-- =============================================================================
-- MICHANGARRITO - 20 FEATURES (MCH-032: Feature Flags por Plan)
-- =============================================================================
-- Sistema de feature flags para controlar funcionalidades por plan/tenant
-- Permite habilitar/deshabilitar features sin deployments
-- =============================================================================

-- Categorias de features
CREATE TYPE feature_category AS ENUM (
    'core',           -- Funcionalidades core (siempre disponibles)
    'analytics',      -- Reportes y analytics
    'automation',     -- Automatizaciones
    'integrations',   -- Integraciones externas
    'ai',             -- Funcionalidades de IA
    'advanced',       -- Funcionalidades avanzadas
    'beta'            -- Features en beta
);

-- Feature flags globales (definicion)
CREATE TABLE IF NOT EXISTS features.flags (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    -- Identificacion
    key VARCHAR(100) NOT NULL UNIQUE,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    category feature_category DEFAULT 'core',

    -- Valor por defecto
    default_value BOOLEAN DEFAULT false,

    -- Planes donde esta habilitado
    plans_enabled TEXT[] DEFAULT '{}',
    -- Ejemplo: {'tiendita', 'tiendita_plus'} = habilitado para estos planes
    -- Vacio = usa default_value

    -- Control
    is_public BOOLEAN DEFAULT true,  -- Si se muestra en UI de configuracion
    requires_restart BOOLEAN DEFAULT false,  -- Si requiere reinicio del app

    -- Metadata
    metadata JSONB DEFAULT '{}',

    -- Timestamps
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX idx_features_flags_key ON features.flags(key);
CREATE INDEX idx_features_flags_category ON features.flags(category);

CREATE TRIGGER update_features_flags_updated_at
    BEFORE UPDATE ON features.flags
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

COMMENT ON TABLE features.flags IS 'Definicion de feature flags globales';
COMMENT ON COLUMN features.flags.key IS 'Identificador unico del feature (snake_case)';
COMMENT ON COLUMN features.flags.plans_enabled IS 'Array de planes donde esta habilitado';

-- Feature flags por tenant (override)
CREATE TABLE IF NOT EXISTS features.tenant_flags (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES public.tenants(id) ON DELETE CASCADE,
    flag_id UUID NOT NULL REFERENCES features.flags(id) ON DELETE CASCADE,

    -- Override
    enabled BOOLEAN NOT NULL,

    -- Razon del override
    reason TEXT,

    -- Control
    expires_at TIMESTAMPTZ,  -- Para features temporales (pruebas, demos)

    -- Audit
    created_by UUID REFERENCES auth.users(id) ON DELETE SET NULL,

    -- Timestamps
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    -- Constraints
    UNIQUE(tenant_id, flag_id)
);

CREATE INDEX idx_features_tenant_flags_tenant ON features.tenant_flags(tenant_id);
CREATE INDEX idx_features_tenant_flags_flag ON features.tenant_flags(flag_id);

CREATE TRIGGER update_features_tenant_flags_updated_at
    BEFORE UPDATE ON features.tenant_flags
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

COMMENT ON TABLE features.tenant_flags IS 'Override de feature flags por tenant';
COMMENT ON COLUMN features.tenant_flags.reason IS 'Razon del override (promo, beta tester, etc.)';
COMMENT ON COLUMN features.tenant_flags.expires_at IS 'Fecha de expiracion del override';

-- =============================================================================
-- FUNCION: Verificar si un feature esta habilitado para un tenant
-- =============================================================================

CREATE OR REPLACE FUNCTION features.is_enabled(
    p_tenant_id UUID,
    p_flag_key VARCHAR(100)
) RETURNS BOOLEAN AS $$
DECLARE
    v_flag RECORD;
    v_override RECORD;
    v_tenant_plan VARCHAR(50);
BEGIN
    -- Obtener la definicion del flag
    SELECT * INTO v_flag
    FROM features.flags
    WHERE key = p_flag_key;

    IF NOT FOUND THEN
        RETURN false;  -- Flag no existe = deshabilitado
    END IF;

