/*
 * Copyright (c) 2022, Umut İnan Erdoğan <umutinanerdogan@pm.me>
 * Copyright (c) 2022, able <abl3theabove@gmail.com>
 *
 * SPDX-License-Identifier: MPL-2.0
 */

use std::{fs, process::Command};

use colored::*;

struct Options {
    pub subcommand: Subcommand,
    pub arguments: Vec<String>,
}

enum Subcommand {
    Doc,
    Help,
    Run,
    Empty,
    /// Run all tests for all architectures
    Test,
    Unknown(String),
}

impl Subcommand {
    fn from_str<S: AsRef<str>>(str: S) -> Subcommand {
        match str.as_ref() {
            "doc" => Subcommand::Doc,
            "help" => Subcommand::Help,
            "run" | "r" => Subcommand::Run,
            "test" | "t" => Subcommand::Test,
            "" => Subcommand::Empty,
            unknown => Subcommand::Unknown(unknown.to_string()),
        }
    }
}

enum MachineType {
    X86_64,
    RiscV64,
    AArch64,
    Unknown(String),
}

fn main() {
    let options = options();

    match options.subcommand {
        Subcommand::Test => {
            Command::new("cargo")
                .args(["test", "--target=json_targets/x86_64-ableos.json"])
                .current_dir(fs::canonicalize("./ableos").unwrap())
                .status()
                .unwrap();

            // panic!("Test Infrastructure missing");
        }
        Subcommand::Doc => {
            let machine_text = options.arguments.get(0).cloned().unwrap_or_default();

            match machine(machine_text) {
                MachineType::X86_64 => {
                    Command::new("cargo")
                        .args(["doc", "--open"])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();
                }
                MachineType::RiscV64 => {
                    Command::new("cargo")
                        .args(["doc", "--open", "--target=riscv64gc-unknown-none-elf"])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();
                }
                MachineType::AArch64 => {
                    Command::new("cargo")
                        .args(["doc", "--open", "--target=json_targets/aarch64-ableos.json"])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();
                }
                MachineType::Unknown(unknown) => {
                    eprintln!(
                        "{}: unknown machine type `{}`",
                        "error".red().bold(),
                        unknown.bold(),
                    );
                    eprintln!("expected one of x86_64, riscv64 or aarch64");
                }
            }
        }
        Subcommand::Help => help(),
        Subcommand::Run => {
            let machine_text = options.arguments.get(0).cloned().unwrap_or_default();
            let debug = options.arguments.get(1).cloned().unwrap_or_default();
            let debug = matches!(debug.as_str(), "--debug" | "--dbg" | "-d");

            match machine(machine_text) {
                MachineType::X86_64 if debug => {
                    Command::new("cargo")
                        .args(["run", "--", "-S", "-gdb", "tcp:9000"])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();
                }
                MachineType::X86_64 => {
                    Command::new("cargo")
                        .args(["run", "--release"])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();
                }
                MachineType::RiscV64 if debug => {
                    eprintln!(
                        "{}: debug is not implemented for riscv64",
                        "error".red().bold()
                    );
                }
                MachineType::RiscV64 => {
                    Command::new("cargo")
                        .args(["build", "--release", "--target=riscv64gc-unknown-none-elf"])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();

                    Command::new("qemu-system-riscv64")
                        .args(["-machine", "virt"])
                        .args(["-cpu", "rv64"])
                        .args(["-smp", "8"])
                        .args(["-m", "128M"])
                        .arg("-bios")
                        .arg("src/arch/riscv/firmwear/opensbi-riscv64-generic-fw_jump.bin")
                        .arg("-kernel")
                        .arg("target/riscv64gc-unknown-none-elf/release/ableos")
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();
                }
                MachineType::AArch64 if debug => {
                    eprintln!(
                        "{}: debug is not implemented for aarch64",
                        "error".red().bold()
                    );
                }
                MachineType::AArch64 => {
                    Command::new("cargo")
                        .args([
                            "build",
                            "--release",
                            "--target=json_targets/aarch64-ableos.json",
                        ])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();

                    Command::new("qemu-system-aarch64")
                        .args(["-machine", "virt"])
                        .args(["-m", "1024M"])
                        .args(["-cpu", "cortex-a53"])
                        .args(["-kernel", "target/aarch64-ableos/release/ableos"])
                        .args(["-device", "virtio-keyboard"])
                        .current_dir(fs::canonicalize("./ableos").unwrap())
                        .status()
                        .unwrap();
                }
                MachineType::Unknown(unknown) => {
                    eprintln!(
                        "{}: unknown machine type `{}`",
                        "error".red().bold(),
                        unknown.bold(),
                    );
                    eprintln!("expected one of x86_64, riscv64 or aarch64");
                }
            }
        }
        Subcommand::Empty => {
            eprintln!("{}: no subcommand passed", "error".red().bold());
            help();
        }
        Subcommand::Unknown(unknown) => {
            eprintln!(
                "{}: unknown subcommand `{}`",
                "error".red().bold(),
                unknown.bold()
            );
            help();
        }
    }
}

fn options() -> Options {
    let subcommand = std::env::args().nth(1).unwrap_or_default();
    let arguments = std::env::args().skip(2).collect();

    Options {
        subcommand: Subcommand::from_str(subcommand),
        arguments,
    }
}

fn machine<S: AsRef<str>>(text: S) -> MachineType {
    match text.as_ref() {
        "x86" | "x86_64" => MachineType::X86_64,
        "riscv" | "riscv64" => MachineType::RiscV64,
        "arm" | "arm64" | "aarch64" => MachineType::AArch64,
        "" => {
            eprintln!(
                "{}: no machine type passed, defaulting to x86_64",
                "warning".yellow().bold()
            );
            MachineType::X86_64
        }
        unknown => MachineType::Unknown(unknown.to_string()),
    }
}

fn help() {
    todo!("`help`")
}