extern crate reqwest;
extern crate serde_json;
extern crate cursive;
extern crate clap;
#[macro_use]
extern crate lazy_static;

use cursive::Cursive;
use cursive::traits::*;
use cursive::views::{ 
    TextView, Dialog, EditView,
    SelectView, OnEventView, LinearLayout,
    DummyView
};

use serde_json::Value;

use clap::{Arg, App};

pub mod content;
use content::*;

pub mod theme;
use theme::*;

struct Configuration {
    wiki_url: String
}

lazy_static! {
    static ref CONFIGURATION: Configuration = parse_arguments();
}

fn main() {
    parse_arguments();
    
    // Initial setup
    let mut main = Cursive::default();

    // Set theme
    main.set_theme(theme_gen());


    main.add_global_callback('q', |s| s.quit());
    main.add_global_callback('s', |s| search(s));

    main.run();
}

fn parse_arguments() -> Configuration {
    let matches = App::new("Taizen")
        .version("0.1.0")
        .author("NerdyPepper")
        .about("TUI MediaWiki browser")
        .arg(Arg::with_name("URL")
             .help("The URL of the wiki to be viewed")
             .index(1))
        .arg(Arg::with_name("lang")
             .short("l")
             .long("lang")
             .value_name("CODE")
             .help("Choose the language for Wikipedia")
             .takes_value(true))
        .get_matches();

    if matches.is_present("HELP") {
        std::process::exit(0);
    }
                               
    let lang = matches.value_of("lang").unwrap_or("en").to_string();
    let wiki_url = matches.value_of("URL").unwrap_or(&format!("https://{}.wikipedia.org", lang)).to_string();
    
    Configuration {
        wiki_url
    }
}

fn search(s: &mut Cursive) {

    fn go(s: &mut Cursive, search: &str) {
        s.pop_layer();
        let mut result = vec![];
        match get_search_results(&search) {
            Ok(x) => result = x,
            Err(e) => pop_error(s,handler(e)),
        };
        let choose_result = SelectView::<String>::new()
            .with_all_str(result)
            .on_submit(|s, name|{
                s.pop_layer();
                on_submit(s, name);
            });
        s.add_layer(Dialog::around(choose_result)
            .title("Search Results")
            .button("Cancel", |s| match s.pop_layer() { _ => () })
            .fixed_size(( 45,10 )));
    }

    s.add_layer(Dialog::around(EditView::new()
                               .on_submit(go)
                               .with_id("search")
                               )
                .title("Search for a page")
                .button("Go", |s| {
                    let search_txt = s.call_on_id( "search", |v: &mut EditView| {
                        v.get_content()
                    }).unwrap();
                    go(s, &search_txt);
                })
                .button("Cancel", |s| match s.pop_layer(){
                    _ => ()
                })
                .fixed_size(( 35, 5 )));
}

fn on_submit(s: &mut Cursive, name: &str) {
    // get article data
    let heading: String = name.to_string();
    let url = query_url_gen(&name.replace(" ", "_"));
    let mut extract = String::new();
    let mut link_vec: Vec<String> = vec![];

    let mut res = reqwest::get(&url).unwrap();
    let v: Value = match serde_json::from_str(&res.text().unwrap()) {
        Ok(x) => x,
        Err(x) => panic!("Failed to parse json\nReceived error {}", x),
    };

    match get_extract(&v) {
        Ok(x) => extract = x,
        Err(e) => pop_error(s, handler(e))
    };
    match get_links(&v) {
        Ok(x) => link_vec = x,
        Err(e) => pop_error(s, handler(e))
    };

    // get the act together
    let article_content = TextView::new(extract_formatter(extract)).scrollable();

    let links = SelectView::<String>::new()
        .with_all_str(link_vec)
        .on_submit(on_submit)
        .fixed_width(20);

    s.add_layer(
        Dialog::around(
            OnEventView::new(
                LinearLayout::horizontal()
                .child(article_content.fixed_width(72))
                .child(DummyView)
                .child(links)
                )
            .on_event('t', |s| match s.pop_layer() { _ => () })
            )
        .title(heading)
        );
}