import { generateObject } from "ai";
import { z } from "zod";
import { resolveModel, type AiConfig } from "../factory";
import { dietaryTagsSchema, ingredientSchema, stepSchema } from "./recipe-schema";
import type { PhotoRecognition } from "./recognize-photo";

const RecipeOutputSchema = z.object({
  title: z.string(),
  description: z.string().optional(),
  baseServings: z.number().int().min(1).max(100),
  prepMins: z.number().int().min(0).optional(),
  cookMins: z.number().int().min(0).optional(),
  difficulty: z.enum(["easy", "medium", "hard"]),
  dietaryTags: dietaryTagsSchema,
  ingredients: z.array(ingredientSchema(z.number())),
  steps: z.array(stepSchema),
});

export type GeneratedRecipeFromRecognition = z.infer<typeof RecipeOutputSchema>;

/** Step 2 of the photo-import flow: a text model reconstructs the full recipe
 * (quantities, steps, timing) from what the vision model recognized in
 * `recognizePhoto` — it never sees the photo itself. */
export async function generateRecipeFromRecognition(
  recognition: PhotoRecognition,
  config?: AiConfig & { language?: string },
): Promise<GeneratedRecipeFromRecognition> {
  const model = resolveModel(config);
  const lang = config?.language ?? "en";
  const langInstruction = lang !== "en" ? ` Write the entire recipe (title, description, ingredient names, step instructions) in ${lang}.` : "";
  const drinkInstruction = recognition.recipeType === "drink"
    ? " This is a drink: never set cookMins, and default baseServings to 1 unless the description implies more than one serving."
    : "";

  const { object } = await generateObject({
    model,
    schema: RecipeOutputSchema,
    system:
      `You are a professional chef and culinary writer. A vision model has already identified what's in a photo — reconstruct the complete, precise recipe implied by that description. For ingredients: quantity must be a number only (e.g. 0.25, 1.5, 2), unit is a separate string. Never combine quantity and unit into one string.${drinkInstruction}${langInstruction}`,
    prompt: `Photo shows: "${recognition.title}"\nVisible ingredients: ${recognition.visibleIngredients.join(", ") || "none clearly visible"}\nDescription: ${recognition.description}\n\nWrite the complete recipe for this ${recognition.recipeType}.`,
  });

  if (recognition.recipeType === "drink") {
    return { ...object, cookMins: undefined };
  }
  return object;
}