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

type MaterialReturnRequest = {
  id: number;
  titre: string;
  formData?: string | null;
};

type MaterialReturnAssociation = {
  nomAssociation?: string | null;
  telephone?: string | null;
  emailContact?: string | null;
  ville?: string | null;
} | null | undefined;

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("[MaterialReturnPdf] Impossible de charger le logo CCDS:", error);
  }
}

function formatDateFr(date: string | Date | null | undefined) {
  if (!date) return "";
  try {
    return new Date(date).toLocaleDateString("fr-FR", {
      day: "2-digit",
      month: "2-digit",
      year: "numeric",
    });
  } catch {
    return String(date);
  }
}

function addLabeledValue(doc: PDFKit.PDFDocument, label: string, value: string, x: number, y: number, width: number) {
  doc.font("Helvetica-Bold").fontSize(9).fillColor("#334155").text(label, x, y, { width });
  doc.font("Helvetica").fontSize(10).fillColor("#0f172a").text(value || "........................................................", x, y + 12, { width });
}

function addSignatureBlock(doc: PDFKit.PDFDocument, title: string, x: number, y: number, width: number) {
  doc.roundedRect(x, y, width, 90, 8).stroke("#cbd5e1");
  doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f172a").text(title, x + 12, y + 12, { width: width - 24 });
  doc.font("Helvetica").fontSize(9).fillColor("#64748b").text("Nom, qualité, signature et date", x + 12, y + 32, { width: width - 24 });
}

export async function generateMaterialReturnStatementPdf(input: {
  request: MaterialReturnRequest;
  association?: MaterialReturnAssociation;
}) {
  const formData = (() => {
    try {
      return input.request.formData ? JSON.parse(input.request.formData) : {};
    } catch {
      return {};
    }
  })();

  const manifestationStart = formData.dateDebutManifestation || formData.dateManifestation;
  const manifestationEnd = formData.dateFinManifestation || formData.dateManifestation;
  const requestedItems = Object.entries(formData.materielsDemandes || {})
    .filter(([, checked]) => Boolean(checked))
    .map(([key]) => ({
      key,
      label:
        key === "tente3x3"
          ? "Tente 3x3"
          : key === "chapiteau5x5"
            ? "Chapiteau 5x5"
            : key === "podium"
              ? "Podium"
              : "Autres",
      quantity: formData.quantitesDemandees?.[key] || "-",
      extra: key === "autres" ? formData.autreMaterielPrecisions || "" : "",
    }));

  const pdfBuffer = await new Promise<Buffer>((resolve, reject) => {
    try {
      const doc = new PDFDocument({
        size: "A4",
        margins: { top: 36, bottom: 40, left: 42, right: 42 },
        info: {
          Title: `Fiche d'état des lieux - Demande ${input.request.id}`,
          Author: "Communauté de Communes Des Savanes",
          Subject: "Fiche d'état des lieux du matériel événementiel",
        },
      });

      const chunks: Buffer[] = [];
      doc.on("data", (chunk: Buffer) => chunks.push(chunk));
      doc.on("end", () => resolve(Buffer.concat(chunks)));
      doc.on("error", reject);

      const pageWidth = doc.page.width - doc.page.margins.left - doc.page.margins.right;
      let y = doc.page.margins.top;

      doc.moveTo(doc.page.margins.left, y).lineTo(doc.page.margins.left + pageWidth, y).lineWidth(2).stroke("#efb100");
      y += 14;
      drawLogo(doc, doc.page.margins.left + (pageWidth - 76) / 2, y, 76, 76);
      y += 82;

      doc.font("Helvetica").fontSize(9).fillColor("#64748b").text("COMMUNAUTÉ DE COMMUNES DES SAVANES", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 16;
      doc.font("Helvetica-Bold").fontSize(18).fillColor("#0f172a").text("FICHE D'ÉTAT DES LIEUX", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 18;
      doc.font("Helvetica-Bold").fontSize(14).text("DU MATÉRIEL ÉVÉNEMENTIEL DE LA CCDS", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 22;

      doc.roundedRect(doc.page.margins.left, y, pageWidth, 34, 8).fillAndStroke("#eef5ff", "#bfd2ef");
      doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f2d63").text("Document de suivi prérempli à compléter contradictoirement", doc.page.margins.left + 14, y + 9, {
        width: pageWidth - 28,
        align: "center",
      });
      y += 48;

