/*************************************************************************/
/*  gdscript_text_document.cpp                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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/* "Software"), to deal in the Software without restriction, including   */
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#include "gdscript_text_document.h"
#include "../gdscript.h"
#include "core/os/os.h"
#include "editor/editor_settings.h"
#include "gdscript_extend_parser.h"
#include "gdscript_language_protocol.h"

void GDScriptTextDocument::_bind_methods() {
	ClassDB::bind_method(D_METHOD("didOpen"), &GDScriptTextDocument::didOpen);
	ClassDB::bind_method(D_METHOD("didChange"), &GDScriptTextDocument::didChange);
	ClassDB::bind_method(D_METHOD("documentSymbol"), &GDScriptTextDocument::documentSymbol);
	ClassDB::bind_method(D_METHOD("completion"), &GDScriptTextDocument::completion);
	ClassDB::bind_method(D_METHOD("resolve"), &GDScriptTextDocument::resolve);
	ClassDB::bind_method(D_METHOD("foldingRange"), &GDScriptTextDocument::foldingRange);
	ClassDB::bind_method(D_METHOD("codeLens"), &GDScriptTextDocument::codeLens);
	ClassDB::bind_method(D_METHOD("documentLink"), &GDScriptTextDocument::documentLink);
	ClassDB::bind_method(D_METHOD("colorPresentation"), &GDScriptTextDocument::colorPresentation);
	ClassDB::bind_method(D_METHOD("hover"), &GDScriptTextDocument::hover);
	ClassDB::bind_method(D_METHOD("definition"), &GDScriptTextDocument::definition);
}

void GDScriptTextDocument::didOpen(const Variant &p_param) {
	lsp::TextDocumentItem doc = load_document_item(p_param);
	sync_script_content(doc.uri, doc.text);
}

void GDScriptTextDocument::didChange(const Variant &p_param) {
	lsp::TextDocumentItem doc = load_document_item(p_param);
	Dictionary dict = p_param;
	Array contentChanges = dict["contentChanges"];
	for (int i = 0; i < contentChanges.size(); ++i) {
		lsp::TextDocumentContentChangeEvent evt;
		evt.load(contentChanges[i]);
		doc.text = evt.text;
	}
	sync_script_content(doc.uri, doc.text);
}

lsp::TextDocumentItem GDScriptTextDocument::load_document_item(const Variant &p_param) {
	lsp::TextDocumentItem doc;
	Dictionary params = p_param;
	doc.load(params["textDocument"]);
	return doc;
}

void GDScriptTextDocument::initialize() {

	if (GDScriptLanguageProtocol::get_singleton()->is_smart_resolve_enabled()) {

		const HashMap<StringName, ClassMembers> &native_members = GDScriptLanguageProtocol::get_singleton()->get_workspace().native_members;

		const StringName *class_ptr = native_members.next(NULL);
		while (class_ptr) {

			const ClassMembers &members = native_members.get(*class_ptr);

			const String *name = members.next(NULL);
			while (name) {

				const lsp::DocumentSymbol *symbol = members.get(*name);
				lsp::CompletionItem item = symbol->make_completion_item(false);
				item.data = JOIN_SYMBOLS(String(*class_ptr), *name);
				native_member_completions.push_back(item.to_json());

				name = members.next(name);
			}

			class_ptr = native_members.next(class_ptr);
		}
	}
}

Array GDScriptTextDocument::documentSymbol(const Dictionary &p_params) {
	Dictionary params = p_params["textDocument"];
	String uri = params["uri"];
	String path = GDScriptLanguageProtocol::get_singleton()->get_workspace().get_file_path(uri);
	Array arr;
	if (const Map<String, ExtendGDScriptParser *>::Element *parser = GDScriptLanguageProtocol::get_singleton()->get_workspace().scripts.find(path)) {
		Vector<lsp::DocumentedSymbolInformation> list;
		parser->get()->get_symbols().symbol_tree_as_list(uri, list);
		for (int i = 0; i < list.size(); i++) {
			arr.push_back(list[i].to_json());
		}
	}
	return arr;
}

