queries.sql

-- =====================================================================
-- Queries used directly by db_functions.py
-- Inventory and Supply Chain Dashboard
--
-- Table/view definitions and stored procedure bodies: see schema.sql.
-- Only the CALL statements for the two procedures are shown here.
-- =====================================================================


-- ---------------------------------------------------------------------
-- get_basic_info() -> the 6 metric cards on the Basic Information page
-- ---------------------------------------------------------------------

-- Total Suppliers
SELECT COUNT(*) AS count FROM suppliers;

-- Total Products
SELECT COUNT(*) AS count FROM products;

-- Total Categories Dealing
SELECT COUNT(DISTINCT category) AS count FROM products;

-- Total Sale Value (Last 3 Months)
SELECT COALESCE(
 ROUND(SUM(ABS(se.change_quantity) * p.price), 2),
 0
 ) AS total_sale
FROM stock_entries se
JOIN products p ON se.product_id = p.product_id
WHERE se.change_type = 'Sale'
 AND se.entry_date >= (
 SELECT DATE_SUB(MAX(entry_date), INTERVAL 3 MONTH)
 FROM stock_entries
 );

-- Total Restock Value (Last 3 Months)
SELECT ROUND(SUM(se.change_quantity * p.price), 2) AS total_restock
FROM stock_entries se
JOIN products p ON se.product_id = p.product_id
WHERE se.change_type = 'Restock'
 AND se.entry_date >= (
 SELECT DATE_SUB(MAX(entry_date), INTERVAL 3 MONTH)
 FROM stock_entries
 );

-- Below Reorder Level & No Pending Reorder
SELECT COUNT(*) AS below_reorder
FROM products p
WHERE p.stock_quantity < p.reorder_level
 AND p.product_id NOT IN (
 SELECT DISTINCT product_id
 FROM reorders
 WHERE status = 'Pending'
 );


-- ---------------------------------------------------------------------
-- get_additional_tables() -> the 3 detail tables on the Basic
-- Information page
-- ---------------------------------------------------------------------

-- Suppliers Contact Details
SELECT supplier_name, contact_name, email, phone
FROM suppliers;

-- Products with Supplier and Stock
SELECT
 p.product_name,
 s.supplier_name,
 p.stock_quantity,
 p.reorder_level
FROM products p
JOIN suppliers s ON p.supplier_id = s.supplier_id
ORDER BY p.product_name ASC;

-- Products Needing Reorder
SELECT product_name, stock_quantity, reorder_level
FROM products
WHERE stock_quantity <= reorder_level;


-- ---------------------------------------------------------------------
-- Dropdown helpers: get_categories(), get_suppliers(), get_all_products()
-- ---------------------------------------------------------------------

SELECT DISTINCT category FROM products ORDER BY category ASC;

SELECT supplier_id, supplier_name FROM suppliers ORDER BY supplier_name ASC;

SELECT product_id, product_name FROM products ORDER BY product_name ASC;


-- ---------------------------------------------------------------------
-- get_product_history(product_id) -> Product History task
-- Reads from the product_inventory_history view (see schema.sql)
-- ---------------------------------------------------------------------
SELECT *
FROM product_inventory_history
WHERE product_id = %s
ORDER BY record_date DESC;


-- ---------------------------------------------------------------------
-- place_reorder(product_id, reorder_quantity) -> Place Reorder task
-- ---------------------------------------------------------------------
INSERT INTO reorders (reorder_id, product_id, reorder_quantity, reorder_date, status)
SELECT
 MAX(reorder_id) + 1,
 %s,
 %s,
 CURRENT_DATE(),
 'Ordered'
FROM reorders;


-- ---------------------------------------------------------------------
-- get_pending_reorders() -> dropdown on the Receive Reorder task
-- ---------------------------------------------------------------------
SELECT r.reorder_id, p.product_name
FROM reorders r
JOIN products p ON r.product_id = p.product_id;


-- ---------------------------------------------------------------------
-- add_new_manual_id(...) -> Add New Product task
-- mark_reorder_as_received(reorder_id) -> Receive Reorder task
-- Full logic for both lives in the stored procedures — see schema.sql
-- ---------------------------------------------------------------------
CALL AddNewProductManualID(%s, %s, %s, %s, %s, %s);

CALL MarkreorderAsRecieved(%s);