      const leftColWidth = (pageWidth - 16) / 2;
      addLabeledValue(doc, "Commune", formData.commune || input.association?.ville || "", doc.page.margins.left, y, leftColWidth);
      addLabeledValue(doc, "Demandeur", formData.demandeurNomPrenom || input.association?.nomAssociation || "", doc.page.margins.left + leftColWidth + 16, y, leftColWidth);
      y += 40;
      addLabeledValue(doc, "Téléphone", formData.telephoneAssociation || input.association?.telephone || "", doc.page.margins.left, y, leftColWidth);
      addLabeledValue(doc, "Intitulé de la manifestation", formData.motifDemande || input.request.titre || "", doc.page.margins.left + leftColWidth + 16, y, leftColWidth);
      y += 40;
      addLabeledValue(
        doc,
        "Date prévue du / au",
        manifestationStart || manifestationEnd
          ? `${formatDateFr(manifestationStart)}${manifestationEnd ? ` au ${formatDateFr(manifestationEnd)}` : ""}`
          : "",
        doc.page.margins.left,
        y,
        leftColWidth
      );
      addLabeledValue(doc, "Date de restitution prévue", formatDateFr(formData.dateRestitution), doc.page.margins.left + leftColWidth + 16, y, leftColWidth);
      y += 48;

      doc.font("Helvetica-Bold").fontSize(11).fillColor("#0f172a").text("Matériel concerné", doc.page.margins.left, y);
      y += 14;

      const tableX = doc.page.margins.left;
      const cols = [pageWidth * 0.46, pageWidth * 0.16, pageWidth * 0.19, pageWidth * 0.19];
      const headers = ["Équipement", "Qté", "Mise à disposition", "Restitution"];
      let cursorX = tableX;
      headers.forEach((header, index) => {
        doc.rect(cursorX, y, cols[index], 22).fillAndStroke("#dce8f8", "#bfd2ef");
        doc.font("Helvetica-Bold").fontSize(9).fillColor("#0f2d63").text(header, cursorX + 6, y + 7, {
          width: cols[index] - 12,
          align: index === 0 ? "left" : "center",
        });
        cursorX += cols[index];
      });
      y += 22;

      const items = requestedItems.length > 0 ? requestedItems : [{ key: "none", label: "Aucun matériel renseigné", quantity: "-", extra: "" }];
      items.forEach((item) => {
        const rowHeight = item.extra ? 36 : 28;
        let rowX = tableX;
        const values = [
          item.extra ? `${item.label} — ${item.extra}` : item.label,
          item.quantity,
          "À compléter",
          "À compléter",
        ];

        values.forEach((value, index) => {
          doc.rect(rowX, y, cols[index], rowHeight).stroke("#cbd5e1");
          doc.font(index < 2 ? "Helvetica" : "Helvetica-Oblique")
            .fontSize(9)
            .fillColor(index < 2 ? "#0f172a" : "#64748b")
            .text(value, rowX + 6, y + 8, {
              width: cols[index] - 12,
              align: index === 0 ? "left" : "center",
            });
          rowX += cols[index];
        });
        y += rowHeight;
      });

      y += 20;
      doc.roundedRect(doc.page.margins.left, y, pageWidth, 76, 8).stroke("#cbd5e1");
      doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f172a").text("Observations contradictoires", doc.page.margins.left + 12, y + 12);
      doc.font("Helvetica").fontSize(9).fillColor("#64748b").text("Préciser l'état général du matériel, les éventuelles anomalies, manques ou réserves constatées.", doc.page.margins.left + 12, y + 28, {
        width: pageWidth - 24,
      });
      y += 92;

      addSignatureBlock(doc, "L'agent CCDS / service récupérateur", doc.page.margins.left, y, (pageWidth - 20) / 2);
      addSignatureBlock(doc, "L'emprunteur / représentant de l'association", doc.page.margins.left + (pageWidth - 20) / 2 + 20, y, (pageWidth - 20) / 2);
      y += 104;

      doc.font("Helvetica").fontSize(8).fillColor("#64748b").text(
        `Document préparé automatiquement pour la demande #${input.request.id} — à vérifier et compléter sur site lors de la restitution.`,
        doc.page.margins.left,
        y,
        { width: pageWidth, align: "center" }
      );

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

  return {
    buffer: pdfBuffer,
    fileName: `Fiche_Etat_Des_Lieux_${input.request.id}.pdf`,
  };
}

export async function generateCompletedMaterialReturnStatementPdf(input: {
  request: MaterialReturnRequest;
  association?: MaterialReturnAssociation;
  completion: {
    compliance: "conforme" | "non_conforme";
    discrepancyLabels: string[];
    discrepancyDetails?: string | null;
    agentName: string;
    agentRole: string;
    borrowerName: string;
    borrowerRole: string;
    validatedAt: Date;
    geoLatitude?: string | null;
    geoLongitude?: string | null;
    geoStatus?: string | null;
    geoFailureReason?: string | null;
    locationReference?: string | null;
    agentSignatureBuffer?: Buffer;
    borrowerSignatureBuffer?: Buffer;
  };
}) {
  const formData = (() => {
    try {
      return input.request.formData ? JSON.parse(input.request.formData) : {};
    } catch {
      return {};
    }
  })();

