-- ============================================================================
-- OrbiQuant IA - Trading Platform
-- Schema: auth
-- File: tables/11-notifications.sql
-- Description: User notifications for alerts, trades, distributions, etc.
-- ============================================================================

CREATE TABLE auth.notifications (
  -- Primary Key
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  -- Foreign Key to Users
  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,

  -- Notification Content
  type VARCHAR(50) NOT NULL,
  title VARCHAR(255) NOT NULL,
  message TEXT NOT NULL,
  priority VARCHAR(20) NOT NULL DEFAULT 'normal',

  -- Additional Data
  data JSONB,
  action_url VARCHAR(500),
  icon_type VARCHAR(20) DEFAULT 'info',

  -- Delivery
  channels TEXT[] NOT NULL DEFAULT '{}',

  -- Read Status
  is_read BOOLEAN NOT NULL DEFAULT FALSE,
  read_at TIMESTAMPTZ,

  -- Audit
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

  -- Constraints
  CONSTRAINT valid_priority CHECK (priority IN ('low', 'normal', 'high', 'urgent')),
  CONSTRAINT valid_type CHECK (type IN (
    'alert_triggered',
    'trade_executed',
    'deposit_confirmed',
    'withdrawal_completed',
    'distribution_received',
    'system_announcement',
    'security_alert',
    'account_update'
  )),
  CONSTRAINT valid_icon_type CHECK (icon_type IN ('success', 'warning', 'error', 'info'))
);

-- Indexes for Performance
CREATE INDEX idx_notifications_user_id ON auth.notifications(user_id);
CREATE INDEX idx_notifications_created_at ON auth.notifications(created_at DESC);
CREATE INDEX idx_notifications_unread ON auth.notifications(user_id) WHERE is_read = FALSE;
CREATE INDEX idx_notifications_type ON auth.notifications(type);

-- Table Comments
COMMENT ON TABLE auth.notifications IS 'User notifications for various platform events';

-- Column Comments
COMMENT ON COLUMN auth.notifications.id IS 'Unique identifier for the notification';
COMMENT ON COLUMN auth.notifications.user_id IS 'Reference to the user receiving the notification';
COMMENT ON COLUMN auth.notifications.type IS 'Type of notification (alert_triggered, trade_executed, etc.)';
COMMENT ON COLUMN auth.notifications.title IS 'Notification title displayed to user';
COMMENT ON COLUMN auth.notifications.message IS 'Full notification message content';
COMMENT ON COLUMN auth.notifications.priority IS 'Notification priority (low, normal, high, urgent)';
COMMENT ON COLUMN auth.notifications.data IS 'Additional structured data as JSON';
COMMENT ON COLUMN auth.notifications.action_url IS 'URL to navigate when notification is clicked';
COMMENT ON COLUMN auth.notifications.icon_type IS 'Icon type to display (success, warning, error, info)';
COMMENT ON COLUMN auth.notifications.channels IS 'Delivery channels used (push, email, in_app, sms)';
COMMENT ON COLUMN auth.notifications.is_read IS 'Whether the notification has been read';
COMMENT ON COLUMN auth.notifications.read_at IS 'Timestamp when notification was read';
COMMENT ON COLUMN auth.notifications.created_at IS 'Timestamp when notification was created';