use crate::Nostr;
use keyring::Entry;
use keyring_search::{Limit, List, Search};
use nostr_sdk::prelude::*;
use serde::Serialize;
use specta::Type;
use std::str::FromStr;
use std::time::Duration;
use tauri::{EventTarget, Manager, State};
use tauri_plugin_notification::NotificationExt;

#[derive(Serialize, Type)]
pub struct Account {
  npub: String,
  nsec: String,
}

#[tauri::command]
#[specta::specta]
pub fn get_accounts() -> Result<Vec<String>, String> {
  let search = Search::new().unwrap();
  let results = search.by("Account", "nostr_secret");

  match List::list_credentials(results, Limit::All) {
    Ok(list) => {
      let search: Vec<String> = list
        .split_whitespace()
        .map(|v| v.to_string())
        .filter(|v| v.starts_with("npub1"))
        .collect();

      let accounts: Vec<String> = search
        .into_iter()
        .collect::<std::collections::HashSet<_>>()
        .into_iter()
        .collect();

      Ok(accounts)
    }
    Err(_) => Err("Empty.".into()),
  }
}

#[tauri::command]
#[specta::specta]
pub fn create_account() -> Result<Account, ()> {
  let keys = Keys::generate();
  let public_key = keys.public_key();
  let secret_key = keys.secret_key().unwrap();

  let result = Account {
    npub: public_key.to_bech32().unwrap(),
    nsec: secret_key.to_bech32().unwrap(),
  };

  Ok(result)
}

#[tauri::command]
#[specta::specta]
pub async fn save_account(
  nsec: &str,
  password: &str,
  state: State<'_, Nostr>,
) -> Result<String, String> {
  let secret_key: Result<SecretKey, String>;

  if nsec.starts_with("ncryptsec") {
    let encrypted_key = EncryptedSecretKey::from_bech32(nsec).unwrap();
    secret_key = match encrypted_key.to_secret_key(password) {
      Ok(val) => Ok(val),
      Err(err) => Err(err.to_string()),
    };
  } else {
    secret_key = match SecretKey::from_bech32(nsec) {
      Ok(val) => Ok(val),
      Err(err) => Err(err.to_string()),
    }
  }

  match secret_key {
    Ok(val) => {
      let nostr_keys = Keys::new(val);
      let npub = nostr_keys.public_key().to_bech32().unwrap();
      let nsec = nostr_keys.secret_key().unwrap().to_bech32().unwrap();

      let keyring = Entry::new(&npub, "nostr_secret").unwrap();
      let _ = keyring.set_password(&nsec);

      let signer = NostrSigner::Keys(nostr_keys);
      let client = &state.client;

      // Update client's signer
      client.set_signer(Some(signer)).await;

      Ok(npub)
    }
    Err(msg) => Err(msg),
  }
}

#[tauri::command]
#[specta::specta]
pub async fn load_account(
  npub: &str,
  bunker: Option<&str>,
  state: State<'_, Nostr>,
  app: tauri::AppHandle,
) -> Result<bool, String> {
  let handle = app.clone();
  let client = &state.client;
  let keyring = Entry::new(npub, "nostr_secret").unwrap();

  if let Ok(password) = keyring.get_password() {
    match bunker {
      Some(uri) => {
        let app_keys = Keys::parse(password).expect("Secret Key is modified, please check again.");

        match NostrConnectURI::parse(uri) {
          Ok(bunker_uri) => {
            match Nip46Signer::new(bunker_uri, app_keys, Duration::from_secs(30), None).await {
              Ok(signer) => client.set_signer(Some(signer.into())).await,
              Err(err) => return Err(err.to_string()),
            }
          }
          Err(err) => return Err(err.to_string()),
        }
      }
      None => {
        let keys = Keys::parse(password).expect("Secret Key is modified, please check again.");
        let signer = NostrSigner::Keys(keys);

        // Update signer
        client.set_signer(Some(signer)).await;
      }
    }

    // Verify signer
    let signer = client.signer().await.unwrap();
    let public_key = signer.public_key().await.unwrap();

    let filter = Filter::new()
      .author(public_key)
      .kind(Kind::RelayList)
      .limit(1);

    // Connect to user's relay (NIP-65)
    // #TODO: Let rust-nostr handle it
    if let Ok(events) = client
      .get_events_of(vec![filter], Some(Duration::from_secs(10)))
      .await
    {
      if let Some(event) = events.first() {
        let relay_list = nip65::extract_relay_list(event);
        for item in relay_list.into_iter() {
          println!("connecting to relay: {} - {:?}", item.0, item.1);

          let relay_url = item.0.to_string();
          let opts = match item.1 {
            Some(val) => {
              if val == &RelayMetadata::Read {
                RelayOptions::new().read(true).write(false)
              } else {
                RelayOptions::new().write(true).read(false)
              }
            }
            None => RelayOptions::new(),
          };

          // Add relay to relay pool
          let _ = client
            .add_relay_with_opts(&relay_url, opts)
            .await
            .unwrap_or_default();

          // Connect relay
          client.connect_relay(relay_url).await.unwrap_or_default();
        }
      }
    };

    // Run sync service
    tauri::async_runtime::spawn(async move {
      let window = handle.get_window("main").unwrap();
      let state = window.state::<Nostr>();
      let client = &state.client;

      let filter = Filter::new()
        .pubkey(public_key)
        .kinds(vec![
          Kind::TextNote,
          Kind::Repost,
          Kind::Reaction,
          Kind::ZapReceipt,
        ])
        .limit(500);

      match client.reconcile(filter, NegentropyOptions::default()).await {
        Ok(_) => println!("Sync notification done."),
        Err(_) => println!("Sync notification failed."),
      }
    });

