/*
 Esp.cpp - ESP8266-specific APIs
 Copyright (c) 2015 Ivan Grokhotkov. All rights reserved.
 This file is part of the esp8266 core for Arduino environment.

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "Arduino.h"
#include "flash_utils.h"
#include "eboot_command.h"
#include <memory>
#include "interrupts.h"
#include "MD5Builder.h"
#include "umm_malloc/umm_malloc.h"
#include "cont.h"

extern "C" {
#include "user_interface.h"

extern struct rst_info resetInfo;
}


//#define DEBUG_SERIAL Serial


/**
 * User-defined Literals
 *  usage:
 *
 *   uint32_t = test = 10_MHz; // --> 10000000
 */

unsigned long long operator"" _kHz(unsigned long long x) {
    return x * 1000;
}

unsigned long long operator"" _MHz(unsigned long long x) {
    return x * 1000 * 1000;
}

unsigned long long operator"" _GHz(unsigned long long x) {
    return x * 1000 * 1000 * 1000;
}

unsigned long long operator"" _kBit(unsigned long long x) {
    return x * 1024;
}

unsigned long long operator"" _MBit(unsigned long long x) {
    return x * 1024 * 1024;
}

unsigned long long operator"" _GBit(unsigned long long x) {
    return x * 1024 * 1024 * 1024;
}

unsigned long long operator"" _kB(unsigned long long x) {
    return x * 1024;
}

unsigned long long operator"" _MB(unsigned long long x) {
    return x * 1024 * 1024;
}

unsigned long long operator"" _GB(unsigned long long x) {
    return x * 1024 * 1024 * 1024;
}


EspClass ESP;

void EspClass::wdtEnable(uint32_t timeout_ms)
{
    (void) timeout_ms;
    /// This API can only be called if software watchdog is stopped
    system_soft_wdt_restart();
}

void EspClass::wdtEnable(WDTO_t timeout_ms)
{
    wdtEnable((uint32_t) timeout_ms);
}

void EspClass::wdtDisable(void)
{
    /// Please don't stop software watchdog too long (less than 6 seconds),
    /// otherwise it will trigger hardware watchdog reset.
    system_soft_wdt_stop();
}

void EspClass::wdtFeed(void)
{
    system_soft_wdt_feed();
}

extern "C" void esp_yield();

void EspClass::deepSleep(uint64_t time_us, WakeMode mode)
{
    system_deep_sleep_set_option(static_cast<int>(mode));
    system_deep_sleep(time_us);
    esp_yield();
}

void EspClass::deepSleepInstant(uint64_t time_us, WakeMode mode)
{
    system_deep_sleep_set_option(static_cast<int>(mode));
    system_deep_sleep_instant(time_us);
    esp_yield();
}

//this calculation was taken verbatim from the SDK api reference for SDK 2.1.0.
//Note: system_rtc_clock_cali_proc() returns a uint32_t, even though system_deep_sleep() takes a uint64_t.
uint64_t EspClass::deepSleepMax()
{
  //cali*(2^31-1)/(2^12)
  return (uint64_t)system_rtc_clock_cali_proc()*(0x80000000-1)/(0x1000);

}

/* 
Layout of RTC Memory is as follows:
Ref: Espressif doc 2C-ESP8266_Non_OS_SDK_API_Reference, section 3.3.23 (system_rtc_mem_write)

|<------system data (256 bytes)------->|<-----------------user data (512 bytes)--------------->|

SDK function signature:   
bool	system_rtc_mem_read	(
				uint32	des_addr,	
				void	*	src_addr,	
				uint32	save_size
)   

The system data section can't be used by the user, so:
des_addr must be >=64 (i.e.: 256/4) and <192 (i.e.: 768/4)
src_addr is a pointer to data
save_size is the number of bytes to write

For the method interface:
offset is the user block number (block size is 4 bytes) must be >= 0 and <128
data is a pointer to data, 4-byte aligned
size is number of bytes in the block pointed to by data

Same for write

Note: If the Updater class is in play, e.g.: the application uses OTA, the eboot
command will be stored into the first 128 bytes of user data, then it will be
retrieved by eboot on boot. That means that user data present there will be lost.
Ref: 
- discussion in PR #5330.
- https://github.com/esp8266/esp8266-wiki/wiki/Memory-Map#memmory-mapped-io-registers
- Arduino/bootloaders/eboot/eboot_command.h RTC_MEM definition
*/

bool EspClass::rtcUserMemoryRead(uint32_t offset, uint32_t *data, size_t size)
{
    if (offset * 4 + size > 512 || size == 0) {
        return false;
    } else {
        return system_rtc_mem_read(64 + offset, data, size);
    }
}

