/*
*   This file is part of Luma3DS
*   Copyright (C) 2016 Aurora Wright, TuxSH
*
*   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 3 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, see <http://www.gnu.org/licenses/>.
*
*   Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified
*   reasonable legal notices or author attributions in that material or in the Appropriate Legal
*   Notices displayed by works containing it.
*/

#include "fs.h"
#include "memory.h"
#include "strings.h"
#include "fatfs/ff.h"

static FATFS fs;

bool mountSd(void)
{
    return f_mount(&fs, "0:", 1) == FR_OK;
}

bool mountCtrNand(void)
{
    return f_mount(&fs, "1:", 1) == FR_OK;
}

u32 fileRead(void *dest, const char *path, u32 maxSize)
{
    FIL file;
    u32 ret = 0;

    if(f_open(&file, path, FA_READ) == FR_OK)
    {
        u32 size = f_size(&file);
        if(!(maxSize > 0 && size > maxSize))
            f_read(&file, dest, size, (unsigned int *)ret);
        f_close(&file);
    }

    return ret;
}

bool fileWrite(const void *buffer, const char *path, u32 size)
{
    FIL file;

    FRESULT result = f_open(&file, path, FA_WRITE | FA_OPEN_ALWAYS);

    if(result == FR_OK)
    {
        unsigned int written;
        f_write(&file, buffer, size, &written);
        f_truncate(&file);
        f_close(&file);

        return true;
    }

    if(result == FR_NO_PATH)
    {
        for(u32 i = 1; path[i] != 0; i++)
           if(path[i] == '/')
           {
                char folder[i + 1];
                memcpy(folder, path, i);
                folder[i] = 0;
                f_mkdir(folder);
           }

        return fileWrite(buffer, path, size);
    }

    return false;
}

u32 firmRead(void *dest)
{
    const char *firmFolders[] = { "00000002", "20000002" };
    char path[48] = "1:/title/00040138/";
    concatenateStrings(path, firmFolders[isN3DS ? 1 : 0]);
    concatenateStrings(path, "/content");

    DIR dir;
    FILINFO info;

    f_opendir(&dir, path);

    u32 firmVersion = 0xFFFFFFFF,
        ret = 0;

    //Parse the target directory
    while(f_readdir(&dir, &info) == FR_OK && info.fname[0] != 0)
    {
        //Not a cxi
        if(info.fname[9] != 'a') continue;

        //Multiple cxis were found
        if(firmVersion != 0xFFFFFFFF) ret = 1;

        //Convert the .app name to an integer
        u32 tempVersion = 0;
        for(char *tmp = info.altname; *tmp != '.'; tmp++)
        {
            tempVersion <<= 4;
            tempVersion += *tmp > '9' ? *tmp - 'A' + 10 : *tmp - '0';
        }

        //FIRM is equal or newer than 11.0
        if(tempVersion >= (isN3DS ? 0x21 : 0x52)) ret = 2;

        //Found an older cxi
        if(tempVersion < firmVersion) firmVersion = tempVersion;
    }

    f_closedir(&dir);

    if(!ret)
    {
        //Complete the string with the .app name
        concatenateStrings(path, "/00000000.app");

        //Convert back the .app name from integer to array
        hexItoa(firmVersion, &path[35], 8);

        fileRead(dest, path, 0);
    }

    return ret;
}