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#include <Arduino.h>
#include <WiFi.h>

#include "ConfigStore.h"
#include "DataAggregator.h"
#include "module/NetworkUploader.h"
#include "sensor/AudioSampler.h"
#include "sensor/I2cSensorManager.h"
#include "sensor/Types.h"

namespace {
QueueHandle_t sensorQueue;
QueueHandle_t uploadQueue;
SemaphoreHandle_t dataMutex;
SemaphoreHandle_t configMutex;

LatestData latestData;
ConfigStore configStore;
I2cSensorManager i2cSensors;
AudioSampler audioSampler;
DataAggregator dataAggregator;
NetworkUploader networkUploader;

String wifiHostname;

String normalizedHostnameFromDeviceId(const char *deviceId) {
  String hostname = "fenghou-";
  hostname += deviceId;
  hostname.toLowerCase();

  for (size_t i = 0; i < hostname.length(); i++) {
    char c = hostname.charAt(i);
    bool allowed = (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '-';
    if (!allowed) {
      hostname.setCharAt(i, '-');
    }
  }

  return hostname;
}

void onWiFiEvent(WiFiEvent_t event, WiFiEventInfo_t info) {
  switch (event) {
  case ARDUINO_EVENT_WIFI_STA_START:
    Serial.println("[wifi-event] STA start");
    break;
  case ARDUINO_EVENT_WIFI_STA_CONNECTED:
    Serial.println("[wifi-event] STA connected to AP");
    break;
  case ARDUINO_EVENT_WIFI_STA_GOT_IP:
    Serial.print("[wifi-event] got IP: ");
    Serial.println(WiFi.localIP());
    break;
  case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
    Serial.print("[wifi-event] STA disconnected, reason=");
    Serial.println(info.wifi_sta_disconnected.reason);
    break;
  default:
    break;
  }
}

void taskI2CSensors(void *) {
  i2cSensors.run();
}

void taskAudio(void *) {
  audioSampler.run();
}

void taskDataProcess(void *) {
  dataAggregator.run();
}

void taskNetworkUpload(void *) {
  networkUploader.run();
}
} // namespace

void setup() {
  Serial.begin(115200);
  unsigned long serialWaitStart = millis();
  while (!Serial && millis() - serialWaitStart < 3000) {
    delay(10);
  }
  delay(2000);

  sensorQueue = xQueueCreate(12, sizeof(SensorSample));
  uploadQueue = xQueueCreate(3, sizeof(LatestData));
  dataMutex = xSemaphoreCreateMutex();
  configMutex = xSemaphoreCreateMutex();
  if (!sensorQueue || !uploadQueue || !dataMutex || !configMutex) {
    Serial.println("FreeRTOS allocation failed.");
    while (true) {
      delay(1000);
    }
  }

  if (!configStore.begin(configMutex)) {
    Serial.println("Preferences init failed.");
  }
  configStore.load();

  DeviceConfig cfg;
  configStore.getCopy(&cfg);
  wifiHostname = normalizedHostnameFromDeviceId(cfg.deviceId);
  WiFi.onEvent(onWiFiEvent);
  WiFi.mode(WIFI_STA);
  WiFi.setSleep(false);
  WiFi.setHostname(wifiHostname.c_str());
  WiFi.persistent(false);

  Serial.println("Fenghou on-device monitor booting");
  Serial.printf("Config: valid=%d ssid=%s server=%s device=%s\n",
                cfg.valid,
                cfg.ssid,
                cfg.server,
                cfg.deviceId);
  Serial.print("WiFi hostname: ");
  Serial.println(wifiHostname);

  i2cSensors.begin(sensorQueue, &configStore, dataMutex, &latestData);
  audioSampler.begin(sensorQueue);
  dataAggregator.begin(sensorQueue, uploadQueue, dataMutex, &latestData, &configStore);
  networkUploader.begin(uploadQueue, &configStore);

  xTaskCreate(taskI2CSensors, "i2c", 6144, nullptr, 2, nullptr);
  xTaskCreate(taskAudio, "audio", 4096, nullptr, 3, nullptr);
  xTaskCreate(taskDataProcess, "data", 4096, nullptr, 1, nullptr);
  xTaskCreate(taskNetworkUpload, "upload", 6144, nullptr, 2, nullptr);
}

void loop() {
  vTaskDelay(pdMS_TO_TICKS(1000));
}

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#include "I2cSensorManager.h"

