import { MessageBus } from '@mbus'

export class Application {
	constructor(records) {// {{{
		window._mbus = new MessageBus()
		this.settings = new Settings()
		this.records = this.parseRecords(records)
		this.topFolder = new Folder(this, 'root')
		this.recordsTree = null
		this.settingsIcon = null

		this.renderFolders()
		this.render()
	}// }}}
	parseRecords(recordsData) {// {{{
		const records = recordsData.map(d => new Record(d))
		return records
	}// }}}

	// cleanFolders removes all records from all folders.
	// renderFolders can then put moved records in the correct
	// (or newly created) folders again when record names are updated.
	cleanFolders(folder) {// {{{
		if (folder === undefined)
			folder = this.topFolder

		folder.records = []
		folder.subfolders.forEach((folder, _label) => {
			this.cleanFolders(folder)
		})
	}// }}}
	renderFolders() {// {{{
		this.records.sort(this.sortRecords)


		// rec: for example www.google.com
		for (const rec of this.records) {
			// com.google (reverse and remove wwww)
			const labels = rec.labels().reverse().slice(0, -1)

			// Start each record from the top and iterate through all its labels
			// except the first one since that would be the actual record.
			let currFolder = this.topFolder
			let accFolderLabels = []
			for (const i in labels) {
				const label = labels[i]

				// The accumulated name is used to create each folder as the record progresses.
				accFolderLabels.push(label)
				const accFolderName = accFolderLabels.map(v => v).reverse().join('.')

				// A new folder is created only when it doesn't exist
				// to be able to update them when necessary.
				let folder = currFolder.subfolders.get(label)
				if (folder === undefined) {
					folder = new Folder(this, accFolderName)
					currFolder.subfolders.set(label, folder)
				}
				currFolder = folder

			}
			// Add the record to the innermost folder
			currFolder.addRecord(rec)
		}
	}// }}}
	sortFolders(a, b) {// {{{
		const aLabels = a.labels().reverse()
		const bLabels = b.labels().reverse()

		for (let i = 0; i < aLabels.length && i < bLabels.length; i++) {
			if (aLabels[i] < bLabels[i])
				return -1
			if (aLabels[i] > bLabels[i])
				return 1
		}

		if (a.length < b.length) return 1
		if (a.length > b.length) return -1

		return 0
	}// }}}
	sortRecords(a, b) {// {{{
		const aLabels = a.labels().reverse()
		const bLabels = b.labels().reverse()

		for (let i = 0; i < aLabels.length && i < bLabels.length; i++) {
			if (aLabels[i] < bLabels[i])
				return -1
			if (aLabels[i] > bLabels[i])
				return 1
		}

		return 0
	}// }}}
	render() {// {{{
		if (this.recordsTree == null) {
			this.recordsTree = document.createElement('div')
			this.recordsTree.id = 'records-tree'

			this.settingsIcon = document.createElement('img')
			this.settingsIcon.id = 'settings-icon'
			this.settingsIcon.src = `/images/${_VERSION}/icon_settings.svg`
			this.settingsIcon.addEventListener('click', () => new SettingsDialog(this).show())

			document.body.appendChild(this.recordsTree)
			document.body.appendChild(this.settingsIcon)
		}
		//this.recordsTree.replaceChildren()

		// Top root folder doesn't have to be shown.
		const folders = Array.from(this.topFolder.subfolders.values())
		folders.sort(this.sortFolders)

		for (const folder of folders)
			this.recordsTree.append(folder.toElement())

		// Subscribe to settings update since the elements they will change
		// exists now.
		_mbus.subscribe('settings_updated', event => this.handlerSettingsUpdated(event.detail))
		this.setBoxedFolders(this.settings.get('boxed_folders'))

