use core::alloc::Layout;

use crate::arch::interrupts::{reset_pit_for_cpu, set_pit_2};
use crate::devices::{pci, pci_inner};
use crate::encoding::bin;
use crate::port_io::{read32, read8, write8};
use crate::rhai_shell::shell;
use crate::wasm_jumploader::run_program;
use acpi::{AcpiTables, PlatformInfo};
use cpuio::outb;
use genfs::Fs;

/// Experimental scratchpad for testing.
pub fn scratchpad() {
    let axel_raw = "kernel{
    vals=
        time: 123
    fn|
        print: (None) -> (None);
        foo: (None) -> (Num); 
}";
    let axel = axel::parse(axel_raw.to_string());

    for node in axel {
        info!("{:?}", node);
    }

    use crate::devices::pci::brute_force_scan;
    let infos = brute_force_scan();
    for device in infos {
        match device.vendor_id {
            0x1af4 => {
                info!("Found virtio device");
                use crate::virtio::device_handler;
                device_handler(device);
            }
            _ => {
                info!("Found unknown device");
            }
        }
    }

    // sound(1000);
    // sound_off();

    // acpi();
    real_shell();
}
use crate::port_io::write16;

pub fn acpi() {
    let acpi_handler = AcpiStruct {};
    let _table;
    unsafe {
        _table = AcpiTables::search_for_rsdp_bios(acpi_handler);
    }
    match _table.unwrap().platform_info().unwrap() {
        PlatformInfo {
            power_profile,
            interrupt_model,
            processor_info,
            pm_timer,
        } => {
            info!("{:?}", power_profile);
            info!("{:?}", interrupt_model);
            // info!("{:?}", processor_info.unwrap());
            // info!("{:?}", pm_timer.unwrap());
        }

        _ => todo!(),
    }
}
// TODO: move to a better place
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct AcpiStruct {}
impl acpi::AcpiHandler for AcpiStruct {
    unsafe fn map_physical_region<T>(
        &self,
        physical_address: usize,
        size: usize,
    ) -> acpi::PhysicalMapping<Self, T> {
        info!("PHYS ADDR: {:?}", physical_address);
        info!("Size: {:?}", size);
        todo!("map_physical_region");
    }
    fn unmap_physical_region<T>(_region: &acpi::PhysicalMapping<Self, T>) {
        todo!("unmap_physical_region");
    }
}

pub fn real_shell() {
    let _current_dir = "/".to_string();
    let current_user = "able".to_string();

    let mut buf = String::new();
    print!("> ");

    loop {
        match x86_64::instructions::interrupts::without_interrupts(|| KEYBUFF.lock().pop()) {
            Some('\n') => {
                // match engine.eval_with_scope::<rhai::Dynamic>(&mut scope, &buf) {
                // Ok(o) => println!("{o}"),

                // Err(e) => println!("Eval error: {e}"),
                // };
                if !buf.is_empty() {
                    command_parser(current_user.clone(), buf.clone());
                }

                buf.clear();
                print!("> ");
            }
            Some('\u{0008}') => {
                buf.pop();
            }

            Some('\u{0009}') => {
                buf.push(' ');
                buf.push(' ');
                buf.push(' ');
                buf.push(' ');
            }

            Some(chr) => buf.push(chr),
            None => (),
        }
    }
}
use crate::rhai_shell::KEYBUFF;

pub fn command_parser(user: String, command: String) {
    let fs = &*FILE_SYSTEM.lock();
    let mut iter = command.split_whitespace();

    let bin_name = iter.next().unwrap();

    if bin_name == "rhai" {
        drop(fs);
        shell();
        return;
    }

    let home_exec_path = format!("/home/{}/bins/{}.wasm", user, bin_name);
    let shared_exec_path = format!("/shared/bins/{}.wasm", bin_name);
    let system_exec_path = format!("/system/bins/{}.wasm", bin_name);

    let home_exec_file = fs.open(&home_exec_path.as_bytes(), OpenOptions::new().read(true));
    let shared_exec_file = fs.open(&shared_exec_path.as_bytes(), OpenOptions::new().read(true));
    let system_exec_file = fs.open(&system_exec_path.as_bytes(), OpenOptions::new().read(true));

    let mut in_home = false;
    let mut in_shared = false;
    let mut in_system = false;

    let mut binary_prog: Vec<u8> = vec![];

    match home_exec_file {
        Ok(file) => {
            let ret = file.read_to_end(&mut binary_prog).unwrap();
            in_home = true;
        }

        Err(error) => {
            trace!("{:?}", error);
            in_home = false;
        }
    }
    match shared_exec_file {
        Ok(file) => {
            let ret = file.read_to_end(&mut binary_prog).unwrap();
            in_shared = true;
        }
        Err(error) => {
            trace!("{:?}", error);
            in_shared = false;
        }
    }
    match system_exec_file {
        Ok(file) => {
            let ret = file.read_to_end(&mut binary_prog).unwrap();
            in_system = true;
        }

        Err(error) => {
            trace!("{:?}", error);
            in_system = false;
        }
    }

    let args = iter.collect::<Vec<&str>>();
    println!("{:?}", args);
    if in_home || in_shared || in_system {
        run_program(binary_prog);
    } else {
        println!("No such binary: {}", bin_name);
        error!("No such binary: {}", bin_name);
    }
}

use crate::filesystem::FILE_SYSTEM;
use genfs::OpenOptions;

pub fn sound(n_frequency: u32) {
    let div: u32;
    let tmp: u8;

    div = 1193180 / n_frequency;
    unsafe {
        outb(0xb6, 0x43);

        set_pit_2(div);

        //And play the sound using the PC speaker
        tmp = inb(0x61);
        if tmp != (tmp | 3) {
            outb(tmp | 3, 0x61);
        }
    }
}

pub fn sound_off() {
    unsafe {
        let tmp = inb(0x61) & 0xFC;
        outb(tmp, 0x61)
    };
    reset_pit_for_cpu();
}

use cpuio::inb;