-- Newsletter subscribers and campaign send log
CREATE TABLE IF NOT EXISTS newsletter_subscribers (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  email TEXT NOT NULL COLLATE NOCASE,
  status TEXT NOT NULL CHECK (status IN ('pending', 'active', 'unsubscribed')),
  locale TEXT NOT NULL DEFAULT 'it',
  confirm_token TEXT,
  unsubscribe_token TEXT NOT NULL,
  source TEXT NOT NULL DEFAULT 'footer',
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  confirmed_at TEXT,
  unsubscribed_at TEXT,
  UNIQUE (email)
);

CREATE INDEX IF NOT EXISTS idx_newsletter_subscribers_status
  ON newsletter_subscribers (status);

CREATE INDEX IF NOT EXISTS idx_newsletter_subscribers_confirm_token
  ON newsletter_subscribers (confirm_token);

CREATE INDEX IF NOT EXISTS idx_newsletter_subscribers_unsubscribe_token
  ON newsletter_subscribers (unsubscribe_token);

CREATE TABLE IF NOT EXISTS newsletter_campaigns (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  subject TEXT NOT NULL,
  body_text TEXT NOT NULL,
  body_html TEXT,
  status TEXT NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'sending', 'sent', 'failed')),
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  sent_at TEXT,
  created_by TEXT
);

CREATE TABLE IF NOT EXISTS newsletter_campaign_sends (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  campaign_id INTEGER NOT NULL,
  subscriber_id INTEGER NOT NULL,
  email TEXT NOT NULL,
  status TEXT NOT NULL CHECK (status IN ('queued', 'sent', 'failed', 'skipped')),
  error TEXT,
  sent_at TEXT,
  FOREIGN KEY (campaign_id) REFERENCES newsletter_campaigns (id),
  FOREIGN KEY (subscriber_id) REFERENCES newsletter_subscribers (id)
);

CREATE INDEX IF NOT EXISTS idx_newsletter_campaign_sends_campaign
  ON newsletter_campaign_sends (campaign_id);