import { ConfigArg } from '@subit/common/lib/generated-types';
import { RequestContext } from '../../api/common/request-context';
import { ConfigArgs, ConfigArgValues, ConfigurableOperationDef, ConfigurableOperationDefOptions } from '../../common/configurable-operation';
import { PromotionState } from '../../entity';
import { OrderItem } from '../../entity/order-item/order-item.entity';
import { OrderLine } from '../../entity/order-line/order-line.entity';
import { Order } from '../../entity/order/order.entity';
import { ShippingLine } from '../../entity/shipping-line/shipping-line.entity';
import { PromotionCondition } from './promotion-condition';
/**
 * Unwrap a promise type
 */
declare type Awaited<T> = T extends PromiseLike<infer U> ? Awaited<U> : T;
/**
 * Extract the (non-false) return value of the PromotionCondition "check" function.
 */
declare type ConditionCheckReturnType<T extends PromotionCondition<any>> = Exclude<Awaited<ReturnType<T['check']>>, false>;
/**
 * Converts an array of PromotionCondition types into a tuple, thus preserving the
 * distinct type of each condition in the array.
 */
export declare type ConditionTuple<C extends Array<PromotionCondition<any>>> = [...C];
/**
 * Converts an array of PromotionConditions into a tuple of the type:
 * [<condition code>, <check function return value>]
 */
declare type CodesStateTuple<T extends ConditionTuple<Array<PromotionCondition<any>>>> = {
    [K in keyof T]: T[K] extends PromotionCondition<any> ? [T[K]['code'], ConditionCheckReturnType<T[K]>] : never;
};
/**
 * Convert a tuple into a union
 * [[string, number], [number, boolean]] => [string, number] | [number, boolean]
 */
declare type TupleToUnion<T extends any[]> = T[number];
/**
 * Converts an array of PromotionConditions into an object of the type:
 * {
 *     [PromotionCondition.code]: ReturnType<PromotionCondition.check()>
 * }
 */
export declare type ConditionState<U extends Array<PromotionCondition<any>>, T extends [string, any] = TupleToUnion<CodesStateTuple<ConditionTuple<U>>>> = {
    [key in T[0]]: Extract<T, [key, any]>[1];
};
/**
 * @description
 * The function which is used by a PromotionItemAction to calculate the
 * discount on the OrderItem.
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 */
export declare type ExecutePromotionItemActionFn<T extends ConfigArgs, U extends Array<PromotionCondition<any>>> = (ctx: RequestContext, orderItem: OrderItem, orderLine: OrderLine, args: ConfigArgValues<T>, state: ConditionState<U>) => number | Promise<number>;
/**
 * @description
 * The function which is used by a PromotionOrderAction to calculate the
 * discount on the Order.
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 */
export declare type ExecutePromotionOrderActionFn<T extends ConfigArgs, U extends Array<PromotionCondition<any>>> = (ctx: RequestContext, order: Order, args: ConfigArgValues<T>, state: ConditionState<U>) => number | Promise<number>;
/**
 * @description
 * The function which is used by a PromotionOrderAction to calculate the
 * discount on the Order.
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 */
export declare type ExecutePromotionShippingActionFn<T extends ConfigArgs, U extends Array<PromotionCondition<any>>> = (ctx: RequestContext, shippingLine: ShippingLine, order: Order, args: ConfigArgValues<T>, state: ConditionState<U>) => number | Promise<number>;
/**
 * @description
 * Configuration for all types of {@link PromotionAction}.
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 */
export interface PromotionActionConfig<T extends ConfigArgs, U extends Array<PromotionCondition<any>> | undefined> extends ConfigurableOperationDefOptions<T> {
    /**
     * @description
     * Used to determine the order of application of multiple Promotions
     * on the same Order. See the {@link Promotion} `priorityScore` field for
     * more information.
     *
     * @default 0
     */
    priorityValue?: number;
    /**
     * @description
     * Allows PromotionActions to define one or more PromotionConditions as dependencies. Having a PromotionCondition
     * as a dependency has the following consequences:
     * 1. A Promotion using this PromotionAction is only valid if it also contains all PromotionConditions
     * on which it depends.
     * 2. The `execute()` function will receive a statically-typed `state` argument which will contain
     * the return values of the PromotionConditions' `check()` function.
