using API.DBAccess;
using API.Models.ShoppingListModels;
using Microsoft.AspNetCore.Mvc;

namespace API.BusinessLogic
{
    public class ShoppingListLogic
    {
        private readonly ShoppingListDBAccess _dbAccess;
        private readonly RecipeDBAccess _recipeDBAccess;

        public ShoppingListLogic(ShoppingListDBAccess dbAccess, RecipeDBAccess recipeDBAccess)
        {
            _dbAccess = dbAccess;
            _recipeDBAccess = recipeDBAccess;
        }

        // Reads the current shooping list of the user
        public async Task<IActionResult> ReadShoppingList(int userId)
        {
            var user = await _dbAccess.ReadShoppingList(userId);

            return new OkObjectResult(user.ShoppingList);
        }

        // Adds an item to the shoppinglist and checks if the unit should be changed and if the name is the same as an item already on the shoppinglist
        public async Task<IActionResult> AddItemToShoppingList(ShoppingListItemDTO listItemDTO, int userId)
        {
            var user = await _dbAccess.ReadShoppingList(userId);

            List<ShoppingList> shoppingList = user.ShoppingList;

            if (shoppingList.Any(s => s.Name == listItemDTO.Name))
            {
                ShoppingList item = shoppingList.Where(s => s.Name == listItemDTO.Name).FirstOrDefault();
                shoppingList.Remove(item);

                if (item.Unit == listItemDTO.Unit)
                {
                    item.Amount += listItemDTO.Amount;
                }
                else if (item.Unit == "g" && listItemDTO.Unit == "kg")
                {
                    item.Amount = (item.Amount / 1000) + listItemDTO.Amount;
                    item.Unit = "kg";
                }
                else if (item.Unit == "ml" && listItemDTO.Unit == "l")
                {
                    item.Amount = (item.Amount / 1000) + listItemDTO.Amount;
                    item.Unit = "l";
                }
                else if (item.Unit == "dl" && listItemDTO.Unit == "l")
                {
                    item.Amount = (item.Amount / 10) + listItemDTO.Amount;
                    item.Unit = "l";
                }

                item.Checked = false;

                if (item.Unit == "g" && item.Amount >= 1000)
                {
                    item.Unit = "kg";
                    item.Amount = item.Amount / 1000;
                }
                else if (item.Unit == "ml" && item.Amount >= 1000)
                {
                    item.Unit = "l";
                    item.Amount = item.Amount / 1000;
                }
                else if (item.Unit == "dl" && item.Amount >= 10)
                {
                    item.Unit = "l";
                    item.Amount = item.Amount / 10;
                }
                user.ShoppingList.Add(item);
            }
            else
            {
                ShoppingList newItem = new ShoppingList();
                newItem.Name = listItemDTO.Name;
                newItem.Amount = listItemDTO.Amount;
                newItem.Unit = listItemDTO.Unit;
                newItem.Checked = false;

                user.ShoppingList.Add(newItem);
            }
            return await _dbAccess.UpdateShoppingList(user);
        }

        // Gets the shoppinglist and tries to find the item and when it does it checks/unchecks that item
        public async Task<IActionResult> CheckItemInShoppingList(int userId, int itemId)
        {
            var user = await _dbAccess.ReadShoppingList(userId);

            int itemIndex = user.ShoppingList.FindIndex(x => x.Id == itemId);

            user.ShoppingList[itemIndex].Checked = !user.ShoppingList[itemIndex].Checked;

            return await _dbAccess.UpdateShoppingList(user);
        }

        // Updates an item on the shopping list to what the user specified
        public async Task<IActionResult> UpdateItemInShoppingList(int userId, int itemId, ShoppingListItemDTO listItemDTO)
        {
            var user = await _dbAccess.ReadShoppingList(userId);

            int itemIndex = user.ShoppingList.FindIndex(x => x.Id == itemId);

