use glib;
use gtk;

use gtk::prelude::*;
use chrono::prelude::*;

use open;
use humansize::{file_size_opts as size_opts, FileSize};

use hammond_data::dbqueries;
use hammond_data::{EpisodeWidgetQuery, Podcast};
// use hammond_data::utils::*;
use hammond_data::errors::*;
use hammond_downloader::downloader;

use app::Action;
use manager;

use std::sync::mpsc::Sender;
use std::sync::{Arc, Mutex};
use std::path::Path;

lazy_static! {
    static ref SIZE_OPTS: Arc<size_opts::FileSizeOpts> =  {
        // Declare a custom humansize option struct
        // See: https://docs.rs/humansize/1.0.2/humansize/file_size_opts/struct.FileSizeOpts.html
        Arc::new(size_opts::FileSizeOpts {
            divider: size_opts::Kilo::Binary,
            units: size_opts::Kilo::Decimal,
            decimal_places: 0,
            decimal_zeroes: 0,
            fixed_at: size_opts::FixedAt::No,
            long_units: false,
            space: true,
            suffix: "",
            allow_negative: false,
        })
    };
}

#[derive(Debug, Clone)]
pub struct EpisodeWidget {
    pub container: gtk::Box,
    play: gtk::Button,
    download: gtk::Button,
    cancel: gtk::Button,
    title: gtk::Label,
    date: gtk::Label,
    duration: gtk::Label,
    progress: gtk::ProgressBar,
    total_size: gtk::Label,
    local_size: gtk::Label,
    separator1: gtk::Label,
    separator2: gtk::Label,
    prog_separator: gtk::Label,
}

impl Default for EpisodeWidget {
    fn default() -> Self {
        let builder = gtk::Builder::new_from_resource("/org/gnome/hammond/gtk/episode_widget.ui");

        let container: gtk::Box = builder.get_object("episode_container").unwrap();
        let progress: gtk::ProgressBar = builder.get_object("progress_bar").unwrap();

        let download: gtk::Button = builder.get_object("download_button").unwrap();
        let play: gtk::Button = builder.get_object("play_button").unwrap();
        let cancel: gtk::Button = builder.get_object("cancel_button").unwrap();

        let title: gtk::Label = builder.get_object("title_label").unwrap();
        let date: gtk::Label = builder.get_object("date_label").unwrap();
        let duration: gtk::Label = builder.get_object("duration_label").unwrap();
        let local_size: gtk::Label = builder.get_object("local_size").unwrap();
        let total_size: gtk::Label = builder.get_object("total_size").unwrap();

        let separator1: gtk::Label = builder.get_object("separator1").unwrap();
        let separator2: gtk::Label = builder.get_object("separator2").unwrap();
        let prog_separator: gtk::Label = builder.get_object("prog_separator").unwrap();

        EpisodeWidget {
            container,
            progress,
            download,
            play,
            cancel,
            title,
            duration,
            date,
            total_size,
            local_size,
            separator1,
            separator2,
            prog_separator,
        }
    }
}

impl EpisodeWidget {
    pub fn new(episode: &mut EpisodeWidgetQuery, sender: Sender<Action>) -> EpisodeWidget {
        let widget = EpisodeWidget::default();
        widget.init(episode, sender);
        widget
    }

    // TODO: wire the cancel button.
    fn init(&self, episode: &mut EpisodeWidgetQuery, sender: Sender<Action>) {
        WidgetExt::set_name(&self.container, &episode.rowid().to_string());

        // Set the title label state.
        self.set_title(episode);

        // Set the size label.
        self.set_total_size(episode.length());

        // Set the duaration label.
        self.set_duration(episode.duration());

        // Set the date label.
        self.set_date(episode.epoch());

        // Show or hide the play/delete/download buttons upon widget initialization.
        self.show_buttons(episode.local_uri());

        // Determine what the state of the progress bar should be.
        self.determine_progess_bar();

        let title = &self.title;
        self.play
            .connect_clicked(clone!(episode, title, sender => move |_| {
            let mut episode = episode.clone();
            on_play_bttn_clicked(episode.rowid());
            if episode.set_played_now().is_ok() {
                title
                    .get_style_context()
                    .map(|c| c.add_class("dim-label"));
                sender.send(Action::RefreshEpisodesViewBGR).unwrap();
            };
        }));

        self.download
            .connect_clicked(clone!(episode, sender => move |dl| {
                dl.set_sensitive(false);
                on_download_clicked(&mut episode.clone(), sender.clone());
        }));
    }

    /// Show or hide the play/delete/download buttons upon widget initialization.
    fn show_buttons(&self, local_uri: Option<&str>) {
        if local_uri.is_some() && Path::new(local_uri.unwrap()).exists() {
            self.download.hide();
            self.play.show();
        }
    }

    /// Determine the title state.
    fn set_title(&self, episode: &EpisodeWidgetQuery) {
        self.title.set_xalign(0.0);
        self.title.set_text(episode.title());

        // Grey out the title if the episode is played.
        if episode.played().is_some() {
            self.title
                .get_style_context()
                .map(|c| c.add_class("dim-label"));
        }
    }

    /// Set the date label depending on the current time.
    fn set_date(&self, epoch: i32) {
        let now = Utc::now();
        let date = Utc.timestamp(i64::from(epoch), 0);
        if now.year() == date.year() {
            self.date.set_text(&date.format("%e %b").to_string().trim());
        } else {
            self.date
                .set_text(&date.format("%e %b %Y").to_string().trim());
        };
    }

    /// Set the duration label.
    fn set_duration(&self, seconds: Option<i32>) {
        if let Some(secs) = seconds {
            self.duration.set_text(&format!("{} min", secs / 60));
            self.duration.show();
            self.separator1.show();
        }
    }

