-- =============================================================
-- ARCHIVO: 21-inventory.sql
-- DESCRIPCION: Niveles de stock y movimientos de inventario
-- VERSION: 1.0.0
-- PROYECTO: ERP-Core V2
-- FECHA: 2026-01-13
-- DEPENDE DE: 17-products.sql, 18-warehouses.sql
-- =============================================================

-- =====================
-- SCHEMA: inventory (ya creado en 18-warehouses.sql)
-- =====================

-- =====================
-- TABLA: stock_levels
-- Niveles de inventario por producto/almacen/ubicacion
-- =====================
CREATE TABLE IF NOT EXISTS inventory.stock_levels (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
    product_id UUID NOT NULL REFERENCES products.products(id) ON DELETE CASCADE,
    warehouse_id UUID NOT NULL REFERENCES inventory.warehouses(id) ON DELETE CASCADE,
    location_id UUID REFERENCES inventory.warehouse_locations(id) ON DELETE SET NULL,

    -- Cantidades
    quantity_on_hand DECIMAL(15, 4) NOT NULL DEFAULT 0,    -- Cantidad fisica disponible
    quantity_reserved DECIMAL(15, 4) NOT NULL DEFAULT 0,   -- Reservada para ordenes
    quantity_available DECIMAL(15, 4) GENERATED ALWAYS AS (quantity_on_hand - quantity_reserved) STORED,
    quantity_incoming DECIMAL(15, 4) NOT NULL DEFAULT 0,   -- En transito/por recibir
    quantity_outgoing DECIMAL(15, 4) NOT NULL DEFAULT 0,   -- Por enviar

    -- Lote y serie
    lot_number VARCHAR(50),
    serial_number VARCHAR(50),
    expiry_date DATE,

    -- Costo
    unit_cost DECIMAL(15, 4),
    total_cost DECIMAL(15, 4),

    -- Ultima actividad
    last_movement_at TIMESTAMPTZ,
    last_count_at TIMESTAMPTZ,

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,

    UNIQUE(product_id, warehouse_id, COALESCE(location_id, '00000000-0000-0000-0000-000000000000'::UUID), COALESCE(lot_number, ''), COALESCE(serial_number, ''))
);

-- Indices para stock_levels
CREATE INDEX IF NOT EXISTS idx_stock_levels_tenant ON inventory.stock_levels(tenant_id);
CREATE INDEX IF NOT EXISTS idx_stock_levels_product ON inventory.stock_levels(product_id);
CREATE INDEX IF NOT EXISTS idx_stock_levels_warehouse ON inventory.stock_levels(warehouse_id);
CREATE INDEX IF NOT EXISTS idx_stock_levels_location ON inventory.stock_levels(location_id);
CREATE INDEX IF NOT EXISTS idx_stock_levels_lot ON inventory.stock_levels(lot_number);
CREATE INDEX IF NOT EXISTS idx_stock_levels_serial ON inventory.stock_levels(serial_number);
CREATE INDEX IF NOT EXISTS idx_stock_levels_expiry ON inventory.stock_levels(expiry_date) WHERE expiry_date IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_stock_levels_low_stock ON inventory.stock_levels(quantity_on_hand) WHERE quantity_on_hand <= 0;
CREATE INDEX IF NOT EXISTS idx_stock_levels_available ON inventory.stock_levels(quantity_available);

-- =====================
-- TABLA: stock_movements
-- Movimientos de inventario (entradas, salidas, transferencias, ajustes)
-- =====================
CREATE TABLE IF NOT EXISTS inventory.stock_movements (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,

    -- Tipo de movimiento
    movement_type VARCHAR(20) NOT NULL, -- receipt, shipment, transfer, adjustment, return, production, consumption
    movement_number VARCHAR(30) NOT NULL, -- Numero secuencial

    -- Producto
    product_id UUID NOT NULL REFERENCES products.products(id) ON DELETE RESTRICT,

    -- Origen y destino
    source_warehouse_id UUID REFERENCES inventory.warehouses(id),
    source_location_id UUID REFERENCES inventory.warehouse_locations(id),
    dest_warehouse_id UUID REFERENCES inventory.warehouses(id),
    dest_location_id UUID REFERENCES inventory.warehouse_locations(id),

    -- Cantidad
    quantity DECIMAL(15, 4) NOT NULL,
    uom VARCHAR(20) DEFAULT 'PZA',

    -- Lote y serie
    lot_number VARCHAR(50),
    serial_number VARCHAR(50),
    expiry_date DATE,

    -- Costo
    unit_cost DECIMAL(15, 4),
    total_cost DECIMAL(15, 4),

    -- Referencia
    reference_type VARCHAR(30),  -- sales_order, purchase_order, transfer_order, adjustment, return
    reference_id UUID,
    reference_number VARCHAR(50),

