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//! `FEEL` qualified names.

use crate::Name;
use std::fmt;
use std::ops::Deref;

/// FEEL `QualifiedName`.
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct QualifiedName(Vec<Name>);

impl QualifiedName {
  /// Creates a [QualifiedName] from [Names](Name).
  pub fn new(names: &[&Name]) -> Self {
    Self(names.iter().map(|&v| v.clone()).collect::<Vec<Name>>())
  }
}

impl fmt::Display for QualifiedName {
  /// Implements [Display](fmt::Display) trait for [QualifiedName].
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "{}", self.0.iter().map(|v| v.to_string()).collect::<Vec<String>>().join("."))
  }
}

impl Deref for QualifiedName {
  type Target = Vec<Name>;
  fn deref(&self) -> &Self::Target {
    &self.0
  }
}

impl QualifiedName {
  /// Appends this [QualifiedName] with a given [Name].
  pub fn push(&mut self, name: Name) {
    self.0.push(name);
  }

  /// Inserts a given [Name] at specified position in [QualifiedName].
  pub fn insert(&mut self, index: usize, name: Name) {
    self.0.insert(index, name);
  }

  /// Returns last [Name] from [QualifiedName].
  pub fn pop(&mut self) -> Option<Name> {
    self.0.pop()
  }
}

impl From<Name> for QualifiedName {
  /// Converts a name into qualified name.
  fn from(value: Name) -> Self {
    Self(value.to_string().split('.').map(Name::from).collect())
  }
}

impl From<Vec<Name>> for QualifiedName {
  /// Converts a vector of names into qualified name.
  fn from(value: Vec<Name>) -> Self {
    let mut names = vec![];
    for name in value {
      let mut sub_names = name.to_string().split('.').map(Name::from).collect::<Vec<Name>>();
      names.append(&mut sub_names);
    }
    Self(names)
  }
}