import PDFDocument from "pdfkit";
import fs from "node:fs";
import path from "node:path";
import type { MaterialContractFinancialMode, MaterialContractStatus } from "./materialConventionPdf";

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

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

type ContractAssociationLike = {
  nomAssociation?: string | null;
  adresse?: string | null;
  codePostal?: string | null;
  ville?: string | null;
  telephone?: string | null;
  emailContact?: string | null;
  nomRepresentant?: string | null;
} | null | undefined;

type ContractDecision = {
  financialMode: MaterialContractFinancialMode;
  depositRequired: boolean;
  depositAmountCents: number;
  rentalAmountCents: number;
  pricingNotes?: string | null;
  contractStatus: MaterialContractStatus;
  contractGeneratedAt?: string | Date | null;
  contractValidatedByUserId?: number | null;
};

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("[SalleConventionPdf] 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 formatCurrency(cents: number | null | undefined) {
  return new Intl.NumberFormat("fr-FR", { style: "currency", currency: "EUR" }).format((cents || 0) / 100);
}

function getFinancialModeLabel(mode: MaterialContractFinancialMode) {
  switch (mode) {
    case "gratuite":
      return "Mise à disposition gratuite";
    case "gratuite_avec_caution":
      return "Mise à disposition gratuite avec caution";
    case "location_payante":
      return "Location payante";
    default:
      return mode;
  }
}

function getScheduleSummary(formData: any) {
  const dailySlots = Array.isArray(formData?.horairesParJour)
    ? formData.horairesParJour.filter((slot: any) => slot?.date)
    : [];

  if (Boolean(formData?.useDetailedSchedule) && dailySlots.length > 0) {
    return dailySlots
      .map((slot: any) => `${formatDateFr(slot.date)} : ${slot.heureDebut || "?"} - ${slot.heureFin || "?"}`)
      .join(" | ");
  }

  if (formData?.heureDebut || formData?.heureFin) {
    return `${formData.heureDebut || "?"} - ${formData.heureFin || "?"}`;
  }

  return "-";
}

export async function generateSalleConventionPdf(input: {
  request: ContractRequestLike;
  association?: ContractAssociationLike;
  decision: ContractDecision;
}) {
  const formData = (() => {
    try {
      return input.request.formData ? JSON.parse(input.request.formData) : {};
    } catch {
      return {};
    }
  })();

  const sallesSelectionnees = Array.isArray(formData.sallesSelectionnees) && formData.sallesSelectionnees.length > 0
    ? formData.sallesSelectionnees.join(", ")
    : "-";

  const reservationStart = formData.dateReservation;
  const reservationEnd = formData.dateFinReservation || formData.dateReservation;
  const scheduleSummary = getScheduleSummary(formData);

  const pdfBuffer = await new Promise<Buffer>((resolve, reject) => {
    try {
      const doc = new PDFDocument({
        size: "A4",
        margins: { top: 38, bottom: 42, left: 42, right: 42 },
        info: {
          Title: `Convention salle CCDS - dossier ${input.request.id}`,
          Author: "Communauté de Communes Des Savanes",
          Subject: "Convention de mise à disposition / location d'un local CCDS",
        },
      });

      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.lineWidth(2).strokeColor("#efb100").moveTo(doc.page.margins.left, y).lineTo(doc.page.margins.left + pageWidth, y).stroke();
      y += 16;
      drawLogo(doc, doc.page.margins.left + (pageWidth - 84) / 2, y, 84, 84);
      y += 92;

      doc.font("Helvetica").fontSize(9).fillColor("#64748b").text("COMMUNAUTÉ DE COMMUNES DES SAVANES", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 18;
      doc.font("Helvetica-Bold").fontSize(17).fillColor("#0f172a").text(
        "CONVENTION DE MISE À DISPOSITION / LOCATION",
        doc.page.margins.left,
        y,
        { width: pageWidth, align: "center" }
      );
      y += 20;
      doc.font("Helvetica-Bold").fontSize(14).text("D'UN LOCAL - MAISON DE LA JEUNESSE DES SAVANES", doc.page.margins.left, y, {
        width: pageWidth,
        align: "center",
      });
      y += 28;

      doc.roundedRect(doc.page.margins.left, y, pageWidth, 42, 8).fillAndStroke("#eef5ff", "#bfd2ef");
      doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f2d63").text(
        "Document généré à partir de la décision administrative CCDS",
        doc.page.margins.left + 14,
        y + 9,
        { width: pageWidth - 28, align: "center" }
      );
      doc.font("Helvetica").fontSize(9).fillColor("#334155").text(
        `Dossier #${input.request.id} — statut contrat : ${input.decision.contractStatus}`,
        doc.page.margins.left + 14,
        y + 23,
        { width: pageWidth - 28, align: "center" }
      );
      y += 56;

