// documents.js — file-store and PDF-saving helpers shared by ipc.js (desktop) and
// webserver.js (tablet/Mac web client), so both talk to the exact same document
// pipeline instead of two copies of it.
"use strict";

const fs = require("fs");
const path = require("path");
const crypto = require("crypto");

const db = require("./db");
const pdfRenderer = require("./pdf");

function filesDirFor(dataFolder, animalId) {
  const dir = path.join(dataFolder, "files", animalId);
  fs.mkdirSync(dir, { recursive: true });
  return dir;
}

function copyIntoStore(dataFolder, animalId, sourcePath) {
  const original = path.basename(sourcePath);
  const stored = `${crypto.randomUUID()}-${original}`;
  const destDir = filesDirFor(dataFolder, animalId);
  const destPath = path.join(destDir, stored);
  fs.copyFileSync(sourcePath, destPath);
  const size = fs.statSync(destPath).size;
  return { original, relativePath: path.join("files", animalId, stored), size, absPath: destPath };
}

function fileToDataUri(absPath) {
  try {
    const buf = fs.readFileSync(absPath);
    const ext = (path.extname(absPath).slice(1) || "png").replace("jpg", "jpeg");
    return `data:image/${ext};base64,${buf.toString("base64")}`;
  } catch {
    return null;
  }
}

function logoDataUri() {
  return fileToDataUri(path.join(__dirname, "..", "assets", "logo.png"));
}

// Renders a PDF and saves it into the animal's document store, registering it as a
// normal document row so it shows up in the Dokumente tab like any uploaded file.
async function savePdfAsDocument(dataFolder, animalId, filenamePrefix, pdfOptions) {
  const buffer = await pdfRenderer.renderPdf({ logoDataUri: logoDataUri(), ...pdfOptions });
  const bundle = db.getAnimalBundle(animalId);
  const safeName = bundle.animal.name.replace(/[^a-z0-9äöüß]+/gi, "_");
  const filename = `${filenamePrefix}_${safeName}_${new Date().toISOString().slice(0, 10)}_${Date.now()}.pdf`;
  const dir = filesDirFor(dataFolder, animalId);
  const absPath = path.join(dir, filename);
  fs.writeFileSync(absPath, buffer);
  const relativePath = path.join("files", animalId, filename);
  const docId = db.addDocumentRow(animalId, "document", filename, relativePath, buffer.length);
  return { docId, absPath, relativePath, filename };
}

module.exports = { filesDirFor, copyIntoStore, fileToDataUri, logoDataUri, savePdfAsDocument };