/**
 * This mirrors action definitions from sandbox/grist/actions.py
 */

import map = require('lodash/map');

export type AddRecord = ['AddRecord', string, number, ColValues];
export type BulkAddRecord = ['BulkAddRecord', string, number[], BulkColValues];
export type RemoveRecord = ['RemoveRecord', string, number];
export type BulkRemoveRecord = ['BulkRemoveRecord', string, number[]];
export type UpdateRecord = ['UpdateRecord', string, number, ColValues];
export type BulkUpdateRecord = ['BulkUpdateRecord', string, number[], BulkColValues];

export type ReplaceTableData = ['ReplaceTableData', string, number[], BulkColValues];

// This is the format in which data comes when we fetch a table from the sandbox.
export type TableDataAction = ['TableData', string, number[], BulkColValues];

export type AddColumn = ['AddColumn', string, string, ColInfo];
export type RemoveColumn = ['RemoveColumn', string, string];
export type RenameColumn = ['RenameColumn', string, string, string];
export type ModifyColumn = ['ModifyColumn', string, string, ColInfo];

export type AddTable = ['AddTable', string, ColInfoWithId[]];
export type RemoveTable = ['RemoveTable', string];
export type RenameTable = ['RenameTable', string, string];

export type DocAction = (
  AddRecord |
  BulkAddRecord |
  RemoveRecord |
  BulkRemoveRecord |
  UpdateRecord |
  BulkUpdateRecord |
  ReplaceTableData |
  TableDataAction |
  AddColumn |
  RemoveColumn |
  RenameColumn |
  ModifyColumn |
  AddTable |
  RemoveTable |
  RenameTable
);

// type guards for convenience - see:
//   https://www.typescriptlang.org/docs/handbook/advanced-types.html#user-defined-type-guards
export function isAddRecord(act: DocAction): act is AddRecord { return act[0] === 'AddRecord'; }
export function isBulkAddRecord(act: DocAction): act is BulkAddRecord { return act[0] === 'BulkAddRecord'; }
export function isRemoveRecord(act: DocAction): act is RemoveRecord { return act[0] === 'RemoveRecord'; }
export function isBulkRemoveRecord(act: DocAction): act is BulkRemoveRecord { return act[0] === 'BulkRemoveRecord'; }
export function isUpdateRecord(act: DocAction): act is UpdateRecord { return act[0] === 'UpdateRecord'; }
export function isBulkUpdateRecord(act: DocAction): act is BulkUpdateRecord { return act[0] === 'BulkUpdateRecord'; }

export function isReplaceTableData(act: DocAction): act is ReplaceTableData { return act[0] === 'ReplaceTableData'; }

export function isAddColumn(act: DocAction): act is AddColumn { return act[0] === 'AddColumn'; }
export function isRemoveColumn(act: DocAction): act is RemoveColumn { return act[0] === 'RemoveColumn'; }
export function isRenameColumn(act: DocAction): act is RenameColumn { return act[0] === 'RenameColumn'; }
export function isModifyColumn(act: DocAction): act is ModifyColumn { return act[0] === 'ModifyColumn'; }

export function isAddTable(act: DocAction): act is AddTable { return act[0] === 'AddTable'; }
export function isRemoveTable(act: DocAction): act is RemoveTable { return act[0] === 'RemoveTable'; }
export function isRenameTable(act: DocAction): act is RenameTable { return act[0] === 'RenameTable'; }


const SCHEMA_ACTIONS = new Set(['AddTable', 'RemoveTable', 'RenameTable', 'AddColumn',
  'RemoveColumn', 'RenameColumn', 'ModifyColumn']);

/**
 * Determines whether a given action is a schema action or not.
 */
export function isSchemaAction(action: DocAction): boolean {
  return SCHEMA_ACTIONS.has(action[0]);
}

/**
 * Returns the tableId from the action.
 */
export function getTableId(action: DocAction): string {
  return action[1];   // It happens to always be in the same position in the action tuple.
}

// Helper types used in the definitions above.

export type CellValue = number|string|boolean|null|[string, any?];
export interface ColValues { [colId: string]: CellValue; }
export interface BulkColValues { [colId: string]: CellValue[]; }
export interface ColInfoMap { [colId: string]: ColInfo; }

export interface ColInfo {
  type: string;
  isFormula: boolean;
  formula: string;
}

export interface ColInfoWithId extends ColInfo {
  id: string;
}

export interface RowRecord {
  id: number;
  [colId: string]: CellValue;
}

// Multiple records in column-oriented format, i.e. same as BulkColValues but with a mandatory
// 'id' column. This is preferred over TableDataAction in external APIs.
export interface TableColValues {
  id: number[];
  [colId: string]: CellValue[];
}

// Both UserActions and DocActions are represented as [ActionName, ...actionArgs].
// TODO I think it's better to represent DocAction as a Buffer containing the marshalled action.

export type UserAction = Array<string|number|object|boolean|null|undefined>;

/**
 * Gives a description for an action which involves setting values to a selection.
 * @param {Array} action - The (Bulk)AddRecord/(Bulk)UpdateRecord action to describe.
 * @param {Boolean} optExcludeVals - Indicates whether the values should be excluded from
 *  the description.
 */
export function getSelectionDesc(action: UserAction, optExcludeVals: boolean): string {
  const table   = action[1];
  const rows    = action[2];
  const colValues: number[]  = action[3] as any;  // TODO: better typing - but code may evaporate
  const columns = map(colValues, (values, col) => optExcludeVals ? col : `${col}: ${values}`);
  const s = typeof rows === 'object' ? 's' : '';
  return `table ${table}, row${s} ${rows}; ${columns.join(", ")}`;
}

// Convert from TableColValues (used by DocStorage and external APIs) to TableDataAction (used
// mainly by the sandbox).
export function toTableDataAction(tableId: string, colValues: TableColValues): TableDataAction {
  const colData = {...colValues};   // Make a copy to avoid changing passed-in arguments.
  const rowIds: number[] = colData.id;
  delete colData.id;
  return ['TableData', tableId, rowIds, colData];
}

// Convert from TableDataAction (used mainly by the sandbox) to TableColValues (used by DocStorage
// and external APIs).
export function fromTableDataAction(tableData: TableDataAction): TableColValues {
  const rowIds: number[] = tableData[2];
  const colValues: BulkColValues = tableData[3];
  return {id: rowIds, ...colValues};
}