    -- Razon (para ajustes)
    reason VARCHAR(100),
    notes TEXT,

    -- Estado
    status VARCHAR(20) NOT NULL DEFAULT 'draft', -- draft, confirmed, cancelled
    confirmed_at TIMESTAMPTZ,
    confirmed_by UUID REFERENCES auth.users(id),

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    created_by UUID REFERENCES auth.users(id),
    updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    deleted_at TIMESTAMPTZ
);

-- Indices para stock_movements
CREATE INDEX IF NOT EXISTS idx_stock_movements_tenant ON inventory.stock_movements(tenant_id);
CREATE INDEX IF NOT EXISTS idx_stock_movements_type ON inventory.stock_movements(movement_type);
CREATE INDEX IF NOT EXISTS idx_stock_movements_number ON inventory.stock_movements(movement_number);
CREATE INDEX IF NOT EXISTS idx_stock_movements_product ON inventory.stock_movements(product_id);
CREATE INDEX IF NOT EXISTS idx_stock_movements_source ON inventory.stock_movements(source_warehouse_id);
CREATE INDEX IF NOT EXISTS idx_stock_movements_dest ON inventory.stock_movements(dest_warehouse_id);
CREATE INDEX IF NOT EXISTS idx_stock_movements_status ON inventory.stock_movements(status);
CREATE INDEX IF NOT EXISTS idx_stock_movements_reference ON inventory.stock_movements(reference_type, reference_id);
CREATE INDEX IF NOT EXISTS idx_stock_movements_date ON inventory.stock_movements(created_at);
CREATE INDEX IF NOT EXISTS idx_stock_movements_lot ON inventory.stock_movements(lot_number) WHERE lot_number IS NOT NULL;

-- =====================
-- TABLA: inventory_counts
-- Conteos fisicos de inventario
-- =====================
CREATE TABLE IF NOT EXISTS inventory.inventory_counts (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
    warehouse_id UUID NOT NULL REFERENCES inventory.warehouses(id) ON DELETE CASCADE,

    -- Identificacion
    count_number VARCHAR(30) NOT NULL,
    name VARCHAR(100),

    -- Tipo de conteo
    count_type VARCHAR(20) DEFAULT 'full', -- full, partial, cycle, spot

    -- Fecha programada
    scheduled_date DATE,
    started_at TIMESTAMPTZ,
    completed_at TIMESTAMPTZ,

    -- Estado
    status VARCHAR(20) NOT NULL DEFAULT 'draft', -- draft, in_progress, completed, cancelled

    -- Responsable
    assigned_to UUID REFERENCES auth.users(id),

    -- Notas
    notes TEXT,

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    created_by UUID REFERENCES auth.users(id),
    updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);

-- Indices para inventory_counts
CREATE INDEX IF NOT EXISTS idx_inventory_counts_tenant ON inventory.inventory_counts(tenant_id);
CREATE INDEX IF NOT EXISTS idx_inventory_counts_warehouse ON inventory.inventory_counts(warehouse_id);
CREATE INDEX IF NOT EXISTS idx_inventory_counts_status ON inventory.inventory_counts(status);
CREATE INDEX IF NOT EXISTS idx_inventory_counts_date ON inventory.inventory_counts(scheduled_date);

-- =====================
-- TABLA: inventory_count_lines
-- Lineas de conteo de inventario
-- =====================
CREATE TABLE IF NOT EXISTS inventory.inventory_count_lines (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    count_id UUID NOT NULL REFERENCES inventory.inventory_counts(id) ON DELETE CASCADE,
    product_id UUID NOT NULL REFERENCES products.products(id) ON DELETE RESTRICT,
    location_id UUID REFERENCES inventory.warehouse_locations(id),

    -- Cantidades
    system_quantity DECIMAL(15, 4),     -- Cantidad segun sistema
    counted_quantity DECIMAL(15, 4),    -- Cantidad contada
    difference DECIMAL(15, 4) GENERATED ALWAYS AS (COALESCE(counted_quantity, 0) - COALESCE(system_quantity, 0)) STORED,

    -- Lote y serie
    lot_number VARCHAR(50),
    serial_number VARCHAR(50),

    -- Estado
    is_counted BOOLEAN DEFAULT FALSE,
    counted_at TIMESTAMPTZ,
    counted_by UUID REFERENCES auth.users(id),

    -- Notas
    notes TEXT,

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);

-- Indices para inventory_count_lines
CREATE INDEX IF NOT EXISTS idx_inventory_count_lines_count ON inventory.inventory_count_lines(count_id);
CREATE INDEX IF NOT EXISTS idx_inventory_count_lines_product ON inventory.inventory_count_lines(product_id);
CREATE INDEX IF NOT EXISTS idx_inventory_count_lines_location ON inventory.inventory_count_lines(location_id);
CREATE INDEX IF NOT EXISTS idx_inventory_count_lines_counted ON inventory.inventory_count_lines(is_counted);

