/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the Source EULA. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import * as azdata from 'azdata';
import { ModelViewBase } from '../modelViewBase';
import { ApiWrapper } from '../../../common/apiWrapper';
import * as constants from '../../../common/constants';
import { IPageView, IDataComponent } from '../../interfaces';
import { TableSelectionComponent } from '../tableSelectionComponent';
import { DatabaseTable } from '../../../prediction/interfaces';

/**
 * View to pick model source
 */
export class ModelImportLocationPage extends ModelViewBase implements IPageView, IDataComponent<DatabaseTable> {

	private _form: azdata.FormContainer | undefined;
	private _formBuilder: azdata.FormBuilder | undefined;
	public tableSelectionComponent: TableSelectionComponent | undefined;
	private _labelComponent: azdata.TextComponent | undefined;
	private _descriptionComponent: azdata.TextComponent | undefined;
	private _labelContainer: azdata.FlexContainer | undefined;


	constructor(apiWrapper: ApiWrapper, parent: ModelViewBase) {
		super(apiWrapper, parent.root, parent);
	}

	/**
	 *
	 * @param modelBuilder Register components
	 */
	public registerComponent(modelBuilder: azdata.ModelBuilder): azdata.Component {

		this._formBuilder = modelBuilder.formContainer();
		this.tableSelectionComponent = new TableSelectionComponent(this._apiWrapper, this, { editable: true, preSelected: true });
		this._descriptionComponent = modelBuilder.text().withProperties({
			width: 200
		}).component();
		this._labelComponent = modelBuilder.text().withProperties({
			width: 200
		}).component();
		this._labelContainer = modelBuilder.flexContainer().withLayout({
			flexFlow: 'column',
			width: 800,
			height: '300px',
			justifyContent: 'center'
		}).component();

		this._labelContainer.addItem(
			this._labelComponent
			, {
				CSSStyles: {
					'align-items': 'center',
					'padding-top': '10px',
					'padding-left': `${this.componentMaxLength}px`,
					'font-size': '16px'
				}
			});
		this._labelContainer.addItem(
			this._descriptionComponent
			, {
				CSSStyles: {
					'align-items': 'center',
					'padding-top': '10px',
					'padding-left': `${this.componentMaxLength - 80}px`,
					'font-size': '13px'
				}
			});


		this.tableSelectionComponent.onSelectedChanged(async () => {
			await this.onTableSelected();
		});
		this.tableSelectionComponent.registerComponent(modelBuilder, constants.databaseName, constants.tableName);
		this.tableSelectionComponent.addComponents(this._formBuilder);

		this._formBuilder.addFormItem({
			title: '',
			component: this._labelContainer
		});
		this._form = this._formBuilder.component();
		return this._form;
	}

	private async onTableSelected(): Promise<void> {
		if (this.tableSelectionComponent?.data) {
			this.importTable = this.tableSelectionComponent?.data;
		}

		if (this.importTable && this._labelComponent) {
			if (!this.validateImportTableName()) {
				this._labelComponent.value = constants.selectModelsTableMessage;
			} else {
				const validated = await this.verifyImportConfigTable(this.importTable);
				if (validated) {
					this._labelComponent.value = constants.modelSchemaIsAcceptedMessage;
				} else {
					this._labelComponent.value = constants.modelSchemaIsNotAcceptedMessage;
				}
			}
		}
	}

	private validateImportTableName(): boolean {
		return this.importTable?.databaseName !== undefined && this.importTable?.databaseName !== constants.selectDatabaseTitle
			&& this.importTable?.tableName !== undefined && this.importTable?.tableName !== constants.selectTableTitle;
	}

	/**
	 * Returns selected data
	 */
	public get data(): DatabaseTable | undefined {
		return this.tableSelectionComponent?.data;
	}

	/**
	 * Returns the component
	 */
	public get component(): azdata.Component | undefined {
		return this._form;
	}

	/**
	 * Refreshes the view
	 */
	public async refresh(): Promise<void> {
		if (this.tableSelectionComponent) {
			await this.tableSelectionComponent.refresh();
		}
	}

	/**
	 * Returns page title
	 */
	public get title(): string {
		return constants.modelImportTargetPageTitle;
	}

	public async disposePage(): Promise<void> {
	}

	public async validate(): Promise<boolean> {
		let validated = false;

		if (this.data && this.validateImportTableName()) {
			validated = true;
			validated = await this.verifyImportConfigTable(this.data);
			if (!validated) {
				this.showErrorMessage(constants.invalidImportTableSchemaError(this.data?.databaseName, this.data?.tableName));
			}
		} else {
			this.showErrorMessage(constants.invalidImportTableError(this.data?.databaseName, this.data?.tableName));
		}
		return validated;
	}
}