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use crate::nodes::InnerNode;
use crate::nodes::InspectVec;
use crate::source::Range;
use crate::Node;
/// Represents an `in pattern` branch of the pattern matching
#[derive(Debug, Clone, PartialEq)]
pub struct InPattern {
    /// Value that is used for matching
    pub pattern: Box<Node>,
    /// Guard that is used for matching
    ///
    /// Optional, so can be `None`
    pub guard: Option<Box<Node>>,
    /// Body of the branch that is invoked if value matches pattern
    pub body: Option<Box<Node>>,
    /// Location of the `in` keyword
    ///
    /// ```text
    /// case value; in pattern; end
    ///             ~~
    /// ```
    pub keyword_l: Range,
    /// Location of the `then` keyword
    ///
    /// ```text
    /// case value; in pattern then; end
    ///                        ~~~~
    /// ```
    pub begin_l: Range,
    /// Location of the full expression
    ///
    /// ```text
    /// case value; in pattern then; 42; end
    ///             ~~~~~~~~~~~~~~~~~~~
    /// ```
    pub expression_l: Range,
}


impl InnerNode for InPattern {
    fn expression(&self) -> &Range {
        &self.expression_l
    }

    fn inspected_children(&self, indent: usize) -> Vec<String> {
        let mut result = InspectVec::new(indent);
        result.push_node(&self.pattern);
        result.push_maybe_node_or_nil(&self.guard);
        result.push_maybe_node_or_nil(&self.body);
        result.strings()
    }

    fn str_type(&self) -> &'static str {
        "in_pattern"
    }

    fn print_with_locs(&self) {
        println!("{}", self.inspect(0));
        self.expression_l.print("expression");
        self.begin_l.print("begin");
        self.keyword_l.print("keyword");
        if let Some(node) = &self.body {
            node.inner_ref().print_with_locs();
        }
        if let Some(node) = &self.guard {
            node.inner_ref().print_with_locs();
        }
        self.pattern.inner_ref().print_with_locs();
    }
}