#![allow(clippy::must_use_candidate)]
#![allow(clippy::too_many_lines)]
#![allow(clippy::module_name_repetitions)]
#![allow(clippy::cast_precision_loss)]
#![allow(clippy::cast_sign_loss)]
#![allow(clippy::cast_possible_truncation)]
#![allow(clippy::cast_possible_wrap)]
#![allow(clippy::similar_names)]
#![allow(clippy::shadow_unrelated)]
#![allow(clippy::missing_errors_doc)]
#![allow(clippy::used_underscore_binding)]

#[cfg(feature = "diesel_types")]
#[macro_use]
extern crate diesel;

use derive_more::{Deref, DerefMut, Display, From, Index, IndexMut, Into};
use serde::{Deserialize, Serialize};
use smartstring::alias::String as SmartString;
use std::convert::Infallible;
use std::{
    borrow::{Borrow, Cow},
    iter::FromIterator,
    path::Path,
    str::FromStr,
    string::FromUtf8Error,
};
use hyper::Body;

#[cfg(feature = "diesel_types")]
use diesel::{
    backend::Backend,
    deserialize::{FromSql as DeFromSql, Result as DeResult},
    serialize::{Output, Result as SerResult, ToSql as DeToSql},
    sql_types::Text,
};

#[cfg(feature = "diesel_types")]
use std::io::Write;

#[cfg(feature = "postgres_types")]
use bytes::BytesMut;
#[cfg(feature = "postgres_types")]
use postgres_types::{FromSql, IsNull, ToSql, Type};

#[cfg(feature = "rweb-openapi")]
use rweb::openapi::{Entity, Schema};

#[derive(
    Display,
    Serialize,
    Deserialize,
    Deref,
    DerefMut,
    Index,
    IndexMut,
    Debug,
    Clone,
    Into,
    From,
    PartialEq,
    Eq,
    Hash,
    Default,
    PartialOrd,
    Ord,
)]
#[cfg_attr(feature = "diesel_types", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "diesel_types", sql_type = "Text")]
pub struct StackString(SmartString);

impl StackString {
    pub fn new() -> Self {
        Self(SmartString::new())
    }

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

    pub fn split_off(&mut self, index: usize) -> Self {
        Self(self.0.split_off(index))
    }

    pub fn from_utf8(vec: Vec<u8>) -> Result<Self, FromUtf8Error> {
        String::from_utf8(vec).map(Into::into)
    }
}

impl From<StackString> for String {
    fn from(item: StackString) -> Self {
        item.0.into()
    }
}

impl From<String> for StackString {
    fn from(item: String) -> Self {
        Self(item.into())
    }
}

impl From<&String> for StackString {
    fn from(item: &String) -> Self {
        Self(item.into())
    }
}

impl From<&str> for StackString {
    fn from(item: &str) -> Self {
        Self(item.into())
    }
}

impl<'a> From<&'a StackString> for &'a str {
    fn from(item: &StackString) -> &str {
        item.as_str()
    }
}

impl Borrow<str> for StackString {
    fn borrow(&self) -> &str {
        self.0.borrow()
    }
}

impl AsRef<str> for StackString {
    fn as_ref(&self) -> &str {
        self.0.as_str()
    }
}

impl AsRef<[u8]> for StackString {
    fn as_ref(&self) -> &[u8] {
        self.0.as_ref()
    }
}

impl AsRef<Path> for StackString {
    fn as_ref(&self) -> &Path {
        Path::new(self.0.as_str())
    }
}

impl FromStr for StackString {
    type Err = Infallible;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(s.into())
    }
}

impl<'a> PartialEq<Cow<'a, str>> for StackString {
    #[inline]
    fn eq(&self, other: &Cow<'a, str>) -> bool {
        PartialEq::eq(&self[..], &other[..])
    }
}

impl<'a> PartialEq<String> for StackString {
    #[inline]
    fn eq(&self, other: &String) -> bool {
        PartialEq::eq(&self[..], &other[..])
    }
}

impl<'a> PartialEq<str> for StackString {
    #[inline]
    fn eq(&self, other: &str) -> bool {
        PartialEq::eq(&self[..], &other[..])
    }
}

impl<'a> PartialEq<&'a str> for StackString {
    #[inline]
    fn eq(&self, other: &&'a str) -> bool {
        PartialEq::eq(&self[..], &other[..])
    }
}

impl FromIterator<char> for StackString {
    fn from_iter<I: IntoIterator<Item = char>>(iter: I) -> Self {
        let mut buf = Self::new();
        buf.0.extend(iter);
        buf
    }
}

