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pub use langtag::{InvalidLangTag, LangTag, LangTagBuf};
use std::{borrow::Borrow, fmt, hash::Hash, ops::Deref};

use crate::utils::{case_insensitive_cmp, case_insensitive_eq, case_insensitive_hash};

/// Language tag that may not be well-formed.
#[derive(Debug)]
pub struct LenientLangTag(str);

impl LenientLangTag {
	pub fn new(s: &str) -> (&Self, Option<InvalidLangTag<&str>>) {
		let err = LangTag::new(s).err();
		(unsafe { std::mem::transmute(s) }, err)
	}

	pub fn as_bytes(&self) -> &[u8] {
		self.0.as_bytes()
	}

	pub fn as_str(&self) -> &str {
		&self.0
	}

	pub fn is_well_formed(&self) -> bool {
		LangTag::new(self.as_str()).is_ok()
	}

	pub fn as_well_formed(&self) -> Option<&LangTag> {
		LangTag::new(self.as_str()).ok()
	}
}

impl PartialEq for LenientLangTag {
	fn eq(&self, other: &Self) -> bool {
		case_insensitive_eq(self.as_bytes(), other.as_bytes())
	}
}

impl Eq for LenientLangTag {}

impl PartialOrd for LenientLangTag {
	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
		Some(self.cmp(other))
	}
}

impl Ord for LenientLangTag {
	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
		case_insensitive_cmp(self.as_bytes(), other.as_bytes())
	}
}

impl Hash for LenientLangTag {
	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
		case_insensitive_hash(self.as_bytes(), state)
	}
}

impl ToOwned for LenientLangTag {
	type Owned = LenientLangTagBuf;

	fn to_owned(&self) -> Self::Owned {
		LenientLangTagBuf(self.0.to_owned())
	}
}

impl Borrow<str> for LenientLangTag {
	fn borrow(&self) -> &str {
		self.as_str()
	}
}

impl AsRef<str> for LenientLangTag {
	fn as_ref(&self) -> &str {
		self.as_str()
	}
}

impl fmt::Display for LenientLangTag {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		self.0.fmt(f)
	}
}

/// Owned language tag that may not be well-formed.
#[derive(Debug, Clone)]
pub struct LenientLangTagBuf(String);

impl LenientLangTagBuf {
	pub fn new(s: String) -> (Self, Option<InvalidLangTag<String>>) {
		let err = LangTag::new(s.as_str())
			.err()
			.map(|InvalidLangTag(s)| InvalidLangTag(s.to_owned()));
		(Self(s), err)
	}

	pub fn as_lenient_lang_tag_ref(&self) -> &LenientLangTag {
		unsafe { std::mem::transmute(self.0.as_str()) }
	}

	pub fn into_string(self) -> String {
		self.0
	}

	pub fn into_well_formed(self) -> Result<LangTagBuf, InvalidLangTag<String>> {
		LangTagBuf::new(self.0)
	}
}

impl Deref for LenientLangTagBuf {
	type Target = LenientLangTag;

	fn deref(&self) -> &Self::Target {
		self.as_lenient_lang_tag_ref()
	}
}

impl PartialEq for LenientLangTagBuf {
	fn eq(&self, other: &Self) -> bool {
		self.as_lenient_lang_tag_ref()
			.eq(other.as_lenient_lang_tag_ref())
	}
}

impl Eq for LenientLangTagBuf {}

impl PartialOrd for LenientLangTagBuf {
	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
		Some(self.cmp(other))
	}
}

impl Ord for LenientLangTagBuf {
	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
		self.as_lenient_lang_tag_ref()
			.cmp(other.as_lenient_lang_tag_ref())
	}
}

impl Hash for LenientLangTagBuf {
	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
		self.as_lenient_lang_tag_ref().hash(state)
	}
}

impl Borrow<LenientLangTag> for LenientLangTagBuf {
	fn borrow(&self) -> &LenientLangTag {
		self.as_lenient_lang_tag_ref()
	}
}

impl AsRef<LenientLangTag> for LenientLangTagBuf {
	fn as_ref(&self) -> &LenientLangTag {
		self.as_lenient_lang_tag_ref()
	}
}

impl From<LangTagBuf> for LenientLangTagBuf {
	fn from(tag: LangTagBuf) -> Self {
		Self(tag.into_string())
	}
}

impl From<String> for LenientLangTagBuf {
	fn from(tag: String) -> Self {
		Self(tag)
	}
}

impl fmt::Display for LenientLangTagBuf {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		self.0.fmt(f)
	}
}

#[cfg(feature = "serde")]
impl serde::Serialize for LenientLangTagBuf {
	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
	where
		S: serde::Serializer,
	{
		self.as_str().serialize(serializer)
	}
}

#[cfg(feature = "serde")]
impl<'de> serde::Deserialize<'de> for LenientLangTagBuf {
	fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
	where
		D: serde::Deserializer<'de>,
	{
		Ok(Self(String::deserialize(deserializer)?))
	}
}