/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2015 Damien P. George
 * Copyright (c) 2021,2022 Renesas Electronics Corporation
 *
 * 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 <stdio.h>
#include <string.h>

#include "modmachine.h"
#include "py/gc.h"
#include "py/runtime.h"
#include "py/objstr.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#include "extmod/machine_mem.h"
#include "extmod/machine_signal.h"
#include "extmod/machine_pulse.h"
#include "extmod/machine_i2c.h"
#include "extmod/machine_spi.h"
#include "shared/runtime/pyexec.h"
#include "lib/oofatfs/ff.h"
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "drivers/dht/dht.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"

#if MICROPY_PY_MACHINE

#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)

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();
    }

    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 machine_unique_id(void) {
    uint8_t id[16];
    get_unique_id((uint8_t *)&id);
    return mp_obj_new_bytes(id, 16);
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);

// Resets the pyboard in a manner similar to pushing the external RESET button.
STATIC mp_obj_t machine_reset(void) {
    powerctrl_mcu_reset();
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_obj, machine_reset);

STATIC mp_obj_t machine_soft_reset(void) {
    pyexec_system_exit = PYEXEC_FORCED_EXIT;
    mp_raise_type(&mp_type_SystemExit);
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_soft_reset_obj, machine_soft_reset);

// Activate the bootloader without BOOT* pins.
NORETURN mp_obj_t 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) {
        ;
    }
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_bootloader_obj, 0, 1, machine_bootloader);

// get or set the MCU frequencies
STATIC mp_obj_t machine_freq(size_t n_args, const mp_obj_t *args) {
    if (n_args == 0) {
        // get
        return mp_obj_new_int(SystemCoreClock);
    } else {
        // set
        mp_raise_NotImplementedError(MP_ERROR_TEXT("machine.freq set not supported yet"));
        return mp_const_none;
    }
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj, 0, 4, machine_freq);

// idle()
// This executies a wfi machine instruction which reduces power consumption
// of the MCU until an interrupt occurs, at which point execution continues.
STATIC mp_obj_t machine_idle(void) {
    __WFI();
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);

STATIC mp_obj_t 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();
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_lightsleep_obj, 0, 1, machine_lightsleep);

STATIC mp_obj_t 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();
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_deepsleep_obj, 0, 1, machine_deepsleep);

STATIC mp_obj_t machine_reset_cause(void) {
    return MP_OBJ_NEW_SMALL_INT(reset_cause);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_cause_obj, machine_reset_cause);

STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
    { MP_ROM_QSTR(MP_QSTR___name__),            MP_ROM_QSTR(MP_QSTR_umachine) },
    { MP_ROM_QSTR(MP_QSTR_info),                MP_ROM_PTR(&machine_info_obj) },
    { MP_ROM_QSTR(MP_QSTR_unique_id),           MP_ROM_PTR(&machine_unique_id_obj) },
    { MP_ROM_QSTR(MP_QSTR_reset),               MP_ROM_PTR(&machine_reset_obj) },
    { MP_ROM_QSTR(MP_QSTR_soft_reset),          MP_ROM_PTR(&machine_soft_reset_obj) },
    { MP_ROM_QSTR(MP_QSTR_bootloader),          MP_ROM_PTR(&machine_bootloader_obj) },
    { MP_ROM_QSTR(MP_QSTR_freq),                MP_ROM_PTR(&machine_freq_obj) },
    { MP_ROM_QSTR(MP_QSTR_idle),                MP_ROM_PTR(&machine_idle_obj) },
    { MP_ROM_QSTR(MP_QSTR_sleep),               MP_ROM_PTR(&machine_lightsleep_obj) },
    { MP_ROM_QSTR(MP_QSTR_lightsleep),          MP_ROM_PTR(&machine_lightsleep_obj) },
    { MP_ROM_QSTR(MP_QSTR_deepsleep),           MP_ROM_PTR(&machine_deepsleep_obj) },
    { MP_ROM_QSTR(MP_QSTR_reset_cause),         MP_ROM_PTR(&machine_reset_cause_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) },

    #if MICROPY_PY_MACHINE_PULSE
    { MP_ROM_QSTR(MP_QSTR_time_pulse_us),       MP_ROM_PTR(&machine_time_pulse_us_obj) },
    #endif

    { MP_ROM_QSTR(MP_QSTR_mem8),                MP_ROM_PTR(&machine_mem8_obj) },
    { MP_ROM_QSTR(MP_QSTR_mem16),               MP_ROM_PTR(&machine_mem16_obj) },
    { MP_ROM_QSTR(MP_QSTR_mem32),               MP_ROM_PTR(&machine_mem32_obj) },

    { MP_ROM_QSTR(MP_QSTR_Pin),                 MP_ROM_PTR(&machine_pin_type) },
    { MP_ROM_QSTR(MP_QSTR_Signal),              MP_ROM_PTR(&machine_signal_type) },

    { MP_ROM_QSTR(MP_QSTR_RTC),                 MP_ROM_PTR(&machine_rtc_type) },
    { MP_ROM_QSTR(MP_QSTR_ADC),                 MP_ROM_PTR(&machine_adc_type) },
    #if MICROPY_PY_MACHINE_I2C
    #if MICROPY_HW_ENABLE_HW_I2C
    { MP_ROM_QSTR(MP_QSTR_I2C),                 MP_ROM_PTR(&machine_i2c_type) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_SoftI2C),             MP_ROM_PTR(&mp_machine_soft_i2c_type) },
    #endif
    #if MICROPY_PY_MACHINE_SPI
    { MP_ROM_QSTR(MP_QSTR_SPI),                 MP_ROM_PTR(&machine_hard_spi_type) },
    { MP_ROM_QSTR(MP_QSTR_SoftSPI),             MP_ROM_PTR(&mp_machine_soft_spi_type) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_UART),                MP_ROM_PTR(&machine_uart_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) },

    { MP_ROM_QSTR(MP_QSTR_dht_readinto),        MP_ROM_PTR(&dht_readinto_obj) },
};

STATIC MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);

const mp_obj_module_t mp_module_machine = {
    .base = { &mp_type_module },
    .globals = (mp_obj_dict_t *)&machine_module_globals,
};

MP_REGISTER_MODULE(MP_QSTR_umachine, mp_module_machine);

#endif // MICROPY_PY_MACHINE
