use crate::dynamic_data::{Pokemon, PokemonParty};
use crate::ffi::ffi_handle::{FFIHandle, FromFFIHandle};
use crate::ffi::FFIResult;
use std::sync::Arc;

/// Instantiates a party with a set size.
#[no_mangle]
extern "C" fn pokemon_party_new(capacity: usize) -> FFIHandle<Arc<PokemonParty>> {
    FFIHandle::get_handle(Arc::new(PokemonParty::new(capacity)).into())
}

/// Gets a Pokemon at an index in the party.
#[no_mangle]
extern "C" fn pokemon_party_at(ptr: FFIHandle<Arc<PokemonParty>>, index: usize) -> FFIHandle<Pokemon> {
    if let Some(v) = ptr.from_ffi_handle().at(index) {
        FFIHandle::get_handle(v.into())
    } else {
        FFIHandle::none()
    }
}

/// Gets a Pokemon at an index in the party.
#[no_mangle]
extern "C" fn pokemon_party_switch(ptr: FFIHandle<Arc<PokemonParty>>, a: usize, b: usize) {
    ptr.from_ffi_handle().switch(a, b);
}

/// Sets the Pokemon at an index to a Pokemon, returning the old Pokemon.
#[no_mangle]
extern "C" fn pokemon_party_swap_into(
    ptr: FFIHandle<Arc<PokemonParty>>,
    index: usize,
    pokemon: FFIHandle<Pokemon>,
) -> FFIResult<FFIHandle<Pokemon>> {
    let pokemon = if pokemon.is_none() {
        None
    } else {
        Some(pokemon.from_ffi_handle())
    };
    match ptr.from_ffi_handle().swap_into(index, pokemon) {
        Ok(Some(v)) => FFIResult::ok(FFIHandle::get_handle(v.into())),
        Ok(None) => FFIResult::ok(FFIHandle::none()),
        Err(e) => FFIResult::err(e),
    }
}

/// Whether or not the party still has Pokemon that can be used in battle.
#[no_mangle]
extern "C" fn pokemon_party_has_usable_pokemon(ptr: FFIHandle<Arc<PokemonParty>>) -> u8 {
    u8::from(ptr.from_ffi_handle().has_usable_pokemon())
}

/// Get the length of the underlying list of Pokemon.
#[no_mangle]
extern "C" fn pokemon_party_length(ptr: FFIHandle<Arc<PokemonParty>>) -> usize {
    ptr.from_ffi_handle().length()
}

/// Makes sure there are no empty spots in the party anymore, leaving the length the same.
#[no_mangle]
extern "C" fn pokemon_party_pack_party(ptr: FFIHandle<Arc<PokemonParty>>) -> FFIResult<()> {
    ptr.from_ffi_handle().pack_party().into()
}

/// Checks if the party contains a given pokemon.
#[no_mangle]
extern "C" fn pokemon_party_has_pokemon(ptr: FFIHandle<Arc<PokemonParty>>, pokemon: FFIHandle<Pokemon>) -> u8 {
    u8::from(ptr.from_ffi_handle().has_pokemon(&pokemon.from_ffi_handle()))
}