"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.softMixProtos = exports.proxyMix = exports.getIngredientWithProp = void 0;
const util_1 = require("./util");
/**
 * Finds the ingredient with the given prop, searching in reverse order and breadth-first if searching ingredient
 * prototypes is required.
 */
const getIngredientWithProp = (prop, ingredients) => {
    const protoChains = ingredients.map(ingredient => util_1.protoChain(ingredient));
    // since we search breadth-first, we need to keep track of our depth in the prototype chains
    let protoDepth = 0;
    // not all prototype chains are the same depth, so this remains true as long as at least one of the ingredients'
    // prototype chains has an object at this depth
    let protosAreLeftToSearch = true;
    while (protosAreLeftToSearch) {
        // with the start of each horizontal slice, we assume this is the one that's deeper than any of the proto chains
        protosAreLeftToSearch = false;
        // scan through the ingredients right to left
        for (let i = ingredients.length - 1; i >= 0; i--) {
            const searchTarget = protoChains[i][protoDepth];
            if (searchTarget !== undefined && searchTarget !== null) {
                // if we find something, this is proof that this horizontal slice potentially more objects to search
                protosAreLeftToSearch = true;
                // eureka, we found it
                if (Object.getOwnPropertyDescriptor(searchTarget, prop) != undefined) {
                    return protoChains[i][0];
                }
            }
        }
        protoDepth++;
    }
    return undefined;
};
exports.getIngredientWithProp = getIngredientWithProp;
/**
 * "Mixes" ingredients by wrapping them in a Proxy.  The optional prototype argument allows the mixed object to sit
 * downstream of an existing prototype chain.  Note that "properties" cannot be added, deleted, or modified.
 */
const proxyMix = (ingredients, prototype = Object.prototype) => new Proxy({}, {
    getPrototypeOf() {
        return prototype;
    },
    setPrototypeOf() {
        throw Error('Cannot set prototype of Proxies created by ts-mixer');
    },
    getOwnPropertyDescriptor(_, prop) {
        return Object.getOwnPropertyDescriptor(exports.getIngredientWithProp(prop, ingredients) || {}, prop);
    },
    defineProperty() {
        throw new Error('Cannot define new properties on Proxies created by ts-mixer');
    },
    has(_, prop) {
        return exports.getIngredientWithProp(prop, ingredients) !== undefined || prototype[prop] !== undefined;
    },
    get(_, prop) {
        return (exports.getIngredientWithProp(prop, ingredients) || prototype)[prop];
    },
    set(_, prop, val) {
        const ingredientWithProp = exports.getIngredientWithProp(prop, ingredients);
        if (ingredientWithProp === undefined)
            throw new Error('Cannot set new properties on Proxies created by ts-mixer');
        ingredientWithProp[prop] = val;
        return true;
    },
    deleteProperty() {
        throw new Error('Cannot delete properties on Proxies created by ts-mixer');
    },
    ownKeys() {
        return ingredients
            .map(Object.getOwnPropertyNames)
            .reduce((prev, curr) => curr.concat(prev.filter(key => curr.indexOf(key) < 0)));
    },
});
exports.proxyMix = proxyMix;
/**
 * Creates a new proxy-prototype object that is a "soft" mixture of the given prototypes.  The mixing is achieved by
 * proxying all property access to the ingredients.  This is not ES5 compatible and less performant.  However, any
 * changes made to the source prototypes will be reflected in the proxy-prototype, which may be desirable.
 */
const softMixProtos = (ingredients, constructor) => exports.proxyMix([...ingredients, { constructor }]);
exports.softMixProtos = softMixProtos;