-- Migration: Create notifications table
-- Description: Stores user notifications for in-app and push notifications

CREATE TABLE IF NOT EXISTS notifications (
    id SERIAL PRIMARY KEY,
    user_id INT REFERENCES users(id) ON DELETE CASCADE,
    tenant_id VARCHAR(36),
    
    -- Notification content
    title VARCHAR(255) NOT NULL,
    message TEXT NOT NULL,
    type VARCHAR(50) NOT NULL DEFAULT 'info', -- info, success, warning, error, application, job, message
    
    -- Action/Link
    action_url VARCHAR(500),
    action_label VARCHAR(100),
    
    -- Status
    read BOOLEAN DEFAULT false,
    read_at TIMESTAMP,
    
    -- Push notification
    push_sent BOOLEAN DEFAULT false,
    push_sent_at TIMESTAMP,
    
    -- Metadata
    metadata JSONB,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- FCM device tokens for push notifications
CREATE TABLE IF NOT EXISTS fcm_tokens (
    id SERIAL PRIMARY KEY,
    user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token VARCHAR(500) NOT NULL,
    device_type VARCHAR(20), -- web, android, ios
    device_name VARCHAR(100),
    active BOOLEAN DEFAULT true,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(user_id, token)
);

-- Indexes
CREATE INDEX idx_notifications_user ON notifications(user_id);
CREATE INDEX idx_notifications_tenant ON notifications(tenant_id);
CREATE INDEX idx_notifications_read ON notifications(user_id, read);
CREATE INDEX idx_notifications_type ON notifications(type);
CREATE INDEX idx_notifications_created ON notifications(created_at DESC);
CREATE INDEX idx_fcm_tokens_user ON fcm_tokens(user_id);
CREATE INDEX idx_fcm_tokens_active ON fcm_tokens(user_id, active);

COMMENT ON TABLE notifications IS 'User notifications for in-app display and push notifications';
COMMENT ON TABLE fcm_tokens IS 'Firebase Cloud Messaging device tokens for push notifications';