	}// }}}
	handlerTop(event) {// {{{
		const topEl = event.target.closest('.top')

		let records, types, values
		if (topEl.classList.contains('open')) {
			records = document.querySelectorAll(`[data-top$="${topEl.dataset.self}"]`)
			types = document.querySelectorAll(`[data-top$="${topEl.dataset.self}"] + .type`)
			values = document.querySelectorAll(`[data-top$="${topEl.dataset.self}"] + .type + .value`)

			for (const r of records) {
				r.classList.remove('show')
				r.classList.remove('open')
			}

			for (const r of types)
				r.classList.remove('show')
			for (const r of values)
				r.classList.remove('show')

			topEl.classList.remove('open')
		} else {
			if (event.shiftKey) {
				records = document.querySelectorAll(`[data-top$="${topEl.dataset.self}"]`)
				types = document.querySelectorAll(`[data-top$="${topEl.dataset.self}"] + .type`)
				values = document.querySelectorAll(`[data-top$="${topEl.dataset.self}"] + .type + .value`)
			} else {
				records = document.querySelectorAll(`[data-top="${topEl.dataset.self}"]`)
				types = document.querySelectorAll(`[data-top="${topEl.dataset.self}"] + .type`)
				values = document.querySelectorAll(`[data-top="${topEl.dataset.self}"] + .type + .value`)
				console.log(records)
			}

			for (const r of records) {
				r.classList.add('show')
				if (event.shiftKey && r.classList.contains('top'))
					r.classList.add('open')
			}
			for (const r of types)
				r.classList.add('show')
			for (const r of values)
				r.classList.add('show')

			topEl.classList.add('open')
		}


	}// }}}
	handlerSettingsUpdated({ key, value }) {// {{{
		if (key == 'boxed_folders') {
			this.setBoxedFolders(value)
		}
	}// }}}
	setBoxedFolders(state) {// {{{
		if (state)
			document.body.classList.add('boxed-folders')
		else
			document.body.classList.remove('boxed-folders')
	}// }}}
}

class Folder {
	constructor(app, name) {// {{{
		this.application = app
		this.open = false
		this.folderName = name
		this.subfolders = new Map()
		this.records = []

		this.div = null
		this.divSubfolders = null
		this.divRecords = null
	}// }}}
	name() {// {{{
		return this.folderName.toLowerCase()
	}// }}}
	labels() {// {{{
		return this.name().split('.')
	}// }}}
	addRecord(rec) {// {{{
		this.records.push(rec)
	}// }}}
	openFolder(recursive) {// {{{
		this.open = true
		this.div.classList.add('open')
		this.div.classList.remove('closed')

		if (recursive)
			this.subfolders.forEach(folder => folder.openFolder(recursive))
	}// }}}
	closeFolder(recursive) {// {{{
		this.open = false
		this.div.classList.remove('open')
		this.div.classList.add('closed')

		if (recursive)
			this.subfolders.forEach(folder => folder.closeFolder(recursive))
	}// }}}
	toggleFolder(event) {// {{{
		event.stopPropagation()

		if (this.open)
			this.closeFolder(event.shiftKey)
		else
			this.openFolder(event.shiftKey)
	}// }}}
	toElement() {// {{{
		if (this.div === null) {
			this.div = document.createElement('div')
			this.div.classList.add('folder')
			this.div.classList.add(this.open ? 'open' : 'closed')
			if (this.labels().length == 1)
				this.div.classList.add('top-most')
			this.div.dataset.top = this.labels().slice(1).join('.')
			this.div.dataset.self = this.name()

			const firstLabel = this.labels()[0]
			const restLabels = this.labels().slice(1).join('.')

			this.div.innerHTML = `
				<div class="label">
					<img class="closed" src="/images/${_VERSION}/icon_folder.svg">
					<img class="open"   src="/images/${_VERSION}/icon_folder_open.svg">
					<span>${firstLabel}</span><span>${restLabels != '' ? '.' + restLabels : ''}</span>
				</div>
				<div class="subfolders"></div>
				<div class="records"></div>
			`
			this.divSubfolders = this.div.querySelector('.subfolders')
			this.divRecords = this.div.querySelector('.records')

			this.div.querySelector('.label').addEventListener('click', event => this.toggleFolder(event))
		}


