/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2023 Damien P. George
 * Copyright (c) 2021,2022 Renesas Electronics Corporation
 * Copyright (c) 2023 Vekatech Ltd.
 *
 * 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.
 */

// This file is never compiled standalone, it's included directly from
// extmod/modmachine.c via MICROPY_PY_MACHINE_INCLUDEFILE.

#include "modmachine.h"
#include "py/gc.h"
#include "py/objstr.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#include "lib/oofatfs/ff.h"
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "gccollect.h"
#include "irq.h"
#include "powerctrl.h"
#include "boardctrl.h"
#include "pybthread.h"
#include "storage.h"
#include "pin.h"
#include "timer.h"
#include "rtc.h"
#include "spi.h"
#include "uart.h"

#define PYB_RESET_SOFT      (0)
#define PYB_RESET_POWER_ON  (1)
#define PYB_RESET_HARD      (2)
#define PYB_RESET_WDT       (3)
#define PYB_RESET_DEEPSLEEP (4)

#define MICROPY_PY_MACHINE_EXTRA_GLOBALS \
    { MP_ROM_QSTR(MP_QSTR_info),                MP_ROM_PTR(&machine_info_obj) }, \
    { MP_ROM_QSTR(MP_QSTR_sleep),               MP_ROM_PTR(&machine_lightsleep_obj) }, \
    { MP_ROM_QSTR(MP_QSTR_disable_irq),         MP_ROM_PTR(&machine_disable_irq_obj) }, \
    { MP_ROM_QSTR(MP_QSTR_enable_irq),          MP_ROM_PTR(&machine_enable_irq_obj) }, \
    \
    { MP_ROM_QSTR(MP_QSTR_Pin),                 MP_ROM_PTR(&machine_pin_type) }, \
    \
    { MP_ROM_QSTR(MP_QSTR_RTC),                 MP_ROM_PTR(&machine_rtc_type) }, \
    { MP_ROM_QSTR(MP_QSTR_Timer),               MP_ROM_PTR(&machine_timer_type) }, \
    \
    { MP_ROM_QSTR(MP_QSTR_PWRON_RESET),         MP_ROM_INT(PYB_RESET_POWER_ON) }, \
    { MP_ROM_QSTR(MP_QSTR_HARD_RESET),          MP_ROM_INT(PYB_RESET_HARD) }, \
    { MP_ROM_QSTR(MP_QSTR_WDT_RESET),           MP_ROM_INT(PYB_RESET_WDT) }, \
    { MP_ROM_QSTR(MP_QSTR_DEEPSLEEP_RESET),     MP_ROM_INT(PYB_RESET_DEEPSLEEP) }, \
    { MP_ROM_QSTR(MP_QSTR_SOFT_RESET),          MP_ROM_INT(PYB_RESET_SOFT) }, \

static uint32_t reset_cause;

void get_unique_id(uint8_t *id) {
    uint32_t *p = (uint32_t *)id;
    uint32_t *uniqueid = (uint32_t *)R_BSP_UniqueIdGet();
    p[0] = uniqueid[0];
    p[1] = uniqueid[1];
    p[2] = uniqueid[2];
    p[3] = uniqueid[3];
}

void machine_init(void) {
}

void machine_deinit(void) {
    // we are doing a soft-reset so change the reset_cause
    reset_cause = PYB_RESET_SOFT;
}

// machine.info([dump_alloc_table])
// Print out lots of information about the board.
static mp_obj_t machine_info(size_t n_args, const mp_obj_t *args) {
    // get and print unique id; 128 bits
    {
        uint8_t id[16];
        get_unique_id((uint8_t *)&id);
        printf("ID=%02x%02x%02x%02x:%02x%02x%02x%02x:%02x%02x%02x%02x:%02x%02x%02x%02x\n",
            id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7],
            id[8], id[9], id[10], id[11], id[12], id[13], id[14], id[15]);
    }
    // get and print clock speeds
    // SystemCoreClock is an external variable in FSP
    printf("S=%u\nP=%u\n",
        (unsigned int)SystemCoreClock,
        (unsigned int)MICROPY_HW_MCU_PCLK);
    // to print info about memory
    {
        printf("_etext=%p\n", &_etext);
        printf("_sidata=%p\n", &_sidata);
        printf("_sdata=%p\n", &_sdata);
        printf("_edata=%p\n", &_edata);
        printf("_sbss=%p\n", &_sbss);
        printf("_ebss=%p\n", &_ebss);
        printf("_sstack=%p\n", &_sstack);
        printf("_estack=%p\n", &_estack);
        printf("_ram_start=%p\n", &_ram_start);
        printf("_heap_start=%p\n", &_heap_start);
        printf("_heap_end=%p\n", &_heap_end);
        printf("_ram_end=%p\n", &_ram_end);
    }

