use serde::{Deserialize, Serialize};
use ts_rs::TS;

use crate::app_state::database::models::{
    DeviceId, DocumentId, DocumentVersionWithoutContent, VaultUpdateId,
};

#[derive(TS, Deserialize, Clone, Debug)]
#[serde(rename_all = "camelCase")]
pub struct WebSocketHandshake {
    pub token: String,
    pub device_id: DeviceId,

    #[ts(type = "number | null")]
    pub last_seen_vault_update_id: Option<VaultUpdateId>,
}

#[derive(TS, Deserialize, Clone, Debug)]
#[serde(rename_all = "camelCase")]
pub struct CursorPositionFromClient {
    pub documents_with_cursors: Vec<DocumentWithCursors>,
}

#[derive(TS, Serialize, Deserialize, Clone, Debug)]
#[serde(rename_all = "camelCase")]
pub struct DocumentWithCursors {
    // It's None in case the document is dirty.
    // We still want to sync the cursor to mark
    // that it exists and can be client-side
    // interpolated. However, the actual
    // position is meaningless.
    #[ts(type = "number | null")]
    pub vault_update_id: Option<VaultUpdateId>,

    pub document_id: DocumentId,
    pub relative_path: String,
    pub cursors: Vec<CursorSpan>,
}

#[derive(TS, Serialize, Deserialize, Clone, Debug)]
#[serde(rename_all = "camelCase")]
pub struct CursorSpan {
    pub start: usize,
    pub end: usize,
}

#[derive(TS, Serialize, Clone, Debug)]
#[serde(rename_all = "camelCase")]
pub struct ClientCursors {
    pub user_name: String,
    pub device_id: DeviceId,
    pub documents_with_cursors: Vec<DocumentWithCursors>,
}

#[derive(TS, Serialize, Clone, Debug)]
#[serde(rename_all = "camelCase")]
pub struct CursorPositionFromServer {
    pub clients: Vec<ClientCursors>,
}

// One committed version. Non-delete updates are broadcast to every
// connected client *except* the device that authored them — that
// device already has the new state via its HTTP response. Deletes are
// broadcast to every client including the author: the author keeps
// the document in its sync queue until this receipt arrives so a late
// remote update can't sneak in between the HTTP response and the
// queue cleanup. The server also emits these one-at-a-time to catch
// up a freshly-connected client on versions committed while it was
// offline, in ascending `vault_update_id` order.
#[derive(TS, Serialize, Clone, Debug)]
#[serde(rename_all = "camelCase")]
pub struct WebSocketVaultUpdate {
    pub document: DocumentVersionWithoutContent,
}

#[derive(TS, Deserialize, Clone, Debug)]
#[serde(rename_all = "camelCase", tag = "type")]
#[ts(export)]
pub enum WebSocketClientMessage {
    Handshake(WebSocketHandshake),
    CursorPositions(CursorPositionFromClient),
}

#[derive(TS, Serialize, Clone, Debug)]
#[serde(rename_all = "camelCase", tag = "type")]
#[ts(export)]
pub enum WebSocketServerMessage {
    VaultUpdate(WebSocketVaultUpdate),
    CursorPositions(CursorPositionFromServer),
}

/// Broadcast envelope carrying the message plus the device that produced
/// it. The per-recipient send task compares `origin_device_id` against
/// its own device id to fill in `originates_from_self` before the message
/// is serialized on the wire.
#[derive(Clone, Debug)]
pub struct WebSocketServerMessageWithOrigin {
    pub origin_device_id: Option<DeviceId>,
    pub message: WebSocketServerMessage,
}

impl WebSocketServerMessageWithOrigin {
    pub fn new(message: WebSocketServerMessage) -> Self {
        Self {
            origin_device_id: None,
            message,
        }
    }

    pub fn with_origin(origin_device_id: DeviceId, message: WebSocketServerMessage) -> Self {
        Self {
            origin_device_id: Some(origin_device_id),
            message,
        }
    }
}