-- ============================================================================
-- SAAS LAYER - BILLING SCHEMA
-- ============================================================================
-- Version: 1.0.0
-- Description: Billing, subscriptions, and payments management for SaaS
-- Target: All ERP Suite products (POS Micro, ERP Básico, Verticales)
-- ============================================================================

-- Enable required extensions
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
CREATE EXTENSION IF NOT EXISTS "pgcrypto";

-- ============================================================================
-- SCHEMA CREATION
-- ============================================================================

CREATE SCHEMA IF NOT EXISTS saas;

SET search_path TO saas, public;

-- ============================================================================
-- ENUMS
-- ============================================================================

CREATE TYPE saas.plan_type AS ENUM (
    'pos_micro',      -- 100 MXN/mes
    'erp_basic',      -- 300 MXN/mes
    'erp_pro',        -- 500 MXN/mes
    'vertical'        -- 1000+ MXN/mes
);

CREATE TYPE saas.billing_cycle AS ENUM (
    'monthly',
    'yearly'
);

CREATE TYPE saas.subscription_status AS ENUM (
    'trial',
    'active',
    'past_due',
    'suspended',
    'cancelled',
    'expired'
);

CREATE TYPE saas.payment_status AS ENUM (
    'pending',
    'processing',
    'completed',
    'failed',
    'refunded',
    'cancelled'
);

CREATE TYPE saas.invoice_status AS ENUM (
    'draft',
    'pending',
    'paid',
    'overdue',
    'cancelled',
    'refunded'
);

CREATE TYPE saas.payment_provider AS ENUM (
    'stripe',
    'conekta',
    'oxxo',
    'transfer',
    'manual'
);

-- ============================================================================
-- TABLE 1: plans (Subscription plans)
-- ============================================================================

CREATE TABLE saas.plans (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    -- Identification
    code VARCHAR(50) UNIQUE NOT NULL,
    name VARCHAR(100) NOT NULL,
    description TEXT,

    -- Type
    plan_type saas.plan_type NOT NULL,

    -- Pricing (MXN)
    price_monthly DECIMAL(10,2) NOT NULL,
    price_yearly DECIMAL(10,2), -- Usually with discount

    -- Limits
    max_users INTEGER NOT NULL DEFAULT 1,
    max_products INTEGER DEFAULT 500,
    max_sales_per_month INTEGER DEFAULT 1000,
    max_storage_mb INTEGER DEFAULT 100,

    -- Features (JSON for flexibility)
    features JSONB NOT NULL DEFAULT '{}',

    -- Status
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    is_public BOOLEAN NOT NULL DEFAULT TRUE, -- Show in pricing page
    sort_order INTEGER DEFAULT 0,

    -- Stripe/Conekta IDs
    stripe_price_id_monthly VARCHAR(100),
    stripe_price_id_yearly VARCHAR(100),
    conekta_plan_id VARCHAR(100),

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP
);

-- ============================================================================
-- TABLE 2: plan_features (Feature definitions)
-- ============================================================================

CREATE TABLE saas.plan_features (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    plan_id UUID NOT NULL REFERENCES saas.plans(id) ON DELETE CASCADE,

    -- Feature
    feature_code VARCHAR(50) NOT NULL, -- e.g., 'accounting', 'hr', 'cfdi'
    feature_name VARCHAR(100) NOT NULL,

    -- Pricing (for add-ons)
    is_included BOOLEAN NOT NULL DEFAULT FALSE,
    addon_price_monthly DECIMAL(10,2), -- Price if add-on

    -- Status
    is_active BOOLEAN NOT NULL DEFAULT TRUE,

    CONSTRAINT uq_plan_features UNIQUE (plan_id, feature_code)
);

-- ============================================================================
-- TABLE 3: tenants (All SaaS customers)
-- ============================================================================

CREATE TABLE saas.tenants (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    -- Business info
    business_name VARCHAR(200) NOT NULL,
    legal_name VARCHAR(200),
    tax_id VARCHAR(20), -- RFC México

