videosdk-server-sdk 0.1.0

//! Types shared across resources.

use std::collections::HashMap;

use serde::{Deserialize, Deserializer, Serialize};

/// HATEOAS-style links returned on many resources.
pub type ResourceLinks = HashMap<String, String>;

/// Deserializes an explicit JSON `null` as `T::default()`.
///
/// `#[serde(default)]` alone only covers a *missing* key — an explicit `null`
/// still fails with "invalid type: null". The API returns `null` where Go's
/// `encoding/json` would have silently produced a zero value, so every
/// defaulted field pairs this with `default`:
///
/// ```ignore
/// #[serde(default, deserialize_with = "null_to_default")]
/// pub name: String,
/// ```
pub(crate) fn null_to_default<'de, D, T>(deserializer: D) -> Result<T, D::Error>
where
    D: Deserializer<'de>,
    T: Deserialize<'de> + Default,
{
    Ok(Option::<T>::deserialize(deserializer)?.unwrap_or_default())
}

/// The plain `{message}` body returned by many action and delete endpoints.
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct MessageResponse {
    /// The server's confirmation message.
    pub message: String,
}

/// Defines an open string enum: a transparent newtype over a string, carrying
/// associated constants for the values the API documents today.
///
/// A closed `enum` would be nicer to match on, but it would also fail to
/// deserialize the moment the API returns a value this SDK predates — taking the
/// whole response down with it. These types round-trip anything.
macro_rules! string_enum {
    (
        $(#[$meta:meta])*
        $name:ident {
            $($(#[$variant_meta:meta])* $constant:ident => $value:literal),* $(,)?
        }
    ) => {
        $(#[$meta])*
        #[derive(Debug, Clone, PartialEq, Eq, Hash, ::serde::Serialize, ::serde::Deserialize)]
        #[serde(transparent)]
        pub struct $name(::std::borrow::Cow<'static, str>);

        impl $name {
            $($(#[$variant_meta])* pub const $constant: Self =
                Self(::std::borrow::Cow::Borrowed($value));)*

            /// The value as it appears on the wire.
            pub fn as_str(&self) -> &str {
                &self.0
            }
        }

        impl ::std::fmt::Display for $name {
            fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
                f.write_str(&self.0)
            }
        }

        impl AsRef<str> for $name {
            fn as_ref(&self) -> &str {
                &self.0
            }
        }

        impl From<&str> for $name {
            fn from(value: &str) -> Self {
                Self(::std::borrow::Cow::Owned(value.to_string()))
            }
        }

        impl From<String> for $name {
            fn from(value: String) -> Self {
                Self(::std::borrow::Cow::Owned(value))
            }
        }
    };
}

pub(crate) use string_enum;

string_enum! {
    /// A VideoSDK region code, accepted as a room's geo-fence.
    ///
    /// Any region string is accepted — the API may add regions this SDK
    /// predates — so this is a string newtype rather than a closed enum. The
    /// associated constants enumerate the currently known regions.
    ///
    /// ```
    /// # use videosdk::Region;
    /// assert_eq!(Region::US001.as_str(), "us001");
    /// assert_eq!(Region::from("mars001").as_str(), "mars001");
    /// ```
    Region {
        /// `us001`
        US001 => "us001",
        /// `uk001`
        UK001 => "uk001",
        /// `sg001`
        SG001 => "sg001",
        /// `eu001`
        EU001 => "eu001",
        /// `uae001`
        UAE001 => "uae001",
        /// `in001`
        IN001 => "in001",
        /// `in002`
        IN002 => "in002",
        /// `in003`
        IN003 => "in003",
        /// `sg002`
        SG002 => "sg002",
        /// `us002`
        US002 => "us002",
        /// `aus001`
        AUS001 => "aus001",
        /// `dev1`
        DEV1 => "dev1",
    }
}

/* ---------------------------- composition layout ---------------------------- */

