import AsyncStorage from '@react-native-async-storage/async-storage';
import { Recipe } from '../types';
import { DEFAULT_RECIPES, DEFAULT_ADJUSTMENTS } from './defaultRecipes';

const CUSTOM_RECIPES_KEY = '@camrecipe_pro:custom_recipes';

export async function getCustomRecipes(): Promise<Recipe[]> {
  try {
    const data = await AsyncStorage.getItem(CUSTOM_RECIPES_KEY);
    if (!data) return [];
    return JSON.parse(data);
  } catch (error) {
    console.error('Failed to load custom recipes:', error);
    return [];
  }
}

export async function getAllRecipes(): Promise<Recipe[]> {
  const custom = await getCustomRecipes();
  // Backfill newer adjustment fields onto recipes persisted before they existed.
  const fill = (r: Recipe): Recipe => ({ ...r, adjustments: { ...DEFAULT_ADJUSTMENTS, ...r.adjustments } });
  return [...DEFAULT_RECIPES.map(fill), ...custom.map(fill)];
}

export async function saveCustomRecipe(recipe: Omit<Recipe, 'id' | 'isCustom'>): Promise<Recipe> {
  const custom = await getCustomRecipes();
  const newRecipe: Recipe = {
    ...recipe,
    id: `custom_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
    isCustom: true,
  };
  
  const updated = [...custom, newRecipe];
  await AsyncStorage.setItem(CUSTOM_RECIPES_KEY, JSON.stringify(updated));
  return newRecipe;
}

export async function deleteCustomRecipe(id: string): Promise<void> {
  const custom = await getCustomRecipes();
  const updated = custom.filter(r => r.id !== id);
  await AsyncStorage.setItem(CUSTOM_RECIPES_KEY, JSON.stringify(updated));
}