CREATE EXTENSION IF NOT EXISTS pgcrypto;

CREATE TABLE IF NOT EXISTS users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    email TEXT NOT NULL UNIQUE,
    name TEXT NOT NULL,
    avatar_url TEXT,
    provider TEXT NOT NULL,
    provider_id TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    last_login_at TIMESTAMPTZ
);

CREATE UNIQUE INDEX IF NOT EXISTS users_provider_lookup_idx
    ON users (provider, provider_id);

CREATE TABLE IF NOT EXISTS conversations (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    title TEXT NOT NULL,
    model_tag TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS conversations_user_id_idx
    ON conversations (user_id);

CREATE TABLE IF NOT EXISTS messages (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    conversation_id UUID NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
    role TEXT NOT NULL,
    content TEXT NOT NULL,
    token_count INTEGER NOT NULL DEFAULT 0,
    model_tag TEXT NOT NULL,
    inference_time_ms INTEGER NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS messages_conversation_id_idx
    ON messages (conversation_id, created_at);