import { NextResponse } from "next/server";
import {
  COMPOSITION_FAMILIES,
  LAYOUT_TEMPLATE_LABELS,
  LAYOUT_TEMPLATES,
} from "@/lib/layout";
import { API_DOCS_URL } from "@/lib/plans";

export async function GET() {
  return NextResponse.json({
    name: "Songs2VID API",
    version: "1.0",
    authentication: "Authorization: Bearer <api_key>",
    requirements: ["YouTube account connected"],
    rateLimit: "100,000 requests per minute per account",
    billing: false,
    notes:
      "OSS self-hosted: full entitlements, no Stripe/credits/paywall. In-repo docs: docs/api/",
    webhooks:
      "Optional webhookUrl on job create — HTTPS POST JSON on item/job terminal states for n8n",
    guidance: {
      recommended:
        "For most jobs (especially 5+ audio files): POST /api/v1/upload per file, then POST /api/v1/render (or /api/v1/jobs) with paths + optional webhookUrl",
      batch:
        "POST /api/v1/jobs/batch is for small packs only. Large multipart bodies may fail with 'failed to parse body as FormData'",
      polling: "GET /api/v1/jobs/:id until status is COMPLETED, FAILED, or PARTIAL",
    },
    layoutTemplates: LAYOUT_TEMPLATES.map((id) => ({
      id,
      label: LAYOUT_TEMPLATE_LABELS[id],
    })),
    compositionFamilies: COMPOSITION_FAMILIES.map((family) => ({
      id: family.id,
      label: family.label,
      defaultTemplate: family.defaultTemplate,
      variants: family.variants.map((id) => ({
        id,
        label: LAYOUT_TEMPLATE_LABELS[id],
      })),
    })),
    endpoints: [
      {
        method: "POST",
        path: "/api/v1/upload",
        description:
          "Upload image, audio, PNG logo, or .ttf/.otf font (font ≤10MB)",
        body: "multipart/form-data: file, type (image|audio|logo|font)",
      },
      {
        method: "POST",
        path: "/api/v1/render",
        description:
          "Alias of /api/v1/jobs — create a render job (n8n-friendly). Optional webhookUrl for callbacks.",
        body: "application/json: { imagePath, webhookUrl?, items[{ audioPath, audioFilename, metadata }] }",
      },
      {
        method: "POST",
        path: "/api/v1/jobs",
        description:
          "Create a video job from uploaded file paths with layouts, watermark, and per-item covers",
        body: "application/json: { imagePath, webhookUrl?, items[{ audioPath, audioFilename, metadata }] }",
      },
      {
        method: "POST",
        path: "/api/v1/jobs/batch",
        description:
          "One-shot batch for small packs only; large uploads may fail FormData parsing; prefer upload + jobs",
        body: "multipart/form-data: image, audio[] (repeatable), metadata? (JSON string)",
      },
      {
        method: "GET",
        path: "/api/v1/playlists",
        description: "List YouTube playlists for the authenticated account",
      },
      {
        method: "POST",
        path: "/api/v1/playlists",
        description: "Create a YouTube playlist",
        body: "application/json: { title, description?, privacy? (public|unlisted|private) }",
      },
      {
        method: "GET",
        path: "/api/v1/jobs",
        description: "List recent jobs (also available as GET /api/v1/render)",
        query: "limit (default 20, max 100)",
      },
      {
        method: "GET",
        path: "/api/v1/jobs/:id",
        description: "Get job status and item details (poll for n8n)",
      },
    ],
    docs: API_DOCS_URL,
  });
}