import type { RequestHandler } from './$types';
import { json, error } from '@sveltejs/kit';
import { z } from 'zod';
import { getDb } from '$lib/server/db';
import { parsePositiveIntParam, validateBody } from '$lib/server/api-helpers';
import {
  deleteRecipe,
  getRecipeById,
  replaceIngredients,
  replaceSteps,
  updateRecipeMeta
} from '$lib/server/recipes/repository';
import {
  listComments,
  listCookingLog,
  listRatings,
  renameRecipe,
  setRecipeHiddenFromRecent
} from '$lib/server/recipes/actions';

const IngredientSchema = z.object({
  position: z.number().int().nonnegative(),
  quantity: z.number().nullable(),
  unit: z.string().max(30).nullable(),
  name: z.string().min(1).max(200),
  note: z.string().max(300).nullable(),
  raw_text: z.string().max(500),
  section_heading: z.string().max(200).nullable()
});

const StepSchema = z.object({
  position: z.number().int().positive(),
  text: z.string().min(1).max(4000)
});

const PatchSchema = z
  .object({
    title: z.string().min(1).max(200).optional(),
    description: z.string().max(2000).nullable().optional(),
    servings_default: z.number().int().nonnegative().nullable().optional(),
    servings_unit: z.string().max(30).nullable().optional(),
    prep_time_min: z.number().int().nonnegative().nullable().optional(),
    cook_time_min: z.number().int().nonnegative().nullable().optional(),
    total_time_min: z.number().int().nonnegative().nullable().optional(),
    cuisine: z.string().max(60).nullable().optional(),
    category: z.string().max(60).nullable().optional(),
    ingredients: z.array(IngredientSchema).optional(),
    steps: z.array(StepSchema).optional(),
    hidden_from_recent: z.boolean().optional()
  })
  .refine((v) => Object.keys(v).length > 0, { message: 'Empty patch' });

export const GET: RequestHandler = async ({ params }) => {
  const id = parsePositiveIntParam(params.id, 'id');
  const db = getDb();
  const recipe = getRecipeById(db, id);
  if (!recipe) error(404, { message: 'Recipe not found' });
  const ratings = listRatings(db, id);
  const comments = listComments(db, id);
  const cooking_log = listCookingLog(db, id);
  const avg_stars =
    ratings.length === 0 ? null : ratings.reduce((s, r) => s + r.stars, 0) / ratings.length;
  return json({ recipe, ratings, comments, cooking_log, avg_stars });
};

export const PATCH: RequestHandler = async ({ params, request }) => {
  const id = parsePositiveIntParam(params.id, 'id');
  const body = await request.json().catch(() => null);
  const p = validateBody(body, PatchSchema);
  const db = getDb();
  // Spezielle Kurz-Updates (bleiben als Sonderfall, weil sie FTS triggern
  // bzw. andere Tabellen mitpflegen).
  if (p.title !== undefined && Object.keys(p).length === 1) {
    renameRecipe(db, id, p.title);
    return json({ ok: true });
  }
  if (p.hidden_from_recent !== undefined && Object.keys(p).length === 1) {
    setRecipeHiddenFromRecent(db, id, p.hidden_from_recent);
    return json({ ok: true });
  }
  // Voller Edit-Modus-Patch.
  const hasMeta =
    p.title !== undefined ||
    p.description !== undefined ||
    p.servings_default !== undefined ||
    p.servings_unit !== undefined ||
    p.prep_time_min !== undefined ||
    p.cook_time_min !== undefined ||
    p.total_time_min !== undefined ||
    p.cuisine !== undefined ||
    p.category !== undefined;
  if (hasMeta) {
    updateRecipeMeta(db, id, {
      title: p.title,
      description: p.description,
      servings_default: p.servings_default,
      servings_unit: p.servings_unit,
      prep_time_min: p.prep_time_min,
      cook_time_min: p.cook_time_min,
      total_time_min: p.total_time_min,
      cuisine: p.cuisine,
      category: p.category
    });
  }
  if (p.ingredients !== undefined) {
    replaceIngredients(db, id, p.ingredients);
  }
  if (p.steps !== undefined) {
    replaceSteps(db, id, p.steps);
  }
  if (p.hidden_from_recent !== undefined) {
    setRecipeHiddenFromRecent(db, id, p.hidden_from_recent);
  }
  return json({ ok: true, recipe: getRecipeById(db, id) });
};

export const DELETE: RequestHandler = async ({ params }) => {
  const id = parsePositiveIntParam(params.id, 'id');
  deleteRecipe(getDb(), id);
  return json({ ok: true });
};