#include <Wire.h>
#include <math.h>

#include "../DebugLog.h"

void I2cSensorManager::begin(QueueHandle_t sampleQueue,
                             ConfigStore *configStore,
                             SemaphoreHandle_t dataMutex,
                             LatestData *latestData) {
  sampleQueue_ = sampleQueue;
  configStore_ = configStore;
  dataMutex_ = dataMutex;
  latestData_ = latestData;
}

void I2cSensorManager::run() {
  Wire.begin(PIN_I2C_SDA, PIN_I2C_SCL);
  Wire.setClock(I2C_CLOCK_HZ);
  Wire.setTimeOut(50);
  vTaskDelay(pdMS_TO_TICKS(100));

  scanI2cBus();

  aht20Present_ = i2cDevicePresent(AHT20_ADDR);
  bmp280Present_ = bmp280Begin();
  sgp30Present_ = i2cDevicePresent(SGP30_ADDR) && sgp30Begin();
  as7341Present_ = as7341Setup();
  st25Present_ = i2cDevicePresent(ST25_USER_ADDR);
  DEBUG_LOG("[sensor:init] sda=%d scl=%d aht20=%d bmp280=%d sgp30=%d as7341=%d st25=%d\n",
            PIN_I2C_SDA,
            PIN_I2C_SCL,
            aht20Present_ ? 1 : 0,
            bmp280Present_ ? 1 : 0,
            sgp30Present_ ? 1 : 0,
            as7341Present_ ? 1 : 0,
            st25Present_ ? 1 : 0);

  uint32_t lastAht = 0;
  uint32_t lastBmp = 0;
  uint32_t lastSgp = 0;
  uint32_t lastAs = 0;
  uint32_t lastNfc = 0;

  for (;;) {
    uint32_t now = millis();

    if (now - lastNfc >= 5000) {
      lastNfc = now;
      pollNfc(now);
    }
    if (now - lastAht >= 2000) {
      lastAht = now;
      pollAht(now);
    }
    if (now - lastBmp >= 5000) {
      lastBmp = now;
      pollBmp(now);
    }
    if (now - lastSgp >= 1000) {
      lastSgp = now;
      pollSgp(now);
    }
    if (now - lastAs >= 5000) {
      lastAs = now;
      pollAs7341(now);
    }

    vTaskDelay(pdMS_TO_TICKS(50));
  }
}

void I2cSensorManager::sendSample(const SensorSample &sample) {
  xQueueSend(sampleQueue_, &sample, QUEUE_WAIT);
}

void I2cSensorManager::pollNfc(uint32_t now) {
  if (!st25Present_) {
    return;
  }
  char raw[256];
  if (!st25ReadUserMemory(raw, sizeof(raw))) {
    return;
  }
  DEBUG_LOG("[sensor:nfc] raw=%s\n", raw);
  if (!configStore_ || !configStore_->applyPayload(raw)) {
    return;
  }

  SensorSample sample = {};
  sample.kind = KIND_CONFIG;
  sample.ms = now;
  sample.ok = true;
  sendSample(sample);
  Serial.println("NFC config updated.");
}

void I2cSensorManager::pollAht(uint32_t now) {
  SensorSample sample = {};
  sample.kind = KIND_AHT;
  sample.ms = now;
  sample.ok = aht20Present_ && aht20Read(&sample.temperatureC, &sample.humidityRh);
  DEBUG_LOG("[sensor:aht20] ok=%d temperature_c=%.2f humidity_rh=%.2f\n",
            sample.ok ? 1 : 0,
            sample.temperatureC,
            sample.humidityRh);
  sendSample(sample);
}

void I2cSensorManager::pollBmp(uint32_t now) {
  SensorSample sample = {};
  sample.kind = KIND_BMP;
  sample.ms = now;
  sample.ok = bmp280Read(&sample.temperatureC, &sample.pressureHpa, &sample.altitudeM);
  DEBUG_LOG("[sensor:bmp280] ok=%d temperature_c=%.2f pressure_hpa=%.2f altitude_m=%.1f\n",
            sample.ok ? 1 : 0,
            sample.temperatureC,
            sample.pressureHpa,
            sample.altitudeM);
  sendSample(sample);
}

void I2cSensorManager::pollSgp(uint32_t now) {
  SensorSample sample = {};
  sample.kind = KIND_AIR;
  sample.ms = now;
  sample.sgpWarmup = sgp30StartMs_ == 0 || now - sgp30StartMs_ < 15000;

  LatestData copy;
  xSemaphoreTake(dataMutex_, portMAX_DELAY);
  copy = *latestData_;
  xSemaphoreGive(dataMutex_);

  if (sgp30Present_) {
    uint32_t ah = absoluteHumidityMgM3(copy.temperatureC, copy.humidityRh);
    if (ah) {
      sgp30SetHumidity(ah);
    }
    sample.ok = sgp30Read(&sample.eco2Ppm, &sample.tvocPpb);
  }
  DEBUG_LOG("[sensor:sgp30] present=%d ok=%d eco2_ppm=%u tvoc_ppb=%u warmup=%d\n",
            sgp30Present_ ? 1 : 0,
            sample.ok ? 1 : 0,
            sample.eco2Ppm,
            sample.tvocPpb,
            sample.sgpWarmup ? 1 : 0);
  sendSample(sample);
}

