/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use std::path::PathBuf;
use std::{env, fs};

use servo::resources::{self, Resource};

struct ResourceReader {
    resources_dir: PathBuf,
}

pub fn init() {
    resources::set(Box::new(ResourceReader {
        resources_dir: ancestor_dir_path("resources"),
    }));
}

pub(crate) fn ancestor_dir_path(needle: &str) -> PathBuf {
    // Try ./resources relative to the directory containing the
    // canonicalised executable path, then each of its ancestors.
    let mut path = env::current_exe().unwrap().canonicalize().unwrap();
    while path.pop() {
        path.push(needle);
        if path.is_dir() {
            return path.clone();
        }
        path.pop();
    }

    panic!("Could not find {needle} directory");
}

impl resources::ResourceReaderMethods for ResourceReader {
    fn read(&self, file: Resource) -> Vec<u8> {
        let mut path = self.resources_dir.clone();
        path.push(file.filename());
        fs::read(path).expect("Can't read file")
    }

    fn sandbox_access_files_dirs(&self) -> Vec<PathBuf> {
        vec![self.resources_dir.clone()]
    }

    fn sandbox_access_files(&self) -> Vec<PathBuf> {
        vec![]
    }
}