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use std::{
	borrow::Cow,
	collections::HashSet,
	fmt,
};

use clang::{Entity, EntityKind, EntityVisitResult};
use maplit::hashmap;
use once_cell::sync::Lazy;

use crate::{
	CompiledInterpolation,
	Const,
	DefaultElement,
	Element,
	EntityElement,
	GeneratedElement,
	get_debug,
	StrExt,
};

#[derive(Clone)]
pub struct Enum<'tu> {
	entity: Entity<'tu>,
}

impl<'tu> Enum<'tu> {
	pub fn new(entity: Entity<'tu>) -> Self {
		Self { entity }
	}

	pub fn consts(&self) -> Vec<Const> {
		let mut out = vec![];
		self.entity.visit_children(|const_decl, _| {
			if const_decl.get_kind() == EntityKind::EnumConstantDecl {
				out.push(Const::new(const_decl));
			}
			EntityVisitResult::Continue
		});
		out
	}
}

impl<'tu> EntityElement<'tu> for Enum<'tu> {
	fn entity(&self) -> Entity<'tu> {
		self.entity
	}
}

impl Element for Enum<'_> {
	fn is_system(&self) -> bool {
		DefaultElement::is_system(self)
	}

	fn is_public(&self) -> bool {
		DefaultElement::is_public(self)
	}

	fn usr(&self) -> Cow<str> {
		DefaultElement::usr(self)
	}

	fn rendered_doc_comment_with_prefix(&self, prefix: &str, opencv_version: &str) -> String {
		DefaultElement::rendered_doc_comment_with_prefix(self, prefix, opencv_version)
	}

	fn cpp_namespace(&self) -> Cow<str> {
		DefaultElement::cpp_namespace(self)
	}

	fn cpp_localname(&self) -> Cow<str> {
		DefaultElement::cpp_localname(self)
	}

	fn rust_module(&self) -> Cow<str> {
		DefaultElement::rust_module(self)
	}

	fn rust_leafname(&self) -> Cow<str> {
		self.cpp_localname()
	}

	fn rust_localname(&self) -> Cow<str> {
		DefaultElement::rust_localname(self)
	}
}

impl GeneratedElement for Enum<'_> {
	fn element_safe_id(&self) -> String {
		format!("{}-{}", self.rust_module(), self.rust_localname())
	}

	fn gen_rust(&self, opencv_version: &str) -> String {
		static ENUM_TPL: Lazy<CompiledInterpolation> = Lazy::new(
			|| include_str!("../tpl/enum/enum.tpl.ru.rs").compile_interpolation()
		);

		static CONST_TPL: Lazy<CompiledInterpolation> = Lazy::new(
			|| include_str!("../tpl/enum/const.tpl.ru.rs").compile_interpolation()
		);

		static CONST_IGNORED_TPL: Lazy<CompiledInterpolation> = Lazy::new(
			|| include_str!("../tpl/enum/const_ignored.tpl.ru.rs").compile_interpolation()
		);

		let consts = self.consts();
		let mut generated_values = HashSet::with_capacity(consts.len());
		let consts = consts.into_iter()
			.map(|c| {
				let name = c.rust_leafname();
				let value = c.value().expect("Can't get value of enum variant").to_string();
				let is_ignored = generated_values.contains(&value);
				let tpl = if is_ignored {
					&CONST_IGNORED_TPL
				} else {
					&CONST_TPL
				};
				let doc_comment = if is_ignored {
					c.rendered_doc_comment_with_prefix("//", opencv_version)
				} else {
					c.rendered_doc_comment(opencv_version)
				};
				generated_values.insert(value.clone());
				tpl.interpolate(&hashmap! {
					"doc_comment" => doc_comment,
					"name" => name.into_owned(),
					"value" => value,
				})
			}).collect::<Vec<_>>();
		ENUM_TPL.interpolate(&hashmap! {
			"doc_comment" => self.rendered_doc_comment(opencv_version),
			"debug" => get_debug(self),
			"rust_local" => self.rust_localname().into_owned(),
			"consts" => consts.join(""),
		})
	}
}

impl fmt::Display for Enum<'_> {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		write!(f, "{}", self.entity.get_display_name().unwrap_or_else(|| "unnamed".to_string()))
	}
}

impl fmt::Debug for Enum<'_> {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		let mut debug_struct = f.debug_struct("Enum");
		self.update_debug_struct(&mut debug_struct)
			.field("consts", &self.consts())
			.finish()
	}
}