// Prevent console window in addition to Slint window in Windows release builds when, e.g., starting the app via file manager. Ignored on other platforms.
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

use std::{error::Error, rc::Rc, sync::{Arc, Mutex}};

use aliveline::{color_id_from_name, config::Config, load_config, log::{Event, Log}};
use chrono::{Datelike, Timelike};
use slint::{Color, Model, ModelRc, SharedString, ToSharedString, VecModel, Weak};
use toml::value::{Date as TomlDate, Time};

slint::include_modules!();

impl From<Event> for TimelineEvent {
    fn from(event: Event) -> Self {
        let start = (event.start.hour as i32) * 3600
            + (event.start.minute as i32) * 60
            + (event.start.second as i32);
        let end = (event.end.hour as i32) * 3600
            + (event.end.minute as i32) * 60
            + (event.end.second as i32);
        TimelineEvent {
            start,
            duration: end - start,
            label: event.name.to_shared_string(),
            finished: event.finished,
            color_id: color_id_from_name(event.name)
        }
    }
}

impl From<TimelineEvent> for Event {
    fn from(event: TimelineEvent) -> Self {
        let start = Time {
            hour: (event.start / 3600) as u8,
            minute: ((event.start % 3600) / 60) as u8,
            second: (event.start % 60) as u8,
            nanosecond: 0
        };
        let endsecs = event.start + event.duration;
        let end = Time {
            hour: (endsecs / 3600) as u8,
            minute: ((endsecs % 3600) / 60) as u8,
            second: (endsecs % 60) as u8,
            nanosecond: 0
        };
        Event { start, end, name: event.label.to_string(), finished: event.finished }
    }
}

fn load_log(ui_weak: Weak<AppWindow>, log: Arc<Mutex<Log>>) {
    let ui = ui_weak.unwrap();
    let log_guard = log.lock().expect("Log shouldn't be used twice");
    let events: Vec<TimelineEvent> = (*log_guard)
        .events
        .iter()
        .map(|event| TimelineEvent::from((*event).clone()))
        .collect();
    let in_progress = events.iter().any(|event| !event.finished);
    let model: ModelRc<TimelineEvent> = Rc::new(VecModel::from(events)).into();
    ui.set_record_events(model);
    ui.set_in_progress(in_progress);
    ui.invoke_get_previous_event();
}

fn load_colors(ui_weak: Weak<AppWindow>, config: Arc<Config>) {
    let ui = ui_weak.unwrap();
    let pal = ui.global::<Palette>();
    pal.set_background(Color::from_argb_encoded(config.colors.background));
    pal.set_timeline(Color::from_argb_encoded(config.colors.timeline));
    pal.set_background_text(Color::from_argb_encoded(config.colors.background_text));

    // This looks like war crime
    let event_colors_rc: ModelRc<Color> = Rc::new(VecModel::from(
        config.event_colors.iter()
            .map(|value| Color::from_argb_encoded(*value)).collect::<Vec<Color>>()
    )).into();
    pal.set_event_colors(event_colors_rc);
    let event_text_rc: ModelRc<Color> = Rc::new(VecModel::from(
        config.text_colors.iter()
            .map(|value| Color::from_argb_encoded(*value)).collect::<Vec<Color>>()
    )).into();
    pal.set_event_text(event_text_rc);
}

fn main() -> Result<(), Box<dyn Error>> {
    let ui = AppWindow::new()?;
    
    let now = chrono::Local::now();
    let offset = now.hour() * 3600 + now.minute() * 60 + now.second();

    let date: TomlDate = TomlDate {
        day: now.day() as u8,
        month: now.month() as u8,
        year: now.year() as u16
    };

    let config: Arc<Config> = Arc::new(load_config());
    let writing_log: Arc<Mutex<Log>> = Arc::new(Mutex::new(Log::load_from(&config, date)));

    let ui_weak = ui.as_weak();
    let log = writing_log.clone();
    load_log(ui_weak, log);

    let ui_weak = ui.as_weak();
    let config_arc = config.clone();
    load_colors(ui_weak, config_arc);

    ui.invoke_update_record_offset(offset as i32);

    ui.on_fetch_log({
        let config = config.clone();
        let ui_weak = ui.as_weak();
        move |year: i32, month: i32, day: i32| {
            let ui = ui_weak.unwrap();
            let date = TomlDate {
                year: year as u16,
                month: month as u8,
                day: day as u8
            };
            let events: Vec<TimelineEvent> = Log::load_from(&config, date)
                .events
                .iter()
                .map(|event| TimelineEvent::from((*event).clone()))
                .collect();
            let model: ModelRc<TimelineEvent> = Rc::new(VecModel::from(events)).into();
            ui.set_review_events(model);
        }
    });

