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use super::Directory;
use crate::files::pages::render_server_page;
use actix_web::{dev::ServiceResponse, HttpRequest, HttpResponse};
use handlebars::Handlebars;
use indoc::indoc;
use percent_encoding::{utf8_percent_encode, CONTROLS};
use serde_json::json;
use std::{io, path::Path};

/// A directory listing renderer.
pub type ListingRenderer =
  dyn Fn(&Directory, &HttpRequest) -> Result<ServiceResponse, io::Error> + Sync + Send;

const LIST_TEMPLATE: &str = indoc! {"
  <ul>
    {{#each entries}}
    <li><a href={{url}}>{{name}}</a></li>
    {{/each}}
  </ul>
"};

/// A default implementation of a `ListingRenderer`.
pub fn default_listing_renderer(
  dir: &Directory,
  req: &HttpRequest,
) -> Result<ServiceResponse, io::Error> {
  let index_of = format!("Index of {}", req.path());
  let base = Path::new(req.path());

  let title = match base.file_name() {
    Some(filename) => filename.to_string_lossy().into_owned(),
    None => String::from("/"),
  };

  let mut entries = vec![];

  for entry in dir.path.read_dir()? {
    if dir.is_visible(&entry) {
      let entry = entry.unwrap();
      let p = match entry.path().strip_prefix(&dir.path) {
        Ok(p) if cfg!(windows) => base.join(p).to_string_lossy().replace('\\', "/"),
        Ok(p) => base.join(p).to_string_lossy().into_owned(),
        Err(_) => continue,
      };

      // if file is a directory, add '/' to the end of the name
      if let Ok(metadata) = entry.metadata() {
        if metadata.is_dir() {
          entries.push(json!({
            "url": utf8_percent_encode(&p, CONTROLS).to_string(),
            "name": format!("{}/", entry.file_name().to_string_lossy()),
          }));
        } else {
          entries.push(json!({
            "url": utf8_percent_encode(&p, CONTROLS).to_string(),
            "name": entry.file_name().to_string_lossy(),
          }));
        }
      } else {
        continue;
      }
    }
  }

  let reg = Handlebars::new();

  let body = reg
    .render_template(
      LIST_TEMPLATE,
      &json!({
        "entries": entries,
      }),
    )
    .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;

  let html = render_server_page(&title, &index_of, &body)
    .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;

  Ok(ServiceResponse::new(
    req.clone(),
    HttpResponse::Ok()
      .content_type("text/html; charset=utf-8")
      .body(html),
  ))
}