Ext.define('PVE.form.CorosyncLinkEditorController', {
    extend: 'Ext.app.ViewController',
    alias: 'controller.pveCorosyncLinkEditorController',

    addLinkIfEmpty: function() {
	let view = this.getView();
	if (view.items || view.items.length === 0) {
	    this.addLink();
	}
    },

    addEmptyLink: function() {
	this.addLink(); // discard parameters to allow being called from 'handler'
    },

    addLink: function(link) {
	let me = this;
	let view = me.getView();
	let vm = view.getViewModel();

	let linkCount = vm.get('linkCount');
	if (linkCount >= vm.get('maxLinkCount')) {
	    return;
	}

	link = link || {};

	if (link.number === undefined) {
	    link.number = me.getNextFreeNumber();
	}
	if (link.value === undefined) {
	    link.value = me.getNextFreeNetwork();
	}

	let linkSelector = Ext.create('PVE.form.CorosyncLinkSelector', {
	    maxLinkNumber: vm.get('maxLinkCount') - 1,
	    allowNumberEdit: vm.get('allowNumberEdit'),
	    allowBlankNetwork: link.allowBlank,
	    initNumber: link.number,
	    initNetwork: link.value,
	    text: link.text,
	    emptyText: link.emptyText,

	    // needs to be set here, because we need to update the viewmodel
	    removeBtnHandler: function() {
		let curLinkCount = vm.get('linkCount');

		if (curLinkCount <= 1) {
		    return;
		}

		vm.set('linkCount', curLinkCount - 1);

		// 'this' is the linkSelector here
		view.remove(this);

		me.updateDeleteButtonState();
	    },
	});

	view.add(linkSelector);

	linkCount++;
	vm.set('linkCount', linkCount);

	me.updateDeleteButtonState();
    },

    // ExtJS trips on binding this for some reason, so do it manually
    updateDeleteButtonState: function() {
	let view = this.getView();
	let vm = view.getViewModel();

	let disabled = vm.get('linkCount') <= 1;

	let deleteButtons = view.query('button[cls=removeLinkBtn]');
	Ext.Array.each(deleteButtons, btn => {
	    btn.setDisabled(disabled);
	});
    },

    getNextFreeNetwork: function() {
	let view = this.getView();
	let vm = view.getViewModel();

	let networksInUse = view.query('proxmoxNetworkSelector').map(selector => selector.value);

	for (const network of vm.get('networks')) {
	    if (!networksInUse.includes(network)) {
		return network;
	    }
	}
	return undefined; // default to empty field, user has to set up link manually
    },

    getNextFreeNumber: function() {
	let view = this.getView();
	let vm = view.getViewModel();

	let numbersInUse = view.query('numberfield').map(field => field.value);

	for (let i = 0; i < vm.get('maxLinkCount'); i++) {
	    if (!numbersInUse.includes(i)) {
		return i;
	    }
	}
	// all numbers in use, this should never happen since add button is disabled automatically
	return 0;
    },
});

Ext.define('PVE.form.CorosyncLinkSelector', {
    extend: 'Ext.panel.Panel',
    xtype: 'pveCorosyncLinkSelector',

    mixins: ['Proxmox.Mixin.CBind'],
    cbindData: [],

    // config
    maxLinkNumber: 7,
    allowNumberEdit: true,
    allowBlankNetwork: false,
    removeBtnHandler: undefined,
    emptyText: '',

    // values
    initNumber: 0,
    initNetwork: '',
    text: '',

    layout: 'hbox',
    bodyPadding: 5,
    border: 0,

    items: [
	{
	    xtype: 'displayfield',
	    fieldLabel: 'Link',
	    cbind: {
		hidden: '{allowNumberEdit}',
		value: '{initNumber}',
	    },
	    width: 45,
	    labelWidth: 30,
	    allowBlank: false,
	},
	{
	    xtype: 'numberfield',
	    fieldLabel: 'Link',
	    cbind: {
		maxValue: '{maxLinkNumber}',
		hidden: '{!allowNumberEdit}',
		value: '{initNumber}',
	    },
	    width: 80,
	    labelWidth: 30,
	    minValue: 0,
	    submitValue: false, // see getSubmitValue of network selector
	    allowBlank: false,
	},
	{
	    xtype: 'proxmoxNetworkSelector',
	    cbind: {
		allowBlank: '{allowBlankNetwork}',
		value: '{initNetwork}',
		emptyText: '{emptyText}',
	    },
	    autoSelect: false,
	    valueField: 'address',
	    displayField: 'address',
	    width: 220,
	    margin: '0 5px 0 5px',
	    getSubmitValue: function() {
		let me = this;
		// link number is encoded into key, so we need to set field name before value retrieval
		let linkNumber = me.prev('numberfield').getValue(); // always the correct one
		me.name = 'link' + linkNumber;
		return me.getValue();
	    },
	},
	{
	    xtype: 'button',
	    iconCls: 'fa fa-trash-o',
	    cls: 'removeLinkBtn',
	    cbind: {
		hidden: '{!allowNumberEdit}',
	    },
	    handler: function() {
		let me = this;
		let parent = me.up('pveCorosyncLinkSelector');
		if (parent.removeBtnHandler !== undefined) {
		    parent.removeBtnHandler();
		}
	    },
	},
	{
	    xtype: 'label',
	    margin: '-1px 0 0 5px',

