tapo 0.9.0

Unofficial Tapo API Client. Works with TP-Link Tapo smart devices. Tested with light bulbs (L510, L520, L530, L535, L610, L630), light strips (L900, L920, L930), plugs (P100, P105, P110, P110M, P115), power strips (P300, P304M, P306, P316M), hubs (H100), switches (S200B, S200D, S210) and sensors (KE100, T100, T110, T300, T310, T315).
Documentation 
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use serde::Serialize;
use tokio::sync::RwLockReadGuard;

use crate::api::ApiClientExt;
use crate::error::Error;

/// Builder that is used by the [`crate::LightHandler::set`] API to set multiple properties in a single request.
#[derive(Debug, Serialize)]
pub(crate) struct LightSetDeviceInfoParams<'a> {
    #[serde(skip)]
    client: RwLockReadGuard<'a, dyn ApiClientExt>,
    #[serde(skip_serializing_if = "Option::is_none")]
    device_on: Option<bool>,
    #[serde(skip_serializing_if = "Option::is_none")]
    brightness: Option<u8>,
}

impl LightSetDeviceInfoParams<'_> {
    /// Sets the *brightness*. [`LightSetDeviceInfoParams::send`] must be called at the end to apply the changes.
    ///
    /// # Arguments
    ///
    /// * `brightness` - between 1 and 100
    pub fn brightness(mut self, value: u8) -> Self {
        self.brightness = Some(value);
        self
    }

    /// Performs a request to apply the changes to the device.
    pub async fn send(self) -> Result<(), Error> {
        self.validate()?;
        let json = serde_json::to_value(&self)?;
        self.client.set_device_info(json).await
    }
}

impl<'a> LightSetDeviceInfoParams<'a> {
    pub(crate) fn new(client: RwLockReadGuard<'a, dyn ApiClientExt>) -> Self {
        Self {
            client,
            device_on: None,
            brightness: None,
        }
    }

    fn validate(&self) -> Result<(), Error> {
        if self.device_on.is_none() && self.brightness.is_none() {
            return Err(Error::Validation {
                field: "DeviceInfoParams".to_string(),
                message: "Requires at least one property".to_string(),
            });
        }

        if let Some(brightness) = self.brightness
            && !(1..=100).contains(&brightness)
        {
            return Err(Error::Validation {
                field: "brightness".to_string(),
                message: "Must be between 1 and 100".to_string(),
            });
        }

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use async_trait::async_trait;
    use tokio::sync::RwLock;

    use crate::HandlerExt;

    use super::*;

    #[derive(Debug)]
    struct MockApiClient;

    #[async_trait]
    impl ApiClientExt for MockApiClient {
        async fn set_device_info(&self, _: serde_json::Value) -> Result<(), Error> {
            Ok(())
        }
        async fn device_reboot(&self, _: u16) -> Result<(), Error> {
            unimplemented!()
        }
        async fn device_reset(&self) -> Result<(), Error> {
            unimplemented!()
        }
    }

    struct MockHandler {
        client: RwLock<MockApiClient>,
    }

    impl MockHandler {
        fn new() -> Self {
            Self {
                client: RwLock::new(MockApiClient),
            }
        }
    }

    #[async_trait]
    impl HandlerExt for MockHandler {
        async fn get_client(&self) -> RwLockReadGuard<'_, dyn ApiClientExt> {
            RwLockReadGuard::map(
                self.client.read().await,
                |client: &MockApiClient| -> &dyn ApiClientExt { client },
            )
        }
    }

    #[tokio::test]
    async fn no_property_validation() {
        let handler = MockHandler::new();
        let client = handler.get_client().await;

        let params = LightSetDeviceInfoParams::new(client);
        let result = params.send().await;
        assert!(matches!(
            result.err(),
            Some(Error::Validation { field, message }) if field == "DeviceInfoParams" && message == "Requires at least one property"
        ));
    }

    #[tokio::test]
    async fn brightness_validation() {
        let handler = MockHandler::new();
        let client = handler.get_client().await;

        let params = LightSetDeviceInfoParams::new(client);
        let result = params.brightness(0).send().await;
        assert!(matches!(
            result.err(),
            Some(Error::Validation { field, message }) if field == "brightness" && message == "Must be between 1 and 100"
        ));

        let client = handler.get_client().await;
        let params = LightSetDeviceInfoParams::new(client);
        let result = params.brightness(101).send().await;
        assert!(matches!(
            result.err(),
            Some(Error::Validation { field, message }) if field == "brightness" && message == "Must be between 1 and 100"
        ));
    }
}