-- Chat server schema (pre-1.0 consolidated)
PRAGMA foreign_keys = ON;

-- Sessions: IRC-style sessions (no passwords, nick + optional signing key)
CREATE TABLE IF NOT EXISTS sessions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    uuid TEXT NOT NULL UNIQUE,
    nick TEXT NOT NULL UNIQUE,
    signing_key TEXT NOT NULL DEFAULT '',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    last_seen DATETIME DEFAULT CURRENT_TIMESTAMP
);
CREATE INDEX IF NOT EXISTS idx_sessions_uuid ON sessions(uuid);

-- Clients: each session can have multiple connected clients
CREATE TABLE IF NOT EXISTS clients (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    uuid TEXT NOT NULL UNIQUE,
    session_id INTEGER NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
    token TEXT NOT NULL UNIQUE,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    last_seen DATETIME DEFAULT CURRENT_TIMESTAMP
);
CREATE INDEX IF NOT EXISTS idx_clients_token ON clients(token);
CREATE INDEX IF NOT EXISTS idx_clients_session ON clients(session_id);

-- Channels
CREATE TABLE IF NOT EXISTS channels (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL UNIQUE,
    topic TEXT NOT NULL DEFAULT '',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- Channel members
CREATE TABLE IF NOT EXISTS channel_members (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    session_id INTEGER NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
    joined_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(channel_id, session_id)
);

-- Messages: IRC envelope format
CREATE TABLE IF NOT EXISTS messages (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    uuid TEXT NOT NULL UNIQUE,
    command TEXT NOT NULL DEFAULT 'PRIVMSG',
    msg_from TEXT NOT NULL DEFAULT '',
    msg_to TEXT NOT NULL DEFAULT '',
    body TEXT NOT NULL DEFAULT '[]',
    meta TEXT NOT NULL DEFAULT '{}',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);
CREATE INDEX IF NOT EXISTS idx_messages_to_id ON messages(msg_to, id);
CREATE INDEX IF NOT EXISTS idx_messages_created ON messages(created_at);

-- Per-client message queues for fan-out delivery
CREATE TABLE IF NOT EXISTS client_queues (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    client_id INTEGER NOT NULL REFERENCES clients(id) ON DELETE CASCADE,
    message_id INTEGER NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(client_id, message_id)
);
CREATE INDEX IF NOT EXISTS idx_client_queues_client ON client_queues(client_id, id);