      const infoRows: Array<[string, string]> = [
        ["Association", input.association?.nomAssociation || formData.nomAssociation || "-"],
        ["Représentant", input.association?.nomRepresentant || formData.representantLegal || "-"],
        ["Adresse", [input.association?.adresse, input.association?.codePostal, input.association?.ville].filter(Boolean).join(" ") || "-"],
        ["Téléphone", input.association?.telephone || formData.telephoneAssociation || "-"],
        ["Email", input.association?.emailContact || formData.emailAssociation || "-"],
        ["Local réservé", sallesSelectionnees],
        [
          "Période d'utilisation",
          reservationStart || reservationEnd
            ? `${formatDateFr(reservationStart)}${reservationEnd ? ` au ${formatDateFr(reservationEnd)}` : ""}`
            : "-",
        ],
        ["Créneau / horaires", scheduleSummary],
        ["Objet", formData.motifReservation || input.request.titre || "-"],
      ];

      for (const [label, value] of infoRows) {
        doc.font("Helvetica-Bold").fontSize(9).fillColor("#334155").text(`${label} :`, doc.page.margins.left, y, { width: 140 });
        doc.font("Helvetica").fontSize(10).fillColor("#0f172a").text(value, doc.page.margins.left + 145, y - 1, {
          width: pageWidth - 145,
        });
        y += 18;
      }

      y += 10;
      doc.roundedRect(doc.page.margins.left, y, pageWidth, 108, 8).fillAndStroke("#f8fafc", "#cbd5e1");
      doc.font("Helvetica-Bold").fontSize(11).fillColor("#0f172a").text("Conditions financières", doc.page.margins.left + 14, y + 12);
      doc.font("Helvetica").fontSize(10).fillColor("#334155")
        .text(`Régime retenu : ${getFinancialModeLabel(input.decision.financialMode)}`, doc.page.margins.left + 14, y + 34, {
          width: pageWidth - 28,
        })
        .text(`Montant de location : ${formatCurrency(input.decision.rentalAmountCents)}`, doc.page.margins.left + 14, y + 52, {
          width: pageWidth - 28,
        })
        .text(
          `Caution : ${input.decision.depositRequired ? formatCurrency(input.decision.depositAmountCents) : "Aucune caution exigée"}`,
          doc.page.margins.left + 14,
          y + 70,
          { width: pageWidth - 28 }
        );
      y += 122;

      if (input.decision.pricingNotes?.trim()) {
        doc.font("Helvetica-Bold").fontSize(11).fillColor("#0f172a").text("Clauses / réserves spécifiques", doc.page.margins.left, y);
        y += 16;
        doc.roundedRect(doc.page.margins.left, y, pageWidth, 70, 8).stroke("#cbd5e1");
        doc.font("Helvetica").fontSize(10).fillColor("#334155").text(input.decision.pricingNotes.trim(), doc.page.margins.left + 12, y + 12, {
          width: pageWidth - 24,
        });
        y += 84;
      }

      y += 8;
      doc.font("Helvetica").fontSize(9).fillColor("#475569").text(
        "Cette convention formalise les conditions administratives retenues par la CCDS pour la mise à disposition ou la location du local sollicité.",
        doc.page.margins.left,
        y,
        { width: pageWidth }
      );
      y += 36;

      const signatureWidth = (pageWidth - 16) / 2;
      doc.roundedRect(doc.page.margins.left, y, signatureWidth, 84, 8).stroke("#cbd5e1");
      doc.roundedRect(doc.page.margins.left + signatureWidth + 16, y, signatureWidth, 84, 8).stroke("#cbd5e1");
      doc.font("Helvetica-Bold").fontSize(10).fillColor("#0f172a")
        .text("Association emprunteuse", doc.page.margins.left + 12, y + 12, { width: signatureWidth - 24, align: "center" })
        .text("CCDS / DSU", doc.page.margins.left + signatureWidth + 28, y + 12, { width: signatureWidth - 24, align: "center" });
      doc.font("Helvetica").fontSize(9).fillColor("#64748b")
        .text("Nom, qualité et signature", doc.page.margins.left + 12, y + 56, { width: signatureWidth - 24, align: "center" })
        .text("Visa administratif", doc.page.margins.left + signatureWidth + 28, y + 56, { width: signatureWidth - 24, align: "center" });

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

  return {
    buffer: pdfBuffer,
    fileName: `convention-salle-ccds-${input.request.id}.pdf`,
  };
}