/*
 *  SPDX-FileCopyrightText: 2025 April Faye John <april.john@denic.de> & Contributors
 *  SPDX-License-Identifier: AGPL-3.0-or-later
 */

use crate::PMAN_SENDER;
use anyhow::{Ok, Result};
use tokio::process::{Child, Command};
use std::sync::{Arc, Mutex};
use log::{debug, info};
use tokio::sync::mpsc;use tokio::sync::mpsc::Receiver;

pub fn init_process_manager() -> Result<()> {
    let (tx, mut rx) = mpsc::channel::<ProcessCommand>(32);
    let mut process_manager = ProcessManager::default();
    let _ = PMAN_SENDER.set(tx);
    debug!("[pman-main] Spawning pman task");

    tokio::spawn(async move {
        info!("[pman-task] Hello from Pman");
        while process_manager.lifecycle(&mut rx).await.is_ok() {
            let result = process_manager.alive_check().await;
            if let Err(e) = result {
                println!("{}", e);
            }
        }
    });
    Ok(())
}

#[derive(Debug)]
pub struct ProcessManager {
    processes: Vec<Child>,
}

impl Default for ProcessManager {
    fn default() -> ProcessManager {
        ProcessManager {
            processes: Vec::new(),
        }
    }
}

#[derive(Debug)]
pub enum ProcessCommand {
    SpawnShellCmd { cmd: String },
    Shutdown,
}

impl ProcessManager {
    fn spawn_shell_command(&mut self, command: String) {
        if cfg!(target_os = "windows") {
            return self.spawn_cmd_command(command);
        } else if cfg!(target_os = "macos") || cfg!(target_os = "ios") {
            // TODO: reasearch if ios also has zsh
            return self.spawn_zsh_command(command);
        } else {
            return self.spawn_bash_command(command);
        }
    }
    fn spawn_bash_command(&mut self, command: String) {
        let cmd = Command::new("bash")
            .arg("-c")
            .arg(command)
            .spawn().unwrap();
        self.processes.push(cmd);
    }
    fn spawn_cmd_command(&mut self, command: String) {}
    fn spawn_zsh_command(&mut self, command: String) {}
    pub async fn lifecycle(&mut self, rx: &mut Receiver<ProcessCommand>) -> Result<()> {
        let opt = rx.recv().await;
        if let Some(message) = opt {
            match message {
                ProcessCommand::SpawnShellCmd { cmd } => {}
                ProcessCommand::Shutdown => {
                    info!("Close command");
                    anyhow::bail!("Close command");
                }
            }
        } else {
            anyhow::bail!("Channel closed");
        }
        Ok(())
    }
    async fn alive_check(&mut self) -> Result<()> {
        for process in &mut self.processes {
            process.stdout
        }
        Ok(())
    }
}