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use std::borrow::{Borrow, Cow};
use std::io::{self, Cursor, Error, ErrorKind, Read};

#[cfg(feature = "flate2")]
use flate2::bufread::GzDecoder;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Compression {
    None,
    #[cfg(feature = "flate2")]
    Gzip,
}

/// Runtime access to the included files
pub struct Files {
    #[doc(hidden)]
    pub files: phf::Map<&'static str, (Compression, &'static [u8])>,
}

#[cfg(windows)]
fn as_key(path: &str) -> Cow<str> {
    Cow::Owned(path.replace("\\", "/"))
}

#[cfg(not(windows))]
fn as_key(path: &str) -> Cow<str> {
    Cow::Borrowed(path)
}

impl Files {
    pub fn file_names(&'static self) -> FileNames {
        FileNames {
            iter: self.files.keys(),
        }
    }

    pub fn is_available(&self, path: &str) -> bool {
        self.files.contains_key(path)
    }

    pub fn get(&self, path: &str) -> io::Result<Cow<'static, [u8]>> {
        match self.get_raw(path) {
            Ok((Compression::None, data)) => Ok(data),
            #[cfg(feature = "flate2")]
            Ok((Compression::Gzip, compressed)) => {
                let mut r = GzDecoder::new(Cursor::new(compressed));
                let mut v = Vec::new();
                r.read_to_end(&mut v)?;
                Ok(Cow::Owned(v))
            }
            Err(e) => Err(e),
        }
    }

    pub fn get_raw(&self, path: &str) -> io::Result<(Compression, Cow<'static, [u8]>)> {
        let key = as_key(path);

        self.files
            .get(&*key)
            .map(|&(c, d)| (c, Cow::Owned(d.to_owned())))
            .ok_or_else(|| Error::new(ErrorKind::NotFound, "Key not found"))
    }

    pub fn read(&self, path: &str) -> io::Result<Box<dyn Read>> {
        let key = as_key(path);
        match self.files.get(key.borrow() as &str) {
            Some(b) => match b.0 {
                Compression::None => Ok(Box::new(Cursor::new(b.1))),
                #[cfg(feature = "flate2")]
                Compression::Gzip => Ok(Box::new(GzDecoder::new(Cursor::new(b.1)))),
            },
            None => Err(Error::new(ErrorKind::NotFound, "Key not found")),
        }
    }
}

/// Iterates over the file names available for `Files` object.
pub struct FileNames {
    // Our internal iterator.  We wrap this in a nice struct so our
    // caller doesn't need to know the details.
    iter: phf::map::Keys<'static, &'static str, (Compression, &'static [u8])>,
}

impl Iterator for FileNames {
    type Item = &'static str;

    fn next(&mut self) -> Option<Self::Item> {
        self.iter.next().cloned()
    }
}