#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <ogcsys.h>

#include "nand.h"
static u32 inbuf[8] ATTRIBUTE_ALIGN(32);
/* Constants */
#define BASE_PATH "/tmp"

s32 Nand_Init(void) {
    return ISFS_Initialize();
}

s32 Nand_CreateDir(u64 tid) {
    char dirpath[ISFS_MAXPATH];
    
    /* Generate dirpath */
    sprintf(dirpath, BASE_PATH "/%08x", (u32)(tid & 0xFFFFFFFF));
    
    /* Create directory */
    return ISFS_CreateDir(dirpath, 0, ISFS_OPEN_RW, ISFS_OPEN_RW, ISFS_OPEN_RW);
}

s32 Nand_CreateFile(u64 tid, const char *filename) {
    char filepath[ISFS_MAXPATH];
    
    /* Generate filepath */
    sprintf(filepath, BASE_PATH "/%08x/%s", (u32)(tid & 0xFFFFFFFF), filename);
    
    /* Create file */
    return ISFS_CreateFile(filepath, 0, ISFS_OPEN_RW, ISFS_OPEN_RW,
        ISFS_OPEN_RW);
}

s32 Nand_OpenFile(u64 tid, const char *filename, u8 mode) {
    char filepath[ISFS_MAXPATH];
    
    /* Generate filepath */
    sprintf(filepath, BASE_PATH "/%08x/%s", (u32)(tid & 0xFFFFFFFF), filename);
    
    /* Open file */
    return IOS_Open(filepath, mode);
}

s32 Nand_CloseFile(s32 fd) {
    /* Close file */
    return IOS_Close(fd);
}

s32 Nand_ReadFile(s32 fd, void *buf, u32 len) {
    /* Read file */
    return IOS_Read(fd, buf, len);
}

s32 Nand_WriteFile(s32 fd, void *buf, u32 len) {
    /* Write file */
    return IOS_Write(fd, buf, len);
}

s32 Nand_RemoveDir(u64 tid) {
    char *dirlist = NULL;
    
    char dirpath[ISFS_MAXPATH], filepath[ISFS_MAXPATH];
    u32 cnt, idx, nb_files;
    s32 ret;
    char *ptr;
    
    /* Generate dirpath */
    sprintf(dirpath, BASE_PATH "/%08x", (u32)(tid & 0xFFFFFFFF));
    
    /* Retrieve number of files */
    ret = ISFS_ReadDir(dirpath, dirlist, &nb_files);
    if (ret < 0) {
        return ret;
    }

    /* There are files inside the directory */
    if (nb_files) {
        /* Allocate memory */
        dirlist = (char *) memalign(32, ISFS_MAXPATH * nb_files);
        if (!dirlist) {
            return -1;
        }

        /* Retrieve filelist */
        ret = ISFS_ReadDir(dirpath, dirlist, &nb_files);
        for (cnt = idx = 0; ret >= 0 && cnt < nb_files; cnt++) {
            ptr = dirlist + idx;
            
            /* Generate filepath */
            sprintf(filepath, "%s/%s", dirpath, ptr);
            
            /* Delete file */
            ret = ISFS_Delete(filepath);
            if (ret < 0) {
                continue;
            }
            /* Move to next entry */
            idx += strlen(ptr) + 1;
        }
    }
    if (ret >= 0) {
        /* Delete directory */
        ret = ISFS_Delete(dirpath);
    }
    /* Free memory */
    if (dirlist) free(dirlist);
    return ret;
}

s32 Nand_Mount(nandDevice *dev) {
    s32 fd, ret;
    
    /* Open FAT module */
    fd = IOS_Open("fat", 0);
    if (fd < 0) {
        return fd;
    }

    /* Mount device */
    ret = IOS_Ioctlv(fd, dev->mountCmd, 0, 0, NULL);
    
    /* Close FAT module */
    IOS_Close(fd);
    
    return ret;
}

s32 Nand_Unmount(nandDevice *dev) {
    s32 fd, ret;
    
    /* Open FAT module */
    fd = IOS_Open("fat", 0);
    if (fd < 0) {
        return fd;
    }

    /* Unmount device */
    ret = IOS_Ioctlv(fd, dev->umountCmd, 0, 0, NULL);
    /* Close FAT module */
    IOS_Close(fd);
    
    return ret;
}

s32 Nand_Enable(nandDevice *dev) {
    s32 fd, ret;
    
    /* Open /dev/fs */
    fd = IOS_Open("/dev/fs", 0);
    if (fd < 0) {
        return fd;
    }

    /* Set input buffer */
    inbuf[0] = dev->mode;
    /* Enable NAND emulator */
    ret = IOS_Ioctl(fd, 100, inbuf, sizeof(inbuf), NULL, 0);
    /* Close /dev/fs */
    IOS_Close(fd);
    
    return ret;
}

s32 Nand_Disable(void) {
    s32 fd, ret;
    
    /* Open /dev/fs */
    fd = IOS_Open("/dev/fs", 0);
    if (fd < 0) {
        return fd;
    }

    /* Set input buffer */
    inbuf[0] = 0;
    /* Disable NAND emulator */
    ret = IOS_Ioctl(fd, 100, inbuf, sizeof(inbuf), NULL, 0);
    /* Close /dev/fs */
    IOS_Close(fd);
    
    return ret;
}