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use crate::nodes::InnerNode;
use crate::nodes::InspectVec;
use crate::source::Range;
use crate::Node;
/// Represents an `if` statement (i.e. `if foo; bar; else; baz; end`)
#[derive(Debug, Clone, PartialEq)]
pub struct If {
    /// Condition given to the `if` statement, `Lvar("a")` for `if a; b; else; c; end`
    pub cond: Box<Node>,
    /// True-branch of the `if` statement, `Lvar("b")` for `if a; b; else; c; end`
    pub if_true: Option<Box<Node>>,
    /// False-branch of the `if` statement, `Lvar("c")` for `if a; b; else; c; end`
    pub if_false: Option<Box<Node>>,
    /// Location of the `if` keyword
    ///
    /// ```text
    /// if foo; end
    /// ~~
    /// ```
    pub keyword_l: Range,
    /// Location of the `then` keyword
    ///
    /// ```text
    /// if foo then; end
    ///        ~~~~
    /// ```
    ///
    /// `None` if `then` keyword is omitted
    pub begin_l: Range,
    /// Location of the `else` keyword
    ///
    /// ```text
    /// if foo; else; end
    ///         ~~~~
    /// ```
    ///
    /// `None` if there's no `else` branch
    pub else_l: Option<Range>,
    /// Location of the `end` keyword
    ///
    /// ```text
    /// if foo; end
    ///         ~~~
    /// ```
    pub end_l: Option<Range>,
    /// Location of the full expression
    ///
    /// ```text
    /// if a then; b; else; c end
    /// ~~~~~~~~~~~~~~~~~~~~~~~~~
    /// ```
    pub expression_l: Range,
}


impl InnerNode for If {
    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.cond);
        result.push_maybe_node_or_nil(&self.if_true);
        result.push_maybe_node_or_nil(&self.if_false);
        result.strings()
    }

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

    fn print_with_locs(&self) {
        println!("{}", self.inspect(0));
        self.expression_l.print("expression");
        if let Some(range) = &self.end_l {
            range.print("end");
        }
        if let Some(range) = &self.else_l {
            range.print("else");
        }
        self.begin_l.print("begin");
        self.keyword_l.print("keyword");
        if let Some(node) = &self.if_false {
            node.inner().print_with_locs();
        }
        if let Some(node) = &self.if_true {
            node.inner().print_with_locs();
        }
        self.cond.inner().print_with_locs();
    }
}