-- ============================================================
-- OxiCloud Unified Database Schema
-- For clean installations: psql -f db/schema.sql
-- ============================================================
-- Order: auth (base) → caldav → carddav
-- All tables use IF NOT EXISTS for idempotent re-runs.
-- ============================================================

-- ============================================================
-- 1. AUTH SCHEMA
-- ============================================================
CREATE SCHEMA IF NOT EXISTS auth;

-- Create UserRole enum type
DO $BODY$ 
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_type t
        JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
        WHERE t.typname = 'userrole' AND n.nspname = 'auth'
    ) THEN
        CREATE TYPE auth.userrole AS ENUM ('admin', 'user');
    END IF;
END $BODY$;

-- Users table
CREATE TABLE IF NOT EXISTS auth.users (
    id VARCHAR(36) PRIMARY KEY,
    username TEXT UNIQUE NOT NULL,
    email TEXT UNIQUE NOT NULL,
    password_hash TEXT NOT NULL,
    role auth.userrole NOT NULL,
    storage_quota_bytes BIGINT NOT NULL DEFAULT 10737418240, -- 10GB default
    storage_used_bytes BIGINT NOT NULL DEFAULT 0,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    last_login_at TIMESTAMP WITH TIME ZONE,
    active BOOLEAN NOT NULL DEFAULT TRUE
);

CREATE INDEX IF NOT EXISTS idx_users_username ON auth.users(username);
CREATE INDEX IF NOT EXISTS idx_users_email ON auth.users(email);

-- Sessions table for refresh tokens
CREATE TABLE IF NOT EXISTS auth.sessions (
    id VARCHAR(36) PRIMARY KEY,
    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    refresh_token TEXT NOT NULL UNIQUE,
    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
    ip_address TEXT,
    user_agent TEXT,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    revoked BOOLEAN NOT NULL DEFAULT FALSE
);

CREATE INDEX IF NOT EXISTS idx_sessions_user_id ON auth.sessions(user_id);
CREATE INDEX IF NOT EXISTS idx_sessions_refresh_token ON auth.sessions(refresh_token);
CREATE INDEX IF NOT EXISTS idx_sessions_expires_at ON auth.sessions(expires_at);

CREATE OR REPLACE FUNCTION auth.is_session_active(expires_at timestamptz)
RETURNS boolean AS $$
BEGIN
  RETURN expires_at > now();
END;
$$ LANGUAGE plpgsql IMMUTABLE;

CREATE INDEX IF NOT EXISTS idx_sessions_active ON auth.sessions(user_id, revoked)
WHERE NOT revoked AND auth.is_session_active(expires_at);

-- File ownership tracking
CREATE TABLE IF NOT EXISTS auth.user_files (
    id SERIAL PRIMARY KEY,
    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    file_path TEXT NOT NULL,
    file_id TEXT NOT NULL,
    size_bytes BIGINT NOT NULL DEFAULT 0,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(user_id, file_path)
);

CREATE INDEX IF NOT EXISTS idx_user_files_user_id ON auth.user_files(user_id);
CREATE INDEX IF NOT EXISTS idx_user_files_file_id ON auth.user_files(file_id);

-- User favorites
CREATE TABLE IF NOT EXISTS auth.user_favorites (
    id SERIAL PRIMARY KEY,
    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    item_id TEXT NOT NULL,
    item_type TEXT NOT NULL, -- 'file' or 'folder'
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(user_id, item_id, item_type)
);

CREATE INDEX IF NOT EXISTS idx_user_favorites_user_id ON auth.user_favorites(user_id);
CREATE INDEX IF NOT EXISTS idx_user_favorites_item_id ON auth.user_favorites(item_id);
CREATE INDEX IF NOT EXISTS idx_user_favorites_type ON auth.user_favorites(item_type);
CREATE INDEX IF NOT EXISTS idx_user_favorites_created ON auth.user_favorites(created_at);
CREATE INDEX IF NOT EXISTS idx_user_favorites_user_type ON auth.user_favorites(user_id, item_type);

