use crate::app::App;
use crate::models::servarr_models::{DiskSpace, RootFolder};
use crate::ui::THEME;
use crate::ui::styles::{
  ManagarrStyle, default_style, failure_style, primary_style, secondary_style,
  system_function_style,
};
use ratatui::layout::{Alignment, Constraint, Layout, Rect};
use ratatui::style::{Style, Stylize};
use ratatui::text::{Line, Span, Text};
use ratatui::widgets::{Block, BorderType, Borders, LineGauge, ListItem, Paragraph, Wrap};
use std::collections::{HashMap, HashSet};
use std::path::{Path, PathBuf};

#[cfg(test)]
#[path = "utils_tests.rs"]
mod utils_tests;

pub fn background_block<'a>() -> Block<'a> {
  THEME.with(|theme| {
    let background = theme.get().background.unwrap();

    if background.enabled.unwrap() {
      Block::new().white().bg(background.color.unwrap())
    } else {
      Block::new().white()
    }
  })
}

pub fn layout_block<'a>() -> Block<'a> {
  Block::new()
    .borders(Borders::ALL)
    .border_type(BorderType::Rounded)
}

pub fn layout_block_with_title(title_span: Span<'_>) -> Block<'_> {
  layout_block().title(title_span)
}

pub fn layout_block_top_border_with_title(title_span: Span<'_>) -> Block<'_> {
  layout_block_top_border().title(title_span)
}

pub fn layout_block_top_border<'a>() -> Block<'a> {
  Block::new().borders(Borders::TOP).default_color()
}

pub fn layout_block_bottom_border<'a>() -> Block<'a> {
  Block::new().borders(Borders::BOTTOM).default_color()
}

pub fn layout_paragraph_borderless(string: &str) -> Paragraph<'_> {
  Paragraph::new(Text::from(string))
    .block(borderless_block())
    .primary()
    .bold()
    .wrap(Wrap { trim: false })
    .centered()
}

pub fn borderless_block<'a>() -> Block<'a> {
  Block::new().default_color()
}

pub fn style_block_highlight(is_selected: bool) -> Style {
  if is_selected {
    system_function_style().bold()
  } else {
    default_style().bold()
  }
}

pub fn title_style(title: &str) -> Span<'_> {
  format!("  {title}  ").bold()
}

pub fn unstyled_title_block(title: &str) -> Block<'_> {
  layout_block_with_title(title_style(title))
}

pub fn title_block(title: &str) -> Block<'_> {
  unstyled_title_block(title).default_color()
}

pub fn title_block_centered(title: &str) -> Block<'_> {
  title_block(title).title_alignment(Alignment::Center)
}

pub fn logo_block<'a>() -> Block<'a> {
  layout_block().default_color().title(Span::styled(
    " Managarr - A Servarr management TUI ",
    Style::new().magenta().bold().italic(),
  ))
}

pub fn centered_rect(percent_x: u16, percent_y: u16, area: Rect) -> Rect {
  let [_, vertical_area, _] = Layout::vertical([
    Constraint::Percentage((100 - percent_y) / 2),
    Constraint::Percentage(percent_y),
    Constraint::Percentage((100 - percent_y) / 2),
  ])
  .areas(area);

  let [_, horizontal_layout, _] = Layout::horizontal([
    Constraint::Percentage((100 - percent_x) / 2),
    Constraint::Percentage(percent_x),
    Constraint::Percentage((100 - percent_x) / 2),
  ])
  .areas(vertical_area);

  horizontal_layout
}

pub fn line_gauge_with_title(title: &str, ratio: f64) -> LineGauge<'_> {
  LineGauge::default()
    .block(Block::new().title(title))
    .filled_style(primary_style())
    .filled_symbol("━")
    .unfilled_symbol("━")
    .ratio(ratio)
    .label(Line::from(format!("{:.0}%", ratio * 100.0)))
}

pub fn line_gauge_with_label(title: &str, ratio: f64) -> LineGauge<'_> {
  LineGauge::default()
    .block(Block::new())
    .filled_style(primary_style())
    .filled_symbol("━")
    .unfilled_symbol("━")
    .ratio(ratio)
    .label(Line::from(format!("{title}: {:.0}%", ratio * 100.0)))
}

pub fn get_width_from_percentage(area: Rect, percentage: u16) -> usize {
  (area.width as f64 * (percentage as f64 / 100.0)) as usize
}

