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use libc::{c_char, c_int, size_t};
use std::cmp::Ordering;
use std::ffi::{CString, OsStr, OsString};
use std::iter::IntoIterator;
use std::path::{Path, PathBuf};

use crate::{raw, Error};

#[doc(hidden)]
pub trait IsNull {
    fn is_ptr_null(&self) -> bool;
}
impl<T> IsNull for *const T {
    fn is_ptr_null(&self) -> bool {
        self.is_null()
    }
}
impl<T> IsNull for *mut T {
    fn is_ptr_null(&self) -> bool {
        self.is_null()
    }
}

#[doc(hidden)]
pub trait Binding: Sized {
    type Raw;

    unsafe fn from_raw(raw: Self::Raw) -> Self;
    fn raw(&self) -> Self::Raw;

    unsafe fn from_raw_opt<T>(raw: T) -> Option<Self>
    where
        T: Copy + IsNull,
        Self: Binding<Raw = T>,
    {
        if raw.is_ptr_null() {
            None
        } else {
            Some(Binding::from_raw(raw))
        }
    }
}

pub fn iter2cstrs<T, I>(
    iter: I,
) -> Result<(Vec<CString>, Vec<*const c_char>, raw::git_strarray), Error>
where
    T: IntoCString,
    I: IntoIterator<Item = T>,
{
    let cstrs = iter
        .into_iter()
        .map(|i| i.into_c_string())
        .collect::<Result<Vec<CString>, _>>()?;
    let ptrs = cstrs.iter().map(|i| i.as_ptr()).collect::<Vec<_>>();
    let raw = raw::git_strarray {
        strings: ptrs.as_ptr() as *mut _,
        count: ptrs.len() as size_t,
    };
    Ok((cstrs, ptrs, raw))
}

#[cfg(unix)]
pub fn bytes2path(b: &[u8]) -> &Path {
    use std::os::unix::prelude::*;
    Path::new(OsStr::from_bytes(b))
}
#[cfg(windows)]
pub fn bytes2path(b: &[u8]) -> &Path {
    use std::str;
    Path::new(str::from_utf8(b).unwrap())
}

/// A class of types that can be converted to C strings.
///
/// These types are represented internally as byte slices and it is quite rare
/// for them to contain an interior 0 byte.
pub trait IntoCString {
    /// Consume this container, converting it into a CString
    fn into_c_string(self) -> Result<CString, Error>;
}

impl<'a, T: IntoCString + Clone> IntoCString for &'a T {
    fn into_c_string(self) -> Result<CString, Error> {
        self.clone().into_c_string()
    }
}

impl<'a> IntoCString for &'a str {
    fn into_c_string(self) -> Result<CString, Error> {
        Ok(CString::new(self)?)
    }
}

impl IntoCString for String {
    fn into_c_string(self) -> Result<CString, Error> {
        Ok(CString::new(self.into_bytes())?)
    }
}

impl IntoCString for CString {
    fn into_c_string(self) -> Result<CString, Error> {
        Ok(self)
    }
}

impl<'a> IntoCString for &'a Path {
    fn into_c_string(self) -> Result<CString, Error> {
        let s: &OsStr = self.as_ref();
        s.into_c_string()
    }
}

impl IntoCString for PathBuf {
    fn into_c_string(self) -> Result<CString, Error> {
        let s: OsString = self.into();
        s.into_c_string()
    }
}

impl<'a> IntoCString for &'a OsStr {
    fn into_c_string(self) -> Result<CString, Error> {
        self.to_os_string().into_c_string()
    }
}

impl IntoCString for OsString {
    #[cfg(unix)]
    fn into_c_string(self) -> Result<CString, Error> {
        use std::os::unix::prelude::*;
        let s: &OsStr = self.as_ref();
        Ok(CString::new(s.as_bytes())?)
    }
    #[cfg(windows)]
    fn into_c_string(self) -> Result<CString, Error> {
        match self.to_str() {
            Some(s) => s.into_c_string(),
            None => Err(Error::from_str(
                "only valid unicode paths are accepted \
                 on windows",
            )),
        }
    }
}

impl<'a> IntoCString for &'a [u8] {
    fn into_c_string(self) -> Result<CString, Error> {
        Ok(CString::new(self)?)
    }
}

impl IntoCString for Vec<u8> {
    fn into_c_string(self) -> Result<CString, Error> {
        Ok(CString::new(self)?)
    }
}

pub fn into_opt_c_string<S>(opt_s: Option<S>) -> Result<Option<CString>, Error>
where
    S: IntoCString,
{
    match opt_s {
        None => Ok(None),
        Some(s) => Ok(Some(s.into_c_string()?)),
    }
}

pub fn c_cmp_to_ordering(cmp: c_int) -> Ordering {
    match cmp {
        0 => Ordering::Equal,
        n if n < 0 => Ordering::Less,
        _ => Ordering::Greater,
    }
}