<?php
class MStocks extends CI_Model
{
    public function __construct()
    {
        parent::__construct();
    }
    public function isDeleteable($item_id)
    {
        $this->db->where("items_id", $item_id);
        $t = $this->db->get("tbl_salesdetails")->row();
        if ($t) return false;
        $this->db->where("items_id", $item_id);
        $t = $this->db->get("tbl_purchasedetails")->row();
        if ($t) return false;
        return true;
    }
    public function deleteOpeningStock($item_id)
    {
        $this->db->where("items_id", $item_id);
        $this->db->delete("tbl_stocks");
    }
    public function updateOpeningStock($item_id, $qty, $rate)
    {
        $this->db->where("items_id", $item_id);
        $this->db->delete("tbl_stocks");
        $this->db->insert("tbl_stocks", [
            'stocklocations_id' => 1,
            'ref_id' => 0,
            "title" => "Opening Stock",
            "items_id" => $item_id,
            "qty" => $qty,
            'price' => $rate,
            'status' => 1,
            'created_on' => date("y-m-d H:i:s")
        ]);
    }
    public function addOpeningStock($item_id, $qty, $rate)
    {
        $this->db->insert("tbl_stocks", [
            'stocklocations_id' => 1,
            'ref_id' => 0,
            "title" => "Opening Stock",
            "items_id" => $item_id,
            "qty" => $qty,
            'price' => $rate,
            'status' => 1,
            'created_on' => date("y-m-d H:i:s")
        ]);
    }
    public function getSellableItems()
    {
        $subquery = "(SELECT SUM(qty) FROM tbl_stocks WHERE item_id = tbl_items.item_id) AS total_qty";
        $this->db->select("tbl_items.*, $subquery", false);
        $this->db->having('total_qty >', 0);
        return $this->db->get("tbl_items")->result();
    }

    public function getItemSalesStock($item_id)
    {

        $this->db->where("status", 1);
        $this->db->where("items_id", $item_id);
        // $this->db->where("title='Opening Stock'");
        $Items = $this->db->get("tbl_salesdetails")->result();
        $qty = 0;
        $rate = 0;
        $nos = 0;
        foreach ($Items as $Item) {
            $qty += $Item->qty;
            $nos++;
            $rate += $Item->rate;
        }
        if($nos!=0)        $rate = $rate / $nos;
        
        $SalesStock = new stdClass;
        $SalesStock->qty = $qty;
        $SalesStock->rate = $rate;
        $SalesStock->amount = $qty * $rate;
        return $SalesStock;
    }
    public function getItemPurchaseStock($item_id)
    {

        $this->db->where("status", 1);
        $this->db->where("items_id", $item_id);
        // $this->db->where("title='Opening Stock'");
        $Items = $this->db->get("tbl_purchasedetails")->result();
        $qty = 0;
        $rate = 0;
        $nos = 0;
        foreach ($Items as $Item) {
            $qty += $Item->qty;
            $nos++;
            $rate += $Item->rate;
        }
        if($nos!=0)        $rate = $rate / $nos;
        $PurchaseStock = new stdClass;
        $PurchaseStock->qty = $qty;
        $PurchaseStock->rate = $rate;
        $PurchaseStock->amount = $qty * $rate;
        return $PurchaseStock;
    }
   
