-- Wird pro Tenant-Schema ausgeführt (SET search_path = tenant_<id>, public vorher)

CREATE TABLE IF NOT EXISTS campaigns (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  name TEXT NOT NULL,
  subject TEXT NOT NULL,
  html_body TEXT NOT NULL,
  plain_body TEXT NOT NULL,
  status TEXT NOT NULL DEFAULT 'draft'
    CHECK (status IN ('draft','scheduled','sending','sent','paused','cancelled')),
  scheduled_at TIMESTAMPTZ,
  cron_expression TEXT,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS campaign_recipients (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  campaign_id UUID NOT NULL REFERENCES campaigns(id) ON DELETE CASCADE,
  list_id UUID,
  segment_id UUID,
  CONSTRAINT recipient_has_one CHECK (
    (list_id IS NOT NULL AND segment_id IS NULL) OR
    (segment_id IS NOT NULL AND list_id IS NULL)
  )
);

CREATE INDEX IF NOT EXISTS idx_campaign_recipients_campaign_id ON campaign_recipients(campaign_id);

CREATE TABLE IF NOT EXISTS campaign_triggers (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  campaign_id UUID NOT NULL REFERENCES campaigns(id) ON DELETE CASCADE,
  trigger_type TEXT NOT NULL CHECK (trigger_type IN ('cron', 'event')),
  trigger_value TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_campaign_triggers_campaign_id ON campaign_triggers(campaign_id);

CREATE OR REPLACE FUNCTION update_updated_at()
RETURNS TRIGGER AS $$
BEGIN NEW.updated_at = now(); RETURN NEW; END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE TRIGGER campaigns_updated_at
  BEFORE UPDATE ON campaigns
  FOR EACH ROW EXECUTE FUNCTION update_updated_at();