-- ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
--  Travel Recommendation DB Schema
--  Database: Cloudflare D1 (SQLite)
--  Created for: 데이터베이스 최종과제
-- ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

-- 1. 카테고리 테이블 (휴양지 / 도시)
CREATE TABLE categories (
  id         INTEGER  PRIMARY KEY AUTOINCREMENT,
  name       TEXT     NOT NULL,
  emoji      TEXT,
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- 2. 여행지 테이블 (메인 엔티티)
CREATE TABLE destinations (
  id           INTEGER  PRIMARY KEY AUTOINCREMENT,
  category_id  INTEGER  NOT NULL,
  name         TEXT     NOT NULL,
  country      TEXT     NOT NULL,
  tagline      TEXT,
  image_url    TEXT,
  best_season  TEXT,
  budget_range TEXT,
  duration     TEXT,
  created_at   DATETIME DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (category_id) REFERENCES categories(id)
);

-- 3. 여행지 하이라이트 (1:N)
CREATE TABLE highlights (
  id             INTEGER PRIMARY KEY AUTOINCREMENT,
  destination_id INTEGER NOT NULL,
  icon           TEXT,
  description    TEXT    NOT NULL,
  sort_order     INTEGER DEFAULT 0,
  FOREIGN KEY (destination_id) REFERENCES destinations(id)
    ON DELETE CASCADE
);

-- 4. 태그 테이블
CREATE TABLE tags (
  id   INTEGER PRIMARY KEY AUTOINCREMENT,
  name TEXT    NOT NULL UNIQUE
);

-- 5. 여행지-태그 연결 (N:M 관계)
CREATE TABLE destination_tags (
  destination_id INTEGER NOT NULL,
  tag_id         INTEGER NOT NULL,
  PRIMARY KEY (destination_id, tag_id),
  FOREIGN KEY (destination_id) REFERENCES destinations(id),
  FOREIGN KEY (tag_id)         REFERENCES tags(id)
);

-- 6. 사용자 테이블
CREATE TABLE users (
  id         INTEGER  PRIMARY KEY AUTOINCREMENT,
  nickname   TEXT     NOT NULL,
  email      TEXT     UNIQUE,
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- 7. 리뷰 테이블 (destinations + users 참조)
CREATE TABLE reviews (
  id             INTEGER  PRIMARY KEY AUTOINCREMENT,
  destination_id INTEGER  NOT NULL,
  user_id        INTEGER  NOT NULL,
  rating         INTEGER  CHECK(rating BETWEEN 1 AND 5),
  comment        TEXT,
  created_at     DATETIME DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (destination_id) REFERENCES destinations(id),
  FOREIGN KEY (user_id)        REFERENCES users(id)
);

-- 8. 즐겨찾기 테이블
CREATE TABLE bookmarks (
  id             INTEGER  PRIMARY KEY AUTOINCREMENT,
  user_id        INTEGER  NOT NULL,
  destination_id INTEGER  NOT NULL,
  created_at     DATETIME DEFAULT CURRENT_TIMESTAMP,
  UNIQUE (user_id, destination_id),
  FOREIGN KEY (user_id)        REFERENCES users(id),
  FOREIGN KEY (destination_id) REFERENCES destinations(id)
);

-- ─── 인덱스 ─────────────────────────────────────────
CREATE INDEX idx_dest_category ON destinations(category_id);
CREATE INDEX idx_review_dest   ON reviews(destination_id);
CREATE INDEX idx_review_user   ON reviews(user_id);
CREATE INDEX idx_bmark_user    ON bookmarks(user_id);

-- ─── 예시 INSERT ────────────────────────────────────
INSERT INTO categories (name, emoji) VALUES
  ('휴양지', '🌴'),
  ('도시',   '🏙️');

INSERT INTO destinations
  (category_id, name, country, tagline, best_season, budget_range)
VALUES
  (1, '몰디브', '몰디브', '에메랄드빛 바다의 천국', '12월~3월', '300만원~'),
  (2, '도쿄',   '일본',   '전통과 혁신의 도시',     '3월~5월',  '100만원~');

-- ─── CRUD 예시 ──────────────────────────────────────
-- SELECT: 카테고리별 여행지 조회
SELECT d.*, c.name AS category
FROM   destinations d
JOIN   categories   c ON d.category_id = c.id
WHERE  c.name = '휴양지'
ORDER BY d.created_at DESC;

-- UPDATE: 여행지 정보 수정
UPDATE destinations
SET    tagline = '새로운 설명', budget_range = '150만원~'
WHERE  id = 1;

-- DELETE: 즐겨찾기 취소
DELETE FROM bookmarks
WHERE user_id = 1 AND destination_id = 3;