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

use crate::permissions::Permissions;
use deno_core::anyhow::Context;
use deno_core::error::AnyError;
use deno_core::op;
use deno_core::Extension;
use deno_core::ModuleSpecifier;
use deno_core::OpState;

pub fn init(main_module: ModuleSpecifier) -> Extension {
    Extension::builder()
        .ops(vec![op_main_module::decl()])
        .state(move |state| {
            state.put::<ModuleSpecifier>(main_module.clone());
            Ok(())
        })
        .build()
}

#[op]
fn op_main_module(state: &mut OpState) -> Result<String, AnyError> {
    let main = state.borrow::<ModuleSpecifier>().to_string();
    let main_url = deno_core::resolve_url_or_path(&main)?;
    if main_url.scheme() == "file" {
        let main_path = std::env::current_dir()
            .context("Failed to get current working directory")?
            .join(main_url.to_string());
        state
            .borrow_mut::<Permissions>()
            .read
            .check_blind(&main_path, "main_module")?;
    }
    Ok(main)
}

pub fn ppid() -> i64 {
    #[cfg(windows)]
    {
        // Adopted from rustup:
        // https://github.com/rust-lang/rustup/blob/1.21.1/src/cli/self_update.rs#L1036
        // Copyright Diggory Blake, the Mozilla Corporation, and rustup contributors.
        // Licensed under either of
        // - Apache License, Version 2.0
        // - MIT license
        use std::mem;
        use winapi::shared::minwindef::DWORD;
        use winapi::um::handleapi::{CloseHandle, INVALID_HANDLE_VALUE};
        use winapi::um::processthreadsapi::GetCurrentProcessId;
        use winapi::um::tlhelp32::{
            CreateToolhelp32Snapshot, Process32First, Process32Next, PROCESSENTRY32,
            TH32CS_SNAPPROCESS,
        };
        unsafe {
            // Take a snapshot of system processes, one of which is ours
            // and contains our parent's pid
            let snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
            if snapshot == INVALID_HANDLE_VALUE {
                return -1;
            }

            let mut entry: PROCESSENTRY32 = mem::zeroed();
            entry.dwSize = mem::size_of::<PROCESSENTRY32>() as DWORD;

            // Iterate over system processes looking for ours
            let success = Process32First(snapshot, &mut entry);
            if success == 0 {
                CloseHandle(snapshot);
                return -1;
            }

            let this_pid = GetCurrentProcessId();
            while entry.th32ProcessID != this_pid {
                let success = Process32Next(snapshot, &mut entry);
                if success == 0 {
                    CloseHandle(snapshot);
                    return -1;
                }
            }
            CloseHandle(snapshot);

            // FIXME: Using the process ID exposes a race condition
            // wherein the parent process already exited and the OS
            // reassigned its ID.
            let parent_id = entry.th32ParentProcessID;
            parent_id.into()
        }
    }
    #[cfg(not(windows))]
    {
        use std::os::unix::process::parent_id;
        parent_id().into()
    }
}