void I2cSensorManager::pollAs7341(uint32_t now) {
  SensorSample sample = {};
  sample.kind = KIND_LIGHT;
  sample.ms = now;
  sample.ok = as7341Present_ && as7341Read(sample.f, &sample.clear, &sample.nir);
  if (!sample.ok && i2cDevicePresent(AS7341_ADDR)) {
    as7341Present_ = as7341Setup();
  }
  DEBUG_LOG("[sensor:as7341] ok=%d f=[%u,%u,%u,%u,%u,%u,%u,%u] clear=%u nir=%u\n",
            sample.ok ? 1 : 0,
            sample.f[0], sample.f[1], sample.f[2], sample.f[3],
            sample.f[4], sample.f[5], sample.f[6], sample.f[7],
            sample.clear,
            sample.nir);
  sendSample(sample);
}

void I2cSensorManager::scanI2cBus() {
  DEBUG_LOG("[i2c:scan] start sda=%d scl=%d clock=%lu\n",
            PIN_I2C_SDA,
            PIN_I2C_SCL,
            static_cast<unsigned long>(I2C_CLOCK_HZ));

  uint8_t found = 0;
  for (uint8_t addr = 1; addr < 0x7F; addr++) {
    Wire.beginTransmission(addr);
    uint8_t err = Wire.endTransmission();
    if (err == 0) {
      found++;
      DEBUG_LOG("[i2c:scan] found addr=0x%02X%s%s%s%s%s\n",
                addr,
                addr == AHT20_ADDR ? " AHT20" : "",
                addr == AS7341_ADDR ? " AS7341" : "",
                addr == SGP30_ADDR ? " SGP30" : "",
                (addr == BMP280_ADDR_PRIMARY || addr == BMP280_ADDR_SECONDARY) ? " BMP280" : "",
                addr == ST25_USER_ADDR ? " ST25" : "");
    } else if (err == 4) {
      DEBUG_LOG("[i2c:scan] unknown error addr=0x%02X err=%u\n", addr, err);
    }
    vTaskDelay(pdMS_TO_TICKS(1));
  }

  DEBUG_LOG("[i2c:scan] done found=%u\n", found);
}

bool I2cSensorManager::i2cWrite(uint8_t addr, const uint8_t *data, size_t len) {
  Wire.beginTransmission(addr);
  Wire.write(data, len);
  uint8_t err = Wire.endTransmission();
  if (err != 0) {
    DEBUG_LOG("[i2c:write-fail] addr=0x%02X len=%u err=%u\n",
              addr,
              static_cast<unsigned int>(len),
              err);
    return false;
  }
  return true;
}

bool I2cSensorManager::i2cWriteByte(uint8_t addr, uint8_t reg, uint8_t value) {
  uint8_t data[2] = {reg, value};
  return i2cWrite(addr, data, sizeof(data));
}

bool I2cSensorManager::i2cReadReg(uint8_t addr, uint8_t reg, uint8_t *buf, size_t len) {
  Wire.beginTransmission(addr);
  Wire.write(reg);
  uint8_t err = Wire.endTransmission(false);
  if (err != 0) {
    DEBUG_LOG("[i2c:read-reg-fail] phase=write-addr addr=0x%02X reg=0x%02X len=%u err=%u\n",
              addr,
              reg,
              static_cast<unsigned int>(len),
              err);
    return false;
  }
  size_t got = Wire.requestFrom(addr, static_cast<uint8_t>(len));
  if (got != len) {
    DEBUG_LOG("[i2c:read-reg-fail] phase=request addr=0x%02X reg=0x%02X len=%u got=%u\n",
              addr,
              reg,
              static_cast<unsigned int>(len),
              static_cast<unsigned int>(got));
    return false;
  }
  for (size_t i = 0; i < len; i++) {
    buf[i] = Wire.read();
  }
  return true;
}

bool I2cSensorManager::i2cDevicePresent(uint8_t addr) {
  Wire.beginTransmission(addr);
  uint8_t err = Wire.endTransmission();
  DEBUG_LOG("[i2c:probe] addr=0x%02X present=%d err=%u\n",
            addr,
            err == 0 ? 1 : 0,
            err);
  return err == 0;
}

uint16_t I2cSensorManager::le16(const uint8_t *p) {
  return static_cast<uint16_t>(p[0]) | (static_cast<uint16_t>(p[1]) << 8);
}

int16_t I2cSensorManager::sle16(const uint8_t *p) {
  return static_cast<int16_t>(le16(p));
}

uint8_t I2cSensorManager::crc8Sgp30(const uint8_t *data, uint8_t len) {
  uint8_t crc = 0xFF;
  for (uint8_t i = 0; i < len; i++) {
    crc ^= data[i];
    for (uint8_t bit = 0; bit < 8; bit++) {
      crc = (crc & 0x80) ? (crc << 1) ^ 0x31 : (crc << 1);
    }
  }
  return crc;
}

