import * as types from "./types";
import { dispatchToMainThread, isMainThread } from "./mainthread-helper";
import { sanitizeModuleName } from "../ui/builder/module-name-sanitizer";
import * as layout from "./layout-helper";

export { layout };
export * from "./mainthread-helper";

export const RESOURCE_PREFIX = "res://";
export const FILE_PREFIX = "file:///";

export function escapeRegexSymbols(source: string): string {
    let escapeRegex = /[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g;

    return source.replace(escapeRegex, "\\$&");
}

export function convertString(value: any): any {
    let result;

    if (!types.isString(value) || value.trim() === "") {
        result = value;
    } else {
        // Try to convert value to number.
        const valueAsNumber = +value;
        if (!isNaN(valueAsNumber)) {
            result = valueAsNumber;
        } else if (value && (value.toLowerCase() === "true" || value.toLowerCase() === "false")) {
            result = value.toLowerCase() === "true" ? true : false;
        } else {
            result = value;
        }
    }

    return result;
}

export function getModuleName(path: string): string {
    let moduleName = path.replace("./", "");

    return sanitizeModuleName(moduleName);
}

export function isFileOrResourcePath(path: string): boolean {
    if (!types.isString(path)) {
        return false;
    }

    return path.indexOf("~/") === 0 ||  // relative to AppRoot
        path.indexOf("/") === 0 ||      // absolute path
        path.indexOf(RESOURCE_PREFIX) === 0;    // resource
}

export function isFontIconURI(uri: string): boolean {
    if (!types.isString(uri)) {
        return false;
    }

    const firstSegment = uri.trim().split("//")[0];

    return firstSegment && firstSegment.indexOf("font:") === 0;
}

export function isDataURI(uri: string): boolean {
    if (!types.isString(uri)) {
        return false;
    }

    const firstSegment = uri.trim().split(",")[0];

    return firstSegment && firstSegment.indexOf("data:") === 0 && firstSegment.indexOf("base64") >= 0;
}

export function mergeSort(arr, compareFunc) {
    if (arr.length < 2) {
        return arr;
    }

    const middle = arr.length / 2;
    const left = arr.slice(0, middle);
    const right = arr.slice(middle, arr.length);

    return merge(mergeSort(left, compareFunc), mergeSort(right, compareFunc), compareFunc);
}

export function merge(left, right, compareFunc) {
    let result = [];
    while (left.length && right.length) {
        if (compareFunc(left[0], right[0]) <= 0) {
            result.push(left.shift());
        } else {
            result.push(right.shift());
        }
    }

    while (left.length) {
        result.push(left.shift());
    }

    while (right.length) {
        result.push(right.shift());
    }

    return result;
}

export function hasDuplicates(arr: Array<any>): boolean {
    return arr.length !== eliminateDuplicates(arr).length;
}

export function eliminateDuplicates(arr: Array<any>): Array<any> {
    return Array.from(new Set(arr));
}

export function executeOnMainThread(func: Function) {
    if (isMainThread()) {
        return func();
    } else {
        dispatchToMainThread(func);
    }
}

export function mainThreadify(func: Function): (...args: any[]) => void {
    return function () {
        const argsToPass = arguments;
        executeOnMainThread(() => func.apply(this, argsToPass));
    };
}