CREATE EXTENSION IF NOT EXISTS pgcrypto;

CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    oidc_sub TEXT UNIQUE NOT NULL,
    email TEXT,
    display_name TEXT NOT NULL,
    avatar_url TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE guilds (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name TEXT NOT NULL,
    owner_user_id UUID NOT NULL REFERENCES users(id),
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE guild_members (
    guild_id UUID NOT NULL REFERENCES guilds(id) ON DELETE CASCADE,
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (guild_id, user_id)
);

CREATE TABLE channels (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    guild_id UUID NOT NULL REFERENCES guilds(id) ON DELETE CASCADE,
    name TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE messages (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    channel_id UUID NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    author_user_id UUID NOT NULL REFERENCES users(id),
    body TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_guild_members_user_id ON guild_members(user_id);
CREATE INDEX idx_channels_guild_id ON channels(guild_id);
CREATE INDEX idx_messages_channel_created_at ON messages(channel_id, created_at DESC);