<script>
	// get the data from the JSON Webservices feed in +page.js
	export let data;
	const { webservices } = data;

	import { references } from '$lib/references.js';
	import { colours } from '$lib/colours.js';

	// the filters
	import { setFilter, getFilter } from '$lib/components/filter.js';
	import Filterable from '$lib/components/Filterable.svelte';
	// collapsible sections
	import CollapsibleSection from '$lib/components/CollapsibleSection.svelte';
	import Tile from '$lib/components/Tile.svelte';

	//console.log('colours: ', colours);

    //
    // digest and return useful info from the Webservices JSON feed
    function processData(webservices) {
        let stats = { 'instances': 0, 'technologies': 0, 'licenses': 0,'weak': 0, 'copyleft': 0 };
        let all = []; // all services
        let current = []; // those with active instances
        let future = []; // those that are planned
        // properties of technologies
        let category_list = [];
        let analogue_list = [];
        let license_list = [];
        // properties of instances
        let status_list = [];
        let affiliate_list = [];
        let host_list = [];

        // actual objects
        let hosts = [];
        let affiliates = [];

        //
        // just a trivial reassignment
        //let hosts = webservices.hosts;
        //
        // pull out relevant info in useful chunks.
        for (let key in webservices.technologies) {
            let tech = webservices.technologies[key];
            tech['name'] = key;
            console.log('tech '+key+' ('+tech.categories.length+'):', tech.categories);
            if (tech.hasOwnProperty('categories') && tech.categories.constructor === Array) {
                //console.log('tech '+key+' ('+tech.categories.length+'):', tech.categories);
                tech.categories.forEach(function (category, index) {
                    if (category_list.hasOwnProperty(category)) category_list[category]++;
                    else category_list[category] = 1;
                });
            }
            if (tech.hasOwnProperty('analogues') && tech.analogues.constructor === Array) {
                tech.analogues.forEach(function (analogue, index) {
                    if (analogue_list.hasOwnProperty(analogue)) analogue_list[analogue]++;
                    else analogue_list[analogue] = 1;
                });
            }
            if (tech.hasOwnProperty('license')) {
                let license = tech.license;
                if (license_list.hasOwnProperty(license)) license_list[license]++;
                else license_list[license] = 1;
            }
            if (hasInstances(tech)) {
                current.push(tech);
                //console.log(tech.name + ': ' + tech.instances.length + ' instances...');
                tech.instances.forEach(function (instance, i) {
					stats.instances++;
                    if (instance.hasOwnProperty('status')) {
                        let tag = instance.status;
                        if (status_list.hasOwnProperty(tag)) status_list[tag]++;
                        else status_list[tag] = 1;
                    }
                    if (instance.hasOwnProperty('affiliation')) {
                        let tag = instance.affiliation;

                        if (affiliate_list.hasOwnProperty(tag)) affiliate_list[tag]++;
                        else affiliate_list[tag] = 1;
                    }
                    if (instance.hasOwnProperty('host')) {
                        let tag = instance.host;
                        if (host_list.hasOwnProperty(tag)) host_list[tag]++;
                        else host_list[tag] = 1;
                    }
                });
            } else {
                future[key] = tech;
            }
            all[key] = tech;
        }
        for (let key in webservices.hosts) {
            //console.log('key: ', key);
            let host = webservices.hosts[key];
            host['name'] = key;
            //console.log('host: ', host);
            if (
                host.hasOwnProperty('domain') &&
                !(host.hasOwnProperty('status') && host.status == 'retired')
            ) {
                hosts[key] = host;
            }
        }
        for (let key in webservices.affiliates) {
            let affiliate = webservices.affiliates[key];
            affiliates[key] = affiliate;
        }

		// assign stats based on gathered data...
		stats.current = current.length;
		stats.future = future.length;
		console.log('license_list: ', license_list);
		stats.licenses = license_list.length;

        return {
            stats: stats,
            all_services: all,
            active_services: current,
            candidate_services: future,
            tech_lists: {
                category_list: category_list,
                analogue_list: analogue_list,
                license_list: license_list
            },
            instance_lists: {
                status_list: status_list,
                affiliate_list: affiliate_list,
                host_list: host_list
            },
            hosts: hosts,
            affiliates: affiliates
        };
    }

	// return an object with ob's keys ordered alphabetically, with an id from an object
	function getSortedFilter(ob) {
		let keys = [];
		let i = 0;
		let key_array = [];
		// first create a flat array.
		for (let key in ob) {
			keys.push(key);
		}
		// sort the array alphabetically
		keys.sort();
		// then create a dictionary of them
		keys.forEach(function(name) {
			key_array.push({ "id": i++, "name": name, "active": true });
		});
		return key_array;
	}

	// return true if a tech object includes valid instances
	function hasInstances(tech) {
		if (
			tech.hasOwnProperty('instances') &&
			tech.instances.constructor === Array &&
			tech.instances.length
		) return true;
		return false;
	}


