import {FormatType} from '../modeling';

export type ReturnType =
	'objects'
	| 'relations'
	| 'pairs'
	| 'map'
	| 'keyed_objects'
	| 'keyed_relations'
	| 'keyed_pairs';
export type ValueType = 'primitive' | 'list' | 'summary';
export type ObjectType = 'specials' | 'instance';

export type DataValue = string | number | boolean | ArrayBuffer;
export type JSONDataValue = string | number | boolean;
export type JSONValue =
	| string
	| number
	| boolean
	| null
	| { [x: string]: JSONValue }
	| Array<JSONValue>;

export type Parameters = { [_: string]: JSONValue };

export class Mapping {

	protected _valueType: ValueType;
	protected _valueParams: { [_: string]: JSONValue };

	public constructor(valueType: ValueType) {
		this._valueType = valueType;
		this._valueParams = {};
	}

	public get valueType(): ValueType {
		return this._valueType;
	}

	public get parameters(): Parameters {
		return this._valueParams;
	}

	public change(change: 'set' | 'add'): Mapping {
		this.set('change', change);
		return this;
	}

	protected set(key: string, value: JSONValue): Mapping {
		this._valueParams[key] = value;
		return this;
	}

	public setParams(params: { [_: string]: JSONValue }) {
		params['mapping'] = this._valueType
		for (const k in this._valueParams) {
			params[`mp_${k}`] = this._valueParams[k]
		}
	}
}

export class PrimitiveMapping extends Mapping {

	constructor() {
		super('primitive');
	}

	public change(change: 'set' | 'add'): PrimitiveMapping {
		return super.change(change);
	}

}

export class ListMapping extends Mapping {

	constructor() {
		super('list');
	}

	public change(change: 'set' | 'add'): ListMapping {
		return super.change(change);
	}

}

export class KeyedListMapping extends Mapping {

	constructor(format: FormatType) {
		super('list');
		this.set('keyFormat', format);
	}

	public change(change: 'set' | 'add'): KeyedListMapping {
		return super.change(change);
	}

}

export class SystemError {

	public constructor(public readonly code: number, public readonly message: string) {
	}

}