bool I2cSensorManager::sgp30Command(const uint8_t *cmd,
                                    uint8_t cmdLen,
                                    uint16_t delayMs,
                                    uint16_t *words,
                                    uint8_t wordCount) {
  if (!i2cWrite(SGP30_ADDR, cmd, cmdLen)) {
    return false;
  }
  vTaskDelay(pdMS_TO_TICKS(delayMs));
  if (wordCount == 0) {
    return true;
  }

  const uint8_t replyLen = wordCount * 3;
  uint8_t reply[18];
  if (replyLen > sizeof(reply)) {
    return false;
  }
  size_t got = Wire.requestFrom(SGP30_ADDR, replyLen);
  if (got != replyLen) {
    DEBUG_LOG("[i2c:request-fail] sensor=sgp30 addr=0x%02X len=%u got=%u\n",
              SGP30_ADDR,
              replyLen,
              static_cast<unsigned int>(got));
    return false;
  }
  for (uint8_t i = 0; i < replyLen; i++) {
    reply[i] = Wire.read();
  }
  for (uint8_t i = 0; i < wordCount; i++) {
    uint8_t *p = &reply[i * 3];
    if (crc8Sgp30(p, 2) != p[2]) {
      return false;
    }
    words[i] = (static_cast<uint16_t>(p[0]) << 8) | p[1];
  }
  return true;
}

bool I2cSensorManager::sgp30Begin() {
  uint8_t iaqInit[] = {0x20, 0x03};
  if (!sgp30Command(iaqInit, sizeof(iaqInit), 10)) {
    return false;
  }
  sgp30StartMs_ = millis();
  return true;
}

uint32_t I2cSensorManager::absoluteHumidityMgM3(float temperatureC, float humidityRh) {
  if (!isfinite(temperatureC) || !isfinite(humidityRh)) {
    return 0;
  }
  const float ah = 216.7f *
                   ((humidityRh / 100.0f) * 6.112f *
                    expf((17.62f * temperatureC) / (243.12f + temperatureC)) /
                    (273.15f + temperatureC));
  if (ah <= 0.0f) {
    return 0;
  }
  return static_cast<uint32_t>(ah * 1000.0f);
}

bool I2cSensorManager::sgp30SetHumidity(uint32_t absoluteHumidity) {
  if (absoluteHumidity > 256000) {
    return false;
  }
  uint16_t scaled = static_cast<uint16_t>(((uint64_t)absoluteHumidity * 256 * 16777) >> 24);
  uint8_t cmd[5] = {0x20, 0x61, static_cast<uint8_t>(scaled >> 8), static_cast<uint8_t>(scaled & 0xFF), 0};
  cmd[4] = crc8Sgp30(cmd + 2, 2);
  return sgp30Command(cmd, sizeof(cmd), 10);
}

bool I2cSensorManager::sgp30Read(uint16_t *eco2, uint16_t *tvoc) {
  uint8_t cmd[] = {0x20, 0x08};
  uint16_t words[2];
  if (!sgp30Command(cmd, sizeof(cmd), 12, words, 2)) {
    return false;
  }
  *eco2 = words[0];
  *tvoc = words[1];
  DEBUG_LOG("[sensor:sgp30:raw] words=%u,%u\n", words[0], words[1]);
  return true;
}

bool I2cSensorManager::aht20Read(float *temperatureC, float *humidityRh) {
  uint8_t status = 0;
  if (!i2cReadReg(AHT20_ADDR, 0x71, &status, 1)) {
    return false;
  }
  if ((status & 0x18) != 0x18) {
    uint8_t initCmd[] = {0xBE, 0x08, 0x00};
    i2cWrite(AHT20_ADDR, initCmd, sizeof(initCmd));
    vTaskDelay(pdMS_TO_TICKS(10));
  }

  uint8_t trig[] = {0xAC, 0x33, 0x00};
  if (!i2cWrite(AHT20_ADDR, trig, sizeof(trig))) {
    return false;
  }
  vTaskDelay(pdMS_TO_TICKS(80));

  uint8_t data[7];
  size_t got = Wire.requestFrom(AHT20_ADDR, static_cast<uint8_t>(7));
  if (got != 7) {
    DEBUG_LOG("[i2c:request-fail] sensor=aht20 addr=0x%02X len=7 got=%u\n",
              AHT20_ADDR,
              static_cast<unsigned int>(got));
    return false;
  }
  for (uint8_t i = 0; i < 7; i++) {
    data[i] = Wire.read();
  }
  if (data[0] & 0x80) {
    return false;
  }

