import { DateTime, Settings } from 'luxon';
import { defineNuxtPlugin, useCookie, useRouter } from 'nuxt/app';
import type { Pinia } from 'pinia';
import { decodeTime } from 'ulid';

import config from '../data/config.suml';
import translations from '../data/translations.suml';
import baseTranslations from '../locale/_base/translations.suml';
import type { LocaleDescription } from '../locale/locales.ts';
import buildLocaleList from '../src/buildLocaleList.ts';
import type { Pronoun } from '../src/classes.ts';
import { LoadScriptError } from '../src/errors.ts';
import { buildDict } from '../src/helpers.ts';
import { Translator } from '../src/translator.ts';
import { useMainStore } from '../store/index.ts';

declare global {
    interface Window {
        fusetag: any;
    }
}

declare module '#app' {
    interface NuxtApp {
        $translator: Translator;
        $t<T extends string | string[] = string>(key: string, params?: Record<string, string | number>, warn?: boolean): NoInfer<T>;
        $te(key: string, fallback?: boolean): boolean;
        $translateForPronoun(str: string, pronoun: Pronoun | null): string;
        $locales: Record<string, LocaleDescription>;
        $loadScript(name: string, src: string, nonce?: string): Promise<void>;
        $loadStylesheet(name: string, src: string): Promise<void>;
        $datetime(timestamp: number): string;
        $date(timestamp: number): string;
        $ulidTime(ulid: string): number;
    }
}

declare module 'vue' {
    interface ComponentCustomProperties {
        $translator: Translator;
        $t<T extends string | string[] = string>(key: string, params?: Record<string, string | number>, warn?: boolean): NoInfer<T>;
        $te(key: string, fallback?: boolean): boolean;
        $translateForPronoun(str: string, pronoun: Pronoun | null): string;
        $locales: Record<string, LocaleDescription>;
        $loadScript(name: string, src: string, nonce?: string): Promise<void>;
        $loadStylesheet(name: string, src: string): Promise<void>;
        $datetime(timestamp: number): string;
        $date(timestamp: number): string;
        $ulidTime(ulid: string): number;
    }
}

export default defineNuxtPlugin((nuxtApp) => {
    const translator = new Translator(translations, baseTranslations, config);
    const t = (key: string, params = {}, warn = false): string => translator.translate(key, params, warn);
    const te = (key: string, fallback = false): boolean => {
        if (translator.has(key)) {
            return true;
        }
        if (fallback && translator.hasFallback(key)) {
            return true;
        }
        return false;
    };
    const translateForPronoun = (str: string, pronoun: Pronoun | null): string => {
        let translation = translator.translate(`flags.${str.replace(/ /g, '_').replace(/'/g, '*')}`, {}, false) || str;
        if (pronoun) {
            translation = pronoun.format(translation);
        }
        return translation;
    };

    const locales = buildDict(function* () {
        const locales = buildLocaleList(config.locale);
        if (config.locale !== '_') {
            yield [config.locale, locales[config.locale]];
        }
        for (const [locale, localeDescription] of Object.entries(locales)) {
            if (locale !== config.locale) {
                yield [locale, localeDescription];
            }
        }
    });

    const store = useMainStore(nuxtApp.$pinia as Pinia);
    const spellingCookie = useCookie('spelling');
    store.setSpelling(spellingCookie.value ?? null);
    const translationsCookie = useCookie<Record<string, string>>('translations');
    store.restoreTranslations(translationsCookie.value);
    const translationModeVisibleCookie = useCookie('translationModeVisible');
    if (translationModeVisibleCookie.value) {
        store.showTranslationMode();
    }

    const awaitLoadedClass = (node: Element): Promise<void> => {
        return new Promise((resolve) => {
            if (node.classList.contains('loaded')) {
                resolve();
            } else {
                const observer = new MutationObserver((mutations) => {
                    mutations.forEach((mutation) => {
                        const target = mutation.target as Element;
                        if (target.classList.contains('loaded')) {
                            observer.disconnect();
                            resolve();
                        }
                    });
                });

                observer.observe(node, { attributes: true, attributeFilter: ['class'] });
            }
        });
    };

    const loadScript = (name: string, src: string, nonce: string | undefined = undefined): Promise<void> => {
        if (!import.meta.client) {
            return new Promise((resolve) => {
                resolve();
            });
        }

        const existingScriptNode = document.querySelector(`script.${name}-script`);
        if (existingScriptNode) {
            return awaitLoadedClass(existingScriptNode);
        }

        return new Promise((resolve, reject) => {
            const script = document.createElement('script');
            script.setAttribute('src', src);
            if (nonce) {
                script.setAttribute('nonce', nonce);
            }
            script.classList.add(`${name}-script`);
            // script.crossOrigin = 'true'; TODO proper fix (adding it breaks publift)
            script.addEventListener('load', () => {
                script.classList.add('loaded');
                resolve();
            });
            script.addEventListener('error', (event) => {
                script.classList.add('loaded'); // not really loaded, but let's stop other calls from waiting forever, see !493
                reject(new LoadScriptError(name, src, typeof event === 'string' ? event : event.type));
            });
            document.body.appendChild(script);
        });
    };

    const loadStylesheet = (name: string, src: string): Promise<void> => {
        if (!import.meta.client) {
            return new Promise((resolve) => {
                resolve();
            });
        }

        const existingLinkNode = document.querySelector(`link.${name}-stylesheet`);
        if (existingLinkNode) {
            return awaitLoadedClass(existingLinkNode);
        }

        return new Promise((resolve, reject) => {
            const link = document.createElement('link');
            link.setAttribute('rel', 'stylesheet');
            link.setAttribute('href', src);
            link.classList.add(`${name}-stylesheet`);
            link.crossOrigin = 'true';
            link.addEventListener('load', () => {
                link.classList.add('loaded');
                resolve();
            });
            link.addEventListener('error', (event) => {
                link.classList.add('loaded'); // not really loaded, but let's stop other calls from waiting forever, see !493
                reject(new LoadScriptError(name, src, typeof event === 'string' ? event : event.type));
            });
            document.body.appendChild(link);
        });
    };

    try {
        Settings.defaultLocale = config.intlLocale || config.locale;
        DateTime.now().toFormat('y-MM-dd HH:mm'); // test if locale is supported by luxon
    } catch {
        Settings.defaultLocale = 'en';
    }

    const datetime = (timestamp: number): string => {
        const dt = DateTime.fromSeconds(timestamp);
        return dt.toFormat('y-MM-dd HH:mm');
    };

    const date = (timestamp: number): string => {
        const dt = DateTime.fromSeconds(timestamp);
        return dt.toFormat('y-MM-dd');
    };

    const ulidTime = (ulid: string): number => {
        return decodeTime(ulid) / 1000;
    };

    const router = useRouter();
    router.afterEach(() => {
        if (typeof window !== 'undefined' && window.fusetag && window.fusetag.pageInit) {
            window.fusetag.pageInit();
        }
    });

    return {
        provide: {
            translator,
            t,
            te,
            translateForPronoun,
            locales,
            loadScript,
            loadStylesheet,
            datetime,
            date,
            ulidTime,
        },
    };
});