// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
#[macro_use]
extern crate lazy_static;
#[macro_use]
extern crate log;
#[macro_use]
extern crate futures;
#[macro_use]
extern crate serde_json;
extern crate clap;
extern crate deno;
#[cfg(unix)]
extern crate nix;

mod ansi;
pub mod compiler;
pub mod deno_dir;
pub mod errors;
pub mod flags;
mod fs;
mod global_timer;
mod http_body;
mod http_util;
pub mod js_errors;
pub mod msg;
pub mod msg_util;
pub mod ops;
pub mod permissions;
mod repl;
pub mod resolve_addr;
pub mod resources;
mod signal;
mod startup_data;
pub mod state;
mod tokio_util;
mod tokio_write;
pub mod version;
pub mod worker;

use crate::errors::RustOrJsError;
use crate::state::ThreadSafeState;
use crate::worker::root_specifier_to_url;
use crate::worker::Worker;
use deno::v8_set_flags;
use flags::DenoFlags;
use futures::lazy;
use futures::Future;
use log::{LevelFilter, Metadata, Record};
use std::env;

static LOGGER: Logger = Logger;

struct Logger;

impl log::Log for Logger {
  fn enabled(&self, metadata: &Metadata) -> bool {
    metadata.level() <= log::max_level()
  }

  fn log(&self, record: &Record) {
    if self.enabled(record.metadata()) {
      println!("{} RS - {}", record.level(), record.args());
    }
  }
  fn flush(&self) {}
}

fn print_err_and_exit(err: RustOrJsError) {
  eprintln!("{}", err.to_string());
  std::process::exit(1);
}

fn js_check<E>(r: Result<(), E>)
where
  E: Into<RustOrJsError>,
{
  if let Err(err) = r {
    print_err_and_exit(err.into());
  }
}

// TODO(ry) Move this to main.rs
pub fn print_file_info(worker: &Worker, url: &str) {
  let maybe_out =
    worker::fetch_module_meta_data_and_maybe_compile(&worker.state, url, ".");
  if let Err(err) = maybe_out {
    println!("{}", err);
    return;
  }
  let out = maybe_out.unwrap();

  println!("{} {}", ansi::bold("local:".to_string()), &(out.filename));

  println!(
    "{} {}",
    ansi::bold("type:".to_string()),
    msg::enum_name_media_type(out.media_type)
  );

  if out.maybe_output_code_filename.is_some() {
    println!(
      "{} {}",
      ansi::bold("compiled:".to_string()),
      out.maybe_output_code_filename.as_ref().unwrap(),
    );
  }

  if out.maybe_source_map_filename.is_some() {
    println!(
      "{} {}",
      ansi::bold("map:".to_string()),
      out.maybe_source_map_filename.as_ref().unwrap()
    );
  }

  if let Some(deps) = worker.modules.deps(&out.module_name) {
    println!("{}{}", ansi::bold("deps:\n".to_string()), deps.name);
    if let Some(ref depsdeps) = deps.deps {
      for d in depsdeps {
        println!("{}", d);
      }
    }
  } else {
    println!(
      "{} cannot retrieve full dependency graph",
      ansi::bold("deps:".to_string()),
    );
  }
}

fn create_worker_and_state(
  flags: DenoFlags,
  argv: Vec<String>,
) -> (Worker, ThreadSafeState) {
  let state = ThreadSafeState::new(flags, argv, ops::op_selector_std);
  let worker = Worker::new(
    "main".to_string(),
    startup_data::deno_isolate_init(),
    state.clone(),
  );

  (worker, state)
}

fn types_command() {
  let content = include_str!(concat!(
    env!("GN_OUT_DIR"),
    "/gen/cli/lib/lib.deno_runtime.d.ts"
  ));
  println!("{}", content);
}

fn fetch_or_info_command(
  flags: DenoFlags,
  argv: Vec<String>,
  print_info: bool,
) {
  let (mut worker, state) = create_worker_and_state(flags, argv);

  let main_module = state.main_module().unwrap();
  let main_future = lazy(move || {
    // Setup runtime.
    js_check(worker.execute("denoMain()"));
    debug!("main_module {}", main_module);

    let main_url = root_specifier_to_url(&main_module).unwrap();

    worker
      .execute_mod_async(&main_url, true)
      .and_then(move |worker| {
        if print_info {
          print_file_info(&worker, &main_module);
        }
        worker.then(|result| {
          js_check(result);
          Ok(())
        })
      }).map_err(|(err, _worker)| print_err_and_exit(err))
  });
  tokio_util::run(main_future);
}

