/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2020-2021 Damien P. George
 *
 * 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 "py/runtime.h"
#include "py/mphal.h"
#include "shared/runtime/pyexec.h"
#include "extmod/machine_i2c.h"
#include "extmod/machine_mem.h"
#include "extmod/machine_pulse.h"
#include "extmod/machine_pwm.h"
#include "extmod/machine_signal.h"
#include "extmod/machine_spi.h"

#include "modmachine.h"
#include "uart.h"
#include "hardware/clocks.h"
#include "hardware/watchdog.h"
#include "pico/bootrom.h"
#include "pico/stdlib.h"
#include "pico/unique_id.h"

#define RP2_RESET_PWRON (1)
#define RP2_RESET_WDT (3)

STATIC mp_obj_t machine_unique_id(void) {
    pico_unique_board_id_t id;
    pico_get_unique_board_id(&id);
    return mp_obj_new_bytes(id.id, sizeof(id.id));
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);

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

STATIC mp_obj_t machine_reset(void) {
    watchdog_reboot(0, SRAM_END, 0);
    for (;;) {
        __wfi();
    }
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_obj, machine_reset);

STATIC mp_obj_t machine_reset_cause(void) {
    int reset_cause;
    if (watchdog_caused_reboot()) {
        reset_cause = RP2_RESET_WDT;
    } else {
        reset_cause = RP2_RESET_PWRON;
    }
    return MP_OBJ_NEW_SMALL_INT(reset_cause);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_cause_obj, machine_reset_cause);

STATIC mp_obj_t machine_bootloader(void) {
    reset_usb_boot(0, 0);
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_bootloader_obj, machine_bootloader);

STATIC mp_obj_t machine_freq(size_t n_args, const mp_obj_t *args) {
    if (n_args == 0) {
        return MP_OBJ_NEW_SMALL_INT(clock_get_hz(clk_sys));
    } else {
        mp_int_t freq = mp_obj_get_int(args[0]);
        if (!set_sys_clock_khz(freq / 1000, false)) {
            mp_raise_ValueError(MP_ERROR_TEXT("cannot change frequency"));
        }
        #if MICROPY_HW_ENABLE_UART_REPL
        setup_default_uart();
        mp_uart_init();
        #endif
        return mp_const_none;
    }
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj, 0, 1, machine_freq);

STATIC mp_obj_t machine_idle(void) {
    best_effort_wfe_or_timeout(make_timeout_time_ms(1));
    return mp_const_none;
}
STATIC 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) {
        for (;;) {
            MICROPY_EVENT_POLL_HOOK
        }
    } else {
        mp_hal_delay_ms(mp_obj_get_int(args[0]));
    }
    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) {
    machine_lightsleep(n_args, args);
    return machine_reset();
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_deepsleep_obj, 0, 1, machine_deepsleep);

STATIC mp_obj_t machine_disable_irq(void) {
    uint32_t state = MICROPY_BEGIN_ATOMIC_SECTION();
    return mp_obj_new_int(state);
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_disable_irq_obj, machine_disable_irq);

STATIC mp_obj_t machine_enable_irq(mp_obj_t state_in) {
    uint32_t state = mp_obj_get_int(state_in);
    MICROPY_END_ATOMIC_SECTION(state);
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(machine_enable_irq_obj, machine_enable_irq);

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_unique_id),           MP_ROM_PTR(&machine_unique_id_obj) },
    { MP_ROM_QSTR(MP_QSTR_soft_reset),          MP_ROM_PTR(&machine_soft_reset_obj) },
    { MP_ROM_QSTR(MP_QSTR_reset),               MP_ROM_PTR(&machine_reset_obj) },
    { MP_ROM_QSTR(MP_QSTR_reset_cause),         MP_ROM_PTR(&machine_reset_cause_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_lightsleep),          MP_ROM_PTR(&machine_lightsleep_obj) },
    { MP_ROM_QSTR(MP_QSTR_deepsleep),           MP_ROM_PTR(&machine_deepsleep_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_time_pulse_us),       MP_ROM_PTR(&machine_time_pulse_us_obj) },

    { 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_ADC),                 MP_ROM_PTR(&machine_adc_type) },
    { MP_ROM_QSTR(MP_QSTR_I2C),                 MP_ROM_PTR(&machine_hw_i2c_type) },
    { MP_ROM_QSTR(MP_QSTR_SoftI2C),             MP_ROM_PTR(&mp_machine_soft_i2c_type) },
    { MP_ROM_QSTR(MP_QSTR_Pin),                 MP_ROM_PTR(&machine_pin_type) },
    { MP_ROM_QSTR(MP_QSTR_PWM),                 MP_ROM_PTR(&machine_pwm_type) },
    { MP_ROM_QSTR(MP_QSTR_RTC),                 MP_ROM_PTR(&machine_rtc_type) },
    { MP_ROM_QSTR(MP_QSTR_Signal),              MP_ROM_PTR(&machine_signal_type) },
    { MP_ROM_QSTR(MP_QSTR_SPI),                 MP_ROM_PTR(&machine_spi_type) },
    { MP_ROM_QSTR(MP_QSTR_SoftSPI),             MP_ROM_PTR(&mp_machine_soft_spi_type) },
    { MP_ROM_QSTR(MP_QSTR_Timer),               MP_ROM_PTR(&machine_timer_type) },
    { MP_ROM_QSTR(MP_QSTR_UART),                MP_ROM_PTR(&machine_uart_type) },
    { MP_ROM_QSTR(MP_QSTR_WDT),                 MP_ROM_PTR(&machine_wdt_type) },

    { MP_ROM_QSTR(MP_QSTR_PWRON_RESET),         MP_ROM_INT(RP2_RESET_PWRON) },
    { MP_ROM_QSTR(MP_QSTR_WDT_RESET),           MP_ROM_INT(RP2_RESET_WDT) },
};
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,
};