            user.ShoppingList[itemIndex].Unit = listItemDTO.Unit;
            user.ShoppingList[itemIndex].Name = listItemDTO.Name;
            user.ShoppingList[itemIndex].Amount = listItemDTO.Amount;

            if (user.ShoppingList[itemIndex].Unit == "g" && user.ShoppingList[itemIndex].Amount >= 1000)
            {
                user.ShoppingList[itemIndex].Unit = "kg";
                user.ShoppingList[itemIndex].Amount = user.ShoppingList[itemIndex].Amount / 1000;
            }
            else if (user.ShoppingList[itemIndex].Unit == "ml" && user.ShoppingList[itemIndex].Amount >= 1000)
            {
                user.ShoppingList[itemIndex].Unit = "l";
                user.ShoppingList[itemIndex].Amount = user.ShoppingList[itemIndex].Amount / 1000;
            }
            else if (user.ShoppingList[itemIndex].Unit == "dl" && user.ShoppingList[itemIndex].Amount >= 10)
            {
                user.ShoppingList[itemIndex].Unit = "l";
                user.ShoppingList[itemIndex].Amount = user.ShoppingList[itemIndex].Amount / 10;
            }

            return await _dbAccess.UpdateShoppingList(user);
        }

        // Deletes an item from the shopping list if it is on the users shoppinglist
        public async Task<IActionResult> DeleteItemInShoppingList(int userId, int itemId)
        {
            var user = await _dbAccess.ReadShoppingList(userId);

            int itemIndex = user.ShoppingList.FindIndex(x => x.Id == itemId);

            user.ShoppingList.RemoveAt(itemIndex);

            return await _dbAccess.UpdateShoppingList(user);
        }

        // Adds an entire recipes ingredients to the shoppinglist
        public async Task<IActionResult> AddRecipeToShoppingList(int userId, int recipeId)
        {
            var user = await _dbAccess.ReadShoppingList(userId);
            var recipe = await _recipeDBAccess.ReadRecipe(recipeId);
            var ingredients = recipe.Ingredients;
   
            foreach (var ingredient in ingredients)
            {
                List<ShoppingList> shoppingList = user.ShoppingList;

                if (shoppingList.Any(s => s.Name == ingredient.Name))
                {
                    ShoppingList item = shoppingList.Where(s => s.Name == ingredient.Name).FirstOrDefault();
                    shoppingList.Remove(item);

                    if (item.Unit == ingredient.Unit)
                    {
                        item.Amount += ingredient.Amount;
                    }
                    else if (item.Unit == "g" && ingredient.Unit == "kg")
                    {
                        item.Amount = (item.Amount / 1000) + ingredient.Amount;
                        item.Unit = "kg";
                    }
                    else if (item.Unit == "ml" && item.Unit == "l")
                    {
                        item.Amount = (item.Amount / 1000) + ingredient.Amount;
                        item.Unit = "l";
                    }
                    else if (item.Unit == "dl" && item.Unit == "l")
                    {
                        item.Amount = (item.Amount / 10) + ingredient.Amount;
                        item.Unit = "l";
                    }

                    item.Checked = false;

                    if (item.Unit == "g" && item.Amount >= 1000)
                    {
                        item.Unit = "kg";
                        item.Amount = item.Amount / 1000;
                    }
                    else if (item.Unit == "ml" && item.Amount >= 1000)
                    {
                        item.Unit = "l";
                        item.Amount = item.Amount / 1000;
                    }
                    else if (item.Unit == "dl" && item.Amount >= 10)
                    {
                        item.Unit = "l";
                        item.Amount = item.Amount / 10;
                    }

                    user.ShoppingList.Add(item);
                }
                else
                {
                    ShoppingList newItem = new ShoppingList();
                    newItem.Name = ingredient.Name;
                    newItem.Amount = ingredient.Amount;
                    newItem.Unit = ingredient.Unit;
                    newItem.Checked = false;

                    user.ShoppingList.Add(newItem);
                }
            }

            return await _dbAccess.UpdateShoppingList(user);
        }
    }
}