    -- Contact
    owner_name VARCHAR(200) NOT NULL,
    email VARCHAR(255) NOT NULL,
    phone VARCHAR(20) NOT NULL,
    whatsapp VARCHAR(20),

    -- Address
    address TEXT,
    city VARCHAR(100),
    state VARCHAR(50),
    zip_code VARCHAR(10),
    country VARCHAR(2) DEFAULT 'MX',

    -- Product reference (which product schema to use)
    product_type saas.plan_type NOT NULL,
    product_schema VARCHAR(50), -- e.g., 'pos_micro', 'erp_basic'

    -- Settings
    timezone VARCHAR(50) DEFAULT 'America/Mexico_City',
    currency VARCHAR(3) DEFAULT 'MXN',
    language VARCHAR(10) DEFAULT 'es',
    settings JSONB DEFAULT '{}',

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP,

    CONSTRAINT uq_tenants_email UNIQUE (email),
    CONSTRAINT uq_tenants_phone UNIQUE (phone)
);

CREATE INDEX idx_tenants_email ON saas.tenants(email);
CREATE INDEX idx_tenants_phone ON saas.tenants(phone);
CREATE INDEX idx_tenants_product_type ON saas.tenants(product_type);

-- ============================================================================
-- TABLE 4: subscriptions (Active subscriptions)
-- ============================================================================

CREATE TABLE saas.subscriptions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES saas.tenants(id) ON DELETE CASCADE,
    plan_id UUID NOT NULL REFERENCES saas.plans(id),

    -- Billing
    billing_cycle saas.billing_cycle NOT NULL DEFAULT 'monthly',
    current_price DECIMAL(10,2) NOT NULL,

    -- Dates
    trial_starts_at TIMESTAMP,
    trial_ends_at TIMESTAMP,
    current_period_start TIMESTAMP NOT NULL,
    current_period_end TIMESTAMP NOT NULL,
    cancelled_at TIMESTAMP,

    -- Status
    status saas.subscription_status NOT NULL DEFAULT 'trial',
    cancel_reason TEXT,

    -- External IDs
    stripe_subscription_id VARCHAR(100),
    conekta_subscription_id VARCHAR(100),

    -- Features (active add-ons)
    active_features JSONB DEFAULT '[]',

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP,

    CONSTRAINT uq_subscriptions_tenant UNIQUE (tenant_id) -- One active subscription per tenant
);

CREATE INDEX idx_subscriptions_tenant_id ON saas.subscriptions(tenant_id);
CREATE INDEX idx_subscriptions_status ON saas.subscriptions(status);
CREATE INDEX idx_subscriptions_period_end ON saas.subscriptions(current_period_end);

-- ============================================================================
-- TABLE 5: invoices (Billing invoices)
-- ============================================================================

CREATE TABLE saas.invoices (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES saas.tenants(id) ON DELETE CASCADE,
    subscription_id UUID REFERENCES saas.subscriptions(id),

    -- Invoice number
    invoice_number VARCHAR(50) NOT NULL,

    -- Dates
    invoice_date DATE NOT NULL DEFAULT CURRENT_DATE,
    due_date DATE NOT NULL,
    paid_at TIMESTAMP,

    -- Amounts
    subtotal DECIMAL(10,2) NOT NULL,
    tax_amount DECIMAL(10,2) NOT NULL DEFAULT 0,
    discount_amount DECIMAL(10,2) NOT NULL DEFAULT 0,
    total DECIMAL(10,2) NOT NULL,

    -- Currency
    currency VARCHAR(3) NOT NULL DEFAULT 'MXN',

    -- Status
    status saas.invoice_status NOT NULL DEFAULT 'draft',

    -- CFDI (Mexico)
    cfdi_uuid VARCHAR(50),
    cfdi_xml TEXT,
    cfdi_pdf_url VARCHAR(500),

