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

// ── Auth ─────────────────────────────────────────────────────────────────────

function isAuthorized(req: NextRequest): boolean {
  const apiKey = process.env.API_SECRET_KEY;
  if (!apiKey) return false;
  const authHeader = req.headers.get("authorization") ?? "";
  if (authHeader.startsWith("Bearer ")) return authHeader.slice(7) === apiKey;
  return (req.headers.get("x-api-key") ?? "") === apiKey;
}

// ── GET /api/ext/projects/[projectCode]/shots ─────────────────────────────────
//
// Returns all shots for a project, optionally filtered by episode and/or sequence.
// Uses the human-readable project code (e.g. UNG_108) not the DB id.
//
// Query params (all optional):
//   episode   e.g. 108
//   sequence  e.g. 004
//   status    e.g. IN_PROGRESS
//   page      (default 1)
//   limit     (default 200, max 500)
//
// Example:
//   GET /api/ext/projects/UNG_108/shots?episode=108&sequence=004
//   GET /api/ext/projects/UNG_108/shots

export async function GET(
  req: NextRequest,
  { params }: { params: Promise<{ projectCode: string }> }
) {
  if (!isAuthorized(req)) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  const { projectCode } = await params;
  const { searchParams } = new URL(req.url);

  const episode  = searchParams.get("episode")?.trim() || undefined;
  const sequence = searchParams.get("sequence")?.trim() || undefined;
  const status   = searchParams.get("status")?.trim() || undefined;
  const page     = Math.max(1, parseInt(searchParams.get("page") ?? "1", 10));
  const limit    = Math.min(500, Math.max(1, parseInt(searchParams.get("limit") ?? "200", 10)));
  const skip     = (page - 1) * limit;

  const project = await db.project.findUnique({
    where: { code: projectCode },
    select: { id: true, name: true, code: true, showId: true },
  });

  if (!project) {
    return NextResponse.json({ error: "Project not found" }, { status: 404 });
  }

  const [shots, total] = await Promise.all([
    db.shot.findMany({
      where: {
        projectId: project.id,
        ...(episode  ? { episode }  : {}),
        ...(sequence ? { sequence } : {}),
        ...(status   ? { status: status as never } : {}),
      },
      orderBy: [{ episode: "asc" }, { shotCode: "asc" }],
      skip,
      take: limit,
      select: {
        id:            true,
        shotCode:      true,
        scene:         true,
        episode:       true,
        sequence:      true,
        shotNumber:    true,
        description:   true,
        status:        true,
        priority:      true,
        frameStart:    true,
        frameEnd:      true,
        fps:           true,
        dueDate:       true,
        // EDL / pull CSV fields
        sourceClip:    true,
        timecodeStart: true,
        timecodeEnd:   true,
        clipDuration:  true,
        exrOutput:     true,
        thumbnailUrl:  true,
        artist: {
          select: { id: true, name: true, email: true },
        },
        _count: { select: { versions: true, tasks: true } },
      },
    }),
    db.shot.count({
      where: {
        projectId: project.id,
        ...(episode  ? { episode }  : {}),
        ...(sequence ? { sequence } : {}),
        ...(status   ? { status: status as never } : {}),
      },
    }),
  ]);

  return NextResponse.json({
    project,
    pagination: { page, limit, total, pages: Math.ceil(total / limit) },
    shots,
  });
}