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

import { nb } from 'sqlops';

import { Action } from 'vs/base/common/actions';
import { TPromise } from 'vs/base/common/winjs.base';
import { localize } from 'vs/nls';
import { CellType } from 'sql/parts/notebook/models/contracts';
import { NotebookModel } from 'sql/parts/notebook/models/notebookModel';
import { getErrorMessage } from 'sql/parts/notebook/notebookUtils';
import { INotificationService, Severity } from 'vs/platform/notification/common/notification';
import { ICellModel, FutureInternal } from 'sql/parts/notebook/models/modelInterfaces';
import { ToggleableAction } from 'sql/parts/notebook/notebookActions';

let notebookMoreActionMsg = localize('notebook.failed', "Please select active cell and try again");

function hasModelAndCell(context: CellContext, notificationService: INotificationService): boolean  {
	if (!context || !context.model) {
		return false;
	}
	if (context.cell === undefined) {
		notificationService.notify({
			severity: Severity.Error,
			message: notebookMoreActionMsg
		});
		return false;
	}
	return true;
}

export class CellContext {
	constructor(public model: NotebookModel, private _cell?: ICellModel) {
	}

	public get cell(): ICellModel {
		return this._cell ? this._cell : this.model.activeCell;
	}
}

abstract class CellActionBase extends Action {

	constructor(id: string, label: string, icon: string, protected notificationService: INotificationService) {
		super(id, label, icon);
	}

	public run(context: CellContext): TPromise<boolean> {
		if (hasModelAndCell(context, this.notificationService)) {
			return TPromise.wrap(this.runCellAction(context).then(() => true));
		}
		return TPromise.as(true);
	}

	abstract runCellAction(context: CellContext): Promise<void>;
}

export class RunCellAction extends ToggleableAction {
	public static ID = 'notebook.runCell';
	public static LABEL = 'Run cell';

	constructor(@INotificationService private notificationService: INotificationService) {
		super(RunCellAction.ID, {
			shouldToggleTooltip: true,
			toggleOnLabel: localize('runCell', 'Run cell'),
			toggleOnClass: 'toolbarIconRun',
			toggleOffLabel: localize('stopCell', 'Cancel execution'),
			toggleOffClass: 'toolbarIconStop',
			isOn: true
		});
	}

	public run(context: CellContext): TPromise<boolean> {
		if (hasModelAndCell(context, this.notificationService)) {
			return TPromise.wrap(this.runCellAction(context).then(() => true));
		}
		return TPromise.as(true);
	}

	public async runCellAction(context: CellContext): Promise<void> {
        try {
			let model = context.model;
			let cell = context.cell;
            let kernel = await this.getOrStartKernel(model);
            if (!kernel) {
                return;
			}
            // If cell is currently running and user clicks the stop/cancel button, call kernel.interrupt()
            // This matches the same behavior as JupyterLab
            if (cell.future && cell.future.inProgress) {
                cell.future.inProgress = false;
                await kernel.interrupt();
            } else {
                // TODO update source based on editor component contents
                let content = cell.source;
                if (content) {
                    this.toggle(false);
                    let future = await kernel.requestExecute({
                        code: content,
                        stop_on_error: true
                    }, false);
                    cell.setFuture(future as FutureInternal);
                    // For now, await future completion. Later we should just track and handle cancellation based on model notifications
                    let reply = await future.done;
                }
            }
        } catch (error) {
            let message = getErrorMessage(error);
            this.notificationService.error(message);
        } finally {
            this.toggle(true);
		}
    }

    private async getOrStartKernel(model: NotebookModel): Promise<nb.IKernel> {
        let clientSession = model && model.clientSession;
        if (!clientSession) {
            this.notificationService.error(localize('notebookNotReady', 'The session for this notebook is not yet ready'));
            return undefined;
        } else if (!clientSession.isReady || clientSession.status === 'dead') {
            this.notificationService.info(localize('sessionNotReady', 'The session for this notebook will start momentarily'));
            await clientSession.kernelChangeCompleted;
        }
        if (!clientSession.kernel) {
            let defaultKernel = model && model.defaultKernel && model.defaultKernel.name;
            if (!defaultKernel) {
                this.notificationService.error(localize('noDefaultKernel', 'No kernel is available for this notebook'));
                return undefined;
            }
            await clientSession.changeKernel({
                name: defaultKernel
            });
        }
        return clientSession.kernel;
    }
}

export class AddCellAction extends CellActionBase {
	constructor(
		id: string, label: string, private cellType: CellType, private isAfter: boolean,
		@INotificationService notificationService: INotificationService
	) {
		super(id, label, undefined, notificationService);
	}

	runCellAction(context: CellContext): Promise<void> {
		try {
			let model = context.model;
			let index = model.cells.findIndex((cell) => cell.id === context.cell.id);
			if (index !== undefined && this.isAfter) {
				index += 1;
			}
			model.addCell(this.cellType, index);
		} catch (error) {
			let message = getErrorMessage(error);

			this.notificationService.notify({
				severity: Severity.Error,
				message: message
			});
		}
		return Promise.resolve();
	}
}

export class DeleteCellAction extends CellActionBase {
	constructor(id: string, label: string,
		@INotificationService notificationService: INotificationService
	) {
		super(id, label, undefined, notificationService);
	}

	runCellAction(context: CellContext): Promise<void> {
		try {
				context.model.deleteCell(context.cell);
		} catch (error) {
			let message = getErrorMessage(error);

			this.notificationService.notify({
				severity: Severity.Error,
				message: message
			});
		}
		return Promise.resolve();
	}
}