/**
 * Company info used on every report header (PDF + print). Read from
 * the environment so the office can edit it without a code change —
 * the .env.example file lists the keys; defaults below are placeholders
 * the office should override for production.
 *
 * Single source of truth: the API renders the header. The web header
 * (login + AppShell) still reads the static "Jorge Cuadros & Asociados"
 * strings for now — those are visual brand, the API's COMPANY_INFO
 * block is the legal/locator block on printed documents.
 */

import * as fs from "node:fs";
import * as path from "node:path";

export interface CompanyInfo {
  name: string;
  /** Street address — line 1. */
  addressLine1: string;
  /** Street address — line 2 (suite, floor, etc.). Optional. */
  addressLine2: string;
  /** "City, State, ZIP, Country" — single line. */
  cityState: string;
  phone: string;
  email: string;
  /** Mexican tax ID ("RFC"). Optional. */
  taxId: string;
  website: string;
  /** Absolute path to the logo PNG. Null when missing — renderers fall
   *  back to a text mark. */
  logoPath: string | null;
  /** Logo buffer + intrinsic size, eagerly loaded so the PDF renderer
   *  doesn't do a sync read on every report. Null when no logo. */
  logo: { buffer: Buffer; width: number; height: number } | null;
}

function envOr(key: string, fallback: string): string {
  const v = process.env[key];
  return v && v.trim() ? v : fallback;
}

function resolveLogoPath(): string | null {
  const explicit = process.env.COMPANY_LOGO_PATH;
  if (explicit) {
    return fs.existsSync(explicit) ? explicit : null;
  }
  // Default: look in apps/api/assets/company_logo.png (copied from
  // apps/web/public/images/company_logo.png — single canonical image
  // kept in lock-step; see .env.example for the override path).
  const candidates = [
    path.resolve(__dirname, "..", "..", "assets", "company_logo.png"),
    path.resolve(__dirname, "..", "..", "..", "web", "public", "images", "company_logo.png"),
  ];
  for (const c of candidates) {
    if (fs.existsSync(c)) return c;
  }
  return null;
}

let cached: CompanyInfo | null = null;

export function getCompanyInfo(): CompanyInfo {
  if (cached) return cached;
  const logoPath = resolveLogoPath();
  let logo: CompanyInfo["logo"] = null;
  if (logoPath) {
    try {
      const buf = fs.readFileSync(logoPath);
      // Intrinsic PNG size: read IHDR (bytes 16-23 of the file).
      // Width = BE uint32 at offset 16, height = BE uint32 at offset 20.
      const w =
        logoPath.endsWith(".png") && buf.length >= 24
          ? buf.readUInt32BE(16)
          : 0;
      const h =
        logoPath.endsWith(".png") && buf.length >= 24
          ? buf.readUInt32BE(20)
          : 0;
      logo = { buffer: buf, width: w, height: h };
    } catch {
      logo = null;
    }
  }
  cached = {
    name: envOr("COMPANY_NAME", "Jorge Cuadros & Asociados"),
    addressLine1: envOr(
      "COMPANY_ADDRESS_LINE1",
      "Av. Revolución 1234, Int. 5",
    ),
    addressLine2: envOr("COMPANY_ADDRESS_LINE2", ""),
    cityState: envOr(
      "COMPANY_CITY_STATE",
      "Tijuana, Baja California 22000, México",
    ),
    phone: envOr("COMPANY_PHONE", "(664) 000-0000"),
    email: envOr("COMPANY_EMAIL", "contacto@jorgecuadros.local"),
    taxId: envOr("COMPANY_TAX_ID", ""),
    website: envOr("COMPANY_WEBSITE", "jorgecuadros.local"),
    logoPath,
    logo,
  };
  return cached;
}