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use crate::Span;

use super::Rule;

#[derive(Clone)]
pub struct StmtExpr<'i> {
    pub stmt: Stmt<'i>,
    pub rule: Rule<'i>,
    pub span: Span,
}

#[derive(Clone)]
pub enum Stmt<'i> {
    Enable(BooleanSetting),
    Disable(BooleanSetting),
    Let(Let<'i>),
}

#[derive(Clone, PartialEq, Eq)]
pub enum BooleanSetting {
    Lazy,
}

#[derive(Clone)]
pub struct Let<'i> {
    pub name: &'i str,
    pub rule: Rule<'i>,
    pub name_span: Span,
}

impl<'i> Let<'i> {
    pub fn new(name: &'i str, rule: Rule<'i>, name_span: Span) -> Self {
        Self { name, rule, name_span }
    }

    pub fn name(&self) -> &'i str {
        self.name
    }
}

impl<'i> StmtExpr<'i> {
    pub fn new(stmt: Stmt<'i>, rule: Rule<'i>, span: Span) -> Self {
        Self { stmt, rule, span }
    }

    #[cfg(feature = "dbg")]
    pub(super) fn pretty_print(&self, buf: &mut crate::PrettyPrinter) {
        match &self.stmt {
            Stmt::Enable(BooleanSetting::Lazy) => buf.write("enable lazy;\n"),
            Stmt::Disable(BooleanSetting::Lazy) => buf.write("disable lazy;\n"),
            Stmt::Let(r#let) => {
                buf.push_str("let ");
                buf.write(r#let.name);
                buf.push_str(" = ");
                r#let.rule.pretty_print(buf, true);
                buf.write(";\n");
                self.rule.pretty_print(buf, false);
            }
        }
    }
}