import { NextRequest, NextResponse } from "next/server";
import { auth } from "@/auth";
import { db } from "@/lib/db";

export async function GET(req: NextRequest) {
  const session = await auth();
  if (!session?.user) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  const projectId = req.nextUrl.searchParams.get("projectId");
  if (!projectId) {
    return NextResponse.json({ error: "projectId required" }, { status: 400 });
  }

  // All versions are linked to tasks (taskId), not directly to shots.
  // We query shots with their tasks, and for each task get the latest version.
  const shots = await db.shot.findMany({
    where: {
      projectId,
      tasks: {
        some: {
          versions: { some: { isLatest: true } },
        },
      },
    },
    orderBy: [{ episode: "asc" }, { scene: "asc" }, { shotNumber: "asc" }],
    select: {
      id: true,
      shotCode: true,
      episode: true,
      status: true,
      shotApprovalStatus: true,
      sharedWithClient: true,
      thumbnailUrl: true,
      tasks: {
        select: {
          id: true,
          title: true,
          versions: {
            where: { isLatest: true },
            take: 1,
            orderBy: { createdAt: "desc" },
            select: {
              id: true,
              versionNumber: true,
              fileUrl: true,
              thumbnailUrl: true,
              posterUrl: true,
              fps: true,
              approvalStatus: true,
              mimeType: true,
              createdAt: true,
            },
          },
        },
      },
    },
  });

  // For each shot, pick the most recently uploaded latest version across all tasks
  const playlist = shots
    .map((shot) => {
      const versions = shot.tasks
        .flatMap((t) => t.versions.map((v) => ({ ...v, taskTitle: t.title })))
        .sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime());

      const latest = versions[0] ?? null;
      if (!latest) return null;

      return {
        id: shot.id,
        shotCode: shot.shotCode,
        episode: shot.episode,
        status: shot.status,
        shotApprovalStatus: shot.shotApprovalStatus,
        sharedWithClient: shot.sharedWithClient,
        thumbnailUrl: shot.thumbnailUrl,
        latestVersion: {
          id: latest.id,
          versionNumber: latest.versionNumber,
          fileUrl: latest.fileUrl,
          thumbnailUrl: latest.thumbnailUrl,
          posterUrl: latest.posterUrl,
          fps: latest.fps,
          approvalStatus: latest.approvalStatus,
          taskTitle: latest.taskTitle,
        },
      };
    })
    .filter((s): s is NonNullable<typeof s> => s !== null);

  return NextResponse.json({ shots: playlist });
}