# @module
# @desc  Home Assistant helper

import json

var ha = module("ha")

ha.init = def(url, token)
   ha.base = url
   ha.token = token
end

# Internal request options
ha.options = def()
  return {
    "headers": {
      "Authorization": "Bearer " + ha.token,
      "Content-Type": "application/json"
    }
  }
end


# ha.entity(entity_id, cb)
#
# cb(data, error)
#
# data:
# {
#   "entity_id": "...",
#   "state": "...",
#   "attributes": {...}
# }
ha.entity = def(entity_id, cb)
  var url = ha.base + "/api/states/" + entity_id

  http.get(url, def(body, status)
    if status != 200
      cb(nil, "http " + str(status))
      return
    end

    if body == nil
      cb(nil, "empty response")
      return
    end

    var data = json.load(body)

    if data == nil
      cb(nil, "bad json")
      return
    end

    if !isinstance(data, map)
      cb(nil, "invalid response")
      return
    end

    cb(data, nil)
  end, ha.options())
end


# ha.state(entity_id, cb)
#
# cb(value, error)
#
# Home Assistant state.
ha.state = def(entity_id, cb)
  ha.entity(entity_id, def(data, error)
    if error != nil
      cb(nil, error)
      return
    end

    var value = data.find("state")

    if value == nil
      cb(nil, "state not found")
      return
    end

    cb(value, nil)
  end)
end


# ha.attribute(entity_id, attribute_name, cb)
#
# cb(value, error)
ha.attribute = def(entity_id, attribute_name, cb)
  ha.entity(entity_id, def(data, error)
    if error != nil
      cb(nil, error)
      return
    end

    var attrs = data.find("attributes")

    if attrs == nil || !isinstance(attrs, map)
      cb(nil, "attributes not found")
      return
    end

    var value = attrs.find(attribute_name)

    if value == nil
      cb(nil, "attribute not found: " + attribute_name)
      return
    end

    cb(value, nil)
  end)
end


# ha.number(entity_id, cb)
#
# Отримує state to real.
ha.number = def(entity_id, cb)
  ha.state(entity_id, def(value, error)
    if error != nil
      cb(nil, error)
      return
    end

    try
      cb(real(value), nil)
    except
      cb(nil, "state is not numeric: " + str(value))
    end
  end)
end

# ha.int(entity_id, cb)
#
# Отримує state to int
ha.int = def(entity_id, cb)
  ha.number(entity_id, def(value, error)
    if error != nil
      cb(nil, error)
      return
    end

    if value >= 0
      cb(int(value + 0.5), nil)
    else
      cb(int(value - 0.5), nil)
    end
  end)
end


# ha.attribute_number(entity_id, attribute_name, cb)
#
# Attr as real.
ha.attribute_number = def(entity_id, attribute_name, cb)
  ha.attribute(entity_id, attribute_name, def(value, error)
    if error != nil
      cb(nil, error)
      return
    end

    try
      cb(real(value), nil)
    except
      cb(nil, "attribute is not numeric: " + str(value))
    end
  end)
end


# ha.attribute_int(entity_id, attribute_name, cb)
#
# Attr as int.
ha.attribute_int = def(entity_id, attribute_name, cb)
  ha.attribute_number(entity_id, attribute_name, def(value, error)
    if error != nil
      cb(nil, error)
      return
    end

    if value >= 0
      cb(int(value + 0.5), nil)
    else
      cb(int(value - 0.5), nil)
    end
  end)
end


# ha.call(domain, service, data, cb, return_response)
#
# cb(data, error)
#
# Generic Home Assistant service call.
# When return_response is true, returns service_response if HA provides it.
ha.call = def(domain, service, data, cb, return_response)
  if data == nil
    data = {}
  end

  var url = ha.base + "/api/services/" + domain + "/" + service

  if return_response
    url = url + "?return_response"
  end

  var body = json.dump(data)
  var options = ha.options()

  # ha.options() уже має Authorization.
  # Додаємо обов'язковий тип POST body.
  var headers = options.find("headers")

  if !isinstance(headers, map)
    headers = {}
    options["headers"] = headers
  end

  headers["Content-Type"] = "application/json"

  log("POST " + url)
  log("BODY " + body)

  http.post(
    url,
    body,
    def(response_body, status)
      log("STATUS " + str(status))
      log("RESPONSE " + str(response_body))

      if response_body == nil
        cb(nil, "HA request failed: " + str(status))
        return
      end

      var response = nil

      try
        response = json.load(response_body)
      except
        cb(nil, "HA returned invalid JSON")
        return
      end

      if !isinstance(response, map)
        cb(nil, "HA returned invalid response")
        return
      end

      if return_response
        var service_response = response.find("service_response")

        if service_response == nil
          cb(nil, "service_response not found")
          return
        end

        cb(service_response, nil)
        return
      end

      cb(response, nil)
    end,
    options
  )
end


# ha.weather_forecasts(entity_id, forecast_type, cb)
#
# cb(service_response, error)
# forecast_type: "hourly", "daily" or "twice_daily"
ha.weather_forecasts = def(entity_id, forecast_type, cb)
  ha.call(
    "weather",
    "get_forecasts",
    {
      "entity_id": entity_id,
      "type": forecast_type
    },
    cb,
    true
  )
end

return ha