using System.Collections.Frozen;
using System.Text.Json;
using LootDumpProcessor.Model.Tarkov;
using Microsoft.Extensions.Logging;

namespace LootDumpProcessor.Process
{
    public class TarkovItemsProvider : ITarkovItemsProvider
    {
        private readonly ILogger<TarkovItemsProvider> _logger;
        private readonly FrozenDictionary<string, TemplateFileItem>? _items;

        private static readonly string ItemsFilePath = Path.Combine(
            LootDumpProcessorContext.GetConfig().ServerLocation,
            "project", "assets", "database", "templates", "items.json");

        public TarkovItemsProvider(ILogger<TarkovItemsProvider> logger)
        {
            _logger = logger ?? throw new ArgumentNullException(nameof(logger));

            try
            {
                var jsonContent = File.ReadAllText(ItemsFilePath);
                _items = (JsonSerializer.Deserialize<Dictionary<string, TemplateFileItem>>(jsonContent)
                          ?? throw new InvalidOperationException()).ToFrozenDictionary();
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Failed to load server items from {ItemsPath}", ItemsFilePath);
                throw new InvalidOperationException(
                    "The server items couldn't be found or loaded. Check server config is pointing to the correct place.",
                    ex);
            }
        }

        public bool IsBaseClass(string tpl, string baseclassId)
        {
            if (_items == null)
            {
                _logger.LogError("The server items are null. Check server config is pointing to the correct place.");
                throw new InvalidOperationException(
                    "The server items couldn't be found or loaded. Check server config is pointing to the correct place.");
            }

            if (!_items.TryGetValue(tpl, out var itemTemplate))
            {
                _logger.LogError(
                    "Item template '{Tpl}' with base class id '{BaseclassId}' was not found in the server items!", tpl,
                    baseclassId);
                return false;
            }

            if (string.IsNullOrEmpty(itemTemplate.Parent))
                return false;

            return itemTemplate.Parent == baseclassId || IsBaseClass(itemTemplate.Parent, baseclassId);
        }

        public bool IsQuestItem(string tpl)
        {
            if (_items == null)
            {
                _logger.LogError("The server items are null. Check server config is pointing to the correct place.");
                throw new InvalidOperationException(
                    "The server items couldn't be found or loaded. Check server config is pointing to the correct place.");
            }

            if (!_items.TryGetValue(tpl, out var itemTemplate))
            {
                _logger.LogError("Item template '{Tpl}' was not found in the server items!", tpl);
                return false;
            }

            return itemTemplate.Props.QuestItem;
        }

        public string? MaxDurability(string tpl)
        {
            if (_items == null)
            {
                _logger.LogError("The server items are null. Check server config is pointing to the correct place.");
                throw new InvalidOperationException(
                    "The server items couldn't be found or loaded. Check server config is pointing to the correct place.");
            }

            if (!_items.TryGetValue(tpl, out var itemTemplate))
            {
                _logger.LogError("Item template '{Tpl}' was not found in the server items!", tpl);
                return null;
            }

            return itemTemplate.Props.MaxDurability?.ToString() ?? string.Empty;
        }

        public string? AmmoCaliber(string tpl)
        {
            if (_items == null)
            {
                _logger.LogError("The server items are null. Check server config is pointing to the correct place.");
                throw new InvalidOperationException(
                    "The server items couldn't be found or loaded. Check server config is pointing to the correct place.");
            }

            if (!_items.TryGetValue(tpl, out var itemTemplate))
            {
                _logger.LogError("Item template '{Tpl}' was not found in the server items!", tpl);
                return null;
            }

            return itemTemplate.Props.Caliber;
        }
    }
}