import { NextRequest, NextResponse } from "next/server";
import { auth } from "@/app/(auth)/auth";
import {
  getEditableAgentPsdTemplateLayers,
  isAgentPsdTextLayerSlot,
  isAgentPsdTemplateReady,
  type AgentPsdTemplateListResponse,
} from "@/lib/agents/psd-template-config";
import { readAgentPsdFonts } from "@/lib/agents/psd-font-settings";
import { readAgentPsdTemplates } from "@/lib/agents/psd-template-settings";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

function jsonError(status: number, error: string) {
  const payload: AgentPsdTemplateListResponse = {
    success: false,
    templates: [],
    error,
  };
  return NextResponse.json(payload, { status });
}

export async function GET(request: NextRequest) {
  const session = await auth().catch(() => null);
  if (!session?.user?.id) {
    return jsonError(401, "未登录");
  }

  try {
    const requestedBrand = String(request.nextUrl.searchParams.get("brand") || "").trim();
    const fonts = await readAgentPsdFonts().catch(() => []);
    const fontMap = new Map(fonts.map((font) => [font.id, font]));
    const templates = (await readAgentPsdTemplates())
      .filter((template) => template.status === "active")
      .filter(isAgentPsdTemplateReady)
      .filter((template) =>
        requestedBrand ? template.brandName === requestedBrand : true
      )
      .map((template) => ({
        ...template,
        layers: getEditableAgentPsdTemplateLayers(template).map((layer) => {
          if (!isAgentPsdTextLayerSlot(layer) || !layer.fontId) {
            return layer;
          }

          const font = fontMap.get(layer.fontId);
          if (!font) {
            return layer;
          }

          return {
            ...layer,
            fontFileUrl: font.fileUrl,
            fontContentType: font.contentType,
          };
        }),
      }))
      .filter((template) => template.layers.length > 0);

    return NextResponse.json({
      success: true,
      templates,
    } satisfies AgentPsdTemplateListResponse);
  } catch (error) {
    console.error("[PSD Templates] list failed:", error);
    return jsonError(503, "PSD 模板读取失败");
  }
}