#[cfg(feature = "postgres_types")]
impl<'a> FromSql<'a> for StackString {
    fn from_sql(
        ty: &Type,
        raw: &'a [u8],
    ) -> Result<Self, Box<dyn std::error::Error + 'static + Send + Sync>> {
        let s = <&'a str as FromSql>::from_sql(ty, raw)?;
        Ok(s.into())
    }

    fn accepts(ty: &Type) -> bool {
        <&'a str as FromSql>::accepts(ty)
    }
}

#[cfg(feature = "postgres_types")]
impl ToSql for StackString {
    fn to_sql(
        &self,
        ty: &Type,
        out: &mut BytesMut,
    ) -> Result<IsNull, Box<dyn std::error::Error + Sync + Send>>
    where
        Self: Sized,
    {
        ToSql::to_sql(&self.as_str(), ty, out)
    }

    fn accepts(ty: &Type) -> bool
    where
        Self: Sized,
    {
        <String as ToSql>::accepts(ty)
    }

    fn to_sql_checked(
        &self,
        ty: &Type,
        out: &mut BytesMut,
    ) -> Result<IsNull, Box<dyn std::error::Error + Sync + Send>> {
        self.as_str().to_sql_checked(ty, out)
    }
}

#[cfg(feature = "diesel_types")]
impl<ST, DB> DeFromSql<ST, DB> for StackString
where
    DB: Backend,
    *const str: DeFromSql<ST, DB>,
{
    fn from_sql(bytes: Option<&DB::RawValue>) -> DeResult<Self> {
        let str_ptr = <*const str as DeFromSql<ST, DB>>::from_sql(bytes)?;
        let s = unsafe { &*str_ptr };
        Ok(s.into())
    }
}

#[cfg(feature = "diesel_types")]
impl<DB> DeToSql<Text, DB> for StackString
where
    DB: Backend,
    str: DeToSql<Text, DB>,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> SerResult {
        self.as_str().to_sql(out)
    }
}

#[cfg(feature = "rweb-openapi")]
impl Entity for StackString {
    #[inline]
    fn describe() -> Schema {
        str::describe()
    }
}

impl From<StackString> for Body {
    #[inline]
    fn from(s: StackString) -> Body {
        let s: String = s.into();
        Body::from(s)
    }
}

#[cfg(test)]
mod tests {
    use rand::{thread_rng, Rng};

    use crate::StackString;

    #[test]
    fn test_default() {
        assert_eq!(StackString::new(), StackString::default());
    }

    #[test]
    fn test_split_off() {
        let mut s0 = "hello there".to_string();
        let s1 = s0.split_off(3);
        let mut s2: StackString = "hello there".into();
        let s3 = s2.split_off(3);
        assert_eq!(s0.as_str(), s2.as_str());
        assert_eq!(s1.as_str(), s3.as_str());
    }

    #[test]
    fn test_from_utf8() {
        let mut rng = thread_rng();
        let v: Vec<_> = (0..20).map(|_| rng.gen::<u8>() & 0x7f).collect();
        let s0 = String::from_utf8(v.clone()).unwrap();
        let s1 = StackString::from_utf8(v).unwrap();
        assert_eq!(s0.as_str(), s1.as_str());

        let v: Vec<_> = (0..20).map(|_| rng.gen::<u8>()).collect();
        let s0 = String::from_utf8(v.clone());
        let s1 = StackString::from_utf8(v);

        match s0 {
            Ok(s) => assert_eq!(s.as_str(), s1.unwrap().as_str()),
            Err(e) => assert_eq!(e, s1.unwrap_err()),
        }
    }

