/* Copyright 2021 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * A subset of the l10n strings in the `l10n/en-US/viewer.properties` file.
 */
const DEFAULT_L10N_STRINGS = {
	of_pages: 'of {{pagesCount}}',
	page_of_pages: '({{pageNumber}} of {{pagesCount}})',

	document_properties_kb: '{{size_kb}} KB ({{size_b}} bytes)',
	document_properties_mb: '{{size_mb}} MB ({{size_b}} bytes)',
	document_properties_date_string: '{{date}}, {{time}}',
	document_properties_page_size_unit_inches: 'in',
	document_properties_page_size_unit_millimeters: 'mm',
	document_properties_page_size_orientation_portrait: 'portrait',
	document_properties_page_size_orientation_landscape: 'landscape',
	document_properties_page_size_name_a3: 'A3',
	document_properties_page_size_name_a4: 'A4',
	document_properties_page_size_name_letter: 'Letter',
	document_properties_page_size_name_legal: 'Legal',
	document_properties_page_size_dimension_string:
		'{{width}} × {{height}} {{unit}} ({{orientation}})',
	document_properties_page_size_dimension_name_string:
		'{{width}} × {{height}} {{unit}} ({{name}}, {{orientation}})',
	document_properties_linearized_yes: 'Yes',
	document_properties_linearized_no: 'No',

	print_progress_percent: '{{progress}}%',

	'toggle_sidebar.title': 'Toggle Sidebar',
	'toggle_sidebar_notification2.title':
		'Toggle Sidebar (document contains outline/attachments/layers)',

	additional_layers: 'Additional Layers',
	page_landmark: 'Page {{page}}',
	thumb_page_title: 'Page {{page}}',
	thumb_page_canvas: 'Thumbnail of Page {{page}}',

	find_reached_top: 'Reached top of document, continued from bottom',
	find_reached_bottom: 'Reached end of document, continued from top',
	'find_match_count[one]': '{{current}} of {{total}} match',
	'find_match_count[other]': '{{current}} of {{total}} matches',
	'find_match_count_limit[one]': 'More than {{limit}} match',
	'find_match_count_limit[other]': 'More than {{limit}} matches',
	find_not_found: 'Phrase not found',

	error_version_info: 'PDF.js v{{version}} (build: {{build}})',
	error_message: 'Message: {{message}}',
	error_stack: 'Stack: {{stack}}',
	error_file: 'File: {{file}}',
	error_line: 'Line: {{line}}',
	rendering_error: 'An error occurred while rendering the page.',

	page_scale_width: 'Page Width',
	page_scale_fit: 'Page Fit',
	page_scale_auto: 'Automatic Zoom',
	page_scale_actual: 'Actual Size',
	page_scale_percent: '{{scale}}%',

	loading: 'Loading…',
	loading_error: 'An error occurred while loading the PDF.',
	invalid_file_error: 'Invalid or corrupted PDF file.',
	missing_file_error: 'Missing PDF file.',
	unexpected_response_error: 'Unexpected server response.',

	printing_not_supported:
		'Warning: Printing is not fully supported by this browser.',
	printing_not_ready: 'Warning: The PDF is not fully loaded for printing.',
	web_fonts_disabled:
		'Web fonts are disabled: unable to use embedded PDF fonts.',

	free_text_default_content: 'Enter text…',
	editor_free_text_aria_label: 'FreeText Editor',
	editor_ink_aria_label: 'Ink Editor',
	editor_ink_canvas_aria_label: 'User-created image',
};

function getL10nFallback(key, args) {
	switch (key) {
		case 'find_match_count':
			key = `find_match_count[${args.total === 1 ? 'one' : 'other'}]`;
			break;
		case 'find_match_count_limit':
			key = `find_match_count_limit[${
				args.limit === 1 ? 'one' : 'other'
			}]`;
			break;
	}
	return DEFAULT_L10N_STRINGS[key] || '';
}

const PARTIAL_LANG_CODES = {
	en: 'en-US',
	es: 'es-ES',
	fy: 'fy-NL',
	ga: 'ga-IE',
	gu: 'gu-IN',
	hi: 'hi-IN',
	hy: 'hy-AM',
	nb: 'nb-NO',
	ne: 'ne-NP',
	nn: 'nn-NO',
	pa: 'pa-IN',
	pt: 'pt-PT',
	sv: 'sv-SE',
	zh: 'zh-CN',
};

// Try to support "incompletely" specified language codes (see issue 13689).
function fixupLangCode(langCode) {
	return PARTIAL_LANG_CODES[langCode?.toLowerCase()] || langCode;
}

// Replaces {{arguments}} with their values.
function formatL10nValue(text, args) {
	if (!args) {
		return text;
	}
	return text.replace(/\{\{\s*(\w+)\s*\}\}/g, (all, name) => {
		return name in args ? args[name] : '{{' + name + '}}';
	});
}

/**
 * No-op implementation of the localization service.
 * @implements {IL10n}
 */
const NullL10n = {
	async getLanguage() {
		return 'en-us';
	},

	async getDirection() {
		return 'ltr';
	},

	async get(key, args = null, fallback = getL10nFallback(key, args)) {
		return formatL10nValue(fallback, args);
	},

	async translate(element) {},
};

export { fixupLangCode, getL10nFallback, NullL10n };