import { NextResponse } from "next/server";
import { auth } from "@/lib/auth";
import { fetchUserStats, refreshAccessToken } from "@/lib/tiktok";
import { prisma } from "@/lib/prisma";

export async function GET() {
    const session = await auth();

    if (!session?.user) {
        return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const userId = (session.user as { id?: string }).id;
    if (!userId) {
        return NextResponse.json({ error: "Session error" }, { status: 401 });
    }

    const tokenRecord = await prisma.tikTokToken.findUnique({ where: { userId } });

    if (!tokenRecord) {
        return NextResponse.json({ error: "Not connected" }, { status: 404 });
    }

    let { accessToken, refreshToken, openId, expiresAt } = tokenRecord;

    // Refresh si expiré (avec 60s de marge)
    if (expiresAt.getTime() - Date.now() < 60_000) {
        try {
            const refreshed = await refreshAccessToken(refreshToken);
            const newExpiresAt = new Date(Date.now() + refreshed.expires_in * 1000);

            await prisma.tikTokToken.update({
                where: { userId },
                data: {
                    accessToken: refreshed.access_token,
                    refreshToken: refreshed.refresh_token,
                    expiresAt: newExpiresAt,
                },
            });

            accessToken = refreshed.access_token;
            refreshToken = refreshed.refresh_token;
            expiresAt = newExpiresAt;
        } catch (err) {
            console.error("[TikTok stats refresh error]", err);
            return NextResponse.json({ error: "Token refresh failed" }, { status: 401 });
        }
    }

    try {
        const stats = await fetchUserStats(accessToken, openId);
        return NextResponse.json(stats);
    } catch (err) {
        console.error("[TikTok stats fetch error]", err);
        return NextResponse.json({ error: "Failed to fetch stats" }, { status: 500 });
    }
}