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use num_enum::{IntoPrimitive, TryFromPrimitive};

use crate::{bindings, const_conversions};

bitflags::bitflags! {
    /// Open flags, as used e.g. with `open`.
    #[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
    pub struct OFlag: i32 {
        const O_ACCMODE = const_conversions::i32_from_u32(bindings::LINUX_O_ACCMODE);
        const O_RDONLY = const_conversions::i32_from_u32(bindings::LINUX_O_RDONLY);
        const O_WRONLY = const_conversions::i32_from_u32(bindings::LINUX_O_WRONLY);
        const O_RDWR = const_conversions::i32_from_u32(bindings::LINUX_O_RDWR);
        const O_CREAT = const_conversions::i32_from_u32(bindings::LINUX_O_CREAT);
        const O_EXCL = const_conversions::i32_from_u32(bindings::LINUX_O_EXCL);
        const O_NOCTTY = const_conversions::i32_from_u32(bindings::LINUX_O_NOCTTY);
        const O_TRUNC = const_conversions::i32_from_u32(bindings::LINUX_O_TRUNC);
        const O_APPEND = const_conversions::i32_from_u32(bindings::LINUX_O_APPEND);
        const O_NONBLOCK = const_conversions::i32_from_u32(bindings::LINUX_O_NONBLOCK);
        const O_DSYNC = const_conversions::i32_from_u32(bindings::LINUX_O_DSYNC);
        const O_DIRECT = const_conversions::i32_from_u32(bindings::LINUX_O_DIRECT);
        const O_LARGEFILE = const_conversions::i32_from_u32(bindings::LINUX_O_LARGEFILE);
        const O_DIRECTORY = const_conversions::i32_from_u32(bindings::LINUX_O_DIRECTORY);
        const O_NOFOLLOW = const_conversions::i32_from_u32(bindings::LINUX_O_NOFOLLOW);
        const O_NOATIME = const_conversions::i32_from_u32(bindings::LINUX_O_NOATIME);
        const O_CLOEXEC = const_conversions::i32_from_u32(bindings::LINUX_O_CLOEXEC);
        const O_SYNC = const_conversions::i32_from_u32(bindings::LINUX_O_SYNC);
        const O_PATH = const_conversions::i32_from_u32(bindings::LINUX_O_PATH);
        const O_TMPFILE = const_conversions::i32_from_u32(bindings::LINUX_O_TMPFILE);
        const O_NDELAY = const_conversions::i32_from_u32(bindings::LINUX_O_NDELAY);
        const O_ASYNC = const_conversions::i32_from_u32(bindings::LINUX_FASYNC);
    }
}

/// fcntl commands, as used with `fcntl`.
#[derive(Debug, Copy, Clone, Eq, PartialEq, IntoPrimitive, TryFromPrimitive)]
#[repr(u32)]
#[allow(non_camel_case_types)]
pub enum FcntlCommand {
    F_DUPFD = bindings::LINUX_F_DUPFD,
    F_GETFD = bindings::LINUX_F_GETFD,
    F_SETFD = bindings::LINUX_F_SETFD,
    F_GETFL = bindings::LINUX_F_GETFL,
    F_SETFL = bindings::LINUX_F_SETFL,
    F_GETLK = bindings::LINUX_F_GETLK,
    F_SETLK = bindings::LINUX_F_SETLK,
    F_SETLKW = bindings::LINUX_F_SETLKW,
    F_SETOWN = bindings::LINUX_F_SETOWN,
    F_GETOWN = bindings::LINUX_F_GETOWN,
    F_SETSIG = bindings::LINUX_F_SETSIG,
    F_GETSIG = bindings::LINUX_F_GETSIG,
    F_SETOWN_EX = bindings::LINUX_F_SETOWN_EX,
    F_GETOWN_EX = bindings::LINUX_F_GETOWN_EX,
    F_GETOWNER_UIDS = bindings::LINUX_F_GETOWNER_UIDS,
    F_OFD_GETLK = bindings::LINUX_F_OFD_GETLK,
    F_OFD_SETLK = bindings::LINUX_F_OFD_SETLK,
    F_OFD_SETLKW = bindings::LINUX_F_OFD_SETLKW,
    F_SETLEASE = bindings::LINUX_F_SETLEASE,
    F_GETLEASE = bindings::LINUX_F_GETLEASE,
    F_NOTIFY = bindings::LINUX_F_NOTIFY,
    F_DUPFD_QUERY = bindings::LINUX_F_DUPFD_QUERY,
    F_DUPFD_CLOEXEC = bindings::LINUX_F_DUPFD_CLOEXEC,
    F_SETPIPE_SZ = bindings::LINUX_F_SETPIPE_SZ,
    F_GETPIPE_SZ = bindings::LINUX_F_GETPIPE_SZ,
    F_ADD_SEALS = bindings::LINUX_F_ADD_SEALS,
    F_GET_SEALS = bindings::LINUX_F_GET_SEALS,
    F_CANCELLK = bindings::LINUX_F_CANCELLK,
    F_GET_RW_HINT = bindings::LINUX_F_GET_RW_HINT,
    F_SET_RW_HINT = bindings::LINUX_F_SET_RW_HINT,
    F_GET_FILE_RW_HINT = bindings::LINUX_F_GET_FILE_RW_HINT,
    F_SET_FILE_RW_HINT = bindings::LINUX_F_SET_FILE_RW_HINT,
}

