import type Database from 'better-sqlite3';

export type WishlistEntry = {
  recipe_id: number;
  title: string;
  image_path: string | null;
  source_domain: string | null;
  added_by_profile_id: number | null;
  added_by_name: string | null;
  added_at: string;
  like_count: number;
  liked_by_me: 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: 'like_count DESC, w.added_at DESC',
    newest: 'w.added_at DESC',
    oldest: 'w.added_at ASC'
  }[sort];

  return db
    .prepare(
      `SELECT
         w.recipe_id,
         r.title,
         r.image_path,
         r.source_domain,
         w.added_by_profile_id,
         p.name AS added_by_name,
         w.added_at,
         (SELECT COUNT(*) FROM wishlist_like wl WHERE wl.recipe_id = w.recipe_id) AS like_count,
         CASE
           WHEN ? IS NULL THEN 0
           WHEN EXISTS (SELECT 1 FROM wishlist_like wl
                         WHERE wl.recipe_id = w.recipe_id AND wl.profile_id = ?)
             THEN 1
           ELSE 0
         END AS liked_by_me,
         (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.added_by_profile_id
       ORDER BY ${orderBy}`
    )
    .all(activeProfileId, activeProfileId) as WishlistEntry[];
}

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

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

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

export function likeWish(
  db: Database.Database,
  recipeId: number,
  profileId: number
): void {
  db.prepare(
    'INSERT OR IGNORE INTO wishlist_like(recipe_id, profile_id) VALUES (?, ?)'
  ).run(recipeId, profileId);
}

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