/** A field of a schema form: its dotted schema.org key and how to edit it. */
export interface SchemaField {
  key: string;
  label: string;
  type: 'text' | 'textarea' | 'url' | 'date' | 'datetime' | 'number' | 'select';
  options?: string[];
  /** A select whose choices the site provides, through the panel's env. */
  optionsFrom?: 'businessTypes';
  tip?: string;
  placeholder?: string;
}

export interface SchemaType {
  label: string;
  group: 'Content' | 'Business' | 'Media' | 'Other';
  description: string;
  fields: SchemaField[];
}

/** One entry saved on the post, as the meta field stores it. */
export interface SchemaEntry {
  type: string;
  fields: Record<string, string>;
}

/** What every business on a page carries, wherever it sits. */
const business: SchemaField[] = [
  { key: 'name', label: 'Name', type: 'text' },
  { key: 'description', label: 'Description', type: 'textarea' },
  { key: 'telephone', label: 'Phone', type: 'text' },
  { key: 'email', label: 'Email', type: 'text' },
  {
    key: 'priceRange',
    label: 'Price range',
    type: 'text',
    placeholder: '$$',
    tip: 'How dear it is, as symbols or a range: $$ or 50-150 RON.',
  },
  { key: 'address.streetAddress', label: 'Street', type: 'text' },
  { key: 'address.addressLocality', label: 'City', type: 'text' },
  { key: 'address.addressRegion', label: 'Region', type: 'text' },
  { key: 'address.postalCode', label: 'Postcode', type: 'text' },
  {
    key: 'address.addressCountry',
    label: 'Country',
    type: 'text',
    placeholder: 'RO',
    tip: 'The two-letter country code.',
  },
  { key: 'geo.latitude', label: 'Latitude', type: 'text' },
  { key: 'geo.longitude', label: 'Longitude', type: 'text' },
  {
    key: 'openingHours',
    label: 'Opening hours',
    type: 'textarea',
    placeholder: 'Mo-Fr 09:00-18:00',
    tip: 'One per line, as Mo-Fr 09:00-18:00.',
  },
  { key: 'url', label: 'Website', type: 'url' },
  {
    key: 'sameAs',
    label: 'Profiles',
    type: 'textarea',
    tip: 'One URL per line.',
  },
];

const article: SchemaField[] = [
  {
    key: 'headline',
    label: 'Headline',
    type: 'text',
    tip: 'Empty, the post title is used. Keep it under 110 characters.',
  },
  {
    key: 'description',
    label: 'Description',
    type: 'textarea',
    tip: 'Empty, the meta description is used.',
  },
  {
    key: 'articleSection',
    label: 'Section',
    type: 'text',
    tip: 'The topic or category, such as "Guides".',
  },
  {
    key: 'keywords',
    label: 'Keywords',
    type: 'textarea',
    tip: 'One per line.',
  },
];

/**
 * The schema.org types the editor offers, the way Rank Math lists them,
 * with the fields Google reads for each rich result.
 */
/** Defaults of a post type that the page describes on its own (Titles & meta). */
export const FROM_POST_TYPES: string[] = ['Service', 'Course', 'Person'];

/** Defaults of a post type that print once the page has their details. */
export const DETAIL_TYPES: string[] = [
  'Recipe',
  'Event',
  'JobPosting',
  'VideoObject',
  'SoftwareApplication',
  'Book',
];

