use crate::color::{ColoredString, Colors, Elem};
use std::fs::Metadata;

#[derive(Debug, PartialEq, Eq, Copy, Clone)]
#[cfg_attr(windows, allow(dead_code))]
pub enum FileType {
    BlockDevice,
    CharDevice,
    Directory { uid: bool },
    File { uid: bool, exec: bool },
    SymLink { is_dir: bool },
    Pipe,
    Socket,
    Special,
}

impl FileType {
    #[cfg(windows)]
    const EXECUTABLE_EXTENSIONS: &'static [&'static str] = &["exe", "msi", "bat", "ps1"];

    #[cfg(unix)]
    pub fn new(
        meta: &Metadata,
        symlink_meta: Option<&Metadata>,
        permissions: &crate::meta::Permissions,
    ) -> Self {
        use std::os::unix::fs::FileTypeExt;

        let file_type = meta.file_type();

        if file_type.is_file() {
            FileType::File {
                exec: permissions.is_executable(),
                uid: permissions.setuid,
            }
        } else if file_type.is_dir() {
            FileType::Directory {
                uid: permissions.setuid,
            }
        } else if file_type.is_fifo() {
            FileType::Pipe
        } else if file_type.is_symlink() {
            FileType::SymLink {
                // if broken, defaults to false
                is_dir: symlink_meta.map(|m| m.is_dir()).unwrap_or_default(),
            }
        } else if file_type.is_char_device() {
            FileType::CharDevice
        } else if file_type.is_block_device() {
            FileType::BlockDevice
        } else if file_type.is_socket() {
            FileType::Socket
        } else {
            FileType::Special
        }
    }

    #[cfg(windows)]
    pub fn new(meta: &Metadata, symlink_meta: Option<&Metadata>, path: &std::path::Path) -> Self {
        let file_type = meta.file_type();

        if file_type.is_file() {
            let exec = path
                .extension()
                .map(|ext| {
                    Self::EXECUTABLE_EXTENSIONS
                        .iter()
                        .map(std::ffi::OsStr::new)
                        .any(|exec_ext| ext == exec_ext)
                })
                .unwrap_or(false);
            FileType::File { exec, uid: false }
        } else if file_type.is_dir() {
            FileType::Directory { uid: false }
        } else if file_type.is_symlink() {
            FileType::SymLink {
                // if broken, defaults to false
                is_dir: symlink_meta.map(|m| m.is_dir()).unwrap_or_default(),
            }
        } else {
            FileType::Special
        }
    }

    pub fn is_dirlike(self) -> bool {
        matches!(
            self,
            FileType::Directory { .. } | FileType::SymLink { is_dir: true }
        )
    }
}

impl FileType {
    pub fn render(self, colors: &Colors) -> ColoredString {
        match self {
            FileType::File { exec, .. } => colors.colorize('.', &Elem::File { exec, uid: false }),
            FileType::Directory { .. } => colors.colorize('d', &Elem::Dir { uid: false }),
            FileType::Pipe => colors.colorize('|', &Elem::Pipe),
            FileType::SymLink { .. } => colors.colorize('l', &Elem::SymLink),
            FileType::BlockDevice => colors.colorize('b', &Elem::BlockDevice),
            FileType::CharDevice => colors.colorize('c', &Elem::CharDevice),
            FileType::Socket => colors.colorize('s', &Elem::Socket),
            FileType::Special => colors.colorize('?', &Elem::Special),
        }
    }
}

#[cfg(test)]
mod test {
    use super::FileType;
    use crate::color::{Colors, ThemeOption};
    #[cfg(unix)]
    use crate::flags::PermissionFlag;
    #[cfg(unix)]
    use crate::meta::permissions_or_attributes::PermissionsOrAttributes;
    #[cfg(unix)]
    use crate::meta::Permissions;
    use crossterm::style::{Color, Stylize};
    use std::fs::File;
    #[cfg(unix)]
    use std::os::unix::fs::symlink;
    #[cfg(unix)]
    use std::os::unix::net::UnixListener;
    #[cfg(unix)]
    use std::process::Command;
    use tempfile::tempdir;

    #[test]
    #[cfg(unix)] // Windows uses different default permissions
    fn test_file_type() {
        let tmp_dir = tempdir().expect("failed to create temp dir");

        // Create the file;
        let file_path = tmp_dir.path().join("file.txt");
        File::create(&file_path).expect("failed to create file");
        let meta = file_path.metadata().expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);
        let file_type = FileType::new(&meta, None, &Permissions::from(&meta));

        assert_eq!(
            ".".to_string().with(Color::AnsiValue(184)),
            file_type.render(&colors)
        );
    }

    #[test]
    fn test_dir_type() {
        let tmp_dir = tempdir().expect("failed to create temp dir");
        #[cfg(not(windows))]
        let meta = crate::meta::Meta::from_path(tmp_dir.path(), false, PermissionFlag::Rwx)
            .expect("failed to get tempdir path");
        let metadata = tmp_dir.path().metadata().expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);

