use std::io::stdin;

use anyhow::{Error, Ok};
use clap::Parser;

#[derive(clap::Parser, Debug)]
// #[clap(version = clap::crate_version!(), author = clap::crate_authors!("\n"))]

/// Hello Remember this is a feature
enum Command {
    Run {
        #[clap(long, short)]
        debug: bool,

        #[clap(long, short, arg_enum)]
        machine: Option<MachineType>,
    },

    Doc {
        #[clap(long, short, arg_enum)]
        machine: Option<MachineType>,
    },

    Mount {
        #[clap(long, short)]
        path: Option<String>,
    },

    Unmount {
        #[clap(long, short)]
        path: Option<String>,
    },
    MakeFS {},
}

#[derive(clap::ArgEnum, Debug, Clone)]
enum MachineType {
    X86,
    Riscv,
    Arm,
}

fn main() -> anyhow::Result<()> {
    let args = Command::parse();

    match args {
        Command::Run { debug, machine } => {
            let _dir = xshell::pushd("./ableos");

            let _debug_log: &[&str] = match debug {
                true => &["-D", "debug.log"],
                false => &[],
            };
            match machine.unwrap_or(MachineType::X86) {
                MachineType::X86 => {
                    xshell::cmd!("cargo run --release").run()?;
                }
                MachineType::Arm => {
                    xshell::cmd!("cargo build --release --target=json_targets/aarch64-ableos.json")
                        .run()?;
                    #[rustfmt::skip]
                    xshell::cmd!(
                        "qemu-system-aarch64
                        -machine virt
                        -m 1024M
                        -cpu cortex-a53
                        -kernel target/aarch64-ableos/release/ableos
                        -device virtio-keyboard
                        "
                    ).run()?;
                }
                MachineType::Riscv => {
                    xshell::cmd!("cargo build --release --target=riscv64gc-unknown-none-elf")
                        .run()?;
                    #[rustfmt::skip]
                    xshell::cmd!(
                        "qemu-system-riscv64
                            -machine virt
                            -cpu rv64
                            -smp 8
                            -m 128M
                            -bios src/arch/riscv/firmwear/opensbi-riscv64-generic-fw_jump.bin
                            -kernel target/riscv64gc-unknown-none-elf/release/ableos 
                            "
                            // -serial stdio
                        ).run()?;
                }
            }
        }

        Command::Doc { machine } => {
            let _dir = xshell::pushd("./ableos");

            match machine.unwrap_or(MachineType::X86) {
                MachineType::X86 => {
                    xshell::cmd!("cargo doc --open").run()?;
                }
                MachineType::Arm => {
                    xshell::cmd!("cargo doc --open --target=json_targets/aarch64-ableos.json")
                        .run()?;
                }
                MachineType::Riscv => {
                    xshell::cmd!("cargo doc --open --target=riscv64gc-unknown-none-elf").run()?;
                }
            }
        }

        Command::Mount { path } => {
            let path = path.unwrap_or_else(|| "./userland/root_fs/mnt".to_string());
            xshell::cmd!("sudo mount userland/root_fs/ext2.img {path}").run()?;
        }

        Command::Unmount { path } => {
            let path = path.unwrap_or_else(|| "./userland/root_fs/mnt".to_string());
            xshell::cmd!("sudo umount {path}").run()?;
        }
        Command::MakeFS {} => match make_fs() {
            Result::Ok(_) => {}
            Err(err) => println!("{}", err),
        },
    }

    Ok(())
}

pub fn make_fs() -> Result<(), Error> {
    xshell::cmd!("sh repbuild/assets/mkfs.sh").run()?;

    println!("Make changes in root_fs");

    let mut input = String::new();
    println!("Press enter when ready:");
    stdin().read_line(&mut input).unwrap();

    // build

    // xshell::cmd!("rm -rf root").run()?;

    Ok(())
}

pub fn make_user(user: String) -> Result<(), Error> {
    xshell::mkdir_p(user)?;

    Ok(())
}