		// Subfolders are refreshed.
		this.divSubfolders.replaceChildren()
		const subfolders = Array.from(this.subfolders.values())
		subfolders.sort(this.application.sortFolders)

		for (const folder of subfolders)
			this.divSubfolders.append(folder.toElement())

		// Records are refreshed.
		this.divRecords.replaceChildren()
		for (const rec of Array.from(this.records))
			this.divRecords.append(...rec.render())

		return this.div
	}// }}}
}

class Record {
	constructor(data) {// {{{
		this.data = data

		this.imgIcon = null
		this.divFQDN = null
		this.divType = null
		this.divValue = null
		this.divSeparator = null
	}// }}}

	id() {// {{{
		return this.data['.id']
	}// }}}
	disabled() {// {{{
		return this.data.Disabled === 'true'
	}// }}}
	dynamic() {// {{{
		return this.data.Dynamic === 'true'
	}// }}}
	name() {// {{{
		return this.data.Name.toLowerCase()
	}// }}}
	ttl() {// {{{
		return this.data.TTL
	}// }}}
	type() {// {{{
		return this.data.Type.toUpperCase()
	}// }}}
	value() {// {{{
		return this.data.ParsedValue
	}// }}}
	matchSubdomain() {// {{{
		return this.data.MatchSubdomain === 'true'
	}// }}}
	labels() {// {{{
		return this.name().split('.')
	}// }}}

	copy(el, text) {// {{{
		el.classList.add('copy')
		navigator.clipboard.writeText(text)
		setTimeout(() => el.classList.remove('copy'), 200)
	}// }}}
	edit() {// {{{
		new RecordDialog(this).show()
	}// }}}
	set(key, value) {// {{{
		if (key == 'Name') {
			if (value.slice(0, 2) == '*.') {
				this.data['Name'] = value.slice(2)
				this.data['MatchSubdomain'] = 'true'
			} else {
				this.data['Name'] = value
				this.data['MatchSubdomain'] = 'false'
			}
			return
		}

		this.data[key] = value
	}// }}}
	render() {// {{{
		if (this.divFQDN === null) {
			this.imgIcon = document.createElement('img')
			this.divFQDN = document.createElement('div')
			this.divType = document.createElement('div')
			this.divValue = document.createElement('div')
			this.divSeparator = document.createElement('div')

			this.imgIcon.src = `/images/${_VERSION}/icon_record.svg`
			this.divFQDN.classList.add('fqdn')
			this.divType.classList.add('type')
			this.divValue.classList.add('value')
			this.divSeparator.classList.add('separator')

			this.divFQDN.innerHTML = `
				<span class="subdomains">*.</span>
				<span class="first-label"></span>
				<span class="rest-label"></span>
			`

			this.divFQDN.addEventListener('click', event => {
				if (event.shiftKey)
					this.copy(event.target.closest('.fqdn'), this.name())
				else
					this.edit()
			})

			this.divValue.addEventListener('click', event => {
				if (event.shiftKey)
					this.copy(event.target.closest('.value'), this.value())
				else
					this.edit()
			})
		}

		// FQDN is updated.
		if (this.matchSubdomain())
			this.divFQDN.classList.add('match-subdomains')
		else
			this.divFQDN.classList.remove('match-subdomains')

		const fl = this.labels()[0]
		const rl = this.labels().slice(1).join('.')
		this.divFQDN.querySelector('.first-label').innerText = fl
		this.divFQDN.querySelector('.rest-label').innerText = rl != '' ? `.${rl}` : ''

		this.divType.innerText = this.type()
		this.divValue.innerText = this.value()

		return [this.imgIcon, this.divFQDN, this.divType, this.divValue, this.divSeparator]
	}// }}}
	save() {// {{{
		fetch('/record/save', {
			method: 'POST',
			body: JSON.stringify(this.data),
		})
			.then(data => data.json())
			.then(json => {
				if (!json.OK) {
					alert(json.Error)
					return
				}
				_app.cleanFolders()
				_app.renderFolders()
				_app.render()
			})
	}// }}}
}

class RecordDialog {
	constructor(record) {// {{{
		this.record = record
	}// }}}

	show() {// {{{
		this.dlg = document.createElement('dialog')
		this.dlg.id = "record-dialog"
		this.dlg.innerHTML = `
			<div>Name</div>
			<input type="text" class="name">

