use reifydb_core::value::column::{ColumnWithName, buffer::ColumnBuffer, columns::Columns};
use reifydb_type::value::r#type::Type;
use crate::routine::{Function, FunctionKind, Routine, RoutineInfo, context::FunctionContext, error::RoutineError};
pub struct DateDayOfWeek {
info: RoutineInfo,
}
impl Default for DateDayOfWeek {
fn default() -> Self {
Self::new()
}
}
impl DateDayOfWeek {
pub fn new() -> Self {
Self {
info: RoutineInfo::new("date::day_of_week"),
}
}
}
impl<'a> Routine<FunctionContext<'a>> for DateDayOfWeek {
fn info(&self) -> &RoutineInfo {
&self.info
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::Int4
}
fn execute(&self, ctx: &mut FunctionContext<'a>, args: &Columns) -> Result<Columns, RoutineError> {
if args.len() != 1 {
return Err(RoutineError::FunctionArityMismatch {
function: ctx.fragment.clone(),
expected: 1,
actual: args.len(),
});
}
let column = &args[0];
let (data, bitvec) = column.unwrap_option();
let row_count = data.len();
let result_data = match data {
ColumnBuffer::Date(container) => {
let mut result = Vec::with_capacity(row_count);
let mut res_bitvec = Vec::with_capacity(row_count);
for i in 0..row_count {
if let Some(date) = container.get(i) {
let days = date.to_days_since_epoch();
let dow = ((days % 7 + 3) % 7 + 7) % 7 + 1;
result.push(dow);
res_bitvec.push(true);
} else {
result.push(0);
res_bitvec.push(false);
}
}
ColumnBuffer::int4_with_bitvec(result, res_bitvec)
}
other => {
return Err(RoutineError::FunctionInvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::Date],
actual: other.get_type(),
});
}
};
let final_data = if let Some(bv) = bitvec {
ColumnBuffer::Option {
inner: Box::new(result_data),
bitvec: bv.clone(),
}
} else {
result_data
};
Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
}
}
impl Function for DateDayOfWeek {
fn kinds(&self) -> &[FunctionKind] {
&[FunctionKind::Scalar]
}
}