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use crate::error::Error;
use crate::taskdef::{FromTaskArg, IntoTaskArg, TaskArg};
use std::fs;
/**
 Binary Large Objects

**/
use std::io::{self, Read, Seek, Write};
use std::path::{Path, PathBuf};

pub struct Blob(PathBuf);
pub struct Output(pub(crate) PathBuf);

impl Blob {
    pub fn from_output(output: Output) -> Self {
        Blob(output.0)
    }

    pub fn open(&self) -> io::Result<impl Read + Seek> {
        let path = em_canonicalize(&self.0)?;
        fs::OpenOptions::new().read(true).open(&path)
    }
}

impl Output {
    pub fn open(&self) -> io::Result<impl Write + Seek> {
        let path = em_canonicalize(&self.0)?;
        fs::OpenOptions::new()
            .create(true)
            .truncate(true)
            .write(true)
            .open(&path)
    }

    #[inline]
    pub fn into_blob(self) -> Blob {
        Blob::from_output(self)
    }

    pub fn file(self, path: &Path) -> Result<Blob, Error> {
        let mut inf = fs::OpenOptions::new().read(true).open(path)?;
        let mut outf = self.open()?;

        io::copy(&mut inf, &mut outf)?;
        Ok(Blob::from_output(self))
    }

    pub fn bytes(self, data: impl AsRef<[u8]>) -> Result<Blob, Error> {
        let data = data.as_ref();
        self.open()?.write_all(data)?;
        Ok(Blob::from_output(self))
    }
}

impl IntoTaskArg for Blob {
    fn into_arg(self, base: &Path) -> Result<TaskArg, Error> {
        let cpath = em_canonicalize(&self.0)?;
        let path = cpath.strip_prefix(base)?;
        path.to_str()
            .ok_or_else(|| Error::invalid_path(&self.0))
            .map(|v| TaskArg::Blob(v.replace('\\', "/")))
    }
}

#[cfg(target_arch = "wasm32")]
fn em_canonicalize(path: &Path) -> io::Result<PathBuf> {
    use std::path::Component;

    let mut out_path = PathBuf::new();

    for c in path.components() {
        match c {
            Component::ParentDir => {
                let _ = out_path.pop();
            }
            Component::Normal(v) => out_path.push(v),
            Component::RootDir => out_path.push("/"),
            _ => (),
        }
    }

    Ok(out_path)
}

#[cfg(not(target_arch = "wasm32"))]
fn em_canonicalize(path: &Path) -> io::Result<PathBuf> {
    path.canonicalize()
}

impl FromTaskArg for Blob {
    fn from_arg(arg: TaskArg, base: &Path) -> Result<Self, Error> {
        match arg {
            TaskArg::Blob(path) => Ok(Blob(base.join(path))),
            _ => Err(Error::BlobExpected),
        }
    }
}

impl IntoTaskArg for Output {
    fn into_arg(self, base: &Path) -> Result<TaskArg, Error> {
        let path = self.0.strip_prefix(base)?;
        path.to_str()
            .ok_or_else(|| Error::invalid_path(&self.0))
            .map(|v| TaskArg::Output(v.into()))
    }
}

impl FromTaskArg for Output {
    fn from_arg(arg: TaskArg, base: &Path) -> Result<Self, Error> {
        Ok(match arg {
            TaskArg::Output(path) => Output(PathBuf::from(&base.join(path))),
            _ => return Err(Error::OutputExpected),
        })
    }
}