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use syn::parse_quote_spanned;

use super::{
    OperatorCategory, OperatorConstraints, WriteContextArgs, RANGE_0, RANGE_1,
};

/// > 0 input streams, 1 output stream
///
/// > Arguments: None.
///
/// Emits a single unit `()` at the start of the first tick.
///
/// ```dfir
/// initialize()
///     -> assert_eq([()]);
/// ```
pub const INITIALIZE: OperatorConstraints = OperatorConstraints {
    name: "initialize",
    categories: &[OperatorCategory::Source],
    hard_range_inn: RANGE_0,
    soft_range_inn: RANGE_0,
    hard_range_out: RANGE_1,
    soft_range_out: RANGE_1,
    num_args: 0,
    persistence_args: RANGE_0,
    type_args: RANGE_0,
    is_external_input: false,
    has_singleton_output: false,
    flo_type: None,
    ports_inn: None,
    ports_out: None,
    input_delaytype_fn: |_| None,
    write_fn: |wc @ &WriteContextArgs { op_span, .. }, diagnostics| {
        let wc = WriteContextArgs {
            arguments: &parse_quote_spanned!(op_span=> [()]),
            ..wc.clone()
        };
        (super::source_iter::SOURCE_ITER.write_fn)(&wc, diagnostics)
    },
};