/*
Warnings:

- Added the required column `inventoryId` to the `Sales_Invoices` table without a default value. This is not possible if the table is not empty.

*/
-- AlterTable
ALTER TABLE `Sales_Invoices`
ADD COLUMN `inventoryId` INTEGER NOT NULL;

-- CreateIndex
CREATE INDEX `Sales_Invoices_inventoryId_fkey` ON `Sales_Invoices` (`inventoryId`);

-- AddForeignKey
ALTER TABLE `Sales_Invoices`
ADD CONSTRAINT `Sales_Invoices_inventoryId_fkey` FOREIGN KEY (`inventoryId`) REFERENCES `Inventories` (`id`) ON DELETE RESTRICT ON UPDATE CASCADE;

-- ------------------------------------------
-- Trigger: trg_transfer_item_after_insert
-- Event: INSERT
-- Table: Inventory_Transfer_Items
-- ------------------------------------------
DROP TRIGGER IF EXISTS `trg_transfer_item_after_insert`;

CREATE DEFINER=`pos`@`%` TRIGGER `trg_transfer_item_after_insert` AFTER INSERT ON `Inventory_Transfer_Items` FOR EACH ROW begin


    DECLARE fromInv INT;
    DECLARE toInv INT;
    DECLARE _avgCost DECIMAL(10,2);
    DECLARE latestQuantityInOrigin DECIMAL(10,2);
    DECLARE latestQuantityInDestination DECIMAL(10,2);

    SELECT fromInventoryId, toInventoryId INTO fromInv, toInv
    FROM Inventory_Transfers WHERE id = NEW.transferId;

    SELECT COALESCE(avgCost, 0), COALESCE(quantity, 0) INTO _avgCost, latestQuantityInOrigin FROM Stock_Balance
    WHERE ProductId = NEW.productId AND inventoryId = fromInv LIMIT 1;

    SELECT COALESCE(quantity, 0) INTO latestQuantityInDestination FROM Stock_Balance
    WHERE ProductId = NEW.productId AND inventoryId = toInv LIMIT 1;


    -- OUT from source
    INSERT INTO Stock_Movements
    (type, quantity, fee, totalCost, avgCost, referenceType, referenceId, productId, inventoryId, createdAt, remainedInStock)
    VALUES
        ('OUT', NEW.count,  _avgCost, _avgCost*NEW.count, _avgCost, 'INVENTORY_TRANSFER', NEW.transferId, NEW.productId, fromInv, NOW(), latestQuantityInOrigin-NEW.count);

    -- IN to destination
    INSERT INTO Stock_Movements
    (type, quantity, fee, totalCost, avgCost, referenceType, referenceId, productId, inventoryId, createdAt, remainedInStock)
    VALUES
        ('IN', NEW.count,_avgCost, _avgCost*NEW.count,_avgCost, 'INVENTORY_TRANSFER', NEW.transferId, NEW.productId, toInv, NOW(), latestQuantityInOrigin-NEW.count);
end;

-- ------------------------------------------
-- Trigger: trg_purchase_receipt_item_after_insert
-- Event: INSERT
-- Table: Purchase_Receipt_Items
-- ------------------------------------------
DROP TRIGGER IF EXISTS `trg_purchase_receipt_item_after_insert`;

CREATE DEFINER=`pos`@`%` TRIGGER `trg_purchase_receipt_item_after_insert` AFTER INSERT ON `Purchase_Receipt_Items` FOR EACH ROW BEGIN
    DECLARE latestQuantity DECIMAL(10,2) DEFAULT 0;
    DECLARE invId INT;
    DECLARE suppId INT;

    -- Get inventory & supplier from receipt
    SELECT inventoryId, supplierId
    INTO invId, suppId
    FROM Purchase_Receipts
    WHERE id = NEW.receiptId;

    -- Get current stock quantity (if exists)
    SELECT COALESCE(quantity, 0)
    INTO latestQuantity
    FROM Stock_Balance sb
    WHERE sb.inventoryId = invId
      AND sb.productId = NEW.productId
    LIMIT 1;