        #[cfg(not(windows))]
        let file_type = match meta.permissions_or_attributes {
            Some(PermissionsOrAttributes::Permissions(permissions)) => {
                FileType::new(&metadata, None, &permissions)
            }
            _ => panic!("unexpected"),
        };
        #[cfg(windows)]
        let file_type = FileType::new(&metadata, None, tmp_dir.path());

        assert_eq!(
            "d".to_string().with(Color::AnsiValue(33)),
            file_type.render(&colors)
        );
    }

    #[test]
    #[cfg(unix)] // Symlink support is *hard* on Windows
    fn test_symlink_type_file() {
        let tmp_dir = tempdir().expect("failed to create temp dir");

        // Create the file;
        let file_path = tmp_dir.path().join("file.tmp");
        File::create(&file_path).expect("failed to create file");

        // Create the symlink
        let symlink_path = tmp_dir.path().join("target.tmp");
        symlink(&file_path, &symlink_path).expect("failed to create symlink");
        let meta = symlink_path
            .symlink_metadata()
            .expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);
        let file_type = FileType::new(&meta, Some(&meta), &Permissions::from(&meta));

        assert_eq!(
            "l".to_string().with(Color::AnsiValue(44)),
            file_type.render(&colors)
        );
    }

    #[test]
    #[cfg(unix)]
    fn test_symlink_type_dir() {
        let tmp_dir = tempdir().expect("failed to create temp dir");

        // Create directory
        let dir_path = tmp_dir.path().join("dir.d");
        std::fs::create_dir(&dir_path).expect("failed to create dir");

        // Create symlink
        let symlink_path = tmp_dir.path().join("target.d");
        symlink(&dir_path, &symlink_path).expect("failed to create symlink");
        let meta = symlink_path
            .symlink_metadata()
            .expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);
        let file_type = FileType::new(&meta, Some(&meta), &Permissions::from(&meta));

        assert_eq!(
            "l".to_string().with(Color::AnsiValue(44)),
            file_type.render(&colors)
        );
    }

    #[test]
    #[cfg(unix)] // Windows pipes aren't like Unix pipes
    fn test_pipe_type() {
        let tmp_dir = tempdir().expect("failed to create temp dir");

        // Create the pipe;
        let pipe_path = tmp_dir.path().join("pipe.tmp");
        let success = Command::new("mkfifo")
            .arg(&pipe_path)
            .status()
            .expect("failed to exec mkfifo")
            .success();
        assert!(success, "failed to exec mkfifo");
        let meta = pipe_path.metadata().expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);
        let file_type = FileType::new(&meta, None, &Permissions::from(&meta));

        assert_eq!(
            "|".to_string().with(Color::AnsiValue(44)),
            file_type.render(&colors)
        );
    }

    #[test]
    #[cfg(feature = "sudo")]
    fn test_char_device_type() {
        let tmp_dir = tempdir().expect("failed to create temp dir");

        // Create the char device;
        let char_device_path = tmp_dir.path().join("char-device.tmp");
        let success = Command::new("sudo")
            .arg("mknod")
            .arg(&char_device_path)
            .arg("c")
            .arg("89")
            .arg("1")
            .status()
            .expect("failed to exec mknod")
            .success();
        assert!(success, "failed to exec mknod");
        let meta = char_device_path.metadata().expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);
        let file_type = FileType::new(&meta, None, &Permissions::from(&meta));

        assert_eq!(
            "c".to_string().with(Color::AnsiValue(44)),
            file_type.render(&colors)
        );
    }

    #[test]
    #[cfg(unix)] // Sockets don't work the same way on Windows
    fn test_socket_type() {
        let tmp_dir = tempdir().expect("failed to create temp dir");

        // Create the socket;
        let socket_path = tmp_dir.path().join("socket.tmp");
        UnixListener::bind(&socket_path).expect("failed to create the socket");
        let meta = socket_path.metadata().expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);
        let file_type = FileType::new(&meta, None, &Permissions::from(&meta));

        assert_eq!(
            "s".to_string().with(Color::AnsiValue(44)),
            file_type.render(&colors)
        );
    }

    #[cfg(windows)]
    #[test]
    fn test_file_executable() {
        let tmp_dir = tempdir().expect("failed to create temp dir");
        for ext in FileType::EXECUTABLE_EXTENSIONS {
            // Create the file;
            let file_path = tmp_dir.path().join(format!("file.{ext}"));
            File::create(&file_path).expect("failed to create file");
            let meta = file_path.metadata().expect("failed to get metas");

            let colors = Colors::new(ThemeOption::NoLscolors);
            let file_type = FileType::new(&meta, None, &file_path);

            assert_eq!(
                ".".to_string().with(Color::AnsiValue(40)),
                file_type.render(&colors)
            );
        }
    }

    #[cfg(windows)]
    #[test]
    fn test_file_not_executable() {
        let tmp_dir = tempdir().expect("failed to create temp dir");
        // Create the file;
        let file_path = tmp_dir.path().join("file.txt");
        File::create(&file_path).expect("failed to create file");
        let meta = file_path.metadata().expect("failed to get metas");

        let colors = Colors::new(ThemeOption::NoLscolors);
        let file_type = FileType::new(&meta, None, &file_path);

        assert_eq!(
            ".".to_string().with(Color::AnsiValue(184)),
            file_type.render(&colors)
        );
    }
}