use crate::AyaFS;
use fuser::{
    Filesystem, KernelConfig, ReplyAttr, ReplyData, ReplyDirectory, ReplyEmpty, ReplyEntry,
    ReplyLseek, ReplyWrite, Request, TimeOrNow,
};
use libc::{c_int, ENOENT, ENOSPC, ENOSYS};
use log::debug;
use std::ffi::OsStr;
use std::time::SystemTime;

impl Filesystem for AyaFS {
    fn init(&mut self, _req: &Request<'_>, _config: &mut KernelConfig) -> Result<(), c_int> {
        debug!("Filesystem::init called.");
        Ok(())
    }

    fn destroy(&mut self) {
        debug!("Filesystem::destroy()");
    }

    fn lookup(&mut self, _req: &Request<'_>, parent: u64, name: &OsStr, reply: ReplyEntry) {
        debug!(
            "Filesystem::lookup called with parent {} name {}",
            parent,
            name.to_str().unwrap()
        );
        let parent = parent as usize;
        if let Some(inode) = self.get_inode(parent) {
            // debug!("{:?}", inode);
        }
        // if self.inode_active(parent) {
        //     let (block, offset) = self.locate_inode(parent);
        //     let inode = self.get_inode(block, offset);
        //     debug!("{:?}", inode);
        // }
        reply.error(ENOENT);
    }

    fn forget(&mut self, _req: &Request<'_>, _ino: u64, _nlookup: u64) {
        debug!("Filesystem::forget()");
        todo!("This is a dumb implementation")
    }

    fn getattr(&mut self, _req: &Request<'_>, ino: u64, reply: ReplyAttr) {
        debug!("Filesystem::getattr(ino: {})", ino);
        let ino = ino as usize;
        if let Some(inode) = self.get_inode(ino) {
            // debug!("{:?}", inode);
        }
        reply.error(ENOENT);
    }

    fn setattr(
        &mut self,
        _req: &Request<'_>,
        ino: u64,
        mode: Option<u32>,
        uid: Option<u32>,
        gid: Option<u32>,
        size: Option<u64>,
        _atime: Option<TimeOrNow>,
        _mtime: Option<TimeOrNow>,
        _ctime: Option<SystemTime>,
        fh: Option<u64>,
        _crtime: Option<SystemTime>,
        _chgtime: Option<SystemTime>,
        _bkuptime: Option<SystemTime>,
        flags: Option<u32>,
        reply: ReplyAttr,
    ) {
        debug!(
            "Filesystem::setattr(ino: {:#x?}, mode: {:?}, uid: {:?}, \
            gid: {:?}, size: {:?}, fh: {:?}, flags: {:?})",
            ino, mode, uid, gid, size, fh, flags
        );
        reply.error(ENOSYS);
    }

    fn readlink(&mut self, _req: &Request<'_>, ino: u64, reply: ReplyData) {
        debug!("[Not Implemented] readlink(ino: {})", ino);
        reply.error(ENOSYS);
    }

    fn mknod(
        &mut self,
        _req: &Request<'_>,
        parent: u64,
        name: &OsStr,
        mode: u32,
        umask: u32,
        rdev: u32,
        reply: ReplyEntry,
    ) {
        debug!(
            "Filesystem::mknod(parent: {}, name: {:?}, mode: {}, umask: {}, rdev: {})",
            parent, name, mode, umask, rdev
        );
        reply.error(ENOSPC);
    }

    fn mkdir(
        &mut self,
        _req: &Request<'_>,
        parent: u64,
        name: &OsStr,
        mode: u32,
        umask: u32,
        reply: ReplyEntry,
    ) {
        debug!(
            "Filesystem::mkdir(parent: {}, name: {:?}, mode: {}, umask: {})",
            parent, name, mode, umask
        );
        if let Some(inode) = self.get_inode(parent as usize) {
        } else {
            reply.error(ENOENT);
        }
        // reply.error(ENOSPC);
    }

    fn read(
        &mut self,
        _req: &Request<'_>,
        ino: u64,
        _fh: u64,
        offset: i64,
        _size: u32,
        _flags: i32,
        _lock_owner: Option<u64>,
        reply: ReplyData,
    ) {
        todo!()
    }

    fn readdir(
        &mut self,
        _req: &Request<'_>,
        ino: u64,
        _fh: u64,
        offset: i64,
        mut reply: ReplyDirectory,
    ) {
        todo!()
    }

    fn access(&mut self, _req: &Request<'_>, ino: u64, mask: i32, reply: ReplyEmpty) {
        debug!("Filesystem::getattr(ino: {}, mask: {})", ino, mask);
        if let Some(inode) = self.get_inode(ino as usize) {
            reply.ok()
        } else {
            reply.error(ENOENT)
        }
    }

    fn lseek(
        &mut self,
        _req: &Request<'_>,
        ino: u64,
        fh: u64,
        offset: i64,
        whence: i32,
        reply: ReplyLseek,
    ) {
        debug!(
            "lseek(ino: {:#x?}, fh: {}, offset: {}, whence: {})",
            ino, fh, offset, whence
        );
        reply.error(ENOSYS);
    }

    fn copy_file_range(
        &mut self,
        _req: &Request<'_>,
        ino_in: u64,
        fh_in: u64,
        offset_in: i64,
        ino_out: u64,
        fh_out: u64,
        offset_out: i64,
        len: u64,
        flags: u32,
        reply: ReplyWrite,
    ) {
        debug!(
            "copy_file_range(ino_in: {:#x?}, fh_in: {}, \
            offset_in: {}, ino_out: {:#x?}, fh_out: {}, offset_out: {}, \
            len: {}, flags: {})",
            ino_in, fh_in, offset_in, ino_out, fh_out, offset_out, len, flags
        );
        reply.error(ENOSYS);
    }
}