Array GDScriptTextDocument::completion(const Dictionary &p_params) {

	Array arr;

	lsp::CompletionParams params;
	params.load(p_params);
	Dictionary request_data = params.to_json();

	List<ScriptCodeCompletionOption> options;
	GDScriptLanguageProtocol::get_singleton()->get_workspace().completion(params, &options);

	if (!options.empty()) {

		int i = 0;
		arr.resize(options.size());

		for (const List<ScriptCodeCompletionOption>::Element *E = options.front(); E; E = E->next()) {

			const ScriptCodeCompletionOption &option = E->get();
			lsp::CompletionItem item;
			item.label = option.display;
			item.data = request_data;

			switch (option.kind) {
				case ScriptCodeCompletionOption::KIND_ENUM:
					item.kind = lsp::CompletionItemKind::Enum;
					break;
				case ScriptCodeCompletionOption::KIND_CLASS:
					item.kind = lsp::CompletionItemKind::Class;
					break;
				case ScriptCodeCompletionOption::KIND_MEMBER:
					item.kind = lsp::CompletionItemKind::Property;
					break;
				case ScriptCodeCompletionOption::KIND_FUNCTION:
					item.kind = lsp::CompletionItemKind::Method;
					break;
				case ScriptCodeCompletionOption::KIND_SIGNAL:
					item.kind = lsp::CompletionItemKind::Event;
					break;
				case ScriptCodeCompletionOption::KIND_CONSTANT:
					item.kind = lsp::CompletionItemKind::Constant;
					break;
				case ScriptCodeCompletionOption::KIND_VARIABLE:
					item.kind = lsp::CompletionItemKind::Variable;
					break;
				case ScriptCodeCompletionOption::KIND_FILE_PATH:
					item.kind = lsp::CompletionItemKind::File;
					break;
				case ScriptCodeCompletionOption::KIND_NODE_PATH:
					item.kind = lsp::CompletionItemKind::Snippet;
					break;
				case ScriptCodeCompletionOption::KIND_PLAIN_TEXT:
					item.kind = lsp::CompletionItemKind::Text;
					break;
			}

			arr[i] = item.to_json(true);
			i++;
		}
	} else if (GDScriptLanguageProtocol::get_singleton()->is_smart_resolve_enabled()) {

		arr = native_member_completions.duplicate();

		for (Map<String, ExtendGDScriptParser *>::Element *E = GDScriptLanguageProtocol::get_singleton()->get_workspace().scripts.front(); E; E = E->next()) {

			ExtendGDScriptParser *script = E->get();
			const Array &items = script->get_member_completions();

			const int start_size = arr.size();
			arr.resize(start_size + items.size());
			for (int i = start_size; i < arr.size(); i++) {
				arr[i] = items[i - start_size];
			}
		}
	}
	return arr;
}

Dictionary GDScriptTextDocument::resolve(const Dictionary &p_params) {

	lsp::CompletionItem item;
	item.load(p_params);

	lsp::CompletionParams params;
	Variant data = p_params["data"];

	const lsp::DocumentSymbol *symbol = NULL;

	if (data.get_type() == Variant::DICTIONARY) {

		params.load(p_params["data"]);
		symbol = GDScriptLanguageProtocol::get_singleton()->get_workspace().resolve_symbol(params, item.label, item.kind == lsp::CompletionItemKind::Method || item.kind == lsp::CompletionItemKind::Function);

	} else if (data.get_type() == Variant::STRING) {

		String query = data;
		int seperator_pos = query.find_last(".");
		if (seperator_pos >= 0 && seperator_pos < query.length() - 1) {

			String class_ = query.substr(0, seperator_pos);
			StringName class_name = class_;
			String member_name = query.substr(seperator_pos + 1, query.length());

			if (const ClassMembers *members = GDScriptLanguageProtocol::get_singleton()->get_workspace().native_members.getptr(class_name)) {
				if (const lsp::DocumentSymbol *const *member = members->getptr(member_name)) {
					symbol = *member;
				}
			}

			if (!symbol) {
				if (const Map<String, ExtendGDScriptParser *>::Element *E = GDScriptLanguageProtocol::get_singleton()->get_workspace().scripts.find(class_name)) {
					symbol = E->get()->get_member_symbol(member_name);
				}
			}
		}
	}

