ethers_hardhat 0.2.2

use std::env;
use std::fs::canonicalize;
use std::io::ErrorKind;
use std::marker::PhantomData;
use std::path::PathBuf;

use async_process::Child;
use async_process::Command;
use async_process::ExitStatus;

use ethers_provider::providers::http;
use ethers_provider::Provider;
use ethers_signer::signer::Signer;
use ethers_signer::wallet::WalletSigner;
use ethers_wallet::{hd_wallet::bip32::DriveKey, wallet::Wallet};
use futures::executor::block_on;
use futures::executor::ThreadPool;
use once_cell::sync::OnceCell;

use crate::error::HardhatError;

/// Kill process and all children processess by process id
#[cfg(target_family = "unix")]
pub async fn kill_process_recursive(process_id: u32) -> anyhow::Result<ExitStatus> {
    let mut child = Command::new("kill")
        .arg(format!("{}", process_id))
        .spawn()?;

    Ok(child.status().await?)
}

/// Returns hardhat base command instance
pub fn hardhat_command<P>(hardhat_root: P) -> anyhow::Result<Command>
where
    P: Into<PathBuf>,
{
    let mut command = Command::new("npx");

    command.arg("hardhat");

    command.current_dir(hardhat_root.into());

    Ok(command)
}

/// Get global thread pool for async task to executing.
pub fn thread_pool() -> &'static ThreadPool {
    static POOLS: OnceCell<ThreadPool> = OnceCell::new();

    POOLS.get_or_init(|| ThreadPool::new().unwrap())
}
/// Find the nearest cargo manifest dir.
pub fn find_manifest_dir() -> anyhow::Result<PathBuf> {
    let start_dir = env::current_dir()?;

    fn search(start_dir: PathBuf) -> anyhow::Result<PathBuf> {
        log::trace!(target:"HARDHAT","Search manifest file in {}",start_dir.to_string_lossy());

        for item in start_dir.read_dir()? {
            if let Ok(item) = item {
                if item.path().is_dir() {
                    continue;
                }

                if item.file_name() == "Cargo.toml" {
                    let path = canonicalize(start_dir)?;

                    log::trace!(target:"HARDHAT","found cargo manifest dir, {}",path.to_string_lossy());

                    return Ok(path);
                }
            }
        }

        if let Some(parent) = start_dir.parent() {
            return search(parent.to_path_buf());
        }

        Err(HardhatError::CargoManifestDirNotFound.into())
    }

    search(start_dir)
}

/// Returns the hardhat project default path `$CARGO_MANIFEST_DIR/hardhat`
pub fn hardhat_default_path() -> anyhow::Result<PathBuf> {
    find_manifest_dir().map(|p| p.join("sol"))
}

#[async_trait::async_trait]
pub trait HardhatCommandContext {
    /// Execute hardhat command in current_path `hardhat_root`
    ///
    #[allow(unused)]
    fn init_command(hardhat_root: PathBuf, c: &mut Command) -> anyhow::Result<()> {
        Ok(())
    }

    #[allow(unused)]
    async fn start_command(c: &mut Child) -> anyhow::Result<()> {
        Ok(())
    }

    #[allow(unused)]
    async fn drop_command(hardhat_root: PathBuf) -> anyhow::Result<()> {
        Ok(())
    }
}

#[derive(Debug)]
pub struct HardhatCommand<C: HardhatCommandContext> {
    hardhat_root: PathBuf,
    /// hardhat network startup command
    command: Command,
    /// Started hardhat network process
    child_process: Option<Child>,

    _marked: PhantomData<C>,
}

impl<C> HardhatCommand<C>
where
    C: HardhatCommandContext,
{
    pub fn new() -> anyhow::Result<Self> {
        Self::new_with(hardhat_default_path()?)
    }
    /// Create new hardhat network instance with hardhat project root path.
    pub fn new_with<P>(hardhat_root: P) -> anyhow::Result<Self>
    where
        P: Into<PathBuf>,
    {
        let hardhat_root: PathBuf = hardhat_root.into();

        log::debug!("hardhat start in directory: {:?}", hardhat_root);

        let mut command = hardhat_command(hardhat_root.clone())?;

        C::init_command(hardhat_root.clone(), &mut command)?;

        Ok(Self {
            hardhat_root,
            child_process: None,
            command,
            _marked: Default::default(),
        })
    }

    /// Returns if network started.
    pub fn is_started(&self) -> bool {
        self.child_process.is_some()
    }

    /// Start hardhat network child process.
    ///
    /// If already started, returns false.
    pub async fn start(&mut self) -> anyhow::Result<bool> {
        if self.is_started() {
            return Ok(false);
        }

        let mut child = match self.command.spawn() {
            Ok(child) => child,
            Err(err) => {
                if err.kind() == ErrorKind::NotFound {
                    return Err(HardhatError::NodejsRequired.into());
                } else {
                    return Err(err.into());
                }
            }
        };

        C::start_command(&mut child).await?;

        self.child_process = Some(child);

        return Ok(true);
    }

    /// Stop hardhat network.
    ///
    /// If hardhat network already stopped, returns [`HardhatError::HardhatNetworkStopped`]
    pub async fn stop(&mut self) -> anyhow::Result<()> {
        if let Some(child_process) = self.child_process.take() {
            kill_process_recursive(child_process.id()).await?;
            Ok(())
        } else {
            Err(HardhatError::HardhatNetworkStopped.into())
        }
    }

    /// Wait until child process stopped and returns status code.
    pub async fn status(&mut self) -> anyhow::Result<ExitStatus> {
        if let Some(mut child_process) = self.child_process.take() {
            Ok(child_process.status().await?)
        } else {
            Err(HardhatError::HardhatNetworkStopped.into())
        }
    }
}

impl<C> Drop for HardhatCommand<C>
where
    C: HardhatCommandContext,
{
    fn drop(&mut self) {
        if self.is_started() {
            let child_process = self.child_process.take().unwrap();
            let hardhat_root = self.hardhat_root.clone();

            block_on(async move {
                let drop_result = C::drop_command(hardhat_root).await;

                log::debug!("drop command result, {:?}", drop_result);

                _ = kill_process_recursive(child_process.id()).await;
            });
        }
    }
}

/// Get hardhat builtin accounts
pub fn get_hardhat_network_account(i: usize) -> Signer {
    let drive_key = DriveKey::new(
        "test test test test test test test test test test test junk",
        "",
    );
    let key = drive_key
        .drive(format!("m/44'/60'/0'/0/{}", i))
        .expect("Bip32 drive key");

    Wallet::new(key)
        .expect("Create wallet")
        .try_into_signer()
        .expect("Create signer error")
}

/// Get hardhat default provider
pub fn get_hardhat_network_provider() -> Provider {
    http::connect_to("http://localhost:8545")
}

#[cfg(test)]
mod tests {

    use super::find_manifest_dir;

    #[test]
    fn test_manifest_dir() {
        _ = pretty_env_logger::try_init();

        log::debug!("{:?}", find_manifest_dir().expect("find manifest dir"));
    }
}