	    // for muted effect
	    cls: 'x-form-item-label-default',

	    cbind: {
		text: '{text}',
	    },
	},
    ],

    initComponent: function() {
	let me = this;

	me.callParent();

	let numSelect = me.down('numberfield');
	let netSelect = me.down('proxmoxNetworkSelector');

	numSelect.validator = me.createNoDuplicatesValidator(
		'numberfield',
		gettext("Duplicate link number not allowed."),
	);

	netSelect.validator = me.createNoDuplicatesValidator(
		'proxmoxNetworkSelector',
		gettext("Duplicate link address not allowed."),
	);
    },

    createNoDuplicatesValidator: function(queryString, errorMsg) { // linkSelector generator
	let view = this; // eslint-disable-line consistent-this
	/** @this is the field itself, as the validator this is called from scopes it that way */
	return function(val) {
	    let me = this;
	    let form = view.up('form');
	    let linkEditor = view.up('pveCorosyncLinkEditor');

	    if (!form.validating) {
		// avoid recursion/double validation by setting temporary states
		me.validating = true;
		form.validating = true;

		// validate all other fields as well, to always mark both
		// parties involved in a 'duplicate' error
		form.isValid();

		form.validating = false;
		me.validating = false;
	    } else if (me.validating) {
		// we'll be validated by the original call in the other if-branch, avoid double work
		return true;
	    }

	    if (val === undefined || (val instanceof String && val.length === 0)) {
		return true; // let this be caught by allowBlank, if at all
	    }

	    let allFields = linkEditor.query(queryString);
	    for (const field of allFields) {
		if (field !== me && String(field.getValue()) === String(val)) {
		    return errorMsg;
		}
	    }
	    return true;
	};
    },
});

Ext.define('PVE.form.CorosyncLinkEditor', {
    extend: 'Ext.panel.Panel',
    xtype: 'pveCorosyncLinkEditor',

    controller: 'pveCorosyncLinkEditorController',

    // only initial config, use setter otherwise
    allowNumberEdit: true,

    viewModel: {
	data: {
	    linkCount: 0,
	    maxLinkCount: 8,
	    networks: null,
	    allowNumberEdit: true,
	    infoText: '',
	},
	formulas: {
	    addDisabled: function(get) {
		return !get('allowNumberEdit') ||
		    get('linkCount') >= get('maxLinkCount');
	    },
	    dockHidden: function(get) {
		return !(get('allowNumberEdit') || get('infoText'));
	    },
	},
    },

    dockedItems: [{
	xtype: 'toolbar',
	dock: 'bottom',
	defaultButtonUI: 'default',
	border: false,
	padding: '6 0 6 0',
	bind: {
	    hidden: '{dockHidden}',
	},
	items: [
	    {
		xtype: 'button',
		text: gettext('Add'),
		bind: {
		    disabled: '{addDisabled}',
		    hidden: '{!allowNumberEdit}',
		},
		handler: 'addEmptyLink',
	    },
	    {
		xtype: 'label',
		bind: {
		    text: '{infoText}',
		},
	    },
	],
    }],

    setInfoText: function(text) {
	let me = this;
	let vm = me.getViewModel();

	vm.set('infoText', text || '');
    },

    setLinks: function(links) {
	let me = this;
	let controller = me.getController();
	let vm = me.getViewModel();

	me.removeAll();
	vm.set('linkCount', 0);

	Ext.Array.each(links, link => controller.addLink(link));
    },

    setDefaultLinks: function() {
	let me = this;
	let controller = me.getController();
	let vm = me.getViewModel();

	me.removeAll();
	vm.set('linkCount', 0);
	controller.addLink();
    },

    // clears all links
    setAllowNumberEdit: function(allow) {
	let me = this;
	let vm = me.getViewModel();
	vm.set('allowNumberEdit', allow);
	me.removeAll();
	vm.set('linkCount', 0);
    },

    items: [{
	// No links is never a valid scenario, but can occur during a slow load
	xtype: 'hiddenfield',
	submitValue: false,
	isValid: function() {
	    let me = this;
	    let vm = me.up('pveCorosyncLinkEditor').getViewModel();
	    return vm.get('linkCount') > 0;
	},
    }],

    initComponent: function() {
	let me = this;
	let vm = me.getViewModel();
	let controller = me.getController();

	vm.set('allowNumberEdit', me.allowNumberEdit);
	vm.set('infoText', me.infoText || '');

	me.callParent();

	// Request local node networks to pre-populate first link.
	Proxmox.Utils.API2Request({
	    url: '/nodes/localhost/network',
	    method: 'GET',
	    waitMsgTarget: me,
	    success: response => {
		let data = response.result.data;
		if (data.length > 0) {
		    data.sort((a, b) => a.iface.localeCompare(b.iface));
		    let addresses = [];
		    for (let net of data) {
			if (net.address) {
			    addresses.push(net.address);
			}
			if (net.address6) {
			    addresses.push(net.address6);
			}
		    }

		    vm.set('networks', addresses);
		}

		// Always have at least one link, but account for delay in API,
		// someone might have called 'setLinks' in the meantime -
		// except if 'allowNumberEdit' is false, in which case we're
		// probably waiting for the user to input the join info
		if (vm.get('allowNumberEdit')) {
		    controller.addLinkIfEmpty();
		}
	    },
	    failure: () => {
		if (vm.get('allowNumberEdit')) {
		    controller.addLinkIfEmpty();
		}
	    },
	});
    },
});