// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.

use deno_core::op2;
use deno_core::OpState;
use deno_terminal::colors::ColorLevel;
use serde::Serialize;

use crate::BootstrapOptions;

deno_core::extension!(
  deno_bootstrap,
  ops = [
    op_bootstrap_args,
    op_bootstrap_pid,
    op_bootstrap_numcpus,
    op_bootstrap_user_agent,
    op_bootstrap_language,
    op_bootstrap_log_level,
    op_bootstrap_no_color,
    op_bootstrap_color_depth,
    op_bootstrap_is_stdout_tty,
    op_bootstrap_is_stderr_tty,
    op_bootstrap_unstable_args,
    op_snapshot_options,
  ],
  options = {
    snapshot_options: Option<SnapshotOptions>,
  },
  state = |state, options| {
    if let Some(snapshot_options) = options.snapshot_options {
      state.put::<SnapshotOptions>(snapshot_options);
    }
  },
);

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
pub struct SnapshotOptions {
  pub ts_version: String,
  pub v8_version: &'static str,
  pub target: String,
}

impl Default for SnapshotOptions {
  fn default() -> Self {
    let arch = std::env::consts::ARCH;
    let platform = std::env::consts::OS;
    let target = match platform {
      "macos" => format!("{}-apple-darwin", arch),
      "linux" => format!("{}-unknown-linux-gnu", arch),
      "windows" => format!("{}-pc-windows-msvc", arch),
      rest => format!("{}-{}", arch, rest),
    };

    Self {
      ts_version: "n/a".to_owned(),
      v8_version: deno_core::v8::VERSION_STRING,
      target,
    }
  }
}

// Note: Called at snapshot time, op perf is not a concern.
#[op2]
#[serde]
pub fn op_snapshot_options(state: &mut OpState) -> SnapshotOptions {
  state.take::<SnapshotOptions>()
}

#[op2]
#[serde]
pub fn op_bootstrap_args(state: &mut OpState) -> Vec<String> {
  state.borrow::<BootstrapOptions>().args.clone()
}

#[op2(fast)]
#[smi]
pub fn op_bootstrap_pid() -> u32 {
  std::process::id()
}

#[op2(fast)]
#[smi]
pub fn op_bootstrap_numcpus(state: &mut OpState) -> u32 {
  state.borrow::<BootstrapOptions>().cpu_count as u32
}

#[op2]
#[string]
pub fn op_bootstrap_user_agent(state: &mut OpState) -> String {
  state.borrow::<BootstrapOptions>().user_agent.clone()
}

#[op2]
#[serde]
pub fn op_bootstrap_unstable_args(state: &mut OpState) -> Vec<String> {
  let options = state.borrow::<BootstrapOptions>();
  let mut flags = Vec::with_capacity(options.unstable_features.len());
  for granular_flag in crate::UNSTABLE_GRANULAR_FLAGS.iter() {
    if options.unstable_features.contains(&granular_flag.id) {
      flags.push(format!("--unstable-{}", granular_flag.name));
    }
  }
  flags
}

#[op2]
#[string]
pub fn op_bootstrap_language(state: &mut OpState) -> String {
  state.borrow::<BootstrapOptions>().locale.clone()
}

#[op2(fast)]
#[smi]
pub fn op_bootstrap_log_level(state: &mut OpState) -> i32 {
  state.borrow::<BootstrapOptions>().log_level as i32
}

#[op2(fast)]
pub fn op_bootstrap_no_color(state: &mut OpState) -> bool {
  let options = state.borrow::<BootstrapOptions>();
  options.no_color
}

#[op2(fast)]
pub fn op_bootstrap_color_depth(state: &mut OpState) -> i32 {
  let options = state.borrow::<BootstrapOptions>();
  match options.color_level {
    ColorLevel::None => 1,
    ColorLevel::Ansi => 4,
    ColorLevel::Ansi256 => 8,
    ColorLevel::TrueColor => 24,
  }
}

#[op2(fast)]
pub fn op_bootstrap_is_stdout_tty(state: &mut OpState) -> bool {
  let options = state.borrow::<BootstrapOptions>();
  options.is_stdout_tty
}

#[op2(fast)]
pub fn op_bootstrap_is_stderr_tty(state: &mut OpState) -> bool {
  let options = state.borrow::<BootstrapOptions>();
  options.is_stderr_tty
}