using PetCompanion.Models;
using PetCompanion.Repositories;

namespace PetCompanion.Services
{
    public class PetInventoryService
    {
        private readonly PetInventoryRepository petInventoryRepository;
        private readonly PetRepository petRepository;
        private readonly GameItemsRepository gameItemsRepository;
        private readonly GameItemService gameItemService;

        public PetInventoryService(
            PetInventoryRepository petInventoryRepository,
            PetRepository petRepository,
            GameItemsRepository gameItemsRepository,
            GameItemService gameItemService)
        {
            this.petInventoryRepository = petInventoryRepository;
            this.petRepository = petRepository;
            this.gameItemsRepository = gameItemsRepository;
            this.gameItemService = gameItemService;
        }

        public Inventory GetInventory(string petId, string userId)
        {
            var pet = petRepository.GetPetById(petId, userId);
            if (pet == null)
                throw new Exception("Pet not found");

            return petInventoryRepository.GetPetInventory(petId);
        }

        public Inventory CreateInventory(string petId)
        {
            var inventory = new Inventory
            {
                PetId = petId,
                Capacity = 20,
                Items = new List<int>()
            };

            petInventoryRepository.SavePetInventory(inventory);
            return inventory;
        }

        public Pet UseItem(string petId, string userId, int itemId)
        {
            var pet = petRepository.GetPetById(petId, userId);
            if (pet == null)
                throw new Exception("Pet not found");

            if (!pet.Inventory.Items.Any(i => i == itemId))
                throw new Exception("Item not found in inventory");

            var gameItem = gameItemsRepository.GetById(itemId);

            gameItemService.ApplyItemEffect(pet, gameItem);

            pet.Inventory.Items.Remove(itemId);

            return petRepository.UpdatePet(pet);
        }

        public Pet EquipItem(string petId, string userId, int itemId)
        {
            var pet = petRepository.GetPetById(petId, userId);
            if (pet == null)
                throw new Exception("Pet not found");

            if (!pet.Inventory.Items.Any(i => i == itemId))
                throw new Exception("Item not found in inventory");

            var gameItem = gameItemsRepository.GetById(itemId);

            if (gameItem.Type != ItemType.Equipment)
                throw new Exception("Item is not equipment");

            // If there's already an item equipped in that slot, unequip it first
            if (pet.EquippedItems.ContainsKey(gameItem.EquipTarget))
            {
                var equippedItemId = pet.EquippedItems[gameItem.EquipTarget];
                UnequipItem(petId, userId, equippedItemId);
            }

            // Apply equipment effects
            gameItemService.ApplyItemEffect(pet, gameItem);

            // Mark item as equipped
            pet.EquippedItems[gameItem.EquipTarget] = itemId;

            // Remove from inventory
            pet.Inventory.Items.Remove(itemId);

            petInventoryRepository.UpdateEquippedItems(petId, pet.EquippedItems);

            return petRepository.UpdatePet(pet);
        }

        public Pet UnequipItem(string petId, string userId, int itemId)
        {
            var pet = petRepository.GetPetById(petId, userId);
            if (pet == null)
                throw new Exception("Pet not found");

            var equipTarget = pet.EquippedItems.FirstOrDefault(kvp => kvp.Value == itemId).Key;

            if (equipTarget == ItemEquipTarget.None)
                throw new Exception("No item equipped in that slot");

            var equippedItem = gameItemsRepository.GetById(itemId);

            if (equippedItem != null)
            {
                // Remove equipment effects
                gameItemService.RemoveItemEffect(pet, equippedItem);

                // Add item back to inventory
                pet.Inventory.Items.Add(itemId);
            }

            pet.EquippedItems.Remove(equipTarget);

            return petRepository.UpdatePet(pet);
        }

        public Pet DropItem(string petId, string userId, int itemId)
        {
            var pet = petRepository.GetPetById(petId, userId);

            if (!pet.Inventory.Items.Any(i => i == itemId))
                throw new Exception("Item not found in inventory");

            var gameItem = gameItemsRepository.GetById(itemId);

            pet.Inventory.Items.Remove(itemId);

            return petRepository.UpdatePet(pet);
        }

        public Pet AddItemToPet(string petId, string userId, int itemId, int quantity)
        {
            var pet = petRepository.GetPetById(petId, userId);
            var gameItem = gameItemsRepository.GetById(itemId);

            if (gameItem == null)
                throw new Exception("Item not found");

            for (int i = 0; i < quantity; i++)
            {
                pet.Inventory.Items.Add(itemId);
            }

            return petRepository.UpdatePet(pet);
        }
    }
}