import { h, Component, createRef } from 'preact'
import htm from 'htm'
import { signal } from 'preact/signals'
import { ROOT_NODE } from 'node_store'
const html = htm.bind(h)

export class NodeUI extends Component {
	constructor(props) {//{{{
		super(props)
		this.menu = signal(false)
		this.node = signal(null)
		this.nodeContent = createRef()
		this.nodeProperties = createRef()
		this.nodeModified = signal(false)
		this.keys = signal([])
		this.page = signal('node')
		this.crumbs = []
		window.addEventListener('popstate', evt => {
			if (evt.state?.hasOwnProperty('nodeUUID'))
				_notes2.current.goToNode(evt.state.nodeUUID, true)
			else
				_notes2.current.goToNode('00000000-0000-0000-0000-000000000000', true)
		})

		window.addEventListener('keydown', evt => this.keyHandler(evt))
	}//}}}
	render() {//{{{
		if (this.node.value === null)
			return

		const node = this.node.value
		document.title = node.get('Name')

		const nodeModified = this.nodeModified.value ? 'node-modified' : ''


		const crumbDivs = [
			html`<div class="crumb" onclick=${() => _notes2.current.goToNode(ROOT_NODE)}>Start</div>`
		]
		for (let i = this.crumbs.length-1; i >= 0; i--) {
			const crumbNode = this.crumbs[i]
			crumbDivs.push(html`<div class="crumb" onclick=${() => _notes2.current.goToNode(crumbNode.UUID)}>${crumbNode.get('Name')}</div>`)
		}
		if (node.UUID !== ROOT_NODE)
			crumbDivs.push(
				html`<div class="crumb" onclick=${() => _notes2.current.goToNode(node.UUID)}>${node.get('Name')}</div>`
			)

		return html`
			<div id="crumbs" onclick=${() => this.saveNode()}>
				<div class="crumbs ${nodeModified}">
					${crumbDivs}
				</div>
			</div>
			<div id="name">${node.get('Name')}</div>
			<${NodeContent} key=${node.UUID} node=${node} ref=${this.nodeContent} />
			<div id="blank"></div>
		`




		return

		let crumbs = [
			html`<div class="crumb" onclick=${() => this.goToNode(0)}>Start</div>`
		]

		crumbs = crumbs.concat(node.Crumbs.slice(0).map(node =>
			html`<div class="crumb" onclick=${() => this.goToNode(node.ID)}>${node.Name}</div>`
		).reverse())


		// Page to display
		let page = ''
		switch (this.page.value) {
			case 'node':
				if (node.ID === 0) {
					page = html`
						<div style="cursor: pointer; color: #000; text-align: center;" onclick=${() => { this.page.value = 'schedule-events' }}>Schedule events</div>
						${children.length > 0 ? html`<div class="child-nodes">${children}</div><div id="notes-version">Notes version ${window._VERSION}</div>` : html``}
					`
				} else {
					let padlock = ''
					if (node.CryptoKeyID > 0)
						padlock = html`<img src="/images/${window._VERSION}/padlock-black.svg" style="height: 24px;" />`

					page = html`
						${children.length > 0 ? html`<div class="child-nodes">${children}</div>` : html``}
						<div class="node-name">
							${node.Name} ${padlock}
						</div>
						<${NodeContent} key=${node.ID} node=${node} ref=${this.nodeContent} />
						<${NodeEvents} events=${node.ScheduleEvents.value} />
						<${Checklist} ui=${this} groups=${node.ChecklistGroups} />
						<${NodeFiles} node=${this.node.value} />
					`
				}
				break

			case 'upload':
				page = html`<${UploadUI} nodeui=${this} />`
				break

			case 'node-properties':
				page = html`<${NodeProperties} ref=${this.nodeProperties} nodeui=${this} />`
				break

			case 'keys':
				page = html`<${Keys} nodeui=${this} />`
				break

			case 'profile-settings':
				page = html`<${ProfileSettings} nodeui=${this} />`
				break

