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mod components;

use std::fmt;
use std::hash::Hasher;

pub use components::*;

use crate::{private, Encoding, Utf8Encoding, Utf8Path, Utf8PathBuf, WindowsEncoding};

/// Represents a Windows-specific [`Utf8Path`]
pub type Utf8WindowsPath = Utf8Path<Utf8WindowsEncoding>;

/// Represents a Windows-specific [`Utf8PathBuf`]
pub type Utf8WindowsPathBuf = Utf8PathBuf<Utf8WindowsEncoding>;

/// Represents a Windows-specific [`Utf8Encoding`]
pub struct Utf8WindowsEncoding;

impl private::Sealed for Utf8WindowsEncoding {}

impl<'a> Utf8Encoding<'a> for Utf8WindowsEncoding {
    type Components = Utf8WindowsComponents<'a>;

    fn label() -> &'static str {
        "windows"
    }

    fn components(path: &'a str) -> Self::Components {
        Utf8WindowsComponents::new(path)
    }

    fn hash<H: Hasher>(path: &str, h: &mut H) {
        WindowsEncoding::hash(path.as_bytes(), h);
    }

    fn push(current_path: &mut String, path: &str) {
        unsafe {
            WindowsEncoding::push(current_path.as_mut_vec(), path.as_bytes());
        }
    }
}

impl fmt::Debug for Utf8WindowsEncoding {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Utf8WindowsEncoding").finish()
    }
}

impl fmt::Display for Utf8WindowsEncoding {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Utf8WindowsEncoding")
    }
}

impl<T> Utf8Path<T>
where
    T: for<'enc> Utf8Encoding<'enc>,
{
    /// Returns true if the encoding for the path is for Windows.
    ///
    /// # Examples
    ///
    /// ```
    /// use typed_path::{Utf8UnixPath, Utf8WindowsPath};
    ///
    /// assert!(!Utf8UnixPath::new("/some/path").has_windows_encoding());
    /// assert!(Utf8WindowsPath::new(r"\some\path").has_windows_encoding());
    /// ```
    pub fn has_windows_encoding(&self) -> bool {
        T::label() == Utf8WindowsEncoding::label()
    }

    /// Creates an owned [`Utf8PathBuf`] like `self` but using [`Utf8WindowsEncoding`].
    ///
    /// See [`Utf8Path::with_encoding`] for more information.
    pub fn with_windows_encoding(&self) -> Utf8PathBuf<Utf8WindowsEncoding> {
        self.with_encoding()
    }
}