     */
    conditions?: U extends undefined ? undefined : ConditionTuple<Exclude<U, undefined>>;
}
/**
 * @description
 * Configuration for a {@link PromotionItemAction}
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 */
export interface PromotionItemActionConfig<T extends ConfigArgs, U extends PromotionCondition[]> extends PromotionActionConfig<T, U> {
    /**
     * @description
     * The function which contains the promotion calculation logic.
     */
    execute: ExecutePromotionItemActionFn<T, U>;
}
/**
 * @description
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 */
export interface PromotionOrderActionConfig<T extends ConfigArgs, U extends PromotionCondition[]> extends PromotionActionConfig<T, U> {
    /**
     * @description
     * The function which contains the promotion calculation logic.
     */
    execute: ExecutePromotionOrderActionFn<T, U>;
}
/**
 * @description
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 */
export interface PromotionShippingActionConfig<T extends ConfigArgs, U extends PromotionCondition[]> extends PromotionActionConfig<T, U> {
    /**
     * @description
     * The function which contains the promotion calculation logic.
     */
    execute: ExecutePromotionShippingActionFn<T, U>;
}
/**
 * @description
 * An abstract class which is extended by {@link PromotionItemAction}, {@link PromotionOrderAction},
 * and {@link PromotionShippingAction}.
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 * @docsWeight 0
 */
export declare abstract class PromotionAction<T extends ConfigArgs = {}, U extends PromotionCondition[] | undefined = any> extends ConfigurableOperationDef<T> {
    /**
     * @description
     * Used to determine the order of application of multiple Promotions
     * on the same Order. See the {@link Promotion} `priorityScore` field for
     * more information.
     *
     * @default 0
     */
    readonly priorityValue: number;
    readonly conditions?: U;
    protected constructor(config: PromotionActionConfig<T, U>);
}
/**
 * @description
 * Represents a PromotionAction which applies to individual {@link OrderItem}s.
 *
 * @example
 * ```ts
 * // Applies a percentage discount to each OrderItem
 * const itemPercentageDiscount = new PromotionItemAction({
 *     code: 'item_percentage_discount',
 *     args: { discount: 'percentage' },
 *     execute(ctx, orderItem, orderLine, args) {
 *         return -orderLine.unitPrice * (args.discount / 100);
 *     },
 *     description: 'Discount every item by { discount }%',
 * });
 * ```
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 * @docsWeight 1
 */
export declare class PromotionItemAction<T extends ConfigArgs = ConfigArgs, U extends Array<PromotionCondition<any>> = []> extends PromotionAction<T, U> {
    private readonly executeFn;
    constructor(config: PromotionItemActionConfig<T, U>);
    /** @internal */
    execute(ctx: RequestContext, orderItem: OrderItem, orderLine: OrderLine, args: ConfigArg[], state: PromotionState): number | Promise<number>;
}
/**
 * @description
 * Represents a PromotionAction which applies to the {@link Order} as a whole.
 *
 * @example
 * ```ts
 * // Applies a percentage discount to the entire Order
 * const orderPercentageDiscount = new PromotionOrderAction({
 *     code: 'order_percentage_discount',
 *     args: { discount: 'percentage' },
 *     execute(ctx, order, args) {
 *         return -order.subTotal * (args.discount / 100);
 *     },
 *     description: 'Discount order by { discount }%',
 * });
 * ```
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 * @docsWeight 2
 */
export declare class PromotionOrderAction<T extends ConfigArgs = ConfigArgs, U extends PromotionCondition[] = []> extends PromotionAction<T, U> {
    private readonly executeFn;
    constructor(config: PromotionOrderActionConfig<T, U>);
    /** @internal */
    execute(ctx: RequestContext, order: Order, args: ConfigArg[], state: PromotionState): number | Promise<number>;
}
/**
 * @description
 * Represents a PromotionAction which applies to the shipping cost of an Order.
 *
 * @docsCategory promotions
 * @docsPage promotion-action
 * @docsWeight 3
 */
export declare class PromotionShippingAction<T extends ConfigArgs = ConfigArgs, U extends PromotionCondition[] = []> extends PromotionAction<T, U> {
    private readonly executeFn;
    constructor(config: PromotionShippingActionConfig<T, U>);
    /** @internal */
    execute(ctx: RequestContext, shippingLine: ShippingLine, order: Order, args: ConfigArg[], state: PromotionState): number | Promise<number>;
}
export {};