  uint32_t rawHumidity = ((uint32_t)data[1] << 12) | ((uint32_t)data[2] << 4) | (data[3] >> 4);
  uint32_t rawTemperature = ((uint32_t)(data[3] & 0x0F) << 16) | ((uint32_t)data[4] << 8) | data[5];
  DEBUG_LOG("[sensor:aht20:raw] status=0x%02X bytes=%02X %02X %02X %02X %02X %02X %02X raw_h=%lu raw_t=%lu\n",
            data[0], data[0], data[1], data[2], data[3], data[4], data[5], data[6],
            static_cast<unsigned long>(rawHumidity),
            static_cast<unsigned long>(rawTemperature));
  *humidityRh = rawHumidity * 100.0f / 1048576.0f;
  *temperatureC = rawTemperature * 200.0f / 1048576.0f - 50.0f;
  return true;
}

bool I2cSensorManager::bmp280ReadCoefficients(uint8_t addr) {
  uint8_t c[24];
  if (!i2cReadReg(addr, 0x88, c, sizeof(c))) {
    return false;
  }
  bmpDigT1_ = le16(c + 0);
  bmpDigT2_ = sle16(c + 2);
  bmpDigT3_ = sle16(c + 4);
  bmpDigP1_ = le16(c + 6);
  bmpDigP2_ = sle16(c + 8);
  bmpDigP3_ = sle16(c + 10);
  bmpDigP4_ = sle16(c + 12);
  bmpDigP5_ = sle16(c + 14);
  bmpDigP6_ = sle16(c + 16);
  bmpDigP7_ = sle16(c + 18);
  bmpDigP8_ = sle16(c + 20);
  bmpDigP9_ = sle16(c + 22);
  return bmpDigP1_ != 0;
}

bool I2cSensorManager::bmp280Begin() {
  uint8_t id = 0;
  if (i2cReadReg(BMP280_ADDR_PRIMARY, 0xD0, &id, 1) && id == 0x58) {
    bmp280Addr_ = BMP280_ADDR_PRIMARY;
  } else if (i2cReadReg(BMP280_ADDR_SECONDARY, 0xD0, &id, 1) && id == 0x58) {
    bmp280Addr_ = BMP280_ADDR_SECONDARY;
  } else {
    return false;
  }
  if (!bmp280ReadCoefficients(bmp280Addr_)) {
    return false;
  }
  if (!i2cWriteByte(bmp280Addr_, 0xF4, 0x2F)) {
    return false;
  }
  return i2cWriteByte(bmp280Addr_, 0xF5, 0x90);
}

bool I2cSensorManager::bmp280Read(float *temperatureC, float *pressureHpa, float *altitudeM) {
  uint8_t d[6];
  if (!bmp280Present_ || !i2cReadReg(bmp280Addr_, 0xF7, d, sizeof(d))) {
    return false;
  }
  int32_t adcP = ((int32_t)d[0] << 12) | ((int32_t)d[1] << 4) | (d[2] >> 4);
  int32_t adcT = ((int32_t)d[3] << 12) | ((int32_t)d[4] << 4) | (d[5] >> 4);
  DEBUG_LOG("[sensor:bmp280:raw] addr=0x%02X bytes=%02X %02X %02X %02X %02X %02X adc_p=%ld adc_t=%ld\n",
            bmp280Addr_,
            d[0], d[1], d[2], d[3], d[4], d[5],
            static_cast<long>(adcP),
            static_cast<long>(adcT));

  int32_t var1 = ((((adcT >> 3) - ((int32_t)bmpDigT1_ << 1))) * ((int32_t)bmpDigT2_)) >> 11;
  int32_t var2 = (((((adcT >> 4) - ((int32_t)bmpDigT1_)) * ((adcT >> 4) - ((int32_t)bmpDigT1_))) >> 12) *
                  ((int32_t)bmpDigT3_)) >> 14;
  bmpTfine_ = var1 + var2;
  *temperatureC = ((bmpTfine_ * 5 + 128) >> 8) / 100.0f;

  int64_t pVar1 = ((int64_t)bmpTfine_) - 128000;
  int64_t pVar2 = pVar1 * pVar1 * (int64_t)bmpDigP6_;
  pVar2 = pVar2 + ((pVar1 * (int64_t)bmpDigP5_) << 17);
  pVar2 = pVar2 + (((int64_t)bmpDigP4_) << 35);
  pVar1 = ((pVar1 * pVar1 * (int64_t)bmpDigP3_) >> 8) + ((pVar1 * (int64_t)bmpDigP2_) << 12);
  pVar1 = (((((int64_t)1) << 47) + pVar1)) * ((int64_t)bmpDigP1_) >> 33;
  if (pVar1 == 0) {
    return false;
  }
  int64_t p = 1048576 - adcP;
  p = (((p << 31) - pVar2) * 3125) / pVar1;
  pVar1 = (((int64_t)bmpDigP9_) * (p >> 13) * (p >> 13)) >> 25;
  pVar2 = (((int64_t)bmpDigP8_) * p) >> 19;
  p = ((p + pVar1 + pVar2) >> 8) + (((int64_t)bmpDigP7_) << 4);
  *pressureHpa = (p / 256.0f) / 100.0f;
  *altitudeM = 44330.0f * (1.0f - powf(*pressureHpa / 1013.25f, 0.1903f));
  return true;
}

