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blueprint:
  name: Violet Pool - Heat Pump Heating & Cooling
  description: |
    Regulates the pool temperature in BOTH directions with a heat pump that can
    heat and cool.

    Why this blueprint exists: the Violet Pool Controller has no cooling
    function - its API only knows the HEATER and SOLAR outputs, both of which
    heat. Its climate entities therefore never offer a "cool" mode. A heat pump
    that can cool is controlled through its own integration, so the two are
    tied together here in an automation instead of inside the Violet
    integration.

    What it does:
    - One target temperature (an input_number helper) is the single source of
      truth. Every change is written through to the heat pump, so the value you
      see in Home Assistant is the value the heat pump regulates to.
    - Pool warmer than target + hysteresis  -> heat pump to "cool"
    - Pool colder than target - hysteresis  -> heat pump to "heat"
    - Inside the deadband                   -> configurable idle mode
    - Optionally holds the Violet heater setpoint at a high release temperature
      so the controller keeps the valve open and the heat pump sees flow. This
      replaces the manual workaround of leaving a misleading high setpoint in
      the Violet UI.

    REQUIRED:
    - input_number helper for the target temperature
      (Settings -> Devices & Services -> Helpers -> Number)

    VERSION: 1.0.0 (2026-08-17)
  domain: automation
  source_url: https://github.com/xerolux/violet-hass/blob/main/blueprints/automation/pool_heatpump_cooling.yaml
  homeassistant:
    min_version: "2026.1.0"
  input:
    pool_temperature_sensor:
      name: Pool Temperature Sensor
      description: Sensor for the current pool temperature
      selector:
        entity:
          filter:
            - integration: violet_pool_controller
            - domain: sensor
            - device_class: temperature
    heat_pump:
      name: Heat Pump
      description: >
        Climate entity of the heat pump (from its own integration, not from the
        Violet controller). It must support the heat and cool modes.
      selector:
        entity:
          filter:
            - domain: climate
    target_temperature_helper:
      name: Target Temperature Helper
      description: >
        input_number helper holding the desired pool temperature. Put this on
        your dashboard - it is the only place you set the temperature.
      selector:
        entity:
          filter:
            - domain: input_number
    hysteresis:
      name: Hysteresis
      description: >
        How far the pool may drift from the target before heating or cooling
        starts. Too small a value makes the heat pump switch direction
        constantly.
      default: 0.5
      selector:
        number:
          min: 0.2
          max: 3.0
          step: 0.1
          unit_of_measurement: °C
          mode: slider
    cooling_enabled:
      name: Allow Cooling
      description: Turn off to use this automation for heating only
      default: true
      selector:
        boolean:
    idle_mode:
      name: Mode Inside the Deadband
      description: >
        What the heat pump should do once the target is reached. "unchanged"
        leaves whatever mode it is in.
      default: "auto"
      selector:
        select:
          options:
            - "auto"
            - "heat_cool"
            - "off"
            - "unchanged"
    violet_heater:
      name: Violet Heater (Optional)
      description: >
        Climate entity of the Violet heater. When set, its setpoint is held at
        the release temperature below so the controller enables the flow the
        heat pump needs. Leave empty if your installation does not need it.
      default: ""
      selector:
        entity:
          filter:
            - integration: violet_pool_controller
            - domain: climate
          multiple: false
    release_temperature:
      name: Release Temperature
      description: >
        Setpoint written to the Violet heater so it keeps the valve open. Only
        used when a Violet heater is selected above.
      default: 40
      selector:
        number:
          min: 20
          max: 40
          step: 0.5
          unit_of_measurement: °C
          mode: slider
    enable_switch:
      name: Enable Switch (Optional)
      description: Automation only runs while this switch is on
      default: ""
      selector:
        entity:
          filter:
            - domain:
                - input_boolean
                - switch
          multiple: false
    notification_entity:
      name: Notification Service (Optional)
      description: Service for notifications (e.g. notify.mobile_app_phone)
      default: ""
      selector:
        text:

variables:
  pool_temp_sensor: !input pool_temperature_sensor
  heat_pump_entity: !input heat_pump
  target_helper: !input target_temperature_helper
  hysteresis_value: !input hysteresis
  cooling_allowed: !input cooling_enabled
  idle_hvac_mode: !input idle_mode
  violet_heater_entity: !input violet_heater
  release_temp: !input release_temperature
  gate_entity: !input enable_switch
  notify_service: !input notification_entity

  current_temp: "{{ states(pool_temp_sensor) | float(0) }}"
  target_temp: "{{ states(target_helper) | float(0) }}"

  # Modes the heat pump actually advertises - never send one it does not have.
  supported_modes: "{{ state_attr(heat_pump_entity, 'hvac_modes') | default([], true) }}"
  can_cool: "{{ cooling_allowed and 'cool' in supported_modes }}"