-- Recent files
CREATE TABLE IF NOT EXISTS auth.user_recent_files (
    id SERIAL PRIMARY KEY,
    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    item_id TEXT NOT NULL,
    item_type TEXT NOT NULL, -- 'file' or 'folder'
    accessed_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(user_id, item_id, item_type)
);

CREATE INDEX IF NOT EXISTS idx_user_recent_user_id ON auth.user_recent_files(user_id);
CREATE INDEX IF NOT EXISTS idx_user_recent_item_id ON auth.user_recent_files(item_id);
CREATE INDEX IF NOT EXISTS idx_user_recent_type ON auth.user_recent_files(item_type);
CREATE INDEX IF NOT EXISTS idx_user_recent_accessed ON auth.user_recent_files(accessed_at);
CREATE INDEX IF NOT EXISTS idx_user_recent_user_accessed ON auth.user_recent_files(user_id, accessed_at DESC);

COMMENT ON TABLE auth.users IS 'Stores user account information';
COMMENT ON TABLE auth.sessions IS 'Stores user session information for refresh tokens';
COMMENT ON TABLE auth.user_files IS 'Tracks file ownership and storage utilization by users';
COMMENT ON TABLE auth.user_favorites IS 'Stores user favorite files and folders for cross-device synchronization';
COMMENT ON TABLE auth.user_recent_files IS 'Stores recently accessed files and folders for cross-device synchronization';

-- NOTE: No default users are created. The first user to register through
-- the admin setup wizard will become the administrator.

-- ============================================================
-- 2. CALDAV SCHEMA (RFC 4791)
-- ============================================================
CREATE SCHEMA IF NOT EXISTS caldav;

-- Calendars
CREATE TABLE IF NOT EXISTS caldav.calendars (
    id UUID PRIMARY KEY,
    name TEXT NOT NULL,
    owner_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    description TEXT,
    color VARCHAR(9), -- #RRGGBB or #RRGGBBAA
    is_public BOOLEAN NOT NULL DEFAULT FALSE,
    ctag VARCHAR(64) NOT NULL DEFAULT '0',
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_calendars_owner_id ON caldav.calendars(owner_id);

-- Calendar events (VEVENT)
CREATE TABLE IF NOT EXISTS caldav.calendar_events (
    id UUID PRIMARY KEY,
    calendar_id UUID NOT NULL REFERENCES caldav.calendars(id) ON DELETE CASCADE,
    summary TEXT NOT NULL,
    description TEXT,
    location TEXT,
    start_time TIMESTAMP WITH TIME ZONE NOT NULL,
    end_time TIMESTAMP WITH TIME ZONE NOT NULL,
    all_day BOOLEAN NOT NULL DEFAULT FALSE,
    rrule TEXT,
    ical_uid VARCHAR(255) NOT NULL,
    ical_data TEXT, -- Full iCalendar data for round-trip fidelity
    etag VARCHAR(64),
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_calendar_events_calendar_id ON caldav.calendar_events(calendar_id);
CREATE INDEX IF NOT EXISTS idx_calendar_events_ical_uid ON caldav.calendar_events(ical_uid);
CREATE INDEX IF NOT EXISTS idx_calendar_events_time_range ON caldav.calendar_events(calendar_id, start_time, end_time);

-- Calendar sharing
CREATE TABLE IF NOT EXISTS caldav.calendar_shares (
    id SERIAL PRIMARY KEY,
    calendar_id UUID NOT NULL REFERENCES caldav.calendars(id) ON DELETE CASCADE,
    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    access_level VARCHAR(10) NOT NULL DEFAULT 'read', -- read, write, owner
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(calendar_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_calendar_shares_calendar_id ON caldav.calendar_shares(calendar_id);
CREATE INDEX IF NOT EXISTS idx_calendar_shares_user_id ON caldav.calendar_shares(user_id);

-- Calendar custom properties
CREATE TABLE IF NOT EXISTS caldav.calendar_properties (
    id SERIAL PRIMARY KEY,
    calendar_id UUID NOT NULL REFERENCES caldav.calendars(id) ON DELETE CASCADE,
    property_name TEXT NOT NULL,
    property_value TEXT NOT NULL,
    UNIQUE(calendar_id, property_name)
);

