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use crate::error::{CaError, CaResult};
use crate::server::record::{MENU_YES_NO, Record};
use crate::types::{EpicsValue, PvString};
/// `event` record — software-event source.
///
/// C parity (`eventRecord.dbd.pod:71` `field(VAL,DBF_STRING)`,
/// `eventRecord.c:107-132`): `VAL` is the *event name* string. On
/// every `process()` the record posts that named event via
/// `postEvent(eventNameToHandle(prec->val))`, waking every
/// `SCAN="Event"` record whose `EVNT` matches. Posting the event is
/// the record's entire purpose.
///
/// The framework (`processing.rs`) reads `VAL` after `process()` and
/// routes the event through [`PvDatabase::post_event_named`] — the
/// record stays a pure state machine with no direct DB access.
///
/// Manually implements [`Record`] rather than using `#[derive(EpicsRecord)]`
/// so it can declare [`Record::fields_posted_with_monitor_mask`] — the derive
/// emits only the four mandatory methods (the same reason `longout` is hand
/// written).
pub struct EventRecord {
/// Event name to post. DBF_STRING in C (was a numeric subscript
/// pre-EPICS-7; a numeric string still works for back-compat).
pub val: String,
/// SIMM is `DBF_MENU menu(menuYesNo)` (eventRecord.dbd.pod:152-156):
/// the two-choice NO/YES simulation menu, served as DBR_ENUM.
pub simm: i16,
pub siml: String,
pub siol: String,
/// SVAL is `DBF_STRING` (eventRecord.dbd.pod:143-145) — the BUFFER C's
/// `readValue` reads SIOL into (`dbGetLink(&prec->siol, DBR_STRING,
/// &prec->sval)`, eventRecord.c:185) before publishing `val = sval`.
pub sval: PvString,
pub sims: i16,
/// SDLY — "Sim. Mode Async Delay" (`DBF_DOUBLE`, `initial("-1.0")`,
/// eventRecord.dbd.pod:171-177). A non-negative SDLY makes the simulated
/// SIOL read asynchronous: C's `readValue` arms
/// `callbackRequestProcessCallbackDelayed(..., prec->sdly)` and holds PACT
/// across the delay (eventRecord.c:184-201). The framework reads the delay
/// via `get_field("SDLY")`, so the field must exist for a `.db` to set it.
pub sdly: f64,
}
impl Default for EventRecord {
fn default() -> Self {
Self {
val: String::new(),
simm: 0,
siml: String::new(),
siol: String::new(),
sval: PvString::new(),
sims: 0,
// C `field(SDLY,DBF_DOUBLE) { initial("-1.0") }` — negative means
// "synchronous simulation".
sdly: -1.0,
}
}
}
impl EventRecord {
/// Construct an event record that posts event name `val`.
pub fn new(val: impl Into<String>) -> Self {
Self {
val: val.into(),
..Default::default()
}
}
}
fn put_string(slot: &mut String, value: EpicsValue, field: &str) -> CaResult<()> {
match value {
EpicsValue::String(v) => {
*slot = v.as_str_lossy().into_owned();
Ok(())
}
_ => Err(CaError::TypeMismatch(field.to_string())),
}
}
fn put_short(slot: &mut i16, value: EpicsValue, field: &str) -> CaResult<()> {
match value {
EpicsValue::Short(v) => {
*slot = v;
Ok(())
}
_ => Err(CaError::TypeMismatch(field.to_string())),
}
}
fn put_double(slot: &mut f64, value: EpicsValue, field: &str) -> CaResult<()> {
match value {
EpicsValue::Double(v) => {
*slot = v;
Ok(())
}
_ => Err(CaError::TypeMismatch(field.to_string())),
}
}
impl Record for EventRecord {
fn record_type(&self) -> &'static str {
"event"
}
/// C `eventRecord.c::process` never clears UDF: the record's one
/// `prec->udf = FALSE` is inside `readValue`'s simulated SIOL branch
/// (`:191`), which the framework's simulation tail already reproduces. A
/// plain event record therefore keeps the UDF it was loaded with — softIoc:
/// `record(event,"E2"){}` processes to UDF=1, while `field(VAL,"1")` in the
/// `.db` defines it at load (UDF=0).
