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use super::compact::Compact;
use super::compact_vec::CompactVec;

/// A compact storage for a `String`. So far doesn't support direct mutable operations,
/// Only conversion from and to `String`/`&str`
#[derive(Clone, Default)]
pub struct CompactString {
    chars: CompactVec<u8>,
}

impl CompactString {
    /// Create an empty `CString`
    pub fn new() -> Self {
        Default::default()
    }

    /// Appends a given string slice onto the end of this `CString`.
    pub fn push_str(&mut self, string: &str) {
        self.chars.extend_from_copy_slice(string.as_bytes());
    }
}

impl ::std::ops::Deref for CompactString {
    type Target = str;

    fn deref(&self) -> &str {
        unsafe { ::std::str::from_utf8_unchecked(&self.chars) }
    }
}

impl ::std::convert::From<String> for CompactString {
    fn from(string: String) -> CompactString {
        CompactString {
            chars: string.into_bytes().into(),
        }
    }
}

impl Compact for CompactString {
    fn is_still_compact(&self) -> bool {
        self.chars.is_still_compact()
    }

    fn dynamic_size_bytes(&self) -> usize {
        self.chars.dynamic_size_bytes()
    }

    unsafe fn compact(source: *mut Self, dest: *mut Self, new_dynamic_part: *mut u8) {
        Compact::compact(&mut (*source).chars, &mut (*dest).chars, new_dynamic_part)
    }

    unsafe fn decompact(source: *const Self) -> Self {
        CompactString {
            chars: Compact::decompact(&(*source).chars),
        }
    }
}