import { NextResponse } from "next/server";
import { auth } from "@/lib/auth";
import { prisma } from "@/lib/prisma";
import { EVENT_CONFIG, EventType } from "@/lib/event-config";
import { format } from "date-fns";
import { fr } from "date-fns/locale";

export async function GET(req: Request) {
  const session = await auth();
  if (!session?.user?.id) return NextResponse.json({ error: "Non autorisé" }, { status: 401 });

  const { searchParams } = new URL(req.url);
  const babyId = searchParams.get("babyId");
  const dateFrom = searchParams.get("dateFrom");
  const dateTo = searchParams.get("dateTo");
  const outputFormat = searchParams.get("format");

  if (!babyId) return NextResponse.json({ error: "babyId requis" }, { status: 400 });

  const familyId = (session.user as { familyId?: string }).familyId;
  if (!familyId) return NextResponse.json({ error: "Non autorisé" }, { status: 401 });
  const ownedBaby = await prisma.baby.findFirst({ where: { id: babyId, familyId } });
  if (!ownedBaby) return NextResponse.json({ error: "Bébé introuvable" }, { status: 404 });

  const where: Record<string, unknown> = { babyId };
  if (dateFrom || dateTo) {
    where.startedAt = {
      ...(dateFrom ? { gte: new Date(dateFrom) } : {}),
      ...(dateTo ? { lte: new Date(dateTo) } : {}),
    };
  }

  const events = await prisma.event.findMany({
    where,
    orderBy: { startedAt: "asc" },
    include: { user: { select: { name: true } } },
  });

  if (outputFormat === "json") {
    return NextResponse.json(events.map((e) => ({
      type: e.type,
      startedAt: e.startedAt,
      endedAt: e.endedAt,
      notes: e.notes,
      metadata: e.metadata,
      user: e.user.name,
    })));
  }

  const rows = [
    ["Date", "Heure", "Type", "Durée (min)", "Noté par", "Notes", "Détails"].join(","),
    ...events.map((e) => {
      const duration =
        e.endedAt
          ? Math.round((e.endedAt.getTime() - e.startedAt.getTime()) / 60000)
          : "";
      const details = e.metadata ? JSON.stringify(e.metadata).replace(/"/g, "'") : "";
      return [
        format(e.startedAt, "dd/MM/yyyy", { locale: fr }),
        format(e.startedAt, "HH:mm"),
        EVENT_CONFIG[e.type as EventType]?.label ?? e.type,
        duration,
        e.user.name,
        `"${(e.notes ?? "").replace(/"/g, "'")}"`,
        `"${details}"`,
      ].join(",");
    }),
  ].join("\n");

  return new NextResponse(rows, {
    headers: {
      "Content-Type": "text/csv; charset=utf-8",
      "Content-Disposition": `attachment; filename="grow-export-${format(new Date(), "yyyy-MM-dd")}.csv"`,
    },
  });
}