use crate::ffi::ffi_handle::FFIHandle;
use crate::ffi::{
    ffi_handle_arc_dyn_getter, ffi_handle_arc_stringkey_getter, FFIResult, FromFFIHandle, NonOwnedPtrString,
};
use crate::static_data::{Form, Gender, Species, SpeciesImpl};
use crate::{PkmnError, Random, StringKey};
use hashbrown::HashSet;
use std::ffi::{c_char, CStr};
use std::sync::Arc;

/// Creates a new species.
#[no_mangle]
unsafe extern "C" fn species_new(
    id: u16,
    name: NonOwnedPtrString,
    gender_rate: f32,
    growth_rate: NonOwnedPtrString,
    capture_rate: u8,
    default_form: FFIHandle<Arc<dyn Form>>,
    flags: *const *const c_char,
    flags_length: usize,
) -> FFIResult<FFIHandle<Arc<dyn Species>>> {
    let name: StringKey = match CStr::from_ptr(name).to_str() {
        Ok(name) => name.into(),
        Err(_) => return FFIResult::err(PkmnError::InvalidCString.into()),
    };
    let growth_rate: StringKey = match CStr::from_ptr(growth_rate).to_str() {
        Ok(growth_rate) => growth_rate.into(),
        Err(_) => return FFIResult::err(PkmnError::InvalidCString.into()),
    };

    let flags = std::slice::from_raw_parts(flags, flags_length);
    let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
    for flag in flags {
        let flag = match CStr::from_ptr(*flag).to_str() {
            Ok(flag) => flag,
            Err(_) => return FFIResult::err(PkmnError::InvalidCString.into()),
        };
        flags_set.insert(flag.into());
    }
    let default_form = if default_form.is_none() {
        return FFIResult::err(PkmnError::NullReference.into());
    } else {
        default_form.from_ffi_handle()
    };

    let a: Arc<dyn Species> = Arc::new(SpeciesImpl::new(
        id,
        &name,
        gender_rate,
        &growth_rate,
        capture_rate,
        default_form.clone(),
        flags_set,
    ));
    FFIResult::ok(FFIHandle::get_handle(a.into()))
}

ffi_handle_arc_dyn_getter!(Species, id, u16);
ffi_handle_arc_stringkey_getter!(Species, name);
ffi_handle_arc_dyn_getter!(Species, gender_rate, f32);
ffi_handle_arc_stringkey_getter!(Species, growth_rate);
ffi_handle_arc_dyn_getter!(Species, capture_rate, u8);

/// Adds a new form to the species.
#[no_mangle]
unsafe extern "C" fn species_add_form(
    species: FFIHandle<Arc<dyn Species>>,
    name: NonOwnedPtrString,
    form: FFIHandle<Arc<dyn Form>>,
) -> FFIResult<()> {
    let form = if form.is_none() {
        return FFIResult::err(PkmnError::NullReference.into());
    } else {
        form.from_ffi_handle()
    };
    species.from_ffi_handle().add_form(CStr::from_ptr(name).into(), form);
    FFIResult::ok(())
}

/// Gets a form by name.
#[no_mangle]
unsafe extern "C" fn species_get_form(
    species: FFIHandle<Arc<dyn Species>>,
    name: NonOwnedPtrString,
) -> FFIHandle<Arc<dyn Form>> {
    let form = species.from_ffi_handle().get_form(&CStr::from_ptr(name).into());
    if let Some(form) = form {
        FFIHandle::get_handle(form.into())
    } else {
        FFIHandle::none()
    }
}

/// Gets a form by name.
#[no_mangle]
unsafe extern "C" fn species_get_random_gender(species: FFIHandle<Arc<dyn Species>>, seed: u64) -> Gender {
    let mut rand = Random::new(seed as u128);
    species.from_ffi_handle().get_random_gender(&mut rand)
}