use std::path::Path;
use std::fs::File;
use std::io::Read;


pub static INDEX: &'static [u8] = include_bytes!("index.hbs");
pub static CSS: &'static [u8] = include_bytes!("book.css");
pub static FAVICON: &'static [u8] = include_bytes!("favicon.png");
pub static JS: &'static [u8] = include_bytes!("book.js");
pub static HIGHLIGHT_JS: &'static [u8] = include_bytes!("highlight.js");
pub static TOMORROW_NIGHT_CSS: &'static [u8] = include_bytes!("tomorrow-night.css");
pub static HIGHLIGHT_CSS: &'static [u8] = include_bytes!("highlight.css");
pub static JQUERY: &'static [u8] = include_bytes!("jquery-2.1.4.min.js");
pub static FONT_AWESOME: &'static [u8] = include_bytes!("_FontAwesome/css/font-awesome.min.css");
pub static FONT_AWESOME_EOT: &'static [u8] = include_bytes!("_FontAwesome/fonts/fontawesome-webfont.eot");
pub static FONT_AWESOME_SVG: &'static [u8] = include_bytes!("_FontAwesome/fonts/fontawesome-webfont.svg");
pub static FONT_AWESOME_TTF: &'static [u8] = include_bytes!("_FontAwesome/fonts/fontawesome-webfont.ttf");
pub static FONT_AWESOME_WOFF: &'static [u8] = include_bytes!("_FontAwesome/fonts/fontawesome-webfont.woff");
pub static FONT_AWESOME_WOFF2: &'static [u8] = include_bytes!("_FontAwesome/fonts/fontawesome-webfont.woff2");
pub static FONT_AWESOME_OTF: &'static [u8] = include_bytes!("_FontAwesome/fonts/FontAwesome.otf");

/// The `Theme` struct should be used instead of the static variables because the `new()` method
/// will look if the user has a theme directory in his source folder and use the users theme instead
/// of the default.
///
/// You should exceptionnaly use the static variables only if you need the default theme even if the
/// user has specified another theme.
pub struct Theme {
    pub index: Vec<u8>,
    pub css: Vec<u8>,
    pub favicon: Vec<u8>,
    pub js: Vec<u8>,
    pub highlight_css: Vec<u8>,
    pub tomorrow_night_css: Vec<u8>,
    pub highlight_js: Vec<u8>,
    pub jquery: Vec<u8>,
}

impl Theme {
    pub fn new(src: &Path) -> Self {

        // Default theme
        let mut theme = Theme {
            index: INDEX.to_owned(),
            css: CSS.to_owned(),
            favicon: FAVICON.to_owned(),
            js: JS.to_owned(),
            highlight_css: HIGHLIGHT_CSS.to_owned(),
            tomorrow_night_css: TOMORROW_NIGHT_CSS.to_owned(),
            highlight_js: HIGHLIGHT_JS.to_owned(),
            jquery: JQUERY.to_owned(),
        };

        // Check if the given path exists
        if !src.exists() || !src.is_dir() {
            return theme
        }

        let src = src.join("theme");
        // If src does exist, check if there is a theme directory in it
        if !src.exists() || !src.is_dir() {
            return theme
        }

        // Check for individual files if they exist

        // index.hbs
        if let Ok(mut f) = File::open(&src.join("index.hbs")) {
            theme.index.clear(); // Reset the value, because read_to_string appends...
            let _ = f.read_to_end(&mut theme.index);
        }

        // book.js
        if let Ok(mut f) = File::open(&src.join("book.js")) {
            theme.js.clear();
            let _ =  f.read_to_end(&mut theme.js);
        }

        // book.css
        if let Ok(mut f) = File::open(&src.join("book.css")) {
            theme.css.clear();
            let _ = f.read_to_end(&mut theme.css);
        }

        // favicon.png
        if let Ok(mut f) = File::open(&src.join("favicon.png")) {
            theme.favicon.clear();
            let _ = f.read_to_end(&mut theme.favicon);
        }

        // highlight.js
        if let Ok(mut f) = File::open(&src.join("highlight.js")) {
            theme.highlight_js.clear();
            let _ = f.read_to_end(&mut theme.highlight_js);
        }

        // highlight.css
        if let Ok(mut f) = File::open(&src.join("highlight.css")) {
            theme.highlight_css.clear();
            let _ = f.read_to_end(&mut theme.highlight_css);
        }

        // tomorrow-night.css
        if let Ok(mut f) = File::open(&src.join("tomorrow-night.css")) {
            theme.tomorrow_night_css.clear();
            let _ = f.read_to_end(&mut theme.tomorrow_night_css);
        }

        theme
    }
}