  const manifestationStart = formData.dateDebutManifestation || formData.dateManifestation;
  const manifestationEnd = formData.dateFinManifestation || formData.dateManifestation;
  const requestedItems = Object.entries(formData.materielsDemandes || {})
    .filter(([, checked]) => Boolean(checked))
    .map(([key]) => ({
      key,
      label:
        key === "tente3x3"
          ? "Tente 3x3"
          : key === "chapiteau5x5"
            ? "Chapiteau 5x5"
            : key === "podium"
              ? "Podium"
              : "Autres",
      quantity: formData.quantitesDemandees?.[key] || "-",
      extra: key === "autres" ? formData.autreMaterielPrecisions || "" : "",
    }));

  const pdfBuffer = await new Promise<Buffer>((resolve, reject) => {
    try {
      const doc = new PDFDocument({
        size: "A4",
        margins: { top: 36, bottom: 40, left: 42, right: 42 },
        info: {
          Title: `Fiche d'état des lieux finalisée - Demande ${input.request.id}`,
          Author: "Communauté de Communes Des Savanes",
          Subject: "Fiche d'état des lieux contradictoire du matériel événementiel",
        },
      });

      const chunks: Buffer[] = [];
      doc.on("data", (chunk: Buffer) => chunks.push(chunk));
      doc.on("end", () => resolve(Buffer.concat(chunks)));
      doc.on("error", reject);

      const pageWidth = doc.page.width - doc.page.margins.left - doc.page.margins.right;
      let y = doc.page.margins.top;

      doc.moveTo(doc.page.margins.left, y).lineTo(doc.page.margins.left + pageWidth, y).lineWidth(2).stroke("#efb100");
      y += 14;
      drawLogo(doc, doc.page.margins.left + (pageWidth - 76) / 2, y, 76, 76);
      y += 82;

      doc.font("Helvetica").fontSize(9).fillColor("#64748b").text("COMMUNAUTÉ DE COMMUNES DES SAVANES", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 16;
      doc.font("Helvetica-Bold").fontSize(18).fillColor("#0f172a").text("FICHE D'ÉTAT DES LIEUX FINALISÉE", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 18;
      doc.font("Helvetica-Bold").fontSize(14).text("DU MATÉRIEL ÉVÉNEMENTIEL DE LA CCDS", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 22;

      doc.roundedRect(doc.page.margins.left, y, pageWidth, 44, 8).fillAndStroke(
        input.completion.compliance === "conforme" ? "#ecfdf3" : "#fff7ed",
        input.completion.compliance === "conforme" ? "#a7f3d0" : "#fdba74"
      );
      doc.font("Helvetica-Bold").fontSize(11).fillColor(input.completion.compliance === "conforme" ? "#166534" : "#9a3412").text(
        input.completion.compliance === "conforme" ? "Restitution conforme" : "Restitution non conforme / partielle",
        doc.page.margins.left + 14,
        y + 10,
        { width: pageWidth - 28, align: "center" }
      );
      doc.font("Helvetica").fontSize(9).fillColor("#475569").text(
        `Validée le ${formatDateFr(input.completion.validatedAt)}`,
        doc.page.margins.left + 14,
        y + 25,
        { width: pageWidth - 28, align: "center" }
      );
      y += 58;

      const leftColWidth = (pageWidth - 16) / 2;
      addLabeledValue(doc, "Commune", formData.commune || input.association?.ville || "", doc.page.margins.left, y, leftColWidth);
      addLabeledValue(doc, "Association / demandeur", input.association?.nomAssociation || formData.demandeurNomPrenom || "", doc.page.margins.left + leftColWidth + 16, y, leftColWidth);
      y += 40;
      addLabeledValue(doc, "Téléphone", formData.telephoneAssociation || input.association?.telephone || "", doc.page.margins.left, y, leftColWidth);
      addLabeledValue(doc, "Manifestation", formData.motifDemande || input.request.titre || "", doc.page.margins.left + leftColWidth + 16, y, leftColWidth);
      y += 40;
      addLabeledValue(
        doc,
        "Période",
        manifestationStart || manifestationEnd
          ? `${formatDateFr(manifestationStart)}${manifestationEnd ? ` au ${formatDateFr(manifestationEnd)}` : ""}`
          : "",
        doc.page.margins.left,
        y,
        leftColWidth
      );
      addLabeledValue(doc, "Restitution prévue", formatDateFr(formData.dateRestitution), doc.page.margins.left + leftColWidth + 16, y, leftColWidth);
      y += 48;