	if (symbol) {
		item.documentation = symbol->render();
	}

	if (item.kind == lsp::CompletionItemKind::Method || item.kind == lsp::CompletionItemKind::Function) {
		item.insertText = item.label + "(";
		if (symbol && symbol->detail.find(",") == -1) {
			item.insertText += ")";
		}
	} else if (item.kind == lsp::CompletionItemKind::Event) {
		if (params.context.triggerKind == lsp::CompletionTriggerKind::TriggerCharacter && (params.context.triggerCharacter == "(")) {
			const String quote_style = EDITOR_DEF("text_editor/completion/use_single_quotes", false) ? "'" : "\"";
			item.insertText = quote_style + item.label + quote_style;
		}
	}

	return item.to_json();
}

Array GDScriptTextDocument::foldingRange(const Dictionary &p_params) {
	Dictionary params = p_params["textDocument"];
	String path = params["uri"];
	Array arr;
	return arr;
}

Array GDScriptTextDocument::codeLens(const Dictionary &p_params) {
	Array arr;
	return arr;
}

Variant GDScriptTextDocument::documentLink(const Dictionary &p_params) {
	Variant ret;
	return ret;
}

Array GDScriptTextDocument::colorPresentation(const Dictionary &p_params) {
	Array arr;
	return arr;
}

Variant GDScriptTextDocument::hover(const Dictionary &p_params) {

	lsp::TextDocumentPositionParams params;
	params.load(p_params);

	const lsp::DocumentSymbol *symbol = GDScriptLanguageProtocol::get_singleton()->get_workspace().resolve_symbol(params);
	if (symbol) {

		lsp::Hover hover;
		hover.contents = symbol->render();
		return hover.to_json();

	} else if (GDScriptLanguageProtocol::get_singleton()->is_smart_resolve_enabled()) {

		Dictionary ret;
		Array contents;
		List<const lsp::DocumentSymbol *> list;
		GDScriptLanguageProtocol::get_singleton()->get_workspace().resolve_related_symbols(params, list);
		for (List<const lsp::DocumentSymbol *>::Element *E = list.front(); E; E = E->next()) {
			if (const lsp::DocumentSymbol *s = E->get()) {
				contents.push_back(s->render().value);
			}
		}
		ret["contents"] = contents;
		return ret;
	}

	return Variant();
}

Array GDScriptTextDocument::definition(const Dictionary &p_params) {
	Array arr;

	lsp::TextDocumentPositionParams params;
	params.load(p_params);

	const lsp::DocumentSymbol *symbol = GDScriptLanguageProtocol::get_singleton()->get_workspace().resolve_symbol(params);
	if (symbol) {
		lsp::Location location;
		location.uri = symbol->uri;
		location.range = symbol->range;

		const String &path = GDScriptLanguageProtocol::get_singleton()->get_workspace().get_file_path(symbol->uri);
		if (file_checker->file_exists(path)) {
			arr.push_back(location.to_json());
		}
	} else if (GDScriptLanguageProtocol::get_singleton()->is_smart_resolve_enabled()) {

		List<const lsp::DocumentSymbol *> list;
		GDScriptLanguageProtocol::get_singleton()->get_workspace().resolve_related_symbols(params, list);
		for (List<const lsp::DocumentSymbol *>::Element *E = list.front(); E; E = E->next()) {

			if (const lsp::DocumentSymbol *s = E->get()) {

				lsp::Location location;
				location.uri = s->uri;
				location.range = s->range;

				arr.push_back(location.to_json());
			}
		}
	}

	return arr;
}

GDScriptTextDocument::GDScriptTextDocument() {
	file_checker = FileAccess::create(FileAccess::ACCESS_RESOURCES);
}

GDScriptTextDocument::~GDScriptTextDocument() {
	memdelete(file_checker);
}

void GDScriptTextDocument::sync_script_content(const String &p_uri, const String &p_content) {
	String path = GDScriptLanguageProtocol::get_singleton()->get_workspace().get_file_path(p_uri);
	GDScriptLanguageProtocol::get_singleton()->get_workspace().parse_script(path, p_content);
}