-- =====================
-- TABLA: transfer_orders
-- Ordenes de transferencia entre almacenes
-- =====================
CREATE TABLE IF NOT EXISTS inventory.transfer_orders (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,

    -- Identificacion
    transfer_number VARCHAR(30) NOT NULL,

    -- Origen y destino
    source_warehouse_id UUID NOT NULL REFERENCES inventory.warehouses(id),
    dest_warehouse_id UUID NOT NULL REFERENCES inventory.warehouses(id),

    -- Fechas
    scheduled_date DATE,
    shipped_at TIMESTAMPTZ,
    received_at TIMESTAMPTZ,

    -- Estado
    status VARCHAR(20) NOT NULL DEFAULT 'draft', -- draft, confirmed, shipped, in_transit, received, cancelled

    -- Notas
    notes TEXT,

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    created_by UUID REFERENCES auth.users(id),
    updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    deleted_at TIMESTAMPTZ,

    UNIQUE(tenant_id, transfer_number)
);

-- Indices para transfer_orders
CREATE INDEX IF NOT EXISTS idx_transfer_orders_tenant ON inventory.transfer_orders(tenant_id);
CREATE INDEX IF NOT EXISTS idx_transfer_orders_source ON inventory.transfer_orders(source_warehouse_id);
CREATE INDEX IF NOT EXISTS idx_transfer_orders_dest ON inventory.transfer_orders(dest_warehouse_id);
CREATE INDEX IF NOT EXISTS idx_transfer_orders_status ON inventory.transfer_orders(status);
CREATE INDEX IF NOT EXISTS idx_transfer_orders_date ON inventory.transfer_orders(scheduled_date);

-- =====================
-- TABLA: transfer_order_lines
-- Lineas de orden de transferencia
-- =====================
CREATE TABLE IF NOT EXISTS inventory.transfer_order_lines (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    transfer_id UUID NOT NULL REFERENCES inventory.transfer_orders(id) ON DELETE CASCADE,
    product_id UUID NOT NULL REFERENCES products.products(id) ON DELETE RESTRICT,

    -- Ubicaciones especificas
    source_location_id UUID REFERENCES inventory.warehouse_locations(id),
    dest_location_id UUID REFERENCES inventory.warehouse_locations(id),

    -- Cantidades
    quantity_requested DECIMAL(15, 4) NOT NULL,
    quantity_shipped DECIMAL(15, 4) DEFAULT 0,
    quantity_received DECIMAL(15, 4) DEFAULT 0,

    -- Lote y serie
    lot_number VARCHAR(50),
    serial_number VARCHAR(50),

    -- Notas
    notes TEXT,

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);

-- Indices para transfer_order_lines
CREATE INDEX IF NOT EXISTS idx_transfer_order_lines_transfer ON inventory.transfer_order_lines(transfer_id);
CREATE INDEX IF NOT EXISTS idx_transfer_order_lines_product ON inventory.transfer_order_lines(product_id);

-- =====================
-- COMENTARIOS
-- =====================
COMMENT ON TABLE inventory.stock_levels IS 'Niveles actuales de inventario por producto/almacen/ubicacion';
COMMENT ON COLUMN inventory.stock_levels.quantity_on_hand IS 'Cantidad fisica disponible en el almacen';
COMMENT ON COLUMN inventory.stock_levels.quantity_reserved IS 'Cantidad reservada para ordenes pendientes';
COMMENT ON COLUMN inventory.stock_levels.quantity_available IS 'Cantidad disponible para venta (on_hand - reserved)';
COMMENT ON COLUMN inventory.stock_levels.quantity_incoming IS 'Cantidad en transito o por recibir';

COMMENT ON TABLE inventory.stock_movements IS 'Historial de movimientos de inventario';
COMMENT ON COLUMN inventory.stock_movements.movement_type IS 'Tipo: receipt (entrada), shipment (salida), transfer, adjustment, return, production, consumption';
COMMENT ON COLUMN inventory.stock_movements.status IS 'Estado: draft, confirmed, cancelled';

COMMENT ON TABLE inventory.inventory_counts IS 'Conteos fisicos de inventario para reconciliacion';
COMMENT ON COLUMN inventory.inventory_counts.count_type IS 'Tipo: full (completo), partial, cycle (ciclico), spot (aleatorio)';

COMMENT ON TABLE inventory.transfer_orders IS 'Ordenes de transferencia entre almacenes';
COMMENT ON COLUMN inventory.transfer_orders.status IS 'Estado: draft, confirmed, shipped, in_transit, received, cancelled';

