CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    username VARCHAR(32) NOT NULL UNIQUE,
    email VARCHAR(255) NOT NULL UNIQUE,
    password_hash TEXT NOT NULL,
    avatar_seed VARCHAR(64) NOT NULL DEFAULT '',
    last_seen TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE friendships (
    requester_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    addressee_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    status VARCHAR(16) NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'accepted', 'blocked')),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    PRIMARY KEY (requester_id, addressee_id)
);

CREATE TABLE rooms (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(64) NOT NULL,
    owner_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    max_players INTEGER NOT NULL DEFAULT 10,
    is_public BOOLEAN NOT NULL DEFAULT TRUE,
    password_hash TEXT,
    game_version VARCHAR(32) NOT NULL DEFAULT '1.20',
    status VARCHAR(16) NOT NULL DEFAULT 'open' CHECK (status IN ('open', 'in_game', 'closed')),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE room_members (
    room_id UUID NOT NULL REFERENCES rooms(id) ON DELETE CASCADE,
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role VARCHAR(16) NOT NULL DEFAULT 'member' CHECK (role IN ('owner', 'member')),
    joined_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    PRIMARY KEY (room_id, user_id)
);

CREATE TABLE refresh_tokens (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token_hash TEXT NOT NULL UNIQUE,
    device_id VARCHAR(128),
    expires_at TIMESTAMPTZ NOT NULL,
    revoked_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE relay_sessions (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    room_id UUID REFERENCES rooms(id) ON DELETE SET NULL,
    initiator_id UUID REFERENCES users(id) ON DELETE SET NULL,
    peer_id UUID REFERENCES users(id) ON DELETE SET NULL,
    session_type VARCHAR(8) NOT NULL DEFAULT 'relay' CHECK (session_type IN ('p2p', 'relay')),
    bytes_transferred BIGINT NOT NULL DEFAULT 0,
    started_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    ended_at TIMESTAMPTZ
);

CREATE INDEX idx_friendships_addressee ON friendships(addressee_id);
CREATE INDEX idx_room_members_user ON room_members(user_id);
CREATE INDEX idx_refresh_tokens_user ON refresh_tokens(user_id);
CREATE INDEX idx_relay_sessions_room ON relay_sessions(room_id);