    ui.on_save_log({
        let config = config.clone();
        let log = writing_log.clone();
        move || {
            let log_guard = log.lock().expect("Log shouldn't be used twice");
            if let Err(error) = (*log_guard).save(&config) {
                eprintln!("Error occured while saving log: {error}");
            }
        }
    });
   
    ui.on_update_visible_time({
        let ui_weak = ui.as_weak();
        move |is_record: bool, hours_string: SharedString| {
            let ui = ui_weak.unwrap();
            let hours = hours_string.split(' ')
                .next()
                .map(|h| h.parse::<i32>().unwrap())
                .unwrap();
            if is_record {
                ui.set_record_visible_time(hours * 3600);
            } else {
                ui.set_review_visible_time(hours * 3600);
            }
        }
    });
    
    ui.on_start_new_event({
        let ui_weak = ui.as_weak();
        let log = writing_log.clone();
        move |event_name: SharedString| {
            let ui = ui_weak.unwrap();

            let events_rc = ui.get_record_events();
            let events = events_rc.as_any()
                .downcast_ref::<VecModel<TimelineEvent>>()
                .unwrap();
            let offset = ui.get_record_offset();
            
            let event = TimelineEvent {
                duration: 0,
                finished: false,
                label: event_name.clone(),
                start: offset,
                color_id: color_id_from_name(event_name.to_string())
            };
            
            {
                let mut log_guard = log.lock().expect("Log shouldn't be used twice");
                (*log_guard).events.push(Event::from(event.clone()));
            }

            ui.invoke_save_log();

            events.push(event);
        }
    });

    ui.on_stop_event({
        let ui_weak = ui.as_weak();
        let log = writing_log.clone();
        move || {
            let ui = ui_weak.unwrap();
            let events_rc = ui.get_record_events();
            let events = events_rc.as_any()
                .downcast_ref::<VecModel<TimelineEvent>>()
                .unwrap();
            let offset = ui.get_record_offset();
            
            let event_id = events.iter()
                .position(|data| !data.finished)
                .unwrap();
            let event = events.row_data(event_id)
                .expect("stop-event called without unfinished events");
            let new_event = TimelineEvent { 
                duration: offset - event.start,
                finished: true,
                label: event.label.clone(),
                start: event.start,
                color_id: color_id_from_name(event.label.to_string())
            };

            {
                let mut log_guard = log.lock().expect("Log shouldn't be used twice");
                log_guard.events.push(Event::from(new_event.clone()));
                let index = log_guard.events.iter().position(|data| !data.finished).unwrap();
                log_guard.events.swap_remove(index);
            }

            ui.invoke_save_log();

            events.set_row_data(event_id, new_event);
        }
    });

    ui.on_chain_event({
        let ui_weak = ui.as_weak();
        move |event_name: SharedString| {
            let ui = ui_weak.unwrap();
            ui.invoke_stop_event();
            ui.invoke_start_new_event(event_name);
        }
    });
    
    ui.on_get_previous_event({
        let ui_weak = ui.as_weak();
        let log = writing_log.clone();
        move || {
            let ui = ui_weak.unwrap();
            let prev_event_name = {
                let log_guard = log.lock().expect("Log shouldn't be used twice");
                match log_guard.events.len().checked_sub(2) {
                    Some(prev_index) => {
                        let prev_event = log_guard.events
                            .get(prev_index)
                            .expect("Index is already checked")
                            .name
                            .clone();
                        Some(prev_event)
                    },
                    None => None,
                }
            };
            ui.set_previous_event_name(prev_event_name.unwrap_or_default().to_shared_string());
        }
    });

    ui.on_new_day_started({
        let ui_weak = ui.as_weak();
        let log = writing_log.clone();
        move || {
            let ui = ui_weak.unwrap();
            
            let new_event: Option<Event> = {
                let log_guard = log.lock().expect("Log shouldn't be used twice");

                let maybe_unfinished_event = log_guard.events.iter().find(|event| !event.finished);
                match maybe_unfinished_event {
                    Some(unfinished_event) => Some(Event::new(unfinished_event.name.clone(), 0, 0, false)),
                    _ => None
                }
            };

            ui.invoke_stop_event();

            {
                let mut log_guard = log.lock().expect("Log shouldn't be used twice");
                log_guard.events.clear();
                let now = chrono::Local::now();

                let date = TomlDate {
                    year: now.year() as u16,
                    month: now.month() as u8,
                    day: now.day() as u8
                };

                log_guard.date = date;
                log_guard.events.clear();
            
                if let Some(event) = new_event {
                    log_guard.events.push(event);
                }
            }

            load_log(ui.as_weak(), log.clone());
            ui.invoke_save_log();
        }
    });

    ui.invoke_get_previous_event();

    ui.run()?;


    Ok(())
}