/*!
  * @intlify/runtime v9.1.9
  * (c) 2021 kazuya kawaguchi
  * Released under the MIT License.
  */
import { isNumber, isObject, isString, isFunction, isPlainObject, toDisplayString } from '@intlify/shared';

const DEFAULT_MODIFIER = (str) => str;
const DEFAULT_MESSAGE = (ctx) => ''; // eslint-disable-line
const DEFAULT_MESSAGE_DATA_TYPE = 'text';
const DEFAULT_NORMALIZE = (values) => values.length === 0 ? '' : values.join('');
const DEFAULT_INTERPOLATE = toDisplayString;
function pluralDefault(choice, choicesLength) {
    choice = Math.abs(choice);
    if (choicesLength === 2) {
        // prettier-ignore
        return choice
            ? choice > 1
                ? 1
                : 0
            : 1;
    }
    return choice ? Math.min(choice, 2) : 0;
}
function getPluralIndex(options) {
    // prettier-ignore
    const index = isNumber(options.pluralIndex)
        ? options.pluralIndex
        : -1;
    // prettier-ignore
    return options.named && (isNumber(options.named.count) || isNumber(options.named.n))
        ? isNumber(options.named.count)
            ? options.named.count
            : isNumber(options.named.n)
                ? options.named.n
                : index
        : index;
}
function normalizeNamed(pluralIndex, props) {
    if (!props.count) {
        props.count = pluralIndex;
    }
    if (!props.n) {
        props.n = pluralIndex;
    }
}
function createMessageContext(options = {}) {
    const locale = options.locale;
    const pluralIndex = getPluralIndex(options);
    const pluralRule = isObject(options.pluralRules) &&
        isString(locale) &&
        isFunction(options.pluralRules[locale])
        ? options.pluralRules[locale]
        : pluralDefault;
    const orgPluralRule = isObject(options.pluralRules) &&
        isString(locale) &&
        isFunction(options.pluralRules[locale])
        ? pluralDefault
        : undefined;
    const plural = (messages) => messages[pluralRule(pluralIndex, messages.length, orgPluralRule)];
    const _list = options.list || [];
    const list = (index) => _list[index];
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const _named = options.named || {};
    isNumber(options.pluralIndex) && normalizeNamed(pluralIndex, _named);
    const named = (key) => _named[key];
    // TODO: need to design resolve message function?
    function message(key) {
        // prettier-ignore
        const msg = isFunction(options.messages)
            ? options.messages(key)
            : isObject(options.messages)
                ? options.messages[key]
                : false;
        return !msg
            ? options.parent
                ? options.parent.message(key) // resolve from parent messages
                : DEFAULT_MESSAGE
            : msg;
    }
    const _modifier = (name) => options.modifiers
        ? options.modifiers[name]
        : DEFAULT_MODIFIER;
    const normalize = isPlainObject(options.processor) && isFunction(options.processor.normalize)
        ? options.processor.normalize
        : DEFAULT_NORMALIZE;
    const interpolate = isPlainObject(options.processor) &&
        isFunction(options.processor.interpolate)
        ? options.processor.interpolate
        : DEFAULT_INTERPOLATE;
    const type = isPlainObject(options.processor) && isString(options.processor.type)
        ? options.processor.type
        : DEFAULT_MESSAGE_DATA_TYPE;
    const ctx = {
        ["list" /* LIST */]: list,
        ["named" /* NAMED */]: named,
        ["plural" /* PLURAL */]: plural,
        ["linked" /* LINKED */]: (key, modifier) => {
            // TODO: should check `key`
            const msg = message(key)(ctx);
            return isString(modifier) ? _modifier(modifier)(msg) : msg;
        },
        ["message" /* MESSAGE */]: message,
        ["type" /* TYPE */]: type,
        ["interpolate" /* INTERPOLATE */]: interpolate,
        ["normalize" /* NORMALIZE */]: normalize
    };
    return ctx;
}

export { DEFAULT_MESSAGE_DATA_TYPE, createMessageContext };