/// Owner, as used with [`FcntlCommand::F_SETOWN_EX`] and [`FcntlCommand::F_GETOWN_EX`]
#[derive(Debug, Copy, Clone, Eq, PartialEq, IntoPrimitive, TryFromPrimitive)]
#[repr(u32)]
#[allow(non_camel_case_types)]
pub enum FcntlOwner {
    F_OWNER_TID = bindings::LINUX_F_OWNER_TID,
    F_OWNER_PID = bindings::LINUX_F_OWNER_PID,
    F_OWNER_PGRP = bindings::LINUX_F_OWNER_PGRP,
}

/// Lease type, as used with [`FcntlCommand::F_SETLEASE`]
#[derive(Debug, Copy, Clone, Eq, PartialEq, IntoPrimitive, TryFromPrimitive)]
#[repr(u32)]
#[allow(non_camel_case_types)]
pub enum FcntlLeaseType {
    F_RDLCK = bindings::LINUX_F_RDLCK,
    F_WRLCK = bindings::LINUX_F_WRLCK,
    F_UNLCK = bindings::LINUX_F_UNLCK,
    F_EXLCK = bindings::LINUX_F_EXLCK,
    F_SHLCK = bindings::LINUX_F_SHLCK,
}

/// Seal type, as used with [`FcntlCommand::F_ADD_SEALS`] and [`FcntlCommand::F_GET_SEALS`].
#[derive(Debug, Copy, Clone, Eq, PartialEq, IntoPrimitive, TryFromPrimitive)]
#[repr(u32)]
#[allow(non_camel_case_types)]
pub enum FcntlSealType {
    F_SEAL_SEAL = bindings::LINUX_F_SEAL_SEAL,
    F_SEAL_SHRINK = bindings::LINUX_F_SEAL_SHRINK,
    F_SEAL_GROW = bindings::LINUX_F_SEAL_GROW,
    F_SEAL_WRITE = bindings::LINUX_F_SEAL_WRITE,
    F_SEAL_FUTURE_WRITE = bindings::LINUX_F_SEAL_FUTURE_WRITE,
    F_SEAL_EXEC = bindings::LINUX_F_SEAL_EXEC,
}

/// Read-write hint, as used with [`FcntlCommand::F_GET_RW_HINT`] and [`FcntlCommand::F_SET_RW_HINT`].
#[derive(Debug, Copy, Clone, Eq, PartialEq, IntoPrimitive, TryFromPrimitive)]
#[repr(u32)]
#[allow(non_camel_case_types)]
pub enum FcntlRwHint {
    RWH_WRITE_LIFE_NOT_SET = bindings::LINUX_RWH_WRITE_LIFE_NOT_SET,
    RWH_WRITE_LIFE_NONE = bindings::LINUX_RWH_WRITE_LIFE_NONE,
    RWH_WRITE_LIFE_SHORT = bindings::LINUX_RWH_WRITE_LIFE_SHORT,
    RWH_WRITE_LIFE_MEDIUM = bindings::LINUX_RWH_WRITE_LIFE_MEDIUM,
    RWH_WRITE_LIFE_LONG = bindings::LINUX_RWH_WRITE_LIFE_LONG,
    RWH_WRITE_LIFE_EXTREME = bindings::LINUX_RWH_WRITE_LIFE_EXTREME,
}

bitflags::bitflags! {
    /// Descriptor flags, as used with [`FcntlCommand::F_GETFL`] and [`FcntlCommand::F_SETFL`].
    #[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
    pub struct DescriptorFlags: i32 {
        const FD_CLOEXEC = const_conversions::i32_from_u32(bindings::LINUX_FD_CLOEXEC);
    }
}

impl DescriptorFlags {
    pub fn as_o_flags(&self) -> OFlag {
        let mut flags = OFlag::empty();
        if self.contains(Self::FD_CLOEXEC) {
            flags.insert(OFlag::O_CLOEXEC);
        }
        flags
    }

    /// Returns a tuple of the `DescriptorFlags` and any remaining flags.
    pub fn from_o_flags(flags: OFlag) -> (Self, OFlag) {
        let mut remaining = flags;
        let mut flags = Self::empty();

        if remaining.contains(OFlag::O_CLOEXEC) {
            remaining.remove(OFlag::O_CLOEXEC);
            flags.insert(Self::FD_CLOEXEC);
        }

        (flags, remaining)
    }
}

bitflags::bitflags! {
    /// flags for execveat.
    #[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
    pub struct ExecveAtFlags: i32 {
        const AT_EMPTY_PATH = const_conversions::i32_from_u32(bindings::LINUX_AT_EMPTY_PATH);
        const AT_SYMLINK_NOFOLLOW = const_conversions::i32_from_u32(bindings::LINUX_AT_SYMLINK_NOFOLLOW);
    }
}