use crate::ffi::{BorrowedPtr, ExternPointer, OwnedPtr};
use crate::static_data::{Ability, EffectParameter};
use crate::StringKey;
use std::ffi::{c_char, CStr, CString};
use std::ptr::drop_in_place;

#[no_mangle]
unsafe extern "C" fn ability_new(
    name: *const c_char,
    effect: *const c_char,
    parameters: *const OwnedPtr<EffectParameter>,
    parameters_length: usize,
) -> OwnedPtr<Ability> {
    let parameters = std::slice::from_raw_parts(parameters, parameters_length);
    let mut parameters_vec: Vec<EffectParameter> = Vec::with_capacity(parameters_length);
    for parameter in parameters {
        parameters_vec.push(*Box::from_raw(*parameter));
    }

    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
    let effect: StringKey = CStr::from_ptr(effect).to_str().unwrap().into();

    Box::into_raw(Box::new(Ability::new(&name, &effect, parameters_vec)))
}

#[no_mangle]
unsafe extern "C" fn ability_drop(ptr: OwnedPtr<Ability>) {
    drop_in_place(ptr)
}

#[no_mangle]
unsafe extern "C" fn ability_name(ptr: ExternPointer<Ability>) -> OwnedPtr<c_char> {
    CString::new(ptr.as_ref().name().str()).unwrap().into_raw()
}

#[no_mangle]
unsafe extern "C" fn ability_effect(ptr: ExternPointer<Ability>) -> OwnedPtr<c_char> {
    CString::new(ptr.as_ref().effect().str()).unwrap().into_raw()
}

#[no_mangle]
unsafe extern "C" fn ability_parameter_length(ptr: ExternPointer<Ability>) -> usize {
    ptr.as_ref().parameters().len()
}

#[no_mangle]
unsafe extern "C" fn ability_parameter_get(ptr: ExternPointer<Ability>, index: usize) -> BorrowedPtr<EffectParameter> {
    if let Some(p) = ptr.as_ref().parameters().get(index) {
        p as *const EffectParameter
    } else {
        std::ptr::null()
    }
}