CREATE EXTENSION IF NOT EXISTS "pgcrypto";

CREATE TABLE IF NOT EXISTS users (
    id           UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    username     VARCHAR(32)  NOT NULL UNIQUE,
    email        VARCHAR(255) NOT NULL UNIQUE,
    password_hash TEXT        NOT NULL,
    display_name VARCHAR(50),
    bio          VARCHAR(160),
    avatar_url   TEXT,
    header_url   TEXT,
    custom_css   TEXT,
    created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at   TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS thoughts (
    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id    UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    content    VARCHAR(128) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS follows (
    follower_id  UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    following_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    PRIMARY KEY (follower_id, following_id)
);

CREATE TABLE IF NOT EXISTS top_friends (
    user_id   UUID     NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    friend_id UUID     NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    position  SMALLINT NOT NULL,
    PRIMARY KEY (user_id, friend_id),
    UNIQUE (user_id, position)
);

CREATE TABLE IF NOT EXISTS tags (
    id   SERIAL PRIMARY KEY,
    name VARCHAR(50) NOT NULL UNIQUE
);

CREATE TABLE IF NOT EXISTS thought_tags (
    thought_id UUID    NOT NULL REFERENCES thoughts(id) ON DELETE CASCADE,
    tag_id     INTEGER NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
    PRIMARY KEY (thought_id, tag_id)
);

CREATE TABLE IF NOT EXISTS api_keys (
    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id    UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    key_hash   TEXT        NOT NULL UNIQUE,
    name       VARCHAR(50) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);