/**
 * Domain model for a Store.
 * Normalizes data coming from SIW's /StoreLocation and /StoreGeneral endpoints.
 */

const MAX_BRANDS = 3;

/**
 * Extract a deduplicated list of brand names from a SIW general payload.
 *
 * Known shapes (most common first):
 *   1. /StoreGeneral/{n}: `pimary_brand_name` (sic — typo in the upstream API,
 *      kept here for safety), `primary_brand_name`, `secondary_brand_name`,
 *      `tertiary_brand_name`.
 *   2. Array-of-strings or array-of-objects: `brands`, `brand_names`,
 *      `brand_list`, `brand_display_names`.
 *   3. Numbered `brand_1..N` (also `brand1`, `brand_name_1`,
 *      `brand_display_name_1`).
 *   4. Single-brand fields: `brand_display_name`, `brand_name`, `brand`,
 *      `primary_brand`.
 *
 * Returns at most MAX_BRANDS entries (case-insensitively deduplicated).
 */
function extractBrands(data) {
  if (!data) return [];

  const brands = [];

  const pushBrand = value => {
    if (value == null) return;
    const str = String(value).trim();
    if (!str) return;
    if (!brands.some(b => b.toLowerCase() === str.toLowerCase())) {
      brands.push(str);
    }
  };

  const pushFromArray = arr => {
    if (!Array.isArray(arr)) return false;
    let pushed = false;
    arr.forEach(b => {
      if (typeof b === 'string') {
        pushBrand(b);
        pushed = true;
      } else if (b && typeof b === 'object') {
        pushBrand(b.brand_display_name || b.brand_name || b.name || b.display_name);
        pushed = true;
      }
    });
    return pushed;
  };

  // 1) Named primary/secondary/tertiary (the real SIW /StoreGeneral shape).
  //    Note: upstream typo `pimary_brand_name` is real — handle both.
  pushBrand(data.primary_brand_name || data.pimary_brand_name);
  pushBrand(data.secondary_brand_name);
  pushBrand(data.tertiary_brand_name);

  if (brands.length > 0) return brands.slice(0, MAX_BRANDS);

  // 2) Array forms.
  for (const key of ['brands', 'brand_names', 'brand_list', 'brand_display_names']) {
    if (pushFromArray(data[key])) break;
  }

  // 3) Numbered single-value fields.
  if (brands.length === 0) {
    for (let i = 1; i <= MAX_BRANDS + 2; i++) {
      pushBrand(
        data[`brand_${i}`] ||
          data[`brand${i}`] ||
          data[`brand_name_${i}`] ||
          data[`brand_display_name_${i}`]
      );
    }
  }

  // 4) Single brand fallback.
  if (brands.length === 0) {
    pushBrand(data.brand_display_name || data.brand_name || data.brand || data.primary_brand);
  }

  return brands.slice(0, MAX_BRANDS);
}

class Store {
  /**
   * @param {object|null} locationData  /StoreLocation/{n} payload (address etc.)
   * @param {string|number} storeNumber
   * @param {object} [options]
   * @param {object|null} [options.general]  /StoreGeneral/{n} payload
   *   (brands, status, environment, etc.)
   */
  constructor(locationData, storeNumber, options = {}) {
    // ES default params only trigger on `undefined`, not `null`. SIW returns
    // null for stores it has no record of, so we have to coerce here.
    const d = locationData || {};
    const g = options.general || {};

    this.number = String(storeNumber || d.store_number || g.store_number || '').trim();
    this.name = d.name || d.store_name || `Store ${this.number}`;

    // Brand / status / environment come from /StoreGeneral; fall back to
    // location data only if a flat object happened to carry them.
    this.brands = extractBrands(g).length > 0 ? extractBrands(g) : extractBrands(d);
    this.status = g.store_status_name || d.store_status_name || null;
    this.environment = g.environment_name || d.environment_name || null;

    this.address = d.address || '';
    this.address2 = d.address2 || '';
    this.address3 = d.address3 || '';
    this.city = d.city || '';
    this.state = d.state || '';
    this.postalCode = d.postal_code || '';
    this.countryCode = d.country_code || 'US';
    this.phone = d.phone || '';
    this.districtId = d.district_id || null;
    this.regionId = d.region_id || null;

    this.hasLocationData = !!locationData;
    this.hasGeneralData = !!options.general;
  }

  get fullAddress() {
    const parts = [this.address, this.address2, this.address3].filter(Boolean);
    const cityState = `${this.city}, ${this.state} ${this.postalCode}`.trim();
    return [...parts, cityState, this.phone ? `Phone: ${this.phone}` : '']
      .filter(Boolean)
      .join('\n');
  }

  toSummary() {
    if (!this.hasLocationData && !this.hasGeneralData) {
      // Trailing \n\n so the section splitter in bot/handlers.js can cleanly
      // separate this from whatever section comes next.
      return `### Store ${this.number}\n\n_⚠️ No SIW record found for this store._\n\n`;
    }

    const lines = [`### Store ${this.number} - ${this.name}`, '', '**ℹ️ Details**'];

    if (this.brands.length > 0) {
      const label = this.brands.length === 1 ? 'Brand' : 'Brands';
      lines.push(`${label}: ${this.brands.join(', ')}`);
    }

    // Status + Environment on one line for compactness; only render if at
    // least one is known.
    if (this.status || this.environment) {
      const bits = [];
      if (this.status) bits.push(`Status: ${this.status}`);
      if (this.environment) bits.push(`Environment: ${this.environment}`);
      lines.push(bits.join('  |  '));
    }

    if (this.fullAddress) {
      lines.push(this.fullAddress);
    }

    lines.push(`District ID: ${this.districtId || 'N/A'} Region ID: ${this.regionId || 'N/A'}`);

    // Trailing blank line so the next section (Meraki network header) is
    // separated by \n\n** which the section splitter understands.
    lines.push('');
    return lines.join('\n') + '\n';
  }
}

function createStore(locationData, storeNumber, options) {
  return new Store(locationData, storeNumber, options);
}

module.exports = { Store, createStore, extractBrands };