bool EspClass::rtcUserMemoryWrite(uint32_t offset, uint32_t *data, size_t size)
{
    if (offset * 4 + size > 512 || size == 0) {
        return false;
    } else {
        return system_rtc_mem_write(64 + offset, data, size);
    }
}



extern "C" void __real_system_restart_local();
void EspClass::reset(void)
{
    __real_system_restart_local();
}

void EspClass::restart(void)
{
    system_restart();
    esp_yield();
}

uint16_t EspClass::getVcc(void)
{
    InterruptLock lock;
    (void)lock;
    return system_get_vdd33();
}

uint32_t EspClass::getFreeHeap(void)
{
    return system_get_free_heap_size();
}

uint16_t EspClass::getMaxFreeBlockSize(void)
{
    return umm_max_block_size();
}

uint32_t EspClass::getFreeContStack()
{
    return cont_get_free_stack(g_pcont);
}

void EspClass::resetFreeContStack()
{
    cont_repaint_stack(g_pcont);
}

uint32_t EspClass::getChipId(void)
{
    return system_get_chip_id();
}

extern "C" uint32_t core_version;
extern "C" const char* core_release;

String EspClass::getCoreVersion()
{
    if (core_release != NULL) {
        return String(core_release);
    }
    char buf[12];
    snprintf(buf, sizeof(buf), "%08x", core_version);
    return String(buf);
}

const char * EspClass::getSdkVersion(void)
{
    return system_get_sdk_version();
}

uint8_t EspClass::getBootVersion(void)
{
    return system_get_boot_version();
}

uint8_t EspClass::getBootMode(void)
{
    return system_get_boot_mode();
}

uint8_t EspClass::getCpuFreqMHz(void)
{
    return system_get_cpu_freq();
}


uint32_t EspClass::getFlashChipId(void)
{
    return spi_flash_get_id();
}

uint32_t EspClass::getFlashChipRealSize(void)
{
    return (1 << ((spi_flash_get_id() >> 16) & 0xFF));
}

uint32_t EspClass::getFlashChipSize(void)
{
    uint32_t data;
    uint8_t * bytes = (uint8_t *) &data;
    // read first 4 byte (magic byte + flash config)
    if(spi_flash_read(0x0000, &data, 4) == SPI_FLASH_RESULT_OK) {
        return magicFlashChipSize((bytes[3] & 0xf0) >> 4);
    }
    return 0;
}

uint32_t EspClass::getFlashChipSpeed(void)
{
    uint32_t data;
    uint8_t * bytes = (uint8_t *) &data;
    // read first 4 byte (magic byte + flash config)
    if(spi_flash_read(0x0000, &data, 4) == SPI_FLASH_RESULT_OK) {
        return magicFlashChipSpeed(bytes[3] & 0x0F);
    }
    return 0;
}

FlashMode_t EspClass::getFlashChipMode(void)
{
    FlashMode_t mode = FM_UNKNOWN;
    uint32_t data;
    uint8_t * bytes = (uint8_t *) &data;
    // read first 4 byte (magic byte + flash config)
    if(spi_flash_read(0x0000, &data, 4) == SPI_FLASH_RESULT_OK) {
        mode = magicFlashChipMode(bytes[2]);
    }
    return mode;
}

uint32_t EspClass::magicFlashChipSize(uint8_t byte) {
    switch(byte & 0x0F) {
        case 0x0: // 4 Mbit (512KB)
            return (512_kB);
        case 0x1: // 2 MBit (256KB)
            return (256_kB);
        case 0x2: // 8 MBit (1MB)
            return (1_MB);
        case 0x3: // 16 MBit (2MB)
            return (2_MB);
        case 0x4: // 32 MBit (4MB)
            return (4_MB);
        case 0x8: // 64 MBit (8MB)
            return (8_MB);
        case 0x9: // 128 MBit (16MB)
            return (16_MB);
        default: // fail?
            return 0;
    }
}

uint32_t EspClass::magicFlashChipSpeed(uint8_t byte) {
    switch(byte & 0x0F) {
        case 0x0: // 40 MHz
            return (40_MHz);
        case 0x1: // 26 MHz
            return (26_MHz);
        case 0x2: // 20 MHz
            return (20_MHz);
        case 0xf: // 80 MHz
            return (80_MHz);
        default: // fail?
            return 0;
    }
}

FlashMode_t EspClass::magicFlashChipMode(uint8_t byte) {
    FlashMode_t mode = (FlashMode_t) byte;
    if(mode > FM_DOUT) {
        mode = FM_UNKNOWN;
    }
    return mode;
}

