/**************************************************************************/
/*  template_generator.cpp                                                */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "template_generator.h"

#include "core/config/project_settings.h"
#include "editor/translations/editor_translation.h"
#include "editor/translations/editor_translation_parser.h"

TranslationTemplateGenerator::MessageMap TranslationTemplateGenerator::parse(const Vector<String> &p_sources, bool p_add_builtin) const {
	Vector<Vector<String>> raw;

	for (const String &path : p_sources) {
		Vector<Vector<String>> parsed_from_file;

		const String &extension = path.get_extension();
		ERR_CONTINUE_MSG(!EditorTranslationParser::get_singleton()->can_parse(extension), vformat("Cannot parse file '%s': unrecognized file extension. Skipping.", path));

		EditorTranslationParser::get_singleton()->get_parser(extension)->parse_file(path, &parsed_from_file);

		for (const Vector<String> &entry : parsed_from_file) {
			ERR_CONTINUE(entry.is_empty());
			if (entry[0].is_empty()) {
				continue;
			}

			const String &msgctxt = (entry.size() > 1) ? entry[1] : String();
			const String &msgid_plural = (entry.size() > 2) ? entry[2] : String();
			const String &comment = (entry.size() > 3) ? entry[3] : String();
			const int source_line = (entry.size() > 4) ? entry[4].to_int() : 0;
			const String &location = source_line > 0 ? vformat("%s:%d", path, source_line) : path;

			raw.push_back({ entry[0], msgctxt, msgid_plural, comment, location });
		}
	}

	if (p_add_builtin) {
		for (const Vector<String> &extractable_msgids : get_extractable_message_list()) {
			raw.push_back({ extractable_msgids[0], extractable_msgids[1], extractable_msgids[2], String(), String() });
		}
	}

	if (GLOBAL_GET("application/config/name_localized").operator Dictionary().is_empty()) {
		const String &project_name = GLOBAL_GET("application/config/name");
		if (!project_name.is_empty()) {
			raw.push_back({ project_name, String(), String(), String(), String() });
		}
	}

	MessageMap result;
	for (const Vector<String> &entry : raw) {
		const String &msgid = entry[0];
		const String &msgctxt = entry[1];
		const String &plural = entry[2];
		const String &comment = entry[3];
		const String &location = entry[4];

		const Translation::MessageKey key = { msgctxt, msgid };
		MessageData &mdata = result[key];
		if (!mdata.plural.is_empty() && !plural.is_empty() && mdata.plural != plural) {
			WARN_PRINT(vformat(R"(Skipping different plural definitions for msgid "%s" msgctxt "%s": "%s" and "%s")", msgid, msgctxt, mdata.plural, plural));
			continue;
		}
		mdata.plural = plural;
		if (!location.is_empty()) {
			mdata.locations.insert(location);
		}
		if (!comment.is_empty()) {
			mdata.comments.insert(comment);
		}
	}
	return result;
}

void TranslationTemplateGenerator::generate(const String &p_file) {
	const Vector<String> files = GLOBAL_GET("internationalization/locale/translations_pot_files");
	const bool add_builtin = GLOBAL_GET("internationalization/locale/translation_add_builtin_strings_to_pot");

	const MessageMap &map = parse(files, add_builtin);
	if (map.is_empty()) {
		WARN_PRINT_ED(TTR("No translatable strings found."));
		return;
	}

	Error err;
	Ref<FileAccess> file = FileAccess::open(p_file, FileAccess::WRITE, &err);
	ERR_FAIL_COND_MSG(err != OK, "Failed to open " + p_file);

	const String ext = p_file.get_extension().to_lower();
	if (ext == "pot") {
		_write_to_pot(file, map);
	} else if (ext == "csv") {
		_write_to_csv(file, map);
	} else {
		ERR_FAIL_MSG("Unrecognized translation template file extension: " + ext);
	}
}

static void _write_pot_field(Ref<FileAccess> p_file, const String &p_name, const String &p_value) {
	p_file->store_string(p_name + " ");

	if (p_value.is_empty()) {
		p_file->store_line("\"\"");
		return;
	}

	const Vector<String> lines = p_value.split("\n");
	DEV_ASSERT(lines.size() > 0);

	const String &last_line = lines[lines.size() - 1];
	const int pot_line_count = last_line.is_empty() ? lines.size() - 1 : lines.size();

	if (pot_line_count > 1) {
		p_file->store_line("\"\"");
	}

	for (int i = 0; i < lines.size() - 1; i++) {
		p_file->store_line((lines[i] + "\n").json_escape().quote());
	}
	if (!last_line.is_empty()) {
		p_file->store_line(last_line.json_escape().quote());
	}
}

