import { Inject, Injectable } from '@angular/core';
import { config, IConfig } from './config';

@Injectable()
export class MaskApplierService {

    public dropSpecialCharacters: IConfig['dropSpecialCharacters'];
    public showTemplate: IConfig['showTemplate'];
    public clearIfNotMatch: IConfig['clearIfNotMatch'];
    public maskExpression: string = '';
    public maskSpecialCharacters: IConfig['specialCharacters'];
    public maskAvailablePatterns: IConfig['patterns'];
    public prefix: IConfig['prefix'];
    public sufix: IConfig['sufix'];


    private _shift: Set<number>;

    public constructor(
        @Inject(config) protected _config: IConfig
    ) {
        this._shift = new Set();
        this.maskSpecialCharacters = this._config!.specialCharacters;
        this.maskAvailablePatterns = this._config.patterns;

        this.clearIfNotMatch = this._config.clearIfNotMatch;
        this.dropSpecialCharacters = this._config.dropSpecialCharacters;
        this.maskSpecialCharacters = this._config!.specialCharacters;
        this.maskAvailablePatterns = this._config.patterns;
        this.prefix = this._config.prefix;
        this.sufix = this._config.sufix;

    }

    public applyMask(
        inputValue: string,
        maskExpression: string,
        position: number = 0,
        cb: Function = () => {}
    ): string {
        if (inputValue === undefined || inputValue === null || maskExpression === undefined) {
            return '';
        }

        let cursor: number = 0;
        let result: string = ``;
        let multi: boolean = false;

        if (inputValue.slice(0, this.prefix.length) === this.prefix) {
            inputValue = inputValue.slice(this.prefix.length, inputValue.length);
        }

        const inputArray: string[] = inputValue.toString()
            .split('');

        // tslint:disable-next-line
        for (let i: number = 0, inputSymbol: string = inputArray[0]; i
        < inputArray.length; i++, inputSymbol = inputArray[i]) {
            if (cursor === maskExpression.length) {
                break;
            }

            if (this._checkSymbolMask(inputSymbol, maskExpression[cursor]) && maskExpression[cursor + 1] === '?') {
                result += inputSymbol;
                cursor += 2;
            } else if (this._checkSymbolMask(inputSymbol, maskExpression[cursor])
                && maskExpression[cursor + 1]
                === '*') {
                result += inputSymbol;
                multi = true;
            } else if (
                maskExpression[cursor + 1] === '*' && multi
                && this._checkSymbolMask(inputSymbol, maskExpression[cursor + 2])
            ) {
                result += inputSymbol;
                cursor += 3;
                multi = false;
            } else if (maskExpression[cursor + 1] === '?' && this._checkSymbolMask(
                inputSymbol,
                maskExpression[cursor + 2]
            )) {
                result += inputSymbol;
                cursor += 3;
            } else if (this._checkSymbolMask(inputSymbol, maskExpression[cursor])) {
                result += inputSymbol;
                cursor++;
            } else if (this.maskSpecialCharacters.indexOf(maskExpression[cursor]) !== -1) {
                result += maskExpression[cursor];
                cursor++;
                const shiftStep: number = /\*|\?/g.test(maskExpression.slice(0, cursor))
                    ? inputArray.length
                    : cursor;
                this._shift.add(shiftStep + this.prefix.length || 0);
                i--;
            } else if (this.maskSpecialCharacters.indexOf(inputSymbol) > -1
                && this.maskAvailablePatterns[maskExpression[cursor]]
                && this.maskAvailablePatterns[maskExpression[cursor]].optional) {
                cursor++;
                i--;
            }
        }

        if (result.length + 1 === maskExpression.length
            && this.maskSpecialCharacters.indexOf(maskExpression[maskExpression.length - 1]) !== -1) {
            result += maskExpression[maskExpression.length - 1];
        }

        let shift: number = 1;
        let newPosition: number = position + 1;

        while (this._shift.has(newPosition)) {
            shift++;
            newPosition++;
        }

        cb(this._shift.has(position) ? shift : 0);

        return this.prefix + result;
    }

    private _checkSymbolMask(inputSymbol: string, maskSymbol: string): boolean {
        return inputSymbol === maskSymbol
            || this.maskAvailablePatterns[maskSymbol]
            && this.maskAvailablePatterns[maskSymbol].pattern
            && this.maskAvailablePatterns[maskSymbol].pattern.test(inputSymbol);
    }
}