import { desc, eq } from "drizzle-orm";
import { db } from "@/lib/db/client";
import { recordings, sessionDevices, devices, playSessions, type RecordingDeviceSlot } from "@/lib/db/schema";
import { getEventsForSession } from "./session-events";

/**
 * A recording is a thin pointer over an already-captured play_session, not a
 * duplicated event pipeline: every live command is always persisted to
 * session_events (stats need it regardless of whether the user saves a
 * recording), so "saving a recording" just snapshots the session's device
 * slots and points a new row at it. This keeps the replay-loader query and
 * the stats-timeline query reading the exact same rows, with zero risk of
 * live/recorded data drifting apart.
 */
export async function createRecording(input: {
  sourcePlaySessionId: number;
  name: string;
  description?: string;
}) {
  const [session] = await db.select().from(playSessions).where(eq(playSessions.id, input.sourcePlaySessionId));
  if (!session) throw new Error("source play session not found");

  const sessionDeviceRows = await db
    .select({
      sessionDeviceId: sessionDevices.id,
      slotLabel: sessionDevices.slotLabel,
      bleName: devices.bleName,
      deviceClass: devices.deviceClass,
      capabilities: devices.capabilities,
    })
    .from(sessionDevices)
    .innerJoin(devices, eq(sessionDevices.deviceId, devices.id))
    .where(eq(sessionDevices.playSessionId, input.sourcePlaySessionId));

  const deviceSlots: RecordingDeviceSlot[] = sessionDeviceRows.map((row) => ({
    slotLabel: row.slotLabel,
    recordedBleName: row.bleName,
    deviceClass: row.deviceClass,
    capabilities: row.capabilities,
    sourceSessionDeviceId: row.sessionDeviceId,
  }));

  const [recording] = await db
    .insert(recordings)
    .values({
      sourcePlaySessionId: input.sourcePlaySessionId,
      name: input.name,
      description: input.description,
      createdAt: Date.now(),
      durationMs: session.durationMs ?? 0,
      deviceSlots,
      playCount: 0,
    })
    .returning();

  return recording;
}

export async function listRecordings() {
  return db.select().from(recordings).orderBy(desc(recordings.createdAt));
}

export async function getRecording(id: number) {
  const [recording] = await db.select().from(recordings).where(eq(recordings.id, id));
  if (!recording) return undefined;
  const events = await getEventsForSession(recording.sourcePlaySessionId);
  return { recording, events };
}

export async function renameRecording(id: number, input: { name?: string; description?: string }) {
  const [updated] = await db.update(recordings).set(input).where(eq(recordings.id, id)).returning();
  return updated;
}

export async function deleteRecording(id: number) {
  await db.delete(recordings).where(eq(recordings.id, id));
}

export async function incrementPlayCount(id: number, playedAt: number): Promise<void> {
  const [existing] = await db.select().from(recordings).where(eq(recordings.id, id));
  if (!existing) return;
  await db
    .update(recordings)
    .set({ playCount: existing.playCount + 1, lastPlayedAt: playedAt })
    .where(eq(recordings.id, id));
}