import { z } from 'zod';

const text = (max: number) =>
  z
    .string()
    .trim()
    .max(max)
    .refine((v) => !/<\/?[a-z][^>]*>/i.test(v), 'HTML ist nicht erlaubt.');
const id = z.string().regex(/^[a-zA-Z0-9_-]{1,80}$/);
export const units = ['g', 'kg', 'ml', 'l', 'Stück', 'TL', 'EL', 'Prise', 'Bund', ''] as const;
export const imageSchema = z.union(
  [
    z.string().regex(/^\/(?:media\/[a-f0-9-]+\.webp|images\/[a-z0-9-]+\.(?:webp|jpg|svg))$/),
    z
      .url({ protocol: /^https$/ })
      .max(2048)
      .regex(/^https:\/\/[^@\s/\\]+(?:[/?#][^\s\\]*)?$/i),
  ],
  { error: 'Bitte einen lokalen Bildpfad oder eine vollständige HTTPS-Bildadresse verwenden.' },
);
export const ingredientSchema = z.object({
  id,
  name: text(160).min(1, 'Zutat benötigt einen Namen.'),
  amount: z.number().positive().max(1000000).nullable().default(null),
  unit: z.enum(units).default(''),
  section: text(80).default(''),
  note: text(200).default(''),
  optional: z.boolean().default(false),
});
export const stepSchema = z.object({
  id,
  title: text(160).default(''),
  text: text(6000).min(1, 'Schritt benötigt eine Anleitung.'),
  ingredients: z.array(id).max(100).default([]),
  images: z.array(imageSchema).max(10).default([]),
  timers: z
    .array(z.object({ id, label: text(100).min(1), seconds: z.number().int().min(1).max(172800) }))
    .max(10)
    .default([]),
});
export const recipeSchema = z
  .object({
    id: z.string().uuid().optional(),
    title: text(180).min(2, 'Titel: mindestens 2 Zeichen.'),
    subtitle: text(200).default(''),
    description: text(4000).default(''),
    image: imageSchema.or(z.literal('')).default(''),
    images: z.array(imageSchema).max(20).default([]),
    categories: z.array(text(60).min(1)).max(20).default([]),
    tags: z.array(text(60).min(1)).max(30).default([]),
    cuisine: text(80).default(''),
    difficulty: z.enum(['Einfach', 'Mittel', 'Anspruchsvoll']).default('Einfach'),
    prepMinutes: z.number().int().min(0).max(10080).default(0),
    cookMinutes: z.number().int().min(0).max(10080).default(0),
    restMinutes: z.number().int().min(0).max(10080).default(0),
    servings: z.number().positive().max(10000),
    ingredients: z.array(ingredientSchema).min(1).max(200),
    steps: z.array(stepSchema).min(1).max(100),
    tips: text(6000).default(''),
    storage: text(3000).default(''),
    nutrition: z
      .object({
        kcal: z.number().min(0),
        protein: z.number().min(0),
        carbs: z.number().min(0),
        fat: z.number().min(0),
      })
      .nullable()
      .default(null),
    published: z.boolean().default(false),
    createdAt: z.iso.datetime().optional(),
    updatedAt: z.iso.datetime().optional(),
  })
  .superRefine((r, ctx) => {
    const ids = new Set(r.ingredients.map((i) => i.id));
    if (ids.size !== r.ingredients.length)
      ctx.addIssue({
        code: 'custom',
        path: ['ingredients'],
        message: 'Zutaten-IDs müssen eindeutig sein.',
      });
    const stepIds = new Set(r.steps.map((s) => s.id));
    if (stepIds.size !== r.steps.length)
      ctx.addIssue({
        code: 'custom',
        path: ['steps'],
        message: 'Schritt-IDs müssen eindeutig sein.',
      });
    const timers = r.steps.flatMap((s) => s.timers.map((t) => t.id));
    if (new Set(timers).size !== timers.length)
      ctx.addIssue({
        code: 'custom',
        path: ['steps'],
        message: 'Timer-IDs müssen eindeutig sein.',
      });
    r.steps.forEach((s, n) => {
      const refs = [
        ...s.ingredients,
        ...Array.from(s.text.matchAll(/\{\{([^}]+)\}\}/g), (m) => m[1]),
      ];
      if (refs.some((ref) => !ids.has(ref)))
        ctx.addIssue({
          code: 'custom',
          path: ['steps', n],
          message: 'Unbekannte Zutatenreferenz.',
        });
    });
  });
export const collectionSchema = z.object({
  version: z.literal(1),
  recipes: z.array(recipeSchema).min(1).max(100),
});
export type Ingredient = z.infer<typeof ingredientSchema>;
export type Step = z.infer<typeof stepSchema>;
export type Recipe = z.infer<typeof recipeSchema>;
export type SavedRecipe = Recipe & { id: string; createdAt: string; updatedAt: string };
export const totalMinutes = (r: Recipe) => r.prepMinutes + r.cookMinutes + r.restMinutes;
export function emptyRecipe(): Recipe {
  return {
    title: '',
    subtitle: '',
    description: '',
    image: '',
    images: [],
    categories: [],
    tags: [],
    cuisine: '',
    difficulty: 'Einfach',
    prepMinutes: 10,
    cookMinutes: 20,
    restMinutes: 0,
    servings: 2,
    ingredients: [
      { id: 'i1', name: '', amount: null, unit: 'g', section: '', note: '', optional: false },
    ],
    steps: [{ id: 's1', title: '', text: '', ingredients: [], images: [], timers: [] }],
    tips: '',
    storage: '',
    nutrition: null,
    published: false,
  };
}