use crate::ffi::ffi_handle::{FFIHandle, FFIObject, FromFFIHandle};
use crate::ffi::{FFIResult, OwnedPtrString};
use crate::static_data::EffectParameter;
use crate::{PkmnError, StringKey};
use anyhow::anyhow;
use std::ffi::{c_char, CStr, CString};
use std::ops::Deref;
use std::sync::Arc;

/// The Foreign Function Interface for abilities
mod ability;
/// The Foreign Function Interface for forms
mod form;
/// The Foreign Function Interface for growth rates
mod growth_rate;
/// The Foreign Function Interface for items
mod item;
/// The Foreign Function Interface for learnable moves
mod learnable_moves;
/// The Foreign Function Interface for libraries
mod libraries;
/// The Foreign Function Interface for moves
mod move_data;
/// The Foreign Function Interface for natures
mod nature;
/// The Foreign Function Interface for species
mod species;
/// The Foreign Function Interface for sets of statistics
mod statistic_set;

/// Instantiates an effect parameter with a boolean.
#[no_mangle]
extern "C" fn effect_parameter_new_bool(value: u8) -> FFIHandle<Arc<EffectParameter>> {
    FFIHandle::get_handle(FFIObject::EffectParameter(Arc::new(EffectParameter::from(value == 1))))
}

/// Instantiates an effect parameter with an integer.
#[no_mangle]
extern "C" fn effect_parameter_new_int(value: i64) -> FFIHandle<Arc<EffectParameter>> {
    FFIHandle::get_handle(FFIObject::EffectParameter(Arc::new(EffectParameter::from(value))))
}

/// Instantiates an effect parameter with a float.
#[no_mangle]
extern "C" fn effect_parameter_new_float(value: f32) -> FFIHandle<Arc<EffectParameter>> {
    FFIHandle::get_handle(FFIObject::EffectParameter(Arc::new(EffectParameter::from(value))))
}

/// Instantiates an effect parameter with a string.
#[no_mangle]
unsafe extern "C" fn effect_parameter_new_string(value: *const c_char) -> FFIResult<FFIHandle<Arc<EffectParameter>>> {
    let sk: StringKey = match CStr::from_ptr(value).to_str() {
        Ok(sk) => sk.into(),
        Err(_) => return FFIResult::err(PkmnError::InvalidCString.into()),
    };
    FFIResult::ok(FFIHandle::get_handle(FFIObject::EffectParameter(Arc::new(
        EffectParameter::from(sk),
    ))))
}

/// Get the type of an effect parameter.
#[no_mangle]
extern "C" fn effect_parameter_get_type(ptr: FFIHandle<Arc<EffectParameter>>) -> u8 {
    match ptr.from_ffi_handle().deref() {
        EffectParameter::Bool(_) => 0,
        EffectParameter::Int(_) => 1,
        EffectParameter::Float(_) => 2,
        EffectParameter::String(_) => 3,
    }
}

/// Get the boolean contained in the effect parameter, panics if the effect parameter is not a bool.
#[no_mangle]
extern "C" fn effect_parameter_get_as_bool(ptr: FFIHandle<Arc<EffectParameter>>) -> FFIResult<u8> {
    let p = ptr.from_ffi_handle();
    if let EffectParameter::Bool(b) = p.deref() {
        FFIResult::ok(u8::from(*b))
    } else {
        FFIResult::err(anyhow!("Unexpected effect parameter. Expected bool, was: {}", p))
    }
}

/// Get the int contained in the effect parameter, panics if the effect parameter is not a int.
#[no_mangle]
extern "C" fn effect_parameter_get_as_int(ptr: FFIHandle<Arc<EffectParameter>>) -> FFIResult<i64> {
    let p = ptr.from_ffi_handle();
    if let EffectParameter::Int(b) = p.deref() {
        FFIResult::ok(*b)
    } else {
        FFIResult::err(anyhow!("Unexpected effect parameter. Expected int, was: {}", p))
    }
}

/// Get the float contained in the effect parameter, panics if the effect parameter is not a float.
#[no_mangle]
extern "C" fn effect_parameter_get_as_float(ptr: FFIHandle<Arc<EffectParameter>>) -> FFIResult<f32> {
    let p = ptr.from_ffi_handle();
    if let EffectParameter::Float(b) = p.deref() {
        FFIResult::ok(*b)
    } else {
        FFIResult::err(anyhow!("Unexpected effect parameter. Expected float, was: {}", p))
    }
}

/// Get the string contained in the effect parameter, panics if the effect parameter is not a string.
#[no_mangle]
extern "C" fn effect_parameter_get_as_string(ptr: FFIHandle<Arc<EffectParameter>>) -> FFIResult<OwnedPtrString> {
    let p = ptr.from_ffi_handle();
    if let EffectParameter::String(b) = p.deref() {
        match CString::new(b.str().to_string()) {
            Ok(cstr) => FFIResult::ok(OwnedPtrString(cstr.into_raw())),
            Err(_) => FFIResult::err(PkmnError::InvalidCString.into()),
        }
    } else {
        FFIResult::err(anyhow!("Unexpected effect parameter. Expected string, was: {}", p))
    }
}