/// A composition layout style, as it appears on the wire.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "UPPERCASE")]
pub enum LayoutType {
    /// Highlights the active participant.
    Spotlight,
    /// A main stage with a sidebar of participants.
    Sidebar,
    /// An even grid of participants.
    Grid,
}

/// Which participant a layout prioritizes.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "UPPERCASE")]
pub enum LayoutPriority {
    /// Prioritize whoever is speaking.
    Speaker,
    /// Prioritize the pinned participant.
    Pin,
}

/// A composition's orientation.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum Orientation {
    /// Taller than wide.
    Portrait,
    /// Wider than tall.
    Landscape,
}

/// A composition's theme.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "UPPERCASE")]
pub enum Theme {
    /// A dark theme.
    Dark,
    /// A light theme.
    Light,
    /// The account's default theme.
    Default,
}

/// A recorder quality tier.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum CompositionQuality {
    /// Lowest bitrate.
    Low,
    /// Medium bitrate.
    Med,
    /// High bitrate.
    High,
    /// Highest bitrate.
    Ultra,
}

/// The wire layout configuration of a composition.
#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct LayoutConfig {
    /// The layout style.
    #[serde(rename = "type", skip_serializing_if = "Option::is_none")]
    pub kind: Option<LayoutType>,
    /// Which participant the layout prioritizes.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub priority: Option<LayoutPriority>,
    /// The number of tiles in a grid layout: 0-25, defaulting to 25.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub grid_size: Option<u32>,
}

/// The wire composition configuration, shared by recording, HLS and livestream.
#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CompositionConfig {
    /// The layout configuration.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub layout: Option<LayoutConfig>,
    /// The composition's orientation.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub orientation: Option<Orientation>,
    /// The composition's theme.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub theme: Option<Theme>,
    /// The recorder quality tier.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub quality: Option<CompositionQuality>,
}

impl CompositionConfig {
    /// Whether no field is set, i.e. this would serialize to `{}`.
    pub fn is_empty(&self) -> bool {
        self.layout.is_none()
            && self.orientation.is_none()
            && self.theme.is_none()
            && self.quality.is_none()
    }
}

/* -------------------------------- transcription ------------------------------ */

/// A post-call AI summary configuration. Requires transcription to be enabled.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct SummaryConfig {
    /// Whether to generate a summary.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub enabled: Option<bool>,
    /// A prompt steering the summary.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub prompt: Option<String>,
}

/// A real-time transcription configuration.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct TranscriptionConfig {
    /// Whether to transcribe.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub enabled: Option<bool>,
    /// A post-call summary configuration.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub summary: Option<SummaryConfig>,
}

/// The behavior applied when a composition fails.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct OnFailureConfig {
    /// The action to take. Currently only `close-room` is supported.
    pub action: String,
    /// Seconds to wait before applying the action. Capped at 150, default 150.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub wait_time: Option<u32>,
}

impl OnFailureConfig {
    /// Close the room if the composition fails.
    pub fn close_room(wait_time: Option<u32>) -> Self {
        Self {
            action: "close-room".to_string(),
            wait_time,
        }
    }
}

/* -------------------------------- file formats ------------------------------- */

/// The file format of a room or composite recording.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum RecordingFileFormat {
    /// MPEG-4. The default.
    Mp4,
    /// WebM.
    Webm,
}

/// The file format of a participant recording.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum ParticipantFileFormat {
    /// MPEG-4.
    Mp4,
    /// WebM. The default.
    Webm,
    /// An HLS playlist.
    M3u8,
}

/// The file format of a track recording.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum TrackFileFormat {
    /// MPEG-4.
    Mp4,
    /// WebM. The default.
    Webm,
    /// An HLS playlist.
    M3u8,
    /// MP3 audio.
    Mp3,
}

/// The media kind of a track recording.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum TrackKind {
    /// The participant's microphone.
    Audio,
    /// The participant's camera.
    Video,
    /// Audio shared with the screen.
    ScreenAudio,
    /// The shared screen.
    ScreenVideo,
}