fn clears_udf(&self) -> bool {
false
}
/// `eventRecord.c` has NO `checkAlarms` either — an event record with UDF=1
/// publishes NO_ALARM (softIoc: `record(event,"E2"){}` → UDF 1, SEVR
/// NO_ALARM, even with the default `UDFS = INVALID`).
fn raises_udf_alarm(&self) -> bool {
false
}
/// C `eventRecord.c::monitor` (157-165) is the whole of the record's
/// posting:
///
/// ```c
/// monitor_mask = recGblResetAlarms(prec);
/// db_post_events(prec,&prec->val,monitor_mask|DBE_VALUE);
/// ```
///
/// `monitor_mask` is `recGblResetAlarms`'s return — the alarm bits alone —
/// so VAL's post carries `DBE_VALUE` (plus `DBE_ALARM` on a cycle whose
/// alarm moved) and NEVER `DBE_LOG`. event has no MDEL/ADEL, and the post
/// is not guarded by `if (monitor_mask)`, so it fires on every process
/// whether or not the event name changed.
///
/// The port's generic path gave VAL the framework default
/// `DBE_VALUE | DBE_LOG`, so a `DBE_LOG`-only archiver was sent the event
/// name on every process — updates C sends it on no cycle at all. Naming
/// VAL here routes it through the LOG-stripping arm of
/// `RecordInstance::deadband_post`, the single owner of that mask.
fn fields_posted_with_monitor_mask(&self) -> &'static [&'static str] {
&["VAL"]
}
/// `SIMM` is `menu(menuYesNo)`, served as DBR_ENUM with the NO/YES labels.
fn menu_field_choices(&self, field: &str) -> Option<&'static [&'static str]> {
match field {
"SIMM" => Some(MENU_YES_NO),
_ => None,
}
}
fn get_field(&self, name: &str) -> Option<EpicsValue> {
match name {
"VAL" => Some(EpicsValue::String(self.val.clone().into())),
"SIMM" => Some(EpicsValue::Short(self.simm)),
"SIML" => Some(EpicsValue::String(self.siml.clone().into())),
"SIOL" => Some(EpicsValue::String(self.siol.clone().into())),
"SIMS" => Some(EpicsValue::Short(self.sims)),
"SDLY" => Some(EpicsValue::Double(self.sdly)),
_ => None,
}
}
/// Same per-variant strictness the derive emits: a put of the wrong
/// `EpicsValue` variant is a `TypeMismatch`, not a silent no-op.
fn put_field(&mut self, name: &str, value: EpicsValue) -> CaResult<()> {
self.validate_put(name, &value)?;
match name {
"VAL" => put_string(&mut self.val, value, name)?,
"SIML" => put_string(&mut self.siml, value, name)?,
"SIOL" => put_string(&mut self.siol, value, name)?,
"SIMM" => put_short(&mut self.simm, value, name)?,
"SIMS" => put_short(&mut self.sims, value, name)?,
"SDLY" => put_double(&mut self.sdly, value, name)?,
_ => return Err(CaError::FieldNotFound(name.to_string())),
}
self.on_put(name);
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::server::record::RecordInstance;
/// SIMM is `menu(menuYesNo)` served as DBR_ENUM. The base snapshot path
/// promotes the stored Short to `Enum` and attaches the NO/YES labels.
#[test]
fn simm_snapshot_is_enum_with_yesno_labels() {
let mut rec = EventRecord::default();
rec.put_field("SIMM", EpicsValue::Short(1)).unwrap();
assert_eq!(rec.menu_field_choices("SIMM"), Some(&["NO", "YES"][..]));
let inst = RecordInstance::new("EV:SIMM".into(), rec);
let snap = inst.snapshot_for_field("SIMM").unwrap();
assert_eq!(snap.value, EpicsValue::Enum(1));
assert_eq!(snap.enums.as_ref().unwrap().strings, vec!["NO", "YES"]);
}
}