export const SCHEMA_TYPES: Record<string, SchemaType> = {
  Article: {
    label: 'Article',
    group: 'Content',
    description:
      'A general article. Dates, author, publisher and image come from the post.',
    fields: article,
  },
  BlogPosting: {
    label: 'Blog post',
    group: 'Content',
    description: 'A blog post; the default for posts.',
    fields: article,
  },
  NewsArticle: {
    label: 'News article',
    group: 'Content',
    description:
      'A news story, eligible for Top Stories. Needs a real publisher and a dateline.',
    fields: [
      ...article,
      {
        key: 'dateline',
        label: 'Dateline',
        type: 'text',
        placeholder: 'Cluj-Napoca, 18 September 2026',
      },
    ],
  },
  Recipe: {
    label: 'Recipe',
    group: 'Content',
    description: 'Ingredients, steps and times for the recipe rich result.',
    fields: [
      {
        key: 'name',
        label: 'Recipe name',
        type: 'text',
        tip: 'Empty, the post title is used.',
      },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'prepTime', label: 'Preparation time (minutes)', type: 'number' },
      { key: 'cookTime', label: 'Cooking time (minutes)', type: 'number' },
      { key: 'totalTime', label: 'Total time (minutes)', type: 'number' },
      {
        key: 'recipeYield',
        label: 'Yield',
        type: 'text',
        placeholder: '4 servings',
      },
      {
        key: 'recipeCategory',
        label: 'Category',
        type: 'text',
        placeholder: 'Dessert',
      },
      {
        key: 'recipeCuisine',
        label: 'Cuisine',
        type: 'text',
        placeholder: 'Italian',
      },
      {
        key: 'nutrition.calories',
        label: 'Calories',
        type: 'text',
        placeholder: '270 calories',
      },
      {
        key: 'recipeIngredient',
        label: 'Ingredients',
        type: 'textarea',
        tip: 'One per line.',
      },
      {
        key: 'recipeInstructions',
        label: 'Steps',
        type: 'textarea',
        tip: 'One step per line.',
      },
    ],
  },
  Event: {
    label: 'Event',
    group: 'Content',
    description:
      'Something happening at a time and place; shows with dates in results.',
    fields: [
      { key: 'name', label: 'Event name', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'startDate', label: 'Starts', type: 'datetime' },
      { key: 'endDate', label: 'Ends', type: 'datetime' },
      {
        key: 'eventStatus',
        label: 'Status',
        type: 'select',
        options: [
          'https://schema.org/EventScheduled',
          'https://schema.org/EventCancelled',
          'https://schema.org/EventPostponed',
          'https://schema.org/EventRescheduled',
          'https://schema.org/EventMovedOnline',
        ],
      },
      {
        key: 'eventAttendanceMode',
        label: 'Attendance',
        type: 'select',
        options: [
          'https://schema.org/OfflineEventAttendanceMode',
          'https://schema.org/OnlineEventAttendanceMode',
          'https://schema.org/MixedEventAttendanceMode',
        ],
      },
      { key: 'location.name', label: 'Venue', type: 'text' },
      { key: 'location.address', label: 'Venue address', type: 'text' },
      { key: 'organizer.name', label: 'Organizer', type: 'text' },
      { key: 'performer.name', label: 'Performer', type: 'text' },
      { key: 'offers.price', label: 'Ticket price', type: 'number' },
      {
        key: 'offers.priceCurrency',
        label: 'Currency',
        type: 'text',
        placeholder: 'EUR',
      },
      { key: 'offers.url', label: 'Ticket URL', type: 'url' },
    ],
  },
  Course: {
    label: 'Course',
    group: 'Content',
    description: 'An educational course with its provider.',
    fields: [
      { key: 'name', label: 'Course name', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'provider.name', label: 'Provider', type: 'text' },
      { key: 'provider.url', label: 'Provider URL', type: 'url' },
    ],
  },
  JobPosting: {
    label: 'Job posting',
    group: 'Business',
    description: 'A job opening, eligible for Google for Jobs.',
    fields: [
      { key: 'title', label: 'Job title', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'datePosted', label: 'Posted on', type: 'date' },
      { key: 'validThrough', label: 'Valid through', type: 'datetime' },
      {
        key: 'employmentType',
        label: 'Employment type',
        type: 'select',
        options: [
          'FULL_TIME',
          'PART_TIME',
          'CONTRACTOR',
          'TEMPORARY',
