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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use crate::colors;use deno_core::parking_lot::Mutex;use indexmap::IndexSet;use std::sync::Arc;use std::time::Duration;
#[derive(Clone, Debug, Default)]pub struct ProgressBar(Arc<Mutex<ProgressBarInner>>);
#[derive(Debug)]struct ProgressBarInner {  pb: Option<indicatif::ProgressBar>,  is_tty: bool,  in_flight: IndexSet<String>,}
impl Default for ProgressBarInner {  fn default() -> Self {    Self {      pb: None,      is_tty: colors::is_tty(),      in_flight: IndexSet::default(),    }  }}
impl ProgressBarInner {  fn get_or_create_pb(&mut self) -> indicatif::ProgressBar {    if let Some(pb) = self.pb.as_ref() {      return pb.clone();    }
    let pb = indicatif::ProgressBar::new_spinner();    pb.enable_steady_tick(Duration::from_millis(120));    pb.set_prefix("Download");    pb.set_style(      indicatif::ProgressStyle::with_template(        "{prefix:.green} {spinner:.green} {msg}",      )      .unwrap()      .tick_strings(&["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"]),    );    self.pb = Some(pb);    self.pb.as_ref().unwrap().clone()  }
  fn add_in_flight(&mut self, msg: &str) {    if self.in_flight.contains(msg) {      return;    }
    self.in_flight.insert(msg.to_string());  }
  /// Returns if removed "in-flight" was last entry and progress  /// bar needs to be updated.  fn remove_in_flight(&mut self, msg: &str) -> bool {    if !self.in_flight.contains(msg) {      return false;    }
    let mut is_last = false;    if let Some(last) = self.in_flight.last() {      is_last = last == msg;    }    self.in_flight.remove(msg);    is_last  }
  fn update_progress_bar(&mut self) {    let pb = self.get_or_create_pb();    if let Some(msg) = self.in_flight.last() {      pb.set_message(msg.clone());    }  }}
pub struct UpdateGuard {  pb: ProgressBar,  msg: String,  noop: bool,}
impl Drop for UpdateGuard {  fn drop(&mut self) {    if self.noop {      return;    }
    let mut inner = self.pb.0.lock();    if inner.remove_in_flight(&self.msg) {      inner.update_progress_bar();    }  }}
impl ProgressBar {  pub fn update(&self, msg: &str) -> UpdateGuard {    let mut guard = UpdateGuard {      pb: self.clone(),      msg: msg.to_string(),      noop: false,    };    let mut inner = self.0.lock();
    // If we're not running in TTY we're just gonna fallback    // to using logger crate.    if !inner.is_tty {      log::log!(log::Level::Info, "{} {}", colors::green("Download"), msg);      guard.noop = true;      return guard;    }
    inner.add_in_flight(msg);    inner.update_progress_bar();    guard  }
  pub fn clear(&self) {    let mut inner = self.0.lock();
    if let Some(pb) = inner.pb.as_ref() {      pb.finish_and_clear();      inner.pb = None;    }  }
  pub fn clear_guard(&self) -> ClearGuard {    ClearGuard { pb: self.clone() }  }}
pub struct ClearGuard {  pb: ProgressBar,}
impl Drop for ClearGuard {  fn drop(&mut self) {    self.pb.clear();  }}