	// get intersection: ref https://bobbyhadz.com/blog/javascript-get-intersection-of-two-arrays
	function getIntersection(a, b) {
		const set1 = new Set(a);
		const set2 = new Set(b);

		const intersection = [...set1].filter((element) => set2.has(element));

		return intersection;
	}


	// assign colours from a set of differentiated colours to a list of tags...
	// this one is for 'hosts'
	//
	// host_list is in the form of
	function hostColours(host_list, colours, hosts) {
		let host_array = {};
		let i = 0;

		console.log('hosts:', hosts);
		console.log('host_list:', host_list);

		for (let index in host_list) {
			console.log(host_list[index]);
			let hostname = host_list[index].name;
			if (hosts[hostname].hasOwnProperty('domain') && hosts[hostname].hasOwnProperty('affiliation')) {
				host_array[hostname] = {
					colour: colours[i++],
					domain: hosts[hostname].domain,
					affiliation: hosts[hostname].affiliation
				};
			}
		}
		return host_array;
	}

	// assign colours from a set of differentiated colours to a list of tags...
	// this one is for 'affiliates'
	function affiliateColours(affiliate_list, colours, affiliates) {
		let affiliate_result = {};
		let i = 0;

		//console.log('affiliates:', affiliates);
		console.log('affiliate_list:', affiliate_list);

		for (let index in affiliate_list) {
			//console.log('affiliate:', affiliate);
			let affiliate = affiliate_list[index].name;
			if (
				affiliates[affiliate].hasOwnProperty('name') &&
				affiliates[affiliate].hasOwnProperty('website')
			) {
				affiliate_result[affiliate] = {
					colour: colours[i++],
					name: affiliates[affiliate].name,
					website: affiliates[affiliate].website
				};
			}
		}
		return affiliate_result;
	}

	// sort technologies alphabetically by name
	function sortTechnologies(technologies) {
		return technologies.sort((a, b) => a.name.localeCompare(b.name));
	}

	// generic function to find the intersection of two arrays
	// approach ref: https://bobbyhadz.com/blog/javascript-get-intersection-of-two-arrays
	function inCommon(a, b) {
		const set1 = new Set(a);
		const set2 = new Set(b);

		const intersection = [...set1].filter((element) => set2.has(element));
		//console.log('intersection = ', intersection);
		return intersection;
	}

	// converts a filter with id, name, and active fields into an array of names
	function flattenFilter(filter) {
		let flat = [];
	    if (filter.constructor === Array) {
			filter.forEach(function(e) { if (e.active) flat.push(e.name) });
	    }
		return flat;
	}

	// filter technologies based on a list of Categories
	function filterTechnologiesByCategoryList(technologies, list) {
		//console.log('looking for tech in categories: ', list);
		const included = [];
		technologies.forEach(function (tech) {
			if (hasInstances(tech)) {
				const intersection = inCommon(tech.categories, list);
				console.log('for tech: ', tech.name);
				console.log('categories: ', tech.categories);
				console.log('list: ', list);
				console.log('intersection: ', intersection);
				if (intersection && intersection.constructor === Array) {
					//console.log('found intersection!', intersection.constructor);
					console.log('intersection length: ', intersection.length);
					if (intersection.length > 0) {
						//console.log('including tech: ', tech);
						included.push(tech);
					}
				} else {
					console.log('intersection not array');
				}
			}
		});
		console.log('found ' + included.length + ' technologies.');
		return included;
	}

	const results = processData(webservices);

	//const technologies = webservices.technologies;
	//console.log(technologies);

	// set up filters for each type
	setFilter('categories');
	setFilter('analogues');
	setFilter('licenses');
	setFilter('statuses');
	setFilter('affiliates');
	setFilter('hosts');

	// define the handle for each writable
	const categoryFilter = getFilter('categories');
	const analogueFilter = getFilter('analogues');
	const licenseFilter = getFilter('licenses');
	const statusFilter = getFilter('statuses');
	const affiliateFilter = getFilter('affiliates');
	const hostFilter = getFilter('hosts');

	// populate the writable with actual data
	$categoryFilter = getSortedFilter(results.tech_lists.category_list);
	$analogueFilter = getSortedFilter(results.tech_lists.analogue_list);
	$licenseFilter = getSortedFilter(results.tech_lists.license_list);
	$statusFilter = getSortedFilter(results.instance_lists.status_list);
	$affiliateFilter = getSortedFilter(results.instance_lists.affiliate_list);
	$hostFilter = getSortedFilter(results.instance_lists.host_list);

	const hosts = results.hosts;
	console.log('host_data: ', results.hosts);
	const affiliates = results.affiliates;
	console.log('affiliate_data: ', results.affiliates);
	const host_colours = hostColours($hostFilter, colours, hosts);
	console.log('host_colours:', host_colours);
	colours.sort();
	const affiliate_colours = affiliateColours($affiliateFilter, colours, affiliates);
	console.log('affiliate_colours:',affiliate_colours);

	let filteredTechnologies;
	let technologies;

