#![windows_subsystem = "windows"]

use gio::prelude::*;
use gtk::prelude::*;
use gtk::Orientation;
use rodio::{Sink, Source};
use serde_derive::{Serialize, Deserialize};
use std::env::args;
use std::fs::File;
use std::io::{BufReader, Write, Read};
use std::path::PathBuf;
use std::process::Command;

const SPACING: i32 = 16;

#[derive(Debug, Eq, PartialEq, Serialize, Deserialize)]
struct Config {
    position: (i32, i32),
    size:     (i32, i32),
}

fn save_config(config: Config) {
    let mut config_path = dirs::config_dir()
        .expect("Couldn't find user config directory");

    config_path.push("ruin");
    config_path.push("lull");

    if !config_path.exists() {
        std::fs::create_dir_all(&config_path)
            .expect("Couldn't create lull config directory");
    }

    let toml = toml::to_string(&config)
        .expect("Couldn't convert config to toml");

    config_path.push("lull.toml");

    let mut config_file = File::create(config_path)
        .expect("Couldn't create config file");

    config_file.write(&toml.into_bytes())
        .expect("Couldn't write config file");
}

fn load_config() -> Option<Config> {
    let mut config_path = dirs::config_dir()
        .expect("Couldn't find user config directory");

    config_path.push("ruin");
    config_path.push("lull");
    config_path.push("lull.toml");

    let file = File::open(config_path);

    if file.is_err() {
        return None;
    }

    let mut toml = String::new();

    file.unwrap().read_to_string(&mut toml)
        .expect("Couldn't read config file");

    let config = toml::from_str(&toml)
        .expect("Couldn't parse config");

    Some(config)
}

#[cfg(target_os = "windows")]
fn file_manager() -> &'static str {
    "explorer"
}

#[cfg(not(target_os = "windows"))]
fn file_manager() -> &'static str {
    "xdg-open"
}

fn error_popup(message: &str) {
    let popup = gtk::Window::new(gtk::WindowType::Toplevel);
    popup.set_title("error");
    popup.set_border_width(SPACING as u32);
    popup.set_position(gtk::WindowPosition::Center);
    popup.set_default_size(256, 64);
    popup.set_type_hint(gdk::WindowTypeHint::Dialog);
    popup.set_resizable(false);

    let message = gtk::Label::new(Some(message));
    popup.add(&message);

    popup.show_all();
}

fn get_sounds_dir() -> PathBuf {
    let mut data_dir = dirs::data_dir().expect("Couldn't find user data directory");

    data_dir.push("ruin");
    data_dir.push("lull");

    if !data_dir.exists() {
        std::fs::create_dir_all(&data_dir).expect("Couldn't create lull data directory");
    }

    data_dir
}

fn build_ui(application: &gtk::Application) {
    let window = gtk::ApplicationWindow::new(application);

    window.set_title("lull");
    window.set_border_width(SPACING as u32);
    window.set_position(gtk::WindowPosition::Center);
    window.set_default_size(256, 128);

    if let Some(config) = load_config() {
        window.move_(config.position.0, config.position.1);
        window.resize(config.size.0, config.size.1);
    }

    let button_manage_sounds = gtk::Button::with_label("manage sounds");

    button_manage_sounds.connect_clicked(|_| {
        let mut file_manager = Command::new(file_manager());
        file_manager.arg(get_sounds_dir());
        file_manager.output().unwrap();
    });

    let sounds_manage  = gtk::Box::new(Orientation::Vertical,   SPACING);
    let columns        = gtk::Box::new(Orientation::Horizontal, SPACING);
    let column_labels  = gtk::Box::new(Orientation::Vertical,   SPACING);
    let column_sliders = gtk::Box::new(Orientation::Vertical,   SPACING);

    columns.set_homogeneous(false);
    column_labels.set_homogeneous(true);
    column_sliders.set_homogeneous(true);
    column_labels.set_property_expand(false);
    column_sliders.set_property_expand(true);
    column_sliders.set_property_width_request(128);

    window.add(&sounds_manage);
    sounds_manage.add(&columns);
    sounds_manage.add(&button_manage_sounds);
    columns.add(&column_labels);
    columns.add(&column_sliders);

    let device = rodio::default_output_device().unwrap();

    let mut paths = std::fs::read_dir(get_sounds_dir())
        .expect("Couldn't read lull sounds directory")
        .map(|res| res.map(|e| e.path()))
        .collect::<Result<Vec<_>, std::io::Error>>()
        .expect("Couldn't read files from lull sounds directory");

    paths.sort();

    for path in paths {
        let name: &str = path.file_stem().unwrap().to_str().unwrap();

        let file = File::open(&path)
            .expect("Couldn't open audio file");

        let source = rodio::Decoder::new(
            BufReader::new(file)
        );

        if source.is_err() {
            error_popup(&format!(
                "Couldn't parse file {}. \n{}.",
                path.to_str().unwrap(),
                source.err().unwrap()
            ));
            continue;
        }

        let source = source.unwrap().repeat_infinite();

        let sink = Sink::new(&device);
        sink.append(source);
        sink.pause();

        let label = gtk::Label::new(Some(name));
        label.set_halign(gtk::Align::End);
        column_labels.add(&label);

        let adjustment = gtk::Adjustment::new(
            0.0,
            0.0,
            1.0,
            0.0,
            0.0,
            0.0
        );

        let slider = gtk::Scale::new(
            Orientation::Horizontal,
            Some(&adjustment)
        );

        slider.set_draw_value(false);

        slider.connect_value_changed(move |scale| {
            let volume = scale.get_value();

            if volume == 0. {
                sink.pause();
            } else {
                sink.play();
                sink.set_volume(volume as f32);
            }
        });

        column_sliders.add(&slider);
    }

    window.show_all();

    window.connect_delete_event(|window, _event| {
        save_config(Config {
            position: window.get_position(),
            size:     window.get_size()
        });

        Inhibit(false)
    });
}

fn main() {
    let application = gtk::Application::new(
        Some("dev.tinybird.max.lull"),
        Default::default()
    ).expect("Initialization failed...");

    application.connect_activate(|app| {
        build_ui(app);
    });

    application.run(&args().collect::<Vec<_>>());
}