    // Run notification service
    tauri::async_runtime::spawn(async move {
      println!("Starting notification service...");

      let window = app.get_window("main").unwrap();
      let state = window.state::<Nostr>();
      let client = &state.client;

      // Create a subscription for notification
      let notification_id = SubscriptionId::new("notification");
      let filter = Filter::new()
        .pubkey(public_key)
        .kinds(vec![
          Kind::TextNote,
          Kind::Repost,
          Kind::Reaction,
          Kind::ZapReceipt,
        ])
        .since(Timestamp::now());

      // Subscribe
      client
        .subscribe_with_id(notification_id.clone(), vec![filter], None)
        .await;

      // Handle notifications
      let _ = client
        .handle_notifications(|notification| async {
          if let RelayPoolNotification::Event {
            subscription_id,
            event,
            ..
          } = notification
          {
            if subscription_id == notification_id {
              println!("new notification: {}", event.as_json());

              if let Err(_) = app.emit_to(
                EventTarget::window("panel"),
                "notification",
                event.as_json(),
              ) {
                println!("Emit new notification failed.")
              }

              let handle = app.app_handle();
              let author = client.metadata(event.pubkey).await.unwrap();

              match event.kind() {
                Kind::TextNote => {
                  if let Err(e) = handle
                    .notification()
                    .builder()
                    .body("Mentioned you in a thread.")
                    .title(author.display_name.unwrap_or_else(|| "Lume".to_string()))
                    .show()
                  {
                    println!("Failed to show notification: {:?}", e);
                  }
                }
                Kind::Repost => {
                  if let Err(e) = handle
                    .notification()
                    .builder()
                    .body("Reposted your note.")
                    .title(author.display_name.unwrap_or_else(|| "Lume".to_string()))
                    .show()
                  {
                    println!("Failed to show notification: {:?}", e);
                  }
                }
                Kind::Reaction => {
                  let content = event.content();
                  if let Err(e) = handle
                    .notification()
                    .builder()
                    .body(content)
                    .title(author.display_name.unwrap_or_else(|| "Lume".to_string()))
                    .show()
                  {
                    println!("Failed to show notification: {:?}", e);
                  }
                }
                Kind::ZapReceipt => {
                  if let Err(e) = handle
                    .notification()
                    .builder()
                    .body("Zapped you.")
                    .title(author.display_name.unwrap_or_else(|| "Lume".to_string()))
                    .show()
                  {
                    println!("Failed to show notification: {:?}", e);
                  }
                }
                _ => {}
              }
            }
          }
          Ok(false)
        })
        .await;
    });

    Ok(true)
  } else {
    Err("Key not found.".into())
  }
}

#[tauri::command]
#[specta::specta]
pub async fn connect_remote_account(uri: &str, state: State<'_, Nostr>) -> Result<String, String> {
  let client = &state.client;

  match NostrConnectURI::parse(uri) {
    Ok(bunker_uri) => {
      let app_keys = Keys::generate();
      let app_secret = app_keys.secret_key().unwrap().to_string();

      // Get remote user
      let remote_user = bunker_uri.signer_public_key().unwrap();
      let remote_npub = remote_user.to_bech32().unwrap();

      match Nip46Signer::new(bunker_uri, app_keys, Duration::from_secs(120), None).await {
        Ok(signer) => {
          let keyring = Entry::new(&remote_npub, "nostr_secret").unwrap();
          let _ = keyring.set_password(&app_secret);

          // Update signer
          let _ = client.set_signer(Some(signer.into())).await;

          Ok(remote_npub)
        }
        Err(err) => Err(err.to_string()),
      }
    }
    Err(err) => Err(err.to_string()),
  }
}

#[tauri::command(async)]
#[specta::specta]
pub fn get_encrypted_key(npub: &str, password: &str) -> Result<String, String> {
  let keyring = Entry::new(npub, "nostr_secret").unwrap();

  if let Ok(nsec) = keyring.get_password() {
    let secret_key = SecretKey::from_bech32(nsec).unwrap();
    let new_key = EncryptedSecretKey::new(&secret_key, password, 16, KeySecurity::Medium);

    if let Ok(key) = new_key {
      Ok(key.to_bech32().unwrap())
    } else {
      Err("Encrypt key failed".into())
    }
  } else {
    Err("Key not found".into())
  }
}

#[tauri::command]
#[specta::specta]
pub fn event_to_bech32(id: &str, relays: Vec<String>) -> Result<String, ()> {
  let event_id = EventId::from_hex(id).unwrap();
  let event = Nip19Event::new(event_id, relays);

  Ok(event.to_bech32().unwrap())
}

#[tauri::command]
#[specta::specta]
pub fn user_to_bech32(key: &str, relays: Vec<String>) -> Result<String, ()> {
  let pubkey = PublicKey::from_str(key).unwrap();
  let profile = Nip19Profile::new(pubkey, relays).unwrap();

  Ok(profile.to_bech32().unwrap())
}

#[tauri::command]
#[specta::specta]
pub async fn verify_nip05(key: &str, nip05: &str) -> Result<bool, String> {
  match PublicKey::from_str(key) {
    Ok(public_key) => {
      let status = nip05::verify(&public_key, nip05, None).await;
      Ok(status.is_ok())
    }
    Err(err) => Err(err.to_string()),
  }
}