CREATE INDEX IF NOT EXISTS idx_calendar_properties_calendar_id ON caldav.calendar_properties(calendar_id);

COMMENT ON TABLE caldav.calendars IS 'CalDAV calendars for each user';
COMMENT ON TABLE caldav.calendar_events IS 'Calendar events (VEVENT) stored with iCal data';
COMMENT ON TABLE caldav.calendar_shares IS 'Calendar sharing permissions between users';
COMMENT ON TABLE caldav.calendar_properties IS 'Custom WebDAV properties on calendars';

-- ============================================================
-- 3. CARDDAV SCHEMA (RFC 6352)
-- ============================================================
CREATE SCHEMA IF NOT EXISTS carddav;

-- Address books
CREATE TABLE IF NOT EXISTS carddav.address_books (
    id UUID PRIMARY KEY,
    name TEXT NOT NULL,
    owner_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    description TEXT,
    color VARCHAR(9),
    is_public BOOLEAN NOT NULL DEFAULT FALSE,
    ctag VARCHAR(64) NOT NULL DEFAULT '0',
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_address_books_owner_id ON carddav.address_books(owner_id);

-- Contacts
CREATE TABLE IF NOT EXISTS carddav.contacts (
    id UUID PRIMARY KEY,
    address_book_id UUID NOT NULL REFERENCES carddav.address_books(id) ON DELETE CASCADE,
    uid VARCHAR(255) NOT NULL,
    full_name TEXT,
    first_name TEXT,
    last_name TEXT,
    nickname TEXT,
    organization TEXT,
    title TEXT,
    notes TEXT,
    photo_url TEXT,
    birthday DATE,
    anniversary DATE,
    email JSONB NOT NULL DEFAULT '[]',
    phone JSONB NOT NULL DEFAULT '[]',
    address JSONB NOT NULL DEFAULT '[]',
    vcard TEXT, -- Full vCard data for round-trip fidelity
    etag VARCHAR(64) NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_contacts_address_book_id ON carddav.contacts(address_book_id);
CREATE INDEX IF NOT EXISTS idx_contacts_uid ON carddav.contacts(uid);
CREATE INDEX IF NOT EXISTS idx_contacts_full_name ON carddav.contacts(full_name);

-- Address book sharing
CREATE TABLE IF NOT EXISTS carddav.address_book_shares (
    id SERIAL PRIMARY KEY,
    address_book_id UUID NOT NULL REFERENCES carddav.address_books(id) ON DELETE CASCADE,
    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
    can_write BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(address_book_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_address_book_shares_address_book_id ON carddav.address_book_shares(address_book_id);
CREATE INDEX IF NOT EXISTS idx_address_book_shares_user_id ON carddav.address_book_shares(user_id);

-- Contact groups
CREATE TABLE IF NOT EXISTS carddav.contact_groups (
    id UUID PRIMARY KEY,
    address_book_id UUID NOT NULL REFERENCES carddav.address_books(id) ON DELETE CASCADE,
    name TEXT NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_contact_groups_address_book_id ON carddav.contact_groups(address_book_id);

-- Group memberships
CREATE TABLE IF NOT EXISTS carddav.group_memberships (
    id SERIAL PRIMARY KEY,
    group_id UUID NOT NULL REFERENCES carddav.contact_groups(id) ON DELETE CASCADE,
    contact_id UUID NOT NULL REFERENCES carddav.contacts(id) ON DELETE CASCADE,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(group_id, contact_id)
);

CREATE INDEX IF NOT EXISTS idx_group_memberships_group_id ON carddav.group_memberships(group_id);
CREATE INDEX IF NOT EXISTS idx_group_memberships_contact_id ON carddav.group_memberships(contact_id);

COMMENT ON TABLE carddav.address_books IS 'CardDAV address books for each user';
COMMENT ON TABLE carddav.contacts IS 'Contacts stored with vCard data for round-trip fidelity';
COMMENT ON TABLE carddav.address_book_shares IS 'Address book sharing permissions between users';
COMMENT ON TABLE carddav.contact_groups IS 'Contact groups within address books';
COMMENT ON TABLE carddav.group_memberships IS 'Many-to-many relationship between contacts and groups';