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use lopdf;

#[derive(Default, Debug, Clone)]
pub struct OCGList {
    /// The reference to the layer as well as a reference to the
    /// OCG dictionary
    pub(crate) layers: Vec<(OCGRef, lopdf::Object)>,
}

impl OCGList {
    /// Creates a new OCG list
    pub fn new() -> Self {
        Self::default()
    }

    /// Adds a new OCG List from a reference
    pub fn add_ocg(&mut self, obj: lopdf::Object) -> OCGRef {
        let len = self.layers.len();
        let ocg_ref = OCGRef::new(len);
        self.layers.push((ocg_ref.clone(), obj));
        ocg_ref
    }
}

impl From<OCGList> for lopdf::Dictionary {
    fn from(val: OCGList) -> Self {
        let mut dict = lopdf::Dictionary::new();

        for entry in val.layers {
            dict.set(entry.0.name, entry.1);
        }

        dict
    }
}

#[derive(Debug, Clone)]
pub struct OCGRef {
    /// The referenced name of the layer
    pub(crate) name: String,
}

impl OCGRef {
    /// Creates a new OCG reference from an index
    pub fn new(index: usize) -> Self {
        Self {
            name: format!("MC{index}"),
        }
    }
}