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use crate::nodes::InnerNode;
use crate::nodes::InspectVec;
use crate::Loc;
use crate::Node;

#[cfg(feature = "compile-with-external-structures")]
use crate::containers::ExternalMaybePtr;
#[cfg(feature = "compile-with-external-structures")]
type MaybePtr<T> = ExternalMaybePtr<T>;
#[cfg(not(feature = "compile-with-external-structures"))]
type MaybePtr<T> = Option<Box<T>>;


#[cfg(feature = "compile-with-external-structures")]
use crate::containers::ExternalPtr;
#[cfg(feature = "compile-with-external-structures")]
type Ptr<T> = ExternalPtr<T>;
#[cfg(not(feature = "compile-with-external-structures"))]
type Ptr<T> = Box<T>;


/// Represents a Ruby block that is passed to a method (`proc { |foo| bar }`)
///
#[derive(Debug, Clone, PartialEq)]
#[repr(C)]
pub struct Block {
    /// Method call that takes a block
    ///
    /// `Send("foo")` in `foo {}`
    ///
    pub call: Ptr<Node>,
    /// A list of argument that block takes
    ///
    /// `vec![ Arg("a"), Optarg("b", Int("1")) ]` for `proc { |a, b = 1| }`
    ///
    /// `None` if the block takes no arguments
    ///
    pub args: MaybePtr<Node>,
    /// Block body, `None` if block has no body.
    ///
    pub body: MaybePtr<Node>,
    /// Location of the open brace
    ///
    /// ```text
    /// proc { }
    ///      ~
    /// ```
    ///
    pub begin_l: Loc,
    /// Location of the closing brace
    ///
    /// ```text
    /// proc { }
    ///        ~
    /// ```
    ///
    pub end_l: Loc,
    /// Location of the full expression
    ///
    /// ```text
    /// proc { }
    /// ~~~~~~~~
    /// ```
    ///
    pub expression_l: Loc,
}

impl InnerNode for Block {
    fn expression(&self) -> &Loc {
        &self.expression_l
    }

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

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

    fn print_with_locs(&self) {
        println!("{}", self.inspect(0));
        self.call.inner_ref().print_with_locs();
        self.args.as_ref().map(|node| node.inner_ref().print_with_locs());
        self.body.as_ref().map(|node| node.inner_ref().print_with_locs());
        self.begin_l.print("begin");
        self.end_l.print("end");
        self.expression_l.print("expression");
    }
}