use std::{cmp, iter};

use chrono::{Duration, Utc};
use ratatui::layout::{Constraint, Layout, Rect};
use ratatui::prelude::Stylize;
use ratatui::text::Text;
use ratatui::widgets::{Paragraph, Row};
use ratatui::Frame;

use crate::app::App;
use crate::logos::RADARR_LOGO;
use crate::models::radarr_models::{DownloadRecord, Movie};
use crate::models::servarr_data::radarr::radarr_data::RadarrData;
use crate::models::servarr_models::{DiskSpace, RootFolder};
use crate::models::Route;
use crate::ui::draw_tabs;
use crate::ui::radarr_ui::blocklist::BlocklistUi;
use crate::ui::radarr_ui::collections::CollectionsUi;
use crate::ui::radarr_ui::downloads::DownloadsUi;
use crate::ui::radarr_ui::indexers::IndexersUi;
use crate::ui::radarr_ui::library::LibraryUi;
use crate::ui::radarr_ui::root_folders::RootFoldersUi;
use crate::ui::radarr_ui::system::SystemUi;
use crate::ui::styles::ManagarrStyle;
use crate::ui::utils::{
  borderless_block, layout_block, line_gauge_with_label, line_gauge_with_title, title_block,
};
use crate::ui::widgets::loading_block::LoadingBlock;
use crate::ui::DrawUi;
use crate::utils::convert_to_gb;

mod blocklist;
mod collections;
mod downloads;
mod indexers;
mod library;
mod root_folders;
mod system;

pub(super) struct RadarrUi;

impl DrawUi for RadarrUi {
  fn accepts(route: Route) -> bool {
    matches!(route, Route::Radarr(_, _))
  }

  fn draw(f: &mut Frame<'_>, app: &mut App<'_>, area: Rect) {
    let content_area = draw_tabs(f, area, "Movies", &app.data.radarr_data.main_tabs);
    let route = app.get_current_route();

    match route {
      _ if LibraryUi::accepts(route) => LibraryUi::draw(f, app, content_area),
      _ if CollectionsUi::accepts(route) => CollectionsUi::draw(f, app, content_area),
      _ if DownloadsUi::accepts(route) => DownloadsUi::draw(f, app, content_area),
      _ if IndexersUi::accepts(route) => IndexersUi::draw(f, app, content_area),
      _ if RootFoldersUi::accepts(route) => RootFoldersUi::draw(f, app, content_area),
      _ if SystemUi::accepts(route) => SystemUi::draw(f, app, content_area),
      _ if BlocklistUi::accepts(route) => BlocklistUi::draw(f, app, content_area),
      _ => (),
    }
  }

  fn draw_context_row(f: &mut Frame<'_>, app: &App<'_>, area: Rect) {
    let [main_area, logo_area] =
      Layout::horizontal([Constraint::Fill(0), Constraint::Length(20)]).areas(area);

    let [stats_area, downloads_area] =
      Layout::horizontal([Constraint::Ratio(1, 2), Constraint::Ratio(1, 2)]).areas(main_area);

    draw_stats_context(f, app, stats_area);
    draw_downloads_context(f, app, downloads_area);
    draw_radarr_logo(f, logo_area);
  }
}

fn draw_stats_context(f: &mut Frame<'_>, app: &App<'_>, area: Rect) {
  let block = title_block("Stats");

  if !app.data.radarr_data.version.is_empty() {
    f.render_widget(block, area);
    let RadarrData {
      root_folders,
      disk_space_vec,
      start_time,
      ..
    } = &app.data.radarr_data;

    let mut constraints = vec![
      Constraint::Length(1),
      Constraint::Length(1),
      Constraint::Length(1),
    ];

    constraints.append(
      &mut iter::repeat_n(
        Constraint::Length(1),
        disk_space_vec.len() + root_folders.items.len() + 1,
      )
      .collect(),
    );

    let stat_item_areas = Layout::vertical(constraints).margin(1).split(area);

    let version_paragraph = Paragraph::new(Text::from(format!(
      "Radarr Version:  {}",
      app.data.radarr_data.version
    )))
    .block(borderless_block())
    .bold();

