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use crate::parser::{ParseData, ParseDataField, TypeOrInline};
use proc_macro2::TokenStream;
use quote::{quote, quote_spanned};
use syn::{spanned::Spanned, LitStr};

pub(super) fn gen_doc_option(doc: &[String]) -> TokenStream {
	let doc = doc.join("\n");
	let doc = doc.trim();
	if doc.is_empty() {
		quote!(::core::option::Option::None)
	} else {
		quote!(::core::option::Option::Some(#doc))
	}
}

impl ParseData {
	pub(super) fn gen_schema(&self) -> TokenStream {
		match self {
			Self::Struct { name, fields } => gen_struct(name.as_ref(), fields),
			Self::Enum(variants) => gen_enum(variants),
			Self::Alternatives(alt) => gen_alt(alt),
			Self::Unit => gen_unit()
		}
	}
}

fn gen_struct(name: Option<&LitStr>, fields: &[ParseDataField]) -> TokenStream {
	let openapi = path!(::openapi_type::openapi);
	let option = path!(::core::option::Option);

	let name = match name {
		Some(name) => quote!(#option::Some(::std::string::String::from(#name))),
		None => quote!(#option::None)
	};

	let fields = fields.iter().map(|f| {
		let name = &f.name;
		let doc = gen_doc_option(&f.doc);
		let schema = match &f.ty {
			TypeOrInline::Type(ty) => {
				quote_spanned!(ty.span() => <#ty as ::openapi_type::OpenapiType>::schema())
			},
			TypeOrInline::Inline(data) => data.gen_schema()
		};

		if f.flatten {
			quote!({
				let field_schema = #schema;
				::openapi_type::private::flatten(
					&mut dependencies,
					&mut properties,
					&mut required,
					field_schema
				);
			})
		} else {
			quote!({
				const FIELD_NAME: &::core::primitive::str = #name;
				const FIELD_DOC: #option<&'static ::core::primitive::str> = #doc;

				let mut field_schema = #schema;

				// fields in OpenAPI are nullable by default
				match field_schema.nullable {
					true => field_schema.nullable = false,
					false => required.push(::std::string::String::from(FIELD_NAME))
				};

				let field_schema = ::openapi_type::private::inline_if_unnamed(
					&mut dependencies, field_schema, FIELD_DOC
				);
				let field_schema = match field_schema {
					#openapi::ReferenceOr::Item(schema) => {
						#openapi::ReferenceOr::Item(::std::boxed::Box::new(schema))
					},
					#openapi::ReferenceOr::Reference { reference } => {
						#openapi::ReferenceOr::Reference { reference }
					}
				};

				properties.insert(
					::std::string::String::from(FIELD_NAME),
					field_schema
				);
			})
		}
	});

	quote! {
		{
			let mut properties = ::openapi_type::private::Properties::new();
			let mut required = ::openapi_type::private::Required::new();

			#(#fields)*

			let mut schema = ::openapi_type::OpenapiSchema::new(
				#openapi::SchemaKind::Type(
					#openapi::Type::Object(
						#openapi::ObjectType {
							properties,
							required,
							.. ::std::default::Default::default()
						}
					)
				)
			);
			schema.name = #name;
			schema
		}
	}
}

fn gen_enum(variants: &[LitStr]) -> TokenStream {
	let openapi = path!(::openapi_type::openapi);
	quote! {
		{
			let mut enumeration = <::std::vec::Vec<::std::string::String>>::new();
			#(enumeration.push(::std::string::String::from(#variants));)*
			::openapi_type::OpenapiSchema::new(
				#openapi::SchemaKind::Type(
					#openapi::Type::String(
						#openapi::StringType {
							enumeration,
							.. ::std::default::Default::default()
						}
					)
				)
			)
		}
	}
}

fn gen_alt(alt: &[ParseData]) -> TokenStream {
	let openapi = path!(::openapi_type::openapi);
	let schema = alt.iter().map(|data| data.gen_schema());
	quote! {
		{
			let mut alternatives = <::std::vec::Vec<
				#openapi::ReferenceOr<#openapi::Schema>
			>>::new();
			#(alternatives.push({
				let alt_schema = #schema;
				::openapi_type::private::inline_if_unnamed(&mut dependencies, alt_schema, None)
			});)*

			::openapi_type::OpenapiSchema::new(
				#openapi::SchemaKind::OneOf {
					one_of: alternatives
				}
			)
		}
	}
}

fn gen_unit() -> TokenStream {
	let openapi = path!(::openapi_type::openapi);
	quote! {
		::openapi_type::OpenapiSchema::new(
			#openapi::SchemaKind::Type(
				#openapi::Type::Object(
					#openapi::ObjectType {
						additional_properties: ::std::option::Option::Some(
							#openapi::AdditionalProperties::Any(false)
						),
						.. ::std::default::Default::default()
					}
				)
			)
		)
	}
}