	// reactive stuff...
	$: {
		//console.log('about to filterTechnologiesByCategoryList');
		filteredTechnologies = filterTechnologiesByCategoryList(results.active_services, flattenFilter($categoryFilter));
		//filteredTechnologies = filterTechnologiesByCategoryList(results.all_services, flattenFilter($categoryFilter));
		const technologies = sortTechnologies(filteredTechnologies);
	}

	/*function flipOn(list, id) {
	    console.log('list: ' + list + ', id: ' + id);
	    return true;
	}*/

</script>

<div class="webservices">
    <div class="header">
		<div class="introduction">
			<h1>Web Services</h1>
			<p>This sites exists to provide an 'always-up-to-date', in-depth description of the <a
					href="https://tech.oeru.org/foss-libresoftware-its-about-clarity-and-values"
					title="What do I mean by 'libre' software?">libre software</a> web services <a href="https://davelane.nz" title="Who is this Dave Lane character?">I</a> have set
				up and maintain.
			</p>

		</div>
		<div class="summary">
			<h2>Statistics</h2>
			<ul>
				<li>Number of individual services: {results.stats.instances}</li>
				<li>Number of individual technologies: {results.stats.current}</li>
				<li>Number of new technologies to be added: {results.stats.future}</li>
				<li>Number of libre licenses used by these technologies: {results.stats.licenses}</li>
				<li>&nbsp;&nbsp;'weak' corporate-exploitation-friendly open source licenses : {results.stats.weak}</li>
				<li>&nbsp;&nbsp;'strong' user-protecting copyleft licenses: {results.stats.copyleft}</li>
				<li>Total number of services: {results.stats.instances}</li>
			</ul>
		</div>
	</div>
	<CollapsibleSection  headerText={'Filters'}>
		<div class="filters">
			<CollapsibleSection  headerText={'Software Catergory Filter'}>
				<div class="filter-group categories">
					<Filterable filterValues={categoryFilter}
						histogram={results.tech_lists.category_list} context={'categories'}>
						<h2 slot="h2">Categories</h2>
					</Filterable>
				</div>
			</CollapsibleSection>
			<CollapsibleSection  headerText={'Software Analogue Filter'}>
				<div class="filter-group analogues">
					<Filterable filterValues={analogueFilter}
						histogram={results.tech_lists.analogue_list} context={'analogues'}>
						<h2 slot="h2">Analogues</h2>
					</Filterable>
				</div>
			</CollapsibleSection>
			<CollapsibleSection  headerText={'License Filter'}>
				<div class="filter-group licenses">
					<Filterable filterValues={licenseFilter}
						histogram={results.tech_lists.license_list} context={'licenses'}>
						<h2 slot="h2">Open Source & Copyleft Licenses</h2>
					</Filterable>
				</div>
			</CollapsibleSection>
			<CollapsibleSection  headerText={'Service Status Filter'}>
				<div class="filter-group statuses">
					<Filterable filterValues={statusFilter}
						histogram={results.instance_lists.status_list} context={'statuses'}>
						<h2 slot="h2">Statuses</h2>
					</Filterable>
				</div>
			</CollapsibleSection>
			<CollapsibleSection  headerText={'Service Affiliates Filter'}>
				<div class="filter-group affilates">
					<Filterable filterValues={affiliateFilter}
						histogram={results.instance_lists.affiliate_list} context={'affiliates'}>
						<h2 slot="h2">Affiliates</h2>
					</Filterable>
				</div>
			</CollapsibleSection>
			<CollapsibleSection  headerText={'Service Host filter'}>
				<div class="filter-group hosts">
					<Filterable filterValues={hostFilter}
						histogram={results.instance_lists.host_list} context={'hosts'}>
						<h2 slot="h2">Hosts</h2>
					</Filterable>
				</div>
			</CollapsibleSection>
		</div>
	</CollapsibleSection>
	<div class="tiles">
		{#each filteredTechnologies as technology}
		<Tile technology={technology} affiliate_colours={affiliate_colours} />
		{/each}
	</div>
</div>

<style>
	.webservices {
		display: grid;
		margin: 0 auto 3em auto;
		padding: 0;
		position: relative;
	}
	.introduction {
	    width: 50%;
	}
	.summary {
		border-radius: 15px;
	    /*position: absolute;
	    right: 20px;*/
	    background-color: #ccc;
	    /*display: block;*/
	    width: 50%;
	    border: 2px #aaa solid;
	    margin: 0;
	    padding: 0 20px;
	}
/*	.filters { margin-bottom: 1em;}
	.filters .tags {
		margin: 1em 0;
		display: block;
	}*/
	.tiles {
		/*display: grid;
		grid-gap: 15px;
		grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));*/
		/*grid-template-columns: repeat(auto-fit);*/
	}
</style>