			case 'search':
				page = html`<${Search} nodeui=${this} />`
				break

			case 'schedule-events':
				page = html`<${ScheduleEventList} nodeui=${this} />`
				break
		}

		const menu = () => (this.menu.value ? html`<${Menu} nodeui=${this} />` : null)
		const checklist = () =>
			html`
				<div class="checklist" onclick=${evt => { evt.stopPropagation(); this.toggleChecklist() }}>
					<img src="/images/${window._VERSION}/${this.showChecklist() ? 'checklist-on.svg' : 'checklist-off.svg'}" />
				</div>`

		return html`
			<${menu} />
			<!--header class="${modified}" onclick=${() => this.saveNode()}>
				<div class="tree"><img src="/images/${window._VERSION}/tree.svg" onclick=${() => document.getElementById('app').classList.toggle('toggle-tree')} /></div>
				<div class="name">Notes</div>
				<div class="markdown" onclick=${evt => { evt.stopPropagation(); this.toggleMarkdown() }}><img src="/images/${window._VERSION}/${node.RenderMarkdown.value ? 'markdown.svg' : 'markdown-hollow.svg'}" /></div>
				<${checklist} />
				<div class="search"   onclick=${evt => { evt.stopPropagation(); this.showPage('search') }}><img src="/images/${window._VERSION}/search.svg" /></div>
				<div class="add"      onclick=${evt => this.createNode(evt)}><img src="/images/${window._VERSION}/add.svg" /></div>
				<div class="keys"     onclick=${evt => { evt.stopPropagation(); this.showPage('keys') }}><img src="/images/${window._VERSION}/padlock.svg" /></div>
				<div class="menu"     onclick=${evt => this.showMenu(evt)}>☰</div>
			</header-->

			<div style="display: grid; justify-items: center;">
				<div id="crumbs">
					<div class="crumbs">${crumbs}</crumbs>
				</div>
			</div>

			${page}
		`
	}//}}}
	async componentDidMount() {//{{{
		_notes2.current.goToNode(this.props.startNode.UUID, true)
		_notes2.current.tree.expandToTrunk(this.props.startNode)
	}//}}}
	setNode(node) {//{{{
		this.nodeModified.value = false
		this.node.value = node
	}//}}}
	setCrumbs(nodes) {//{{{
		this.crumbs = nodes
	}//}}}
	async saveNode() {//{{{
		if (!this.nodeModified.value)
			return

		await nodeStore.copyToNodesHistory(this.node.value)

		// Prepares the node object for saving.
		// Sets Updated value to current date and time.
		const node = this.node.value
		node.save()
		await nodeStore.add([node])
		this.nodeModified.value = false
	}//}}}

	keyHandler(evt) {//{{{
		let handled = true

		// All keybindings is Alt+Shift, since the popular browsers at the time (2023) allows to override thees.
		// Ctrl+S is the exception to using Alt+Shift, since it is overridable and in such widespread use for saving.
		// Thus, the exception is acceptable to consequent use of alt+shift.
		if (!(evt.shiftKey && evt.altKey) && !(evt.key.toUpperCase() == 'S' && evt.ctrlKey))
			return

		switch (evt.key.toUpperCase()) {
			/*
			case 'C':
				this.showPage('node')
				break

			case 'E':
				this.showPage('keys')
				break

			case 'M':
				this.toggleMarkdown()
				break

			case 'N':
				this.createNode()
				break

			case 'P':
				this.showPage('node-properties')
				break

			*/
			case 'S':
				if (this.page.value === 'node')
					this.saveNode()
				else if (this.page.value === 'node-properties')
					this.nodeProperties.current.save()
				break
			/*

			case 'U':
				this.showPage('upload')
				break

			case 'F':
				this.showPage('search')
				break
				*/

			default:
				handled = false
		}

		if (handled) {
			evt.preventDefault()
			evt.stopPropagation()
		}
	}//}}}

}

class NodeContent extends Component {
	constructor(props) {//{{{
		super(props)
		this.contentDiv = createRef()
		this.state = {
			modified: false,
		}
	}//}}}
	render({ node }) {//{{{
		let content = ''
		try {
			content = node.content()
		} catch (err) {
			return html`
				<div id="node-content" class="node-content encrypted">${err.message}</div>
			`
		}

