import { NextRequest, NextResponse } from "next/server";
import { jsonError, parseOptionalInt, parseTimestampRange } from "@/lib/api-params";
import { getTrends, type TrendGranularity } from "@/lib/queries";

const GRANULARITIES: TrendGranularity[] = ["hour", "day", "week", "month"];

export async function GET(req: NextRequest) {
  try {
    const sp = req.nextUrl.searchParams;
    const requestedGranularity = sp.get("granularity");
    const granularity = GRANULARITIES.includes(requestedGranularity as TrendGranularity)
      ? requestedGranularity as TrendGranularity
      : "day";
    const range = parseTimestampRange(sp);
    if (!range.ok) return jsonError(range.field);

    const channelId = parseOptionalInt(sp.get("channel_id"), "channel_id");
    if (!channelId.ok) return jsonError(channelId.field);
    if (channelId.value === 0) return jsonError("channel_id");

    const data = await getTrends(granularity, range.value.startTs, range.value.endTs, {
      username: sp.get("username") || undefined,
      model: sp.get("model") || undefined,
      channelId: channelId.value,
    });
    return NextResponse.json(data);
  } catch (error) {
    console.error("Failed to load trends", error);
    return jsonError(undefined, 500);
  }
}