Epicure/apps/web/app/api/v1/recipes/route.ts

import { NextRequest, NextResponse } from "next/server";
import { db, recipes, recipeIngredients, recipeSteps } from "@epicure/db";
import { eq, desc, and } from "@epicure/db";
import { z } from "zod";
import { requireSessionOrApiKey } from "@/lib/api-auth";
import { checkTierLimit, incrementUsage } from "@/lib/tiers";
import { dispatchWebhook } from "@/lib/webhooks";

const UNICODE_FRACTIONS: Record<string, number> = {
  "½": 0.5, "⅓": 1/3, "⅔": 2/3, "¼": 0.25, "¾": 0.75,
  "⅕": 0.2, "⅖": 0.4, "⅗": 0.6, "⅘": 0.8,
  "⅙": 1/6, "⅚": 5/6, "⅛": 0.125, "⅜": 0.375, "⅝": 0.625, "⅞": 0.875,
};

function parseQuantity(v: string | number | undefined): string | undefined {
  if (v === undefined || v === "") return undefined;
  const s = String(v).trim();
  if (!s) return undefined;

  if (UNICODE_FRACTIONS[s] !== undefined) return String(UNICODE_FRACTIONS[s]);

  for (const [frac, val] of Object.entries(UNICODE_FRACTIONS)) {
    if (s.endsWith(frac)) {
      const whole = s.slice(0, -frac.length).trim();
      if (!whole) return String(val);
      const w = parseFloat(whole);
      if (!isNaN(w)) return String(w + val);
    }
  }

  const mixed = s.match(/^(\d+)\s+(\d+)\s*\/\s*(\d+)$/);
  if (mixed) {
    const den = parseInt(mixed[3]!);
    if (den !== 0) return String(parseInt(mixed[1]!) + parseInt(mixed[2]!) / den);
  }

  const slash = s.match(/^(\d+)\s*\/\s*(\d+)$/);
  if (slash) {
    const den = parseInt(slash[2]!);
    if (den !== 0) return String(parseInt(slash[1]!) / den);
  }

  const n = parseFloat(s);
  return isNaN(n) ? undefined : String(n);
}

const CreateRecipeSchema = z.object({
  title: z.string().min(1).max(200),
  description: z.string().optional(),
  baseServings: z.number().int().min(1).max(100).default(4),
  visibility: z.enum(["private", "unlisted", "public"]).default("private"),
  difficulty: z.enum(["easy", "medium", "hard"]).optional(),
  prepMins: z.number().int().min(0).optional(),
  cookMins: z.number().int().min(0).optional(),
  aiGenerated: z.boolean().optional(),
  dietaryTags: z.object({
    vegan: z.boolean().optional(),
    vegetarian: z.boolean().optional(),
    glutenFree: z.boolean().optional(),
    dairyFree: z.boolean().optional(),
    nutFree: z.boolean().optional(),
    halal: z.boolean().optional(),
    kosher: z.boolean().optional(),
  }).optional(),
  ingredients: z.array(z.object({
    rawName: z.string().min(1),
    quantity: z.union([z.number(), z.string()]).optional().transform(parseQuantity),
    unit: z.string().optional(),
    note: z.string().optional(),
    order: z.number().int().default(0),
  })).default([]),
  steps: z.array(z.object({
    instruction: z.string().min(1),
    timerSeconds: z.number().int().optional(),
    order: z.number().int().optional(),
  })).default([]),
});

export async function GET(req: NextRequest) {
  const { session, response } = await requireSessionOrApiKey(req, { rateLimit: { limit: 60, windowSeconds: 60 } });
  if (response) return response;

  const { searchParams } = new URL(req.url);
  const limit = Math.min(parseInt(searchParams.get("limit") ?? "20"), 100);
  const offset = parseInt(searchParams.get("offset") ?? "0");
  const visibility = searchParams.get("visibility") as "private" | "unlisted" | "public" | null;

  const conditions = [eq(recipes.authorId, session!.user.id)];
  if (visibility) conditions.push(eq(recipes.visibility, visibility));

  const rows = await db
    .select()
    .from(recipes)
    .where(and(...conditions))
    .orderBy(desc(recipes.updatedAt))
    .limit(limit)
    .offset(offset);

  return NextResponse.json({ data: rows, limit, offset });
}

export async function POST(req: NextRequest) {
  const { session, response } = await requireSessionOrApiKey(req, { rateLimit: { limit: 60, windowSeconds: 60 } });
  if (response) return response;

  const body = await req.json() as unknown;
  const parsed = CreateRecipeSchema.safeParse(body);
  if (!parsed.success) {
    return NextResponse.json({ error: "Validation error", issues: parsed.error.issues }, { status: 400 });
  }

  await checkTierLimit(session!.user.id, session!.user.tier as "free" | "pro", "recipe");

  const id = crypto.randomUUID();
  const now = new Date();
  const data = parsed.data;

  await db.transaction(async (tx) => {
    await tx.insert(recipes).values({
      id,
      authorId: session!.user.id,
      title: data.title,
      description: data.description,
      baseServings: data.baseServings,
      visibility: data.visibility,
      difficulty: data.difficulty,
      prepMins: data.prepMins,
      cookMins: data.cookMins,
      dietaryTags: data.dietaryTags ?? {},
      aiGenerated: data.aiGenerated ?? false,
      createdAt: now,
      updatedAt: now,
    });

    if (data.ingredients.length > 0) {
      await tx.insert(recipeIngredients).values(
        data.ingredients.map((ing, i) => ({
          id: crypto.randomUUID(),
          recipeId: id,
          rawName: ing.rawName,
          quantity: ing.quantity,
          unit: ing.unit,
          note: ing.note,
          order: ing.order ?? i,
        }))
      );
    }

    if (data.steps.length > 0) {
      await tx.insert(recipeSteps).values(
        data.steps.map((step, i) => ({
          id: crypto.randomUUID(),
          recipeId: id,
          instruction: step.instruction,
          timerSeconds: step.timerSeconds,
          order: step.order ?? i,
        }))
      );
    }
  });

  await incrementUsage(session!.user.id, "recipe");

  const recipe = await db.query.recipes.findFirst({ where: eq(recipes.id, id) });
  void dispatchWebhook(session!.user.id, "recipe.created", { id, title: data.title });
  return NextResponse.json(recipe, { status: 201 });
}