#!/usr/bin/env bash

# Source the common utils and the environment variable loader
source load_common_and_env.sh

# (Attempt to) take variable we need
DOMAIN=${GROCY_DOMAIN}
API_KEY=${GROCY_API_KEY}
LIST_ID=${GROCY_LIST_ID}

# Curl function for API requests
perform_curl() {
  local ROUTE=$1
  local METHOD=$2
  local DATA=${3:-""}
  if [ "$METHOD" = "GET" ]; then
    curl --silent -X 'GET' "${DOMAIN}${ROUTE}" -H 'accept: application/json' -H "GROCY-API-KEY: ${API_KEY}"
  elif [ "$METHOD" = "POST" ]; then
    curl --silent -X 'POST' "${DOMAIN}${ROUTE}" -H 'Content-Type: application/json' -H "GROCY-API-KEY: ${API_KEY}" --data-raw "$DATA"
  fi
}


# Clear the shopping list, because the api only supports adding items and it is way more cumbersome to adjust to that than just doing it from scratch each time
echo "Clearing list..."
perform_curl "/api/stock/shoppinglist/clear" "POST" "{
  \"list_id\": ${LIST_ID},
  \"done_only\": false
}"

echo "Fetching product stock..."
# Fetching product stock list
STOCK_JSON=$(perform_curl "/api/stock" "GET")
echo "$STOCK_JSON" | jq '.' > stock.json

echo "Fetching missing products..."
# Fetching missing products
MISSING_PRODUCTS_JSON=$(perform_curl "/api/stock/volatile?due_soon_days=0" "GET")
echo "$MISSING_PRODUCTS_JSON" | jq '.missing_products' > missing_products.json

# Combining lists
jq -s add stock.json missing_products.json > combined_products.json
rm stock.json missing_products.json # Cleanup

echo "Fetching items already on the default shopping list..."
# Fetch current items on the default shopping list
DEFAULT_SHOPPING_LIST_JSON=$(perform_curl "/api/objects/shopping_list??query%5B%5D=shopping_list_id%3D1" "GET")
echo "$DEFAULT_SHOPPING_LIST_JSON" > default_shopping_list.json

echo "Processing products..."
# Iterate over each product to check MaxStockAmount
jq -c '.[]' combined_products.json | while read i; do
  PRODUCT_ID=$(echo $i | jq '.product.id')
  PRODUCT_NAME=$(echo $i | jq -r '.product.name')  # Extract product name
  CURRENT_AMOUNT=$(echo $i | jq '.amount_aggregated' | sed 's/null/0/')  # Treat null as 0

  # Fetch MaxStockAmount value and convert to number if not null
  MAX_STOCK_AMOUNT_JSON=$(perform_curl "/api/userfields/products/${PRODUCT_ID}" "GET")
  MAX_STOCK_AMOUNT_RAW=$(echo "$MAX_STOCK_AMOUNT_JSON" | jq '.MaxStockAmount')

  # Check if MaxStockAmount is not null and handle accordingly
  if [ "$MAX_STOCK_AMOUNT_RAW" != "null" ]; then
    MAX_STOCK_AMOUNT=$(echo "$MAX_STOCK_AMOUNT_RAW" | jq 'tonumber')
  else
    # Use min_stock_amount from the product details if MaxStockAmount is null
    MIN_STOCK_AMOUNT=$(echo $i | jq '.product.min_stock_amount')
    MAX_STOCK_AMOUNT=$MIN_STOCK_AMOUNT  # Use Grocy internal min amount as the fallback
  fi

  # Fetch how much of the product is already on the default shopping list
  AMOUNT_ON_DEFAULT_LIST=$(jq --arg PRODUCT_ID "$PRODUCT_ID" \
    '[.[] | select(.product_id | tostring == $PRODUCT_ID) | .amount] | add' default_shopping_list.json)

  # Adjust PRODUCT_AMOUNT_TO_ADD considering the amount already on the list
  if [ -z "$AMOUNT_ON_DEFAULT_LIST" ] || [ "$AMOUNT_ON_DEFAULT_LIST" = "null" ]; then AMOUNT_ON_DEFAULT_LIST=0; fi

  # Calculate the total desired amount considering amounts on both shopping lists
  REMAINING_AMOUNT_TO_ADD=$(echo "$MAX_STOCK_AMOUNT - $CURRENT_AMOUNT - $AMOUNT_ON_DEFAULT_LIST" | bc -l)
  PRODUCT_AMOUNT_TO_ADD=$(printf "%.0f" "$REMAINING_AMOUNT_TO_ADD")

  # Handle the "-0" case by converting it to "0"
  if [ "$PRODUCT_AMOUNT_TO_ADD" == "-0" ]; then
      PRODUCT_AMOUNT_TO_ADD="0"
  fi

  if [ "$PRODUCT_AMOUNT_TO_ADD" -gt 0 ]; then
    # Original logic to add to the list if PRODUCT_AMOUNT_TO_ADD is positive
    echo "Adjusting and adding \"$PRODUCT_NAME\" (ID: $PRODUCT_ID) to the shopping list, amount: $PRODUCT_AMOUNT_TO_ADD"
    # Add or adjust the product amount on the secondary shopping list
    perform_curl "/api/stock/shoppinglist/add-product" "POST" "{
      \"product_id\": ${PRODUCT_ID},
      \"list_id\": ${LIST_ID},
      \"product_amount\": ${PRODUCT_AMOUNT_TO_ADD},
      \"note\": \"Bereits da: ${CURRENT_AMOUNT} + ${AMOUNT_ON_DEFAULT_LIST}\"
    }"
  fi
done

rm combined_products.json default_shopping_list.json # Final cleanup
echo "Process completed."