/**
 * Infos from
 *  http://www.wlxmall.com/images/stock_item/att/A1010004.pdf
 *  http://www.gigadevice.com/product-series/5.html?locale=en_US
 *  http://www.elinux.org/images/f/f5/Winbond-w25q32.pdf
 */
uint32_t EspClass::getFlashChipSizeByChipId(void) {
    uint32_t chipId = getFlashChipId();
    /**
     * Chip ID
     * 00 - always 00 (Chip ID use only 3 byte)
     * 17 - ? looks like 2^xx is size in Byte ?     //todo: find docu to this
     * 40 - ? may be Speed ?                        //todo: find docu to this
     * C8 - manufacturer ID
     */
    switch(chipId) {

        // GigaDevice
        case 0x1740C8: // GD25Q64B
            return (8_MB);
        case 0x1640C8: // GD25Q32B
            return (4_MB);
        case 0x1540C8: // GD25Q16B
            return (2_MB);
        case 0x1440C8: // GD25Q80
            return (1_MB);
        case 0x1340C8: // GD25Q40
            return (512_kB);
        case 0x1240C8: // GD25Q20
            return (256_kB);
        case 0x1140C8: // GD25Q10
            return (128_kB);
        case 0x1040C8: // GD25Q12
            return (64_kB);

        // Winbond
        case 0x1640EF: // W25Q32
            return (4_MB);
        case 0x1540EF: // W25Q16
            return (2_MB);
        case 0x1440EF: // W25Q80
            return (1_MB);
        case 0x1340EF: // W25Q40
            return (512_kB);

        // BergMicro
        case 0x1640E0: // BG25Q32
            return (4_MB);
        case 0x1540E0: // BG25Q16
            return (2_MB);
        case 0x1440E0: // BG25Q80
            return (1_MB);
        case 0x1340E0: // BG25Q40
            return (512_kB);

        default:
            return 0;
    }
}

/**
 * check the Flash settings from IDE against the Real flash size
 * @param needsEquals (return only true it equals)
 * @return ok or not
 */
bool EspClass::checkFlashConfig(bool needsEquals) {
    if(needsEquals) {
        if(getFlashChipRealSize() == getFlashChipSize()) {
            return true;
        }
    } else {
        if(getFlashChipRealSize() >= getFlashChipSize()) {
            return true;
        }
    }
    return false;
}

String EspClass::getResetReason(void) {
    char buff[32];
    if (resetInfo.reason == REASON_DEFAULT_RST) { // normal startup by power on
      strcpy_P(buff, PSTR("Power on"));
    } else if (resetInfo.reason == REASON_WDT_RST) { // hardware watch dog reset
      strcpy_P(buff, PSTR("Hardware Watchdog"));
    } else if (resetInfo.reason == REASON_EXCEPTION_RST) { // exception reset, GPIO status won’t change
      strcpy_P(buff, PSTR("Exception"));
    } else if (resetInfo.reason == REASON_SOFT_WDT_RST) { // software watch dog reset, GPIO status won’t change
      strcpy_P(buff, PSTR("Software Watchdog"));
    } else if (resetInfo.reason == REASON_SOFT_RESTART) { // software restart ,system_restart , GPIO status won’t change
      strcpy_P(buff, PSTR("Software/System restart"));
    } else if (resetInfo.reason == REASON_DEEP_SLEEP_AWAKE) { // wake up from deep-sleep
      strcpy_P(buff, PSTR("Deep-Sleep Wake"));
    } else if (resetInfo.reason == REASON_EXT_SYS_RST) { // external system reset
      strcpy_P(buff, PSTR("External System"));
    } else {
      strcpy_P(buff, PSTR("Unknown"));
    }
    return String(buff);
}

String EspClass::getResetInfo(void) {
    if(resetInfo.reason != 0) {
        char buff[200];
        sprintf(&buff[0], "Fatal exception:%d flag:%d (%s) epc1:0x%08x epc2:0x%08x epc3:0x%08x excvaddr:0x%08x depc:0x%08x", resetInfo.exccause, resetInfo.reason, (resetInfo.reason == 0 ? "DEFAULT" : resetInfo.reason == 1 ? "WDT" : resetInfo.reason == 2 ? "EXCEPTION" : resetInfo.reason == 3 ? "SOFT_WDT" : resetInfo.reason == 4 ? "SOFT_RESTART" : resetInfo.reason == 5 ? "DEEP_SLEEP_AWAKE" : resetInfo.reason == 6 ? "EXT_SYS_RST" : "???"), resetInfo.epc1, resetInfo.epc2, resetInfo.epc3, resetInfo.excvaddr, resetInfo.depc);
        return String(buff);
    }
    return String("flag: 0");
}

struct rst_info * EspClass::getResetInfoPtr(void) {
    return &resetInfo;
}

bool EspClass::eraseConfig(void) {
    const size_t cfgSize = 0x4000;
    size_t cfgAddr = ESP.getFlashChipSize() - cfgSize;

    for (size_t offset = 0; offset < cfgSize; offset += SPI_FLASH_SEC_SIZE) {
        if (!flashEraseSector((cfgAddr + offset) / SPI_FLASH_SEC_SIZE)) {
            return false;
        }
    }

