//! Environment call handling routines

use {
    super::{mem::Memory, Vm},
    crate::{arch, ipc::buffer::IpcBuffer, kmain::IPC_BUFFERS},
    log::{debug, error, info, trace, warn},
};

pub fn handler(vm: &mut Vm) {
    let r255 = vm.registers[255].cast::<u64>();
    let r254 = vm.registers[254].cast::<u64>();
    let r253 = vm.registers[253].cast::<u64>();

    debug!("Ecall number {:?}", r255);
    trace!("Register dump: {:?}", vm.registers);

    match r255 {
        0 => {
            // TODO: explode computer
            // hello world ecall
            for x in 0u64..=255 {
                vm.registers[x as usize] = x.into();
            }
        }
        1 => {
            // Make buffer
            let r255 = vm.registers[255].cast::<u64>();
            let r254 = vm.registers[254].cast::<u64>();
            let r253 = vm.registers[253].cast::<u64>();

            let bounded = match r254 {
                0 => false,
                1 => true,
                _ => {
                    panic!("Bad");
                }
            };

            let length = r254;

            let mut buffs = IPC_BUFFERS.lock();
            let abc;

            match bounded {
                false => {
                    abc = IpcBuffer::new(false, 0);
                }
                true => {
                    abc = IpcBuffer::new(true, length);
                }
            };
            let buff_id = arch::hardware_random_u64();
            buffs.insert(buff_id, abc);
            debug!("Buffer ID: {}", buff_id);
        }
        2 => {
            // Delete buffer
        }
        3 => {
            // Send a message to a buffer
            let r254 = vm.registers[254].cast::<u64>();
            let r253 = vm.registers[253].cast::<u64>();
            let r252 = vm.registers[252].cast::<u64>();

            let buffer_id = r254;
            let mem_addr = r253;
            let length = r252 as usize;
            trace!("IPC address: {:?}", mem_addr);
            use alloc::vec::Vec;

            match buffer_id {
                1 => {
                    error!("Logging via IPC isn't quite ready")
                }
                buffer_id => {
                    info!("Message has been sent to {}", buffer_id)
                }
            }
        }
        // 4
        // 5
        _ => {
            log::error!("Syscall unknown {:?}", r255)
        }
    }
}