fn eval_command(flags: DenoFlags, argv: Vec<String>) {
  let (mut worker, state) = create_worker_and_state(flags, argv);
  // Wrap provided script in async function so asynchronous methods
  // work. This is required until top-level await is not supported.
  let js_source = format!(
    "async function _topLevelWrapper(){{
        {}
      }}
      _topLevelWrapper();
      ",
    &state.argv[1]
  );

  let main_future = lazy(move || {
    js_check(worker.execute("denoMain()"));
    // ATM imports in `deno eval` are not allowed
    // TODO Support ES modules once Worker supports evaluating anonymous modules.
    js_check(worker.execute(&js_source));
    worker.then(|result| {
      js_check(result);
      Ok(())
    })
  });
  tokio_util::run(main_future);
}

fn run_repl(flags: DenoFlags, argv: Vec<String>) {
  let (mut worker, _state) = create_worker_and_state(flags, argv);

  // REPL situation.
  let main_future = lazy(move || {
    // Setup runtime.
    js_check(worker.execute("denoMain()"));
    worker
      .then(|result| {
        js_check(result);
        Ok(())
      }).map_err(|(err, _worker): (RustOrJsError, Worker)| {
        print_err_and_exit(err)
      })
  });
  tokio_util::run(main_future);
}

fn run_script(flags: DenoFlags, argv: Vec<String>) {
  let (mut worker, state) = create_worker_and_state(flags, argv);

  let main_module = state.main_module().unwrap();
  // Normal situation of executing a module.
  let main_future = lazy(move || {
    // Setup runtime.
    js_check(worker.execute("denoMain()"));
    debug!("main_module {}", main_module);

    let main_url = root_specifier_to_url(&main_module).unwrap();

    worker
      .execute_mod_async(&main_url, false)
      .and_then(move |worker| {
        worker.then(|result| {
          js_check(result);
          Ok(())
        })
      }).map_err(|(err, _worker)| print_err_and_exit(err))
  });
  tokio_util::run(main_future);
}

fn fmt_command(mut flags: DenoFlags, mut argv: Vec<String>) {
  argv.insert(1, "https://deno.land/std/prettier/main.ts".to_string());
  flags.allow_read = true;
  flags.allow_write = true;
  run_script(flags, argv);
}

fn main() {
  #[cfg(windows)]
  ansi_term::enable_ansi_support().ok(); // For Windows 10

  log::set_logger(&LOGGER).unwrap();
  let args: Vec<String> = env::args().collect();
  let cli_app = flags::create_cli_app();
  let matches = cli_app.get_matches_from(args);
  let flags = flags::parse_flags(matches.clone());
  let mut argv: Vec<String> = vec!["deno".to_string()];

  if flags.v8_help {
    // show v8 help and exit
    v8_set_flags(vec!["--help".to_string()]);
  }

  match &flags.v8_flags {
    Some(v8_flags) => {
      v8_set_flags(v8_flags.clone());
    }
    _ => {}
  };

  log::set_max_level(if flags.log_debug {
    LevelFilter::Debug
  } else {
    LevelFilter::Warn
  });

  match matches.subcommand() {
    ("types", Some(_)) => {
      types_command();
    }
    ("eval", Some(eval_match)) => {
      let code: &str = eval_match.value_of("code").unwrap();
      argv.extend(vec![code.to_string()]);
      eval_command(flags, argv);
    }
    ("info", Some(info_match)) => {
      let file: &str = info_match.value_of("file").unwrap();
      argv.extend(vec![file.to_string()]);
      fetch_or_info_command(flags, argv, true);
    }
    ("fetch", Some(fetch_match)) => {
      let file: &str = fetch_match.value_of("file").unwrap();
      argv.extend(vec![file.to_string()]);
      fetch_or_info_command(flags, argv, false);
    }
    ("fmt", Some(fmt_match)) => {
      let files: Vec<String> = fmt_match
        .values_of("files")
        .unwrap()
        .map(String::from)
        .collect();
      argv.extend(files);
      fmt_command(flags, argv);
    }
    (script, Some(script_match)) => {
      argv.extend(vec![script.to_string()]);
      // check if there are any extra arguments that should
      // be passed to script
      if script_match.is_present("") {
        let script_args: Vec<String> = script_match
          .values_of("")
          .unwrap()
          .map(String::from)
          .collect();
        argv.extend(script_args);
      }
      run_script(flags, argv);
    }
    _ => {
      run_repl(flags, argv);
    }
  }
}