#include "growatt_solar.h"
#include "esphome/core/application.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"

namespace esphome {
namespace growatt_solar {

static const char *const TAG = "growatt_solar";

static const uint8_t MODBUS_CMD_READ_IN_REGISTERS = 0x04;
static const uint8_t MODBUS_REGISTER_COUNT[] = {33, 95};  // indexed with enum GrowattProtocolVersion

void GrowattSolar::loop() {
  // If update() was unable to send we retry until we can send.
  if (!this->waiting_to_update_)
    return;
  update();
}

void GrowattSolar::update() {
  // If our last send has had no reply yet, and it wasn't that long ago, do nothing.
  const uint32_t now = App.get_loop_component_start_time();
  if (now - this->last_send_ < this->get_update_interval() / 2) {
    return;
  }

  // The bus might be slow, or there might be other devices, or other components might be talking to our device.
  if (this->waiting_for_response()) {
    this->waiting_to_update_ = true;
    return;
  }

  this->waiting_to_update_ = false;
  this->send(MODBUS_CMD_READ_IN_REGISTERS, 0, MODBUS_REGISTER_COUNT[this->protocol_version_]);
  this->last_send_ = millis();
}

void GrowattSolar::on_modbus_data(const std::vector<uint8_t> &data) {
  // Other components might be sending commands to our device. But we don't get called with enough
  // context to know what is what. So if we didn't do a send, we ignore the data.
  if (!this->last_send_)
    return;
  this->last_send_ = 0;

  // Also ignore the data if the message is too short. Otherwise we will publish invalid values.
  if (data.size() < MODBUS_REGISTER_COUNT[this->protocol_version_] * 2)
    return;

  auto publish_1_reg_sensor_state = [&](sensor::Sensor *sensor, size_t i, float unit) -> void {
    if (sensor == nullptr)
      return;
    float value = encode_uint16(data[i * 2], data[i * 2 + 1]) * unit;
    sensor->publish_state(value);
  };

  auto publish_2_reg_sensor_state = [&](sensor::Sensor *sensor, size_t reg1, size_t reg2, float unit) -> void {
    float value = ((encode_uint16(data[reg1 * 2], data[reg1 * 2 + 1]) << 16) +
                   encode_uint16(data[reg2 * 2], data[reg2 * 2 + 1])) *
                  unit;
    if (sensor != nullptr)
      sensor->publish_state(value);
  };

  switch (this->protocol_version_) {
    case RTU: {
      publish_1_reg_sensor_state(this->inverter_status_, 0, 1);

      publish_2_reg_sensor_state(this->pv_active_power_sensor_, 1, 2, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->pvs_[0].voltage_sensor_, 3, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->pvs_[0].current_sensor_, 4, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->pvs_[0].active_power_sensor_, 5, 6, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->pvs_[1].voltage_sensor_, 7, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->pvs_[1].current_sensor_, 8, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->pvs_[1].active_power_sensor_, 9, 10, ONE_DEC_UNIT);

      publish_2_reg_sensor_state(this->grid_active_power_sensor_, 11, 12, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->grid_frequency_sensor_, 13, TWO_DEC_UNIT);

      publish_1_reg_sensor_state(this->phases_[0].voltage_sensor_, 14, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->phases_[0].current_sensor_, 15, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->phases_[0].active_power_sensor_, 16, 17, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->phases_[1].voltage_sensor_, 18, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->phases_[1].current_sensor_, 19, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->phases_[1].active_power_sensor_, 20, 21, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->phases_[2].voltage_sensor_, 22, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->phases_[2].current_sensor_, 23, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->phases_[2].active_power_sensor_, 24, 25, ONE_DEC_UNIT);

      publish_2_reg_sensor_state(this->today_production_, 26, 27, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->total_energy_production_, 28, 29, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->inverter_module_temp_, 32, ONE_DEC_UNIT);
      break;
    }
    case RTU2: {
      publish_1_reg_sensor_state(this->inverter_status_, 0, 1);

      publish_2_reg_sensor_state(this->pv_active_power_sensor_, 1, 2, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->pvs_[0].voltage_sensor_, 3, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->pvs_[0].current_sensor_, 4, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->pvs_[0].active_power_sensor_, 5, 6, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->pvs_[1].voltage_sensor_, 7, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->pvs_[1].current_sensor_, 8, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->pvs_[1].active_power_sensor_, 9, 10, ONE_DEC_UNIT);

      publish_2_reg_sensor_state(this->grid_active_power_sensor_, 35, 36, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->grid_frequency_sensor_, 37, TWO_DEC_UNIT);

      publish_1_reg_sensor_state(this->phases_[0].voltage_sensor_, 38, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->phases_[0].current_sensor_, 39, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->phases_[0].active_power_sensor_, 40, 41, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->phases_[1].voltage_sensor_, 42, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->phases_[1].current_sensor_, 43, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->phases_[1].active_power_sensor_, 44, 45, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->phases_[2].voltage_sensor_, 46, ONE_DEC_UNIT);
      publish_1_reg_sensor_state(this->phases_[2].current_sensor_, 47, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->phases_[2].active_power_sensor_, 48, 49, ONE_DEC_UNIT);

      publish_2_reg_sensor_state(this->today_production_, 53, 54, ONE_DEC_UNIT);
      publish_2_reg_sensor_state(this->total_energy_production_, 55, 56, ONE_DEC_UNIT);

      publish_1_reg_sensor_state(this->inverter_module_temp_, 93, ONE_DEC_UNIT);
      break;
    }
  }
}

void GrowattSolar::dump_config() {
  ESP_LOGCONFIG(TAG,
                "GROWATT Solar:\n"
                "  Address: 0x%02X",
                this->address_);
}

}  // namespace growatt_solar
}  // namespace esphome