  # The heat pump's own setpoint, so it is only rewritten when it differs.
  pump_target: "{{ state_attr(heat_pump_entity, 'temperature') | float(-999) }}"
  target_needs_sync: "{{ (pump_target - target_temp) | abs > 0.05 }}"

  wants_cooling: "{{ current_temp > (target_temp + hysteresis_value) }}"
  wants_heating: "{{ current_temp < (target_temp - hysteresis_value) }}"

triggers:
  - trigger: state
    entity_id: !input pool_temperature_sensor
    for:
      minutes: 2
    id: pool_temp
    not_to:
      - "unavailable"
      - "unknown"
  - trigger: state
    entity_id: !input target_temperature_helper
    id: target_changed
  - trigger: time_pattern
    minutes: /15
    id: periodic_check
  - trigger: homeassistant
    event: start
    id: ha_start

conditions:
  # Gate switch off -> do nothing at all.
  - condition: template
    value_template: >
      {{ gate_entity in [none, ''] or is_state(gate_entity, 'on') }}
  # Never act on stale readings; a wrong value would send the pump the wrong way.
  - condition: template
    value_template: >
      {{ states(pool_temp_sensor) not in ['unavailable', 'unknown', 'none', ''] and
         states(target_helper) not in ['unavailable', 'unknown', 'none', ''] and
         states(heat_pump_entity) not in ['unavailable', 'unknown'] }}

actions:
  # --- 1. The target temperature in Home Assistant IS the heat pump's target ---
  - if:
      - condition: template
        value_template: "{{ target_needs_sync }}"
    then:
      - action: climate.set_temperature
        target:
          entity_id: !input heat_pump
        data:
          temperature: "{{ target_temp }}"

  # --- 2. Keep the Violet controller's valve open, if configured ---
  - if:
      - condition: template
        value_template: >
          {{ violet_heater_entity not in [none, ''] and
             (state_attr(violet_heater_entity, 'temperature') | float(-999) - release_temp) | abs > 0.05 }}
    then:
      - action: climate.set_temperature
        target:
          entity_id: "{{ violet_heater_entity }}"
        data:
          temperature: "{{ release_temp }}"

  # --- 3. Decide the direction ---
  - choose:
      # Too warm -> cool
      - conditions:
          - condition: template
            value_template: "{{ wants_cooling and can_cool }}"
        sequence:
          - if:
              - condition: template
                value_template: "{{ not is_state(heat_pump_entity, 'cool') }}"
            then:
              - action: climate.set_hvac_mode
                target:
                  entity_id: !input heat_pump
                data:
                  hvac_mode: cool
              - if:
                  - condition: template
                    value_template: "{{ notify_service != '' }}"
                then:
                  - action: "{{ notify_service }}"
                    data:
                      title: "❄️ Pool Cooling"
                      message: >
                        {{ current_temp }}°C is above the target of
                        {{ target_temp }}°C - heat pump set to cooling.

      # Too cold -> heat
      - conditions:
          - condition: template
            value_template: "{{ wants_heating and 'heat' in supported_modes }}"
        sequence:
          - if:
              - condition: template
                value_template: "{{ not is_state(heat_pump_entity, 'heat') }}"
            then:
              - action: climate.set_hvac_mode
                target:
                  entity_id: !input heat_pump
                data:
                  hvac_mode: heat
              - if:
                  - condition: template
                    value_template: "{{ notify_service != '' }}"
                then:
                  - action: "{{ notify_service }}"
                    data:
                      title: "🔥 Pool Heating"
                      message: >
                        {{ current_temp }}°C is below the target of
                        {{ target_temp }}°C - heat pump set to heating.

    # Inside the deadband -> idle mode
    default:
      - if:
          - condition: template
            value_template: >
              {{ idle_hvac_mode != 'unchanged' and
                 idle_hvac_mode in supported_modes and
                 not is_state(heat_pump_entity, idle_hvac_mode) }}
        then:
          - action: climate.set_hvac_mode
            target:
              entity_id: !input heat_pump
            data:
              hvac_mode: "{{ idle_hvac_mode }}"

mode: single
max_exceeded: silent

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//////////////////////////////////////////////////////////////////////////////
// Formula for CSI calculation
// 1. step: calc. pHs:
// pHs = 9.3 + A + B - C - D;
//
// 2nd step: calc. CSI:
// CSI = pH - pHs;
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////
// needed values:
// pH            -> pH-Wert
// temperature   -> Temperatur in °C
// tds           -> TDS in mg/l
// calcium       -> Calciumhärte in mg/l als CaCO₃ (NICHT die Gesamthärte)
// alkalinity    -> Gesamtalkalität in mg/l als CaCO₃
// cya           -> Cyanursäure in mg/l
//////////////////////////////////////////////////////////////////////////////

// Cyanursäure reduziert die für die Kalksättigung verfügbare Alkalinität.
// Näherungswert, passend für den üblichen Pool-pH-Bereich.
const carbonateAlkalinity = alkalinity - (cya / 3);

// calculate factors A, B, C & D
const A = (Math.log10(tds) - 1) / 10;
const B = -13.12 * Math.log10(temperature + 273) + 34.55;
const C = Math.log10(calcium) - 0.4;
const D = Math.log10(carbonateAlkalinity);

// pHs
const pHs = 9.3 + A + B - C - D;

// CSI
const CSI = pH - pHs;

// Interpretation
// CSI < -0.5)  -> deutlich korrosiv / aggressiv;
// CSI < 0)     -> leicht korrosiv;
// CSI <= 0.3)  -> ausgeglichen;
// CSI <= 0.5)  -> leichte Scaling-Tendenz (Kalkabscheidungen);
// CSI > 0.5     -> starke Scaling-Tendenz;