"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
// @flow
const hyphenateStyleName_1 = __importDefault(require("fbjs/lib/hyphenateStyleName"));
const exotic_1 = require("exotic");
exports.objToCss = (obj, prevKey) => {
    const css = Object.keys(obj)
        .filter(key => {
        const chunk = obj[key];
        return (chunk !== undefined && chunk !== null && chunk !== false && chunk !== '');
    })
        .map(key => {
        if (exotic_1.isObjPlain(obj[key]))
            return exports.objToCss(obj[key], key);
        return `${hyphenateStyleName_1.default(key)}: ${obj[key]};`;
    })
        .join(' ');
    return prevKey
        ? `${prevKey} {
  ${css}
}`
        : css;
};
const flatten = (chunks, executionContext) => chunks.reduce((ruleSet, chunk) => {
    /* Remove falsey values */
    if (chunk === undefined ||
        chunk === null ||
        chunk === false ||
        chunk === '') {
        return ruleSet;
    }
    /* Flatten ruleSet */
    if (Array.isArray(chunk)) {
        return [...ruleSet, ...flatten(chunk, executionContext)];
    }
    /* Handle other components */
    if (chunk.hasOwnProperty('styledComponentId')) {
        // $FlowFixMe not sure how to make this pass
        return [...ruleSet, `.${chunk.styledComponentId}`];
    }
    /* Either execute or defer the function */
    if (typeof chunk === 'function') {
        return executionContext
            ? ruleSet.concat(...flatten([chunk(executionContext)], executionContext))
            : ruleSet.concat(chunk);
    }
    /* Handle objects */
    return ruleSet.concat(
    // $FlowFixMe have to add %checks somehow to isPlainObject
    exotic_1.isObjPlain(chunk) ? exports.objToCss(chunk) : chunk.toString());
}, []);
exports.default = flatten;
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