import { NextRequest } from "next/server";
import { count, eq } from "drizzle-orm";
import { requireApiUser, jsonError, jsonOk } from "@/lib/api/auth-guard";
import { getDb } from "@/db/client";
import { sites, tagRecords } from "@/db/schema";
import { siteUpdateSchema } from "@/lib/validation/rfid";

type Ctx = { params: Promise<{ id: string }> };

export async function GET(request: NextRequest, context: Ctx) {
  const userOrRes = await requireApiUser(request);
  if (userOrRes instanceof Response) return userOrRes;

  const { id } = await context.params;
  const db = getDb();
  const site = db.select().from(sites).where(eq(sites.id, id)).get();
  if (!site) return jsonError(404, "NOT_FOUND", "Site not found");

  const tagCount =
    db
      .select({ c: count() })
      .from(tagRecords)
      .where(eq(tagRecords.siteId, id))
      .get()?.c ?? 0;

  return jsonOk({
    ...site,
    createdAt: site.createdAt.toISOString(),
    tagCount: Number(tagCount),
  });
}

export async function PATCH(request: NextRequest, context: Ctx) {
  const userOrRes = await requireApiUser(request);
  if (userOrRes instanceof Response) return userOrRes;

  const { id } = await context.params;
  let body: unknown;
  try {
    body = await request.json();
  } catch {
    return jsonError(400, "INVALID_JSON", "Request body must be JSON");
  }

  const parsed = siteUpdateSchema.safeParse(body);
  if (!parsed.success) {
    return jsonError(400, "VALIDATION_ERROR", parsed.error.message);
  }

  const db = getDb();
  const existing = db.select().from(sites).where(eq(sites.id, id)).get();
  if (!existing) return jsonError(404, "NOT_FOUND", "Site not found");

  const updates: Partial<typeof sites.$inferInsert> = {};
  if (parsed.data.name !== undefined) updates.name = parsed.data.name;
  if (parsed.data.code !== undefined) updates.code = parsed.data.code.toUpperCase();
  if (parsed.data.notes !== undefined) updates.notes = parsed.data.notes;

  if (updates.code && updates.code !== existing.code) {
    const clash = db
      .select()
      .from(sites)
      .where(eq(sites.code, updates.code))
      .get();
    if (clash) {
      return jsonError(409, "CONFLICT", `Site code ${updates.code} already exists`);
    }
  }

  db.update(sites).set(updates).where(eq(sites.id, id)).run();
  const updated = db.select().from(sites).where(eq(sites.id, id)).get()!;
  return jsonOk({
    ...updated,
    createdAt: updated.createdAt.toISOString(),
  });
}

export async function DELETE(request: NextRequest, context: Ctx) {
  const userOrRes = await requireApiUser(request);
  if (userOrRes instanceof Response) return userOrRes;

  const { id } = await context.params;
  const db = getDb();
  const existing = db.select().from(sites).where(eq(sites.id, id)).get();
  if (!existing) return jsonError(404, "NOT_FOUND", "Site not found");

  db.delete(sites).where(eq(sites.id, id)).run();
  return jsonOk({ ok: true });
}