// Admitted candidate `model_0` (claude-code:default, 104/104); provenance: relpos.provenance.json
use crate::relpos::{RelposInputs, RelposOutputs};
use dom::computed::LengthPercentageOrAuto;

fn length_of(value: LengthPercentageOrAuto) -> Option<f64> {
    match value {
        LengthPercentageOrAuto::Length(v) => Some(v),
        LengthPercentageOrAuto::Auto => None,
        LengthPercentageOrAuto::Percentage(_) => None,
        LengthPercentageOrAuto::Unresolved => None,
    }
}

pub fn resolve(inputs: &RelposInputs) -> RelposOutputs {
    let left = length_of(inputs.left);
    let right = length_of(inputs.right);
    let top = length_of(inputs.top);
    let bottom = length_of(inputs.bottom);

    let rtl = matches!(inputs.direction, crate::width::Direction::Rtl);

    let shift_x = match (left, right) {
        (None, None) => 0.0,
        (Some(l), None) => l,
        (None, Some(r)) => -r,
        (Some(l), Some(r)) => {
            if rtl {
                -r
            } else {
                l
            }
        }
    };

    let shift_y = match (top, bottom) {
        (None, None) => 0.0,
        (Some(t), _) => t,
        (None, Some(b)) => -b,
    };

    RelposOutputs { shift_x, shift_y }
}