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use std::{
    fs::read_dir,
    path::{Path, PathBuf},
    sync::Arc,
    time::Instant,
};

use rayon::prelude::*;
use stc_ts_module_loader::resolvers::node::NodeResolver;
use swc_common::FileName;

use crate::{loader::LoadModule, Checker};

impl<L> Checker<L>
where
    L: LoadModule,
{
    fn try_loading_typing_of_one_package(&self, dir: &Path) {
        if !dir.is_dir() {
            return;
        }

        let result = NodeResolver
            .resolve_as_file(dir)
            .or_else(|_| NodeResolver.resolve_as_directory(dir));

        if let Ok(entry) = result {
            let entry = Arc::new(FileName::Real(entry));
            let start = Instant::now();

            self.analyze_module(None, entry);

            let end = Instant::now();
            log::debug!("Loading typings at `{}` took {:?}", dir.display(), end - start);
        }
    }

    fn load_typings_from_dir(&self, dir: &Path, types: Option<&[String]>) {
        let types_dir = dir.join("node_modules").join("@types");

        if !types_dir.is_dir() {
            return Default::default();
        }

        let dirs = types.map(|s| s.iter().map(|s| PathBuf::from(s.clone())).collect()).or_else(|| {
            let pkgs = read_dir(&types_dir).ok()?;

            let f = pkgs.into_iter().filter_map(Result::ok).map(|e| e.path()).collect::<Vec<_>>();

            Some(f)
        });

        if let Some(dirs) = dirs {
            dirs.into_par_iter().for_each(|dir| {
                self.try_loading_typing_of_one_package(&types_dir.join(dir));
            });
        }
    }

    /// Load typings from node_modules.
    ///
    /// - https://www.typescriptlang.org/tsconfig#typeRoots
    /// - https://www.typescriptlang.org/tsconfig#types
    pub fn load_typings(&self, base: &Path, _type_roots: Option<&[PathBuf]>, types: Option<&[String]>) {
        let mut dirs = vec![];

        let mut cur = Some(base);
        while let Some(c) = cur {
            dirs.push(c.to_path_buf());
            cur = c.parent();
        }

        dirs.into_par_iter().for_each(|dir| {
            self.load_typings_from_dir(&dir, types);
        });
    }
}