    return true;
}

uint32_t EspClass::getSketchSize() {
    static uint32_t result = 0;
    if (result)
        return result;

    image_header_t image_header;
    uint32_t pos = APP_START_OFFSET;
    if (spi_flash_read(pos, (uint32_t*) &image_header, sizeof(image_header))) {
        return 0;
    }
    pos += sizeof(image_header);
#ifdef DEBUG_SERIAL
    DEBUG_SERIAL.printf("num_segments=%u\r\n", image_header.num_segments);
#endif
    for (uint32_t section_index = 0;
        section_index < image_header.num_segments;
        ++section_index)
    {
        section_header_t section_header = {0, 0};
        if (spi_flash_read(pos, (uint32_t*) &section_header, sizeof(section_header))) {
            return 0;
        }
        pos += sizeof(section_header);
        pos += section_header.size;
#ifdef DEBUG_SERIAL
        DEBUG_SERIAL.printf("section=%u size=%u pos=%u\r\n", section_index, section_header.size, pos);
#endif
    }
    result = (pos + 16) & ~15;
    return result;
}

extern "C" uint32_t _SPIFFS_start;

uint32_t EspClass::getFreeSketchSpace() {

    uint32_t usedSize = getSketchSize();
    // round one sector up
    uint32_t freeSpaceStart = (usedSize + FLASH_SECTOR_SIZE - 1) & (~(FLASH_SECTOR_SIZE - 1));
    uint32_t freeSpaceEnd = (uint32_t)&_SPIFFS_start - 0x40200000;

#ifdef DEBUG_SERIAL
    DEBUG_SERIAL.printf("usedSize=%u freeSpaceStart=%u freeSpaceEnd=%u\r\n", usedSize, freeSpaceStart, freeSpaceEnd);
#endif
    return freeSpaceEnd - freeSpaceStart;
}

bool EspClass::updateSketch(Stream& in, uint32_t size, bool restartOnFail, bool restartOnSuccess) {
  if(!Update.begin(size)){
#ifdef DEBUG_SERIAL
    DEBUG_SERIAL.print("Update ");
    Update.printError(DEBUG_SERIAL);
#endif
    if(restartOnFail) ESP.restart();
    return false;
  }

  if(Update.writeStream(in) != size){
#ifdef DEBUG_SERIAL
    DEBUG_SERIAL.print("Update ");
    Update.printError(DEBUG_SERIAL);
#endif
    if(restartOnFail) ESP.restart();
    return false;
  }

  if(!Update.end()){
#ifdef DEBUG_SERIAL
    DEBUG_SERIAL.print("Update ");
    Update.printError(DEBUG_SERIAL);
#endif
    if(restartOnFail) ESP.restart();
    return false;
  }

#ifdef DEBUG_SERIAL
    DEBUG_SERIAL.println("Update SUCCESS");
#endif
    if(restartOnSuccess) ESP.restart();
    return true;
}

static const int FLASH_INT_MASK = ((B10 << 8) | B00111010);

bool EspClass::flashEraseSector(uint32_t sector) {
    ets_isr_mask(FLASH_INT_MASK);
    int rc = spi_flash_erase_sector(sector);
    ets_isr_unmask(FLASH_INT_MASK);
    return rc == 0;
}

bool EspClass::flashWrite(uint32_t offset, uint32_t *data, size_t size) {
    ets_isr_mask(FLASH_INT_MASK);
    int rc = spi_flash_write(offset, (uint32_t*) data, size);
    ets_isr_unmask(FLASH_INT_MASK);
    return rc == 0;
}

bool EspClass::flashRead(uint32_t offset, uint32_t *data, size_t size) {
    ets_isr_mask(FLASH_INT_MASK);
    int rc = spi_flash_read(offset, (uint32_t*) data, size);
    ets_isr_unmask(FLASH_INT_MASK);
    return rc == 0;
}

String EspClass::getSketchMD5()
{
    static String result;
    if (result.length()) {
        return result;
    }
    uint32_t lengthLeft = getSketchSize();
    const size_t bufSize = 512;
    std::unique_ptr<uint8_t[]> buf(new uint8_t[bufSize]);
    uint32_t offset = 0;
    if(!buf.get()) {
        return String();
    }
    MD5Builder md5;
    md5.begin();
    while( lengthLeft > 0) {
        size_t readBytes = (lengthLeft < bufSize) ? lengthLeft : bufSize;
        if (!flashRead(offset, reinterpret_cast<uint32_t*>(buf.get()), (readBytes + 3) & ~3)) {
            return String();
        }
        md5.add(buf.get(), readBytes);
        lengthLeft -= readBytes;
        offset += readBytes;
    }
    md5.calculate();
    result = md5.toString();
    return result;
}
