use liwe::model::node::NodeIter;
use liwe::operations::Changes;

use super::{Action, ActionContext, ActionProvider};

pub struct SortAction {
    pub title: String,
    pub identifier: String,
    pub reverse: bool,
}

impl ActionProvider for SortAction {
    fn identifier(&self) -> String {
        format!("custom.{}", self.identifier)
    }

    fn action(
        &self,
        key: super::Key,
        selection: super::TextRange,
        context: impl ActionContext,
    ) -> Option<Action> {
        let target_id = context.get_node_id_at(&key, selection.start.line as usize)?;
        context
            .collect(&key)
            .get_surrounding_list_id(target_id)
            .filter(|scope_id| {
                !context.collect(&key).is_sorted(*scope_id, self.reverse)
            })
            .map(|_| Action {
                title: self.title.clone(),
                identifier: self.identifier(),
                key: key.clone(),
                range: selection.clone(),
            })
    }

    fn changes(
        &self,
        key: super::Key,
        selection: super::TextRange,
        context: impl ActionContext,
    ) -> Option<Changes> {
        let target_id = context.get_node_id_at(&key, selection.start.line as usize)?;

        context
            .collect(&key)
            .get_surrounding_list_id(target_id)
            .map(|scope_id| {
                Changes::new().update(
                    key.clone(),
                    context
                        .collect(&key)
                        .sort_children(scope_id, self.reverse)
                        .iter()
                        .to_markdown(&key.parent(), context.markdown_options()),
                )
            })
    }
}
