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// Copyright 2019 Fredrik Portström <https://portstrom.com>
// This is free software distributed under the terms specified in
// the file LICENSE at the top-level directory of this distribution.

/// Site specific configuration of a wiki.
///
/// This is generated using the program [`fetch_mediawiki_configuration`](https://github.com/portstrom/fetch_mediawiki_configuration).
pub struct ConfigurationSource<'a> {
	/// Aliases of the category namespace.
	pub category_namespaces: &'a [&'a str],

	/// Tag names of extension tags.
	pub extension_tags: &'a [&'a str],

	/// Aliases of the file namespace.
	pub file_namespaces: &'a [&'a str],

	/// Characters that can appear in link trails.
	pub link_trail: &'a str,

	/// Magic words that can appear between `__` and `__`.
	pub magic_words: &'a [&'a str],

	/// Protocols that can be used for external links.
	pub protocols: &'a [&'a str],

	/// Magic words that can be used for redirects.
	pub redirect_magic_words: &'a [&'a str],
}

#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum Namespace {
	Category,
	File,
}

impl crate::Configuration {
	/// Allocates and returns a new configuration based on the given site specific configuration.
	#[must_use]
	pub fn new(source: &ConfigurationSource) -> Self {
		let mut configuration = crate::Configuration {
			character_entities: crate::Trie::new(),
			link_trail_character_set: crate::HashSet::new(),
			magic_words: crate::Trie::new(),
			namespaces: crate::Trie::new(),
			protocols: crate::Trie::new(),
			redirect_magic_words: crate::Trie::new(),
			tag_name_map: crate::HashMap::new(),
		};
		for (name, character) in crate::html_entities::HTML_ENTITIES {
			configuration
				.character_entities
				.add_case_sensitive_term(&format!("{};", name), *character);
		}
		for character in source.link_trail.chars() {
			configuration.link_trail_character_set.insert(character);
		}
		for protocol in source.protocols {
			configuration.protocols.add_term(protocol, ());
		}
		for magic_word in source.magic_words {
			configuration.magic_words.add_term(magic_word, ());
		}
		for namespace in source.category_namespaces {
			configuration
				.namespaces
				.add_term(&format!("{}:", namespace), Namespace::Category);
		}
		for namespace in source.file_namespaces {
			configuration
				.namespaces
				.add_term(&format!("{}:", namespace), Namespace::File);
		}
		for redirect_magic_word in source.redirect_magic_words {
			configuration
				.redirect_magic_words
				.add_term(redirect_magic_word, ());
		}
		for tag_name in source.extension_tags {
			configuration
				.tag_name_map
				.insert(tag_name.to_string(), crate::TagClass::ExtensionTag);
		}
		for tag_name in [
			"abbr",
			"b",
			"bdi",
			"bdo",
			"blockquote",
			"br",
			"caption",
			"center",
			"cite",
			"code",
			"data",
			"dd",
			"del",
			"dfn",
			"div",
			"dl",
			"dt",
			"em",
			"font",
			"h1",
			"h2",
			"h3",
			"h4",
			"h5",
			"h6",
			"hr",
			"i",
			"ins",
			"kbd",
			"li",
			"mark",
			"ol",
			"p",
			"pre",
			"q",
			"rb",
			"rp",
			"rt",
			"ruby",
			"s",
			"samp",
			"small",
			"span",
			"strike",
			"strong",
			"sub",
			"sup",
			"table",
			"td",
			"th",
			"time",
			"tr",
			"tt",
			"u",
			"ul",
			"var",
			"wbr",
		]
		.iter()
		{
			configuration
				.tag_name_map
				.insert(tag_name.to_string(), crate::TagClass::Tag);
		}
		configuration
	}

	/// Parses wiki text into structured data.
	#[must_use]
	pub fn parse<'a>(&self, wiki_text: &'a str) -> crate::Output<'a> {
		crate::parse::parse(self, wiki_text)
	}
}

impl Default for crate::Configuration {
	/// Allocates and returns a configuration suitable for testing and quick and dirty prototyping. For correctly parsing an actual wiki, please get the correct site configuration for that particular wiki.
	fn default() -> Self {
		crate::default::create_configuration()
	}
}