extern crate inputbot;

use std::{
    net::{SocketAddrV4, UdpSocket},
    str::FromStr,
};

use inputbot::{get_keybd_key, KeybdKey, KeybdKey::*};
use rosc::OscPacket;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use toml;

// Configuration struct with mapping of OSC addresses to keyboard keys, and a general server configuration.
#[derive(Deserialize, Serialize)]
struct Config {
    server: ServerConfig,
    // Mappings is called mapping in config for ease of use.
    #[serde(rename = "mapping")]
    mappings: Vec<EventKeyMapping>,
}
#[derive(Deserialize, Serialize)]
struct EventKeyMapping {
    event: String,
    key: String,
}
#[derive(Deserialize, Serialize)]
struct ServerConfig {
    port: u16,
}

fn main() {
    let config = match load_config() {
        Ok(c) => c,
        Err(e) => {
            println!("Error loading config file: {}", e);
            return;
        }
    };

    let mut event_key_map = HashMap::new();
    for mapping in config.mappings {
        // Convert the key string to a KeybdKey. First try to convert it to an F key, then to a normal key by matching the char.
        let key = match to_fkey(&mapping.key) {
            Some(k) => k,
            None => match mapping.key.chars().next() {
                Some(c) => get_keybd_key(c).unwrap(),
                None => {
                    println!("Invalid key: {}", mapping.key);
                    return;
                }
            },
        };
        event_key_map.insert(mapping.event, key);
    }

    println!("Starting OSC server on port {}...", config.server.port);
    let addr = match SocketAddrV4::from_str(format!("127.0.0.1:{}", config.server.port).as_str()) {
        Ok(addr) => addr,
        Err(_) => panic!("Unable to match address"),
    };
    let sock = UdpSocket::bind(addr).unwrap();
    println!("Listening to {}", addr);

    let mut buf = [0u8; rosc::decoder::MTU];

    loop {
        match sock.recv_from(&mut buf) {
            Ok((size, addr)) => {
                println!("Received packet with size {} from: {}", size, addr);
                let (_, packet) = rosc::decoder::decode_udp(&buf[..size]).unwrap();
                handle_packet(packet, &event_key_map);
            }
            Err(e) => {
                println!("Error receiving from socket: {}", e);
                break;
            }
        }
    }
}

fn load_config() -> Result<Config, String> {
    // If the config file isn't found, create one with default values
    if !std::path::Path::new("config.toml").exists() {
        let default_config = Config {
            server: ServerConfig { port: 9000 },
            mappings: vec![],
        };
        let toml = toml::to_string_pretty(&default_config).map_err(|e| e.to_string())?;
        std::fs::write("config.toml", toml).map_err(|e| e.to_string())?;
        println!("Created default config file at config.toml");
    }
    let config_file = std::fs::read_to_string("config.toml").map_err(|e| e.to_string())?;
    let config: Config = toml::from_str(&config_file).map_err(|e| e.to_string())?;
    Ok(config)
}

fn handle_packet(packet: OscPacket, mappings: &HashMap<String, KeybdKey>) {
    match packet {
        OscPacket::Message(msg) => {
            // Print message
            println!("OSC Message: {:?}", msg);
            // Print address
            println!("OSC Address: {}", msg.addr);
            // Match event to key
            let key = match mappings.get(&msg.addr) {
                Some(k) => k,
                None => {
                    return;
                }
            };
            // Press key
            println!("Pressing key: {:?}", key);
            key.press();
        }
        OscPacket::Bundle(bundle) => {
            println!("OSC Bundle: {:?}", bundle);
        }
    }
}

// Translate "F1", "F2", "F3" etc to corresponding KeybdKey.
// inputbot doesn't currently support this natively.
fn to_fkey(key: &String) -> Option<KeybdKey> {
    match key.as_str() {
        "F1" => Some(F1Key),
        "F2" => Some(F2Key),
        "F3" => Some(F3Key),
        "F4" => Some(F4Key),
        "F5" => Some(F5Key),
        "F6" => Some(F6Key),
        "F7" => Some(F7Key),
        "F8" => Some(F8Key),
        "F9" => Some(F9Key),
        "F10" => Some(F10Key),
        "F11" => Some(F11Key),
        "F12" => Some(F12Key),
        "F13" => Some(F13Key),
        "F14" => Some(F14Key),
        "F15" => Some(F15Key),
        "F16" => Some(F16Key),
        "F17" => Some(F17Key),
        "F18" => Some(F18Key),
        "F19" => Some(F19Key),
        "F20" => Some(F20Key),
        "F21" => Some(F21Key),
        "F22" => Some(F22Key),
        "F23" => Some(F23Key),
        "F24" => Some(F24Key),
        _ => None,
    }
}

mod tests {
    // Test to_fkey
    #[test]
    fn test_to_fkey() {
        assert_eq!(super::to_fkey(&"F1".to_string()), Some(super::F1Key));
        assert_eq!(super::to_fkey(&"F2".to_string()), Some(super::F2Key));
        assert_eq!(super::to_fkey(&"F3".to_string()), Some(super::F3Key));
        assert_eq!(super::to_fkey(&"F4".to_string()), Some(super::F4Key));
        assert_eq!(super::to_fkey(&"F5".to_string()), Some(super::F5Key));
        assert_eq!(super::to_fkey(&"F6".to_string()), Some(super::F6Key));
        assert_eq!(super::to_fkey(&"F7".to_string()), Some(super::F7Key));
        assert_eq!(super::to_fkey(&"F8".to_string()), Some(super::F8Key));
        assert_eq!(super::to_fkey(&"F9".to_string()), Some(super::F9Key));
        assert_eq!(super::to_fkey(&"F10".to_string()), Some(super::F10Key));
        assert_eq!(super::to_fkey(&"F11".to_string()), Some(super::F11Key));
        assert_eq!(super::to_fkey(&"F12".to_string()), Some(super::F12Key));
        assert_eq!(super::to_fkey(&"F13".to_string()), Some(super::F13Key));
        assert_eq!(super::to_fkey(&"F14".to_string()), Some(super::F14Key));
        assert_eq!(super::to_fkey(&"F15".to_string()), Some(super::F15Key));
        assert_eq!(super::to_fkey(&"F16".to_string()), Some(super::F16Key));
        assert_eq!(super::to_fkey(&"F17".to_string()), Some(super::F17Key));
        assert_eq!(super::to_fkey(&"F18".to_string()), Some(super::F18Key));
        assert_eq!(super::to_fkey(&"F19".to_string()), Some(super::F19Key));
        assert_eq!(super::to_fkey(&"F20".to_string()), Some(super::F20Key));
        assert_eq!(super::to_fkey(&"F21".to_string()), Some(super::F21Key));
        assert_eq!(super::to_fkey(&"F22".to_string()), Some(super::F22Key));
        assert_eq!(super::to_fkey(&"F23".to_string()), Some(super::F23Key));
        assert_eq!(super::to_fkey(&"F24".to_string()), Some(super::F24Key));
        assert_eq!(super::to_fkey(&"F25".to_string()), None);
    }
}