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use std::env;
use std::io::Result;
use std::path::{Path, PathBuf};
use std::sync::{Arc, Mutex, MutexGuard};

use FileSystem;
#[cfg(unix)]
use UnixFileSystem;
#[cfg(feature = "temp")]
use {TempDir, TempFileSystem};

#[cfg(feature = "temp")]
pub use self::tempdir::FakeTempDir;

use self::file::{Dir, FakeFile, File};
use self::registry::Registry;

mod file;
mod registry;
#[cfg(feature = "temp")]
mod tempdir;

/// An in-memory file system.
#[derive(Clone, Debug, Default)]
pub struct FakeFileSystem {
    registry: Arc<Mutex<Registry>>,
}

impl FakeFileSystem {
    pub fn new() -> Self {
        let registry = Registry::new();

        FakeFileSystem { registry: Arc::new(Mutex::new(registry)) }
    }

    fn apply<F, T>(&self, path: &Path, f: F) -> T
        where F: FnOnce(&MutexGuard<Registry>, &Path) -> T
    {
        let registry = self.registry.lock().unwrap();
        let storage;
        let path = if path.is_relative() {
            storage = registry.current_dir()
                .unwrap_or_else(|_| PathBuf::from("/"))
                .join(path);
            &storage
        } else {
            path
        };

        f(&registry, path)
    }

    fn apply_mut<F, T>(&self, path: &Path, mut f: F) -> T
        where F: FnMut(&mut MutexGuard<Registry>, &Path) -> T
    {
        let mut registry = self.registry.lock().unwrap();
        let storage;
        let path = if path.is_relative() {
            storage = registry.current_dir()
                .unwrap_or_else(|_| PathBuf::from("/"))
                .join(path);
            &storage
        } else {
            path
        };

        f(&mut registry, path)
    }
}

impl FileSystem for FakeFileSystem {
    fn current_dir(&self) -> Result<PathBuf> {
        let registry = self.registry.lock().unwrap();
        registry.current_dir()
    }

    fn set_current_dir<P: AsRef<Path>>(&self, path: P) -> Result<()> {
        self.apply_mut(path.as_ref(), |mut r, p| r.set_current_dir(p.to_path_buf()))
    }

    fn is_dir<P: AsRef<Path>>(&self, path: P) -> bool {
        self.apply(path.as_ref(), |r, p| r.is_dir(p))
    }

    fn is_file<P: AsRef<Path>>(&self, path: P) -> bool {
        self.apply(path.as_ref(), |r, p| r.is_file(p))
    }

    fn create_dir<P: AsRef<Path>>(&self, path: P) -> Result<()> {
        self.apply_mut(path.as_ref(), |r, p| r.create_dir(p))
    }

    fn create_dir_all<P: AsRef<Path>>(&self, path: P) -> Result<()> {
        self.apply_mut(path.as_ref(), |r, p| r.create_dir_all(p))
    }

    fn remove_dir<P: AsRef<Path>>(&self, path: P) -> Result<()> {
        self.apply_mut(path.as_ref(), |r, p| r.remove_dir(p))
    }

    fn remove_dir_all<P: AsRef<Path>>(&self, path: P) -> Result<()> {
        self.apply_mut(path.as_ref(), |r, p| r.remove_dir_all(p))
    }

    fn create_file<P, B>(&self, path: P, buf: B) -> Result<()>
        where P: AsRef<Path>,
              B: AsRef<[u8]>
    {
        self.apply_mut(path.as_ref(), |r, p| r.create_file(p, buf.as_ref()))
    }

    fn write_file<P, B>(&self, path: P, buf: B) -> Result<()>
        where P: AsRef<Path>,
              B: AsRef<[u8]>
    {
        self.apply_mut(path.as_ref(), |r, p| r.write_file(p, buf.as_ref()))
    }

    fn read_file<P: AsRef<Path>>(&self, path: P) -> Result<Vec<u8>> {
        self.apply(path.as_ref(), |r, p| r.read_file(p))
    }

    fn readonly<P: AsRef<Path>>(&self, path: P) -> Result<bool> {
        self.apply(path.as_ref(), |r, p| r.readonly(p))
    }

    fn set_readonly<P: AsRef<Path>>(&self, path: P, readonly: bool) -> Result<()> {
        self.apply_mut(path.as_ref(), |r, p| r.set_readonly(p, readonly))
    }
}

#[cfg(unix)]
impl UnixFileSystem for FakeFileSystem {
    fn mode<P: AsRef<Path>>(&self, path: P) -> Result<u32> {
        self.apply(path.as_ref(), |r, p| r.mode(p))
    }

    fn set_mode<P: AsRef<Path>>(&self, path: P, mode: u32) -> Result<()> {
        self.apply_mut(path.as_ref(), |r, p| r.set_mode(p, mode))
    }
}

#[cfg(feature = "temp")]
impl TempFileSystem for FakeFileSystem {
    type TempDir = FakeTempDir;

    fn temp_dir<S: AsRef<str>>(&self, prefix: S) -> Result<Self::TempDir> {
        let base = env::temp_dir();
        let dir = FakeTempDir::new(Arc::downgrade(&self.registry), &base, prefix.as_ref());

        self.create_dir_all(&dir.path())
            .and(Ok(dir))
    }
}