-- Admin-authored announcements for normal users.

CREATE TABLE IF NOT EXISTS user_announcements (
    id           BIGSERIAL PRIMARY KEY,
    title        TEXT NOT NULL,
    content      TEXT NOT NULL,
    level        TEXT NOT NULL DEFAULT 'info',
    status       TEXT NOT NULL DEFAULT 'published',
    audience     TEXT NOT NULL DEFAULT 'all',
    starts_at    TEXT,
    ends_at      TEXT,
    created_at   TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::TEXT),
    updated_at   TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::TEXT),
    published_at TEXT
);

CREATE INDEX IF NOT EXISTS user_announcements_status_created_at_idx
    ON user_announcements (status, created_at);

CREATE INDEX IF NOT EXISTS user_announcements_active_window_idx
    ON user_announcements (starts_at, ends_at);

CREATE TABLE IF NOT EXISTS user_announcement_reads (
    announcement_id BIGINT NOT NULL,
    user_id         BIGINT NOT NULL,
    read_at         TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::TEXT),
    PRIMARY KEY (announcement_id, user_id),
    FOREIGN KEY (announcement_id) REFERENCES user_announcements(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);

CREATE INDEX IF NOT EXISTS user_announcement_reads_user_id_idx
    ON user_announcement_reads (user_id);