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use super::Join;
use crate::{
    error::ToqlError, key::Key, keyed::Keyed, query::field_path::FieldPath, sql_expr::SqlExpr,
    table_mapper::mapped::Mapped, tree::tree_insert::TreeInsert,
};
use std::collections::HashSet;

impl<T> TreeInsert for Join<T>
where
    T: Keyed + TreeInsert + Mapped,
    <T as Keyed>::Key: Key + Clone,
{
    fn columns<'a, I>(descendents: I) -> Result<SqlExpr, ToqlError>
    where
        I: Iterator<Item = FieldPath<'a>>,
    {
        <T as TreeInsert>::columns(descendents)
    }
    fn values<'a, 'b, I, J>(
        &self,
        descendents: I,
        roles: &HashSet<String>,
        should_insert: &mut J,
        values: &mut SqlExpr,
    ) -> Result<(), ToqlError>
    where
        I: Iterator<Item = FieldPath<'a>> + Clone,
        J: Iterator<Item = &'b bool>,
    {
        match self {
            Join::Key(_) => Ok(()),
            Join::Entity(e) => e.values(descendents, roles, should_insert, values),
        }
    }
}