use anyhow::anyhow;
use log::{debug, error};
use reqwest::Client;
use serde::{Deserialize, Serialize};
use tokio::sync::mpsc::Sender;
use tokio::time::Instant;

use crate::app::radarr::{ActiveRadarrBlock, RadarrData};
use crate::models::{HorizontallyScrollableText, Route, TabRoute, TabState};
use crate::network::NetworkEvent;

pub(crate) mod key_binding;
pub(crate) mod radarr;

const DEFAULT_ROUTE: Route = Route::Radarr(ActiveRadarrBlock::Movies, None);

pub struct App {
  navigation_stack: Vec<Route>,
  network_tx: Option<Sender<NetworkEvent>>,
  pub server_tabs: TabState,
  pub error: HorizontallyScrollableText,
  pub response: String,
  pub client: Client,
  pub title: &'static str,
  pub tick_until_poll: u64,
  pub ticks_until_scroll: u64,
  pub tick_count: u64,
  pub last_tick: Instant,
  pub is_routing: bool,
  pub is_loading: bool,
  pub should_refresh: bool,
  pub should_ignore_quit_key: bool,
  pub config: AppConfig,
  pub data: Data,
}

impl App {
  pub fn new(network_tx: Sender<NetworkEvent>, config: AppConfig) -> Self {
    App {
      network_tx: Some(network_tx),
      config,
      ..App::default()
    }
  }

  pub async fn dispatch_network_event(&mut self, action: NetworkEvent) {
    debug!("Dispatching network event: {:?}", action);

    self.is_loading = true;
    if let Some(network_tx) = &self.network_tx {
      if let Err(e) = network_tx.send(action).await {
        self.is_loading = false;
        error!("Failed to send event. {:?}", e);
        self.handle_error(anyhow!(e));
      }
    }
  }

  pub fn reset_tick_count(&mut self) {
    self.tick_count = 0;
  }

  // Allowing this code for now since we'll eventually be implementing additional Servarr support and we'll need it then
  #[allow(dead_code)]
  pub fn reset(&mut self) {
    self.reset_tick_count();
    self.error = HorizontallyScrollableText::default();
    self.data = Data::default();
  }

  pub fn handle_error(&mut self, error: anyhow::Error) {
    if self.error.text.is_empty() {
      self.error = error.to_string().into();
    }
  }

  pub async fn on_tick(&mut self, is_first_render: bool) {
    if self.tick_count % self.tick_until_poll == 0 || self.is_routing || self.should_refresh {
      if let Route::Radarr(active_radarr_block, _) = self.get_current_route() {
        self
          .radarr_on_tick(*active_radarr_block, is_first_render)
          .await;
      }

      self.is_routing = false;
      self.should_refresh = false;
    }

    self.tick_count += 1;
  }

  pub fn push_navigation_stack(&mut self, route: Route) {
    self.navigation_stack.push(route);
    self.is_routing = true;
  }

  pub fn pop_navigation_stack(&mut self) {
    self.is_routing = true;
    if self.navigation_stack.len() > 1 {
      self.navigation_stack.pop();
    }
  }

  pub fn pop_and_push_navigation_stack(&mut self, route: Route) {
    self.pop_navigation_stack();
    self.push_navigation_stack(route);
  }

  pub fn get_current_route(&self) -> &Route {
    self.navigation_stack.last().unwrap_or(&DEFAULT_ROUTE)
  }
}

impl Default for App {
  fn default() -> Self {
    App {
      navigation_stack: vec![DEFAULT_ROUTE],
      network_tx: None,
      error: HorizontallyScrollableText::default(),
      response: String::default(),
      server_tabs: TabState::new(vec![
        TabRoute {
          title: "Radarr".to_owned(),
          route: ActiveRadarrBlock::Movies.into(),
          help: "<↑↓> scroll | ←→ change tab | <tab> change servarr | <q> quit  ".to_owned(),
          contextual_help: None,
        },
        TabRoute {
          title: "Sonarr".to_owned(),
          route: Route::Sonarr,
          help: "<tab> change servarr | <q> quit  ".to_owned(),
          contextual_help: None,
        },
      ]),
      client: Client::new(),
      title: "Managarr",
      tick_until_poll: 400,
      ticks_until_scroll: 4,
      tick_count: 0,
      last_tick: Instant::now(),
      is_loading: false,
      is_routing: false,
      should_refresh: false,
      should_ignore_quit_key: false,
      config: AppConfig::default(),
      data: Data::default(),
    }
  }
}

#[derive(Default)]
pub struct Data {
  pub radarr_data: RadarrData,
}

#[derive(Debug, Deserialize, Serialize, Default)]
pub struct AppConfig {
  pub radarr: RadarrConfig,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct RadarrConfig {
  pub host: String,
  pub port: Option<u16>,
  pub api_token: String,
}

impl Default for RadarrConfig {
  fn default() -> Self {
    RadarrConfig {
      host: "localhost".to_string(),
      port: Some(7878),
      api_token: "".to_string(),
    }
  }
}

#[cfg(test)]
mod tests {
  use anyhow::anyhow;
  use pretty_assertions::{assert_eq, assert_str_eq};
  use tokio::sync::mpsc;

  use crate::app::radarr::{ActiveRadarrBlock, RadarrData};
  use crate::app::{App, Data, RadarrConfig, DEFAULT_ROUTE};
  use crate::models::{HorizontallyScrollableText, Route, TabRoute};
  use crate::network::radarr_network::RadarrEvent;
  use crate::network::NetworkEvent;