pub(super) fn style_log_list_item(list_item: ListItem<'_>, level: String) -> ListItem<'_> {
  match level.to_lowercase().as_str() {
    "trace" => list_item.gray(),
    "debug" => list_item.blue(),
    "info" => list_item.style(default_style()),
    "warn" => list_item.style(secondary_style()),
    "error" => list_item.style(failure_style()),
    "fatal" => list_item.style(failure_style().bold()),
    _ => list_item.style(default_style()),
  }
}

pub(super) fn convert_to_minutes_hours_days(time: i64) -> String {
  if time < 60 {
    if time == 0 {
      "now".to_owned()
    } else if time == 1 {
      format!("{time} minute")
    } else {
      format!("{time} minutes")
    }
  } else if time / 60 < 24 {
    let hours = time / 60;
    if hours == 1 {
      format!("{hours} hour")
    } else {
      format!("{hours} hours")
    }
  } else {
    let days = time / (60 * 24);
    if days == 1 {
      format!("{days} day")
    } else {
      format!("{days} days")
    }
  }
}

pub(super) fn decorate_peer_style(seeders: u64, leechers: u64, text: Text<'_>) -> Text<'_> {
  if seeders == 0 {
    text.failure()
  } else if seeders < leechers {
    text.warning()
  } else {
    text.success()
  }
}

pub(super) fn extract_monitored_root_folders(
  app: &App<'_>,
  root_folders: Vec<RootFolder>,
) -> Vec<RootFolder> {
  let monitored_paths = app
    .server_tabs
    .get_active_config()
    .as_ref()
    .unwrap()
    .monitored_storage_paths
    .as_ref();

  if let Some(monitored_paths) = monitored_paths
    && !monitored_paths.is_empty()
  {
    let monitored_paths: Vec<PathBuf> = monitored_paths.iter().map(PathBuf::from).collect();

    let mut collapsed_folders: HashMap<PathBuf, (RootFolder, Vec<String>)> = HashMap::new();
    let mut unmatched_folders: Vec<RootFolder> = Vec::new();

    for root_folder in root_folders {
      let root_path = Path::new(&root_folder.path);

      let matching_monitored_path = monitored_paths
        .iter()
        .filter(|mp| root_path.starts_with(mp))
        .max_by_key(|mp| mp.components().count());

      if let Some(monitored_path) = matching_monitored_path {
        let subfolder_name = root_path
          .strip_prefix(monitored_path)
          .ok()
          .and_then(|p| p.components().next())
          .map(|c| c.as_os_str().to_string_lossy().to_string())
          .unwrap_or_default();

        collapsed_folders
          .entry(monitored_path.clone())
          .and_modify(|(_, subfolders)| {
            if !subfolder_name.is_empty() && !subfolders.contains(&subfolder_name) {
              subfolders.push(subfolder_name.clone());
            }
          })
          .or_insert_with(|| {
            let subfolders = if subfolder_name.is_empty() {
              vec![]
            } else {
              vec![subfolder_name]
            };
            (root_folder.clone(), subfolders)
          });
      } else {
        unmatched_folders.push(root_folder);
      }
    }

    let mut result: Vec<RootFolder> = collapsed_folders
      .into_iter()
      .map(|(monitored_path, (mut root_folder, mut subfolders))| {
        subfolders.sort();
        let path_str = monitored_path.to_string_lossy();
        root_folder.path = if subfolders.is_empty() {
          path_str.to_string()
        } else {
          format!(
            "{}/[{}]",
            path_str.trim_end_matches('/'),
            subfolders.join(",")
          )
        };
        root_folder
      })
      .collect();

    result.extend(unmatched_folders);
    result.sort_by(|a, b| a.path.cmp(&b.path));
    result
  } else {
    root_folders
  }
}

pub(super) fn extract_monitored_disk_space_vec(
  app: &App<'_>,
  disk_space_vec: Vec<DiskSpace>,
) -> Vec<DiskSpace> {
  let monitored_paths = app
    .server_tabs
    .get_active_config()
    .as_ref()
    .unwrap()
    .monitored_storage_paths
    .as_ref();
  if let Some(monitored_paths) = monitored_paths
    && !monitored_paths.is_empty()
  {
    let monitored: HashSet<&str> = monitored_paths.iter().map(|s| s.as_str()).collect();
    let mut seen_paths = HashSet::new();
    let mut filtered_disk_space_vec = Vec::with_capacity(disk_space_vec.len());

    for ds in disk_space_vec {
      match ds.path.as_deref() {
        None => filtered_disk_space_vec.push(ds),
        Some(p) => {
          if monitored.contains(p) && seen_paths.insert(p.to_owned()) {
            filtered_disk_space_vec.push(ds)
          }
        }
      }
    }

    filtered_disk_space_vec
  } else {
    disk_space_vec
  }
}