/**
 * GET    /api/items?auctionId=          – catalog (bidders see active/preview only)
 * POST   /api/items                     – create item
 * GET    /api/items/:id                 – get item with media + bid history
 * PATCH  /api/items/:id                 – update item
 * DELETE /api/items/:id                 – delete item (draft only)
 * POST   /api/items/:id/media           – attach media record after S3 upload
 * DELETE /api/items/:id/media/:mediaId  – remove media
 */
import { Router } from "express";
import { z } from "zod";
import { prisma } from "../lib/prisma.js";
import { requireAuth, requireRole } from "../middleware/auth.js";

export const itemsRouter = Router();

const STAFF_WRITE = requireRole("admin", "event_manager");

// ── List / catalog ─────────────────────────────────────────────────────────────
itemsRouter.get("/", requireAuth, async (req, res) => {
  const { auctionId } = req.query;
  if (typeof auctionId !== "string") {
    res.status(400).json({ error: "auctionId query param required" });
    return;
  }

  const isStaff = ["admin", "event_manager", "auctioneer", "spotter"].includes(
    req.auth!.role,
  );

  const items = await prisma.auctionItem.findMany({
    where: {
      auctionId,
      // Bidders only see preview/active/going_once/going_twice/sold/closed
      ...(!isStaff && { state: { notIn: ["passed"] } }),
    },
    orderBy: { sortOrder: "asc" },
    include: {
      media: { orderBy: { sortOrder: "asc" } },
      _count: { select: { bids: true } },
    },
  });
  res.json(items);
});

// ── Create ─────────────────────────────────────────────────────────────────────
const CreateItemSchema = z.object({
  auctionId: z.string(),
  lotNumber: z.string().min(1),
  title: z.string().min(1),
  description: z.string().nullable().optional(),
  donorName: z.string().nullable().optional(),
  category: z.string().nullable().optional(),
  fairMarketValue: z.number().positive().nullable().optional(),
  openingBid: z.number().min(0).default(0),
  reservePrice: z.number().positive().nullable().optional(),
  bidIncrement: z.number().positive().default(10),
  pickupNotes: z.string().nullable().optional(),
  sortOrder: z.number().int().default(0),
  silentWindowId: z.string().nullable().optional(),
  softCloseEnabled: z.boolean().default(false),
  softCloseExtendMinutes: z.number().int().min(1).max(60).default(2),
});

itemsRouter.post("/", requireAuth, STAFF_WRITE, async (req, res) => {
  const parse = CreateItemSchema.safeParse(req.body);
  if (!parse.success) {
    res.status(400).json({ error: parse.error.flatten() });
    return;
  }

  // Check lot number uniqueness within auction
  const dup = await prisma.auctionItem.findUnique({
    where: {
      auctionId_lotNumber: {
        auctionId: parse.data.auctionId,
        lotNumber: parse.data.lotNumber,
      },
    },
  });
  if (dup) {
    res.status(409).json({ error: "Lot number already exists in this auction" });
    return;
  }

  const item = await prisma.auctionItem.create({ data: parse.data });
  res.status(201).json(item);
});

// ── Get ────────────────────────────────────────────────────────────────────────
itemsRouter.get("/:id", requireAuth, async (req, res) => {
  const item = await prisma.auctionItem.findUnique({
    where: { id: req.params["id"] },
    include: {
      media: { orderBy: { sortOrder: "asc" } },
      bids: {
        orderBy: { createdAt: "desc" },
        take: 20,
        include: { bidder: { select: { paddleNumber: true } } },
      },
    },
  });
  if (!item) {
    res.status(404).json({ error: "Item not found" });
    return;
  }

  // Bidders see abbreviated bid history (no paddleNumbers of others)
  if (req.auth!.role === "bidder") {
    const safe = {
      ...item,
      bids: item.bids.map((b) => ({
        id: b.id,
        amount: b.amount,
        isWinning: b.isWinning,
        createdAt: b.createdAt,
        isMine: b.bidderId === req.auth!.sub,
      })),
    };
    res.json(safe);
    return;
  }

  res.json(item);
});

// ── Update ─────────────────────────────────────────────────────────────────────
const UpdateItemSchema = CreateItemSchema.omit({ auctionId: true }).partial().extend({
  state: z.enum(["preview", "active", "going_once", "going_twice", "sold", "passed", "closed"]).optional(),
});

itemsRouter.patch("/:id", requireAuth, STAFF_WRITE, async (req, res) => {
  const parse = UpdateItemSchema.safeParse(req.body);
  if (!parse.success) {
    res.status(400).json({ error: parse.error.flatten() });
    return;
  }
  const item = await prisma.auctionItem.update({
    where: { id: req.params["id"] },
    data: parse.data,
  });
  res.json(item);
});

// ── Delete ─────────────────────────────────────────────────────────────────────
itemsRouter.delete("/:id", requireAuth, STAFF_WRITE, async (req, res) => {
  const item = await prisma.auctionItem.findUnique({ where: { id: req.params["id"] } });
  if (!item) {
    res.status(404).json({ error: "Item not found" });
    return;
  }
  if (item.state !== "preview") {
    res.status(409).json({ error: "Cannot delete an item that has been activated" });
    return;
  }
  await prisma.auctionItem.delete({ where: { id: item.id } });
  res.json({ ok: true });
});

// ── Attach media (after client uploads to S3) ──────────────────────────────────
const AttachMediaSchema = z.object({
  mediaType: z.enum(["image", "video", "document", "embed"]),
  url: z.string().url(),
  thumbnailUrl: z.string().url().nullable().optional(),
  caption: z.string().nullable().optional(),
  sortOrder: z.number().int().default(0),
});

itemsRouter.post("/:id/media", requireAuth, STAFF_WRITE, async (req, res) => {
  const parse = AttachMediaSchema.safeParse(req.body);
  if (!parse.success) {
    res.status(400).json({ error: parse.error.flatten() });
    return;
  }
  const media = await prisma.itemMedia.create({
    data: { ...parse.data, itemId: req.params["id"] },
  });
  res.status(201).json(media);
});

itemsRouter.delete("/:id/media/:mediaId", requireAuth, STAFF_WRITE, async (req, res) => {
  await prisma.itemMedia.deleteMany({
    where: { id: req.params["mediaId"], itemId: req.params["id"] },
  });
  res.json({ ok: true });
});