import { matchAnyPattern, repeatedTimeunitPattern } from "../../utils/pattern";
import { findMostLikelyADYear } from "../../calculation/years";
import { Duration } from "../../calculation/duration";
import { Timeunit } from "../../types";

export const WEEKDAY_DICTIONARY: { [word: string]: number } = {
    "söndag": 0,
    "sön": 0,
    "so": 0,
    "måndag": 1,
    "mån": 1,
    "må": 1,
    "tisdag": 2,
    "tis": 2,
    "ti": 2,
    "onsdag": 3,
    "ons": 3,
    "on": 3,
    "torsdag": 4,
    "tors": 4,
    "to": 4,
    "fredag": 5,
    "fre": 5,
    "fr": 5,
    "lördag": 6,
    "lör": 6,
    "lö": 6,
};

export const MONTH_DICTIONARY: { [word: string]: number } = {
    "januari": 1,
    "jan": 1,
    "jan.": 1,
    "februari": 2,
    "feb": 2,
    "feb.": 2,
    "mars": 3,
    "mar": 3,
    "mar.": 3,
    "april": 4,
    "apr": 4,
    "apr.": 4,
    "maj": 5,
    "juni": 6,
    "jun": 6,
    "jun.": 6,
    "juli": 7,
    "jul": 7,
    "jul.": 7,
    "augusti": 8,
    "aug": 8,
    "aug.": 8,
    "september": 9,
    "sep": 9,
    "sep.": 9,
    "sept": 9,
    "oktober": 10,
    "okt": 10,
    "okt.": 10,
    "november": 11,
    "nov": 11,
    "nov.": 11,
    "december": 12,
    "dec": 12,
    "dec.": 12,
};

export const ORDINAL_NUMBER_DICTIONARY: { [word: string]: number } = {
    "första": 1,
    "andra": 2,
    "tredje": 3,
    "fjärde": 4,
    "femte": 5,
    "sjätte": 6,
    "sjunde": 7,
    "åttonde": 8,
    "nionde": 9,
    "tionde": 10,
    "elfte": 11,
    "tolfte": 12,
    "trettonde": 13,
    "fjortonde": 14,
    "femtonde": 15,
    "sextonde": 16,
    "sjuttonde": 17,
    "artonde": 18,
    "nittonde": 19,
    "tjugonde": 20,
    "tjugoförsta": 21,
    "tjugoandra": 22,
    "tjugotredje": 23,
    "tjugofjärde": 24,
    "tjugofemte": 25,
    "tjugosjätte": 26,
    "tjugosjunde": 27,
    "tjugoåttonde": 28,
    "tjugonionde": 29,
    "trettionde": 30,
    "trettioförsta": 31,
};

export const INTEGER_WORD_DICTIONARY: { [word: string]: number } = {
    "en": 1,
    "ett": 1,
    "två": 2,
    "tre": 3,
    "fyra": 4,
    "fem": 5,
    "sex": 6,
    "sju": 7,
    "åtta": 8,
    "nio": 9,
    "tio": 10,
    "elva": 11,
    "tolv": 12,
    "tretton": 13,
    "fjorton": 14,
    "femton": 15,
    "sexton": 16,
    "sjutton": 17,
    "arton": 18,
    "nitton": 19,
    "tjugo": 20,
    "trettiо": 30,
    "fyrtio": 40,
    "femtio": 50,
    "sextio": 60,
    "sjuttio": 70,
    "åttio": 80,
    "nittio": 90,
    "hundra": 100,
    "tusen": 1000,
};

export const TIME_UNIT_DICTIONARY: { [word: string]: Timeunit } = {
    "sek": "second",
    "sekund": "second",
    "sekunder": "second",
    "min": "minute",
    "minut": "minute",
    "minuter": "minute",
    "tim": "hour",
    "timme": "hour",
    "timmar": "hour",
    "dag": "day",
    "dagar": "day",
    "vecka": "week",
    "veckor": "week",
    "mån": "month",
    "månad": "month",
    "månader": "month",
    "år": "year",
    "kvartаl": "quarter",
    "kvartal": "quarter",
};

export const TIME_UNIT_NO_ABBR_DICTIONARY: { [word: string]: Timeunit } = {
    "sekund": "second",
    "sekunder": "second",
    "minut": "minute",
    "minuter": "minute",
    "timme": "hour",
    "timmar": "hour",
    "dag": "day",
    "dagar": "day",
    "vecka": "week",
    "veckor": "week",
    "månad": "month",
    "månader": "month",
    "år": "year",
    "kvartal": "quarter",
};

export function parseDuration(timeunitText): Duration {
    const fragments = {};
    let remainingText = timeunitText;
    let match = SINGLE_TIME_UNIT_REGEX.exec(remainingText);
    while (match) {
        collectDateTimeFragment(fragments, match);
        remainingText = remainingText.substring(match[0].length);
        match = SINGLE_TIME_UNIT_REGEX.exec(remainingText);
    }
    return fragments as Duration;
}

function collectDateTimeFragment(fragments, match) {
    const num = parseNumberPattern(match[1]);
    const unit = TIME_UNIT_DICTIONARY[match[2].toLowerCase()];
    fragments[unit] = num;
}

export const NUMBER_PATTERN = `(?:${matchAnyPattern(INTEGER_WORD_DICTIONARY)}|\\d+)`;
export const ORDINAL_NUMBER_PATTERN = `(?:${matchAnyPattern(ORDINAL_NUMBER_DICTIONARY)}|\\d{1,2}(?:e|:e))`;
export const TIME_UNIT_PATTERN = `(?:${matchAnyPattern(TIME_UNIT_DICTIONARY)})`;

const SINGLE_TIME_UNIT_PATTERN = `(${NUMBER_PATTERN})\\s{0,5}(${matchAnyPattern(TIME_UNIT_DICTIONARY)})\\s{0,5}`;
const SINGLE_TIME_UNIT_REGEX = new RegExp(SINGLE_TIME_UNIT_PATTERN, "i");

const SINGLE_TIME_UNIT_NO_ABBR_PATTERN = `(${NUMBER_PATTERN})\\s{0,5}(${matchAnyPattern(
    TIME_UNIT_NO_ABBR_DICTIONARY
)})\\s{0,5}`;

export const TIME_UNITS_PATTERN = repeatedTimeunitPattern("", SINGLE_TIME_UNIT_PATTERN);
export const TIME_UNITS_NO_ABBR_PATTERN = repeatedTimeunitPattern("", SINGLE_TIME_UNIT_NO_ABBR_PATTERN);

export function parseNumberPattern(match: string): number {
    const num = match.toLowerCase();
    if (INTEGER_WORD_DICTIONARY[num] !== undefined) {
        return INTEGER_WORD_DICTIONARY[num];
    }
    return parseInt(num);
}

export function parseOrdinalNumberPattern(match: string): number {
    const num = match.toLowerCase();
    if (ORDINAL_NUMBER_DICTIONARY[num] !== undefined) {
        return ORDINAL_NUMBER_DICTIONARY[num];
    }
    return parseInt(num);
}

export function parseYear(match: string): number {
    if (/\d+/.test(match)) {
        let yearNumber = parseInt(match);
        if (yearNumber < 100) {
            yearNumber = findMostLikelyADYear(yearNumber);
        }
        return yearNumber;
    }

    const num = match.toLowerCase();
    if (INTEGER_WORD_DICTIONARY[num] !== undefined) {
        return INTEGER_WORD_DICTIONARY[num];
    }

    return parseInt(match);
}