void TranslationTemplateGenerator::_write_to_pot(Ref<FileAccess> p_file, const MessageMap &p_map) const {
	const String project_name = GLOBAL_GET("application/config/name").operator String().replace("\n", "\\n");
	const Vector<String> files = GLOBAL_GET("internationalization/locale/translations_pot_files");
	String extracted_files;
	for (const String &file : files) {
		extracted_files += "# " + file.replace("\n", "\\n") + "\n";
	}
	const String header =
			"# LANGUAGE translation for " + project_name + " for the following files:\n" +
			extracted_files +
			"#\n"
			"# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.\n"
			"#\n"
			"#, fuzzy\n"
			"msgid \"\"\n"
			"msgstr \"\"\n"
			"\"Project-Id-Version: " +
			project_name +
			"\\n\"\n"
			"\"MIME-Version: 1.0\\n\"\n"
			"\"Content-Type: text/plain; charset=UTF-8\\n\"\n"
			"\"Content-Transfer-Encoding: 8-bit\\n\"\n";
	p_file->store_string(header);

	for (const KeyValue<Translation::MessageKey, MessageData> &E : p_map) {
		// Put the blank line at the start, to avoid a double at the end when closing the file.
		p_file->store_line("");

		// Write comments.
		bool is_first_comment = true;
		for (const String &comment : E.value.comments) {
			if (is_first_comment) {
				p_file->store_line("#. TRANSLATORS: " + comment.replace("\n", "\n#. "));
			} else {
				p_file->store_line("#. " + comment.replace("\n", "\n#. "));
			}
			is_first_comment = false;
		}

		// Write file locations.
		for (const String &location : E.value.locations) {
			p_file->store_line("#: " + location.trim_prefix("res://").replace("\n", "\\n"));
		}

		// Write context.
		const String msgctxt = E.key.msgctxt;
		if (!msgctxt.is_empty()) {
			p_file->store_line("msgctxt " + msgctxt.json_escape().quote());
		}

		// Write msgid.
		_write_pot_field(p_file, "msgid", E.key.msgid);

		// Write msgid_plural.
		if (E.value.plural.is_empty()) {
			p_file->store_line("msgstr \"\"");
		} else {
			_write_pot_field(p_file, "msgid_plural", E.value.plural);
			p_file->store_line("msgstr[0] \"\"");
			p_file->store_line("msgstr[1] \"\"");
		}
	}
}

static String _join_strings(const HashSet<String> &p_strings) {
	String result;
	bool is_first = true;
	for (const String &s : p_strings) {
		if (!is_first) {
			result += '\n';
		}
		result += s;
		is_first = false;
	}
	return result;
}

void TranslationTemplateGenerator::_write_to_csv(Ref<FileAccess> p_file, const MessageMap &p_map) const {
	// Avoid adding unnecessary columns.
	bool context_used = false;
	bool plural_used = false;
	bool comments_used = false;
	bool locations_used = false;
	{
		for (const KeyValue<Translation::MessageKey, MessageData> &E : p_map) {
			if (!context_used && !E.key.msgctxt.is_empty()) {
				context_used = true;
			}
			if (!plural_used && !E.value.plural.is_empty()) {
				plural_used = true;
			}
			if (!comments_used && !E.value.comments.is_empty()) {
				comments_used = true;
			}
			if (!locations_used && !E.value.locations.is_empty()) {
				locations_used = true;
			}
		}
	}

	Vector<String> header = { "key" };
	if (context_used) {
		header.push_back("?context");
	}
	if (plural_used) {
		header.push_back("?plural");
	}
	if (comments_used) {
		header.push_back("_comments");
	}
	if (locations_used) {
		header.push_back("_locations");
	}
	p_file->store_csv_line(header);

	for (const KeyValue<Translation::MessageKey, MessageData> &E : p_map) {
		Vector<String> line = { E.key.msgid };
		if (context_used) {
			line.push_back(E.key.msgctxt);
		}
		if (plural_used) {
			line.push_back(E.value.plural);
		}
		if (comments_used) {
			line.push_back(_join_strings(E.value.comments));
		}
		if (locations_used) {
			line.push_back(_join_strings(E.value.locations));
		}
		p_file->store_csv_line(line);
	}
}

TranslationTemplateGenerator *TranslationTemplateGenerator::get_singleton() {
	if (!singleton) {
		singleton = memnew(TranslationTemplateGenerator);
	}
	return singleton;
}

TranslationTemplateGenerator::~TranslationTemplateGenerator() {
	memdelete(singleton);
	singleton = nullptr;
}