-- Migration: user_topic_preferences and reading_history
-- Timestamp: 20260402050000

-- ============================================================
-- 1. TABLES
-- ============================================================

-- User Topic Preferences: tracks topics a user is interested in, updated per article view
CREATE TABLE IF NOT EXISTS public.user_topic_preferences (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    topic TEXT NOT NULL,
    view_count INTEGER DEFAULT 1,
    last_viewed_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);

-- Reading History: tracks articles a user has viewed
CREATE TABLE IF NOT EXISTS public.reading_history (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    article_slug TEXT NOT NULL,
    article_title TEXT NOT NULL,
    article_excerpt TEXT,
    article_image TEXT,
    article_image_alt TEXT,
    article_category TEXT,
    article_author TEXT,
    article_read_time TEXT,
    article_date TEXT,
    viewed_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);

-- ============================================================
-- 2. INDEXES
-- ============================================================

CREATE INDEX IF NOT EXISTS idx_user_topic_preferences_user_id ON public.user_topic_preferences(user_id);
CREATE UNIQUE INDEX IF NOT EXISTS idx_user_topic_preferences_user_topic ON public.user_topic_preferences(user_id, topic);

CREATE INDEX IF NOT EXISTS idx_reading_history_user_id ON public.reading_history(user_id);
CREATE INDEX IF NOT EXISTS idx_reading_history_article_slug ON public.reading_history(article_slug);
CREATE UNIQUE INDEX IF NOT EXISTS idx_reading_history_user_article ON public.reading_history(user_id, article_slug);

-- ============================================================
-- 3. ENABLE RLS
-- ============================================================

ALTER TABLE public.user_topic_preferences ENABLE ROW LEVEL SECURITY;
ALTER TABLE public.reading_history ENABLE ROW LEVEL SECURITY;

-- ============================================================
-- 4. RLS POLICIES
-- ============================================================

-- User Topic Preferences: users manage their own preferences
DROP POLICY IF EXISTS "users_manage_own_topic_preferences" ON public.user_topic_preferences;
CREATE POLICY "users_manage_own_topic_preferences"
ON public.user_topic_preferences
FOR ALL
TO authenticated
USING (user_id = auth.uid())
WITH CHECK (user_id = auth.uid());

-- Reading History: users manage their own reading history
DROP POLICY IF EXISTS "users_manage_own_reading_history" ON public.reading_history;
CREATE POLICY "users_manage_own_reading_history"
ON public.reading_history
FOR ALL
TO authenticated
USING (user_id = auth.uid())
WITH CHECK (user_id = auth.uid());