import { auth } from "@/lib/auth";
import { prisma } from "@/lib/prisma";
import { buildCampaignPrompt, launchPipeline, type AppConfig } from "@/lib/claude";
import path from "path";
import { mkdirSync } from "fs";

export async function POST(
  _request: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  const session = await auth();
  if (!session) return new Response("Unauthorized", { status: 401 });

  const { id } = await params;

  const campaign = await prisma.campaign.findUnique({
    where: { id },
    include: { app: true },
  });
  if (!campaign) {
    return Response.json({ error: "Not found" }, { status: 404 });
  }

  if (campaign.status !== "draft") {
    return Response.json(
      { error: "Campaign is not in draft status" },
      { status: 400 }
    );
  }

  // Build AppConfig from the campaign's app
  let appConfig: AppConfig | undefined;
  if (campaign.app) {
    const app = campaign.app;
    appConfig = {
      name: app.name,
      slug: app.slug,
      primaryColor: app.primaryColor,
      accentColor: app.accentColor,
      darkBg: app.darkBg,
      assetsDir: `apps/${app.slug}`,
      brandIdentity: app.brandIdentity,
      productInfo: app.productInfo,
      platformGuidelines: app.platformGuidelines,
    };
  }

  const config = campaign.config ? JSON.parse(campaign.config) : {};
  const pipelineRoot =
    process.env.PIPELINE_ROOT || path.join(process.cwd(), "pipeline");

  const dateStr = new Date().toISOString().slice(0, 10).replace(/-/g, "");
  const taskName = campaign.name.replace(/\s+/g, "_").toLowerCase();
  const outputPath = `outputs/${taskName}_${dateStr}`;

  // Create output directories
  const dirs = ["ads", "scripts", "video", "copy"];
  for (const dir of dirs) {
    mkdirSync(path.join(pipelineRoot, outputPath, dir), { recursive: true });
  }

  const prompt = buildCampaignPrompt(
    {
      name: campaign.name,
      platforms: JSON.parse(campaign.platforms),
      goal: config.goal || "brand awareness",
      keyMessage: config.keyMessage || campaign.name,
      socialProof: config.socialProof,
      targetAudience: config.targetAudience,
      visualDirection: config.visualDirection,
      competitorApps: config.competitorApps,
      variations: config.variations,
      useTrendReport: config.useTrendReport,
      screenshots: config.screenshots,
    },
    appConfig
  );

  await prisma.campaign.update({
    where: { id },
    data: { prompt, outputPath },
  });

  // Launch pipeline asynchronously — don't await
  launchPipeline(id, prompt, pipelineRoot, appConfig).catch((err) =>
    console.error(`Pipeline failed for campaign ${id}:`, err)
  );

  return Response.json({ status: "launched", outputPath });
}