    public function getOpeningStock($item_id)
    {
        $this->db->where("status", 1);
        $this->db->where("items_id", $item_id);
        $this->db->where("title='Opening Stock'");
        $Items = $this->db->get("tbl_stocks")->result();
        $qty = 0;
        $rate = 0;
        $nos = 0;
        foreach ($Items as $Item) {
            $qty += $Item->qty;
            $nos++;
            $rate += $Item->price;
        }
        if($nos!=0)        $rate = $rate / $nos;
        $OpeningStock = new stdClass;
        $OpeningStock->qty = $qty;
        $OpeningStock->rate = $rate;
        $OpeningStock->amount = $qty * $rate;
        return $OpeningStock;
    }
    public function getClosingStock($item_id)
    {
        $OpeningStock=$this->getOpeningStock($item_id);
        $PurchaseStock=$this->getItemPurchaseStock($item_id);
        $SalesStock=$this->getItemSalesStock($item_id);
        $ClosingStock = new stdClass;
        $ClosingStock->qty =$PurchaseStock->qty+$OpeningStock->qty-$SalesStock->qty;
        $ClosingStock->rate = $PurchaseStock->rate+$OpeningStock->rate-$SalesStock->rate;
        $ClosingStock->amount = $ClosingStock->qty * $ClosingStock->rate;
        return $ClosingStock;
    }
    public function getStockItemSummary($item_id)
    {
        $this->db->where("status", 1);
        $this->db->where("items_id", $item_id);
        $Item = $this->db->get("tbl_stocks")->row();
        $qty = 0;
        $price = 0;
        $Item->Item = $this->db->where("item_id", $item_id)->get("tbl_items")->row();
        $Item->qty = $this->db->where("items_id", $item_id)->select("sum(qty) as qty")->get("tbl_stocks")->row()->qty;
        $Item->amount = $this->db->where("items_id", $item_id)->select("sum(price * qty) as amount")->get("tbl_stocks")->row()->amount;
        $Item->Unit = $this->db->where("unit_id", $Item->Item->units_id)->get("tbl_units")->row();
        $Item->Opening = $this->getOpeningStock($item_id);
        $Item->Purchase = $this->getItemPurchaseStock($item_id);
        $Item->Sales = $this->getItemSalesStock($item_id);
        $Item->Closing = $this->getClosingStock($item_id);
        return $Item;
    }
    public function getStockSummary($stocklocation_id = 0)
    {
        $this->db->where("status", 1);
        if ($stocklocation_id != 0) {
            $this->db->where("stocklocations_id", $stocklocation_id);
        }
        $StockRecords = $this->db->select("distinct(items_id) as items_id")->get("tbl_stocks")->result();
        foreach ($StockRecords as $StockRecord) {
            $StockRecord->Summary = $this->getStockItemSummary($StockRecord->items_id);
            // $StockRecord->StockLocation = $this->db->where("stocklocation_id", $StockRecord->stocklocations_id)->get("tbl_stocklocations")->row();
            $StockRecord->Item = $this->db->where("item_id", $StockRecord->items_id)->get("tbl_items")->row();
        }
        return $StockRecords;
    }
    public function getStockRecords($stocklocation_id = 0)
    {
        $this->db->where("status", 1);
        if ($stocklocation_id != 0) {
            $this->db->where("stocklocations_id", $stocklocation_id);
        }
        $StockRecords = $this->db->get("tbl_stocks")->result();
        foreach ($StockRecords as $StockRecord) {
            $StockRecord->StockLocation = $this->db->where("stocklocation_id", $StockRecord->stocklocations_id)->get("tbl_stocklocations")->row();
            $StockRecord->Item = $this->db->where("item_id", $StockRecord->items_id)->get("tbl_items")->row();
            $StockRecord->Item->Unit = $this->db->where("unit_id", $StockRecord->Item->units_id)->get("tbl_units")->row();
        }
        return $StockRecords;
    }
    public function addPurchaseToStock($PurchaseDetails)
    {
        foreach ($PurchaseDetails as $PurchaseDetail) {
            $TableData = array(
                'stocklocations_id' => 1,
                'ref_id' => $PurchaseDetail->purchases_id,
                'title' => "Purchase",
                'items_id' => $PurchaseDetail->items_id,
                'qty' => $PurchaseDetail->qty,
                'price' => $PurchaseDetail->rate,
                'status' => 1,
            );
            $this->db->insert("tbl_stocks", $TableData);
        }
    }
    public function addSalesToStock($SalesDetails)
    {
        foreach ($SalesDetails as $SalesDetail) {
            $TableData = array(
                'stocklocations_id' => 1,
                'ref_id' => $SalesDetail->sales_id,
                'title' => "Sales",
                'items_id' => $SalesDetail->items_id,
                'qty' => (-$SalesDetail->qty),
                'price' => $SalesDetail->rate,
                'status' => 1,
            );
            $this->db->insert("tbl_stocks", $TableData);
        }
    }
    public function getUnitByItemId($id)
    {
        $this->db->where('status', 1);
        $Item = $this->db->where("item_id", $id)->get("tbl_items")->row();
        $Unit = $this->db->where("unit_id", $Item->units_id)->get("tbl_units")->row();
        return $Unit;

    }
}