//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:       Kernel shell                                                  //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2019 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K 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 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K 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 OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#include "shell.h"

error_t CmdBeep(int argc, char **argv, char *cmdline)
{
    IoDoBeep();
    return EOK;
}

error_t CmdStarWars(int argc, char **argv, char *cmdline)
{
    IoDoStarWars();

    return EOK;
}

error_t CmdQuit(int argc, char **argv, char *cmdline)
{
    PoShutdown();
    return EOK;
}

error_t CmdHelp(int argc, char **argv, char *cmdline)
{
    uint i, count = 0;
    Command_t *cmd;

    if (argc == 1) {
        KernLog("List of all shell built-ins:\n");
        for (cmd = cmdtable; cmd->name != NULL; cmd++, count++) {
            KernLog("\t%s", cmd->name);
            for (i = strlen(cmd->name)/4; i<3; i++) {
                KernLog("\t");
            }
            KernLog("%s\n", cmd->help);
        }
        KernLog("End of list; %u commands total\n", count);
    }
    
    return EOK;
}

error_t CmdClear(int argc, char **argv, char *cmdline)
{
    BLockBuf(BStdOut);
    
    BStdOut->wp = BStdOut->rp = BStdOut->buf;
    BStdOut->lastLF = 0;
    
    BUnlockBuf(BStdOut);
        
    return EOK;
}

error_t CmdDate(int argc, char **argv, char *cmdline)
{
    KernLog("%.10s\n", KeFormatCurTime());
    return EOK;
}

error_t CmdTime(int argc, char **argv, char *cmdline)
{
    KernLog("%s\n", &KeFormatCurTime()[13]);
    return EOK;
}

error_t CmdMemMap(int argc, char **argv, char *cmdline)
{
    MmPrintMemoryMap();
    return EOK;
}

extern void pstest(void);

error_t CmdPsTest(int argc, char **argv, char *cmdline)
{
   // pstest();
    return EOK;
}

error_t CmdDie(int argc, char **argv, char *cmdline)
{
    *(char *)NULL += 1;
    return EOK;
}

error_t CmdPF(int argc, char **argv, char *cmdline)
{
    /* if (argc != 2) */
    /*     return EINVAL; */

    /* ulong address = atoul(argv[1]); */
    /* KernLog("print: %s, %d\n", argv[1], address); */

    /* *((char*)address) += 1; */

    for (int i = 0; i < 32; i++) {
        KernLog("%dGB ", i);
        *((char*)(i*GB)) = 1;
    }

    return EOK;
}

error_t CmdArgs(int argc, char **argv, char *cmdline)
{
    int i;

    KernLog("cmdline: '%s'\nargc: %d\n", cmdline, argc);

    for (i = 0; i < argc; i++) {
        KernLog("argv[%d]: '%s'\n", i, argv[i]);
    }
    
    return EOK;
}

error_t CmdColor(int argc, char **argv, char *cmdline)
{
    int col = 0;
    char *p;
    
    if (argc > 2) {
        KernLog("Usage: 'color [#|list]'\n");
        return EINVAL;
    }
    
    if (argc == 1) {
        KernLog("Current color: %s (%d)\n", RtlColorNames[shcol], shcol);
    }

    else if (!strcmp(argv[1], "list")) {
        KernLog("Available colors:\n");
        for (col = 0; col <= VGA_COLOR_WHITE; col++) {
            KernLog("%d - %s\n", col, RtlColorNames[col]);
        }
    }
    
    else {
        p = argv[1];

        while (isdigit(*p) && col < VGA_COLOR_WHITE) {
            col = 10 * col + *p++ - '0';
        }

        if (*p || col < VGA_COLOR_BLACK || col > VGA_COLOR_WHITE) {
            KernLog("Invalid color: %d\n", col);
            KernLog("Usage: 'color [#|list]'\n");
            return EINVAL;
        }

        else {
            shcol = col;
        }
        
    }
    return EOK;
}

void MmInitPaging(void);
void MmReloadPaging(void);

error_t CmdReloadPage(int argc, char **argv, char *cmdline)
{
    MmReloadPaging();
    return EOK;
}

extern void KeStartShell(void);

error_t CmdShell(int argc, char **argv, char *cmdline)
{
    KeStartShell();
    return EOK;
}

error_t CmdStackOverflow(int argc, char **argv, char *cmdline)
{    
    CmdStackOverflow(0, 0, 0);
    return EOK;
}

error_t CmdStackUnderflow(int argc, char **argv, char *cmdline)
{
    for (int i = 0 ;; i++) {
        asm volatile ("pop %rax\n");
    }

    return EOK;
}

error_t CmdMemUsage(int argc, char **argv, char *cmdline);

error_t CmdVersion(int argc, char **argv, char *cmdline)
{
    KernLog("OS/K version %s (x86-64)\n", _KALEID_VERSION);
    KernLog("Copyright (C) 2018-2019 The OS/K Team\n");
    KernLog("License GNU GPL version 3 "
            "or later, see <http://gnu.org/licenses/gpl.html>\n");
    KernLog("This is free software; you are "
            "free to change and redistribute it.\n");
    KernLog("There is NO WARRANTY, to the extent permitted by law.\n\n");
    return EOK;
}

//----------------------------------------------------------------------------//

Command_t cmdtable[] =
{
    { "args",       CmdArgs,            "Print command line" },
    { "beep",       CmdBeep,            "Make a beep" },
    { "cls",        CmdClear,           "Clears standard output" },
    { "color",      CmdColor,           "Change shell text color" },
    { "date",       CmdDate,            "Print date" },
    { "die",        CmdDie,             "Die painfully" },
    { "exit",       CmdQuit,            "Initiate shutdown" },
    { "help",       CmdHelp,            "Show this message" },
    { "rpag",       CmdReloadPage,      "Reload the pages directory" },
    { "march",      CmdStarWars,        "Play the Imperial March"},
    { "mmap",       CmdMemMap,          "Show memory map" },
    { "musage",     CmdMemUsage,        "Show memory statistics" },
    { "pfault",     CmdPF,              "Provoke a PF. Usage : pfault <address>" },
    { "pstest",     CmdPsTest,          "Scheduler test routine" },
    { "quit",       CmdQuit,            "Alias for 'exit'" },
    { "shell",      CmdShell,           "Start a new shell (nested)", },
    { "stkov",      CmdStackOverflow,   "Provoke a stack overflow" },
    { "stkun",      CmdStackUnderflow,   "Provoke a stack underflow" },
    { "time",       CmdTime,            "Print time" },
    { "ver",        CmdVersion,         "Version and legal infos" },
    { NULL, NULL, NULL }
};