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//! Object node.

use super::Node;
use gc::{Finalize, Trace};
use std::fmt;

use crate::syntax::ast::node::PropertyDefinition;

#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};

/// Objects in JavaScript may be defined as an unordered collection of related data, of
/// primitive or reference types, in the form of “key: value” pairs.
///
/// Objects can be initialized using `new Object()`, `Object.create()`, or using the literal
/// notation.
///
/// An object initializer is an expression that describes the initialization of an
/// [`Object`][object]. Objects consist of properties, which are used to describe an object.
/// Values of object properties can either contain [`primitive`][primitive] data types or other
/// objects.
///
/// More information:
///  - [ECMAScript reference][spec]
///  - [MDN documentation][mdn]
///
/// [spec]: https://tc39.es/ecma262/#prod-ObjectLiteral
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer
/// [object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object
/// [primitive]: https://developer.mozilla.org/en-US/docs/Glossary/primitive
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "serde", serde(transparent))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct Object {
    properties: Box<[PropertyDefinition]>,
}

impl Object {
    pub fn properties(&self) -> &[PropertyDefinition] {
        &self.properties
    }

    /// Implements the display formatting with indentation.
    pub(super) fn display(&self, f: &mut fmt::Formatter<'_>, indent: usize) -> fmt::Result {
        f.write_str("{\n")?;
        for property in self.properties().iter() {
            match property {
                PropertyDefinition::IdentifierReference(key) => {
                    write!(f, "{}    {},", indent, key)?;
                }
                PropertyDefinition::Property(key, value) => {
                    write!(f, "{}    {}: {},", indent, key, value)?;
                }
                PropertyDefinition::SpreadObject(key) => {
                    write!(f, "{}    ...{},", indent, key)?;
                }
                PropertyDefinition::MethodDefinition(_kind, _key, _node) => {
                    // TODO: Implement display for PropertyDefinition::MethodDefinition.
                    unimplemented!("Display for PropertyDefinition::MethodDefinition");
                }
            }
        }
        f.write_str("}")
    }
}

impl fmt::Display for Object {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.display(f, 0)
    }
}

impl<T> From<T> for Object
where
    T: Into<Box<[PropertyDefinition]>>,
{
    fn from(props: T) -> Self {
        Self {
            properties: props.into(),
        }
    }
}

impl From<Object> for Node {
    fn from(obj: Object) -> Self {
        Self::Object(obj)
    }
}