use std::{
    ffi::OsStr,
    fs,
    io::{self, Read},
    path::{Path, PathBuf},
};

use log::debug;
use ureq::http::StatusCode;

use super::{
    alias::{Alias, SharryAlias},
    share::Share,
};

#[derive(Debug)]
pub struct File<'t> {
    alias: &'t Alias,
    file_path: PathBuf,
    patch_uri: String,
}

impl<'t> File<'t> {
    pub fn create(
        http: &ureq::Agent,
        share: &'t Share,
        file_path: PathBuf,
    ) -> Result<Self, ureq::Error> {
        let endpoint = share
            .alias
            .get_endpoint(format!("alias/upload/{}/files/tus", share.id));

        let filename = file_path
            .file_name()
            .and_then(OsStr::to_str)
            .unwrap_or("file.bin");

        let res = http
            .post(endpoint)
            .sharry_header(share.alias)
            .header("Sharry-File-Name", filename)
            .header("Upload-Length", fs::metadata(&file_path)?.len())
            .send_empty()?;

        if res.status() != StatusCode::CREATED {
            return Err(ureq::Error::Other("unexpected response status".into()));
        }

        let location = res
            .headers()
            .get("Location")
            .ok_or_else(|| ureq::Error::Other("Location header not found".into()))?
            .to_str()
            .map_err(|_| ureq::Error::Other("Location header invalid".into()))?;

        debug!("location: {}", location);

        // let start = 10;
        // let count = 10;

        // let mut f = File::open(path)?;
        // f.seek(SeekFrom::Start(0));
        // let mut buf = vec![0; count];
        // f.read_exact(&mut buf)?;

        Ok(Self {
            alias: share.alias,
            file_path,
            patch_uri: location.into(),
        })
    }

    pub fn upload(&self, chunk_size: usize) -> UploadChunk {
        UploadChunk::new(&self.file_path, chunk_size).unwrap()
    }
}

pub struct UploadChunk {
    num: u64,
    f: fs::File,
    buffer: Vec<u8>,
}

impl UploadChunk {
    fn new(path: impl AsRef<Path>, chunk_size: usize) -> io::Result<Self> {
        Ok(Self {
            num: 0,
            f: fs::File::open(path)?,
            buffer: vec![0; chunk_size],
        })
    }
}