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use std::fmt::{Debug, Display};

use super::{PropertyType, ToSgf};
use crate::InvalidNodeError;

/// A type that can be used for properties in an [`SgfNode`](`crate::SgfNode`).
///
/// This trait is sealed and cannot be implemented for types outside of `sgf_parse`.
pub trait SgfProp: Debug + Display + Sized + Clone + Eq + private::Sealed {
    type Point: Debug + Clone + PartialEq + Eq + std::hash::Hash + ToSgf;
    type Stone: Debug + Clone + PartialEq + Eq + std::hash::Hash + ToSgf;
    type Move: Debug + Clone + PartialEq + Eq + ToSgf;

    /// Returns a new property parsed from the provided identifier and values
    ///
    /// # Examples
    /// ```
    /// use sgf_parse::SgfProp;
    /// use sgf_parse::go::Prop;
    ///
    /// // Prop::B(Point{ x: 2, y: 3 }
    /// let prop = Prop::new("B".to_string(), vec!["cd".to_string()]);
    /// // Prop::AB(vec![Point{ x: 2, y: 3 }, Point { x: 3, y: 3 }])
    /// let prop = Prop::new("AB".to_string(), vec!["cd".to_string(), "dd".to_string()]);
    /// // Prop::Unknown("FOO", vec!["Text"])
    /// let prop = Prop::new("FOO".to_string(), vec!["Text".to_string()]);
    /// ```
    fn new(identifier: String, values: Vec<String>) -> Self;

    /// Returns a the identifier associated with the [`SgfProp`].
    ///
    /// # Examples
    /// ```
    /// use sgf_parse::SgfProp;
    /// use sgf_parse::go::Prop;
    ///
    /// let prop = Prop::new("W".to_string(), vec!["de".to_string()]);
    /// assert_eq!(prop.identifier(), "W");
    /// let prop = Prop::new("FOO".to_string(), vec!["de".to_string()]);
    /// assert_eq!(prop.identifier(), "FOO");
    /// ```
    fn identifier(&self) -> String;

    /// Returns the [`PropertyType`] associated with the property.
    ///
    /// # Examples
    /// ```
    /// use sgf_parse::{PropertyType, SgfProp};
    /// use sgf_parse::go::Prop;
    ///
    /// let prop = Prop::new("W".to_string(), vec!["de".to_string()]);
    /// assert_eq!(prop.property_type(), Some(PropertyType::Move));
    /// let prop = Prop::new("FOO".to_string(), vec!["de".to_string()]);
    /// assert_eq!(prop.property_type(), None);
    /// ```
    fn property_type(&self) -> Option<PropertyType>;

    /// Validates a set of properties.
    ///
    /// # Errors
    /// Returns an error if the collection of properties isn't valid.
    fn validate_properties(properties: &[Self], is_root: bool) -> Result<(), InvalidNodeError>;
}

// Prevent users from implementing the SgfProp trait.
// Because `parse` has to return an enum, with the current design, implementing
// a new game outside the crate is a mess.
//
// If you'd like to implement this trait for a new game, PR's are very welcome!
mod private {
    pub trait Sealed {}
    impl Sealed for crate::go::Prop {}
    impl Sealed for crate::unknown_game::Prop {}
    impl<'a, T> Sealed for &'a T where T: ?Sized + Sealed {}
}