      doc.font("Helvetica-Bold").fontSize(11).fillColor("#0f172a").text("Matériel restitué", doc.page.margins.left, y);
      y += 14;
      requestedItems.forEach((item) => {
        doc.rect(doc.page.margins.left, y, pageWidth, 24).stroke("#cbd5e1");
        doc.font("Helvetica").fontSize(9).fillColor("#0f172a").text(
          `${item.label}${item.extra ? ` — ${item.extra}` : ""}`,
          doc.page.margins.left + 8,
          y + 7,
          { width: pageWidth * 0.65 }
        );
        doc.font("Helvetica-Bold").fontSize(9).text(
          `Qté : ${item.quantity}`,
          doc.page.margins.left + pageWidth - 120,
          y + 7,
          { width: 110, align: "right" }
        );
        y += 24;
      });

      y += 16;
      doc.roundedRect(doc.page.margins.left, y, pageWidth, 100, 8).stroke("#cbd5e1");
      doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f172a").text("Observations contradictoires", doc.page.margins.left + 12, y + 12);
      doc.font("Helvetica").fontSize(9).fillColor("#475569").text(
        input.completion.discrepancyLabels.length > 0
          ? input.completion.discrepancyLabels.join(" • ")
          : "Aucune réserve relevée.",
        doc.page.margins.left + 12,
        y + 30,
        { width: pageWidth - 24 }
      );
      doc.text(
        input.completion.discrepancyDetails || "Aucune précision complémentaire.",
        doc.page.margins.left + 12,
        y + 50,
        { width: pageWidth - 24 }
      );
      y += 118;

      const geoLine = input.completion.geoLatitude && input.completion.geoLongitude
        ? `Géolocalisation : ${input.completion.geoLatitude}, ${input.completion.geoLongitude}`
        : input.completion.locationReference
          ? `Référence de lieu : ${input.completion.locationReference}${
              input.completion.geoFailureReason ? ` • GPS indisponible (${input.completion.geoFailureReason})` : ""
            }`
          : input.completion.geoFailureReason
            ? `GPS indisponible (${input.completion.geoFailureReason})`
            : "";

      doc.font("Helvetica").fontSize(8).fillColor("#64748b").text(
        `Horodatage serveur : ${new Date(input.completion.validatedAt).toLocaleString("fr-FR")}${geoLine ? ` • ${geoLine}` : ""}`,
        doc.page.margins.left,
        y,
        { width: pageWidth }
      );
      y += 18;

      const signatureWidth = (pageWidth - 20) / 2;
      doc.roundedRect(doc.page.margins.left, y, signatureWidth, 126, 8).stroke("#cbd5e1");
      doc.roundedRect(doc.page.margins.left + signatureWidth + 20, y, signatureWidth, 126, 8).stroke("#cbd5e1");

      doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f172a").text("Agent CCDS / service récupérateur", doc.page.margins.left + 12, y + 12, {
        width: signatureWidth - 24,
      });
      doc.font("Helvetica").fontSize(9).fillColor("#475569").text(
        `${input.completion.agentName}\n${input.completion.agentRole}`,
        doc.page.margins.left + 12,
        y + 30,
        { width: signatureWidth - 24 }
      );
      if (input.completion.agentSignatureBuffer) {
        doc.image(input.completion.agentSignatureBuffer, doc.page.margins.left + 12, y + 64, {
          fit: [signatureWidth - 24, 42],
          align: "center",
          valign: "center",
        });
      }

      doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f172a").text("Emprunteur / représentant", doc.page.margins.left + signatureWidth + 32, y + 12, {
        width: signatureWidth - 24,
      });
      doc.font("Helvetica").fontSize(9).fillColor("#475569").text(
        `${input.completion.borrowerName}\n${input.completion.borrowerRole}`,
        doc.page.margins.left + signatureWidth + 32,
        y + 30,
        { width: signatureWidth - 24 }
      );
      if (input.completion.borrowerSignatureBuffer) {
        doc.image(input.completion.borrowerSignatureBuffer, doc.page.margins.left + signatureWidth + 32, y + 64, {
          fit: [signatureWidth - 24, 42],
          align: "center",
          valign: "center",
        });
      }

      y += 138;
      doc.font("Helvetica").fontSize(8).fillColor("#64748b").text(
        `Document finalisé automatiquement pour la demande #${input.request.id}.`,
        doc.page.margins.left,
        y,
        { width: pageWidth, align: "center" }
      );

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

  return {
    buffer: pdfBuffer,
    fileName: `Fiche_Etat_Des_Lieux_Finalisee_${input.request.id}.pdf`,
  };
}