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use std::fs;
use std::{
    io,
    path::{Path, PathBuf},
};

use crate::{copy_dir, DirectoryOperation, RollbackableOperation};

/// Copies a file to destination
pub struct CopyFile {
    source: PathBuf,
    dest: PathBuf,
}

impl CopyFile {
    /// Constructs a new CopyFile operation
    pub fn new<S: AsRef<Path>, T: AsRef<Path>>(source: S, dest: T) -> Self {
        Self {
            source: source.as_ref().into(),
            dest: dest.as_ref().into(),
        }
    }
}

impl RollbackableOperation for CopyFile {
    fn execute(&mut self) -> io::Result<()> {
        match fs::copy(&self.source, &self.dest) {
            Ok(_v) => Ok(()),
            Err(e) => Err(e),
        }
    }

    fn rollback(&self) -> io::Result<()> {
        fs::remove_file(&self.dest)
    }
}

/// Copies a directory to destination
pub struct CopyDirectory {
    source: PathBuf,
    dest: PathBuf,
    backup_path: PathBuf,
    temp_dir: PathBuf,
}

impl CopyDirectory {
    /// Constructs a new CopyDirectory operation
    pub fn new<S: AsRef<Path>, T: AsRef<Path>, U: AsRef<Path>>(
        source: S,
        dest: T,
        temp_dir: U,
    ) -> Self {
        Self {
            source: source.as_ref().into(),
            dest: dest.as_ref().into(),
            temp_dir: temp_dir.as_ref().into(),
            backup_path: PathBuf::new(),
        }
    }
}

impl RollbackableOperation for CopyDirectory {
    fn execute(&mut self) -> io::Result<()> {
        self.create_backup_folder()?;
        copy_dir(&self.source, &self.dest)
    }

    fn rollback(&self) -> io::Result<()> {
        fs::remove_dir_all(&self.dest)
    }
}

impl DirectoryOperation for CopyDirectory {
    fn get_path(&self) -> &Path {
        &self.source
    }

    fn get_backup_path(&self) -> &Path {
        &self.backup_path
    }

    fn set_backup_path<S: AsRef<Path>>(&mut self, uuid: S) {
        self.backup_path = uuid.as_ref().into();
    }

    fn get_temp_dir(&self) -> &Path {
        &self.temp_dir
    }
}

impl Drop for CopyDirectory {
    fn drop(&mut self) {
        match self.dispose() {
            Err(e) => eprintln!("{}", e),
            _ => {}
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::fs::{self, File};
    use std::path::Path;

    const FILE_SOURCE: &str = "./copy_file_source.txt";
    const DEST_DIR: &str = "./copy_file_dir";
    const FILE_DEST: &str = "./copy_file_dir/copy_file_source.txt";

    fn file_setup() -> std::io::Result<()> {
        File::create(FILE_SOURCE)?;
        fs::create_dir(DEST_DIR)
    }

    #[test]
    #[allow(unused_must_use)]
    fn copy_file_works() {
        assert_eq!((), file_setup().unwrap());

        let mut op = CopyFile::new(FILE_SOURCE, FILE_DEST);

        assert_eq!(false, Path::new(FILE_DEST).exists());
        assert_eq!((), op.execute().unwrap());
        assert_eq!(true, Path::new(FILE_SOURCE).exists());
        assert_eq!(true, Path::new(FILE_DEST).exists());

        assert_eq!((), op.rollback().unwrap());
        assert_eq!(true, Path::new(FILE_SOURCE).exists());
        assert_eq!(false, Path::new(FILE_DEST).exists());

        fs::remove_file(FILE_SOURCE);
        fs::remove_dir_all(DEST_DIR);
    }

    const DIR_SOURCE: &str = "./copy_dir_source";
    const DIR_DIR: &str = "./copy_dest_dir";
    const DIR_DEST: &str = "./copy_dest_dir/copy_dir_source";
    const DIR_TEMP: &str = "./tmp";

    fn folder_setup() -> std::io::Result<()> {
        fs::create_dir(DIR_SOURCE)?;
        fs::create_dir(DIR_DIR)
    }

    #[test]
    #[allow(unused_must_use)]
    fn copy_dir_works() {
        assert_eq!((), folder_setup().unwrap());

        let mut op = CopyDirectory::new(DIR_SOURCE, DIR_DEST, DIR_TEMP);

        assert_eq!((), op.execute().unwrap());
        assert_eq!(true, Path::new(DIR_SOURCE).exists());
        assert_eq!(true, Path::new(DIR_DEST).exists());

        assert_eq!((), op.rollback().unwrap());
        assert_eq!(true, Path::new(DIR_SOURCE).exists());
        assert_eq!(false, Path::new(DIR_DEST).exists());

        fs::remove_dir_all(DIR_SOURCE);
        fs::remove_dir(DIR_DIR);
    }
}