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use std::{
    borrow::Cow,
    collections::{hash_map::DefaultHasher, HashMap},
    fs,
    hash::{Hash, Hasher},
    io::{self, BufReader, Read},
    path::{Path, PathBuf},
    str,
};

type Result<T> = std::result::Result<T, io::Error>;

/// etag for an asset
pub fn etag(path: &str) -> Cow<str> {
    if is_bundled() {
        Cow::from(crate::BUILD_DATE)
    } else {
        let mut hasher = DefaultHasher::new();
        last_modified(path).hash(&mut hasher);
        Cow::from(format!("{:x}", hasher.finish()))
    }
}

fn last_modified(path: &str) -> Option<String> {
    let path = normalize_path(path)?;
    if let Ok(meta) = fs::metadata(path) {
        if let Ok(time) = meta.modified() {
            return Some(format!("{:?}", time));
        }
    }
    None
}

pub fn normalize_path(path: &str) -> Option<String> {
    if let Some(root) = asset_dir() {
        Some(format!(
            "{}/{}",
            root,
            path.trim_start_matches(root)
                .trim_start_matches('.')
                .trim_start_matches('/')
                .replace("..", ".")
        ))
    } else {
        None
    }
}

/// Have assets been bundled into the binary?
pub fn is_bundled() -> bool {
    bundled_assets().is_some()
}

fn bundled_assets() -> Option<&'static HashMap<String, &'static [u8]>> {
    unsafe { crate::BUNDLED_ASSETS.as_ref() }
}

fn asset_dir() -> Option<&'static str> {
    unsafe { crate::ASSET_DIR }
}

/// Does the asset exist on disk? `path` is the relative path,
/// ex: asset::exists("index.html") checks for "./static/index.html"
/// (or in the embedded fs, in release mode).
pub fn exists(path: &str) -> bool {
    if let Some(path) = normalize_path(path) {
        if is_bundled() {
            return bundled_assets().unwrap().contains_key(&path);
        } else {
            if let Ok(mut file) = fs::File::open(path) {
                if let Ok(meta) = file.metadata() {
                    return !meta.is_dir();
                }
            }
        }
    }
    false
}

/// Like fs::read_to_string(), but with an asset.
pub fn to_string(path: &str) -> Result<String> {
    if let Some(bytes) = read(path) {
        if let Ok(utf8) = str::from_utf8(bytes.as_ref()) {
            return Ok(utf8.to_string());
        }
    }

    Err(io::Error::new(
        io::ErrorKind::NotFound,
        format!("{} not found", path),
    ))
}

pub fn as_reader(path: &str) -> Option<Box<dyn io::Read>> {
    let path = normalize_path(path)?;
    if is_bundled() {
        if let Some(v) = bundled_assets().unwrap().get(&path) {
            return Some(Box::new(*v));
        }
    } else {
        if let Ok(mut file) = fs::File::open(path) {
            if let Ok(meta) = file.metadata() {
                if !meta.is_dir() {
                    return Some(Box::new(BufReader::new(file)));
                }
            }
        }
    }
    None
}

/// Read a file to [u8].
pub fn read(path: &str) -> Option<Cow<'static, [u8]>> {
    let path = normalize_path(path)?;
    if is_bundled() {
        if let Some(v) = bundled_assets().unwrap().get(&path) {
            return Some(Cow::from(*v));
        }
    } else {
        let mut buf = vec![];
        if let Ok(mut file) = fs::File::open(path) {
            if let Ok(meta) = file.metadata() {
                if !meta.is_dir() && file.read_to_end(&mut buf).is_ok() {
                    return Some(Cow::from(buf));
                }
            }
        }
    }
    None
}

pub fn iter(dir: &str) -> std::vec::IntoIter<PathBuf> {
    if let Ok(files) = files_in_dir(dir) {
        files.into_iter()
    } else {
        vec![].into_iter()
    }
}

fn files_in_dir(path: &str) -> Result<Vec<PathBuf>> {
    let mut files = vec![];
    for entry in fs::read_dir(path)? {
        let entry = entry?;
        let path = entry.path();
        let meta = fs::metadata(&path)?;
        if meta.is_dir() {
            files.extend_from_slice(&files_in_dir(path.to_str().unwrap_or("bad"))?);
        } else {
            files.push(path);
        }
    }
    Ok(files)
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_iter() {
        assert!(iter(".").count() > 0);

        let mut expected = vec!["./Cargo.toml", "./LICENSE"]
            .iter()
            .map(|s| s.to_string())
            .collect::<Vec<_>>();

        for file in iter(".").take(2) {
            assert_eq!(expected.remove(0), file.to_str().unwrap());
        }
    }
}