    -- Buscar override para el tenant
    SELECT * INTO v_override
    FROM features.tenant_flags tf
    WHERE tf.tenant_id = p_tenant_id
      AND tf.flag_id = v_flag.id
      AND (tf.expires_at IS NULL OR tf.expires_at > NOW());

    IF FOUND THEN
        RETURN v_override.enabled;  -- Usar override
    END IF;

    -- Obtener plan del tenant
    SELECT s.plan_id INTO v_tenant_plan
    FROM subscriptions.subscriptions s
    WHERE s.tenant_id = p_tenant_id
      AND s.status = 'active'
    ORDER BY s.created_at DESC
    LIMIT 1;

    -- Verificar si el plan esta en la lista de planes habilitados
    IF v_tenant_plan IS NOT NULL AND v_flag.plans_enabled IS NOT NULL AND array_length(v_flag.plans_enabled, 1) > 0 THEN
        RETURN v_tenant_plan = ANY(v_flag.plans_enabled);
    END IF;

    -- Usar valor por defecto
    RETURN v_flag.default_value;
END;
$$ LANGUAGE plpgsql;

COMMENT ON FUNCTION features.is_enabled IS 'Verifica si un feature esta habilitado para un tenant';

-- =============================================================================
-- SEEDS: Feature flags iniciales
-- =============================================================================

INSERT INTO features.flags (key, name, description, category, default_value, plans_enabled) VALUES
    -- Core (siempre disponibles)
    ('pos_basic', 'Punto de Venta Basico', 'Registro de ventas y carrito', 'core', true, '{}'),
    ('catalog_basic', 'Catalogo Basico', 'Gestion de productos y categorias', 'core', true, '{}'),

    -- Changarrito (plan basico)
    ('inventory_basic', 'Control de Inventario', 'Stock y alertas de bajo inventario', 'core', true, ARRAY['changarrito', 'tiendita', 'tiendita_plus']),
    ('customers_basic', 'Gestion de Clientes', 'Registro y historial de clientes', 'core', true, ARRAY['changarrito', 'tiendita', 'tiendita_plus']),

    -- Tiendita (plan medio)
    ('fiados', 'Sistema de Fiados', 'Credito a clientes con recordatorios', 'advanced', false, ARRAY['tiendita', 'tiendita_plus']),
    ('whatsapp_orders', 'Pedidos por WhatsApp', 'Recibir pedidos via WhatsApp', 'integrations', false, ARRAY['tiendita', 'tiendita_plus']),
    ('ai_assistant_basic', 'Asistente IA Basico', 'Consultas y reportes via chat', 'ai', false, ARRAY['tiendita', 'tiendita_plus']),

    -- Tiendita Plus (plan premium)
    ('analytics_advanced', 'Analytics Avanzado', 'Dashboards y metricas detalladas', 'analytics', false, ARRAY['tiendita_plus']),
    ('reports_export', 'Exportacion de Reportes', 'Exportar reportes PDF/Excel/CSV', 'analytics', false, ARRAY['tiendita_plus']),
    ('webhooks', 'Webhooks', 'Notificaciones a sistemas externos', 'integrations', false, ARRAY['tiendita_plus']),
    ('multi_location', 'Multi-sucursal', 'Gestion de multiples ubicaciones', 'advanced', false, ARRAY['tiendita_plus']),
    ('ai_assistant_advanced', 'Asistente IA Avanzado', 'Predicciones y recomendaciones', 'ai', false, ARRAY['tiendita_plus']),

    -- Beta
    ('delivery_tracking', 'Tracking de Entregas', 'Seguimiento de entregas en tiempo real', 'beta', false, '{}'),
    ('marketplace', 'Marketplace Proveedores', 'Conexion con distribuidores', 'beta', false, '{}')
ON CONFLICT (key) DO UPDATE SET
    name = EXCLUDED.name,
    description = EXCLUDED.description,
    plans_enabled = EXCLUDED.plans_enabled,
    updated_at = NOW();