import type { Request, Response } from "express";
import { createClient } from "@supabase/supabase-js";

const RUNPOD_API_KEY = process.env.RUNPOD_API_KEY || "";
const RUNPOD_ENDPOINT_ID = process.env.RUNPOD_ENDPOINT_ID || "";
const SIGNALING_URL = process.env.SIGNALING_URL || "wss://signal.aethex.tech/ws";
const TURN_SERVER = process.env.TURN_SERVER || "turn://aethex:changeme-turn-password@turn.aethex.tech:3478";

const supabaseAdmin = createClient(
  process.env.SUPABASE_URL!,
  process.env.SUPABASE_SERVICE_ROLE!
);

async function getUserFromToken(token: string) {
  const { data: { user }, error } = await supabaseAdmin.auth.getUser(token);
  if (error || !user) return null;
  return user;
}

async function spawnJob(input: Record<string, string>) {
  if (!RUNPOD_ENDPOINT_ID) throw new Error("RUNPOD_ENDPOINT_ID not configured");
  const res = await fetch(`https://api.runpod.io/v2/${RUNPOD_ENDPOINT_ID}/run`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "Authorization": `Bearer ${RUNPOD_API_KEY}`,
    },
    body: JSON.stringify({ input }),
  });
  const data = await res.json() as any;
  if (!res.ok || data.error) throw new Error(data.error || `RunPod error ${res.status}`);
  return data as { id: string; status: string };
}

async function cancelJob(jobId: string) {
  if (!RUNPOD_ENDPOINT_ID) return;
  await fetch(`https://api.runpod.io/v2/${RUNPOD_ENDPOINT_ID}/cancel/${jobId}`, {
    method: "POST",
    headers: { "Authorization": `Bearer ${RUNPOD_API_KEY}` },
  });
}

// POST /api/stream/session/start
export async function startSession(req: Request, res: Response) {
  const token = req.headers.authorization?.replace("Bearer ", "");
  if (!token) return res.status(401).json({ error: "Unauthorized" });

  const user = await getUserFromToken(token);
  if (!user) return res.status(401).json({ error: "Invalid token" });

  const { mode = "game", game } = req.body as { mode?: string; game?: string };

  const { data: existing } = await supabaseAdmin
    .from("stream_sessions")
    .select("id, pod_id")
    .eq("user_id", user.id)
    .in("status", ["active", "starting"])
    .maybeSingle();

  if (existing) {
    return res.json({ sessionId: existing.id, jobId: existing.pod_id, alreadyActive: true });
  }

  if (mode === "devstation") {
    const { data: profile } = await supabaseAdmin
      .from("profiles")
      .select("role")
      .eq("id", user.id)
      .maybeSingle();
    if (!["developer", "admin", "oversee"].includes(profile?.role ?? "")) {
      return res.status(403).json({ error: "Dev station access requires developer role" });
    }
  }

  try {
    const job = await spawnJob({
      MODE: mode,
      SIGNALING_URL,
      TURN_SERVER,
      AETHEX_USER_ID: user.id,
      IDLE_TIMEOUT: "600",
      MAX_SESSION: "7200",
      ...(game ? { GAME: game } : {}),
    });

    console.log(`[stream] serverless job spawned: ${job.id} status=${job.status}`);

    const { data: session } = await supabaseAdmin
      .from("stream_sessions")
      .insert({
        user_id: user.id,
        pod_id: job.id,
        mode,
        game: game || null,
        status: "starting",
      })
      .select("id")
      .single();

    res.json({ sessionId: session!.id, jobId: job.id, status: "starting" });
  } catch (err: any) {
    console.error("[stream/start] error:", err.message);
    res.status(500).json({ error: err.message });
  }
}

// POST /api/stream/session/stop
export async function stopSession(req: Request, res: Response) {
  const token = req.headers.authorization?.replace("Bearer ", "");
  if (!token) return res.status(401).json({ error: "Unauthorized" });

  const user = await getUserFromToken(token);
  if (!user) return res.status(401).json({ error: "Invalid token" });

  const { data: session } = await supabaseAdmin
    .from("stream_sessions")
    .select("id, pod_id")
    .eq("user_id", user.id)
    .in("status", ["active", "starting"])
    .maybeSingle();

  if (!session) return res.json({ ok: true, message: "No active session" });

  await cancelJob(session.pod_id);

  await supabaseAdmin
    .from("stream_sessions")
    .update({ status: "stopped", ended_at: new Date().toISOString() })
    .eq("id", session.id);

  res.json({ ok: true });
}

// POST /api/stream/session/cpu — VP8 job for free users (same endpoint, FORCE_VP8=1)
export async function startCpuSession(req: Request, res: Response) {
  const token = req.headers.authorization?.replace("Bearer ", "");
  if (!token) return res.status(401).json({ error: "Unauthorized" });
  const user = await getUserFromToken(token);
  if (!user) return res.status(401).json({ error: "Invalid token" });

  const { data: existing } = await supabaseAdmin
    .from("stream_sessions")
    .select("id, pod_id")
    .eq("user_id", user.id)
    .in("status", ["active", "starting"])
    .maybeSingle();
  if (existing) return res.json({ sessionId: existing.id, jobId: existing.pod_id, alreadyActive: true });

  try {
    const job = await spawnJob({
      MODE: "game",
      SIGNALING_URL,
      TURN_SERVER,
      AETHEX_USER_ID: user.id,
      FORCE_VP8: "1",
      IDLE_TIMEOUT: "600",
      MAX_SESSION: "7200",
    });

    console.log(`[stream/cpu] serverless job spawned: ${job.id}`);

    const { data: session } = await supabaseAdmin
      .from("stream_sessions")
      .insert({ user_id: user.id, pod_id: job.id, mode: "game", status: "starting" })
      .select("id").single();

    res.json({ sessionId: session!.id, jobId: job.id, status: "starting" });
  } catch (err: any) {
    console.error("[stream/cpu] error:", err.message);
    res.status(500).json({ error: err.message });
  }
}

// GET /api/stream/online (public — no auth)
export async function onlineCount(_req: Request, res: Response) {
  const { count } = await supabaseAdmin
    .from("stream_sessions")
    .select("*", { count: "exact", head: true })
    .in("status", ["active", "starting"]);
  res.json({ count: count ?? 0 });
}

// GET /api/stream/session/status
export async function sessionStatus(req: Request, res: Response) {
  const token = req.headers.authorization?.replace("Bearer ", "");
  if (!token) return res.status(401).json({ error: "Unauthorized" });

  const user = await getUserFromToken(token);
  if (!user) return res.status(401).json({ error: "Invalid token" });

  const { data: session } = await supabaseAdmin
    .from("stream_sessions")
    .select("id, pod_id, mode, game, status, created_at")
    .eq("user_id", user.id)
    .order("created_at", { ascending: false })
    .limit(1)
    .maybeSingle();

  res.json({ session: session || null });
}