use std::collections::HashMap;
use std::net::SocketAddr;
use std::ops::DerefMut;
use std::rc::Rc;

use godot::classes::{Engine, IPanel, Panel, RichTextLabel, ScrollContainer, TextEdit};
use godot::prelude::*;
use godot::tools::get_autoload_by_name;

pub enum CliColor {
    Command,
    Info,
    Help,
    Error,
}

impl CliColor {
    pub fn as_str(&self) -> &str {
        match self {
            CliColor::Command => "#a2a2a2",
            CliColor::Info => "#fff",
            CliColor::Help => "#ffdc2e",
            CliColor::Error => "#cc3535",
        }
    }
}

pub const CLI_GLOBAL_NAME: &str = "CommandLinePanelGlobal";

#[derive(GodotClass)]
#[class(base=Panel)]
pub struct CommandLinePanel {
    #[export]
    pub input_field: Option<Gd<TextEdit>>,
    #[export]
    pub text_field: Option<Gd<RichTextLabel>>,
    #[export]
    pub scroll_container: Option<Gd<ScrollContainer>>,

    scroll_next_update: bool,
    commands: HashMap<String, Rc<Box<dyn Command>>>,

    base: Base<Panel>,
}

#[godot_api]
impl IPanel for CommandLinePanel {
    fn init(base: Base<Panel>) -> Self {
        let mut commands: HashMap<String, Rc<Box<dyn Command>>> = HashMap::new();
        commands.insert("help".to_owned(), Rc::new(Box::new(HelpCommand)));
        commands.insert("host".to_string(), Rc::new(Box::new(HostCommand)));
        commands.insert("join".to_string(), Rc::new(Box::new(JoinCommand)));
        commands.insert(
            "disconnect".to_string(),
            Rc::new(Box::new(DisconnectCommand)),
        );

        CommandLinePanel {
            input_field: None,
            text_field: None,
            scroll_container: None,
            scroll_next_update: false,
            commands,
            base,
        }
    }

    fn process(&mut self, _delta: f64) {
        if let Some(scroll) = &mut self.scroll_container
            && self.scroll_next_update
        {
            scroll.set_v_scroll(i32::MAX);
            self.scroll_next_update = false;
        }

        if let Some(input) = self.input_field.clone() {
            let text = input.get_text();
            if text.contains("\n") {
                let parts = text.split("\n");
                let first = parts.get(0).unwrap();
                self.input_command(first.to_string());
            }
        }
    }
}

#[godot_api]
impl CommandLinePanel {
    #[signal]
    pub fn on_host(port: u16);
    #[signal]
    pub fn on_join(port: String);
    #[signal]
    pub fn on_disconnect();

    pub fn singleton() -> Gd<CommandLinePanel> {
        get_autoload_by_name::<CommandLinePanel>(CLI_GLOBAL_NAME)
    }

    pub fn input_command(&mut self, command: String) {
        self.publish_message(format!("> {}", command), CliColor::Command);
        if let Some(input) = &mut self.input_field {
            input.clear();
        }
        self.handle_command(&command);
    }

    pub fn publish_message(&mut self, message: String, color: CliColor) {
        if let Some(field) = &mut self.text_field {
            if !field.get_parsed_text().is_empty() {
                field.append_text("\n");
            }
            field.append_text(&format!("[color={}]", color.as_str()));
            field.append_text(&message);
            field.append_text("[/color]");
            self.scroll_next_update = true;
        }
    }

    fn handle_command(&mut self, text: &String) {
        let mut command_and_params = text.split(" ").into_iter();
        let command = command_and_params.next().clone().unwrap_or("");
        let params = command_and_params.collect::<Vec<_>>();
        if let Some(command) = self.commands.get(command) {
            command.clone().execute(self, &params);
        } else {
            self.publish_message(format!("Unknown command: {}", command), CliColor::Info);
        }
    }
}

trait Command {
    fn execute(&self, cli: &mut CommandLinePanel, params: &[&str]);
    fn help(&self) -> &str;
}

#[derive(Clone)]
struct HelpCommand;
impl Command for HelpCommand {
    fn execute(&self, cli: &mut CommandLinePanel, params: &[&str]) {
        if let Some(command_name) = params.first() {
            if let Some(command) = cli.commands.get(*command_name) {
                cli.publish_message(command.help().to_string(), CliColor::Help);
            } else {
                cli.publish_message(format!("Unknown command: {}", command_name), CliColor::Help);
            }
        } else {
            let mut keys = cli.commands.keys().cloned().collect::<Vec<_>>();
            keys.sort();
            for key in keys {
                cli.publish_message(
                    format!("\t- {}: {}", key, cli.commands.get(&key).unwrap().help()),
                    CliColor::Help,
                );
            }
        }
    }

    fn help(&self) -> &str {
        "Shows this message"
    }
}
#[derive(Clone)]
struct HostCommand;
impl Command for HostCommand {
    fn execute(&self, cli: &mut CommandLinePanel, params: &[&str]) {
        if let Some(port_str) = params.first() {
            if let Ok(port) = u16::from_str_radix(*port_str, 10) {
                cli.signals().on_host().emit(port);
            } else {
                cli.publish_message(format!("Invalid port: {}", port_str), CliColor::Error);
            }
        } else {
            cli.publish_message(format!("Missing port"), CliColor::Error);
            cli.publish_message(format!("Usage: host [port]"), CliColor::Help);
        }
    }

    fn help(&self) -> &str {
        "Hosts a server at a given port"
    }
}
#[derive(Clone)]
struct JoinCommand;
impl Command for JoinCommand {
    fn execute(&self, cli: &mut CommandLinePanel, params: &[&str]) {
        if let Some(address_str) = params.first() {
            if let Ok(_) = address_str.parse::<SocketAddr>() {
                cli.signals().on_join().emit(address_str.to_string());
            } else {
                cli.publish_message(format!("Invalid address: {}", address_str), CliColor::Error);
            }
        } else {
            cli.publish_message(format!("Missing address"), CliColor::Error);
            cli.publish_message(format!("Usage: join [address]:[port]"), CliColor::Help);
        }
    }

    fn help(&self) -> &str {
        "Joins server at a given address:port"
    }
}

#[derive(Clone)]
struct DisconnectCommand;
impl Command for DisconnectCommand {
    fn execute(&self, cli: &mut CommandLinePanel, _params: &[&str]) {
        cli.signals().on_disconnect().emit();
    }

    fn help(&self) -> &str {
        "Disconnects from the server, or stops hosting the server"
    }
}