extern crate getopts;
extern crate pencil;
extern crate modelthing;
extern crate env_logger;
extern crate pulldown_cmark;

#[macro_use]
extern crate log;

use std::env;
use std::collections::BTreeMap;
use std::path::Path;
use getopts::Options;
use pencil::Pencil;
use pencil::{Request, PencilResult, Response, HTTPError, PencilError};

/*
This command doesn't use error_chain (or raise errors in general) because the
web framework handles panics as 500 errors automatically.
*/


fn home(r: &mut Request) -> PencilResult {
    let context: BTreeMap<String,String> = BTreeMap::new();
    return r.app.render_template("home.html", &context);
}

fn readme(r: &mut Request) -> PencilResult {
    let mut context = BTreeMap::new();
    let raw_text = include_str!("../../README.txt");
    context.insert("raw_text".to_string(), raw_text.to_string());
    return r.app.render_template("raw.html", &context);
}

fn model_list(r: &mut Request) -> PencilResult {
    let namespace = r.view_args.get("namespace").unwrap();
    let paths = modelthing::search_models(Path::new(namespace));
    let l: Vec<Vec<String>> = paths.iter()
                              .map(|x| vec![namespace.to_string(),
                                            Path::new(x).strip_prefix(namespace)
                                                        .unwrap()
                                                        .to_string_lossy()
                                                        .to_string()
                                           ])
                              .collect();
    let mut context = BTreeMap::new();
    context.insert("model_slug_list".to_string(), l);
    return r.app.render_template("model_list.html", &context);
}

fn model_view(r: &mut Request) -> PencilResult {
    let namespace = r.view_args.get("namespace").unwrap();
    let model_slug = r.view_args.get("model_slug").unwrap();
    let model_path = Path::new(namespace).join(model_slug);
    match modelthing::load_model_entry(model_path.as_path()) {
        Ok(me) => {
            let mut markdown_html = String::new();
            let p = pulldown_cmark::Parser::new_ext(
                &me.markdown,
                pulldown_cmark::Options::empty());
            pulldown_cmark::html::push_html(&mut markdown_html, p);
            let mut context = BTreeMap::new();
            context.insert("namespace".to_string(), namespace.to_string());
            context.insert("model_slug".to_string(), model_slug.to_string());
            context.insert("model_name".to_string(), me.ast.name.clone());
            context.insert("model_description".to_string(), me.ast.description.clone().unwrap_or("".to_string()));
            context.insert("markdown_html".to_string(), markdown_html);
            context.insert("markdown".to_string(), me.markdown.clone());
            context.insert("modelica".to_string(), format!("{:?}", me.ast));
            r.app.render_template("model_view.html", &context)
        },
        Err(_) => Err(PencilError::PenHTTPError(pencil::HTTPError::NotFound)),
    }
}

// Sends the modelica file
fn model_raw(r: &mut Request) -> PencilResult {
    let namespace = r.view_args.get("namespace").unwrap();
    let model_slug = r.view_args.get("model_slug").unwrap();
    let model_path = Path::new(namespace).join(model_slug).to_string_lossy().to_string();
    pencil::helpers::send_from_directory(&model_path, "model.modelica", true)
}

fn page_not_found(_: HTTPError) -> PencilResult {
    let mut response = Response::from("404: Not Found");
    response.status_code = 404;
    Ok(response)
}

fn server_error(_: HTTPError) -> PencilResult {
    let mut response = Response::from("500: Server Error");
    response.status_code = 500;
    Ok(response)
}

fn print_usage(opts: Options) {
    let brief = "usage:\tmt-webface [options]";
    println!("");
    print!("{}", opts.usage(&brief));
}

fn main() {

    let args: Vec<String> = env::args().collect();

    let mut opts = Options::new();
    opts.optflag("h", "help", "print this help menu");
    opts.optflag("b", "bind", "local IP:port to bind to");
    opts.optflag("", "version", "print the version");

    let matches = match opts.parse(&args[1..]) {
        Ok(m) => m,
        Err(f) => {
            println!("{}\n", f.to_string());
            print_usage(opts);
            ::std::process::exit(-1);
        }
    };

    if matches.opt_present("help") {
        print_usage(opts);
        return;
    }

    if matches.opt_present("version") {
        println!("modelthing {}", env!("CARGO_PKG_VERSION"));
        return;
    }

    env_logger::init().unwrap();

    let mut app = Pencil::new("webface");
    app.name = "modelthing-webface".to_string();
    app.set_debug(true);
    app.set_log_level();
    app.httperrorhandler(404, page_not_found);
    app.httperrorhandler(500, server_error);
    app.enable_static_file_handling();
    debug!("root_path: {}", app.root_path);

    app.register_template("base.html");
    app.register_template("home.html");
    app.register_template("raw.html");
    app.get("/", "home", home);
    app.get("/readme/", "readme", readme);
    app.register_template("model_list.html");
    app.get("/m/<namespace:string>/", "model_list", model_list);
    app.register_template("model_view.html");
    app.get("/m/<namespace:string>/<model_slug:string>/", "model_view", model_view);
    app.get("/m/<namespace:string>/<model_slug:string>/raw/", "model_raw", model_raw);

    let bind = matches.opt_str("bind").unwrap_or("127.0.0.1:5000".to_string());
    let bind_str: &str = &bind;
    info!("Running on {}", bind);
    app.run(bind_str);
}