SOLAR QUOTATION

import jsPDF from "jspdf";
import { logoDataURI } from "@/assets/logo";

interface QuoteData {
  customer: { name: string; address: string; phone: string };
  system: { kw: number; panels: number; batteryKwh: number };
  pricing: { total: number; deposit: number; installments: number };
  quoteNo: string;
  date: string;
}

export function buildQuotePdf(q: QuoteData): Blob {
  const pdf = new jsPDF({ unit: "pt", format: "a4" });

  // Header with logo
  pdf.addImage(logoDataURI, "PNG", 40, 30, 80, 80);
  pdf.setFontSize(22).text("Solar Quotation", 140, 60);
  pdf.setFontSize(10).text(`Quote #${q.quoteNo} · ${q.date}`, 140, 80);

  // Customer block
  pdf.setFontSize(11);
  pdf.text(`Customer: ${q.customer.name}`, 40, 140);
  pdf.text(`Address:  ${q.customer.address}`, 40, 156);
  pdf.text(`Phone:    ${q.customer.phone}`, 40, 172);

  // System block
  pdf.setFontSize(13).text("System Specification", 40, 220);
  pdf.setFontSize(11);
  pdf.text(`Capacity:        ${q.system.kw} kW`, 40, 244);
  pdf.text(`Panels:          ${q.system.panels}`, 40, 260);
  pdf.text(`Battery storage: ${q.system.batteryKwh} kWh`, 40, 276);

  // Pricing
  pdf.setFontSize(13).text("Investment", 40, 324);
  pdf.setFontSize(11);
  pdf.text(`Total:        PKR ${q.pricing.total.toLocaleString()}`, 40, 348);
  pdf.text(`Deposit:      PKR ${q.pricing.deposit.toLocaleString()}`, 40, 364);
  pdf.text(`Installments: ${q.pricing.installments} months`, 40, 380);

  return pdf.output("blob");
}

const SALT = "solar-quote-pwa-v1";

async function hash(pin: string): Promise<string> {
  const enc = new TextEncoder().encode(SALT + pin);
  const buf = await crypto.subtle.digest("SHA-256", enc);
  return Array.from(new Uint8Array(buf))
    .map((b) => b.toString(16).padStart(2, "0"))
    .join("");
}

export async function setPin(pin: string) {
  if (!/^\d{4}$/.test(pin)) throw new Error("PIN must be 4 digits");
  localStorage.setItem("pin_hash", await hash(pin));
}

export async function verifyPin(pin: string): Promise<boolean> {
  const stored = localStorage.getItem("pin_hash");
  if (!stored) return false;
  return (await hash(pin)) === stored;
}