use std::rc::Rc;

use futures::future::join_all;
use orchid_api_derive::{Coding, Hierarchy};
use orchid_base::{Receipt, ReqHandle, ReqHandleExt, Sym, es, sym};
use orchid_extension::gen_expr::new_atom;
use orchid_extension::ParserObj;
use orchid_extension::tree::{GenMember, merge_trivial};
use orchid_extension::{
	AtomOps, AtomicFeatures, Expr, LexerObj, ReqForSystem, System, SystemCard, SystemCtor, ToExpr,
};

use super::number::num_lib::gen_num_lib;
use super::string::str_atom::{IntStrAtom, StrAtom};
use super::string::str_lib::gen_str_lib;
use crate::std::binary::binary_atom::BlobAtom;
use crate::std::binary::binary_lib::gen_binary_lib;
use crate::std::boolean::gen_bool_lib;
use crate::std::number::num_atom::{CreateFloat, CreateInt};
use crate::std::number::num_lexer::NumLexer;
use crate::std::ops::gen_ops_lib;
use crate::std::ops::subscript_lexer::SubscriptLexer;
use crate::std::option::{OptAtom, gen_option_lib};
use crate::std::protocol::proto_parser::{AsProtoParser, ProtoParser};
use crate::std::protocol::type_parser::{AsTypeParser, TypeParser};
use crate::std::protocol::types::{CreateTag, Tag, Tagged, gen_protocol_lib};
use crate::std::record::record_atom::{CreateRecord, RecordAtom};
use crate::std::record::record_lib::gen_record_lib;
use crate::std::reflection::sym_atom::{CreateSymAtom, SymAtom, gen_sym_lib};
use crate::std::stream::stream_lib::gen_stream_lib;
use crate::std::string::str_lexer::StringLexer;
use crate::std::time::{CreateDT, gen_time_lib};
use crate::std::tuple::{CreateTuple, Tuple, TupleBuilder, gen_tuple_lib};
use crate::{Float, Int};

#[derive(Clone, Debug, Coding, Hierarchy)]
#[extendable]
#[allow(clippy::enum_variant_names, reason = "For the time being there are only ctor calls")]
pub enum StdReq {
	CreateInt(CreateInt),
	CreateFloat(CreateFloat),
	CreateDT(CreateDT),
	CreateTag(CreateTag),
	CreateTuple(CreateTuple),
	CreateRecord(CreateRecord),
	CreateSymAtom(CreateSymAtom),
}

#[derive(Debug, Default)]
pub struct StdSystem;
impl SystemCtor for StdSystem {
	type Deps = ();
	type Card = Self;
	type Instance = Self;
	const NAME: &'static str = "orchid::std";
	const VERSION: f64 = 0.00_01;
	fn inst(&self, _: ()) -> Self::Instance { Self }
}
impl SystemCard for StdSystem {
	type Ctor = Self;
	type Req = StdReq;
	fn atoms() -> impl IntoIterator<Item = Option<Box<dyn AtomOps>>> {
		[
			Some(BlobAtom::ops()),
			Some(Int::ops()),
			Some(Float::ops()),
			Some(StrAtom::ops()),
			Some(IntStrAtom::ops()),
			Some(OptAtom::ops()),
			Some(RecordAtom::ops()),
			Some(Tuple::ops()),
			Some(TupleBuilder::ops()),
			Some(Tag::ops()),
			Some(Tagged::ops()),
		]
	}
}
impl System for StdSystem {
	type Ctor = Self;
	async fn request<'a>(
		&self,
		xreq: Box<dyn ReqHandle<'a> + 'a>,
		req: ReqForSystem<Self>,
	) -> Receipt<'a> {
		match req {
			StdReq::CreateInt(ref req @ CreateInt(int)) =>
				xreq.reply(req, &new_atom(int).to_expr().await.serialize().await).await.unwrap(),
			StdReq::CreateFloat(ref req @ CreateFloat(float)) =>
				xreq.reply(req, &new_atom(float).to_expr().await.serialize().await).await.unwrap(),
			StdReq::CreateDT(ref req @ CreateDT(dt)) =>
				xreq.reply(req, &new_atom(dt).to_expr().await.serialize().await).await.unwrap(),
			StdReq::CreateTuple(ref req @ CreateTuple(ref items)) => {
				let tpl = Tuple(Rc::new(join_all(items.iter().copied().map(Expr::deserialize)).await));
				let tk = new_atom(tpl).to_expr().await.serialize().await;
				xreq.reply(req, &tk).await.unwrap()
			},
			StdReq::CreateRecord(ref req @ CreateRecord(ref items)) => {
				let values =
					join_all(items.iter().map(async |(k, v)| (es(*k).await, Expr::deserialize(*v).await)))
						.await;
				let rec = RecordAtom(Rc::new(values.into_iter().collect()));
				let tk = new_atom(rec).to_expr().await.serialize().await;
				xreq.reply(req, &tk).await.unwrap()
			},
			StdReq::CreateSymAtom(ref req @ CreateSymAtom(sym_tok)) => {
				let sym_atom = SymAtom(Sym::from_api(sym_tok).await);
				xreq.reply(req, &new_atom(sym_atom).to_expr().await.serialize().await).await.unwrap()
			},
			StdReq::CreateTag(ref req @ CreateTag { name, ref impls }) => {
				let tag_atom = Tag {
					id: Sym::from_api(name).await,
					impls: Rc::new(
						join_all(
							(impls.iter())
								.map(|(k, v)| async { (Sym::from_api(*k).await, Expr::deserialize(*v).await) }),
						)
						.await
						.into_iter()
						.collect(),
					),
				};
				xreq.reply(req, &new_atom(tag_atom).to_expr().await.serialize().await).await.unwrap()
			},
		}
	}
	fn lexers(&self) -> Vec<LexerObj> { vec![&StringLexer, &NumLexer, &SubscriptLexer] }
	fn parsers(&self) -> Vec<ParserObj> {
		vec![&AsTypeParser, &TypeParser, &AsProtoParser, &ProtoParser]
	}
	async fn env(&self) -> Vec<GenMember> {
		merge_trivial([
			gen_bool_lib(),
			gen_num_lib(),
			gen_str_lib(),
			gen_option_lib(),
			gen_record_lib(),
			gen_tuple_lib(),
			gen_protocol_lib(),
			gen_sym_lib().await,
			gen_ops_lib(),
			gen_binary_lib(),
			gen_stream_lib(),
			gen_time_lib(),
		])
	}
	async fn prelude(&self) -> Vec<Sym> {
		vec![sym!(std), sym!(std::tuple), sym!(std::option), sym!(std::record), sym!(std::string)]
	}
}