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//██Let me play the world's tiniest piano for you. ██
//█▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀█
//█▙▙█▙▙▙█▙▙█▙▙▙█▙▙█▙▙▙█▙▙█▙▙▙█▙▙█▙▙▙█▙▙█▙▙▙█▙▙█▙▙▙██
//█▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄█
//███████████████████████████████████████████████████
//█                      ▀ ▀ ▀                      █
#![allow(unused)]
#![allow(clippy::unit_arg)]
#![feature(adt_const_params)]
#![feature(associated_type_defaults)]
#![feature(if_let_guard)]
#![feature(impl_trait_in_assoc_type)]
#![feature(type_alias_impl_trait)]
#![feature(trait_alias)]
#![feature(type_changing_struct_update)]
#![feature(let_chains)]
#![feature(closure_lifetime_binder)]
#![feature(generic_const_exprs)]
#![feature(generic_arg_infer)]
pub use ::tek_engine:: *;
pub use ::tek_device::{self, *};
pub use ::tengri::{Usually, Perhaps, Has, MaybeHas};
pub use ::tengri::{has, maybe_has};
pub use ::tengri::dsl::*;
pub use ::tengri::input::*;
pub use ::tengri::output::*;
pub use ::tengri::tui::*;
pub use ::tengri::tui::ratatui;
pub use ::tengri::tui::ratatui::prelude::buffer::Cell;
pub use ::tengri::tui::ratatui::prelude::Color::{self, *};
pub use ::tengri::tui::ratatui::prelude::{Style, Stylize, Buffer, Modifier};
pub use ::tengri::tui::crossterm;
pub use ::tengri::tui::crossterm::event::{Event, KeyCode::{self, *}};
use std::path::{Path, PathBuf};
use std::sync::{Arc, RwLock};
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering::Relaxed};
use std::error::Error;
use std::collections::BTreeMap;
use std::fmt::Write;
use ::tengri::tui::ratatui::prelude::Position;
use xdg::BaseDirectories;
mod app_view; pub use self::app_view::*;
mod app_ctrl; pub use self::app_ctrl::*;
mod app_jack; pub use self::app_jack::*;
#[cfg(test)] mod app_test;
/// Total state
#[derive(Default, Debug)]
pub struct App {
    /// Must not be dropped for the duration of the process
    pub jack:    Jack<'static>,
    /// Display size
    pub size:    Measure<TuiOut>,
    /// Performance counter
    pub perf:    PerfModel,
    /// Available view profiles and input bindings
    pub config:  Config,
    /// Currently selected profile
    pub profile: Profile,
    /// Contains the currently edited musical arrangement
    pub project: Arrangement,
    /// Contains all recently created clips.
    pub pool:    Pool,
    /// Undo history
    pub history: Vec<(AppCommand, Option<AppCommand>)>,
    /// Dialog overlay
    pub dialog:  Dialog,
    /// Base color.
    pub color:   ItemTheme,
}
type ModuleMap<T> = Arc<RwLock<BTreeMap<Arc<str>, T>>>;
/// Configuration
#[derive(Default, Debug)]
pub struct Config {
    /// XDG basedirs
    pub dirs: BaseDirectories,
    /// Available view profiles
    pub views: ModuleMap<Profile>,
    /// Available input bindings
    pub binds: ModuleMap<EventMap<Option<TuiEvent>, Arc<str>>>,
}
impl Config {
    const VIEWS: &'static str = "views.edn";
    const BINDS: &'static str = "binds.edn";
    const DEFAULT_VIEWS: &'static str = include_str!("../../config/views.edn");
    const DEFAULT_BINDS: &'static str = include_str!("../../config/binds.edn");
    pub fn init () -> Usually<Self> {
        let mut cfgs: Self = Default::default();
        cfgs.dirs = BaseDirectories::with_profile("tek", "v0");
        cfgs.load(Self::VIEWS, Self::DEFAULT_VIEWS, |cfgs, dsl|cfgs.load_view(dsl))?;
        cfgs.load(Self::BINDS, Self::DEFAULT_BINDS, |cfgs, dsl|cfgs.load_bind(dsl))?;
        println!("{cfgs:#?}");
        Ok(cfgs)
    }
    pub fn load (
        &mut self, path: &str, defaults: &str, mut each: impl FnMut(&mut Self, &str)->Usually<()>
    ) -> Usually<()> {
        if self.dirs.find_config_file(path).is_none() {
            println!("init: {path}");
            std::fs::write(self.dirs.place_config_file(path)?, defaults);
        }
        Ok(if let Some(path) = self.dirs.find_config_file(path) {
            let src = std::fs::read_to_string(&path)?;
            src.as_str().each(move|item|each(self, item))?;
        } else {
            return Err(format!("{path}: not found").into())
        })
    }
    pub fn load_view <D: Dsl> (&mut self, dsl: D) -> Usually<()> {
        load_mod(dsl, |id, tail|Ok(self.views.write().unwrap().insert(id.into(),
            Profile::from_dsl(tail)?)))
    }
    pub fn load_bind <D: Dsl> (&mut self, dsl: D) -> Usually<()> {
        load_mod(dsl, |id, tail|Ok(self.binds.write().unwrap().insert(id.into(), {
            let mut map = EventMap::new();
            tail.each(|item|{
                println!("{item:?}");
                map.add(TuiEvent::from_dsl(item.exp()?.head()?)?, Binding {
                    command:     item.exp()?.tail()?.unwrap_or_default().into(),
                    condition:   None,
                    description: None,
                    source:      None
                });
                Ok(())
            })?;
            map
        })))
    }
}
fn load_mod <D: Dsl, U> (dsl: D, cb: impl Fn(&str, &str)->Usually<U>) -> Usually<()> {
    //dsl!(dsl|module :id ..body|dsl!(body|@bind #info? ..commands|)
    if let Some(exp)  = dsl.exp()?
