import { normalizeBool, isType, isBlank, isFunction, stringify } from 'angular2/src/facade/lang';
import { BaseException } from 'angular2/src/facade/exceptions';
/**
 * Describes how the {@link Injector} should instantiate a given token.
 *
 * See {@link provide}.
 *
 * ### Example ([live demo](http://plnkr.co/edit/GNAyj6K6PfYg2NBzgwZ5?p%3Dpreview&p=preview))
 *
 * ```javascript
 * var injector = Injector.resolveAndCreate([
 *   new Provider("message", { useValue: 'Hello' })
 * ]);
 *
 * expect(injector.get("message")).toEqual('Hello');
 * ```
 * @ts2dart_const
 */
export class Provider {
    constructor(token, { useClass, useValue, useExisting, useFactory, deps, multi }) {
        this.token = token;
        this.useClass = useClass;
        this.useValue = useValue;
        this.useExisting = useExisting;
        this.useFactory = useFactory;
        this.dependencies = deps;
        this._multi = multi;
    }
    // TODO: Provide a full working example after alpha38 is released.
    /**
     * Creates multiple providers matching the same token (a multi-provider).
     *
     * Multi-providers are used for creating pluggable service, where the system comes
     * with some default providers, and the user can register additional providers.
     * The combination of the default providers and the additional providers will be
     * used to drive the behavior of the system.
     *
     * ### Example
     *
     * ```typescript
     * var injector = Injector.resolveAndCreate([
     *   new Provider("Strings", { useValue: "String1", multi: true}),
     *   new Provider("Strings", { useValue: "String2", multi: true})
     * ]);
     *
     * expect(injector.get("Strings")).toEqual(["String1", "String2"]);
     * ```
     *
     * Multi-providers and regular providers cannot be mixed. The following
     * will throw an exception:
     *
     * ```typescript
     * var injector = Injector.resolveAndCreate([
     *   new Provider("Strings", { useValue: "String1", multi: true }),
     *   new Provider("Strings", { useValue: "String2"})
     * ]);
     * ```
     */
    get multi() { return normalizeBool(this._multi); }
}
/**
 * See {@link Provider} instead.
 *
 * @deprecated
 * @ts2dart_const
 */
export class Binding extends Provider {
    constructor(token, { toClass, toValue, toAlias, toFactory, deps, multi }) {
        super(token, {
            useClass: toClass,
            useValue: toValue,
            useExisting: toAlias,
            useFactory: toFactory,
            deps: deps,
            multi: multi
        });
    }
    /**
     * @deprecated
     */
    get toClass() { return this.useClass; }
    /**
     * @deprecated
     */
    get toAlias() { return this.useExisting; }
    /**
     * @deprecated
     */
    get toFactory() { return this.useFactory; }
    /**
     * @deprecated
     */
    get toValue() { return this.useValue; }
}
/**
 * Creates a {@link Provider}.
 *
 * To construct a {@link Provider}, bind a `token` to either a class, a value, a factory function,
 * or
 * to an existing `token`.
 * See {@link ProviderBuilder} for more details.
 *
 * The `token` is most commonly a class or {@link OpaqueToken-class.html}.
 *
 * @deprecated
 */
export function bind(token) {
    return new ProviderBuilder(token);
}
/**
 * Helper class for the {@link bind} function.
 */
export class ProviderBuilder {
    constructor(token) {
        this.token = token;
    }
    /**
     * Binds a DI token to a class.
     *
     * ### Example ([live demo](http://plnkr.co/edit/ZpBCSYqv6e2ud5KXLdxQ?p=preview))
     *
     * Because `toAlias` and `toClass` are often confused, the example contains
     * both use cases for easy comparison.