    -- External IDs
    stripe_invoice_id VARCHAR(100),
    conekta_order_id VARCHAR(100),

    -- Notes
    notes TEXT,

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP,

    CONSTRAINT uq_invoices_number UNIQUE (invoice_number)
);

CREATE INDEX idx_invoices_tenant_id ON saas.invoices(tenant_id);
CREATE INDEX idx_invoices_status ON saas.invoices(status);
CREATE INDEX idx_invoices_due_date ON saas.invoices(due_date);

-- ============================================================================
-- TABLE 6: invoice_items (Invoice line items)
-- ============================================================================

CREATE TABLE saas.invoice_items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    invoice_id UUID NOT NULL REFERENCES saas.invoices(id) ON DELETE CASCADE,

    -- Description
    description VARCHAR(255) NOT NULL,

    -- Amounts
    quantity INTEGER NOT NULL DEFAULT 1,
    unit_price DECIMAL(10,2) NOT NULL,
    subtotal DECIMAL(10,2) NOT NULL,

    -- Reference
    plan_id UUID REFERENCES saas.plans(id),
    feature_code VARCHAR(50),

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_invoice_items_invoice_id ON saas.invoice_items(invoice_id);

-- ============================================================================
-- TABLE 7: payments (Payment transactions)
-- ============================================================================

CREATE TABLE saas.payments (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES saas.tenants(id) ON DELETE CASCADE,
    invoice_id UUID REFERENCES saas.invoices(id),

    -- Amount
    amount DECIMAL(10,2) NOT NULL,
    currency VARCHAR(3) NOT NULL DEFAULT 'MXN',

    -- Provider
    provider saas.payment_provider NOT NULL,
    provider_payment_id VARCHAR(100),
    provider_customer_id VARCHAR(100),

    -- Status
    status saas.payment_status NOT NULL DEFAULT 'pending',

    -- Details
    payment_method_type VARCHAR(50), -- card, oxxo, spei, etc.
    last_four VARCHAR(4),
    brand VARCHAR(20), -- visa, mastercard, etc.

    -- Error handling
    failure_code VARCHAR(50),
    failure_message TEXT,

    -- Dates
    paid_at TIMESTAMP,
    refunded_at TIMESTAMP,

    -- Metadata
    metadata JSONB DEFAULT '{}',

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP
);

CREATE INDEX idx_payments_tenant_id ON saas.payments(tenant_id);
CREATE INDEX idx_payments_invoice_id ON saas.payments(invoice_id);
CREATE INDEX idx_payments_status ON saas.payments(status);
CREATE INDEX idx_payments_provider ON saas.payments(provider);

-- ============================================================================
-- TABLE 8: payment_methods (Saved payment methods)
-- ============================================================================

CREATE TABLE saas.payment_methods (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES saas.tenants(id) ON DELETE CASCADE,

    -- Provider
    provider saas.payment_provider NOT NULL,
    provider_payment_method_id VARCHAR(100) NOT NULL,

    -- Card details (if applicable)
    card_type VARCHAR(20),
    card_brand VARCHAR(20),
    card_last_four VARCHAR(4),
    card_exp_month INTEGER,
    card_exp_year INTEGER,

    -- Status
    is_default BOOLEAN NOT NULL DEFAULT FALSE,
    is_active BOOLEAN NOT NULL DEFAULT TRUE,

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP
);

CREATE INDEX idx_payment_methods_tenant_id ON saas.payment_methods(tenant_id);

-- ============================================================================
-- TABLE 9: usage_tracking (Usage metrics for billing)
-- ============================================================================

CREATE TABLE saas.usage_tracking (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES saas.tenants(id) ON DELETE CASCADE,

    -- Period
    period_start DATE NOT NULL,
    period_end DATE NOT NULL,

    -- Metrics
    users_count INTEGER DEFAULT 0,
    products_count INTEGER DEFAULT 0,
    sales_count INTEGER DEFAULT 0,
    storage_used_mb INTEGER DEFAULT 0,
    api_calls INTEGER DEFAULT 0,

