/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 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 <stdio.h>
#include <string.h>

#include "py/smallint.h"
#include "py/runtime.h"

#include "ion/timing.h"

void delay_ms(mp_uint_t delay) {
    uint32_t start = millis();
    while (millis() - start < delay && !micropython_port_should_interrupt()) {
    }
}

void delay_us(mp_uint_t delay) {
    uint32_t start = micros();
    while (micros() - start < delay && !micropython_port_should_interrupt()) {
    }
}

STATIC mp_obj_t time_sleep(mp_obj_t seconds_o) {
    #if MICROPY_PY_BUILTINS_FLOAT
    delay_ms((mp_uint_t)(1000 * mp_obj_get_float(seconds_o)));
    #else
    delay_ms(1000 * mp_obj_get_int(seconds_o));
    #endif
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_utime_sleep_obj, time_sleep);

STATIC mp_obj_t time_sleep_ms(mp_obj_t arg) {
    mp_int_t ms = mp_obj_get_int(arg);
    if (ms > 0) {
        delay_ms(ms);
    }
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_utime_sleep_ms_obj, time_sleep_ms);

STATIC mp_obj_t time_sleep_us(mp_obj_t arg) {
    mp_int_t us = mp_obj_get_int(arg);
    if (us > 0) {
        delay_us(us);
    }
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_utime_sleep_us_obj, time_sleep_us);

STATIC mp_obj_t time_ticks_ms(void) {
    return MP_OBJ_NEW_SMALL_INT(millis() & (MICROPY_PY_UTIME_TICKS_PERIOD - 1));
}
MP_DEFINE_CONST_FUN_OBJ_0(mp_utime_ticks_ms_obj, time_ticks_ms);

STATIC mp_obj_t time_ticks_us(void) {
    return MP_OBJ_NEW_SMALL_INT(micros() & (MICROPY_PY_UTIME_TICKS_PERIOD - 1));
}
MP_DEFINE_CONST_FUN_OBJ_0(mp_utime_ticks_us_obj, time_ticks_us);

STATIC mp_obj_t time_ticks_diff(mp_obj_t end_in, mp_obj_t start_in) {
    // we assume that the arguments come from ticks_xx so are small ints
    mp_uint_t start = MP_OBJ_SMALL_INT_VALUE(start_in);
    mp_uint_t end = MP_OBJ_SMALL_INT_VALUE(end_in);
    // Optimized formula avoiding if conditions. We adjust difference "forward",
    // wrap it around and adjust back.
    mp_int_t diff = ((end - start + MICROPY_PY_UTIME_TICKS_PERIOD / 2) & (MICROPY_PY_UTIME_TICKS_PERIOD - 1))
                   - MICROPY_PY_UTIME_TICKS_PERIOD / 2;
    return MP_OBJ_NEW_SMALL_INT(diff);
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_utime_ticks_diff_obj, time_ticks_diff);

STATIC mp_obj_t time_ticks_add(mp_obj_t ticks_in, mp_obj_t delta_in) {
    // we assume that first argument come from ticks_xx so is small int
    mp_uint_t ticks = MP_OBJ_SMALL_INT_VALUE(ticks_in);
    mp_uint_t delta = mp_obj_get_int(delta_in);
    return MP_OBJ_NEW_SMALL_INT((ticks + delta) & (MICROPY_PY_UTIME_TICKS_PERIOD - 1));
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_utime_ticks_add_obj, time_ticks_add);

STATIC const mp_rom_map_elem_t time_module_globals_table[] = {
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_time) },

    { MP_ROM_QSTR(MP_QSTR_sleep), MP_ROM_PTR(&mp_utime_sleep_obj) },
    { MP_ROM_QSTR(MP_QSTR_sleep_ms), MP_ROM_PTR(&mp_utime_sleep_ms_obj) },
    { MP_ROM_QSTR(MP_QSTR_sleep_us), MP_ROM_PTR(&mp_utime_sleep_us_obj) },
    { MP_ROM_QSTR(MP_QSTR_ticks_ms), MP_ROM_PTR(&mp_utime_ticks_ms_obj) },
    { MP_ROM_QSTR(MP_QSTR_ticks_us), MP_ROM_PTR(&mp_utime_ticks_us_obj) },
    { MP_ROM_QSTR(MP_QSTR_ticks_add), MP_ROM_PTR(&mp_utime_ticks_add_obj) },
    { MP_ROM_QSTR(MP_QSTR_ticks_diff), MP_ROM_PTR(&mp_utime_ticks_diff_obj) },
};

STATIC MP_DEFINE_CONST_DICT(time_module_globals, time_module_globals_table);

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