import { NextResponse } from "next/server";
import { randomBytes, createHash } from "crypto";
import { auth } from "@/auth";
import { prisma } from "@/lib/prisma";

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

    const keys = await prisma.apiKey.findMany({
      where: { userId: session.user.id, revoked: false },
      select: {
        id: true,
        name: true,
        keyPrefix: true,
        createdAt: true,
        lastUsedAt: true,
      },
      orderBy: { createdAt: "desc" },
    });

    return NextResponse.json(keys, { status: 200 });
  } catch (error) {
    console.error("Error listing API keys:", error);
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}

export async function POST(request: Request) {
  try {
    const session = await auth();
    if (!session?.user?.id)
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });

    const MAX_KEYS_PER_USER = 10;
    const keyCount = await prisma.apiKey.count({
      where: { userId: session.user.id, revoked: false },
    });
    if (keyCount >= MAX_KEYS_PER_USER) {
      return NextResponse.json(
        { error: `Maximum of ${MAX_KEYS_PER_USER} API keys allowed. Revoke an existing key first.` },
        { status: 400 }
      );
    }

    const body = await request.json().catch(() => ({}));
    const name =
      typeof body.name === "string" && body.name.trim()
        ? body.name.trim()
        : "Default";

    const rawHex = randomBytes(24).toString("hex");
    const fullKey = `al_${rawHex}`;
    const keyPrefix = fullKey.slice(0, 10);
    const keyHash = createHash("sha256").update(fullKey).digest("hex");

    const apiKey = await prisma.apiKey.create({
      data: {
        userId: session.user.id,
        name,
        keyHash,
        keyPrefix,
      },
      select: {
        id: true,
        name: true,
        keyPrefix: true,
        createdAt: true,
      },
    });

    return NextResponse.json(
      { ...apiKey, key: fullKey },
      { status: 201 }
    );
  } catch (error) {
    console.error("Error creating API key:", error);
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}