    -- WhatsApp/AI usage (billable)
    whatsapp_messages INTEGER DEFAULT 0,
    ai_tokens_used INTEGER DEFAULT 0,

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP,

    CONSTRAINT uq_usage_tracking_tenant_period UNIQUE (tenant_id, period_start, period_end)
);

CREATE INDEX idx_usage_tracking_tenant_id ON saas.usage_tracking(tenant_id);
CREATE INDEX idx_usage_tracking_period ON saas.usage_tracking(period_start, period_end);

-- ============================================================================
-- TABLE 10: support_tickets (Basic support)
-- ============================================================================

CREATE TABLE saas.support_tickets (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES saas.tenants(id) ON DELETE CASCADE,

    -- Ticket
    ticket_number VARCHAR(20) NOT NULL,
    subject VARCHAR(255) NOT NULL,
    description TEXT NOT NULL,

    -- Category
    category VARCHAR(50) NOT NULL DEFAULT 'general', -- billing, technical, feature, general
    priority VARCHAR(20) NOT NULL DEFAULT 'normal', -- low, normal, high, urgent

    -- Status
    status VARCHAR(20) NOT NULL DEFAULT 'open', -- open, in_progress, waiting, resolved, closed

    -- Assignment
    assigned_to VARCHAR(100),

    -- Resolution
    resolution TEXT,
    resolved_at TIMESTAMP,

    -- Audit
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP,

    CONSTRAINT uq_support_tickets_number UNIQUE (ticket_number)
);

CREATE INDEX idx_support_tickets_tenant_id ON saas.support_tickets(tenant_id);
CREATE INDEX idx_support_tickets_status ON saas.support_tickets(status);

-- ============================================================================
-- UTILITY FUNCTIONS
-- ============================================================================

-- Function: Update updated_at timestamp
CREATE OR REPLACE FUNCTION saas.update_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

-- Function: Generate invoice number
CREATE OR REPLACE FUNCTION saas.generate_invoice_number()
RETURNS VARCHAR AS $$
DECLARE
    v_year VARCHAR;
    v_seq INTEGER;
BEGIN
    v_year := TO_CHAR(CURRENT_DATE, 'YYYY');

    SELECT COALESCE(MAX(
        CAST(SUBSTRING(invoice_number FROM 5) AS INTEGER)
    ), 0) + 1
    INTO v_seq
    FROM saas.invoices
    WHERE invoice_number LIKE v_year || '%';

    RETURN v_year || LPAD(v_seq::TEXT, 6, '0');
END;
$$ LANGUAGE plpgsql;

-- Function: Generate ticket number
CREATE OR REPLACE FUNCTION saas.generate_ticket_number()
RETURNS VARCHAR AS $$
DECLARE
    v_date VARCHAR;
    v_seq INTEGER;
BEGIN
    v_date := TO_CHAR(CURRENT_DATE, 'YYMMDD');

    SELECT COALESCE(MAX(
        CAST(SUBSTRING(ticket_number FROM 8) AS INTEGER)
    ), 0) + 1
    INTO v_seq
    FROM saas.support_tickets
    WHERE DATE(created_at) = CURRENT_DATE;

    RETURN 'TK' || v_date || LPAD(v_seq::TEXT, 4, '0');
END;
$$ LANGUAGE plpgsql;

-- ============================================================================
-- TRIGGERS
-- ============================================================================

CREATE TRIGGER trg_plans_updated_at
    BEFORE UPDATE ON saas.plans
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

CREATE TRIGGER trg_tenants_updated_at
    BEFORE UPDATE ON saas.tenants
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

CREATE TRIGGER trg_subscriptions_updated_at
    BEFORE UPDATE ON saas.subscriptions
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

CREATE TRIGGER trg_invoices_updated_at
    BEFORE UPDATE ON saas.invoices
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