/// A produced recording or output file.
#[derive(Debug, Clone, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RecordingFile {
    /// Where the file can be downloaded.
    pub file_url: Option<String>,
    /// Any fields the server returned that this SDK does not model yet.
    #[serde(flatten)]
    pub extra: serde_json::Map<String, serde_json::Value>,
}

/// A single webhook delivery attempt.
#[derive(Debug, Clone, Deserialize)]
pub struct WebhookDelivery {
    /// The event type that was delivered.
    #[serde(rename = "type")]
    pub kind: String,
    /// Whether the delivery succeeded.
    pub success: bool,
}

/// A summary of a resource's webhook delivery attempts.
#[derive(Debug, Clone, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct WebhookDeliverySummary {
    /// How many deliveries were attempted.
    #[serde(default, deserialize_with = "crate::common::null_to_default")]
    pub total_count: u32,
    /// How many deliveries succeeded.
    #[serde(default, deserialize_with = "crate::common::null_to_default")]
    pub success_count: u32,
    /// The individual delivery attempts.
    #[serde(default, deserialize_with = "crate::common::null_to_default")]
    pub data: Vec<WebhookDelivery>,
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde_json::json;

    #[test]
    fn enums_use_the_wire_casing_the_api_expects() {
        assert_eq!(
            serde_json::to_value(LayoutType::Grid).unwrap(),
            json!("GRID")
        );
        assert_eq!(
            serde_json::to_value(LayoutPriority::Speaker).unwrap(),
            json!("SPEAKER")
        );
        assert_eq!(
            serde_json::to_value(Orientation::Portrait).unwrap(),
            json!("portrait")
        );
        assert_eq!(serde_json::to_value(Theme::Dark).unwrap(), json!("DARK"));
        assert_eq!(
            serde_json::to_value(CompositionQuality::Ultra).unwrap(),
            json!("ultra")
        );
        assert_eq!(
            serde_json::to_value(TrackKind::ScreenAudio).unwrap(),
            json!("screen_audio")
        );
        assert_eq!(
            serde_json::to_value(TrackFileFormat::M3u8).unwrap(),
            json!("m3u8")
        );
        assert_eq!(
            serde_json::to_value(RecordingFileFormat::Mp4).unwrap(),
            json!("mp4")
        );
    }

    #[test]
    fn layout_config_serializes_type_not_kind() {
        let config = LayoutConfig {
            kind: Some(LayoutType::Sidebar),
            priority: Some(LayoutPriority::Pin),
            grid_size: None,
        };
        assert_eq!(
            serde_json::to_value(config).unwrap(),
            json!({"type": "SIDEBAR", "priority": "PIN"})
        );
    }

    #[test]
    fn an_empty_composition_config_is_empty() {
        assert!(CompositionConfig::default().is_empty());
        assert!(!CompositionConfig {
            theme: Some(Theme::Light),
            ..Default::default()
        }
        .is_empty());
    }

    #[test]
    fn on_failure_helper_builds_the_documented_action() {
        assert_eq!(
            serde_json::to_value(OnFailureConfig::close_room(Some(30))).unwrap(),
            json!({"action": "close-room", "waitTime": 30})
        );
    }

    #[test]
    fn region_is_transparent_on_the_wire() {
        assert_eq!(serde_json::to_value(Region::IN002).unwrap(), json!("in002"));
        let parsed: Region = serde_json::from_value(json!("us001")).unwrap();
        assert_eq!(parsed, Region::US001);
    }

    #[test]
    fn an_unknown_region_round_trips() {
        let parsed: Region = serde_json::from_value(json!("future-region")).unwrap();
        assert_eq!(parsed.as_str(), "future-region");
        assert_eq!(
            serde_json::to_value(&parsed).unwrap(),
            json!("future-region")
        );
    }
}