use crate::*;

// -----------------------------------------------------------------------------

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_statement(s: Span) -> IResult<Span, CaseStatement> {
    alt((
        case_statement_normal,
        case_statement_matches,
        case_statement_inside,
    ))(s)
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_statement_normal(s: Span) -> IResult<Span, CaseStatement> {
    let (s, a) = opt(unique_priority)(s)?;
    let (s, b) = case_keyword(s)?;
    let (s, c) = paren(case_expression)(s)?;
    let (s, d) = case_item(s)?;
    let (s, (e, f)) = many_till(case_item, keyword("endcase"))(s)?;
    Ok((
        s,
        CaseStatement::Normal(Box::new(CaseStatementNormal {
            nodes: (a, b, c, d, e, f),
        })),
    ))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_statement_matches(s: Span) -> IResult<Span, CaseStatement> {
    let (s, a) = opt(unique_priority)(s)?;
    let (s, b) = case_keyword(s)?;
    let (s, c) = paren(case_expression)(s)?;
    let (s, d) = keyword("matches")(s)?;
    let (s, e) = case_pattern_item(s)?;
    let (s, (f, g)) = many_till(case_pattern_item, keyword("endcase"))(s)?;
    Ok((
        s,
        CaseStatement::Matches(Box::new(CaseStatementMatches {
            nodes: (a, b, c, d, e, f, g),
        })),
    ))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_statement_inside(s: Span) -> IResult<Span, CaseStatement> {
    let (s, a) = opt(unique_priority)(s)?;
    let (s, b) = keyword("case")(s)?;
    let (s, c) = paren(case_expression)(s)?;
    let (s, d) = keyword("inside")(s)?;
    let (s, e) = case_inside_item(s)?;
    let (s, (f, g)) = many_till(case_inside_item, keyword("endcase"))(s)?;
    Ok((
        s,
        CaseStatement::Inside(Box::new(CaseStatementInside {
            nodes: (a, b, c, d, e, f, g),
        })),
    ))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_keyword(s: Span) -> IResult<Span, CaseKeyword> {
    alt((
        map(keyword("casez"), |x| CaseKeyword::Casez(Box::new(x))),
        map(keyword("casex"), |x| CaseKeyword::Casex(Box::new(x))),
        map(keyword("case"), |x| CaseKeyword::Case(Box::new(x))),
    ))(s)
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_expression(s: Span) -> IResult<Span, CaseExpression> {
    let (s, a) = expression(s)?;
    Ok((s, CaseExpression { nodes: (a,) }))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_item(s: Span) -> IResult<Span, CaseItem> {
    alt((
        case_item_nondefault,
        map(case_item_default, |x| CaseItem::Default(Box::new(x))),
    ))(s)
}

#[recursive_parser]
#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_item_nondefault(s: Span) -> IResult<Span, CaseItem> {
    let (s, a) = list(symbol(","), case_item_expression)(s)?;
    let (s, b) = symbol(":")(s)?;
    let (s, c) = statement_or_null(s)?;
    Ok((
        s,
        CaseItem::NonDefault(Box::new(CaseItemNondefault { nodes: (a, b, c) })),
    ))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_item_default(s: Span) -> IResult<Span, CaseItemDefault> {
    let (s, a) = keyword("default")(s)?;
    let (s, b) = opt(symbol(":"))(s)?;
    let (s, c) = statement_or_null(s)?;
    Ok((s, CaseItemDefault { nodes: (a, b, c) }))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_pattern_item(s: Span) -> IResult<Span, CasePatternItem> {
    alt((
        case_pattern_item_nondefault,
        map(case_item_default, |x| CasePatternItem::Default(Box::new(x))),
    ))(s)
}

#[recursive_parser]
#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_pattern_item_nondefault(s: Span) -> IResult<Span, CasePatternItem> {
    let (s, a) = pattern(s)?;
    let (s, b) = opt(pair(symbol("&&&"), expression))(s)?;
    let (s, c) = symbol(":")(s)?;
    let (s, d) = statement_or_null(s)?;
    Ok((
        s,
        CasePatternItem::NonDefault(Box::new(CasePatternItemNondefault {
            nodes: (a, b, c, d),
        })),
    ))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_inside_item(s: Span) -> IResult<Span, CaseInsideItem> {
    alt((
        case_inside_item_nondefault,
        map(case_item_default, |x| CaseInsideItem::Default(Box::new(x))),
    ))(s)
}

#[recursive_parser]
#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_inside_item_nondefault(s: Span) -> IResult<Span, CaseInsideItem> {
    let (s, a) = open_range_list(s)?;
    let (s, b) = symbol(":")(s)?;
    let (s, c) = statement_or_null(s)?;
    Ok((
        s,
        CaseInsideItem::NonDefault(Box::new(CaseInsideItemNondefault { nodes: (a, b, c) })),
    ))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn case_item_expression(s: Span) -> IResult<Span, CaseItemExpression> {
    let (s, a) = expression(s)?;
    Ok((s, CaseItemExpression { nodes: (a,) }))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn randcase_statement(s: Span) -> IResult<Span, RandcaseStatement> {
    let (s, a) = keyword("randcase")(s)?;
    let (s, b) = randcase_item(s)?;
    let (s, (c, d)) = many_till(randcase_item, keyword("endcase"))(s)?;
    Ok((
        s,
        RandcaseStatement {
            nodes: (a, b, c, d),
        },
    ))
}

#[recursive_parser]
#[tracable_parser]
#[packrat_parser]
pub(crate) fn randcase_item(s: Span) -> IResult<Span, RandcaseItem> {
    let (s, a) = expression(s)?;
    let (s, b) = symbol(":")(s)?;
    let (s, c) = statement_or_null(s)?;
    Ok((s, RandcaseItem { nodes: (a, b, c) }))
}

#[recursive_parser]
#[tracable_parser]
#[packrat_parser]
pub(crate) fn open_range_list(s: Span) -> IResult<Span, OpenRangeList> {
    let (s, a) = list(symbol(","), open_value_range)(s)?;
    Ok((s, OpenRangeList { nodes: (a,) }))
}

#[tracable_parser]
#[packrat_parser]
pub(crate) fn open_value_range(s: Span) -> IResult<Span, OpenValueRange> {
    let (s, a) = value_range(s)?;
    Ok((s, OpenValueRange { nodes: (a,) }))
}