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//! Implements web server.

use crate::core::persistence::*;
use crate::prelude::*;
use crate::settings::Settings;
use crate::templates;
use rouille::{router, Response};
use std::net::{IpAddr, Ipv4Addr, SocketAddr};
use std::sync::{Arc, Mutex};

const FAVICON: &[u8] = include_bytes!("statics/favicon.ico");
const FAVICON_16: &[u8] = include_bytes!("statics/favicon-16x16.png");
const FAVICON_32: &[u8] = include_bytes!("statics/favicon-32x32.png");
const APPLE_TOUCH_ICON: &[u8] = include_bytes!("statics/apple-touch-icon.png");
const ANDROID_CHROME_192: &[u8] = include_bytes!("statics/android-chrome-192x192.png");
const ANDROID_CHROME_512: &[u8] = include_bytes!("statics/android-chrome-512x512.png");

/// Start the web application.
pub fn start_server(settings: Settings, db: Arc<Mutex<Connection>>) -> ! {
    rouille::start_server(
        SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), settings.http_port),
        move |request| {
            router!(request,
                (GET) ["/"] => index(&db),
                (GET) ["/sensors/{sensor_id}", sensor_id: String] => get_sensor(&db, &sensor_id),
                (GET) ["/sensors/{sensor_id}/json", sensor_id: String] => get_sensor_json(&db, &sensor_id),
                (GET) ["/favicon.ico"] => Response::from_data("image/x-icon", FAVICON.to_vec()),
                (GET) ["/apple-touch-icon.png"] => Response::from_data("image/png", APPLE_TOUCH_ICON.to_vec()),
                (GET) ["/favicon-32x32.png"] => Response::from_data("image/png", FAVICON_32.to_vec()),
                (GET) ["/favicon-16x16.png"] => Response::from_data("image/png", FAVICON_16.to_vec()),
                (GET) ["/android-chrome-192x192.png"] => Response::from_data("image/png", ANDROID_CHROME_192.to_vec()),
                (GET) ["/android-chrome-512x512.png"] => Response::from_data("image/png", ANDROID_CHROME_512.to_vec()),
                _ => Response::empty_404(),
            )
        },
    )
}

/// Get index page response.
fn index(db: &Arc<Mutex<Connection>>) -> Response {
    Response::html(templates::Index::new(select_actuals(&db.lock().unwrap()).unwrap()).to_string())
}

/// Get sensor page response.
fn get_sensor(db: &Arc<Mutex<Connection>>, sensor_id: &str) -> Response {
    // FIXME: `unwrap()`s.
    let reading = select_last_reading(&db.lock().unwrap(), &sensor_id).unwrap();
    match reading {
        // TODO: read sensor instance.
        Some(reading) => Response::html(templates::Sensor::new(sensor_id, reading).to_string()),
        None => Response::empty_404(),
    }
}

/// Get last sensor value JSON response.
fn get_sensor_json(db: &Arc<Mutex<Connection>>, sensor_id: &str) -> Response {
    match select_last_reading(&db.lock().unwrap(), &sensor_id).unwrap() {
        Some(reading) => Response::json(&reading),
        None => Response::empty_404(),
    }
}