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use core::{mem, ptr, slice};
use uefi::fs::{File as InnerFile, FileInfo, SimpleFileSystem, FILE_MODE_READ};
use uefi::guid::{Guid, FILE_INFO_ID, FILE_SYSTEM_GUID};
use uefi::status::{Error, Result};

use crate::ffi::wstr;
use crate::proto::Protocol;

pub struct FileSystem(pub &'static mut SimpleFileSystem);

impl Protocol<SimpleFileSystem> for FileSystem {
    fn guid() -> Guid {
        FILE_SYSTEM_GUID
    }

    fn new(inner: &'static mut SimpleFileSystem) -> Self {
        FileSystem(inner)
    }
}

impl FileSystem {
    pub fn root(&mut self) -> Result<Dir> {
        let mut interface = ptr::null_mut::<InnerFile>();
        (self.0.OpenVolume)(self.0, &mut interface)?;

        Ok(Dir(File(unsafe { &mut *interface })))
    }
}

pub struct File(pub &'static mut InnerFile);

impl File {
    pub fn info(&mut self) -> Result<FileInfo> {
        let mut info = FileInfo::default();
        let buf = unsafe {
            slice::from_raw_parts_mut(&mut info as *mut _ as *mut u8, mem::size_of_val(&info))
        };
        let mut len = buf.len();
        (self.0.GetInfo)(self.0, &FILE_INFO_ID, &mut len, buf.as_mut_ptr())?;
        Ok(info)
    }

    pub fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
        let mut len = buf.len();
        (self.0.Read)(self.0, &mut len, buf.as_mut_ptr())?;
        Ok(len)
    }

    pub fn read_to_end(&mut self, vec: &mut Vec<u8>) -> Result<usize> {
        let mut total = 0;

        loop {
            let mut buf = [0; 8192];

            let count = self.read(&mut buf)?;
            if count == 0 {
                break;
            }

            vec.extend(&buf[..count]);
            total += count;
        }

        Ok(total)
    }

    pub fn write(&mut self, buf: &[u8]) -> Result<usize> {
        let mut len = buf.len();
        (self.0.Write)(self.0, &mut len, buf.as_ptr())?;
        Ok(len)
    }
}

impl Drop for File {
    fn drop(&mut self) {
        let _ = (self.0.Close)(self.0);
    }
}

pub struct Dir(pub File);

impl Dir {
    pub fn open(&mut self, filename: &[u16]) -> Result<File> {
        let mut interface = ptr::null_mut::<InnerFile>();
        ((self.0).0.Open)(
            (self.0).0,
            &mut interface,
            filename.as_ptr(),
            FILE_MODE_READ,
            0,
        )?;

        Ok(File(unsafe { &mut *interface }))
    }

    pub fn open_dir(&mut self, filename: &[u16]) -> Result<Dir> {
        let file = self.open(filename)?;
        Ok(Dir(file))
    }

    pub fn read(&mut self) -> Result<Option<FileInfo>> {
        let mut info = FileInfo::default();
        let buf = unsafe {
            slice::from_raw_parts_mut(&mut info as *mut _ as *mut u8, mem::size_of_val(&info))
        };
        match self.0.read(buf) {
            Ok(0) => Ok(None),
            Ok(_len) => Ok(Some(info)),
            Err(err) => Err(err),
        }
    }
}

pub fn find(path: &str) -> Result<(usize, File)> {
    let wpath = wstr(path);

    for (i, fs) in FileSystem::all().iter_mut().enumerate() {
        // Errors are ignored as they may not be related to opening the matching file
        if let Ok(mut root) = fs.root() {
            if let Ok(file) = root.open(&wpath) {
                return Ok((i, file));
            }
        }
    }

    // If no matching file found (or it failed to open), return NotFound
    Err(Error::NotFound)
}

pub fn load(path: &str) -> Result<Vec<u8>> {
    let (_i, mut file) = find(path)?;

    let mut data = vec![];
    let _count = file.read_to_end(&mut data)?;

    Ok(data)
}