-- Add phone number and location to stores
ALTER TABLE stores
ADD COLUMN IF NOT EXISTS phone VARCHAR(20),
ADD COLUMN IF NOT EXISTS city VARCHAR(100),
ADD COLUMN IF NOT EXISTS state VARCHAR(2) DEFAULT 'AZ',
ADD COLUMN IF NOT EXISTS address TEXT;

-- Stock change history
CREATE TABLE IF NOT EXISTS stock_changes (
  id SERIAL PRIMARY KEY,
  product_id INTEGER NOT NULL REFERENCES products(id) ON DELETE CASCADE,
  store_id INTEGER NOT NULL REFERENCES stores(id) ON DELETE CASCADE,
  previous_stock BOOLEAN NOT NULL,
  current_stock BOOLEAN NOT NULL,
  changed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  notified BOOLEAN DEFAULT FALSE,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_stock_changes_product ON stock_changes(product_id);
CREATE INDEX IF NOT EXISTS idx_stock_changes_store ON stock_changes(store_id);
CREATE INDEX IF NOT EXISTS idx_stock_changes_notified ON stock_changes(notified);
CREATE INDEX IF NOT EXISTS idx_stock_changes_changed_at ON stock_changes(changed_at);

-- Customer product subscriptions
CREATE TABLE IF NOT EXISTS product_subscriptions (
  id SERIAL PRIMARY KEY,
  phone_number VARCHAR(20) NOT NULL,
  product_id INTEGER NOT NULL REFERENCES products(id) ON DELETE CASCADE,
  store_id INTEGER NOT NULL REFERENCES stores(id) ON DELETE CASCADE,
  active BOOLEAN DEFAULT TRUE,
  notify_on_restock BOOLEAN DEFAULT TRUE,
  notify_on_out_of_stock BOOLEAN DEFAULT FALSE,
  subscribed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  last_notified_at TIMESTAMP,
  unsubscribed_at TIMESTAMP,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  UNIQUE(phone_number, product_id, store_id)
);

CREATE INDEX IF NOT EXISTS idx_subscriptions_phone ON product_subscriptions(phone_number);
CREATE INDEX IF NOT EXISTS idx_subscriptions_product ON product_subscriptions(product_id);
CREATE INDEX IF NOT EXISTS idx_subscriptions_store ON product_subscriptions(store_id);
CREATE INDEX IF NOT EXISTS idx_subscriptions_active ON product_subscriptions(active);

-- Notification log
CREATE TABLE IF NOT EXISTS notification_log (
  id SERIAL PRIMARY KEY,
  subscription_id INTEGER REFERENCES product_subscriptions(id) ON DELETE SET NULL,
  stock_change_id INTEGER REFERENCES stock_changes(id) ON DELETE SET NULL,
  phone_number VARCHAR(20) NOT NULL,
  message TEXT NOT NULL,
  notification_type VARCHAR(50) NOT NULL, -- 'restock', 'out_of_stock'
  status VARCHAR(50) DEFAULT 'pending', -- 'pending', 'sent', 'failed', 'bounced'
  provider VARCHAR(50), -- 'twilio', 'aws_sns', etc.
  provider_message_id VARCHAR(255),
  error_message TEXT,
  sent_at TIMESTAMP,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_notification_log_phone ON notification_log(phone_number);
CREATE INDEX IF NOT EXISTS idx_notification_log_status ON notification_log(status);
CREATE INDEX IF NOT EXISTS idx_notification_log_type ON notification_log(notification_type);
CREATE INDEX IF NOT EXISTS idx_notification_log_created_at ON notification_log(created_at);

-- Reorder triggers (for internal system integration)
CREATE TABLE IF NOT EXISTS reorder_triggers (
  id SERIAL PRIMARY KEY,
  product_id INTEGER NOT NULL REFERENCES products(id) ON DELETE CASCADE,
  store_id INTEGER NOT NULL REFERENCES stores(id) ON DELETE CASCADE,
  stock_change_id INTEGER REFERENCES stock_changes(id) ON DELETE SET NULL,
  triggered_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  processed BOOLEAN DEFAULT FALSE,
  processed_at TIMESTAMP,
  webhook_url TEXT,
  webhook_response TEXT,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_reorder_triggers_processed ON reorder_triggers(processed);
CREATE INDEX IF NOT EXISTS idx_reorder_triggers_product ON reorder_triggers(product_id);
CREATE INDEX IF NOT EXISTS idx_reorder_triggers_store ON reorder_triggers(store_id);

-- Comments
COMMENT ON TABLE stock_changes IS 'Tracks all product stock status changes';
COMMENT ON TABLE product_subscriptions IS 'Customer subscriptions for product stock notifications';
COMMENT ON TABLE notification_log IS 'Log of all SMS notifications sent';
COMMENT ON TABLE reorder_triggers IS 'Triggers for automatic reordering system';