import PDFDocument from "pdfkit";
import fs from "node:fs";
import path from "node:path";

const CCDS_LOGO_PATH = path.resolve(process.cwd(), "client/src/assets/ccds.png");

function drawLogo(doc: PDFKit.PDFDocument, x: number, y: number, width: number, height: number) {
  if (!fs.existsSync(CCDS_LOGO_PATH)) return;
  try {
    doc.image(CCDS_LOGO_PATH, x, y, { fit: [width, height], align: "center", valign: "center" });
  } catch (error) {
    console.warn("[SalleAdministrativeDecisionPdf] Impossible de charger le logo CCDS:", error);
  }
}

export async function generateSalleAdministrativeDecisionPdf(input: {
  requestId: number;
  decisionText: string;
  signedAt?: string | Date | null;
  signedByLabel?: string | null;
}) {
  const pdfBuffer = await new Promise<Buffer>((resolve, reject) => {
    try {
      const doc = new PDFDocument({
        size: "A4",
        margins: { top: 42, bottom: 42, left: 42, right: 42 },
      });
      const chunks: Buffer[] = [];
      doc.on("data", (chunk: Buffer) => chunks.push(chunk));
      doc.on("end", () => resolve(Buffer.concat(chunks)));
      doc.on("error", reject);

      const width = doc.page.width - doc.page.margins.left - doc.page.margins.right;
      let y = doc.page.margins.top;
      drawLogo(doc, doc.page.margins.left + (width - 90) / 2, y, 90, 90);
      y += 102;

      doc.font("Helvetica-Bold").fontSize(18).fillColor("#0f2d63").text(
        "DÉCISION ADMINISTRATIVE PRIORITAIRE",
        doc.page.margins.left,
        y,
        { width, align: "center" }
      );
      y += 22;
      doc.font("Helvetica").fontSize(10).fillColor("#475569").text(
        `Dossier salle #${input.requestId}`,
        doc.page.margins.left,
        y,
        { width, align: "center" }
      );
      y += 34;

      const bodyHeight = input.signedAt ? 360 : 420;
      doc.roundedRect(doc.page.margins.left, y, width, bodyHeight, 10).stroke("#cbd5e1");
      doc.font("Helvetica").fontSize(11).fillColor("#1f2937").text(
        input.decisionText,
        doc.page.margins.left + 18,
        y + 18,
        { width: width - 36, lineGap: 4 }
      );

      if (input.signedAt) {
        const signatureY = y + bodyHeight + 18;
        doc.roundedRect(doc.page.margins.left, signatureY, width, 62, 8).fillAndStroke("#eef6ff", "#93c5fd");
        doc.font("Helvetica-Bold").fontSize(11).fillColor("#1d4ed8").text(
          "Visa de la Direction",
          doc.page.margins.left + 16,
          signatureY + 12,
          { width: width - 32 }
        );
        doc.font("Helvetica").fontSize(10).fillColor("#1f2937").text(
          `Validation électronique le ${new Date(input.signedAt).toLocaleString("fr-FR")}${input.signedByLabel ? ` par ${input.signedByLabel}` : ""}.`,
          doc.page.margins.left + 16,
          signatureY + 32,
          { width: width - 32 }
        );
      }

      doc.end();
    } catch (error) {
      reject(error);
    }
  });

  return {
    buffer: pdfBuffer,
    fileName: `decision-administrative-salle-${input.requestId}.pdf`,
  };
}