    /// Set the Episode label dependings on its size
    fn set_total_size(&self, bytes: Option<i32>) {
        if let Some(size) = bytes {
            if size != 0 {
                size.file_size(SIZE_OPTS.clone()).ok().map(|s| {
                    self.total_size.set_text(&s);
                    self.total_size.show();
                    self.separator2.show();
                });
            }
        };
    }

    // FIXME: REFACTOR ME
    fn determine_progess_bar(&self) {
        let id = WidgetExt::get_name(&self.container)
            .unwrap()
            .parse::<i32>()
            .unwrap();

        let prog_struct = || -> Option<_> {
            if let Ok(m) = manager::ACTIVE_DOWNLOADS.read() {
                if !m.contains_key(&id) {
                    return None;
                };
                return m.get(&id).cloned();
            }
            None
        }();

        let progress_bar = self.progress.clone();
        let total_size = self.total_size.clone();
        let local_size = self.local_size.clone();
        if let Some(prog) = prog_struct {
            self.download.hide();
            self.progress.show();
            self.local_size.show();
            self.total_size.show();
            self.separator2.show();
            self.prog_separator.show();
            self.cancel.show();

            // Setup a callback that will update the progress bar.
            update_progressbar_callback(prog.clone(), id, progress_bar, local_size);

            // Setup a callback that will update the total_size label
            // with the http ContentLength header number rather than
            // relying to the RSS feed.
            update_total_size_callback(prog.clone(), total_size);
        }
    }
}

fn on_download_clicked(ep: &EpisodeWidgetQuery, sender: Sender<Action>) {
    let download_fold = dbqueries::get_podcast_from_id(ep.podcast_id())
        .ok()
        .map(|pd| downloader::get_download_folder(&pd.title().to_owned()).ok())
        .and_then(|x| x);

    // Start a new download.
    if let Some(fold) = download_fold {
        manager::add(ep.rowid(), &fold, sender.clone());
    }

    // Update Views
    sender.send(Action::RefreshEpisodesView).unwrap();
    sender.send(Action::RefreshWidgetIfVis).unwrap();
}

fn on_play_bttn_clicked(episode_id: i32) {
    let local_uri = dbqueries::get_episode_local_uri_from_id(episode_id)
        .ok()
        .and_then(|x| x);

    if let Some(uri) = local_uri {
        if Path::new(&uri).exists() {
            info!("Opening {}", uri);
            open::that(&uri).err().map(|err| {
                error!("Error while trying to open file: {}", uri);
                error!("Error: {}", err);
            });
        }
    } else {
        error!(
            "Something went wrong evaluating the following path: {:?}",
            local_uri
        );
    }
}

// Setup a callback that will update the progress bar.
fn update_progressbar_callback(
    prog: Arc<Mutex<manager::Progress>>,
    episode_rowid: i32,
    progress_bar: gtk::ProgressBar,
    local_size: gtk::Label,
) {
    timeout_add(
        400,
        clone!(prog, progress_bar => move || {
            let (fraction, downloaded) = {
                let m = prog.lock().unwrap();
                (m.get_fraction(), m.get_downloaded())
            };

            // Update local_size label
            downloaded.file_size(SIZE_OPTS.clone()).ok().map(|x| local_size.set_text(&x));

            // I hate floating points.
            // Update the progress_bar.
            if (fraction >= 0.0) && (fraction <= 1.0) && (!fraction.is_nan()) {
                progress_bar.set_fraction(fraction);
            }

            // info!("Fraction: {}", progress_bar.get_fraction());
            // info!("Fraction: {}", fraction);

            // Check if the download is still active
            let active = {
                let m = manager::ACTIVE_DOWNLOADS.read().unwrap();
                m.contains_key(&episode_rowid)
            };

            if (fraction >= 1.0) && (!fraction.is_nan()){
                glib::Continue(false)
            } else if !active {
                glib::Continue(false)
            } else {
                glib::Continue(true)
            }
        }),
    );
}

// Setup a callback that will update the total_size label
// with the http ContentLength header number rather than
// relying to the RSS feed.
fn update_total_size_callback(prog: Arc<Mutex<manager::Progress>>, total_size: gtk::Label) {
    timeout_add(
        500,
        clone!(prog, total_size => move || {
            let total_bytes = {
                let m = prog.lock().unwrap();
                m.get_total_size()
            };

            debug!("Total Size: {}", total_bytes);
            if total_bytes != 0 {
                // Update the total_size label
                total_bytes.file_size(SIZE_OPTS.clone()).ok().map(|x| total_size.set_text(&x));
                glib::Continue(false)
            } else {
                glib::Continue(true)
            }
        }),
    );
}

// fn on_delete_bttn_clicked(episode_id: i32) {
//     let mut ep = dbqueries::get_episode_from_rowid(episode_id)
//         .unwrap()
//         .into();

//     let e = delete_local_content(&mut ep);
//     if let Err(err) = e {
//         error!("Error while trying to delete file: {:?}", ep.local_uri());
//         error!("Error: {}", err);
//     };
// }

pub fn episodes_listbox(pd: &Podcast, sender: Sender<Action>) -> Result<gtk::ListBox> {
    let mut episodes = dbqueries::get_pd_episodeswidgets(pd)?;

    let list = gtk::ListBox::new();

    episodes.iter_mut().for_each(|ep| {
        let widget = EpisodeWidget::new(ep, sender.clone());
        list.add(&widget.container);
    });

    list.set_vexpand(false);
    list.set_hexpand(false);
    list.set_visible(true);
    list.set_selection_mode(gtk::SelectionMode::None);
    Ok(list)
}