/*
 *	This file is part of video_metadata.
 *
 *	video_metadata is free software: you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation, either version 3 of the License, or
 *	(at your option) any later version.
 *
 *	video_metadata is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with video_metadata.  If not, see <https://www.gnu.org/licenses/>.
 */


const SCAN_URL = 'admin.php?action=scan';
const VERIFY_URL = 'admin.php?action=verify';


function copyJSONtoDOMData(node, path_info)
{
	node.dataset.baseName = path_info.base_name;
	node.dataset.contentSize = path_info.content_size;
	node.dataset.depth = path_info.depth;
	node.dataset.fileExtension = path_info.path_extension;
	node.dataset.fullPath = path_info.full_path;
	node.dataset.mediaType = path_info.media_type;
	node.dataset.pathType = path_info.path_type;
}

function updatePathInfoStyle(node)
{
	node.classList.remove('unknown', 'movie', 'tv_show');

	if (node.dataset.pathType == 'directory') {
		node.classList.add('directory');
	} else if (node.dataset.pathType == 'file') {
		node.classList.add('file');

		if (node.dataset.mediaType != '')
			node.classList.add(node.dataset.mediaType);
	}

	if (node.dataset.mediaType == 'unknown')
		node.classList.add('unknown');
}

function updateMediaType(node, media_type)
{
	node.dataset.mediaType = media_type;
	updateRadioButtons(node, media_type)
	updatePathInfoStyle(node);

	for (let child of node.children) {
		if (child.nodeName == 'DIV')
			updateMediaType(child, media_type);
	}
}

function updateRadioButtons(node, media_type)
{
	if (media_type == 'movie') {
		node.querySelector('input[value^="tv_show"]').setAttribute('checked', false);
		node.querySelector('input[value^="movie"]').setAttribute('checked', true);
	} else if (media_type == 'tv_show') {
		node.querySelector('input[value^="movie"]').setAttribute('checked', false);
		node.querySelector('input[value^="tv_show"]').setAttribute('checked', true);
	}
}

// NOTE: recursively build DOM tree with attached data attributes and callbacks
//	for editing the data
function buildDirectoryTreeWithData(path_info)
{
	const DEPTH_NAMES = ['depth_0', 'depth_1', 'depth_2', 'depth_3', 'depth_4', 'depth_5'];

	let t = document.querySelector("#path_info_template");
	let clone = document.importNode(t.content, true);
	let sub_list = clone.querySelector('div');
	sub_list.querySelector('form span').textContent = path_info.base_name;
	sub_list.classList.add(DEPTH_NAMES[path_info.depth]);

	copyJSONtoDOMData(sub_list, path_info);
	updatePathInfoStyle(sub_list);
	updateRadioButtons(sub_list, path_info.media_type)

	// NOTE: don't display the radio buttons on top level directory
	if (path_info.depth == 0) {
		let s = sub_list.querySelector('form span');
		sub_list.appendChild(s);
		sub_list.removeChild(sub_list.querySelector('form'));
	} else {
		sub_list.querySelector('form').addEventListener('change', function(e){
			updateMediaType(sub_list, e.target.value);
		});
	}

	// NOTE: hide nested folders by default and add listener to open/close children
	if (path_info.depth > 1)
		sub_list.classList.add('hidden');

	if (path_info.depth > 0) {
		sub_list.addEventListener('click', function(e) {
			e.stopPropagation();

			if (e.target.nodeName != 'INPUT') {
				for (let div of sub_list.querySelectorAll('div'))
					div.classList.toggle('hidden');
			}
		});
	}

	for (let node of path_info.contents)
		sub_list.appendChild(buildDirectoryTreeWithData(node));

	return clone;
}

function createJSONFromDOM(node)
{
	let json = {};
	json.base_name = node.dataset.baseName;
	json.content_size = node.dataset.contentSize;
	json.depth = node.dataset.depth;
	json.path_extension = node.dataset.fileExtension;
	json.full_path = node.dataset.fullPath;
	json.media_type = node.dataset.mediaType;
	json.path_type = node.dataset.pathType;
	json.contents = [];

	return json;
}

function buildJSONFromNode(node)
{
	let json = createJSONFromDOM(node);

	if (json.media_type == "unknown" || json.media_type == "") {
		throw new Error('unknown media type, ' + json.base_name + ', at depth: ' + json.depth + '.\n');
		return null;
	}

	if (node.childNodes.length > 1) {
		for (let child of node.children) {
			if (child.nodeName == 'DIV')
				json.contents.push(buildJSONFromNode(child));
		}
	}

	return json;
}

function onScanSubmit(e)
{
	console.log('onScanSubmit');

	let errors = document.querySelector('#errors');
	let error_count = 0;
	let div = document.querySelector('#main_container div');
	let json = createJSONFromDOM(div);

	for (let node of div.children) {
		if (node.nodeName == 'DIV') {
			try {
				json.contents.push(buildJSONFromNode(node));
			} catch(e) {
				console.log(e);
				errors.appendChild(document.createTextNode(e.message));
				error_count++;
			}
		}
	}

	if (error_count == 0) {
		console.log('valid json, uploading');

		fetchPOSTJSON(VERIFY_URL, {body: json}, function(response) {
			let main_container = document.querySelector("#main_container");
			resetContainers(main_container);

			if (response.errors)
				errors.appendChild(document.createTextNode(response.message));
			else
				main_container.appendChild(document.createTextNode(response.message));

			console.log(response);
		});
	} else {
		console.log('failed upload, errors in json');
	}
}

function scanFolderResponse(data)
{
	let errors = document.querySelector('#errors');
	let info_container = document.querySelector('#info pre');
	let main_container = document.querySelector('#main_container');
	resetContainers(errors, info_container, main_container);

	if (data.errors) {
		for (let err of data.errors) {
			errors.appendChild(document.createTextNode(err));
			console.log(err);
		}
	}

	if (data.mem_usage) {
		info_container.appendChild(document.createTextNode(
			'memory usage: ' + data.mem_usage + ' bytes')
		);
	}

	if (data.path_info) {
		let b = document.createElement('button');
		b.textContent = 'Upload';
		b.addEventListener('click', onScanSubmit);
		main_container.appendChild(b);

		main_container.appendChild(buildDirectoryTreeWithData(data.path_info));
	}
}

window.onload = function () {
	if (!('fetch' in window)) {
		console.log('no fetch API');
		return;
	}

	let scan_button = document.querySelector('#scan_button');

	scan_button.addEventListener('click', function(e) {
		let info_container = document.querySelector('#info pre');
		resetContainers(info_container);
		info_container.appendChild(document.createTextNode('waiting for response...'));
		fetchJSON(SCAN_URL, scanFolderResponse);
	});
}