          'INTERN',
          'VOLUNTEER',
          'PER_DIEM',
          'OTHER',
        ],
      },
      { key: 'hiringOrganization.name', label: 'Company', type: 'text' },
      { key: 'hiringOrganization.sameAs', label: 'Company URL', type: 'url' },
      {
        key: 'jobLocation.address',
        label: 'Location',
        type: 'text',
        placeholder: 'City, Country',
      },
      {
        key: 'baseSalary.currency',
        label: 'Salary currency',
        type: 'text',
        placeholder: 'EUR',
      },
      { key: 'baseSalary.value.value', label: 'Salary', type: 'number' },
      {
        key: 'baseSalary.value.unitText',
        label: 'Salary per',
        type: 'select',
        options: ['HOUR', 'DAY', 'WEEK', 'MONTH', 'YEAR'],
      },
    ],
  },
  Book: {
    label: 'Book',
    group: 'Content',
    description: 'A book with its author and edition.',
    fields: [
      { key: 'name', label: 'Title', type: 'text' },
      { key: 'author.name', label: 'Author', type: 'text' },
      { key: 'isbn', label: 'ISBN', type: 'text' },
      { key: 'bookEdition', label: 'Edition', type: 'text' },
      {
        key: 'bookFormat',
        label: 'Format',
        type: 'select',
        options: [
          'https://schema.org/Hardcover',
          'https://schema.org/Paperback',
          'https://schema.org/EBook',
          'https://schema.org/AudiobookFormat',
        ],
      },
      { key: 'datePublished', label: 'Published on', type: 'date' },
      { key: 'publisher.name', label: 'Publisher', type: 'text' },
    ],
  },
  SoftwareApplication: {
    label: 'Software / app',
    group: 'Other',
    description: 'An app or program, with its platform and price.',
    fields: [
      { key: 'name', label: 'Name', type: 'text' },
      {
        key: 'operatingSystem',
        label: 'Operating system',
        type: 'text',
        placeholder: 'Windows, macOS, Android',
      },
      {
        key: 'applicationCategory',
        label: 'Category',
        type: 'select',
        options: [
          'GameApplication',
          'SocialNetworkingApplication',
          'TravelApplication',
          'ShoppingApplication',
          'SportsApplication',
          'LifestyleApplication',
          'BusinessApplication',
          'DesignApplication',
          'DeveloperApplication',
          'DriverApplication',
          'EducationalApplication',
          'HealthApplication',
          'FinanceApplication',
          'SecurityApplication',
          'BrowserApplication',
          'CommunicationApplication',
          'DesktopEnhancementApplication',
          'EntertainmentApplication',
          'MultimediaApplication',
          'HomeApplication',
          'UtilitiesApplication',
          'ReferenceApplication',
        ],
      },
      {
        key: 'offers.price',
        label: 'Price',
        type: 'number',
        tip: '0 for free.',
      },
      {
        key: 'offers.priceCurrency',
        label: 'Currency',
        type: 'text',
        placeholder: 'USD',
      },
      {
        key: 'aggregateRating.ratingValue',
        label: 'Rating',
        type: 'number',
        placeholder: '4.5',
      },
      {
        key: 'aggregateRating.ratingCount',
        label: 'Rating count',
        type: 'number',
      },
    ],
  },
  VideoObject: {
    label: 'Video',
    group: 'Media',
    description:
      'A video on the page, for video results. Embedded YouTube and Vimeo videos are already in the video sitemap.',
    fields: [
      { key: 'name', label: 'Title', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'thumbnailUrl', label: 'Thumbnail URL', type: 'url' },
      { key: 'uploadDate', label: 'Uploaded on', type: 'date' },
      {
        key: 'duration',
        label: 'Duration',
        type: 'text',
        placeholder: 'PT2M30S',
        tip: 'ISO 8601: PT2M30S is two minutes thirty seconds.',
      },
      { key: 'contentUrl', label: 'Video file URL', type: 'url' },
      { key: 'embedUrl', label: 'Embed URL', type: 'url' },
    ],
  },
  Service: {
    label: 'Service',
    group: 'Business',
    description: 'A service offered by the business.',
    fields: [
      { key: 'name', label: 'Service name', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      {
        key: 'serviceType',
        label: 'Type',
        type: 'text',
        placeholder: 'Plumbing',
      },
      { key: 'provider.name', label: 'Provider', type: 'text' },
      { key: 'areaServed', label: 'Area served', type: 'text' },
      { key: 'offers.price', label: 'Price', type: 'number' },
