// NG2
import { Injectable } from '@angular/core';
// APP
import { Helpers } from '../../utils/Helpers';
import { NovoLabelService } from '../../services/novo-label-service';

@Injectable()
export class DateFormatService {
    constructor (private labels: NovoLabelService) {}

    getTimeMask(militaryTime: boolean): Array<RegExp> {
        let mask: Array<RegExp> = [/\d/, /\d/, /:/, /\d/, /\d/], timeFormatArray: Array<string> = [], timeFormatPartsArray: Array<string> = [];
        let timeFormat: string = this.labels.timeFormatPlaceholderAM.toLowerCase();
        if (militaryTime) {
            return mask;
        } else {
            timeFormatArray = timeFormat.split('hh:mm');
            if (timeFormatArray && timeFormatArray.length) {
                mask = [];
                for (let timeFormatPart of timeFormatArray) {
                    if (timeFormatPart === '') {
                        mask = mask.concat([/\d/, /\d|:/, /:|\d/, /\d|\w|\s/, /\d|\s|\w/]);
                    } else if (timeFormatPart.length) {
                        for (let i = 0; i < timeFormatPart.length; i++) {
                            mask.push(/\s|\w|\d|\./);
                        }
                    }
                }
            }
        }
        return mask;
    }

    getDateMask(): Array<RegExp> {
        return [ /\d/, /\d|\/|\.|\-/, /\/|\.|\-|\d/, /\d|\/|\.|\-/, /\d|\/|\.|\-/, /\d|\/|\.|\-/, /\d|\/|\.|\-/, /\d|\/|\.|\-/, /\d/, /\d/];
    }

    getTimePlaceHolder(militaryTime: boolean): string {
        if (militaryTime) {
            return this.labels.timeFormatPlaceholder24Hour;
        }
        return this.labels.timeFormatPlaceholderAM;
    }

    parseDateString(dateString: string): [Date, string] {
        let dateFormat: string = this.labels.dateFormat,
            dateFormatRegex = /(\w+)[\/|\.|\-](\w+)[\/|\.|\-](\w+)/gi,
            dateValueRegex = /(\d+)[\/|\.|\-](\d+)[\/|\.|\-](\d+)/gi,
            dateFormatTokens: Array<string>, dateValueTokens: Array<string>, year: number, month: number, day: number, date: Date = new Date();
        if (Helpers.isEmpty(dateFormat)) {
            // Default to MM/dd/yyyy
            dateFormat = 'mm/dd/yyyy';
        } else {
            dateFormat = dateFormat.toLowerCase();
        }
        dateFormatTokens = dateFormatRegex.exec(dateFormat);
        dateValueTokens = dateValueRegex.exec(dateString);
        if (dateFormatTokens && dateFormatTokens.length === 4 && dateValueTokens && dateValueTokens.length === 4) {
            for (let i = 1; i < 4; i++) {
                if (dateFormatTokens[i].includes('m')) {
                    month = parseInt(dateValueTokens[i]) - 1;
                } else if (dateFormatTokens[i].includes('d')) {
                    day = parseInt(dateValueTokens[i]);
                } else {
                    year = parseInt(dateValueTokens[i]);
                }
            }
            if (month >= 0 && month <= 11 && year > 1900 && day > 0 && day <= 31) {
                date = new Date(year, month, day);
            }
        } else if (dateFormatTokens && dateFormatTokens.length === 4 && dateString.length >= 1) {
            let twoTokens = /\d{1,4}(\/|\.|\-)(\d{1,2})/.exec(dateString);
            let oneToken = /^(\d{1,4})$/.exec(dateString);
            let delimiter = /\w+(\/|\.|\-)\w+[\/|\.|\-]\w+/gi.exec(dateFormat);
            let dateStringWithDelimiter = dateString[dateString.length - 1].match(/\/|\.|\-/);
            if (twoTokens && twoTokens.length === 3 && this.isValidDatePart(twoTokens[2], dateFormatTokens[2]) && !dateStringWithDelimiter) {
                dateString = `${dateString}${delimiter[1]}`;
            } else if (oneToken && oneToken.length === 2 && this.isValidDatePart(oneToken[1], dateFormatTokens[1]) && !dateStringWithDelimiter) {
                dateString = `${dateString}${delimiter[1]}`;
            }
        }
        return [date, dateString];
    }

    parseTimeString (timeString: string, militaryTime: boolean): [Date, string] {
        let value: Date = new Date(), timeStringParts: Array<string>, timeFormat: string;
        let amFormat = this.labels.timeFormatAM;
        let pmFormat = this.labels.timeFormatPM;
        if (!(timeString && timeString.includes(':'))) {
            return [value, timeString];
        }
        if (!militaryTime && amFormat && pmFormat) {
            let splits: Array<string> = [], pm: boolean = false;
            amFormat = this.labels.timeFormatAM.toLowerCase();
            pmFormat = this.labels.timeFormatPM.toLowerCase();
            timeString = timeString.toLowerCase();
            if (timeString.includes(amFormat)) {
                splits = timeString.split(amFormat);
            } else if (timeString.includes(pmFormat)) {
                splits = timeString.split(pmFormat);
                pm = true;
            }
            if (splits && splits.length) {
                for (let item of splits) {
                    if (item && item.trim().includes(':')) {
                        timeStringParts = item.trim().split(':');
                    }
                }
            }
            if (timeStringParts && timeStringParts.length && timeStringParts.length === 2) {
                let hours: number = parseInt(timeStringParts[0]);
                if (hours === 12 && pm) {
                    hours = 12;
                } else if (pm) {
                    hours = hours + 12;
                } else if (hours === 12) {
                    hours = 0;
                }
                value.setHours(hours);
                value.setMinutes(parseInt(timeStringParts[1]));
                value.setSeconds(0);
            }
        } else {
            timeStringParts = /(\d{1,2}):(\d{2})/.exec(timeString);
            if (timeStringParts && timeStringParts.length && timeStringParts.length === 3) {
                value.setHours(parseInt(timeStringParts[1]));
                value.setMinutes(parseInt(timeStringParts[2]));
                value.setSeconds(0);
            }
        }
        return [value, timeString];
    }

    parseString(dateTimeString: string, militaryTime: boolean, type: string) {
        switch (type) {
            case 'date':
                return this.parseDateString(dateTimeString);
            case 'time':
                return this.parseTimeString(dateTimeString, militaryTime);
            default:
                return;
        }
    }

    isValidDatePart(value: string, format: string): boolean {
        let datePart = parseInt(value);
        if (format.includes('m') && (datePart >= 2 || value.length === 2)) {
            return true;
        } else if (format.includes('d') && (datePart >= 4 || value.length === 2)) {
            return true;
        } else if (format.includes('y') && datePart >= 1000) {
            return true;
        }
        return false;
    }

}