use reifydb_core::value::column::{Column, columns::Columns, data::ColumnData};
use reifydb_type::value::{container::temporal::TemporalContainer, date::Date, r#type::Type};
use crate::function::{Function, FunctionCapability, FunctionContext, FunctionInfo, error::FunctionError};
pub struct DateStartOfYear {
info: FunctionInfo,
}
impl Default for DateStartOfYear {
fn default() -> Self {
Self::new()
}
}
impl DateStartOfYear {
pub fn new() -> Self {
Self {
info: FunctionInfo::new("date::start_of_year"),
}
}
}
impl Function for DateStartOfYear {
fn info(&self) -> &FunctionInfo {
&self.info
}
fn capabilities(&self) -> &[FunctionCapability] {
&[FunctionCapability::Scalar]
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::Date
}
fn execute(&self, ctx: &FunctionContext, args: &Columns) -> Result<Columns, FunctionError> {
if args.len() != 1 {
return Err(FunctionError::ArityMismatch {
function: ctx.fragment.clone(),
expected: 1,
actual: args.len(),
});
}
let column = &args[0];
let (data, bitvec) = column.data().unwrap_option();
let row_count = data.len();
let result_data = match data {
ColumnData::Date(container) => {
let mut result = TemporalContainer::with_capacity(row_count);
for i in 0..row_count {
if let Some(date) = container.get(i) {
match Date::new(date.year(), 1, 1) {
Some(d) => result.push(d),
None => result.push_default(),
}
} else {
result.push_default();
}
}
ColumnData::Date(result)
}
other => {
return Err(FunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::Date],
actual: other.get_type(),
});
}
};
let final_data = if let Some(bv) = bitvec {
ColumnData::Option {
inner: Box::new(result_data),
bitvec: bv.clone(),
}
} else {
result_data
};
Ok(Columns::new(vec![Column::new(ctx.fragment.clone(), final_data)]))
}
}