     *
     * ```typescript
     * class Vehicle {}
     *
     * class Car extends Vehicle {}
     *
     * var injectorClass = Injector.resolveAndCreate([
     *   Car,
     *   provide(Vehicle, {useClass: Car})
     * ]);
     * var injectorAlias = Injector.resolveAndCreate([
     *   Car,
     *   provide(Vehicle, {useExisting: Car})
     * ]);
     *
     * expect(injectorClass.get(Vehicle)).not.toBe(injectorClass.get(Car));
     * expect(injectorClass.get(Vehicle) instanceof Car).toBe(true);
     *
     * expect(injectorAlias.get(Vehicle)).toBe(injectorAlias.get(Car));
     * expect(injectorAlias.get(Vehicle) instanceof Car).toBe(true);
     * ```
     */
    toClass(type) {
        if (!isType(type)) {
            throw new BaseException(`Trying to create a class provider but "${stringify(type)}" is not a class!`);
        }
        return new Provider(this.token, { useClass: type });
    }
    /**
     * Binds a DI token to a value.
     *
     * ### Example ([live demo](http://plnkr.co/edit/G024PFHmDL0cJFgfZK8O?p=preview))
     *
     * ```typescript
     * var injector = Injector.resolveAndCreate([
     *   provide('message', {useValue: 'Hello'})
     * ]);
     *
     * expect(injector.get('message')).toEqual('Hello');
     * ```
     */
    toValue(value) { return new Provider(this.token, { useValue: value }); }
    /**
     * Binds a DI token to an existing token.
     *
     * Angular will return the same instance as if the provided token was used. (This is
     * in contrast to `useClass` where a separate instance of `useClass` will be returned.)
     *
     * ### Example ([live demo](http://plnkr.co/edit/uBaoF2pN5cfc5AfZapNw?p=preview))
     *
     * Because `toAlias` and `toClass` are often confused, the example contains
     * both use cases for easy comparison.
     *
     * ```typescript
     * class Vehicle {}
     *
     * class Car extends Vehicle {}
     *
     * var injectorAlias = Injector.resolveAndCreate([
     *   Car,
     *   provide(Vehicle, {useExisting: Car})
     * ]);
     * var injectorClass = Injector.resolveAndCreate([
     *   Car,
     *   provide(Vehicle, {useClass: Car})
     * ]);
     *
     * expect(injectorAlias.get(Vehicle)).toBe(injectorAlias.get(Car));
     * expect(injectorAlias.get(Vehicle) instanceof Car).toBe(true);
     *
     * expect(injectorClass.get(Vehicle)).not.toBe(injectorClass.get(Car));
     * expect(injectorClass.get(Vehicle) instanceof Car).toBe(true);
     * ```
     */
    toAlias(aliasToken) {
        if (isBlank(aliasToken)) {
            throw new BaseException(`Can not alias ${stringify(this.token)} to a blank value!`);
        }
        return new Provider(this.token, { useExisting: aliasToken });
    }
    /**
     * Binds a DI token to a function which computes the value.
     *
     * ### Example ([live demo](http://plnkr.co/edit/OejNIfTT3zb1iBxaIYOb?p=preview))
     *
     * ```typescript
     * var injector = Injector.resolveAndCreate([
     *   provide(Number, {useFactory: () => { return 1+2; }}),
     *   provide(String, {useFactory: (v) => { return "Value: " + v; }, deps: [Number]})
     * ]);
     *
     * expect(injector.get(Number)).toEqual(3);
     * expect(injector.get(String)).toEqual('Value: 3');
     * ```
     */
    toFactory(factory, dependencies) {
        if (!isFunction(factory)) {
            throw new BaseException(`Trying to create a factory provider but "${stringify(factory)}" is not a function!`);
        }
        return new Provider(this.token, { useFactory: factory, deps: dependencies });
    }
}
/**
 * Creates a {@link Provider}.
 *
 * See {@link Provider} for more details.
 *
 * <!-- TODO: improve the docs -->
 */
export function provide(token, { useClass, useValue, useExisting, useFactory, deps, multi }) {
    return new Provider(token, {
        useClass: useClass,
        useValue: useValue,
        useExisting: useExisting,
        useFactory: useFactory,
        deps: deps,
        multi: multi
    });
}