    -- Insert stock movement
    INSERT INTO Stock_Movements (
        type,
        quantity,
        fee,
        totalCost,
        referenceType,
        referenceId,
        productId,
        inventoryId,
        avgCost,
        supplierId,
        remainedInStock,
        createdAt
    )
    VALUES (
        'IN',
        NEW.count,
        NEW.fee,
        NEW.total,
        'PURCHASE',
        NEW.receiptId,
        NEW.productId,
        invId,
        CASE
          WHEN NEW.count = 0 THEN 0
          ELSE NEW.total / NEW.count
        END,
        suppId,
        latestQuantity + NEW.count,
        NOW()
    );
END;

-- ------------------------------------------
-- Trigger: trg_stock_transfer
-- Event: INSERT
-- Table: Stock_Movements
-- ------------------------------------------
DROP TRIGGER IF EXISTS `trg_stock_transfer`;

CREATE DEFINER=`pos`@`%` TRIGGER `trg_stock_transfer` AFTER INSERT ON `Stock_Movements` FOR EACH ROW BEGIN

  IF NEW.referenceType = 'INVENTORY_TRANSFER' THEN

    IF NEW.type = 'IN' THEN
      INSERT INTO Stock_Balance (
        productId,
        inventoryId,
        quantity,
        totalCost,
        avgCost,
        updatedAt
      )
      VALUES (
        NEW.productId,
        NEW.inventoryId,
        NEW.quantity,
        NEW.totalCost,
        CASE
          WHEN NEW.quantity = 0 THEN 0
          ELSE NEW.totalCost / NEW.quantity
        END,
        NOW()
      )
      ON DUPLICATE KEY UPDATE
        quantity = quantity + NEW.quantity,
        totalCost = totalCost + NEW.totalCost,
        avgCost = CASE
                   WHEN (quantity + NEW.quantity) = 0 THEN 0
                   ELSE (totalCost + NEW.totalCost) / (quantity + NEW.quantity)
                 END,
        updatedAt = NOW();
    END IF;


    IF NEW.type = 'OUT' THEN


      IF EXISTS(
        SELECT 1 FROM Stock_Balance sb
        WHERE sb.productId = NEW.productId
          AND sb.inventoryId = NEW.inventoryId
      ) THEN


        UPDATE Stock_Balance sb
        SET
          sb.quantity = sb.quantity - NEW.quantity,
          sb.totalCost = sb.totalCost - (sb.avgCost * NEW.quantity),
          sb.updatedAt = NOW()
        WHERE sb.productId = NEW.productId
          AND sb.inventoryId = NEW.inventoryId;

      ELSE
        INSERT INTO Stock_Balance (
          productId,
          inventoryId,
          quantity,
          totalCost,
          avgCost,
          updatedAt
        )
        VALUES (
          NEW.productId,
          NEW.inventoryId,
          -NEW.quantity,
          -COALESCE(NEW.fee, 0) * NEW.quantity,
          COALESCE(NEW.fee, 0),
          NOW()
        );
      END IF;

    END IF;

  END IF;
END;

-- ------------------------------------------
-- Trigger: trg_stock_purchase_insert
-- Event: INSERT
-- Table: Stock_Movements
-- ------------------------------------------
DROP TRIGGER IF EXISTS `trg_stock_purchase_insert`;

CREATE DEFINER=`pos`@`%` TRIGGER `trg_stock_purchase_insert` AFTER INSERT ON `Stock_Movements` FOR EACH ROW BEGIN
    IF NEW.referenceType = 'PURCHASE' THEN

        INSERT INTO Stock_Balance (productId, quantity, avgCost, totalCost, inventoryId, updatedAt)
        VALUES (
            NEW.productId,
            NEW.quantity,
            NEW.fee,
            NEW.totalCost,
            NEW.inventoryId,
            NOW()
        )
        ON DUPLICATE KEY UPDATE
            quantity = quantity + NEW.quantity,
            totalCost = totalCost + NEW.totalCost,
            avgCost = totalCost / quantity;

    END IF;
END;