import { NextResponse } from "next/server";
import { createSupabaseRouteClient } from "@/lib/supabase/server";
import { rewriteToPublicOrigin } from "@/lib/url/rewritePublicOrigin";
import { getMnoteRuntimeConfig } from "@/lib/runtime-config";
import supabaseAdmin from "@/lib/supabase/admin";

export const dynamic = "force-dynamic";

const isUuid = (value: string) =>
  /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i.test(value);

const resolveAssetObjectLocation = async (params: {
  bucket?: string | null;
  storagePath?: string | null;
  workspaceId?: string | null;
  fileName?: string | null;
}) => {
  const { bucket, storagePath, workspaceId, fileName } = params;
  const ws = (workspaceId ?? "").trim();
  const fn = (fileName ?? "").trim();

  if (!ws || !isUuid(ws) || !fn) return null;

  try {
    const storage = supabaseAdmin.schema("storage");

    // 1) 若已给出 bucket/path，先校验是否存在
    const b = (bucket ?? "").trim();
    const p = (storagePath ?? "").trim();
    if (b && p) {
      const { data: exact, error: exactError } = await storage
        .from("objects")
        .select("bucket_id,name")
        .eq("bucket_id", b)
        .eq("name", p)
        .limit(1);
      if (!exactError && exact && exact.length > 0) {
        return { bucket: b, path: p };
      }
    }

    // 2) 兼容历史数据：按 workspace_id/%/file_name 查找
    const pattern = `${ws}/%/${fn}`;
    const { data: candidates, error: candError } = await storage
      .from("objects")
      .select("bucket_id,name,created_at")
      .like("name", pattern)
      .order("created_at", { ascending: false })
      .limit(20);

    if (candError || !candidates || candidates.length === 0) return null;

    const exactCandidate =
      candidates.find((o) => String(o?.name || "").endsWith(`/${fn}`)) ??
      candidates[0];
    if (!exactCandidate?.bucket_id || !exactCandidate?.name) return null;
    return { bucket: String(exactCandidate.bucket_id), path: String(exactCandidate.name) };
  } catch {
    return null;
  }
};

export async function GET(request: Request) {
  const supabase = await createSupabaseRouteClient();
  const {
    data: { user },
    error: authError,
  } = await supabase.auth.getUser();

  if (authError || !user) {
    return NextResponse.json({ error: "未登录" }, { status: 401 });
  }

  const { searchParams } = new URL(request.url);
  const assetId = searchParams.get("assetId");

  if (!assetId) {
    return NextResponse.json({ error: "缺少 assetId" }, { status: 400 });
  }

  // 获取资源信息
  const { data: asset, error: assetError } = await supabase
    .from("media_assets")
    .select("*")
    .eq("id", assetId)
    .single();

  if (assetError || !asset) {
    return NextResponse.json({ error: "资源不存在" }, { status: 404 });
  }

  // 兼容：早期/异常写入的 media_assets 可能缺少 bucket/storage_path，
  // 导致生成的签名链接指向不存在的对象（ONLYOFFICE 会报“下载失败”）。
  let bucket = (asset.bucket as string | null) ?? null;
  let storagePath = (asset.storage_path as string | null) ?? null;
  if (!bucket || !storagePath) {
    const resolved = await resolveAssetObjectLocation({
      bucket,
      storagePath,
      workspaceId: asset.workspace_id ?? null,
      fileName: asset.file_name ?? null,
    });
    if (!resolved) {
      return NextResponse.json({ error: "未找到存储对象，无法生成签名链接" }, { status: 404 });
    }
    bucket = resolved.bucket;
    storagePath = resolved.path;

    // 尽量回填，避免后续重复修复
    await supabase
      .from("media_assets")
      .update({ bucket, storage_path: storagePath })
      .eq("id", asset.id);
  }

  // 对于图片，添加高质量参数以获得更好的显示效果
  // Supabase Storage 支持通过 URL 参数控制图片质量和尺寸
  const isImage = asset.mime_type?.startsWith("image/");
  let signedUrl: string;

  if (isImage) {
    // 使用 createSignedUrl 并添加高质量参数
    // 注意：transform 参数需要在签名时指定
    const { data: signedUrlData, error: signError } = await supabase.storage
      .from(bucket)
      .createSignedUrl(storagePath, 60 * 60, {
        // 添加转换参数以获得高质量图片
        transform: {
          quality: 95,  // 高质量
          format: "origin",  // 保持原始格式
        },
      });

    if (signError || !signedUrlData) {
      return NextResponse.json({ error: "生成签名 URL 失败" }, { status: 500 });
    }
    signedUrl = signedUrlData.signedUrl;
  } else {
    // 非图片文件，直接生成签名 URL
    const { data: signedUrlData, error: signError } = await supabase.storage
      .from(bucket)
      .createSignedUrl(storagePath, 60 * 60);

    if (signError || !signedUrlData) {
      return NextResponse.json({ error: "生成签名 URL 失败" }, { status: 500 });
    }
    signedUrl = signedUrlData.signedUrl;
  }

  signedUrl = rewriteToPublicOrigin(signedUrl, getMnoteRuntimeConfig().supabaseUrl);

  return NextResponse.json({
    signedUrl,
    asset: {
      id: asset.id,
      file_name: asset.file_name,
      mime_type: asset.mime_type,
      file_size: asset.file_size,
    },
  });
}