import { NextRequest, NextResponse } from "next/server";
import { upsertSystemSetting } from "@/lib/db/queries";
import { requireAgentWorkflowAdmin } from "@/lib/middleware/admin";
import {
  AGENT_PSD_FONTS_KEY,
  type AgentPsdFontMutationResponse,
} from "@/lib/agents/psd-font-config";
import { isAgentPsdTextLayerSlot } from "@/lib/agents/psd-template-config";
import {
  readAgentPsdFonts,
  tryDeleteAgentPsdFontAssets,
} from "@/lib/agents/psd-font-settings";
import { readAgentPsdTemplates } from "@/lib/agents/psd-template-settings";

export const runtime = "nodejs";

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

export async function DELETE(
  request: NextRequest,
  context: { params: Promise<{ id: string }> }
) {
  const session = await requireAgentWorkflowAdmin().catch(() => null);
  if (!session?.user?.id) {
    return jsonError(401, "未登录");
  }

  try {
    const { id } = await context.params;
    const fonts = await readAgentPsdFonts();
    const font = fonts.find((entry) => entry.id === id);

    if (!font) {
      return jsonError(404, "字体不存在");
    }

    const templates = await readAgentPsdTemplates();
    const blockingTemplate = templates.find((template) =>
      template.layers.some(
        (layer) =>
          isAgentPsdTextLayerSlot(layer) &&
          layer.fontId === font.id &&
          layer.isEditable
      )
    );
    if (blockingTemplate) {
      return jsonError(400, `字体仍被模板“${blockingTemplate.name}”使用，请先解除关联`);
    }

    await upsertSystemSetting({
      key: AGENT_PSD_FONTS_KEY,
      value: fonts.filter((entry) => entry.id !== id),
      updatedBy: session.user.id,
    });

    await tryDeleteAgentPsdFontAssets(font);

    return NextResponse.json({
      success: true,
      font,
    } satisfies AgentPsdFontMutationResponse);
  } catch (error) {
    console.error("[PSD Fonts][Admin] delete failed:", error);
    return jsonError(502, "字体删除失败");
  }
}