bool I2cSensorManager::as7341WaitBitClear(uint8_t reg, uint8_t bitMask, uint16_t timeoutMs) {
  uint32_t start = millis();
  uint8_t v = 0;
  do {
    if (!i2cReadReg(AS7341_ADDR, reg, &v, 1)) {
      return false;
    }
    if ((v & bitMask) == 0) {
      return true;
    }
    vTaskDelay(pdMS_TO_TICKS(2));
  } while (millis() - start < timeoutMs);
  return false;
}

bool I2cSensorManager::as7341WaitDataReady(uint16_t timeoutMs) {
  uint32_t start = millis();
  uint8_t v = 0;
  do {
    if (!i2cReadReg(AS7341_ADDR, 0xA3, &v, 1)) {
      return false;
    }
    if (v & 0x40) {
      return true;
    }
    vTaskDelay(pdMS_TO_TICKS(5));
  } while (millis() - start < timeoutMs);
  return false;
}

bool I2cSensorManager::as7341WriteSmux(const uint8_t *smux) {
  if (!i2cWriteByte(AS7341_ADDR, 0x80, 0x01)) {
    return false;
  }
  if (!i2cWriteByte(AS7341_ADDR, 0xAF, 0x10)) {
    return false;
  }
  for (uint8_t i = 0; i < 20; i++) {
    if (!i2cWriteByte(AS7341_ADDR, i, smux[i])) {
      return false;
    }
  }
  if (!i2cWriteByte(AS7341_ADDR, 0x80, 0x11)) {
    return false;
  }
  return as7341WaitBitClear(0x80, 0x10, 100);
}

bool I2cSensorManager::as7341Setup() {
  if (!i2cDevicePresent(AS7341_ADDR)) {
    return false;
  }
  return i2cWriteByte(AS7341_ADDR, 0x80, 0x01) &&
         i2cWriteByte(AS7341_ADDR, 0x81, 0x64) &&
         i2cWriteByte(AS7341_ADDR, 0xCA, 0xE7) &&
         i2cWriteByte(AS7341_ADDR, 0xCB, 0x03) &&
         i2cWriteByte(AS7341_ADDR, 0xAA, 0x09);
}

bool I2cSensorManager::as7341ReadSix(uint16_t *out) {
  if (!i2cWriteByte(AS7341_ADDR, 0x80, 0x03)) {
    return false;
  }
  if (!as7341WaitDataReady(400)) {
    i2cWriteByte(AS7341_ADDR, 0x80, 0x01);
    return false;
  }
  uint8_t d[12];
  if (!i2cReadReg(AS7341_ADDR, 0x95, d, sizeof(d))) {
    return false;
  }
  for (uint8_t i = 0; i < 6; i++) {
    out[i] = le16(d + i * 2);
  }
  i2cWriteByte(AS7341_ADDR, 0x80, 0x01);
  return true;
}

bool I2cSensorManager::as7341Read(uint16_t f[8], uint16_t *clear, uint16_t *nir) {
  static const uint8_t smuxLo[20] = {
      0x30, 0x01, 0x00, 0x00, 0x00, 0x42, 0x00, 0x00, 0x50, 0x00,
      0x00, 0x00, 0x20, 0x04, 0x00, 0x30, 0x01, 0x50, 0x00, 0x06};
  static const uint8_t smuxHi[20] = {
      0x00, 0x00, 0x00, 0x40, 0x02, 0x00, 0x10, 0x03, 0x50, 0x10,
      0x03, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x50, 0x00, 0x06};
  uint16_t lo[6];
  uint16_t hi[6];
  if (!as7341WriteSmux(smuxLo) || !as7341ReadSix(lo)) {
    return false;
  }
  if (!as7341WriteSmux(smuxHi) || !as7341ReadSix(hi)) {
    return false;
  }
  DEBUG_LOG("[sensor:as7341:raw] lo=[%u,%u,%u,%u,%u,%u] hi=[%u,%u,%u,%u,%u,%u]\n",
            lo[0], lo[1], lo[2], lo[3], lo[4], lo[5],
            hi[0], hi[1], hi[2], hi[3], hi[4], hi[5]);
  f[0] = lo[0];
  f[1] = lo[1];
  f[2] = lo[2];
  f[3] = lo[3];
  f[4] = hi[0];
  f[5] = hi[1];
  f[6] = hi[2];
  f[7] = hi[3];
  *clear = (lo[4] + hi[4]) / 2;
  *nir = (lo[5] + hi[5]) / 2;
  return true;
}

