import type { AppLocale } from "./locale";

export const SITE_NAME_KEY = "siteName";
export const SITE_SETTINGS_KEY = "site_settings";
export const SITE_SETTINGS_ENTITY_TYPE = "site-settings";
export const SITE_SETTINGS_ENTITY_ID = "global";
export const SITE_SETTINGS_FAVICON_FIELD_KEY = "favicon";
export const SITE_SETTINGS_DEFAULT_OG_IMAGE_FIELD_KEY = "defaultOgImage";
export const PAGE_TITLE_TOKEN = "{pageTitle}";
export const SITE_NAME_TOKEN = "{siteName}";

export const DEFAULT_SITE_NAME = "moh-sass";
export const DEFAULT_SITE_DESCRIPTION = "Multilingual Next.js base project";

type SiteLocaleSettings = {
  siteName: string;
  titleTemplate: string;
  siteDescription: string;
  subhead: string;
};

export type SiteSettings = {
  locales: Record<AppLocale, SiteLocaleSettings>;
};

export type SiteSettingsMediaBinding = {
  assetId: string;
  url: string;
};

export type SiteSettingsMediaBindings = {
  favicon: SiteSettingsMediaBinding | null;
  defaultOgImage: SiteSettingsMediaBinding | null;
};

function normalizeSiteLocaleSettings(
  input: unknown,
  fallbackName: string,
  fallbackDescription: string,
): SiteLocaleSettings {
  const value = input && typeof input === "object" ? (input as Record<string, unknown>) : {};

  return {
    siteName:
      typeof value.siteName === "string" && value.siteName.trim()
        ? value.siteName.trim()
        : fallbackName,
    titleTemplate:
      typeof value.titleTemplate === "string" &&
      value.titleTemplate.trim() &&
      value.titleTemplate.includes(PAGE_TITLE_TOKEN)
        ? value.titleTemplate.trim()
        : `${PAGE_TITLE_TOKEN} | ${SITE_NAME_TOKEN}`,
    siteDescription:
      typeof value.siteDescription === "string"
        ? value.siteDescription.trim()
        : fallbackDescription,
    subhead: typeof value.subhead === "string" ? value.subhead.trim() : "",
  };
}

export function getDefaultSiteSettingsMediaBindings(): SiteSettingsMediaBindings {
  return {
    favicon: null,
    defaultOgImage: null,
  };
}

export function buildDefaultSiteSettings(fallbackName = DEFAULT_SITE_NAME): SiteSettings {
  return {
    locales: {
      ar: {
        siteName: fallbackName,
        titleTemplate: `${PAGE_TITLE_TOKEN} | ${SITE_NAME_TOKEN}`,
        siteDescription: DEFAULT_SITE_DESCRIPTION,
        subhead: "",
      },
      en: {
        siteName: fallbackName,
        titleTemplate: `${PAGE_TITLE_TOKEN} | ${SITE_NAME_TOKEN}`,
        siteDescription: DEFAULT_SITE_DESCRIPTION,
        subhead: "",
      },
      de: {
        siteName: fallbackName,
        titleTemplate: `${PAGE_TITLE_TOKEN} | ${SITE_NAME_TOKEN}`,
        siteDescription: DEFAULT_SITE_DESCRIPTION,
        subhead: "",
      },
    },
  };
}

export function parseSiteSettingsValue(
  rawValue: string | null | undefined,
  fallbackName = DEFAULT_SITE_NAME,
): SiteSettings {
  const defaults = buildDefaultSiteSettings(fallbackName);

  if (!rawValue) {
    return defaults;
  }

  try {
    const parsed = JSON.parse(rawValue) as Record<string, unknown>;
    const locales = parsed.locales && typeof parsed.locales === "object"
      ? (parsed.locales as Record<string, unknown>)
      : {};

    const siteSettings: SiteSettings = {
      locales: {
        ar: normalizeSiteLocaleSettings(
          locales.ar && typeof locales.ar === "object" ? (locales.ar as Record<string, unknown>) : {},
          defaults.locales.ar.siteName,
          defaults.locales.ar.siteDescription,
        ),
        en: normalizeSiteLocaleSettings(
          locales.en && typeof locales.en === "object" ? (locales.en as Record<string, unknown>) : {},
          defaults.locales.en.siteName,
          defaults.locales.en.siteDescription,
        ),
        de: normalizeSiteLocaleSettings(
          locales.de && typeof locales.de === "object" ? (locales.de as Record<string, unknown>) : {},
          defaults.locales.de.siteName,
          defaults.locales.de.siteDescription,
        ),
      },
    };

    return siteSettings;
  } catch {
    return defaults;
  }
}