			<div>Type</div>
			<select class="type">
				<option>A</option>
				<option>AAAA</option>
				<option>CNAME</option>
				<option>FWD</option>
				<option>NS</option>
				<option>NXDOMAIN</option>
				<option>TXT</option>
			</select>

			<div>Value</div>
			<input type="text" class="value">

			<div>TTL</div>
			<input type="text" class="ttl">

			<div class="buttons">
				<button class="save">Save</button>
				<button class="close">Close</button>
			</div>
		`

		if (this.record.matchSubdomain())
			this.dlg.querySelector('.name').value = '*.' + this.record.name()
		else
			this.dlg.querySelector('.name').value = this.record.name()

		this.dlg.querySelector('.type').value = this.record.type()
		this.dlg.querySelector('.value').value = this.record.value()
		this.dlg.querySelector('.ttl').value = this.record.ttl();

		['.name', '.type', '.value', '.ttl'].forEach(v =>
			this.dlg.querySelector(v).addEventListener('keydown', event => this.enterKeyHandler(event))
		)

		this.dlg.querySelector('.save').addEventListener('click', () => this.save())
		this.dlg.querySelector('.close').addEventListener('click', () => this.dlg.close())

		this.dlg.addEventListener('close', () => this.dlg.remove())
		document.body.appendChild(this.dlg)
		this.dlg.showModal()
	}// }}}
	enterKeyHandler(event) {// {{{
		if (event.key == "Enter")
			this.save()
	}// }}}
	save() {// {{{
		this.record.set('Name', this.dlg.querySelector('.name').value)
		this.record.set('Type', this.dlg.querySelector('.type').value)
		this.record.set('ParsedValue', this.dlg.querySelector('.value').value)
		this.record.set('TTL', this.dlg.querySelector('.ttl').value)
		this.record.render()
		this.record.save()
		this.dlg.close()
	}// }}}
}

class Settings {
	constructor() {// {{{
		this.settings = new Map([
			['boxed_folders', true],
		])

		// Read any configured settings from local storage, but keeping default value
		// if not set.
		this.settings.forEach((_v, key) => {
			const configuredValue = localStorage.getItem(key)
			if (configuredValue !== null)
				this.settings.set(key, JSON.parse(configuredValue))
		})
	}// }}}
	set(key, value) {// {{{
		this.settings.set(key, value)
		localStorage.setItem(key, JSON.stringify(value))
		_mbus.dispatch('settings_updated', { key, value })
	}// }}}
	get(key) {// {{{
		return this.settings.get(key)
	}// }}}
}

class SettingsDialog {
	constructor(app) {// {{{
		this.application = app

		this.dlg = null
		this.elBoxedFolders = null
	}// }}}
	show() {// {{{
		this.dlg = document.createElement('dialog')
		this.dlg.id = 'settings-dialog'

		this.dlg.innerHTML = `
			<input type="checkbox" id="boxed-folders"> <label for="boxed-folders">Boxed folders</label>
			<div class="buttons">
				<button class="save">Save</button>
			</div>
		`

		const boxedFolders = this.application.settings.get('boxed_folders')
		this.elBoxedFolders = this.dlg.querySelector('#boxed-folders')
		this.elBoxedFolders.checked = boxedFolders

		// Event listeners are connected.
		this.dlg.querySelector('.save').addEventListener('click', () => this.save())
		this.dlg.addEventListener('close', () => this.dlg.remove())

		// Can't show a dialog that doesn't exist in DOM.
		document.body.appendChild(this.dlg)
		this.dlg.showModal()
	}// }}}
	save() {// {{{
		this.application.settings.set('boxed_folders', this.elBoxedFolders.checked)
		this.dlg.close()
	}// }}}
}