CREATE TRIGGER trg_payments_updated_at
    BEFORE UPDATE ON saas.payments
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

CREATE TRIGGER trg_payment_methods_updated_at
    BEFORE UPDATE ON saas.payment_methods
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

CREATE TRIGGER trg_usage_tracking_updated_at
    BEFORE UPDATE ON saas.usage_tracking
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

CREATE TRIGGER trg_support_tickets_updated_at
    BEFORE UPDATE ON saas.support_tickets
    FOR EACH ROW EXECUTE FUNCTION saas.update_updated_at();

-- Auto-generate invoice number
CREATE OR REPLACE FUNCTION saas.auto_invoice_number()
RETURNS TRIGGER AS $$
BEGIN
    IF NEW.invoice_number IS NULL THEN
        NEW.invoice_number := saas.generate_invoice_number();
    END IF;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER trg_invoices_auto_number
    BEFORE INSERT ON saas.invoices
    FOR EACH ROW EXECUTE FUNCTION saas.auto_invoice_number();

-- Auto-generate ticket number
CREATE OR REPLACE FUNCTION saas.auto_ticket_number()
RETURNS TRIGGER AS $$
BEGIN
    IF NEW.ticket_number IS NULL THEN
        NEW.ticket_number := saas.generate_ticket_number();
    END IF;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER trg_tickets_auto_number
    BEFORE INSERT ON saas.support_tickets
    FOR EACH ROW EXECUTE FUNCTION saas.auto_ticket_number();

-- ============================================================================
-- SEED DATA: Default plans
-- ============================================================================

INSERT INTO saas.plans (code, name, description, plan_type, price_monthly, price_yearly, max_users, max_products, max_sales_per_month, features) VALUES
-- POS Micro
('pos_micro', 'POS Micro', 'Punto de venta ultra-básico para pequeños negocios', 'pos_micro', 100.00, 1000.00, 1, 500, 1000,
 '{"offline_mode": true, "whatsapp_basic": true, "reports_basic": true}'),

-- ERP Básico
('erp_basic', 'ERP Básico', 'ERP completo pero austero para PyMEs', 'erp_basic', 300.00, 3000.00, 5, 10000, 5000,
 '{"inventory": true, "sales": true, "purchases": true, "reports": true, "multi_warehouse": false}'),

-- ERP Pro
('erp_pro', 'ERP Pro', 'ERP completo con módulos avanzados', 'erp_pro', 500.00, 5000.00, 10, 50000, 20000,
 '{"inventory": true, "sales": true, "purchases": true, "reports": true, "multi_warehouse": true, "accounting_basic": true}'),

-- Vertical (template)
('vertical_base', 'Vertical Industry', 'ERP especializado por industria', 'vertical', 1000.00, 10000.00, 20, 100000, 50000,
 '{"inventory": true, "sales": true, "purchases": true, "reports": true, "multi_warehouse": true, "accounting": true, "industry_specific": true}');

-- Feature definitions
INSERT INTO saas.plan_features (plan_id, feature_code, feature_name, is_included, addon_price_monthly) VALUES
-- POS Micro add-ons
((SELECT id FROM saas.plans WHERE code = 'pos_micro'), 'cfdi', 'Facturación CFDI', FALSE, 50.00),
((SELECT id FROM saas.plans WHERE code = 'pos_micro'), 'whatsapp_pro', 'WhatsApp Avanzado', FALSE, 100.00),

-- ERP Básico add-ons
((SELECT id FROM saas.plans WHERE code = 'erp_basic'), 'accounting', 'Contabilidad', FALSE, 150.00),
((SELECT id FROM saas.plans WHERE code = 'erp_basic'), 'hr', 'Recursos Humanos', FALSE, 100.00),
((SELECT id FROM saas.plans WHERE code = 'erp_basic'), 'cfdi', 'Facturación CFDI', FALSE, 100.00),
((SELECT id FROM saas.plans WHERE code = 'erp_basic'), 'extra_user', 'Usuario Extra', FALSE, 50.00),
((SELECT id FROM saas.plans WHERE code = 'erp_basic'), 'multi_warehouse', 'Multi-Almacén', FALSE, 100.00),

