import { tool } from "ai";
import { z } from "zod";

const CreateRecipeInputSchema = z.object({
  title: z.string().min(1).max(200),
  description: z.string().max(2000).optional(),
  baseServings: z.number().int().min(1).max(100).default(4),
  recipeType: z.enum(["dish", "drink"]).default("dish"),
  difficulty: z.enum(["easy", "medium", "hard"]).optional(),
  prepMins: z.number().int().min(0).max(1440).optional(),
  cookMins: z.number().int().min(0).max(1440).optional(),
  ingredients: z.array(z.object({
    rawName: z.string().min(1).max(200).describe("Ingredient name only, e.g. 'flour' — never combined with quantity/unit"),
    quantity: z.number().optional().describe("A number only, e.g. 0.25, 1.5, 2"),
    unit: z.string().max(50).optional().describe("e.g. 'cup', 'tbsp', 'g'"),
  })).min(1).max(100),
  steps: z.array(z.object({
    instruction: z.string().min(1).max(2000),
  })).min(1).max(100),
});

export type CreateRecipeToolInput = z.infer<typeof CreateRecipeInputSchema>;

/**
 * Lets the cooking assistant propose a new recipe from the conversation.
 * Deliberately does NOT write to the database — `execute` just validates and
 * echoes the input back as a draft. The chat UI renders that draft with an
 * explicit Confirm button, which POSTs to the existing /api/v1/recipes
 * endpoint (the same one the manual recipe editor uses) — so nothing gets
 * created without the user directly approving it, and there's exactly one
 * code path that actually writes a recipe row.
 */
export const createRecipeTool = tool({
  description:
    "Propose creating a new recipe based on the conversation. This only drafts the recipe for the user to review — it does not save anything. Only call this when the user has actually asked you to create/save/write down a recipe, not just discussed one.",
  inputSchema: CreateRecipeInputSchema,
  execute: async (input: CreateRecipeToolInput) => input,
});