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

use log::debug;
use serde::{Deserialize, Serialize};
use ureq::http::StatusCode;

use super::{Alias, FileUploading, Share, SharryAlias};

#[derive(Debug, Clone, Hash, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct FileChecked {
    path: PathBuf,
}

impl FileChecked {
    pub fn new(value: impl AsRef<Path>) -> io::Result<Self> {
        let meta = fs::metadata(&value)?;
        if meta.is_file() {
            Ok(Self {
                path: fs::canonicalize(&value)?,
            })
        } else {
            Err(io::Error::new(
                ErrorKind::InvalidInput,
                "Not a regular file",
            ))
        }
    }

    pub fn start_upload(
        self,
        http: &ureq::Agent,
        alias: &Alias,
        share: &Share,
    ) -> io::Result<FileUploading> {
        let size = usize::try_from(fs::metadata(&self.path)?.len()).map_err(io::Error::other)?;

        let res = {
            let endpoint = alias.get_endpoint(format!("alias/upload/{}/files/tus", share.id));

            let name = (self.path.file_name().and_then(OsStr::to_str))
                .ok_or_else(|| io::Error::new(ErrorKind::NotFound, "bad file name"))?
                .to_string();

            (http.post(endpoint))
                .sharry_header(alias)
                .header("Sharry-File-Name", &name)
                .header("Upload-Length", size)
                .send_empty()
                .map_err(io::Error::other)?
        };

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

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

        debug!("patch uri: {location}");

        Ok(FileUploading::new(self.path, size, location))
    }
}