import { NextResponse } from "next/server";
import { requireSessionUser } from "@/lib/server/session";
import { createBucket, listBuckets, requireActiveGroup } from "@/lib/server/buckets";
import { toErrorResponse } from "@/lib/server/errors";
import { getRequestMeta } from "@/lib/server/request";

function parseTags(value: unknown) {
    if (Array.isArray(value)) return value.map(tag => String(tag));
    if (typeof value === "string") return value.split(",");
    return [] as string[];
}

export async function GET() {
    const { requestId } = await getRequestMeta();
    try {
        const user = await requireSessionUser();
        const groupId = await requireActiveGroup(user.id);
        const buckets = await listBuckets(groupId);
        return NextResponse.json({ requestId, buckets });
    } catch (e) {
        const { status, body } = toErrorResponse(e, "GET /api/buckets", requestId);
        return NextResponse.json(body, { status });
    }
}

export async function POST(req: Request) {
    const { requestId } = await getRequestMeta();
    try {
        const user = await requireSessionUser();
        const groupId = await requireActiveGroup(user.id);
        const body = await req.json().catch(() => null);
        const name = String(body?.name || "").trim();
        const description = String(body?.description || "").trim();
        const iconKey = body?.iconKey ? String(body.iconKey) : null;
        const budgetLimitDollars = body?.budgetLimitDollars != null ? Number(body.budgetLimitDollars) : null;
        const position = body?.position != null ? Number(body.position) : 0;
        const tags = parseTags(body?.tags);
        const necessity = String(body?.necessity || "BOTH").toUpperCase();
        const windowDays = body?.windowDays != null ? Number(body.windowDays) : 30;

        if (!name) return NextResponse.json({ requestId, error: { code: "MISSING_NAME", message: "name is required" } }, { status: 400 });
        if (budgetLimitDollars != null && (!Number.isFinite(budgetLimitDollars) || budgetLimitDollars < 0))
            return NextResponse.json({ requestId, error: { code: "INVALID_BUDGET", message: "Invalid budgetLimitDollars" } }, { status: 400 });
        if (!['NECESSARY', 'BOTH', 'UNNECESSARY'].includes(necessity))
            return NextResponse.json({ requestId, error: { code: "INVALID_NECESSITY", message: "Invalid necessity" } }, { status: 400 });
        if (!Number.isFinite(windowDays) || windowDays < 1 || windowDays > 365)
            return NextResponse.json({ requestId, error: { code: "INVALID_WINDOW_DAYS", message: "Invalid windowDays" } }, { status: 400 });

        const bucket = await createBucket({
            groupId,
            userId: user.id,
            name,
            description: description || undefined,
            iconKey,
            budgetLimitDollars,
            position,
            tags,
            necessity: necessity as "NECESSARY" | "BOTH" | "UNNECESSARY",
            windowDays
        });

        return NextResponse.json({ requestId, bucket });
    } catch (e) {
        const { status, body } = toErrorResponse(e, "POST /api/buckets", requestId);
        return NextResponse.json(body, { status });
    }
}