import { UnifiedNumberFormatOptions } from '@formatjs/intl-unified-numberformat';

export declare type ArgumentElement = BaseElement<TYPE.argument>;

export declare interface BaseElement<T extends TYPE> {
    type: T;
    value: string;
    location?: Location;
}

/**
 * https://github.com/unicode-org/icu/blob/master/docs/userguide/format_parse/numbers/skeletons.md#skeleton-stems-and-options
 */
export declare function convertNumberSkeletonToNumberFormatOptions(tokens: NumberSkeletonToken[]): UnifiedNumberFormatOptions;

export declare function createLiteralElement(value: string): LiteralElement;

export declare function createNumberElement(value: string, style?: string | null): NumberElement;

export declare type DateElement = SimpleFormatElement<TYPE.date, DateTimeSkeleton>;

export declare interface DateTimeSkeleton {
    type: SKELETON_TYPE.dateTime;
    pattern: string;
    location?: Location;
}

export declare type Expectation = ILiteralExpectation | IClassExpectation | IAnyExpectation | IEndExpectation | IOtherExpectation;

export declare interface ExtendedDateTimeFormatOptions extends Intl.DateTimeFormatOptions {
    hourCycle?: 'h11' | 'h12' | 'h23' | 'h24';
}

export declare interface IAnyExpectation {
    type: "any";
}

export declare interface IClassExpectation {
    type: "class";
    parts: IClassParts;
    inverted: boolean;
    ignoreCase: boolean;
}

export declare interface IClassParts extends Array<string | IClassParts> {
}

export declare interface IEndExpectation {
    type: "end";
}

export declare interface IFilePosition {
    offset: number;
    line: number;
    column: number;
}

export declare interface IFileRange {
    start: IFilePosition;
    end: IFilePosition;
}

export declare interface ILiteralExpectation {
    type: "literal";
    text: string;
    ignoreCase: boolean;
}

export declare interface IOtherExpectation {
    type: "other";
    description: string;
}

export declare interface IParseOptions {
    filename?: string;
    startRule?: string;
    tracer?: any;
    [key: string]: any;
}

export declare function isArgumentElement(el: MessageFormatElement): el is ArgumentElement;

export declare function isDateElement(el: MessageFormatElement): el is DateElement;

export declare function isDateTimeSkeleton(el?: DateElement['style'] | TimeElement['style'] | Skeleton): el is DateTimeSkeleton;

/**
 * Type Guards
 */
export declare function isLiteralElement(el: MessageFormatElement): el is LiteralElement;

export declare function isNumberElement(el: MessageFormatElement): el is NumberElement;

export declare function isNumberSkeleton(el: NumberElement['style'] | Skeleton): el is NumberSkeleton;

export declare function isPluralElement(el: MessageFormatElement): el is PluralElement;

export declare function isPoundElement(el: MessageFormatElement): el is PoundElement;

export declare function isSelectElement(el: MessageFormatElement): el is SelectElement;

export declare function isTimeElement(el: MessageFormatElement): el is TimeElement;

export declare type LiteralElement = BaseElement<TYPE.literal>;

export declare interface Location {
    start: LocationDetails;
    end: LocationDetails;
}

export declare interface LocationDetails {
    offset: number;
    line: number;
    column: number;
}

export declare type MessageFormatElement = LiteralElement | ArgumentElement | NumberElement | DateElement | TimeElement | SelectElement | PluralElement | PoundElement;

export declare type NumberElement = SimpleFormatElement<TYPE.number, NumberSkeleton>;

export declare interface NumberSkeleton {
    type: SKELETON_TYPE.number;
    tokens: NumberSkeletonToken[];
    location?: Location;
}

export declare interface NumberSkeletonToken {
    stem: string;
    options: string[];
}

export declare interface Options {
    /**
     * Whether to convert `#` in plural rule options
     * to `{var, number}`
     * Default is true
     */
    normalizeHashtagInPlural?: boolean;
    /**
     * Capture location info in AST
     * Default is false
     */
    captureLocation?: boolean;
}

export declare function parse(input: string, opts?: ParseOptions): MessageFormatElement[];

/**
 * Parse Date time skeleton into Intl.DateTimeFormatOptions
 * Ref: https://unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table
 * @public
 * @param skeleton skeleton string
 */
export declare function parseDateTimeSkeleton(skeleton: string): ExtendedDateTimeFormatOptions;

export declare type ParseFunction = (input: string, options?: IParseOptions) => MessageFormatElement[];

export declare type ParseOptions = Options & IParseOptions;

export declare const pegParse: ParseFunction;

export declare interface PluralElement extends BaseElement<TYPE.plural> {
    options: Record<ValidPluralRule, PluralOrSelectOption>;
    offset: number;
    pluralType: Intl.PluralRulesOptions['type'];
}

export declare interface PluralOrSelectOption {
    value: MessageFormatElement[];
    location?: Location;
}

export declare interface PoundElement {
    type: TYPE.pound;
    location?: Location;
}

export declare interface SelectElement extends BaseElement<TYPE.select> {
    options: Record<string, PluralOrSelectOption>;
}

export declare interface SelectOption {
    id: string;
    value: MessageFormatElement[];
    location?: Location;
}

export declare interface SimpleFormatElement<T extends TYPE, S extends Skeleton> extends BaseElement<T> {
    style?: string | S | null;
}

export declare type Skeleton = NumberSkeleton | DateTimeSkeleton;

export declare const enum SKELETON_TYPE {
    number = 0,
    dateTime = 1
}

export declare class SyntaxError extends Error {
    static buildMessage(expected: Expectation[], found: string | null): string;
    message: string;
    expected: Expectation[];
    found: string | null;
    location: IFileRange;
    name: string;
    constructor(message: string, expected: Expectation[], found: string | null, location: IFileRange);
}

export declare type TimeElement = SimpleFormatElement<TYPE.time, DateTimeSkeleton>;

export declare enum TYPE {
    /**
     * Raw text
     */
    literal = 0,
    /**
     * Variable w/o any format, e.g `var` in `this is a {var}`
     */
    argument = 1,
    /**
     * Variable w/ number format
     */
    number = 2,
    /**
     * Variable w/ date format
     */
    date = 3,
    /**
     * Variable w/ time format
     */
    time = 4,
    /**
     * Variable w/ select format
     */
    select = 5,
    /**
     * Variable w/ plural format
     */
    plural = 6,
    /**
     * Only possible within plural argument.
     * This is the `#` symbol that will be substituted with the count.
     */
    pound = 7
}

export declare type ValidPluralRule = 'zero' | 'one' | 'two' | 'few' | 'many' | 'other' | string;

export { }