bool I2cSensorManager::st25ReadUserMemory(char *buf, size_t len) {
  if (len == 0) {
    return false;
  }
  memset(buf, 0, len);
  Wire.beginTransmission(ST25_USER_ADDR);
  Wire.write(0x00);
  Wire.write(0x00);
  if (Wire.endTransmission(false) != 0) {
    return false;
  }
  size_t toRead = min(len - 1, static_cast<size_t>(220));
  size_t got = Wire.requestFrom(ST25_USER_ADDR, static_cast<uint8_t>(toRead));
  if (got != toRead) {
    DEBUG_LOG("[i2c:request-fail] sensor=st25 addr=0x%02X len=%u got=%u\n",
              ST25_USER_ADDR,
              static_cast<unsigned int>(toRead),
              static_cast<unsigned int>(got));
  }
  for (size_t i = 0; i < got && i < len - 1; i++) {
    char c = static_cast<char>(Wire.read());
    buf[i] = isPrintable(c) ? c : ' ';
  }
  buf[min(got, len - 1)] = 0;
  return got > 0;
}

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interface Env {
  DB: D1Database;
}

type JsonObject = Record<string, unknown>;

const DEVICE_ID_MAX_LENGTH = 128;
const DEVICE_ID_PATTERN = /^[A-Za-z0-9._:-]+$/;
const SENSOR_NAME_MAX_LENGTH = 128;
const SENSOR_NAME_PATTERN = /^[A-Za-z0-9._:-]+$/;

interface DeviceUploadPayload {
  deviceId: string;
  sensorData: Array<{
    name: string;
    data: string;
  }>;
  recordedAt: string;
}

export default {
  async fetch(request: Request, env: Env): Promise<Response> {
    try {
      const url = new URL(request.url);

      if (request.method === "OPTIONS") {
        return new Response(null, { status: 204, headers: corsHeaders() });
      }

      if ((url.pathname === "/health" || url.pathname === "/api/health") && request.method === "GET") {
        return jsonResponse({ ok: true });
      }

      if (url.pathname === "/device/upload" || url.pathname === "/api/device/upload") {
        if (request.method !== "POST") {
          return jsonError("method_not_allowed", "Use POST /api/device/upload.", 405);
        }

        return handleDeviceUpload(request, env);
      }

      return jsonError("not_found", "Route not found.", 404);
    } catch (error) {
      console.error("Unhandled request error", error);
      return jsonError("internal_error", "Internal server error.", 500);
    }
  }
} satisfies ExportedHandler<Env>;

async function handleDeviceUpload(request: Request, env: Env): Promise<Response> {
  const contentType = request.headers.get("content-type") ?? "";
  if (!contentType.toLowerCase().includes("application/json")) {
    return jsonError("unsupported_media_type", "Request body must be JSON.", 415);
  }

  const payload = await parseJsonObject(request);
  if (!payload.ok) {
    return jsonError("invalid_json", payload.error, 400);
  }

  const upload = normalizeDeviceUploadPayload(payload.value);
  if (!upload.ok) {
    return jsonError(upload.code, upload.error, 400);
  }

  console.log(
    JSON.stringify({
      event: "device_upload_received",
      device_id: upload.value.deviceId,
      time: upload.value.recordedAt,
      sensor_count: upload.value.sensorData.length,
      sensor_names: upload.value.sensorData.map((sensor) => sensor.name)
    })
  );

  const receivedAt = new Date().toISOString();

  const statements = [
    env.DB.prepare(
      `INSERT INTO device (device_id, first_seen_time, last_upload_time, upload_count)
       VALUES (?1, ?2, ?2, 1)
       ON CONFLICT(device_id) DO UPDATE SET
         last_upload_time = excluded.last_upload_time,
         upload_count = device.upload_count + 1`
    ).bind(upload.value.deviceId, receivedAt),
  ];
  const dataIds: string[] = [];

  for (const sensor of upload.value.sensorData) {
    const dataId = crypto.randomUUID();
    dataIds.push(dataId);

    statements.push(
      env.DB.prepare(
        `INSERT INTO sensor_data
           (data_id, device_id, sensor_name, data, time, upload_time)
         VALUES (?1, ?2, ?3, ?4, ?5, ?6)`
      ).bind(
        dataId,
        upload.value.deviceId,
        sensor.name,
        sensor.data,
        upload.value.recordedAt,
        receivedAt
      )
    );
  }

  await env.DB.batch(statements);

  console.log(
    JSON.stringify({
      event: "device_upload_stored",
      device_id: upload.value.deviceId,
      time: upload.value.recordedAt,
      upload_time: receivedAt,
      sensor_count: upload.value.sensorData.length,
      data_ids: dataIds
    })
  );

  return jsonResponse(
    {
      ok: true,
      device_id: upload.value.deviceId,
      time: upload.value.recordedAt,
      upload_time: receivedAt,
      sensor_count: upload.value.sensorData.length,
      data_ids: dataIds
    },
    201
  );
}

