CREATE EXTENSION IF NOT EXISTS ltree;

DO $$ BEGIN
	CREATE TYPE "ProgressType" AS ENUM (
		'PAGES',
		'PERCENTAGE',
		'SECONDS'
	);
EXCEPTION
	WHEN duplicate_object THEN null;
END $$;

DO $$ BEGIN
	CREATE TYPE "BookFormat" AS ENUM (
		'HARDCOVER',
		'TRADE_PAPERBACK',
		'MASS_MARKET_PAPERBACK',
		'EBOOK',
		'AUDIOBOOK'
	);
EXCEPTION
	WHEN duplicate_object THEN null;
END $$;

DO $$ BEGIN
	CREATE TYPE "ReadingStatus" AS ENUM (
		'WANT_TO_READ',
		'CURRENTLY_READING',
		'READ',
		'DNF',
		'PAUSED'
	);
EXCEPTION
	WHEN duplicate_object THEN null;
END $$;

DO $$ BEGIN
	CREATE TYPE "TierType" AS ENUM (
		'FREE',
		'NOADS',
		'ANALYTICS_PLUS',
		'PREMIUM'
	);
EXCEPTION
	WHEN duplicate_object THEN null;
END $$;

DO $$ BEGIN
	CREATE TYPE "UserRole" AS ENUM (
		'USER',
		'AGENT',
		'AUTHOR',
		'MODERATOR',
		'EDITOR',
		'PUBLISHER',
		'ADMIN'
	);
EXCEPTION
	WHEN duplicate_object THEN null;
END $$;

CREATE TABLE IF NOT EXISTS users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    email TEXT UNIQUE NOT NULL,
    username TEXT UNIQUE NOT NULL,
    display_name TEXT,
    role "UserRole" DEFAULT 'USER'::"UserRole",
    tier "TierType" DEFAULT 'FREE'::"TierType",
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
	is_enabled BOOLEAN DEFAULT TRUE
);
	
CREATE TABLE IF NOT EXISTS publishers (
	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
	name TEXT NOT NULL,
	website TEXT NOT NULL,
	created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS books (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    title TEXT NOT NULL,
    description TEXT,
    isbn_13 VARCHAR(13) UNIQUE,
	format "BookFormat" NOT NULL,
    published_year INT,
    cover_image_url TEXT,
    total_pages INT,
    total_audio_seconds INT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);
	
CREATE TABLE IF NOT EXISTS authors (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
	user_id UUID,
    name TEXT NOT NULL,
    bio TEXT,
	created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS author_agents (
	agent_id UUID NOT NULL,
	author_id UUID NOT NULL,
	PRIMARY KEY (agent_id, author_id)
);
	
CREATE TABLE IF NOT EXISTS book_authors (
	book_id UUID REFERENCES books(id) ON DELETE CASCADE,
	author_id UUID REFERENCES authors(id) ON DELETE CASCADE,
	author_order INT NOT NULL DEFAULT 0,
	PRIMARY KEY (book_id, author_id)
);

CREATE TABLE IF NOT EXISTS book_publishers (
	book_id UUID REFERENCES books(id) ON DELETE CASCADE,
	publisher_id UUID REFERENCES publishers(id) ON DELETE CASCADE,
	PRIMARY KEY (book_id, publisher_id)
);

CREATE TABLE IF NOT EXISTS author_publishers (
	publisher_id UUID NOT NULL,
	author_id UUID NOT NULL,
	PRIMARY KEY (publisher_id, author_id)
);

CREATE TABLE IF NOT EXISTS user_publishers (
	publisher_id UUID NOT NULL,
	user_id UUID NOT NULL,
	PRIMARY KEY (publisher_id, user_id)
);

CREATE TABLE IF NOT EXISTS user_books (
	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
	user_id UUID REFERENCES users(id) ON DELETE CASCADE NOT NULL,
	book_id UUID REFERENCES books(id) ON DELETE CASCADE NOT NULL,
	status "ReadingStatus" NOT NULL,
	is_favorite BOOLEAN DEFAULT FALSE,
	dnf_reason TEXT, -- Nullable, used only if status is 'DNF'
	created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
	updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
	UNIQUE (user_id, book_id)
);

CREATE TABLE IF NOT EXISTS reading_sessions (
	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
	user_book_id UUID REFERENCES user_books(id) ON DELETE CASCADE NOT NULL,
	progress_type "ProgressType" NOT NULL, -- 'PAGES', 'PERCENTAGE', 'SECONDS'
	session_start INT NOT NULL DEFAULT 0,
	session_end INT NOT NULL,
	total_progress INT NOT NULL,
	notes TEXT,
	logged_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS reviews (
	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
	user_id UUID REFERENCES users(id) ON DELETE CASCADE NOT NULL,
	book_id UUID REFERENCES books(id) ON DELETE CASCADE NOT NULL,
	overall_rating NUMERIC(3,2) CHECK (overall_rating >= 0 AND overall_rating <= 5.00), -- Allows 4.25, 4.5
	pacing_rating NUMERIC(3,2) CHECK (pacing_rating >= 0 AND pacing_rating <= 5.00),     -- Multi-dimensional
	prose_rating NUMERIC(3,2) CHECK (prose_rating >= 0 AND prose_rating <= 5.00),
	character_rating NUMERIC(3,2) CHECK (character_rating >= 0 AND character_rating <= 5.00),
	review_text TEXT,
	is_spoiler BOOLEAN DEFAULT FALSE,
	spoiler_cutoff_progress INT, -- Hides review if reader hasn't reached this page/percentage
	created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
	UNIQUE (user_id, book_id)
);

CREATE TABLE IF NOT EXISTS shelves (
	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
	user_id UUID REFERENCES users(id) ON DELETE CASCADE NOT NULL,
	name TEXT NOT NULL,
	path ltree NOT NULL,
	created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS book_shelves (
	book_id UUID REFERENCES user_books(id),
	shelf_id UUID NOT NULL REFERENCES shelves(id) ON DELETE CASCADE,
	PRIMARY KEY (book_id, shelf_id)
);

-- Database Performance Indexes
CREATE INDEX idx_user_books_user_status ON user_books(user_id, status);
CREATE INDEX idx_books_isbn ON books(isbn_13);
CREATE INDEX idx_reviews_book_rating ON reviews(book_id, overall_rating);
CREATE INDEX idx_shelves_path_gist ON shelves USING gist (path);
CREATE UNIQUE INDEX idx_user_shelf_path ON shelves (user_id, path);

GRANT usage ON SCHEMA public TO tomes_user;
GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA public TO tomes_user;