    && Some("module") == exp.head().key()?
    && let Some(tail) = exp.tail()?
    && let Some(id)   = tail.head().sym()?
    && let Some(body) = tail.tail()?
    {
        let _ = cb(id, body)?;
        Ok(())
    } else {
        return Err("unexpected: {exp:?}".into());
    }
}
/// Profile
#[derive(Default, Debug)]
pub struct Profile {
    /// Path of configuration entrypoint
    pub path: PathBuf,
    /// Name of configuration
    pub name: Option<Arc<str>>,
    /// Description of configuration
    pub info: Option<Arc<str>>,
    /// View definition
    pub view: Arc<str>,
    // Input keymap
    pub keys: EventMap<TuiEvent, AppCommand>,
}
impl Profile {
    fn from_dsl (dsl: impl Dsl) -> Usually<Self> {
        let mut profile = Self { ..Default::default() };
        dsl.each(|dsl|{
            let head = dsl.head();
            let exp  = dsl.exp();
            Ok(if exp.head().key() == Ok(Some("name")) {
                profile.name = Some(exp.tail()?.unwrap_or_default().into());
            } else if exp.head().key() == Ok(Some("info")) {
                profile.info = Some(exp.tail()?.unwrap_or_default().into());
            })
        })?;
        Ok(profile)
    }
}
impl Profile {
    fn load_template (&mut self, dsl: impl Dsl) -> Usually<&mut Self> {
        //dsl.src()?.unwrap_or_default().each(|item|Ok(match () {
            //_ if let Some(exp) = dsl.exp()? => match exp.head()?.key()? {
                //Some("name") => match exp.tail()?.text()? {
                    //Some(name) => self.name = Some(name.into()),
                    //_ => return Err(format!("missing name definition").into())
                //},
                //Some("info") => match exp.tail()?.text()? {
                    //Some(info) => self.info = Some(info.into()),
                    //_ => return Err(format!("missing info definition").into())
                //},
                //Some("bind") => match exp.tail()? {
                    //Some(keys) => self.keys = EventMap::from_dsl(&mut &keys)?,
                    //_ => return Err(format!("missing keys definition").into())
                //},
                //Some("view") => match exp.tail()? {
                    //Some(tail) => self.view = tail.src()?.unwrap_or_default().into(),
                    //_ => return Err(format!("missing view definition").into())
                //},
                //dsl => return Err(format!("unexpected: {dsl:?}").into())
            //},
            //_ => return Err(format!("unexpected: {dsl:?}").into())
        //}));
        Ok(self)
    }
    fn load_binding (&mut self, dsl: impl Dsl) -> Usually<&mut Self> {
        todo!();
        Ok(self)
    }
}
/// Various possible dialog modes.
#[derive(Debug, Clone, Default)]
pub enum Dialog {
    #[default] None,
    Help(usize),
    Menu(usize),
    Device(usize),
    Message(Arc<str>),
    Browser(BrowserTarget, Arc<Browser>),
    Options,
}
impl App {
    pub fn update_clock (&self) {
        ViewCache::update_clock(&self.project.clock.view_cache, self.clock(), self.size.w() > 80)
    }
}
has!(Jack<'static>:      |self: App|self.jack);
has!(Pool:               |self: App|self.pool);
has!(Dialog:             |self: App|self.dialog);
has!(Clock:              |self: App|self.project.clock);
has!(Option<MidiEditor>: |self: App|self.project.editor);
has!(Selection:          |self: App|self.project.selection);
has!(Vec<MidiInput>:     |self: App|self.project.midi_ins);
has!(Vec<MidiOutput>:    |self: App|self.project.midi_outs);
has!(Vec<Scene>:         |self: App|self.project.scenes);
has!(Vec<Track>:         |self: App|self.project.tracks);
has!(Measure<TuiOut>:    |self: App|self.size);
has_clips!(              |self: App|self.pool.clips);
maybe_has!(Track: |self: App| { MaybeHas::<Track>::get(&self.project) };
                              { MaybeHas::<Track>::get_mut(&mut self.project) });
maybe_has!(Scene: |self: App| { MaybeHas::<Scene>::get(&self.project) };
                              { MaybeHas::<Scene>::get_mut(&mut self.project) });
impl HasClipsSize   for App { fn clips_size (&self) -> &Measure<TuiOut> { &self.project.inner_size } }
impl HasTrackScroll for App { fn track_scroll (&self) -> usize { self.project.track_scroll() } }
impl HasSceneScroll for App { fn scene_scroll (&self) -> usize { self.project.scene_scroll() } }
fn unquote (x: &str) -> &str {
    let mut chars = x.chars();
    chars.next();
    //chars.next_back();
    chars.as_str()
}
impl Dialog {
    fn menu_selected (&self) -> Option<usize> {
        if let Self::Menu(selected) = self { Some(*selected) } else { None }
    }
    fn device_selected (&self) -> Option<usize> {
        if let Self::Device(selected) = self { Some(*selected) } else { None }
    }
    fn message (&self) -> Option<&str> {
        todo!()
    }
    fn browser (&self) -> Option<&Arc<Browser>> {
        todo!()
    }
    fn browser_target (&self) -> Option<&BrowserTarget> {
        todo!()
    }
}