-- Migration 003: Replace UUID-based tables with simple integer-keyed
-- tables for the HTTP API.  Drops the 002 tables and recreates them.

PRAGMA foreign_keys = OFF;

DROP TABLE IF EXISTS message_queue;
DROP TABLE IF EXISTS sessions;
DROP TABLE IF EXISTS server_links;
DROP TABLE IF EXISTS messages;
DROP TABLE IF EXISTS channel_members;
DROP TABLE IF EXISTS auth_tokens;
DROP TABLE IF EXISTS channels;
DROP TABLE IF EXISTS users;

CREATE TABLE users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    nick TEXT NOT NULL UNIQUE,
    token TEXT NOT NULL UNIQUE,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    last_seen DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE 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
);

CREATE TABLE channel_members (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    joined_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(channel_id, user_id)
);

CREATE TABLE messages (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    channel_id INTEGER REFERENCES channels(id) ON DELETE CASCADE,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    content TEXT NOT NULL,
    is_dm INTEGER NOT NULL DEFAULT 0,
    dm_target_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_messages_channel ON messages(channel_id, created_at);
CREATE INDEX idx_messages_dm ON messages(user_id, dm_target_id, created_at);
CREATE INDEX idx_users_token ON users(token);

PRAGMA foreign_keys = ON;