      { key: 'offers.priceCurrency', label: 'Currency', type: 'text' },
    ],
  },
  Review: {
    label: 'Review',
    group: 'Content',
    description:
      'Your review of a product, book, place or business, with a star rating.',
    fields: [
      {
        key: 'itemReviewed.type',
        label: 'What is reviewed',
        type: 'select',
        options: [
          'Product',
          'Book',
          'Movie',
          'LocalBusiness',
          'Restaurant',
          'SoftwareApplication',
          'Course',
          'Event',
          'Organization',
        ],
      },
      { key: 'itemReviewed.name', label: 'Its name', type: 'text' },
      {
        key: 'reviewRating.ratingValue',
        label: 'Rating (1 to 5)',
        type: 'number',
      },
      { key: 'reviewBody', label: 'Review text', type: 'textarea' },
    ],
  },
  Person: {
    label: 'Person',
    group: 'Other',
    description: 'A person the page is about.',
    fields: [
      { key: 'name', label: 'Name', type: 'text' },
      { key: 'jobTitle', label: 'Job title', type: 'text' },
      { key: 'url', label: 'Website', type: 'url' },
      { key: 'email', label: 'Email', type: 'text' },
      { key: 'telephone', label: 'Phone', type: 'text' },
      {
        key: 'sameAs',
        label: 'Profiles',
        type: 'textarea',
        tip: 'One URL per line: LinkedIn, X, Wikipedia…',
      },
    ],
  },
  Organization: {
    label: 'Organization',
    group: 'Business',
    description:
      'An organization the page is about, other than the site owner.',
    fields: [
      { key: 'name', label: 'Name', type: 'text' },
      { key: 'url', label: 'Website', type: 'url' },
      { key: 'logo', label: 'Logo URL', type: 'url' },
      { key: 'telephone', label: 'Phone', type: 'text' },
      { key: 'email', label: 'Email', type: 'text' },
      {
        key: 'sameAs',
        label: 'Profiles',
        type: 'textarea',
        tip: 'One URL per line.',
      },
    ],
  },
  Dataset: {
    label: 'Dataset',
    group: 'Other',
    description: 'A downloadable dataset, for Google Dataset Search.',
    fields: [
      { key: 'name', label: 'Name', type: 'text' },
      {
        key: 'description',
        label: 'Description',
        type: 'textarea',
        tip: 'At least 50 characters.',
      },
      { key: 'url', label: 'Landing page', type: 'url' },
      { key: 'license', label: 'License URL', type: 'url' },
      {
        key: 'keywords',
        label: 'Keywords',
        type: 'textarea',
        tip: 'One per line.',
      },
    ],
  },
  ClaimReview: {
    label: 'Fact check',
    group: 'Content',
    description: 'A fact check of a claim, with your verdict.',
    fields: [
      { key: 'claimReviewed', label: 'The claim', type: 'text' },
      {
        key: 'reviewRating.ratingValue',
        label: 'Rating (1 false to 5 true)',
        type: 'number',
      },
      {
        key: 'reviewRating.alternateName',
        label: 'Verdict',
        type: 'text',
        placeholder: 'False',
      },
      { key: 'author.name', label: 'Fact checker', type: 'text' },
      { key: 'url', label: 'Fact check URL', type: 'url' },
    ],
  },
  PodcastEpisode: {
    label: 'Podcast episode',
    group: 'Media',
    description: 'An episode with its audio file and series.',
    fields: [
      { key: 'name', label: 'Episode title', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      {
        key: 'associatedMedia.contentUrl',
        label: 'Audio file URL',
        type: 'url',
      },
      { key: 'timeRequired', label: 'Duration (minutes)', type: 'number' },
      { key: 'datePublished', label: 'Published on', type: 'date' },
      { key: 'partOfSeries.name', label: 'Series', type: 'text' },
      { key: 'partOfSeries.url', label: 'Series URL', type: 'url' },
    ],
  },
  Product: {
    label: 'Product',
    group: 'Business',
    description:
      'A product with its price and availability. On a WooCommerce product the catalogue writes one already, and this one takes its place.',
    fields: [
      {
        key: 'name',
        label: 'Name',
        type: 'text',
        tip: 'Empty, the page title is used.',
      },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'brand.name', label: 'Brand', type: 'text' },
      { key: 'sku', label: 'SKU', type: 'text' },
      {
        key: 'gtin',
        label: 'GTIN',
        type: 'text',
        tip: 'The barcode, digits only: GTIN-8, 12, 13 or 14.',
      },
      { key: 'mpn', label: 'MPN', type: 'text' },
      {
        key: 'offers.price',
        label: 'Price',
        type: 'number',