		/*
		let element
		if (node.RenderMarkdown.value)
			element = html`<${MarkdownContent} key='markdown-content' content=${content} />`
		else
		*/
		const element = html`
				<div class="grow-wrap">
					<textarea id="node-content" class="node-content" ref=${this.contentDiv} oninput=${evt => this.contentChanged(evt)} required rows=1>${content}</textarea>
				</div>
			`

		return element
	}//}}}
	componentDidMount() {//{{{
		this.resize()
		window.addEventListener('resize', () => this.resize())

		const contentResizeObserver = new ResizeObserver(entries => {
			for (const idx in entries) {
				const w = entries[idx].contentRect.width
				document.querySelector('#crumbs .crumbs').style.width = `${w}px`
			}
		});

		const nodeContent = document.getElementById('node-content')
		contentResizeObserver.observe(nodeContent);

	}//}}}
	componentDidUpdate() {//{{{
		this.resize()
	}//}}}
	contentChanged(evt) {//{{{
		_notes2.current.nodeUI.current.nodeModified.value = true
		this.props.node.setContent(evt.target.value)
		this.resize()
	}//}}}
	resize() {//{{{
		const textarea = document.getElementById('node-content')
		if (textarea)
			textarea.parentNode.dataset.replicatedValue = textarea.value
	}//}}}
}

export class Node {
	static sort(a, b) {//{{{
		if (a.data.Name < b.data.Name) return -1
		if (a.data.Name > b.data.Name) return 0
		return 0
	}//}}}
	constructor(nodeData, level) {//{{{
		this.Level = level
		this.data = nodeData

		this.UUID = nodeData.UUID
		this.ParentUUID = nodeData.ParentUUID

		this._children_fetched = false
		this.Children = []

		this._content = this.data.Content
		this._modified = false

		/*
		this.RenderMarkdown = signal(nodeData.RenderMarkdown)
		this.Markdown = false
		this.ShowChecklist = signal(false)
		this._content = nodeData.Content
		this.Crumbs = []
		this.Files = []
		this._decrypted = false
		this._expanded = false // start value for the TreeNode component,
		this.ChecklistGroups = {}
		this.ScheduleEvents = signal([])
		// it doesn't control it afterwards.
		// Used to expand the crumbs upon site loading.
		*/
	}//}}}

	get(prop) {//{{{
		return this.data[prop]
	}//}}}
	updated() {//{{{
		// '2024-12-17T17:33:48.85939Z
		return new Date(Date.parse(this.data.Updated))
	}//}}}
	hasFetchedChildren() {//{{{
		return this._children_fetched
	}//}}}
	async fetchChildren() {//{{{
		if (this._children_fetched)
			return this.Children
		this.Children = await nodeStore.getTreeNodes(this.UUID, this.Level + 1)
		this._children_fetched = true
		return this.Children
	}//}}}
	content() {//{{{
		/* TODO - implement crypto
		if (this.CryptoKeyID != 0 && !this._decrypted)
			this.#decrypt()
		*/
		this.modified = true
		return this._content
	}//}}}

	setContent(new_content) {//{{{
		this._content = new_content
		/* TODO - implement crypto
		if (this.CryptoKeyID == 0)
			// Logic behind plaintext not being decrypted is that
			// only encrypted values can be in a decrypted state.
			this._decrypted = false
		else
			this._decrypted = true
		*/
	}//}}}
	save() {//{{{
		this.data.Content = this._content
		this.data.Updated = new Date().toISOString()
		this._modified = false
	}//}}}
}

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