    let uptime = Utc::now() - start_time.to_owned();
    let days = uptime.num_days();
    let day_difference = uptime - Duration::days(days);
    let hours = day_difference.num_hours();
    let hour_difference = day_difference - Duration::hours(hours);
    let minutes = hour_difference.num_minutes();
    let seconds = (hour_difference - Duration::minutes(minutes)).num_seconds();

    let uptime_paragraph = Paragraph::new(Text::from(format!(
      "Uptime: {days}d {hours:0width$}:{minutes:0width$}:{seconds:0width$}",
      width = 2
    )))
    .block(borderless_block())
    .bold();

    let storage = Paragraph::new(Text::from("Storage:")).block(borderless_block().bold());
    let folders = Paragraph::new(Text::from("Root Folders:")).block(borderless_block().bold());

    f.render_widget(version_paragraph, stat_item_areas[0]);
    f.render_widget(uptime_paragraph, stat_item_areas[1]);
    f.render_widget(storage, stat_item_areas[2]);

    for i in 0..disk_space_vec.len() {
      let DiskSpace {
        free_space,
        total_space,
      } = &disk_space_vec[i];
      let title = format!("Disk {}", i + 1);
      let ratio = if *total_space == 0 {
        0f64
      } else {
        1f64 - (*free_space as f64 / *total_space as f64)
      };

      let space_gauge = line_gauge_with_label(title.as_str(), ratio);

      f.render_widget(space_gauge, stat_item_areas[i + 3]);
    }

    f.render_widget(folders, stat_item_areas[disk_space_vec.len() + 3]);

    for i in 0..root_folders.items.len() {
      let RootFolder {
        path, free_space, ..
      } = &root_folders.items[i];
      let space: f64 = convert_to_gb(*free_space);
      let root_folder_space = Paragraph::new(format!("{path}: {space:.2} GB free"))
        .block(borderless_block())
        .default();

      f.render_widget(
        root_folder_space,
        stat_item_areas[i + disk_space_vec.len() + 4],
      )
    }
  } else {
    f.render_widget(LoadingBlock::new(app.is_loading, block), area);
  }
}

fn draw_downloads_context(f: &mut Frame<'_>, app: &App<'_>, area: Rect) {
  let block = title_block("Downloads");
  let downloads_vec = &app.data.radarr_data.downloads.items;

  if !downloads_vec.is_empty() {
    f.render_widget(block, area);

    let max_items = ((((area.height as f32 / 2.0).floor() * 2.0) as i32) / 2) - 1;
    let items = cmp::min(downloads_vec.len(), max_items.unsigned_abs() as usize);
    let download_item_areas =
      Layout::vertical(iter::repeat_n(Constraint::Length(2), items).collect::<Vec<Constraint>>())
        .margin(1)
        .split(area);

    for i in 0..items {
      let DownloadRecord {
        title,
        sizeleft,
        size,
        ..
      } = &downloads_vec[i];
      let percent = if *size == 0 {
        0.0
      } else {
        1f64 - (*sizeleft as f64 / *size as f64)
      };
      let download_gauge = line_gauge_with_title(title, percent);

      f.render_widget(download_gauge, download_item_areas[i]);
    }
  } else {
    f.render_widget(LoadingBlock::new(app.is_loading, block), area);
  }
}

fn decorate_with_row_style<'a>(
  downloads_vec: &[DownloadRecord],
  movie: &Movie,
  row: Row<'a>,
) -> Row<'a> {
  if !movie.has_file {
    if let Some(download) = downloads_vec
      .iter()
      .find(|&download| download.movie_id == movie.id)
    {
      if download.status == "downloading" {
        return row.downloading();
      }

      if download.status == "completed" {
        return row.awaiting_import();
      }
    }

    if !movie.monitored {
      return row.unmonitored_missing();
    }

    if movie.status != "released" {
      return row.unreleased();
    }

    return row.missing();
  }

  if !movie.monitored {
    row.unmonitored()
  } else {
    row.downloaded()
  }
}

fn draw_radarr_logo(f: &mut Frame<'_>, area: Rect) {
  let logo_text = Text::from(RADARR_LOGO);
  let logo = Paragraph::new(logo_text)
    .light_yellow()
    .block(layout_block().default())
    .centered();
  f.render_widget(logo, area);
}
