x08)
            {
                /* note that shell->line_curpos >= 0 */
                if (shell->line_curpos == 0)
                    continue;

                shell->line_position--;
                shell->line_curpos--;

                if (shell->line_position > shell->line_curpos)
                {
                    int i;

                    rt_memmove(&shell->line[shell->line_curpos],
                               &shell->line[shell->line_curpos + 1],
                               shell->line_position - shell->line_curpos);
                    shell->line[shell->line_position] = 0;

                    rt_kprintf("\b%s  \b", &shell->line[shell->line_curpos]);

                    /* move the cursor to the origin position */
                    for (i = shell->line_curpos; i <= shell->line_position; i++)
                        rt_kprintf("\b");
                }
                else
                {
                    rt_kprintf("\b \b");
                    shell->line[shell->line_position] = 0;
                }

                continue;
            }

            /* handle end of line, break */
            if (ch == '\r' || ch == '\n')
            {
                #ifdef FINSH_USING_HISTORY
                shell_push_history(shell);
                #endif

                #ifdef FINSH_USING_MSH
                if (msh_is_used() == RT_TRUE)
                {
                    rt_kprintf("\n");
                    msh_exec(shell->line, shell->line_position);
                }
                else
                #endif
                {
                #ifndef FINSH_USING_MSH_ONLY                
                    /* add ';' and run the command line */
                    shell->line[shell->line_position] = ';';

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

                rt_kprintf(FINSH_PROMPT);
                memset(shell->line, 0, sizeof(shell->line));
                shell->line_curpos = 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 */
            if (shell->line_curpos < shell->line_position)
            {
                int i;

                rt_memmove(&shell->line[shell->line_curpos + 1],
                           &shell->line[shell->line_curpos],
                           shell->line_position - shell->line_curpos);
                shell->line[shell->line_curpos] = ch;
                if (shell->echo_mode)
                    rt_kprintf("%s", &shell->line[shell->line_curpos]);

                /* move the cursor to new position */
                for (i = shell->line_curpos; i < shell->line_position; i++)
                    rt_kprintf("\b");
            }
            else
            {
                shell->line[shell->line_position] = ch;
                rt_kprintf("%c", ch);
            }

            ch = 0;
            shell->line_position ++;
            shell->line_curpos++;
        } /* 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
 */
int 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);
    #ifndef FINSH_USING_MSH_ONLY
    finsh_system_var_init(&VSymTab$$Base, &VSymTab$$Limit);
    #endif
#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__) || defined(__TI_COMPILER_VERSION__)
    /* GNU GCC Compiler and TI CCS */
    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));
    if (shell == RT_NULL)
    {
        rt_kprintf("no memory for shell\n");
        return -1;
    }
#else
    shell = &_shell;
#endif

    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);
    return 0;
}
INIT_COMPONENT_EXPORT(finsh_system_init);