import type Database from 'better-sqlite3';

export type WishlistEntry = {
  recipe_id: number;
  title: string;
  image_path: string | null;
  source_domain: string | null;
  added_at: string; // earliest per recipe
  wanted_by_count: number;
  wanted_by_names: string;  // comma-joined profile names
  on_my_wishlist: 0 | 1;
  avg_stars: number | null;
};

export type SortKey = 'popular' | 'newest' | 'oldest';

export function listWishlist(
  db: Database.Database,
  activeProfileId: number | null,
  sort: SortKey = 'popular'
): WishlistEntry[] {
  const orderBy = {
    popular: 'wanted_by_count DESC, first_added DESC',
    newest: 'first_added DESC',
    oldest: 'first_added ASC'
  }[sort];

  return db
    .prepare(
      `SELECT
         w.recipe_id,
         r.title,
         r.image_path,
         r.source_domain,
         MIN(w.added_at) AS first_added,
         MIN(w.added_at) AS added_at,
         COUNT(w.profile_id) AS wanted_by_count,
         COALESCE(GROUP_CONCAT(p.name, ', '), '') AS wanted_by_names,
         CASE
           WHEN ? IS NULL THEN 0
           WHEN EXISTS (SELECT 1 FROM wishlist w2
                         WHERE w2.recipe_id = w.recipe_id AND w2.profile_id = ?)
             THEN 1
           ELSE 0
         END AS on_my_wishlist,
         (SELECT AVG(stars) FROM rating WHERE recipe_id = w.recipe_id) AS avg_stars
       FROM wishlist w
       JOIN recipe r ON r.id = w.recipe_id
       LEFT JOIN profile p ON p.id = w.profile_id
       GROUP BY w.recipe_id
       ORDER BY ${orderBy}`
    )
    .all(activeProfileId, activeProfileId) as WishlistEntry[];
}

export function listWishlistProfileIds(
  db: Database.Database,
  recipeId: number
): number[] {
  return (
    db
      .prepare('SELECT profile_id FROM wishlist WHERE recipe_id = ?')
      .all(recipeId) as { profile_id: number }[]
  ).map((r) => r.profile_id);
}

export function countWishlistRecipes(db: Database.Database): number {
  const row = db
    .prepare('SELECT COUNT(DISTINCT recipe_id) AS n FROM wishlist')
    .get() as { n: number };
  return row.n;
}

export function addToWishlist(
  db: Database.Database,
  recipeId: number,
  profileId: number
): void {
  db.prepare(
    `INSERT INTO wishlist(recipe_id, profile_id)
     VALUES (?, ?)
     ON CONFLICT(recipe_id, profile_id) DO NOTHING`
  ).run(recipeId, profileId);
}

export function removeFromWishlist(
  db: Database.Database,
  recipeId: number,
  profileId: number
): void {
  db.prepare('DELETE FROM wishlist WHERE recipe_id = ? AND profile_id = ?').run(
    recipeId,
    profileId
  );
}

export function removeFromWishlistForAll(
  db: Database.Database,
  recipeId: number
): void {
  db.prepare('DELETE FROM wishlist WHERE recipe_id = ?').run(recipeId);
}

export function isOnMyWishlist(
  db: Database.Database,
  recipeId: number,
  profileId: number
): boolean {
  return (
    db
      .prepare('SELECT 1 AS ok FROM wishlist WHERE recipe_id = ? AND profile_id = ?')
      .get(recipeId, profileId) !== undefined
  );
}