    #[test]
    fn test_string_from_stackstring() {
        let s0 = StackString::from("Hello there");
        let s1: String = s0.clone().into();
        assert_eq!(s0.as_str(), s1.as_str());
    }

    #[test]
    fn test_stackstring_from_string() {
        let s0 = String::from("Hello there");
        let s1: StackString = s0.clone().into();
        assert_eq!(s0.as_str(), s1.as_str());
        let s1: StackString = (&s0).into();
        assert_eq!(s0.as_str(), s1.as_str());
    }

    #[test]
    fn test_borrow() {
        use std::borrow::Borrow;
        let s = StackString::from("Hello");
        let st: &str = s.borrow();
        assert_eq!(st, "Hello");
    }

    #[test]
    fn test_as_ref() {
        use std::path::Path;

        let s = StackString::from("Hello");
        let st: &str = s.as_ref();
        assert_eq!(st, s.as_str());
        let bt: &[u8] = s.as_ref();
        assert_eq!(bt, s.as_bytes());
        let pt: &Path = s.as_ref();
        assert_eq!(pt, Path::new("Hello"));
    }

    #[test]
    fn test_from_str() {
        let s = StackString::from("Hello");
        let st: StackString = "Hello".parse().unwrap();
        assert_eq!(s, st);
    }

    #[test]
    fn test_partialeq_cow() {
        use std::path::Path;
        let p = Path::new("Hello");
        let ps = p.to_string_lossy();
        let s = StackString::from("Hello");
        assert_eq!(s, ps);
    }

    #[test]
    fn test_partial_eq_string() {
        assert_eq!(StackString::from("Hello"), String::from("Hello"));
        assert_eq!(StackString::from("Hello"), "Hello");
        assert_eq!(&StackString::from("Hello"), "Hello");
    }

    #[test]
    fn test_from_iterator_char() {
        let mut rng = thread_rng();
        let v: Vec<char> = (0..20).map(|_| rng.gen::<char>()).collect();
        let s0: StackString = v.iter().map(|x| *x).collect();
        let s1: String = v.iter().map(|x| *x).collect();
        assert_eq!(s0, s1);
    }

    #[test]
    fn test_contains_stackstring() {
        let a: StackString = "hey there".into();
        let b: StackString = "hey".into();
        assert!(a.contains(b.as_str()));
    }

    #[test]
    fn test_contains_char() {
        let a: StackString = "hey there".into();
        assert!(a.contains(' '));
    }

    #[test]
    fn test_equality() {
        let s: StackString = "hey".into();
        assert_eq!(Some(&s).map(Into::into), Some("hey"));
    }

    #[cfg(feature = "postgres_types")]
    use bytes::BytesMut;
    #[cfg(feature = "postgres_types")]
    use postgres_types::{FromSql, IsNull, ToSql, Type};

    #[cfg(feature = "postgres_types")]
    #[test]
    fn test_from_sql() {
        let raw = b"Hello There";
        let t = Type::TEXT;
        let s = StackString::from_sql(&t, raw).unwrap();
        assert_eq!(s, StackString::from("Hello There"));

        assert!(<StackString as FromSql>::accepts(&t));
    }

    #[cfg(feature = "postgres_types")]
    #[test]
    fn test_to_sql() {
        let s = StackString::from("Hello There");
        let t = Type::TEXT;
        assert!(<StackString as ToSql>::accepts(&t));
        let mut buf = BytesMut::new();
        match s.to_sql(&t, &mut buf).unwrap() {
            IsNull::Yes => assert!(false),
            IsNull::No => {}
        }
        assert_eq!(buf.as_ref(), b"Hello There");
    }

    #[cfg(feature = "rweb-openapi")]
    #[test]
    fn test_entity() {
        use rweb::openapi::Entity;

        assert_eq!(str::describe(), StackString::describe());
    }
}