import { Router, type Request, type Response } from 'express';
import { prisma } from '../lib/prisma';
import { basicAuth } from '../middlewares/basicAuth';
import { CreateModelSchema, UpdateModelSchema, ListQuerySchema } from '../lib/validators';
import { decodeBase64ToBuffer } from '../lib/base64';

export const router = Router();

// Create model
router.post('/', basicAuth, async (req: Request, res: Response) => {
  const parsed = CreateModelSchema.safeParse(req.body);
  if (!parsed.success) return res.status(400).json({ error: parsed.error.flatten() });
  const { title, desc, model, previewBase64, previewMime } = parsed.data;
  const created = await prisma.circuitModel.create({
    data: {
      title,
      desc,
      model,
      preview: decodeBase64ToBuffer(previewBase64),
      previewMime: previewBase64 ? (previewMime ?? 'image/png') : null,
      authorId: (req as any).user.id,
    },
  });
  res.status(201).json({ id: created.id });
});

// Update model
router.put('/:id', basicAuth, async (req: Request, res: Response) => {
  const id = req.params.id;
  const owned = await prisma.circuitModel.findUnique({ where: { id }, select: { authorId: true } });
  if (!owned) return res.status(404).json({ error: 'Not found' });
  if (owned.authorId !== (req as any).user.id) return res.status(403).json({ error: 'Forbidden' });
  const parsed = UpdateModelSchema.safeParse(req.body);
  if (!parsed.success) return res.status(400).json({ error: parsed.error.flatten() });
  const { title, desc, model, previewBase64, previewMime } = parsed.data;
  const data: any = {};
  if (title !== undefined) data.title = title;
  if (desc !== undefined) data.desc = desc;
  if (model !== undefined) data.model = model;
  if (previewBase64 !== undefined) {
    data.preview = decodeBase64ToBuffer(previewBase64);
    data.previewMime = previewBase64 ? (previewMime ?? 'image/png') : null;
  }
  const updated = await prisma.circuitModel.update({ where: { id }, data });
  res.json({ id: updated.id });
});

// Delete model
router.delete('/:id', basicAuth, async (req: Request, res: Response) => {
  const id = req.params.id;
  const owned = await prisma.circuitModel.findUnique({ where: { id }, select: { authorId: true } });
  if (!owned) return res.status(404).json({ error: 'Not found' });
  if (owned.authorId !== (req as any).user.id) return res.status(403).json({ error: 'Forbidden' });
  await prisma.circuitModel.delete({ where: { id } });
  res.status(204).end();
});

// Get by id
router.get('/:id', async (req: Request, res: Response) => {
  const id = req.params.id;
  const m = await prisma.circuitModel.findUnique({
    where: { id },
    select: {
      id: true,
      title: true,
      desc: true,
      model: true,
      authorId: true,
      createdAt: true,
      updatedAt: true,
    },
  });
  if (!m) return res.status(404).json({ error: 'Not found' });
  res.json(m);
});

// List models with pagination and simple search
router.get('/', async (req: Request, res: Response) => {
  const parsed = ListQuerySchema.safeParse(req.query);
  if (!parsed.success) return res.status(400).json({ error: parsed.error.flatten() });
  const { page, pageSize, authorId, sort, q } = parsed.data;
  const where: any = {};
  if (authorId) where.authorId = authorId;
  if (q) where.OR = [
    { title: { contains: q, mode: 'insensitive' } },
    { desc: { contains: q, mode: 'insensitive' } },
  ];
  const total = await prisma.circuitModel.count({ where });
  const items = await prisma.circuitModel.findMany({
    where,
    orderBy: { createdAt: sort === 'new' ? 'desc' : 'asc' },
    skip: (page - 1) * pageSize,
    take: pageSize,
    select: {
      id: true,
      title: true,
      authorId: true,
      createdAt: true,
      updatedAt: true,
    },
  });
  res.json({ page, pageSize, total, items });
});

// Download model JSON
router.get('/:id/model.json', async (req: Request, res: Response) => {
  const id = req.params.id;
  const m = await prisma.circuitModel.findUnique({ where: { id }, select: { model: true, title: true } });
  if (!m) return res.status(404).end();
  res.setHeader('Content-Type', 'application/json');
  res.setHeader('Content-Disposition', `attachment; filename="${encodeURIComponent(m.title)}.json"`);
  res.end(JSON.stringify(m.model));
});

// Get preview image
router.get('/:id/preview', async (req: Request, res: Response) => {
  const id = req.params.id;
  const m = await prisma.circuitModel.findUnique({ where: { id }, select: { preview: true, previewMime: true } });
  if (!m || !m.preview) return res.status(404).end();
  res.setHeader('Content-Type', m.previewMime ?? 'image/png');
  res.end(Buffer.from(m.preview));
});