// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.

use deno_core::serde_json;
use deno_core::serde_json::json;
use deno_core::ModuleSpecifier;
use std::thread;

use crate::colors;
use crate::ops::runtime::ppid;

/// Common bootstrap options for MainWorker & WebWorker
#[derive(Clone)]
pub struct BootstrapOptions {
  /// Sets `Deno.args` in JS runtime.
  pub args: Vec<String>,
  pub cpu_count: usize,
  pub debug_flag: bool,
  pub enable_testing_features: bool,
  pub location: Option<ModuleSpecifier>,
  /// Sets `Deno.noColor` in JS runtime.
  pub no_color: bool,
  pub is_tty: bool,
  /// Sets `Deno.version.deno` in JS runtime.
  pub runtime_version: String,
  /// Sets `Deno.version.typescript` in JS runtime.
  pub ts_version: String,
  pub unstable: bool,
  pub user_agent: String,
  pub inspect: bool,
}

impl Default for BootstrapOptions {
  fn default() -> Self {
    let cpu_count = thread::available_parallelism()
      .map(|p| p.get())
      .unwrap_or(1);

    let runtime_version = env!("CARGO_PKG_VERSION").into();
    let user_agent = format!("Deno/{}", runtime_version);

    Self {
      runtime_version,
      user_agent,
      cpu_count,
      no_color: !colors::use_color(),
      is_tty: colors::is_tty(),
      enable_testing_features: Default::default(),
      debug_flag: Default::default(),
      ts_version: Default::default(),
      location: Default::default(),
      unstable: Default::default(),
      inspect: Default::default(),
      args: Default::default(),
    }
  }
}

impl BootstrapOptions {
  pub fn as_json(&self) -> String {
    let payload = json!({
      // Shared bootstrap args
      "args": self.args,
      "cpuCount": self.cpu_count,
      "debugFlag": self.debug_flag,
      "denoVersion": self.runtime_version,
      "location": self.location,
      "noColor": self.no_color,
      "isTty": self.is_tty,
      "tsVersion": self.ts_version,
      "unstableFlag": self.unstable,
      // Web worker only
      "enableTestingFeaturesFlag": self.enable_testing_features,
      // Env values
      "pid": std::process::id(),
      "ppid": ppid(),
      "target": env!("TARGET"),
      "v8Version": deno_core::v8_version(),
      "userAgent": self.user_agent,
      "inspectFlag": self.inspect,
    });
    serde_json::to_string_pretty(&payload).unwrap()
  }
}