-- ============================================================
-- willhaben-tracker — consolidated schema (single source of truth)
-- Merged from: 01-init.sql, 02-image-and-pricing.sql, 03-global-keywords.sql
-- ============================================================

-- -----------------------------------------------------------
-- 1. users (whitelisted Telegram users)
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS users (
    id          uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    telegram_id bigint UNIQUE NOT NULL,
    username    text,
    first_name  text,
    is_admin    boolean NOT NULL DEFAULT false,
    is_active   boolean NOT NULL DEFAULT true,
    created_at  timestamptz NOT NULL DEFAULT now()
);

-- -----------------------------------------------------------
-- 2. keywords (global search keywords — deduplicated across users)
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS keywords (
    id               uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    keyword          text NOT NULL,
    interval_minutes int NOT NULL DEFAULT 60,
    is_active        boolean NOT NULL DEFAULT true,
    initial_loaded   boolean NOT NULL DEFAULT false,
    last_scraped_at  timestamptz,
    created_at       timestamptz NOT NULL DEFAULT now()
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_keywords_unique_lower
    ON keywords(LOWER(keyword));

-- -----------------------------------------------------------
-- 3. keyword_subscriptions (many-to-many: user ↔ keyword)
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS keyword_subscriptions (
    keyword_id uuid REFERENCES keywords(id) ON DELETE CASCADE NOT NULL,
    user_id    uuid REFERENCES users(id) ON DELETE CASCADE NOT NULL,
    PRIMARY KEY (keyword_id, user_id),
    created_at timestamptz NOT NULL DEFAULT now()
);

-- -----------------------------------------------------------
-- 4. ads (raw ad snapshots, globally deduplicated by wh_ad_id)
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS ads (
    id            uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    wh_ad_id      text UNIQUE NOT NULL,
    raw_json      jsonb NOT NULL,
    title         text NOT NULL,
    price         numeric,
    location      text,
    url           text,
    published_at  timestamptz,
    first_seen_at timestamptz NOT NULL DEFAULT now(),
    main_image_url text,
    postcode      text,
    modified_at   timestamptz
);

-- -----------------------------------------------------------
-- 5. price_history (track price changes per ad)
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS price_history (
    id         uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    ad_id      uuid REFERENCES ads(id) ON DELETE CASCADE NOT NULL,
    old_price  numeric NOT NULL,
    new_price  numeric NOT NULL,
    changed_at timestamptz NOT NULL DEFAULT now(),
    UNIQUE (ad_id, old_price, new_price)
);

-- -----------------------------------------------------------
-- 6. notifications (audit log of sent Telegram messages)
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS notifications (
    id         uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id    uuid REFERENCES users(id) ON DELETE CASCADE NOT NULL,
    ad_id      uuid REFERENCES ads(id) ON DELETE SET NULL,
    message_id int,
    sent_at    timestamptz NOT NULL DEFAULT now()
);

-- -----------------------------------------------------------
-- 7. scrape_logs (worker health / debugging)
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS scrape_logs (
    id            uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    keyword_id    uuid REFERENCES keywords(id) ON DELETE CASCADE NOT NULL,
    status        text NOT NULL CHECK (status IN ('success', 'error', 'rate_limited')),
    ads_found     int NOT NULL DEFAULT 0,
    new_ads       int NOT NULL DEFAULT 0,
    error_message text,
    scraped_at    timestamptz NOT NULL DEFAULT now()
);

-- ============================================================
-- Indexes
-- ============================================================

-- Keywords: fast lookup for active keywords ordered by last scrape time
CREATE INDEX IF NOT EXISTS idx_keywords_active_scraped
    ON keywords(is_active, last_scraped_at) WHERE is_active = true;

-- Keyword subscriptions: find all subscribers of a keyword
CREATE INDEX IF NOT EXISTS idx_keyword_subscriptions_user_id
    ON keyword_subscriptions(user_id);

-- Ads: fast lookup by willhaben ad ID (unique constraint already implies an index)

-- Price history: look up changes for a specific ad
CREATE INDEX IF NOT EXISTS idx_price_history_ad_id
    ON price_history(ad_id);

-- Notifications: recent messages per user
CREATE INDEX IF NOT EXISTS idx_notifications_user_sent
    ON notifications(user_id, sent_at DESC);

-- Scrape logs: latest runs per keyword
CREATE INDEX IF NOT EXISTS idx_scrape_logs_keyword_at
    ON scrape_logs(keyword_id, scraped_at DESC);