/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Scott Shawcroft
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "supervisor/flash.h"

#include "extmod/vfs_fat.h"
#include "py/runtime.h"
#include "lib/oofatfs/ff.h"

#define VFS_INDEX 0

void supervisor_flash_set_usb_writable(bool usb_writable) {
    mp_vfs_mount_t* current_mount = MP_STATE_VM(vfs_mount_table);
    for (uint8_t i = 0; current_mount != NULL; i++) {
        if (i == VFS_INDEX) {
            break;
        }
        current_mount = current_mount->next;
    }
    if (current_mount == NULL) {
        return;
    }
    fs_user_mount_t *vfs = (fs_user_mount_t *) current_mount->obj;

    if (usb_writable) {
        vfs->flags |= FSUSER_USB_WRITABLE;
    } else {
        vfs->flags &= ~FSUSER_USB_WRITABLE;
    }
}

// there is a singleton Flash object
const mp_obj_type_t supervisor_flash_type;
STATIC const mp_obj_base_t supervisor_flash_obj = {&supervisor_flash_type};

STATIC mp_obj_t supervisor_flash_obj_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
    // check arguments
    mp_arg_check_num(n_args, n_kw, 0, 0, false);

    // return singleton object
    return (mp_obj_t)&supervisor_flash_obj;
}

STATIC mp_obj_t supervisor_flash_obj_readblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_WRITE);
    mp_uint_t ret = supervisor_flash_read_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FILESYSTEM_BLOCK_SIZE);
    return MP_OBJ_NEW_SMALL_INT(ret);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_readblocks_obj, supervisor_flash_obj_readblocks);

STATIC mp_obj_t supervisor_flash_obj_writeblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
    mp_uint_t ret = supervisor_flash_write_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FILESYSTEM_BLOCK_SIZE);
    return MP_OBJ_NEW_SMALL_INT(ret);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_writeblocks_obj, supervisor_flash_obj_writeblocks);

STATIC mp_obj_t supervisor_flash_obj_ioctl(mp_obj_t self, mp_obj_t cmd_in, mp_obj_t arg_in) {
    mp_int_t cmd = mp_obj_get_int(cmd_in);
    switch (cmd) {
        case BP_IOCTL_INIT: supervisor_flash_init(); return MP_OBJ_NEW_SMALL_INT(0);
        case BP_IOCTL_DEINIT: supervisor_flash_flush(); return MP_OBJ_NEW_SMALL_INT(0); // TODO properly
        case BP_IOCTL_SYNC: supervisor_flash_flush(); return MP_OBJ_NEW_SMALL_INT(0);
        case BP_IOCTL_SEC_COUNT: return MP_OBJ_NEW_SMALL_INT(supervisor_flash_get_block_count());
        case BP_IOCTL_SEC_SIZE: return MP_OBJ_NEW_SMALL_INT(supervisor_flash_get_block_size());
        default: return mp_const_none;
    }
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_ioctl_obj, supervisor_flash_obj_ioctl);

STATIC const mp_rom_map_elem_t supervisor_flash_obj_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_readblocks), MP_ROM_PTR(&supervisor_flash_obj_readblocks_obj) },
    { MP_ROM_QSTR(MP_QSTR_writeblocks), MP_ROM_PTR(&supervisor_flash_obj_writeblocks_obj) },
    { MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&supervisor_flash_obj_ioctl_obj) },
};

STATIC MP_DEFINE_CONST_DICT(supervisor_flash_obj_locals_dict, supervisor_flash_obj_locals_dict_table);

const mp_obj_type_t supervisor_flash_type = {
    { &mp_type_type },
    .name = MP_QSTR_Flash,
    .make_new = supervisor_flash_obj_make_new,
    .locals_dict = (mp_obj_t)&supervisor_flash_obj_locals_dict,
};

void supervisor_flash_init_vfs(fs_user_mount_t *vfs) {
    vfs->base.type = &mp_fat_vfs_type;
    vfs->flags |= FSUSER_NATIVE | FSUSER_HAVE_IOCTL;
    vfs->fatfs.drv = vfs;
    vfs->fatfs.part = 1; // flash filesystem lives on first partition
    vfs->readblocks[0] = (mp_obj_t)&supervisor_flash_obj_readblocks_obj;
    vfs->readblocks[1] = (mp_obj_t)&supervisor_flash_obj;
    vfs->readblocks[2] = (mp_obj_t)supervisor_flash_read_blocks; // native version
    vfs->writeblocks[0] = (mp_obj_t)&supervisor_flash_obj_writeblocks_obj;
    vfs->writeblocks[1] = (mp_obj_t)&supervisor_flash_obj;
    vfs->writeblocks[2] = (mp_obj_t)supervisor_flash_write_blocks; // native version
    vfs->u.ioctl[0] = (mp_obj_t)&supervisor_flash_obj_ioctl_obj;
    vfs->u.ioctl[1] = (mp_obj_t)&supervisor_flash_obj;
}