-- ============================================
-- TEMPLATE-SAAS: Notifications
-- Schema: notifications
-- Version: 1.0.0
-- ============================================

-- Notification templates
CREATE TABLE notifications.templates (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    -- Template identification
    code VARCHAR(100) UNIQUE NOT NULL,  -- e.g., 'welcome_email', 'invoice_paid'
    name VARCHAR(200) NOT NULL,
    description TEXT,
    category VARCHAR(100),  -- 'transactional', 'marketing', 'system'

    -- Channel
    channel notifications.channel NOT NULL,

    -- Content
    subject VARCHAR(500),  -- For email
    body TEXT NOT NULL,
    body_html TEXT,  -- For email HTML version

    -- Variables (for template rendering)
    variables JSONB DEFAULT '[]'::jsonb,
    -- Example: [{"name": "user_name", "required": true}, {"name": "company", "default": "SaaS"}]

    -- Status
    is_active BOOLEAN DEFAULT TRUE,

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

-- Notifications (instances)
CREATE TABLE notifications.notifications (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,
    user_id UUID REFERENCES users.users(id) ON DELETE SET NULL,

    -- Template
    template_id UUID REFERENCES notifications.templates(id),
    template_code VARCHAR(100),

    -- Channel
    channel notifications.channel NOT NULL,

    -- Content
    subject VARCHAR(500),
    body TEXT NOT NULL,
    body_html TEXT,

    -- Recipient
    recipient_email VARCHAR(255),
    recipient_phone VARCHAR(50),
    recipient_device_token VARCHAR(500),

    -- Status
    status notifications.notification_status DEFAULT 'pending' NOT NULL,
    priority notifications.priority DEFAULT 'normal',

    -- Delivery info
    sent_at TIMESTAMPTZ,
    delivered_at TIMESTAMPTZ,
    is_read BOOLEAN DEFAULT FALSE NOT NULL,
    read_at TIMESTAMPTZ,
    failed_at TIMESTAMPTZ,
    failure_reason TEXT,

    -- Retry
    retry_count INT DEFAULT 0,
    next_retry_at TIMESTAMPTZ,

    -- Metadata
    metadata JSONB DEFAULT '{}'::jsonb,

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

-- User preferences
CREATE TABLE notifications.user_preferences (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,
    user_id UUID NOT NULL REFERENCES users.users(id) ON DELETE CASCADE,

    -- Channel preferences
    email_enabled BOOLEAN DEFAULT TRUE,
    push_enabled BOOLEAN DEFAULT TRUE,
    sms_enabled BOOLEAN DEFAULT FALSE,
    in_app_enabled BOOLEAN DEFAULT TRUE,

    -- Category preferences (JSONB)
    category_preferences JSONB DEFAULT '{}'::jsonb,
    -- Example: { "marketing": false, "transactional": true }

    -- Quiet hours
    quiet_hours_enabled BOOLEAN DEFAULT FALSE,
    quiet_hours_start TIME,
    quiet_hours_end TIME,
    quiet_hours_timezone VARCHAR(50),

    -- Digest
    digest_enabled BOOLEAN DEFAULT FALSE,
    digest_frequency VARCHAR(20),  -- 'daily', 'weekly'

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

    -- Constraints
    CONSTRAINT unique_user_preferences UNIQUE (user_id)
);

-- Indexes
CREATE INDEX idx_templates_code ON notifications.templates(code) WHERE is_active = TRUE;
CREATE INDEX idx_templates_channel ON notifications.templates(channel) WHERE is_active = TRUE;

CREATE INDEX idx_notifications_tenant ON notifications.notifications(tenant_id, created_at DESC);
CREATE INDEX idx_notifications_user ON notifications.notifications(user_id, created_at DESC);
CREATE INDEX idx_notifications_status ON notifications.notifications(status) WHERE status IN ('pending', 'sent');
CREATE INDEX idx_notifications_retry ON notifications.notifications(next_retry_at) WHERE status = 'pending' AND next_retry_at IS NOT NULL;

CREATE INDEX idx_user_preferences_user ON notifications.user_preferences(user_id);

-- RLS
ALTER TABLE notifications.notifications ENABLE ROW LEVEL SECURITY;
ALTER TABLE notifications.user_preferences ENABLE ROW LEVEL SECURITY;

CREATE POLICY notifications_tenant_isolation ON notifications.notifications
    USING (tenant_id = current_setting('app.current_tenant_id', true)::UUID);

CREATE POLICY user_preferences_tenant_isolation ON notifications.user_preferences
    USING (tenant_id = current_setting('app.current_tenant_id', true)::UUID);

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

CREATE TRIGGER trg_templates_updated_at
    BEFORE UPDATE ON notifications.templates
    FOR EACH ROW
    EXECUTE FUNCTION notifications.update_updated_at();

CREATE TRIGGER trg_user_preferences_updated_at
    BEFORE UPDATE ON notifications.user_preferences
    FOR EACH ROW
    EXECUTE FUNCTION notifications.update_updated_at();

-- Comments
COMMENT ON TABLE notifications.templates IS 'Notification templates with variables';
COMMENT ON TABLE notifications.notifications IS 'Notification instances and delivery status';
COMMENT ON TABLE notifications.user_preferences IS 'User notification preferences';