    // qstr info
    {
        size_t n_pool, n_qstr, n_str_data_bytes, n_total_bytes;
        qstr_pool_info(&n_pool, &n_qstr, &n_str_data_bytes, &n_total_bytes);
        printf("qstr:\n  n_pool=%u\n  n_qstr=%u\n  n_str_data_bytes=%u\n  n_total_bytes=%u\n", n_pool, n_qstr, n_str_data_bytes, n_total_bytes);
    }

    // GC info
    {
        gc_info_t info;
        gc_info(&info);
        printf("GC:\n");
        printf("  %u total\n", info.total);
        printf("  %u : %u\n", info.used, info.free);
        printf("  1=%u 2=%u m=%u\n", info.num_1block, info.num_2block, info.max_block);
    }

    // free space on flash
    {
        #if MICROPY_VFS_FAT
        for (mp_vfs_mount_t *vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
            if (strncmp("/flash", vfs->str, vfs->len) == 0) {
                // assumes that it's a FatFs filesystem
                fs_user_mount_t *vfs_fat = MP_OBJ_TO_PTR(vfs->obj);
                DWORD nclst;
                f_getfree(&vfs_fat->fatfs, &nclst);
                printf("LFS free: %u bytes\n", (uint)(nclst * vfs_fat->fatfs.csize * 512));
                break;
            }
        }
        #endif
    }

    #if MICROPY_PY_THREAD
    pyb_thread_dump();
    #endif

    if (n_args == 1) {
        // arg given means dump gc allocation table
        gc_dump_alloc_table(&mp_plat_print);
    }

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_info_obj, 0, 1, machine_info);

// Returns a string of 16 bytes (128 bits), which is the unique ID for the MCU.
static mp_obj_t mp_machine_unique_id(void) {
    uint8_t id[16];
    get_unique_id((uint8_t *)&id);
    return mp_obj_new_bytes(id, 16);
}

// Resets the pyboard in a manner similar to pushing the external RESET button.
MP_NORETURN static void mp_machine_reset(void) {
    powerctrl_mcu_reset();
}

// Activate the bootloader without BOOT* pins.
MP_NORETURN void mp_machine_bootloader(size_t n_args, const mp_obj_t *args) {
    #if MICROPY_HW_ENABLE_STORAGE
    storage_flush();
    #endif

    __disable_irq();

    MICROPY_BOARD_ENTER_BOOTLOADER(n_args, args);

    #if MICROPY_HW_USES_BOOTLOADER
    // ToDo: need to review how to implement

    #endif

    while (1) {
        ;
    }
}

// get or set the MCU frequencies
static mp_obj_t mp_machine_get_freq(void) {
    return mp_obj_new_int(SystemCoreClock);
}

static void mp_machine_set_freq(size_t n_args, const mp_obj_t *args) {
    mp_raise_NotImplementedError(MP_ERROR_TEXT("machine.freq set not supported yet"));
}

// idle()
// This executies a wfi machine instruction which reduces power consumption
// of the MCU until an interrupt occurs, at which point execution continues.
static void mp_machine_idle(void) {
    __WFI();
}

static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {
    if (n_args != 0) {
        mp_obj_t args2[2] = {MP_OBJ_NULL, args[0]};
        machine_rtc_wakeup(2, args2);
    }
    powerctrl_enter_stop_mode();
}

MP_NORETURN static void mp_machine_deepsleep(size_t n_args, const mp_obj_t *args) {
    if (n_args != 0) {
        mp_obj_t args2[2] = {MP_OBJ_NULL, args[0]};
        machine_rtc_wakeup(2, args2);
    }
    powerctrl_enter_standby_mode();
}

static mp_int_t mp_machine_reset_cause(void) {
    return reset_cause;
}