  #[test]
  fn test_app_default() {
    let app = App::default();

    assert_eq!(app.navigation_stack, vec![DEFAULT_ROUTE]);
    assert!(app.network_tx.is_none());
    assert_eq!(app.error, HorizontallyScrollableText::default());
    assert!(app.response.is_empty());
    assert_eq!(app.server_tabs.index, 0);
    assert_eq!(
      app.server_tabs.tabs,
      vec![
        TabRoute {
          title: "Radarr".to_owned(),
          route: ActiveRadarrBlock::Movies.into(),
          help: "<↑↓> scroll | ←→ change tab | <tab> change servarr | <q> quit  ".to_owned(),
          contextual_help: None,
        },
        TabRoute {
          title: "Sonarr".to_owned(),
          route: Route::Sonarr,
          help: "<tab> change servarr | <q> quit  ".to_owned(),
          contextual_help: None,
        }
      ]
    );
    assert_str_eq!(app.title, "Managarr");
    assert_eq!(app.tick_until_poll, 400);
    assert_eq!(app.ticks_until_scroll, 4);
    assert_eq!(app.tick_count, 0);
    assert!(!app.is_loading);
    assert!(!app.is_routing);
    assert!(!app.should_refresh);
    assert!(!app.should_ignore_quit_key);
  }

  #[test]
  fn test_navigation_stack_methods() {
    let mut app = App::default();

    assert_eq!(app.get_current_route(), &DEFAULT_ROUTE);

    app.push_navigation_stack(ActiveRadarrBlock::Downloads.into());

    assert_eq!(
      app.get_current_route(),
      &ActiveRadarrBlock::Downloads.into()
    );
    assert!(app.is_routing);

    app.is_routing = false;
    app.pop_and_push_navigation_stack(ActiveRadarrBlock::Collections.into());

    assert_eq!(
      app.get_current_route(),
      &ActiveRadarrBlock::Collections.into()
    );
    assert!(app.is_routing);

    app.is_routing = false;
    app.pop_navigation_stack();

    assert_eq!(app.get_current_route(), &DEFAULT_ROUTE);
    assert!(app.is_routing);

    app.is_routing = false;
    app.pop_navigation_stack();

    assert_eq!(app.get_current_route(), &DEFAULT_ROUTE);
    assert!(app.is_routing);
  }

  #[test]
  fn test_reset_tick_count() {
    let mut app = App {
      tick_count: 2,
      ..App::default()
    };

    app.reset_tick_count();

    assert_eq!(app.tick_count, 0);
  }

  #[test]
  fn test_reset() {
    let mut app = App {
      tick_count: 2,
      error: "Test error".to_owned().into(),
      data: Data {
        radarr_data: RadarrData {
          version: "test".to_owned(),
          ..RadarrData::default()
        },
      },
      ..App::default()
    };

    app.reset();

    assert_eq!(app.tick_count, 0);
    assert_eq!(app.error, HorizontallyScrollableText::default());
    assert!(app.data.radarr_data.version.is_empty());
  }

  #[test]
  fn test_handle_error() {
    let mut app = App::default();
    let test_string = "Testing";

    app.handle_error(anyhow!(test_string));

    assert_eq!(app.error.text, test_string);

    app.handle_error(anyhow!("Testing a different error"));

    assert_eq!(app.error.text, test_string);
  }

  #[tokio::test]
  async fn test_on_tick_first_render() {
    let (sync_network_tx, mut sync_network_rx) = mpsc::channel::<NetworkEvent>(500);

    let mut app = App {
      tick_until_poll: 2,
      network_tx: Some(sync_network_tx),
      ..App::default()
    };

    assert_eq!(app.tick_count, 0);

    app.on_tick(true).await;
    assert_eq!(
      sync_network_rx.recv().await.unwrap(),
      RadarrEvent::GetQualityProfiles.into()
    );
    assert_eq!(
      sync_network_rx.recv().await.unwrap(),
      RadarrEvent::GetTags.into()
    );
    assert_eq!(
      sync_network_rx.recv().await.unwrap(),
      RadarrEvent::GetRootFolders.into()
    );
    assert_eq!(
      sync_network_rx.recv().await.unwrap(),
      RadarrEvent::GetOverview.into()
    );
    assert_eq!(
      sync_network_rx.recv().await.unwrap(),
      RadarrEvent::GetStatus.into()
    );
    assert_eq!(
      sync_network_rx.recv().await.unwrap(),
      RadarrEvent::GetMovies.into()
    );
    assert_eq!(
      sync_network_rx.recv().await.unwrap(),
      RadarrEvent::GetDownloads.into()
    );
    assert!(!app.is_routing);
    assert!(!app.should_refresh);
    assert_eq!(app.tick_count, 1);
  }

  #[tokio::test]
  async fn test_on_tick_routing() {
    let mut app = App {
      tick_until_poll: 2,
      tick_count: 2,
      is_routing: true,
      ..App::default()
    };

    app.on_tick(false).await;
    assert!(!app.is_routing);
  }

  #[tokio::test]
  async fn test_on_tick_should_refresh() {
    let mut app = App {
      tick_until_poll: 2,
      tick_count: 2,
      should_refresh: true,
      ..App::default()
    };

    app.on_tick(false).await;
    assert!(!app.should_refresh);
  }

  #[test]
  fn test_radarr_config_default() {
    let radarr_config = RadarrConfig::default();

    assert_str_eq!(radarr_config.host, "localhost");
    assert_eq!(radarr_config.port, Some(7878));
    assert!(radarr_config.api_token.is_empty());
  }
}