async function parseJsonObject(
  request: Request
): Promise<{ ok: true; value: JsonObject } | { ok: false; error: string }> {
  try {
    const value: unknown = await request.json();
    if (!isJsonObject(value)) {
      return { ok: false, error: "JSON body must be an object." };
    }

    return { ok: true, value };
  } catch {
    return { ok: false, error: "Malformed JSON body." };
  }
}

function normalizeDeviceUploadPayload(
  payload: JsonObject
): { ok: true; value: DeviceUploadPayload } | { ok: false; code: string; error: string } {
  const deviceId = normalizeDeviceId(payload.device_id);
  if (!deviceId.ok) {
    return { ok: false, code: "invalid_device_id", error: deviceId.error };
  }

  const recordedAt = normalizePayloadTime(payload.time);
  if (!recordedAt.ok) {
    return { ok: false, code: "invalid_time", error: recordedAt.error };
  }

  if (!isJsonObject(payload.sensor_data)) {
    return { ok: false, code: "invalid_sensor_data", error: "sensor_data must be a non-empty JSON object." };
  }

  const sensors = Object.entries(payload.sensor_data);
  if (sensors.length === 0) {
    return { ok: false, code: "invalid_sensor_data", error: "sensor_data must contain at least one sensor." };
  }

  const sensorData = [];
  for (const [name, value] of sensors) {
    const sensorName = normalizeSensorName(name);
    if (!sensorName.ok) {
      return { ok: false, code: "invalid_sensor_name", error: sensorName.error };
    }

    if (value === undefined) {
      return { ok: false, code: "invalid_sensor_value", error: `Sensor ${name} has an unsupported value.` };
    }

    sensorData.push(normalizeSensorReading(sensorName.value, value));
  }

  return {
    ok: true,
    value: {
      deviceId: deviceId.value,
      sensorData,
      recordedAt: recordedAt.value
    }
  };
}

function normalizeDeviceId(rawValue: unknown): { ok: true; value: string } | { ok: false; error: string } {
  if (typeof rawValue !== "string" || rawValue.trim() === "") {
    return { ok: false, error: "device_id is required and must be a non-empty string." };
  }

  const value = rawValue.trim();
  if (value.length > DEVICE_ID_MAX_LENGTH) {
    return { ok: false, error: `Device id must be ${DEVICE_ID_MAX_LENGTH} characters or fewer.` };
  }

  if (!DEVICE_ID_PATTERN.test(value)) {
    return { ok: false, error: "Device id may contain only letters, numbers, dot, underscore, colon, and dash." };
  }

  return { ok: true, value };
}

function normalizeSensorName(value: string): { ok: true; value: string } | { ok: false; error: string } {
  const normalized = value.trim();
  if (normalized === "") {
    return { ok: false, error: "Sensor name must not be empty." };
  }

  if (normalized.length > SENSOR_NAME_MAX_LENGTH) {
    return { ok: false, error: `Sensor name must be ${SENSOR_NAME_MAX_LENGTH} characters or fewer.` };
  }

  if (!SENSOR_NAME_PATTERN.test(normalized)) {
    return { ok: false, error: "Sensor name may contain only letters, numbers, dot, underscore, colon, and dash." };
  }

  return { ok: true, value: normalized };
}

function normalizePayloadTime(value: unknown): { ok: true; value: string } | { ok: false; error: string } {
  if (typeof value === "string") {
    const date = new Date(value);
    if (!Number.isNaN(date.getTime())) {
      return { ok: true, value: date.toISOString() };
    }
  }

  if (typeof value === "number" && Number.isFinite(value)) {
    const milliseconds = value < 10_000_000_000 ? value * 1000 : value;
    const date = new Date(milliseconds);
    if (!Number.isNaN(date.getTime())) {
      return { ok: true, value: date.toISOString() };
    }
  }

  return { ok: false, error: "time must be an ISO timestamp string, Unix seconds, or Unix milliseconds." };
}

function normalizeSensorReading(name: string, value: unknown): DeviceUploadPayload["sensorData"][number] {
  return {
    name,
    data: JSON.stringify(value)
  };
}

function isJsonObject(value: unknown): value is JsonObject {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

function jsonResponse(body: JsonObject, status = 200): Response {
  return new Response(JSON.stringify(body), {
    status,
    headers: {
      "content-type": "application/json; charset=utf-8",
      ...corsHeaders()
    }
  });
}

function jsonError(code: string, message: string, status: number): Response {
  return jsonResponse(
    {
      ok: false,
      error: {
        code,
        message
      }
    },
    status
  );
}

function corsHeaders(): HeadersInit {
  return {
    "access-control-allow-origin": "*",
    "access-control-allow-methods": "GET,POST,OPTIONS",
    "access-control-allow-headers": "content-type,x-device-id"
  };
}