-- =====================
-- TABLA: lots
-- Lotes de productos para trazabilidad y control de caducidad
-- Coherencia: lot.entity.ts
-- =====================
CREATE TABLE IF NOT EXISTS inventory.lots (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
    product_id UUID NOT NULL REFERENCES products.products(id) ON DELETE CASCADE,

    -- Identificacion
    name VARCHAR(100) NOT NULL,
    ref VARCHAR(100),

    -- Fechas de control
    manufacture_date DATE,
    expiration_date DATE,
    removal_date DATE,
    alert_date DATE,

    -- Notas
    notes TEXT,

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    created_by UUID REFERENCES auth.users(id),

    UNIQUE(product_id, name)
);

-- Indices para lots
CREATE INDEX IF NOT EXISTS idx_lots_tenant ON inventory.lots(tenant_id);
CREATE INDEX IF NOT EXISTS idx_lots_product ON inventory.lots(product_id);
CREATE INDEX IF NOT EXISTS idx_lots_name_product ON inventory.lots(product_id, name);
CREATE INDEX IF NOT EXISTS idx_lots_expiration ON inventory.lots(expiration_date) WHERE expiration_date IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_lots_alert ON inventory.lots(alert_date) WHERE alert_date IS NOT NULL;

-- =====================
-- TIPO ENUM: picking_type
-- =====================
DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'picking_type_enum') THEN
        CREATE TYPE inventory.picking_type_enum AS ENUM ('incoming', 'outgoing', 'internal');
    END IF;
END$$;

-- =====================
-- TIPO ENUM: move_status
-- =====================
DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'move_status_enum') THEN
        CREATE TYPE inventory.move_status_enum AS ENUM ('draft', 'waiting', 'confirmed', 'assigned', 'done', 'cancelled');
    END IF;
END$$;

-- =====================
-- TABLA: pickings
-- Operaciones de recepcion, envio y movimientos internos
-- Coherencia: picking.entity.ts
-- =====================
CREATE TABLE IF NOT EXISTS inventory.pickings (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
    company_id UUID NOT NULL REFERENCES auth.companies(id) ON DELETE CASCADE,

    -- Identificacion
    name VARCHAR(100) NOT NULL,

    -- Tipo de operacion
    picking_type inventory.picking_type_enum NOT NULL,

    -- Ubicaciones
    location_id UUID NOT NULL REFERENCES inventory.warehouse_locations(id),
    location_dest_id UUID NOT NULL REFERENCES inventory.warehouse_locations(id),

    -- Partner (proveedor/cliente)
    partner_id UUID REFERENCES partners.partners(id),

    -- Fechas
    scheduled_date TIMESTAMPTZ,
    date_done TIMESTAMPTZ,

    -- Origen (referencia documento)
    origin VARCHAR(255),

    -- Estado
    status inventory.move_status_enum NOT NULL DEFAULT 'draft',

    -- Notas
    notes TEXT,

    -- Validacion
    validated_at TIMESTAMPTZ,
    validated_by UUID REFERENCES auth.users(id),

    -- Metadata
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    created_by UUID REFERENCES auth.users(id),
    updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    updated_by UUID REFERENCES auth.users(id)
);

-- Indices para pickings
CREATE INDEX IF NOT EXISTS idx_pickings_tenant ON inventory.pickings(tenant_id);
CREATE INDEX IF NOT EXISTS idx_pickings_company ON inventory.pickings(company_id);
CREATE INDEX IF NOT EXISTS idx_pickings_status ON inventory.pickings(status);
CREATE INDEX IF NOT EXISTS idx_pickings_partner ON inventory.pickings(partner_id) WHERE partner_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_pickings_scheduled ON inventory.pickings(scheduled_date);
CREATE INDEX IF NOT EXISTS idx_pickings_type ON inventory.pickings(picking_type);

-- =====================
-- COMENTARIOS ADICIONALES
-- =====================
COMMENT ON TABLE inventory.lots IS 'Lotes de productos para trazabilidad, control de caducidad y FIFO/FEFO';
COMMENT ON COLUMN inventory.lots.name IS 'Numero o nombre del lote (debe ser unico por producto)';
COMMENT ON COLUMN inventory.lots.expiration_date IS 'Fecha de caducidad del lote';
COMMENT ON COLUMN inventory.lots.alert_date IS 'Fecha para alerta previa a caducidad';

COMMENT ON TABLE inventory.pickings IS 'Operaciones de recepcion (incoming), envio (outgoing) y movimientos internos';
COMMENT ON COLUMN inventory.pickings.picking_type IS 'Tipo: incoming (recepcion), outgoing (envio), internal (transferencia interna)';
COMMENT ON COLUMN inventory.pickings.status IS 'Estado: draft, waiting, confirmed, assigned, done, cancelled';
COMMENT ON COLUMN inventory.pickings.origin IS 'Documento origen (ej: PO-2026-001, SO-2026-001)';