-- ERP Pro included features
((SELECT id FROM saas.plans WHERE code = 'erp_pro'), 'accounting', 'Contabilidad Básica', TRUE, NULL),
((SELECT id FROM saas.plans WHERE code = 'erp_pro'), 'multi_warehouse', 'Multi-Almacén', TRUE, NULL),
((SELECT id FROM saas.plans WHERE code = 'erp_pro'), 'cfdi', 'Facturación CFDI', FALSE, 100.00),
((SELECT id FROM saas.plans WHERE code = 'erp_pro'), 'hr', 'Recursos Humanos', FALSE, 100.00),
((SELECT id FROM saas.plans WHERE code = 'erp_pro'), 'extra_user', 'Usuario Extra', FALSE, 50.00);

-- ============================================================================
-- VIEWS
-- ============================================================================

-- View: Active subscriptions with plan details
CREATE OR REPLACE VIEW saas.active_subscriptions_view AS
SELECT
    s.id,
    s.tenant_id,
    t.business_name,
    t.email,
    p.code as plan_code,
    p.name as plan_name,
    s.billing_cycle,
    s.current_price,
    s.status,
    s.current_period_start,
    s.current_period_end,
    s.trial_ends_at,
    CASE
        WHEN s.status = 'trial' THEN s.trial_ends_at - CURRENT_TIMESTAMP
        ELSE s.current_period_end - CURRENT_TIMESTAMP
    END as time_remaining
FROM saas.subscriptions s
JOIN saas.tenants t ON s.tenant_id = t.id
JOIN saas.plans p ON s.plan_id = p.id
WHERE s.status IN ('trial', 'active', 'past_due');

-- View: Revenue by plan
CREATE OR REPLACE VIEW saas.revenue_by_plan AS
SELECT
    p.code as plan_code,
    p.name as plan_name,
    COUNT(s.id) as active_subscriptions,
    SUM(s.current_price) as monthly_revenue
FROM saas.plans p
LEFT JOIN saas.subscriptions s ON p.id = s.plan_id
    AND s.status IN ('active', 'trial')
GROUP BY p.id, p.code, p.name
ORDER BY monthly_revenue DESC NULLS LAST;

-- ============================================================================
-- COMMENTS
-- ============================================================================

COMMENT ON SCHEMA saas IS 'SaaS Layer - Billing, subscriptions, and multi-tenancy management';
COMMENT ON TABLE saas.plans IS 'Available subscription plans with pricing';
COMMENT ON TABLE saas.plan_features IS 'Features included or available as add-ons per plan';
COMMENT ON TABLE saas.tenants IS 'All SaaS customers/businesses';
COMMENT ON TABLE saas.subscriptions IS 'Active subscriptions per tenant';
COMMENT ON TABLE saas.invoices IS 'Generated invoices for billing';
COMMENT ON TABLE saas.payments IS 'Payment transactions';
COMMENT ON TABLE saas.payment_methods IS 'Saved payment methods per tenant';
COMMENT ON TABLE saas.usage_tracking IS 'Usage metrics for billing and limits';
COMMENT ON TABLE saas.support_tickets IS 'Customer support tickets';

-- ============================================================================
-- SCHEMA COMPLETE
-- ============================================================================

DO $$
BEGIN
    RAISE NOTICE 'SaaS Billing schema created successfully!';
    RAISE NOTICE 'Tables: 10 (plans, plan_features, tenants, subscriptions, invoices, invoice_items, payments, payment_methods, usage_tracking, support_tickets)';
    RAISE NOTICE 'Default plans: POS Micro (100 MXN), ERP Básico (300 MXN), ERP Pro (500 MXN), Vertical (1000+ MXN)';
END $$;