use crate::defines::LevelInt;
use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
use crate::static_data::{GrowthRate, GrowthRateLibrary, GrowthRateLibraryImpl};
use std::ffi::{c_char, CStr};
use std::ptr::drop_in_place;

/// Instantiates a new growth rate library with a capacity
#[no_mangle]
extern "C" fn growth_rate_library_new(capacity: usize) -> IdentifiablePointer<Box<dyn GrowthRateLibrary>> {
    let b: Box<dyn GrowthRateLibrary> = Box::new(GrowthRateLibraryImpl::new(capacity));
    b.into()
}

/// Drops the growthrate library.
#[no_mangle]
unsafe extern "C" fn growth_rate_library_drop(ptr: OwnedPtr<Box<dyn GrowthRateLibrary>>) {
    drop_in_place(ptr)
}

/// Calculates the level for a given growth key name and a certain experience.
#[no_mangle]
unsafe extern "C" fn growth_rate_library_calculate_level(
    ptr: ExternPointer<Box<dyn GrowthRateLibrary>>,
    growth_rate: BorrowedPtr<c_char>,
    experience: u32,
) -> LevelInt {
    ptr.as_ref()
        .calculate_level(&CStr::from_ptr(growth_rate).into(), experience)
}

/// Calculates the experience for a given growth key name and a certain level.
#[no_mangle]
unsafe extern "C" fn growth_rate_library_calculate_experience(
    ptr: ExternPointer<Box<dyn GrowthRateLibrary>>,
    growth_rate: BorrowedPtr<c_char>,
    level: LevelInt,
) -> NativeResult<u32> {
    ptr.as_ref()
        .calculate_experience(&CStr::from_ptr(growth_rate).into(), level)
        .into()
}

/// Adds a new growth rate with a name and value.
#[no_mangle]
unsafe extern "C" fn growth_rate_library_add_growth_rate(
    mut ptr: ExternPointer<Box<dyn GrowthRateLibrary>>,
    name: BorrowedPtr<c_char>,
    growth_rate: OwnedPtr<Box<dyn GrowthRate>>,
) {
    ptr.as_mut()
        .add_growth_rate(&CStr::from_ptr(name).into(), *Box::from_raw(growth_rate));
}