        placeholder: '49.00',
      },
      {
        key: 'offers.priceCurrency',
        label: 'Currency',
        type: 'text',
        placeholder: 'EUR',
      },
      {
        key: 'offers.availability',
        label: 'Availability',
        type: 'select',
        options: [
          'https://schema.org/InStock',
          'https://schema.org/OutOfStock',
          'https://schema.org/PreOrder',
          'https://schema.org/BackOrder',
        ],
      },
      {
        key: 'offers.itemCondition',
        label: 'Condition',
        type: 'select',
        options: [
          'https://schema.org/NewCondition',
          'https://schema.org/RefurbishedCondition',
          'https://schema.org/UsedCondition',
        ],
      },
      {
        key: 'offers.priceValidUntil',
        label: 'Price valid until',
        type: 'date',
      },
      { key: 'offers.url', label: 'Buy URL', type: 'url' },
      { key: 'aggregateRating.ratingValue', label: 'Rating', type: 'number' },
      { key: 'aggregateRating.reviewCount', label: 'Reviews', type: 'number' },
    ],
  },
  LocalBusiness: {
    label: 'Local business',
    group: 'Business',
    description:
      'A business with an address and opening hours. Pick the kind it is; the site-wide one lives in Local SEO.',
    fields: [
      {
        key: 'businessType',
        label: 'Business type',
        type: 'select',
        optionsFrom: 'businessTypes',
        tip: 'The schema.org type printed for it. The more exact, the better: Dentist over LocalBusiness.',
      },
      ...business,
    ],
  },
  Restaurant: {
    label: 'Restaurant',
    group: 'Business',
    description: 'A place that serves food, with its cuisine and its menu.',
    fields: [
      ...business,
      {
        key: 'servesCuisine',
        label: 'Cuisine',
        type: 'textarea',
        placeholder: 'Italian',
        tip: 'One per line.',
      },
      { key: 'menu', label: 'Menu URL', type: 'url' },
      {
        key: 'acceptsReservations',
        label: 'Reservations',
        type: 'select',
        options: ['True', 'False'],
      },
    ],
  },
  MusicAlbum: {
    label: 'Music album',
    group: 'Media',
    description: 'An album or a single, with the artist behind it.',
    fields: [
      { key: 'name', label: 'Album', type: 'text' },
      { key: 'byArtist.name', label: 'Artist', type: 'text' },
      { key: 'numTracks', label: 'Tracks', type: 'number' },
      { key: 'genre', label: 'Genre', type: 'text' },
      { key: 'datePublished', label: 'Released on', type: 'date' },
      {
        key: 'albumReleaseType',
        label: 'Release type',
        type: 'select',
        options: [
          'https://schema.org/AlbumRelease',
          'https://schema.org/SingleRelease',
          'https://schema.org/EPRelease',
          'https://schema.org/BroadcastRelease',
        ],
      },
      { key: 'url', label: 'Listen at', type: 'url' },
    ],
  },
  MusicGroup: {
    label: 'Band or musician',
    group: 'Media',
    description: 'The artist behind the music, with their profiles.',
    fields: [
      { key: 'name', label: 'Name', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'genre', label: 'Genre', type: 'text' },
      { key: 'foundingDate', label: 'Active since', type: 'date' },
      { key: 'url', label: 'Website', type: 'url' },
      {
        key: 'sameAs',
        label: 'Profiles',
        type: 'textarea',
        tip: 'One URL per line.',
      },
    ],
  },
  ItemList: {
    label: 'Carousel',
    group: 'Other',
    description:
      'A list of pages Google may show as a carousel, in the order given here.',
    fields: [
      { key: 'name', label: 'List name', type: 'text' },
      {
        key: 'itemListElement',
        label: 'Items',
        type: 'textarea',
        placeholder: 'Hoodies | https://example.com/hoodies/',
        tip: 'One per line: a name, a vertical bar, the URL. A URL on its own works too.',
      },
    ],
  },
  Speakable: {
    label: 'Speakable',
    group: 'Other',
    description:
      'The parts a voice assistant may read aloud. It marks the page itself instead of adding an object of its own.',
    fields: [
      {
        key: 'cssSelector',
        label: 'CSS selectors',
        type: 'textarea',
        placeholder: '.entry-title',
        tip: 'One per line.',
      },
      {
        key: 'xpath',
        label: 'XPath',
        type: 'textarea',
        placeholder: '/html/head/title',
        tip: 'One per line, instead of the selectors above rather than next to them.',
      },
    ],
  },
};

