use std::path::PathBuf;

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
pub struct Theme {
    pub name: String,
    pub description: String,

    #[serde(skip)]
    pub slug: String,
    #[serde(skip)]
    pub files: Vec<String>,
}

pub fn read_theme_from_dir(dir: PathBuf) -> Option<Theme> {
    if let Some((slug, mut theme)) = dir
        .file_name()
        .map(|dir_name| dir_name.to_string_lossy().to_string())
        .and_then(|slug| {
            std::fs::read_to_string(dir.join("theme.json"))
                .map(|theme_json| (slug, theme_json))
                .ok()
        })
        .and_then(|(slug, theme_json)| {
            serde_json::from_str::<Theme>(&theme_json)
                .ok()
                .map(|theme| (slug, theme))
        })
    {
        theme.slug = slug.clone();

        let files: Vec<_> = std::fs::read_dir(dir)
            .unwrap()
            .into_iter()
            .filter(|r| r.is_ok())
            .map(|r| r.unwrap())
            .map(|e| e.file_name().to_string_lossy().to_string())
            .filter(|n| n.ends_with(".css"))
            .collect();

        theme.files = files;

        return Some(theme);
    }

    None
}