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

use embedder_traits::resources::{self, Resource, ResourceReaderMethods};
use servo_config::opts::{default_opts, set_options, Opts};

/// Configuration of Verso instance.
#[derive(Clone, Debug)]
pub struct Config {
    /// Global flag options of Servo.
    pub opts: Opts,
    /// Path to resources directory.
    pub resource_dir: PathBuf,
}

impl Config {
    /// Create a new configuration for creating Verso instance. It must provide the path of
    /// resources directory.
    pub fn new(resource_dir: PathBuf) -> Self {
        let opts = default_opts();
        Self { opts, resource_dir }
    }

    /// Init options and preferences.
    pub fn init(self) {
        // Set the resource files and preferences of Servo.
        resources::set(Box::new(ResourceReader(self.resource_dir)));

        // Set the global options of Servo.
        set_options(self.opts);
    }
}

struct ResourceReader(PathBuf);

impl ResourceReaderMethods for ResourceReader {
    fn read(&self, file: Resource) -> Vec<u8> {
        let path = self.0.join(file.filename());
        fs::read(path).expect("Can't read file")
    }

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

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