/**
 * What Google needs for the rich result of a type, past what the page fills
 * in itself (the name from the title, the image from the page). A list
 * inside is a choice: one of them is enough.
 */
export const REQUIRED_FIELDS: Record<string, (string | string[])[]> = {
  Event: ['startDate', ['location.name', 'location.address']],
  JobPosting: [
    'title',
    'description',
    'datePosted',
    'hiringOrganization.name',
    'jobLocation.address',
  ],
  VideoObject: ['thumbnailUrl', 'uploadDate'],
  SoftwareApplication: ['offers.price', 'aggregateRating.ratingValue'],
  Review: ['itemReviewed.name', 'reviewRating.ratingValue'],
  ClaimReview: ['claimReviewed', 'reviewRating.alternateName'],
  Course: ['description', 'provider.name'],
  Dataset: ['description'],
  LocalBusiness: ['address.streetAddress', 'address.addressLocality'],
  Restaurant: ['address.streetAddress', 'address.addressLocality'],
};

/**
 * The required fields an entry leaves empty, by their labels: an Event with
 * only a name printed with no date and no place, and Search Console called
 * it invalid.
 */
export const missingRequired = (entry: SchemaEntry): string[] => {
  const type = SCHEMA_TYPES[entry.type];
  const labelOf = (key: string): string =>
    type?.fields.find(field => field.key === key)?.label ?? key;
  const filled = (key: string): boolean =>
    (entry.fields[key] ?? '').trim() !== '';
  return (REQUIRED_FIELDS[entry.type] ?? [])
    .filter(need => (Array.isArray(need) ? !need.some(filled) : !filled(need)))
    .map(need =>
      Array.isArray(need) ? need.map(labelOf).join(' or ') : labelOf(need)
    );
};

/** Whether a field is one Google asks for, alone or as one of a choice. */
export const isRequired = (type: string, key: string): boolean =>
  (REQUIRED_FIELDS[type] ?? []).some(need =>
    Array.isArray(need) ? need.includes(key) : need === key
  );

export const parseEntries = (raw: unknown): SchemaEntry[] => {
  if (typeof raw !== 'string' || raw.trim() === '') {
    return [];
  }
  try {
    const decoded = JSON.parse(raw);
    return Array.isArray(decoded)
      ? decoded
          .filter(item => item && typeof item.type === 'string')
          .map(item => ({
            type: String(item.type),
            fields: { ...(item.fields ?? {}) },
          }))
      : [];
  } catch {
    return [];
  }
};

export const serializeEntries = (entries: SchemaEntry[]): string =>
  entries.length === 0 ? '' : JSON.stringify(entries);