-- 1. Stock summary per jenis-grade-gudang
SELECT
  it.name AS item_type,
  ig.name AS item_grade,
  w.name AS warehouse,
  SUM(il.available_qty) AS qty_total,
  SUM(il.available_qty * il.unit_cost) AS inventory_value,
  COUNT(*) FILTER (WHERE il.status = 'ACTIVE') AS active_lot_count
FROM inventory_lots il
JOIN item_types it ON it.id = il.item_type_id
JOIN item_grades ig ON ig.id = il.item_grade_id
JOIN warehouses w ON w.id = il.warehouse_id
WHERE il.status = 'ACTIVE'
GROUP BY it.name, ig.name, w.name
ORDER BY it.name, ig.name, w.name;

-- 2. Stock aging report
SELECT
  il.lot_code,
  s.name AS supplier,
  it.name AS item_type,
  ig.name AS item_grade,
  il.available_qty,
  il.unit_cost,
  il.received_at,
  DATE_PART('day', NOW() - il.received_at) AS aging_days,
  il.status
FROM inventory_lots il
LEFT JOIN suppliers s ON s.id = il.supplier_id
JOIN item_types it ON it.id = il.item_type_id
JOIN item_grades ig ON ig.id = il.item_grade_id
WHERE il.available_qty > 0
ORDER BY aging_days DESC;

-- 3. Purchase history per supplier
SELECT
  p.purchase_no,
  p.purchase_date,
  s.name AS supplier,
  COUNT(pl.id) AS total_lines,
  SUM(pl.subtotal) AS grand_total
FROM purchases p
JOIN suppliers s ON s.id = p.supplier_id
JOIN purchase_lines pl ON pl.purchase_id = p.id
GROUP BY p.id, p.purchase_no, p.purchase_date, s.name
ORDER BY p.purchase_date DESC;

-- 4. Sales margin report
SELECT
  sa.sales_no,
  sa.sales_date,
  c.name AS customer,
  SUM(sl.subtotal) AS sales_total,
  SUM(sl.costing_total) AS costing_total,
  SUM(sl.gross_margin) AS gross_margin
FROM sales sa
JOIN customers c ON c.id = sa.customer_id
JOIN sales_lines sl ON sl.sales_id = sa.id
GROUP BY sa.id, sa.sales_no, sa.sales_date, c.name
ORDER BY sa.sales_date DESC;

-- 5. Supplier quality report berdasarkan hasil sortasi
SELECT
  sup.name AS supplier,
  parent.lot_code AS source_lot,
  ss.input_qty,
  ss.output_qty,
  ss.shrinkage_qty,
  ROUND((ss.output_qty / NULLIF(ss.input_qty, 0)) * 100, 2) AS yield_percent
FROM sorting_sessions ss
JOIN inventory_lots parent ON parent.id = ss.source_lot_id
LEFT JOIN suppliers sup ON sup.id = parent.supplier_id
ORDER BY ss.sorting_date DESC;

-- 6. Shrinkage report
SELECT
  sa.adjustment_no,
  il.lot_code,
  sup.name AS supplier,
  it.name AS item_type,
  ig.name AS item_grade,
  ar.name AS reason,
  sa.qty_before,
  sa.qty_change,
  sa.qty_after,
  sa.cost_impact,
  sa.adjustment_date
FROM stock_adjustments sa
JOIN inventory_lots il ON il.id = sa.inventory_lot_id
LEFT JOIN suppliers sup ON sup.id = il.supplier_id
JOIN item_types it ON it.id = il.item_type_id
JOIN item_grades ig ON ig.id = il.item_grade_id
JOIN adjustment_reasons ar ON ar.id = sa.reason_id
ORDER BY sa.adjustment_date DESC;

-- 7. Traceability by sales
SELECT
  s.sales_no,
  c.name AS customer,
  sl.id AS sales_line_id,
  it.name AS item_type,
  ig.name AS item_grade,
  sl.qty_sold,
  il.lot_code,
  sup.name AS supplier,
  sa.qty_allocated,
  sa.unit_cost,
  sa.total_cost,
  p.purchase_no
FROM sales s
JOIN customers c ON c.id = s.customer_id
JOIN sales_lines sl ON sl.sales_id = s.id
JOIN item_types it ON it.id = sl.item_type_id
JOIN item_grades ig ON ig.id = sl.item_grade_id
JOIN sales_allocations sa ON sa.sales_line_id = sl.id
JOIN inventory_lots il ON il.id = sa.inventory_lot_id
LEFT JOIN suppliers sup ON sup.id = il.supplier_id
LEFT JOIN purchases p ON p.id = il.purchase_id
ORDER BY s.sales_no, sl.id, il.lot_code;

-- 8. Forward trace by lot
SELECT
  il.lot_code,
  sup.name AS supplier,
  s.sales_no,
  c.name AS customer,
  sa.qty_allocated,
  sa.total_cost,
  s.sales_date
FROM inventory_lots il
JOIN sales_allocations sa ON sa.inventory_lot_id = il.id
JOIN sales_lines sl ON sl.id = sa.sales_line_id
JOIN sales s ON s.id = sl.sales_id
JOIN customers c ON c.id = s.customer_id
LEFT JOIN suppliers sup ON sup.id = il.supplier_id
ORDER BY il.lot_code, s.sales_date;

-- 9. Movement ledger per lot
SELECT
  il.lot_code,
  im.movement_no,
  im.movement_type,
  im.qty_in,
  im.qty_out,
  im.balance_after,
  im.unit_cost,
  im.reference_type,
  im.reference_id,
  im.movement_date,
  u.name AS created_by
FROM inventory_movements im
JOIN inventory_lots il ON il.id = im.inventory_lot_id
JOIN users u ON u.id = im.created_by
ORDER BY il.lot_code, im.movement_date;

-- 10. Top customer by sales value
SELECT
  c.name AS customer,
  SUM(sl.subtotal) AS total_sales,
  SUM(sl.gross_margin) AS total_margin
FROM sales s
JOIN customers c ON c.id = s.customer_id
JOIN sales_lines sl ON sl.sales_id = s.id
GROUP BY c.name
ORDER BY total_sales DESC;